A power supply for a zero-neutral wire dimming system

Abstract

The present invention provides a power supply for a zero-line dimming system, belonging to the technical field of power supply technology. It solves the problem that existing power supplies cannot provide stable working power. The power supply for the zero-line dimming system includes an AC power supply and a dimming system and a load connected in series. The dimming system includes a rectifier control circuit, a setting circuit, a comparison circuit, a switching circuit, a backup power supply, and an intelligent controller. The rectifier control circuit is used to rectify the AC voltage and output a pulsating voltage. The setting circuit receives the pulsating voltage and outputs a valley interval voltage. The comparison circuit receives the valley interval voltage and outputs a result signal. The switching circuit receives the result signal and outputs a conduction voltage or a base voltage. The backup power supply receives the conduction voltage and outputs a compensation voltage. The switching circuit includes a transistor, a differential amplifier, a first resistor, a second resistor, and a trigger. The present invention has the advantages of being able to compensate for power supply through dual power supplies, thereby ensuring stable operation of the dimming system.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply, and in particular relates to a power supply for a zero-line dimming system. Background Art

[0002] In the field of light control technology, dimmers are used to adjust the brightness of a lighting load. The dimmer is connected in series between the power supply and the lighting load. Using phase control technology, the dimmer's built-in switch is turned on or off based on the AC power supply phase, forming a fixed phase angle relationship to achieve the effect of controlling the load's brightness. Existing dimmer dimming modes include: thyristor dimming (leading phase control), MOSFET soft switching dimming (lagging phase control), adding wireless communication system dimming, and switch dimming. Thyristor dimming and MOSFET soft switching dimming use chopping to change the effective output voltage of the power grid to achieve dimming. Wireless communication dimming adds a wireless transmitter to the dimmer and a wireless receiver to the lamp, using traditional wireless communication protocols (ZigBee, WIFI, Bluetooth, etc.) to achieve dimming.

[0003] Furthermore, the operating power of the lamp load and the dimmer comes from a single power source (e.g., mains electricity). In the case of thyristor dimming, since no other components requiring additional power are required, a single power source can provide stable operating power to the lamp load and the dimmer.

[0004] However, when using MOSFET soft-switching dimming and adding a wireless communication dimming mode, additional operating power is required for the wireless transmitter and receiver. Therefore, when a single power supply must simultaneously provide operating power to the lighting load, dimmer, wireless transmitter, and receiver, the increased operating power requirements can easily make the single power supply unable to provide stable operating power, resulting in the dimmer being unable to stably dim via wireless communication.

[0005] To solve the above problems, a power supply is needed that can provide the required operating power to the system according to the operating status of the dimming system, so as to achieve the effect of stable operation of the system. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a power supply for a zero-line dimming system that can provide the working power required by the system according to the usage status of the dimming system.

[0007] The objectives of the present invention can be achieved through the following technical solutions: A power supply for a zero-line dimming system, characterized in that it includes an AC power supply and a dimming system and a load connected in series, the dimming system includes a rectification control circuit, a setting circuit, a comparison circuit, a switching circuit, a backup power supply, and an intelligent controller, the rectification control circuit is used to rectify the AC voltage and output a pulsating voltage, the setting circuit receives the pulsating voltage and outputs a valley interval voltage, the comparison circuit receives the valley interval voltage and outputs a result signal, the switching circuit receives the result signal and outputs a conduction voltage or a basic voltage, the backup power supply receives the conduction voltage and outputs a compensation voltage, the intelligent controller includes a wireless connection module, when the wireless connection module is started, the intelligent controller receives the compensation voltage and outputs an instruction on whether to switch the power supply, the switching circuit includes a transistor, a differential amplifier, a first resistor, a second resistor, and a trigger.

[0008] The working principle of the present invention is as follows: During normal use, the AC power supply provides the power required by the dimming system. When the wireless connection module in the intelligent controller is activated, the backup power supply can be activated through the switching circuit to provide a compensation voltage to the intelligent controller; through the dual power supply interactive compensation power supply method, the dimming system of the present invention can run and operate stably.

[0009] In the above-mentioned power supply for the neutral-line dimming system, the rectification control circuit includes a rectification block and a load output control block, and the load output control block includes a first metal oxide semiconductor field effect transistor and a second metal oxide semiconductor field effect transistor.

[0010] In the above-mentioned power supply for the neutral-line-free dimming system, the setting circuit includes a first setting resistor, a second setting resistor, a third setting resistor, a fourth setting resistor and a Zener diode.

[0011] In the above-mentioned power supply for the neutral-line-free dimming system, the comparison circuit includes a first comparator and a bipolar transistor.

[0012] In the above-mentioned power supply for the zero-line dimming system, the switching circuit is connected to a cutoff circuit and a backup power supply.

[0013] In the above-mentioned power supply for the zero-line dimming system, the cutoff circuit includes a transistor, and the cutoff circuit is coupled to the switching circuit.

[0014] In the above-mentioned power supply for the neutral-line dimming system, the intelligent controller includes a wireless connection module, a control module and a manual control interface.

[0015] In the above-mentioned power supply for the neutral-line-free dimming system, the comparison circuit is connected to a power detection and judgment circuit.

[0016] In the above-mentioned power supply for the neutral-line-free dimming system, the power detection and judgment circuit includes a filter capacitor, a second comparator, a third resistor, and a fourth resistor.

[0017] Compared with the prior art, the present invention has the advantage of being able to compensate for power supply through dual power supplies, thereby enabling the dimming system to operate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system architecture of the present invention.

[0019] Figure 2 Schematic diagram of the system circuit of the present invention.

[0020] Figure 3 1 is a waveform diagram of the present invention (1).

[0021] Figure 4 2 is a waveform diagram of the present invention.

[0022] In the figure, 1. AC power supply; 2. load; 10. rectifier control circuit; 11. rectifier block; 12. load output control block; 20. setting circuit; 21. first setting resistor; 22. second setting resistor; 23. third setting resistor; 24. fourth setting resistor; 25. Zener diode; 30. comparison circuit; 31. first comparator; 32. bipolar transistor; 40. switching circuit; 41. transistor; 42. differential amplifier; 43. first resistor; 44. second resistor; 45. trigger; 50. backup power supply; 6 0. Cut-off circuit; 70. Intelligent controller; 71. Control module; 72. Wireless connection module; 73. Manual control interface; 80. Power detection and judgment circuit; 81. Filter capacitor; 82. Third resistor; 83. Fourth resistor; 84. Second comparator; 100. Dimming system; 121. First MOSFET; 122. Second MOSFET; A. Power node; V1. AC voltage; V2. Ripple voltage; V3. Critical voltage; V4. Valley voltage; V5. Compensation voltage; Vf, threshold voltage. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figures 1-4As shown, the power supply for the zero-line dimming system includes an AC power supply 1 and a dimming system 100 and a load 2 connected in series. The dimming system 100 includes a rectifier control circuit 10, a setting circuit 20, a comparison circuit 30, a switching circuit 40, a backup power supply 50, and an intelligent controller 70. The rectifier control circuit 10 is used to rectify the AC voltage and output a pulsating voltage V2. The setting circuit 20 receives the pulsating voltage and outputs a valley interval voltage V4. The comparison circuit 30 receives the valley interval voltage V4 and outputs a result signal. The switching circuit 40 receives the result signal and outputs a conduction voltage or a basic voltage. The backup power supply 50 receives the conduction voltage and outputs a compensation voltage V5. The intelligent controller The controller 70 includes a wireless connection module 72. When the wireless connection module 72 is activated, the intelligent controller 70 receives the compensation voltage V5 and outputs an instruction on whether to switch the power supply. The switching circuit 40 includes a transistor 41, a differential amplifier 42, a first resistor 43, a second resistor 44, and a trigger 45. The switching circuit 40 outputs a conduction voltage according to the result signal or outputs a basic voltage corresponding to the setting circuit 20. The differential amplifier 42 amplifies the conduction voltage of the transistor 41 into an amplified voltage. The amplified voltage is input to the positive input terminal of the trigger 45 through a voltage divider of the first resistor 43 and the second resistor 44. The conduction voltage is output from the output terminal of the trigger 45 to trigger the backup power supply 50.

[0025] In further detail, the rectifier control circuit 10 includes a rectifier block 11 and a load output control block 12. The load output control block 12 includes a first metal oxide semiconductor field effect transistor 121 and a second metal oxide semiconductor field effect transistor 122. The rectifier control circuit 10 rectifies the AC voltage V1 and then outputs a pulsating voltage V2 from the output end of the rectifier block 11.

[0026] In further detail, the setting circuit 20 includes a first setting resistor 21, a second setting resistor 22, a third setting resistor 23, a fourth setting resistor 24, and a Zener diode 25. The setting circuit 20 sets a threshold voltage V3 corresponding to the pulsating voltage V2 according to the characteristics of the load 2. The threshold voltage V3 captures the pulsating voltage V2 and outputs a valley voltage V4.

[0027] In further detail, the comparison circuit 30 includes a first comparator 31 and a bipolar transistor 32. The comparison circuit 30 compares the valley voltage V4 with a threshold voltage Vf to output a result signal. When the valley voltage V4 is equal to or less than the threshold voltage Vf, the bipolar transistor 32 is turned on; when the valley voltage is greater than the threshold voltage Vf, the bipolar transistor 32 is not turned on, so the result signal is a signal indicating whether the bipolar transistor 32 is turned on or off.

[0028] In further detail, the switching circuit 40 is connected to the cutoff circuit 60 and the backup power supply 50, and the backup power supply 50 is coupled to the trigger 45 of the switching circuit 40. The backup power supply 50 outputs a compensation voltage V5 according to the conduction voltage. The power node A is coupled to the switching circuit 40 and the backup power supply 50. The basic voltage or compensation voltage V5 will be input into the power node A. The voltage of the power node A is the basic voltage or the compensation voltage V5; wherein, the voltage of the power node A will be respectively provided to the working power input end of the first comparator 31 of the comparison circuit 30, the working power input end of the differential amplifier 42, the working power input end of the trigger 45 and the power input end of the intelligent controller 70.

[0029] In further detail, the cutoff circuit 60 includes a transistor, is coupled to the switching circuit 40, and is coupled to the backup power supply 50. The cutoff circuit 60 cuts off the basic voltage input power node A according to the compensation voltage V5.

[0030] In further detail, the intelligent controller 70 includes a wireless connection module 72, a control module 71 and a manual control interface 73. The intelligent controller 70 is coupled to the power node A. The control module 71 can control the luminous brightness of the load 2; the wireless connection module 72 is used to wirelessly connect to the smart mobile device, operate the control module 71 in a wireless connection manner, and thereby control the luminous brightness of the load 2; the manual control interface 73 is used to provide a wired connection method, and the control module 71 is operated externally to thereby control the luminous brightness of the load 2.

[0031] In more detail, the comparison circuit 30 is connected to the power detection and judgment circuit 80 .

[0032] In further detail, the power detection circuit 80 includes a filter capacitor 81, a second comparator 84, a third resistor 82, and a fourth resistor 83. The voltage at power node A is filtered by filter capacitor 81 and then divided by third resistor 82 and fourth resistor 83 to generate a detection voltage. This detection voltage is input to the positive input terminal of second comparator 84. Second comparator 84 outputs a system voltage signal to control module 71 of intelligent controller 70. When the control module 71 outputs a conduction signal indicating that the current voltage at power node A is insufficient, it indicates that load 2 is using too much power, that is, the luminous brightness of load 2 has exceeded the set limit. In this case, load 2 is turned off through load output control block 12, preventing load 2 from using too much power. Conversely, when the control module 71 outputs a conduction signal indicating that the current voltage at power node A is sufficient, it indicates that load 2 is using an appropriate amount of power, that is, the luminous brightness of load 2 is appropriate. In this case, load 2 is kept on through load output control block 12.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0034] Although a large number of terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A power supply for a zero-line dimming system, characterized in that: It includes an AC power supply and a dimming system and a load connected in series. The dimming system includes a rectifier control circuit, a setting circuit, a comparison circuit, a switching circuit, a backup power supply, and an intelligent controller. The rectifier control circuit includes a rectifier block and a load output control block. The load output control block includes a first metal oxide semiconductor field effect transistor and a second metal oxide semiconductor field effect transistor. The first and second half field effect transistors have connected sources and drains respectively connected to the two output terminals of the rectifier block. The rectifier control circuit is used to rectify the AC voltage and output a pulsating voltage. The setting circuit receives the pulsating voltage and outputs a valley interval voltage, and includes first to fourth setting resistors and a Zener diode. The comparison circuit receives the valley interval voltage and outputs a result signal, and includes a first comparator and a bipolar transistor. The first and second setting resistors and the Zener diode are connected in series in sequence. One end of the third setting resistor is connected to the series connection point of the first and second setting resistors, and the other end is connected in series with the fourth setting resistor and then connected to the negative electrode of the first comparator. The switching circuit is connected to a cutoff circuit and a backup power supply, and is composed of a transistor, a differential amplifier, a first resistor, a second resistor, and a trigger. The base of the transistor is connected to the series connection point of the second resistor and the Zener diode, and the emitter is connected to the positive and negative electrodes of the differential amplifier. One end of the first resistor is connected to the output end of the differential amplifier, and the other end is connected in series with the second resistor and the positive terminal of the trigger. The switching circuit receives the result signal and outputs a conduction voltage or a basic voltage; the backup power supply receives the conduction voltage and outputs a compensation voltage; the cut-off circuit includes a transistor, and the cut-off circuit is coupled to the switching circuit.

2. The power supply for a zero-line dimming system according to claim 1, characterized in that: The intelligent controller includes a wireless connection module, a control module and a manual control interface. When the wireless connection module is started, the intelligent controller receives the compensation voltage and outputs an instruction on whether to switch the power supply.

3. The power supply for a zero-line dimming system according to claim 1, characterized in that: The comparison circuit is connected to a power detection and judgment circuit, and the power detection and judgment circuit includes a filter capacitor, a second comparator, a third resistor, and a fourth resistor.

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