Patent Application
20250040012
The present application claims the benefit of Chinese Patent Application No. 202310933338.1 filed on Jul. 27, 2023, the contents of which are incorporated herein by reference in their entirety.
The present invention relates to the field of electronic circuit technology, particularly to a power control circuit and a dimming control circuit.
In the current market, existing solutions for adjusting power and color temperature basically adjust the driver's output power by utilizing the resistance in the driver's three-in-one dimming interface, which involves 0-10V dimmer dimming, PWM dimming, and adjustable resistance dimming. However, the drawback of these solutions is that the internal impedance of dimming interfaces varies among different power supplies, requiring different resistance to achieve the same power output. This results in a high degree of customization for lighting manufacturers and a lack of standardization.
The present invention provides a power control circuit and a dimming control circuit to solve the technical problem of power matching for different types of dimming interfaces, which is challenging to achieve in the existing technology.
To solve the aforementioned technical problem, an embodiment of the present invention provides a power control circuit, comprising: a power supply voltage stabilizing circuit, a power adjusting circuit, and an output circuit; the power adjusting circuit comprises: a voltage division resistor;
The present invention first utilizes the power supply voltage stabilizing circuit to converts the power supply voltage into the input voltage required for controlling the LED light; then adjusts the voltage division ratio of the voltage division resistor in the power adjusting circuit to achieve power adjustment of the output voltage; so as to ensure that the brightness control voltage obtained after operationally amplifying and following the output voltage can satisfy the power match for different dimming interfaces.
Furthermore, the power adjusting circuit comprises: a level control module; wherein the voltage division resistor comprises: a first resistor and a second resistor;
The present invention parallelly connects different external resistors to the second resistor through different levels, so as to achieve the adjustment of voltage division ratio of the voltage division resistor, thereby enabling the output voltage to have different powers to satisfy the power match for different dimming interfaces.
Furthermore, the level control module comprises: a plurality of external resistor branches and a power DIP switch; wherein the external resistor branch comprises: a first external resistor and a second external resistor; the second external resistor is an adjustable resistor;
The present invention achieves the adjustment of voltage division ratio by parallelly connecting external resistor branches to the second resistor, wherein the external resistor branch includes the first external resistor and the second external resistor, and by adjusting the resistance value of the adjustable second external resistor, further power adjustment of the output voltage can be achieved, thereby satisfying the power matching for different dimming interfaces.
Furthermore, the power supply voltage stabilizing circuit comprises: a first voltage stabilizing circuit and a second voltage stabilizing circuit; wherein the second voltage stabilizing circuit comprises: a first switching tube, a third resistor, and an expansion circuit;
The present invention adjusts and controls the voltage at the control end of the first switching tube through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into the reference voltage, the expansion circuit determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Furthermore, the expansion circuit comprises: a first diode, a second diode, and an external sensor module;
The present invention adjusts and controls the voltage at the control end of the first switching tube through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into the reference voltage, the external sensor module, in combination with the first diode clamp, determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Furthermore, the expansion circuit comprises: a third diode, a fourth diode, and a light controller module;
The present invention adjusts and controls the voltage at the control end of the first switching tube through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into the reference voltage, the light controller module, in combination with the third diode clamp, determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Furthermore, the first voltage stabilizing circuit comprises: a first capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a second switching tube, and a first thyristor;
In the present invention, after receiving the power supply voltage, the first voltage stabilizing circuit first performs filtering through the first capacitor to enhance the stability of circuit operation; then divides the voltage by the fifth resistor and the sixth resistor to provide the preset reference voltage to the gate of the thyristor, and in conjunction with the second switching tube, converts the power supply voltage into the reference voltage of the preset voltage value, so as to achieve the stabilized voltage output; and the fourth resistor prevents excessive current of the second switching tube, further enhancing the stability of circuit operation.
Furthermore, the first voltage stabilizing circuit further comprises: a second capacitor and a third capacitor;
The present invention further uses the second capacitor and the third capacitor to respectively achieve the low-pass filtering between the second end and the control end of the second switching tube and the filtering at the output end of the first voltage stabilizing circuit, thereby enhancing the quality of the reference voltage.
Furthermore, the output circuit comprises: a first operational amplifier, a seventh resistor, and a fifth diode;
In this invention, the first operational amplifier follows the output voltage through a feedback loop provided by the seventh resistor, and in conjunction with the fifth diode, outputs the brightness control voltage required for the dimming interface.
In another aspect, the embodiments of the present invention further provide a dimming control circuit comprising: a power control circuit as described in the embodiments of the present invention and a color temperature adjusting circuit; wherein the color temperature adjusting circuit comprises: an LED driver module, a cool white LED array, a warm white LED array, and a color temperature DIP switch;
The present invention first utilizes the power supply voltage stabilizing circuit to converts the power supply voltage into the input voltage required for controlling the LED light; then adjusts the voltage division ratio of the voltage division resistor in the power adjusting circuit to achieve power adjustment of the output voltage; so as to ensure that the brightness control voltage obtained after operationally amplifying and following the output voltage can satisfy the power match for different dimming interfaces.
Now with reference to the drawings in the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be described clearly and comprehensively. It is evident that the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, any other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present invention.
Please refer to
The present embodiment first utilizes the power supply voltage stabilizing circuit to converts the power supply voltage into the input voltage required for controlling the LED light; then adjusts the voltage division ratio of the voltage division resistor in the power adjusting circuit to achieve power adjustment of the output voltage; so as to ensure that the brightness control voltage obtained after operationally amplifying and following the output voltage can satisfy the power match for different dimming interfaces.
Furthermore, the power adjusting circuit includes: a level control module; wherein the voltage division resistor includes: a first resistor and a second resistor;
In this embodiment, the level control module can be adjusted with multiple levels, such as low-power level, medium-power level, and high-power level. After the user sets a specific level, one or more external resistors corresponding to that level are parallelly connected to the second resistor, thereby changing the voltage division ratio of the voltage division resistor. Wherein, the number of levels can be set according to user's needs, with the number of levels≥1. For example, 1-10 levels are set, with each level corresponding to one or a group of external resistors, and the resistance values of each or each group of external resistors are different from each other.
The present embodiment parallelly connects different external resistors to the second resistor through different levels, so as to achieve the adjustment of voltage division ratio of the voltage division resistor, thereby enabling the output voltage to have different powers to satisfy the power match for different dimming interfaces.
Please refer to
In the present embodiment, for the first level: the first external resistor can be chosen as 5 kΩ, and the second external resistor can be chosen as 0-20 kΩ; if the input voltage is 10V, after the voltage division through the 10 kΩ first resistor R6, the first external resistor, and the second external resistor, a voltage of 3.3V-7.14V can be achieved at the non-inverting input end of the operational amplifier, thus realizing a minimum-level adjustable range of 33%-72% of driving power; by adjusting the first resistor R6, the first external resistor, and the second external resistor, other adjustable power ranges can also be achieved; by operationally amplifying and following this voltage, a driving dimming input DIM voltage of 3.3V-7.14V is achieved; wherein the DIM voltage is the brightness control voltage.
In the present embodiment, for the second level: the first external resistor can be chosen as 10 kΩ, and the second external resistor can be chosen as 0-40 kΩ.
In the present embodiment, for the third level: the first external resistor can be chosen as 15 kΩ, and the second external resistor can be chosen as 0-50 kΩ; if the input voltage is 10V, after the voltage division through the 10 kΩ first resistor R6, the first external resistor, and the second external resistor, a voltage of 6V-8.67V can be achieved at the non-inverting input end of the operational amplifier, thus realizing a minimum-level adjustable range of 60%-86.7% of driving power; by adjusting the first resistor R6, the first external resistor, and the second external resistor, other adjustable power ranges can also be achieved; by operationally amplifying and following this voltage, a driving dimming input DIM voltage of 3.3V-7.14V is achieved.
In the present embodiment, when the power DIP switch SW1 is turned to the maximum level: after the voltage division through the first resistor R6 and the second resistor R7, the output voltage is directly outputted to the operational amplifier in the output circuit, and the power is at the maximum power.
The present embodiment parallelly connects external resistor branch to the second resistor, so as to achieve the adjustment of voltage division ratio, wherein the external resistor branch includes the first external resistor and the second external resistor, and by adjusting the resistance value of the adjustable second external resistor, further power adjustment of the output voltage can be achieved, thereby satisfying the power matching for different dimming interfaces.
Please refer to
In the present embodiment, the 10.6V voltage stabilizing output circuit is the first voltage stabilizing circuit, and the 10V voltage stabilizing output sensor and the light control expansion are the second voltage stabilizing circuit.
The present embodiment adjusts and controls the voltage at the control end of the first switching tube Q2 through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into the reference voltage, the expansion circuit determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Furthermore, the expansion circuit includes: a first diode D1, a second diode D2, and an external sensor module;
The present embodiment adjusts and controls the voltage at the control end of the first switching tube Q2 through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into a reference voltage, the external sensor module, in combination with the first diode D1 clamp, determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Furthermore, the expansion circuit includes: a third diode D5, a fourth diode D4, and a light controller module;
The present embodiment adjusts and controls the voltage at the control end of the first switching tube Q2 through the expansion circuit, so that after the first voltage stabilizing circuit converts the power supply voltage into the reference voltage, the light controller module, in combination with the third diode D5 clamp, determines the voltage value of the input voltage that the reference voltage is converted into, thereby changing the power adjustment range of the input voltage in the power adjusting circuit.
Please refer to
In the present embodiment, when the power adjusting circuit is set to the first level, the voltage at the V-10V point, namely at the output end of the first voltage stabilizing circuit, becomes 10V after passing through the first switching tube Q2. The voltage at the control end of the first switching tube Q2 is determined by the light controller or the external sensor module. If the output of the light controller sensor is V2, the voltage at the control end of the first switching tube Q2 is clamped to V2+0.6V by the first diode D1 or the third diode D5. The voltage at the second end of the first switching tube Q2 is V2, which is the input voltage. By dividing V2 through a 10 kΩ first resistor R6, a 15 kΩ first external resistor, and a 0-50 kΩ second external resistor, the adjustable power is achieved; and the adjustable range is: [V2*(60%-86.7%)]/10V.
In the present embodiment, when the power adjusting circuit is set to the third level, the voltage at the V-10V point, namely at the output end of the first voltage stabilizing circuit, becomes 10V after passing through the first switching tube Q2. The voltage at the control end of the first switching tube Q2 is determined by the light controller or the external sensor module. If the output of the light controller sensor is V2, the voltage at the control end of the first switching tube Q2 is clamped to V2+0.6V by the first diode D1 or the third diode D5. The voltage at the second end of the first switching tube Q2 is V2, which is the input voltage. By dividing V2 through a 10 kΩ first resistor R6, a 5 kΩ first external resistor, and a 0-20 kΩ second external resistor, the adjustable power is achieved; and the adjustable range is: [V2*(33%-72%)]/10V.
In the prior art, the 0-10V port is occupied by the power adjusting module, which results in a situation where if the customer needs to connect another dimmer, then a set of dimming lines would be occupied by multiple functional modules, therefore the multiple functional modules interfere with each other, leading to poor linearity of dimming. The circuits available on the market that use 0-10V are simple, have limited functionality, and are weak in expansibility. In contrast, the second voltage stabilizing circuit in the present invention can have an expansion circuit, which makes it convenient to expand the light control function and sensor function. Furthermore, the present invention can expand the light control and sensor control functions while achieving power adjustment and color temperature adjustment, without interfering with each other.
Furthermore, the first voltage stabilizing circuit includes: a first capacitor C1, a fourth resistor R1, a fifth resistor R2, a sixth resistor R3, a second switching tube Q1, and a first thyristor U1;
In the present embodiment, when the input voltage is 12V, and the reference voltage of the first thyristor U1 is 2.5V, the voltage across the first thyristor U1 is adjusted by the voltage division with the fifth resistor R2 and the sixth resistor R3, resulting in the first voltage stabilizing circuit outputting a reference voltage of 10.6V.
In the present embodiment, after receiving the power supply voltage, the first voltage stabilizing circuit first performs filtering through the first capacitor C1 to enhance the stability of circuit operation; then divides the voltage by the fifth resistor R2 and the sixth resistor R3 to provide the preset reference voltage to the gate of the thyristor, and in conjunction with the second switching tube Q1, converts the power supply voltage into the reference voltage of the preset voltage value, so as to achieve the stabilized voltage output; and the fourth resistor R1 prevents excessive current of the second switching tube Q1, further enhancing the stability of circuit operation.
Furthermore, the first voltage stabilizing circuit further includes: a second capacitor C2 and a third capacitor C3;
The present embodiment further uses the second capacitor C2 and the third capacitor C3 to respectively achieve the low-pass filtering between the second end and the control end of the second switching tube Q1 and the filtering at the output end of the first voltage stabilizing circuit, thereby enhancing the quality of the reference voltage.
Please refer to
In the present embodiment, the output circuit further includes: an eighth resistor R9, wherein a first end of the eighth resistor R9 is connected to the output end of the first operational amplifier OP, and a second end of the eighth resistor R9 is connected to the anode of the fifth diode D3.
In the present embodiment, the output circuit further includes: a fourth capacitor C5, wherein the positive input end of the first operational amplifier OP is connected respectively to a first end of the fourth capacitor C5 and working power supply, and the second end of the fourth capacitor C5 is grounded; the voltage value of the working power supply is 12V.
In the present embodiment, the output voltage of the power adjusting circuit passes through the non-inverting input end of the first operational amplifier OP, then the voltage is followed and outputted to the 0-10V interface of the LED driver module, thereby achieving the adjustment of luminaire's power.
In the present embodiment, the first operational amplifier OP follows the output voltage through a feedback loop provided by the seventh resistor R10, and in conjunction with the fifth diode D3, outputs the brightness control voltage required for the dimming interface.
In another aspect, the embodiments of the present invention further provide a dimming control circuit, including: a power control circuit as described in the embodiments of the present invention and a color temperature adjusting circuit. Please refer to
The present embodiment first utilizes the power supply voltage stabilizing circuit to converts the power supply voltage into the input voltage required for controlling the LED light; then adjusts the voltage division ratio of the voltage division resistor in the power adjusting circuit to achieve power adjustment of the output voltage; so as to ensure that the brightness control voltage obtained after operationally amplifying and following the output voltage can satisfy the power match for different dimming interfaces.
The specific embodiments described above provide further detailed explanation of the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only for specific embodiments of the present invention and is not intended to limit the scope of the protection of the present invention. It is particularly noted that for those skilled in the art, any modifications, equivalent replacements, improvements, and the like made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310933338.1 | Jul 2023 | CN | national |
