The invention relates to an apparatus for radiating an object with UV radiation, and to a tanning apparatus.
WO 2005/034165 discloses a tanning apparatus for radiation treatment for personal care. The tanning apparatus comprises at least one gas discharge UV (Ultra Violet) lamp, at least one ballast connected in series with said at least one gas discharge lamp, and at least one incandescent lamp separate from the gas discharge lamp or lamps. The weight of the inductive ballast is reduced in that the incandescent lamp or lamps is or are included in the ballast or ballasts.
This tanning apparatus has the drawback over fully inductive ballasts that the harmonic distortion of the current drawn from the mains is relatively high.
It is an object of the invention to decrease the harmonic distortion of the current drawn from the mains in an apparatus in which a resistive ballast is arranged in series with the UV lamp.
A first aspect of the invention provides an apparatus as claimed in claim 1. A second aspect of the invention provides a tanning apparatus as claimed in claim 22. Advantageous embodiments are defined in the dependent claims.
In the now following with the ignition voltage of the lamp is meant the voltage required to ignite a cold lamp. The re-ignition voltage is the voltage required to re-ignite the lamp during use such that the lamp becomes conductive again. With arc voltage is meant the voltage across the lamp after the lamp has been re-ignited. The re-ignition voltage strongly depends on the temperature of the ionized gas in the lamp. If a resistive ballast is used and current gaps occur, the re-ignition voltage will be higher than if an inductive ballast is used because the temperature of the gas drops. The re-ignition voltage operated with an inductive ballast on 50 or 60 Hertz is about 1.5 times higher than the arc voltage.
In accordance with the first aspect of the invention, the apparatus comprises a series arrangement of a resistive ballast and a gas discharge UV lamp. The series arrangement of the gas discharge UV lamp and its resistive ballast is arranged to receive an AC (Alternating Current) power source voltage supplied by an AC power source. The low frequency (LF) current supplied by the AC power source is referred to as the power source current. The resistive ballast may be a filament of an incandescent lamp. In a tanning apparatus, preferably, the incandescent lamp is an IR (Infra Red) lamp which produces at least infrared light. Such an IR lamp has the advantage that it heats the person, which is radiated by the UV light of the gas discharge UV lamp (further also referred to as UV lamp).
Besides the LF current supplied by power source, a high frequency (HF) generator generates a HF current through the UV lamp. The HF current is at least supplied during periods in time the AC voltage generated by the AC power source has a level lower than a re-ignition voltage of the UV lamp. An amplitude and/or frequency of the generator current is selected to keep the gas discharge UV lamp at least ionized. Keeping the UV lamp ionized around zero crossings of the AC voltage has the advantages that the re-ignition of the UV lamp occurs at lower levels of the AC voltage. Consequently, the time periods around the zero crossings of the AC voltage during which no current flows through the UV lamp (these time periods are also referred to as the zero current gaps or just current gaps) become shorter, and the harmonic distortion of the current drawn out of the AC power source decreases. This might be a very important issue because usually the AC power source is the mains, and the amount of harmonic distortion allowed on the mains is strictly regulated.
It has to be noted that without the HF generator, no current at all is flowing through the UV lamp once the voltage across it drops below a predetermined level. This behavior is due to the resistive ballast, for example formed by the incandescent lamp and is quite different from what happens with the usual inductive ballast. With an inductive ballast the phase difference between the AC voltage generated by the AC power source and the voltage across the UV lamp still causes a current through the lamp when the AC voltage is lower than the re-ignition voltage. This phase difference also causes that the voltage across the UV lamp is higher than the re-ignition voltage when the current is zero. Thus, in the present invention wherein an incandescent lamp is used as the ballast (or forms a major part of the ballast) current gaps occur which are not know from the prior art systems which use an inductive ballast. It has been found that during the period in time the generator current is supplied to the UV lamp, the impedance of the UV lamp allows a relatively small current from the AC power source to flow through the UV lamp. This even further decreases the amount of harmonics in the current drawn from the AC power source.
U.S. Pat. No. 4,378,513, U.S. Pat. No. 4,484,107 and EP 0 063 168 all disclose a discharge lamp with an inductive ballast arranged in series.
U.S. Pat. No. 4,378,513 discloses that zero current gaps occur when in an inductive ballast system, which is used to ballast a low-pressure discharge fluorescent lamp, a resonant igniter is used. To ballast a high-pressure discharge lamp, a pulse generator is connected in parallel to the discharge the lamp. The pulse generator impresses re-ignition pulses on the discharge (lamp) tube at least during a period defined as from a zero-cross point of the AC power source voltage to a phase defined by a peak of the re-ignition voltage of the lamp. Now, the zero current gaps, which are due to the prior art resonant re-igniter, are prevented. Although U.S. Pat. No. 4,378,513 discloses that a current limiting device such as a choke coil is connected in series with the discharge tube, no other current limiting devices are disclosed than an inductive ballast. Particularly, the problem is solved of a prior art with an inductive ballast in which zero current gaps occur due to the resonant igniter.
U.S. Pat. No. 4,484,107 discloses that in a lighting system with an inductive ballast in series with a discharge lamp, the ballast choke can be reduced if the lamp voltage is increased. However due to the high lamp voltage, zero current gaps occur. Besides a low frequency (LF) current supplied by the AC main source, a HF source produces a HF current through the discharge lamp to re-ignite the lamp at the initial part in each half cycle of the AC main source to keep the lamp continuously lit.
EP 0 063 168 discloses a high pressure discharge lamp apparatus in which a discharge tube, a current limiting device which is an inductive ballast, and a triac are arranged in series to receive an AC power source voltage. A firing angle of the triac is controlled in response to a current detection circuit which detects a change of the current through the lamp, to limit the current. During the off periods of the triac, the AC power source is disconnected from the lamp. Further, the lamp voltage is selected very close to the AC power source voltage. A pulse generator supplies re-ignition pulses to the discharge tube during a period from near the zero cross point of the AC power source voltage to minimize the zero current gaps.
Thus, all these prior arts are directed to solving a problem in a system with an inductive ballast, which problem is not caused by a resistive ballast. Further, these prior arts do not hint towards the problem with a resistive ballast, the skilled person does not expect to find a solution for zero current gaps caused by a resistive ballast in series with the UV lamp in these prior arts which do not have a resistive ballast and consequently solve problems related to inductive ballasts.
In an embodiment as claimed in claim 2, the HF generator generates the generator current with a repetition frequency higher than a frequency of the AC power source current. Preferably, the repetition frequency of the generator current is within the range from 50 kHz to 150 kHz, while the AC power source is the mains which usually supplies a sinusoidal voltage with a frequency of either 50 Hz or 60 Hz.
In an embodiment as claimed in claim 4, the apparatus further comprises a first impedance arranged between the AC power source and the incandescent lamp, and a second impedance arranged between the HF generator and UV lamp. The first impedance attenuates an amount of (preferably: blocks) the generator current flowing through the incandescent lamp to the AC power source. The second impedance attenuates an amount of (preferably: blocks) the AC power source current flowing through the HF generator. Preferably, the first impedance comprises or is a first inductor, and the second impedance comprises or is a first capacitor.
In an embodiment as claimed in claim 6, a second capacitor is arranged in parallel with the UV lamp and a second inductor is arranged in series with the first capacitor. A first resonance frequency of the first capacitor and the second inductor is selected to be lower than a minimal value of the repetition frequency of the generator current. A second resonance frequency of the second capacitor and the second inductor is selected to be higher than the first resonance frequency. The controller controls the HF generator to vary the repetition frequency of the HF generator starting from a value higher than the second resonance frequency to the minimal value. By varying the repetition frequency from above the second resonance frequency to below the second resonance frequency, at the second resonance frequency the voltage across the UV lamp becomes higher than the ignition voltage and the UV lamp is ignited. Once the UV lamp has been ignited the voltage across the UV lamp should be decreased. This is obtained by decreasing the repetition frequency below the second resonance frequency. The repetition frequency should not drop below the first resonance frequency to prevent the series arrangement to leave its inductive mode.
In an embodiment as claimed in claim 7, the generator current is only supplied during periods in time that the current through the UV lamp would be zero if no HF generator is used. This improves the efficiency of the HF generator.
In an embodiment as claimed in claim 8, the HF generator starts supplying the generator current before the power source voltage reaches its zero value, and stops supplying the generator current after the power source voltage passes its zero value. Thus, the HF generator supplies the generator current during a period in time around the zero crossing of the power source voltage. For example, the duration of this period in time is approximately 4 ms, and the generator current is started approximately 2 ms before the zero crossing of the power source voltage. This early start of the generator current is typical for systems in which a resistive ballast is used and is not found in systems in which a inductive ballast is used.
In an embodiment as claimed in claim 11, the apparatus further comprises a controllable switching element which is arranged for obtaining a lamp current through the incandescent lamp to preheat the incandescent lamp before igniting the UV lamp. Thus, the controllable switching element is arranged such that, during start up phase, the AC power source supplies a current through the incandescent lamp and not through the UV lamp. The current through the incandescent lamp heats the filament of the incandescent lamp. When the filament is heated sufficiently, its resistance is relatively high with respect to its resistance when cold, and the UV lamp can be ignited without causing a very high inrush current. Because now, the relatively high resistance of the heated incandescent lamp limits the start up current in the UV lamp, the commonly known NTC (Negative Temperature Coefficient) resistor in series with the ballast to limit the start-up current is not required. It has to be noted that the already present incandescent lamp, which is part of or which forms the ballast for the UV lamp, is thus also used to limit the start up current in the UV lamp.
In an embodiment as claimed in claim 12, after the incandescent lamp has been pre-heated, an igniter generates an ignition voltage across the UV lamp to ignite the UV lamp. Such an igniter as such is well known. The igniter may be arranged in series or in parallel with the UV lamp. The igniter may generate the ignition voltage across the terminals of the UV lamp through which the current flows, or may use a separate electrode of the UV lamp.
In an embodiment as claimed in claim 13, the apparatus comprises a controller which controls the controllable switching element to obtain the lamp current through the UV lamp. The controller provides a level to a control input of the controllable switching element such that the controllable switching element forms a current loop from the AC current source through the incandescent lamp during the pre-heating phase wherein the incandescent lamp is pre-heated. The controller switches off the controllable switching element once the incandescent lamp is sufficiently pre-heated. Now the UV lamp can be ignited. The incandescent lamp is sufficiently pre-heated once its impedance is sufficiently high to ignite the UV lamp with a limited start up current from the AC voltage source through the series arrangement of the incandescent lamp and the UV lamp. The ignition of the UV lamp may be automatically because the switch off of the controllable switch causes a voltage rise across the UV lamp. Alternatively, the ignition of the UV lamp may be controlled by the controller by activating the igniter.
In an embodiment as claimed in claim 14, the controller controls the switching element to obtain a lamp current through the incandescent lamp which increases in time. This prevents the low impedance of the incandescent lamp when cold to cause a relatively high current to be drawn from the AC power source. Many possibilities exist to control the switching element such that the current increases in time. For example, the switching element may be closed with a fixed repetition frequency while its on-time is increasing in time.
In an embodiment as claimed in claim 15, the apparatus has a first input terminal and a second input terminal for receiving the current from the power source. The series arrangement is coupled between the first input terminal and the second input terminal. The switching element when conductive couples the incandescent lamp between the first input terminal and the second input terminal and forms thereby a short circuit for a voltage supplied across the UV lamp. Thus, as long as the switching element is conductive the lamp current is flowing through the incandescent lamp, and no current flows through the UV lamp because the voltage across the UV lamp is zero. At the instant the filament of the incandescent lamp is sufficiently heated, the switching element is controlled to become non-conductive. Now, the voltage at the junction of the incandescent lamp and the UV lamp rises and may ignite the UV lamp. Once the UV lamp is ignited, the current from the AC power source flows through the series arrangement of the incandescent lamp and the UV lamp. Alternatively, a separately controlled igniter may be used to ignite the UV lamp once the switching element has become non-conductive.
In an embodiment as claimed in claim 16, the apparatus further comprises a failure detector which detects a failure in the apparatus. The controller activates the switching element to form a short-circuit for the voltage across the gas discharge UV lamp. Now, the AC power source only supplies the lamp current to the incandescent lamp. Failure detectors in apparatus which generate UV radiation are as such well known. For example, the failure detector detects a sticking of contacts of an on-off switch of the apparatus which is arranged in series with the series arrangement of the incandescent lamp and the UV lamp.
In an embodiment as claimed in claim 18, the failure detector tests whether the controller is operating correctly. If not, a relay is activated to disconnect the apparatus from the AC power source. For example, the failure detector tests whether the controller is generating a predefined pulse and if not, the relay is activated to disconnect the apparatus from the AC power supply.
In an embodiment as claimed in claim 20, the controllable switching element comprises or is a triac which has the advantage that it can conduct current in two directions.
The apparatus for radiating an object with UV-radiation may be used as a tanning apparatus for radiating a person with UV-radiation.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings:
It should be noted that items which have the same reference numbers in different Figures, have the same structural features and the same functions, or are the same signals. Where the function and/or structure of such an item has been explained, there is no necessity for repeated explanation thereof in the detailed description.
Although the embodiments discussed in the detailed description of the Figures are directed to a tanning apparatus, the invention also covers other apparatus which have a UV lamp to radiate an object with UV radiation. The object may be a person, an animal, or a non-living object or material.
A controller CO controls the switch T1. The controller CO supervises whether the UV lamp LA2 should be switched on. For example, the controller CO detects the closing of the on-off switch SO or of any other user button indicating that the UV lamp LA2 should be switched on. Alternatively, the controller CO may detect whether the power supply voltage VM is present behind the on/off switch SO, for example, at the junction of the on/off switch SO and the IR lamp LA1. Then, the controller CO closes the switch T1 to first heat the IR lamp LA1. Once the IR lamp LA1 is heated and its resistance is relatively high, the switch TI is opened and the UV lamp LA2 is ignited. The use of the switch TI and the pre-heating of the IR lamp LA1 are optional.
It has to be noted that during normal operation the series arrangement of the IR lamp LA1, the impedance Z1, and the UV lamp LA2 receives the mains voltage VM. The impedance Z1 has a relatively low value for the mains frequency current IP which now is identical to the current ILA2 through the UV lamp LA2. Because the filament of the IR lamp LA1 behaves as a resistive ballast, the mains current IP drawn by the UV lamp LA2 has a non-sinusoidal wave shape. The current ILA2 through the UV lamp LA2 and thus the current IP from the mains is zero around the zero crossings of the mains voltage VM because the mains voltage VM has a level which is too low to keep the UV lamp LA2 ionized. For example, a UV lamp may have an arc voltage ranging from 100V to 140V dependent on the type of lamp used. Consequently, every half mains period of the mains voltage VM, the voltage across the UV lamp LA2 becomes too low to keep the current ILA2 flowing through the UV lamp LA2 and the UV lamp LA2 extinguishes. These gaps in the lamp current ILA2 and thus in the mains current IP, cause a high amount of mains pollution on the mains.
Theoretically, the UV lamp LA2 re-ignites as soon as the momentary voltage across it rises above its arc voltage. However, during the period in time that no current ILA2 flows through the UV lamp LA2, the momentary dissipation in the UV lamp LA2 is zero and the temperature of the plasma inside the UV lamp LA2 rapidly decreases and the UV lamp LA2 de-ionizes. The de-ionization of the UV lamp LA2 results in a decreased conductivity of the lamp. The re-ignition of a (partly) de-ionized UV lamp LA2 is much more difficult and requires a higher voltage. It has been found that a particular UV lamp required a mains voltage of higher than 200V instead of 140V to re-ignite. The result is a non-sinusoidal mains current IP with a high harmonic content. The maximum levels of harmonic currents that are allowed to be drawn from the mains socket by household appliances are prescribed in IEC 61000-3-2 (Class C).
It has to be noted that UV lamps driven by an inductive ballast do not have problems with discontinuous, non-sinusoidal, mains currents and high harmonic content. In such systems, the lamp current ILA2 is about 45° lagging with respect to the mains voltage VM. The lamp current ILA2 and the lamp voltage are of course in phase. At the instant the lamp current ILA2 passes zero, the momentary mains voltage is about 250V (325V*sin (45°)). This re-ignition voltage is much higher than the lamp arc voltage. The UV lamp LA2 almost immediately re-ignites after the zero crossing of the UV lamp LA2 current. Consequently, the period during which the lamp current ILA2 is zero is very short, for example, about 0.1 ms.
The high harmonic content in the mains current IP when using a resistive ballast is decreased by using an auxiliary high frequency (HF) power source OSC. The HF power source OSC generates a HF current IOSC through the UV lamp LA2 to keep the UV lamp LA2 ionized nearby (around) the zero crossings of the mains voltage VM when the voltage across the UV lamp LA2 is lower than its arc voltage. Now, the UV lamp LA2 is still ionized when the absolute value of the momentary mains voltage VM starts increasing, and the UV lamp LA2 is ignited earlier thereby shortening the zero current gap. Consequently, the harmonic content in the mains current IP decreases.
The current ILA2 through the UV lamp LA2 comprises a low frequency (LF) part IP supplied by the mains power source PS and a HF part IOSC supplied by the HF power source OSC. The mains current IP is larger than the HF current IOSC. The mains current IP is stabilized by the resistive ballast which is the IR lamp LA1. Preferably, the impedances Z1 and Z2 are added to create two separate LF and HF current paths. The inductive impedance Z1 prevents the HF current IOSC to flow through the IR lamp LA1 and the mains. The capacitive impedance Z2 prevents the LF current IP to flow into the HF source OSC. Preferably, the impedance Z1 is an inductor and the impedance Z2 is a capacitor, but more complex circuits having the desired effect can be used.
The HF source OSC may operate intermittently. If the momentary mains voltage VM becomes lower than the arc voltage of the UV lamp LA2, the mains PS no longer supplies power to the UV lamp LA2 and the HF source OSC is switched on. The HF source OSC supplies HF power to the UV lamp LA2 until the momentary mains voltage VM has a level sufficiently high to again supply LF power from the mains PS to the UV lamp LA2. Now, the HF source OSC is switched off For example, the total operation time of the HF source OSC is approximately 4 ms, it is switched on approximately 2 ms before the zero crossing of the mains voltage VM and it is switched off approximately 2 ms after the zero crossing of the mains voltage VM, see
Tests with a prototype of the apparatus, which comprises the resistive ballast (the IR lamp LA1) and the HF power source OSC, show that the resistive part of the ballast supplies extra current nearby the zero crossings of the mains voltage VM if the HF power source OSC is active. From a theoretical point of view this is a quite unexpected behavior. Theoretically, the resistively operated UV lamp LA2 requires a mains voltage VM which has a level higher than the arc voltage of the UV lamp LA2 before current ILA2 can flow through the UV lamp LA2. The unexpected supply of current IP from the means PS is caused by the fact that the HF power source OSC has an open voltage which is higher than the arc voltage of the UV lamp LA2. Thus, the HF power source OSC keeps the UV lamp LA2 ionized. The increased ionization level of the UV lamp LA2 around the zero crossing of the mains voltage VM results in an increased conductivity (lower resistance) of the UV lamp LA2. This decreased resistance allows the mains power source PS to supply LF current IP to the UV lamp LA2 during a period in time that otherwise no mains current IP can be supplied because the momentary mains voltage VM is lower than the arc voltage. This LF current IP during the zero current gaps further decreases the harmonic distortion of the mains current IP.
It further appeared that the ratio between the power in the IR lamp LA1 and the power in the UV lamp LA2 can be decreased by adding the HF power source OSC. For example in a practical implementation, with an inactive HF power source OSC, if the arc voltage of the UV lamp LA2 is about 110 V, a total power of 700 W is consumed, 400 W in the IR lamp LA1 and 300 W in the UV lamp LA2. Thus, the ratio of UV power and IR power is 1:1.33. It is now assumed that in the same system the HF power source OSC is activated, at least during the zero current gaps. The HF power source OSC supplies 30 W to the UV lamp LA2, and via the IR lamp LA1 370 W is supplied to the UV lamp LA2. The power in the UV lamp LA2 thus becomes 400 W and the power in the IR lamp LA1 becomes 430 W. Consequently, the ratio of UV power and IR power changes into the more favorable 1:1.08.
The power ratio can even be more improved if an UV lamp LA2 with a higher arc voltage is used. However, if such an UV lamp LA2 is used together with a resistive ballast (the IR lamp LA1) only, the UV lamp LA2 will be poorly stabilized and the harmonic distortion of the lamp current ILA2 will further increase. But, if on top the resistive ballast also the HF power source OSC is implemented these drawbacks can be minimized by activating the HF power source OSC during at least the zero current gaps of the mains current IP. Now, even an arc voltage of the UV lamp LA2 is possible which is otherwise impractical. For example if the arc voltage is changed into 140 V instead of 110 V, the power ratio can be improved to 1:0.65.
The amount of HF current supplied by the HF power source OSC during the zero current gaps may be controlled to minimize the harmonic content of the mains current IP. This will be elucidated in more detail with respect to
The intermittent operation of the HF generator OSC has two advantages. Firstly, a continuously active HF power source OSC easily excites acoustic resonances in the UV lamp LA2. These resonances are minimized or even prevented by only switching on the HF power source OSC during short periods in time. Secondly, it appeared that if a HF current IOSC is superimposed on the LF current IP outside the zero current gaps, the HF power source OSC only supplies reactive power the UV lamp LA2.
The HF power source OSC has a controllable frequency, for example in the range from 100 kHz to 150 kHz. The inductor L2 is added because usually the HF power source OSC is a voltage source and the UV lamp LA2 must be current driven. The resonance frequency of the capacitor C1 and the inductor L2 is selected lower than the lowest frequency of the HF power source OSC such that the series arrangement of the capacitor C1 and the inductor L2 indeed always act as an inductance over the complete frequency range. For example, the resonance frequency of the capacitor C1 and the inductor L2 is selected to be 80 kHz.
The resonance frequency of the capacitor C2 and the inductor L2 is selected to be higher than the lowest frequency of the HF power source OSC, for example, this resonance frequency is selected to be about 120 to 130 kHz. If the HF power source OSC has this frequency, the voltage supplied by the HF power source OSC is boosted and the UV-lamp LA2 is ignited. A separate series starter is now not required. Dependent on the UV-lamp LA2 used, the required ignition voltage may be about 2.5 kV. In a practical implementation, the frequency of the HF power source OSC sweeps from a value (in this example 150 kHz) above the resonance frequency of the capacitor C2 and the inductor L2 via the resonance frequency of the capacitor C2 and the inductor L2 (in this example 130 kHz) to its lowest frequency (in this example 100 kHz). The lowest frequency is higher than the resonance frequency of the capacitor CI and the inductor L2 (in this example 80 kHz). This frequency sweep of the HF power source OSC ensures that the UV lamp LA2 is ignited (at about the resonance frequency of the capacitor C2 and the inductor L2) and has an inductive element in series with it when the UV lamp LA2 is in normal operation at the lowest frequency of the HF power source OSC.
Now, the operation of the circuit shown in
If the UV lamp LA2 is ignited without first pre-heating the IR lamp LA1, very high inrush current peaks (up to 80 A per UV lamp) are drawn from the mains PS. If the pre-heat process is performed within 10 seconds, no problems arise with IEC regulations because these prescribe to measure the harmonic currents drawn from the mains 10 seconds after power on.
The position of the triac T1 as shown in
The controllable switching element T1, which in the embodiment shown is a triac, is arranged to obtain a current ILA1 through the IR lamp LA1 while preventing current to flow through the UV lamp LA2. The UV lamp LA2 is ignited after the IR lamp LA1 is sufficiently preheated such that its impedance, which is predominantly resistive, is sufficiently high to limit a start up current through the UV lamp LA2. The pre-heating of the IR lamp LA1 before starting the UV lamp LA2 enables to omit the commonly known NTC resistor in the series arrangement. The operation of the tanning apparatus shown in
In the embodiment shown in
The controller CO further may have inputs for receiving failure information. The failure detector FD1 detects whether a contact of the on-off switch SO sticks and indicates this misbehavior to the associated input of the controller CO. The controller CO than activates the triac T1 which short-circuits the voltage at the node N1 and thus causes the voltage across the UV lamp LA2 to drop to zero such that the UV lamp LA2 is switched off and it is prohibited that the person will be radiated too long with UV radiation.
Another failure occurs when the controller CO stops functioning correctly. To detect this failure, the controller CO has an output RD to supply a pulse signal RP to a capacitor C10. The failure detector FD2 checks whether the pulse signal RP is still present, and if not, it is clear that the controller CO stopped functioning correctly and a relay RE is activated to disconnect the apparatus, or at least the UV lamp LA2, from the mains PS.
At the instant t1, when the tanning apparatus is switched on by closing the on-off switch SO, the controller CO detects the mains voltage VM at its input UM and controls the triac T1 to become conductive. Consequently the current ILA1 starts flowing through the IR lamp LA1. On the other hand the triac T1 short-circuits the voltage at the node N1. Consequently, the voltage VLA2 across the UV lamp LA2 is low because the igniter IG is inactive, and thus no current ILA2 flows through the UV lamp LA2. In
At the instant t2, the IR lamp LA1 is sufficiently heated and its resistance is sufficiently high to limit the inrush current of the yet cold UV lamp LA2. Now the UV lamp LA2 can be ignited. The ignition pulse or pulses last from the instant t2 to t3 as shown in
At the instant t3, the UV lamp LA2 is ignited, the ignition pulse(s) VGI stop and the current ILA1 is now the current which flows through the series arrangement of the IR lamp LA1 and the UV lamp LA2. Or said differently, the currents ILA1 and ILA2 are identical.
At the instant t4, the user presses the optional button B1 to indicate that the UV lamp LA2 should be switched off. The controller CO controls the triac T1 to become conductive, the voltage supplied to the UV lamp LA2 is short-circuited and the UV lamp LA2 switches off. The IR lamp LA1 is now connected between the terminals TE1 and TE2 and thus receives the power supply voltage VM. However the continuous on state of the IR lamp LA1 cannot harm the person.
If the failure detector FD1 detects that a contact of the switch SO is sticking this is forwarded to the controller CO which again controls the triac T1 to become conductive thereby switching off the UV lamp LA2 as discussed hereinabove.
The HF generator OSC comprises a driver stage IC2 and a half bridge output stage formed by controllable switches S1 and S2. The driver stage IC2 receives an input signal FS which controls the frequency sweep of the HF generator OSC, and a switch signal HFOO which indicates when the HF generator OSC should be active and when not. The junction of the controllable switches S1 an S2, which are shown to be MOSFETs, is connected to the node N3 via the series arrangement of the capacitor C1 and the inductor L2. When the HF generator OSC is active, square pulse are generated at the junction of the controllable switches S1 an S2. A rectifier DB, which, by way of example, is shown to be a full bridge, rectifies the mains voltage present between the node N1 and the terminal TE2 if the on/of switch SO is closed. The rectified mains voltage is supplied between the nodes N4 and N5. The node N5 is connected to the terminal TE2 by the coupling capacitor CC. An optional power factor converter PFC supplies the rectified mains voltage to a buffer capacitor CB which supplies the power supply voltage of the HF generator OSC. The power factor converter PFC comprises a series arrangement of an inductor L3 and a rectifier D3 arranged between the node N4 and a terminal of the buffer capacitor CB. A series arrangement of a switch S3 and a sense resistor RSE is connected between the node N5 and on the other hand the junction of the inductor L3 and the rectifier D3. The driver IC1 controls the on and off periods of the switch S3 in response to the feedback voltage across the sense resistor RSE and a control signal PCFM generated by the controller CO. The operation of the power factor converter PFC is not further elucidated because such a power factor converter PFC is well known to the skilled person.
The controller CO has an input ZX to receive the voltage at the node N2. The controller CO detects at its input ZX whether the on/off switch SO is moved into the on-position. The controller supplies the signals PH, PCFM, FS, and HFOO. The signal PH controls the on/off state of the triac T1, and the signal PCFM controls the operation of the power factor converter PFC. The power factor converter PFC removes the high frequency power supply current drawn by the HF generator OSC from the current IMHF which is drawn from the mains via the on/off switch SO. This decreases a harmonic content of the current IMHF.
After detection of the closing of the on/off switch SO, the controller CO switches on the triac T1, preferably with an increasing conduction angle, to pre-heat the IR lamp LA1. Once the IR lamp LA1 is sufficiently pre-heated, the triac T1 is switched off. The frequency of the HF source OSC starts decreasing from its maximum frequency and at the resonance frequency of the capacitor C2 and the inductor L2 the UV lamp LA2 is ignited. The frequency of the HF source OSC is further lowered to stop the ignition phase and to enter the normal operation mode wherein the HF source OSC intermittently supplies power to the UV lamp LA2 during the zero current gaps which occur if the HF source OSC would not be present.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.
For example, although the embodiment described in the detailed description of the Figures are directed to a tanning apparatus, any apparatus which has to generate UV radiation suitable to radiate a person and having another effect in mind than tanning is covered by the present invention.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb “comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Number | Date | Country | Kind |
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06101368.6 | Feb 2006 | EP | regional |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/IB07/50335 | 2/1/2007 | WO | 00 | 8/5/2008 |