Device for Powering Electric or Electronic Devices Operatively Associated with a Circuit Breaker

Abstract

A device for powering one or more electric/electronic devices operatively associated with a low-voltage circuit breaker takes energy from a power supply line. An electronic regulator receives the energy collected as an input and delivering as an output to the electric/electronic device a power supply voltage (Vout) having a value within a preset range with respect to a reference voltage (VR). The electronic regulator includes an energy storage device chargeable by the energy collected, at the terminals of which a voltage (VCL) is established that is indicative of the power supply voltage (Vout) delivered to the electric/electronic device. A circuit enables/disables the charging of the storage device, and a feedback circuit receives a signal indicative of the voltage (VCL) at the terminals of the storage device and sends a signal to the enabling/disabling circuit to trigger the disabling or enabling of the charging process in order to keep the value of the voltage at the terminals of the storage device within a preset range. The feedback circuit enables the charging phases so as to power the storage device continuously up until the value of the voltage at their terminals comes within the preset range.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is an oscillogram illustrating the network disturbance phenomena typical of power supply devices of known type;

FIG. 2 schematically illustrates a first embodiment of the power supply device according to the invention;

FIG. 3 schematically illustrates a second embodiment of the power supply device according to the invention;

FIG. 4 schematically illustrates a safeguard device used in the power supply device according to the invention;

FIG. 5 shows an oscillogram that illustrates the drastic reduction in network disturbance phenomena (by comparison with the situation illustrated in FIG. 1) deriving from the use of the power supply device according to any embodiment of the present invention;

FIG. 6 shows various oscillograms representing some typical operating parameters for a power supply device according to the invention, on the assumption of a constant absorption by the device being powered.

Claims

1. A power supply device for powering one or more electric/electronic devices operatively associated with a low-voltage circuit breaker, comprising means for taking energy from a power supply line, electronic regulating means that receive the energy collected by said means for taking power as input and deliver as output to the electric/electronic devices a power supply voltage (Vout) having a value within a preset range with respect to a reference voltage (VR), wherein said electronic regulating means comprise: energy storage means, chargeable by means of said energy collected by said means for taking energy, the terminals of which carry a voltage (VCL) that is indicative of the power supply voltage (Vout) delivered to the electric/electronic device;a circuit for enabling/disabling the charging of the storage means;a feedback circuit that receives an input signal indicative of the voltage (VCL) at the terminals of the storage means, and that sends a command signal to the enabling/disabling circuit such that the latter disables or enables the charging process in order to keep the voltage at the terminals of the storage means within said preset range, said feedback circuit enabling the charging phase so as to power the storage means continuously up until the voltage at their terminals is within said preset range.

2. Power supply device according to claim 1, wherein said energy collected by the means for taking energy is delivered to said electronic regulating means in the form of a current and said charging of the storage means is achieved continuously by means of a choking of the waveform of said current input to the electronic regulating means.

3. Power supply device according to claim 2, wherein said charging of said storage means is achieved according to a nonlinear feedback regulating mode.

4. Power supply device according to claim 3, wherein said charging of said storage means is achieved according to a switching feedback regulating mode.

5. Power supply device according to claim 1, wherein said electronic regulating means comprise protection means suitable for taking action in the event of the occurrence of anomalous operating conditions.

6. Power supply device according to claim 1, wherein said feedback circuit comprises means of comparison that receive as input a signal indicative of the difference (□) between the value of the reference voltage (VR) and a value indicative of the voltage (VCL) at the terminals of the storage means, and that send a corresponding enabling/disabling command signal to said enabling/disabling circuit.

7. Power supply device according to claim 6, wherein said feedback circuit comprises adding means that receive as input a signal indicative of the voltage (VCL) at the terminals of the storage means and a signal indicative of the reference voltage (VR), and that send said signal indicative of the difference between them (□) as output to said means of comparison.

8. Power supply device according to claim 7, wherein said feedback circuit comprises a low pass filter that receives said signal indicative of the voltage (VCL) at the terminals of the storage means as input and purges of any harmonics, and sampling and holding means that sample and record the signal received from the low pass filter and send it to said adding means.

9. Power supply device according to claim 1, wherein said enabling/disabling circuit comprises at least one semiconductor electronic device.

10. Power supply device according to claim 9, wherein said at least one semiconductor electronic device is connected in parallel to said energy storage means.

11. Power supply device according to claim 9, wherein said at least one semiconductor electronic device is connected in series to said energy storage means.

12. Power supply device according to claim 1, comprising at least one resistor (Rsense) installed in series, through which the current circulating in said electric line passes.

13. Power supply device according to claim 5, wherein said protection means comprise at least one resistor (Rsense) for coupling operatively with the power supply line so that a current indicative of the current circulating therein passes through the resistor and a signal indicative of the voltage thus established at the terminals of said resistor (Rsense) is delivered directly to said feedback circuit.

14. Power supply device according to claim 5, wherein said protection means comprise at least one resistor (Rsense) for coupling operatively with the power supply line so that a current indicative of the current circulating therein passes through the resistor; and a circuit safeguard device that receives a signal indicative of the voltage at the terminals of said resistor as input and sends a corresponding conditioned and/or uncoupled signal to said feedback circuit that is indicative of the current circulating in said power supply line, said feedback circuit then sending a disabling signal to said enabling/disabling circuit whenever the value of said signal it receives (which is indicative of the current circulating in the power supply line) exceeds a preset threshold.

15. Power supply device according to claim 5, wherein said protection means comprise at least one resistor (Rsense) for coupling operatively with said power supply line, at the terminals of which a voltage is established that is indicative of the phase voltage of the power supply line; and a circuit safeguard device that receives a signal indicative of the voltage at the resistor's terminals and sends to said feedback circuit a corresponding conditioned and/or uncoupled signal indicative of the phase voltage of the power supply line, wherein said feedback circuit sends a disabling signal to said enabling/disabling circuit if the value of said signal indicative of the phase voltage of the power supply line exceeds a preset threshold.

16. Power supply device according to claim 5, wherein said protection means comprise limiting means for cutting off the voltage to the terminals of the storage means whenever it exceeds a preset safety threshold.

17. Power supply device according to claim 1, wherein said electronic regulating means comprise a first diode installed upstream from the storage means to prevent them from being discharged upstream, and a second diode installed downstream from said storage means to prevent energy backflows from the electric/electronic device(s).

18. Low-voltage circuit breaker comprising a power supply device according to claim 1.

19. Low-voltage AC/DC electric system comprising a power supply device according to claim 1.