Dimming circuit and lighting system that do not need to distinguish between input and output

Abstract

The present invention is applicable to the field of dimming technology, and provides a dimming circuit and a lighting system that do not need to distinguish between input and output, including a filtering module, a rectifying module, a signal control module, and a MOS driving module; the rectifying module supplies power to the signal control module and the MOS driving module; when the first end of the filtering module is connected to the live wire and the third end is connected to the lamp, the signal control module sends a first dimming signal to the MOS driving module according to the user input, and the MOS driving module outputs a dimming voltage to the third end of the filtering module according to the first dimming signal; when the first end of the filtering module is connected to the lamp and the third end is connected to the live wire, the signal control module sends a second dimming signal to the MOS driving module, and the MOS driving module outputs a dimming voltage to the first end of the filtering module according to the second dimming signal. The present invention is compatible with single-phase zero and live wires, does not need to distinguish between the live wire and the load wire, can work with random wiring, is convenient to operate, and avoids the problem of abnormal operation caused by incorrect wiring.

Description

Technical Field

[0001] The present invention belongs to the technical field of dimming, and particularly relates to a dimming circuit and a lighting system that do not need to distinguish between input and output. Background Art

[0002] Smart Dimmer switches play an important role in smart homes, especially in hotels. When using a smart dimmer switch, there are strict wiring requirements. However, traditional smart dimmer switches often have the phenomenon of incorrect connection between the live wire and the load wire (the wire connected to the lamp), which does not meet the safety regulations requirements and poses a certain danger. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a dimming circuit and a lighting system that do not need to distinguish between input and output, so as to solve the problem that traditional smart dimmer switches often have the phenomenon of incorrect connection between the live wire and the load wire, which does not meet the safety regulations requirements and poses a certain danger.

[0004] The first aspect of the embodiments of the present invention provides a dimming circuit that does not need to distinguish between input and output, including: a filtering module, a rectifying module, a signal control module, and a MOS driving module;

[0005] The first end of the filtering module is connected to one of the live wire and the lamp, the second end is connected to the neutral wire, the third end is connected to the other of the live wire and the lamp, and both the second end and the third end are connected to the input end of the rectifying module; the output end of the rectifying module is connected to both the power supply end of the signal control module and the power supply end of the MOS driving module; the first signal end of the signal control module is connected to the first receiving end of the MOS driving module, and the second signal end is connected to the second receiving end of the MOS driving module; the first voltage end of the MOS driving module is connected to the first end of the filtering module, and the second voltage end is connected to the third end of the filtering module;

[0006] The rectifying module supplies power to the signal control module and the MOS driving module;

[0007] When the first end of the filtering module is connected to the live wire and the third end is connected to the lamp, the signal control module sends a first dimming signal to the MOS driving module according to the user input, and the MOS driving module outputs a dimming voltage to the third end of the filtering module according to the first dimming signal;

[0008] When the first end of the filtering module is connected to the lamp and the third end is connected to the live wire, the signal control module sends a second dimming signal to the MOS driving module according to the user input, and the MOS driving module outputs a dimming voltage to the first end of the filtering module according to the second dimming signal.

[0009] Further, the filtering module includes: a filtering unit, a resonant unit, a first varistor, a second varistor, and a third varistor;

[0010] The first end of the filtering unit, the first end of the resonant unit, the first end of the first varistor, and the first end of the second varistor are all connected to the first end of the filtering module. The second end of the filtering unit, the second end of the first varistor, and the first end of the third varistor are all connected to the second end of the filtering module. The second end of the resonant unit, the second end of the second varistor, and the second end of the third varistor are all connected to the third end of the filtering module.

[0011] Further, the MOS driving module includes: a first MOS transistor, a second MOS transistor, a first capacitor, a second capacitor, a first voltage stabilizing diode, a second voltage stabilizing diode, a first resistor, a second resistor, a first driving unit, and a second driving unit; the first MOS transistor and the second MOS transistor are MOS transistors of the same model;

[0012] The drain of the first MOS transistor is connected to the first voltage terminal of the MOS driving module. The gate of the first MOS transistor is connected to the first end of the first capacitor, the cathode of the first voltage stabilizing diode, and the first end of the first resistor. The source of the first MOS transistor is connected to the second end of the first capacitor, the anode of the first voltage stabilizing diode, the anode of the second voltage stabilizing diode, the first end of the second capacitor, and the source of the second MOS transistor; the second end of the first resistor is connected to the output terminal of the first driving unit;

[0013] The drain of the second MOS transistor is connected to the second voltage terminal of the MOS driving module. The gate of the second MOS transistor is connected to the second end of the second capacitor, the cathode of the second voltage stabilizing diode, and the first end of the second resistor; the second end of the second resistor is connected to the output terminal of the second driving unit; the voltage terminals of the first driving unit and the second driving unit are both connected to the power supply terminal of the MOS driving module. The input terminal of the first driving unit is connected to the first receiving terminal of the MOS driving module. The input terminal of the second driving unit is connected to the second receiving terminal of the MOS driving module.

[0014] Further, both the first driving unit and the second driving unit include: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a first triode, a second triode, and a third triode;

[0015] The first end of the third resistor is the output end. The second end of the third resistor is connected to the collector of the first triode. The first diode is connected in parallel with the third resistor.

[0016] The collector of the first triode is grounded through the fourth resistor. The emitter of the first triode serves as the voltage terminal. The emitter of the first triode is also connected to the base through the fifth resistor. The base of the first triode is connected to the collector of the second triode through the sixth resistor.

[0017] The emitter of the second triode is grounded. The base of the second triode is connected to the emitter through the seventh resistor. The base of the second triode is also connected to the collector of the third triode through the eighth resistor.

[0018] The emitter of the third triode is also the voltage terminal. The emitter of the third triode is also connected to the base through the ninth resistor. The base of the third triode is connected to the first end of the tenth resistor. The second end of the tenth resistor serves as the input end.

[0019] Further, the rectification module includes: an AC-DC unit and a DC-DC unit.

[0020] The input end of the AC-DC unit is connected to the input end of the rectification module. The output end of the AC-DC unit is connected to both the power supply end of the MOS drive module and the input end of the DC-DC unit. The output end of the DC-DC unit is connected to both the power supply end of the signal control module and the power supply end of the MOS drive module.

[0021] The AC-DC unit provides a first voltage for the MOS drive module. The DC-DC unit provides a second voltage for the signal control module and the MOS drive module.

[0022] Further, the AC-DC unit includes: a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first polarized capacitor, a second polarized capacitor, a third polarized capacitor, a third capacitor, a fourth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a rectification chip.

[0023] The anode of the second diode is connected to the second end of the filtering module. The anode of the third diode is connected to the third end of the filtering module. The cathodes of the second diode and the third diode are both connected to the first end of the first inductor. The first end of the first inductor is also grounded through the first polarized capacitor. The second end of the first inductor is connected to the input pin of the rectification chip. The second end of the first inductor is also grounded through the second polarized capacitor.

[0024] The clock pin of the rectification chip is connected to the cathode of the fourth diode through the third capacitor, and the clock pin is also connected to the cathode of the fifth diode through the eleventh resistor; the feedback pin of the rectification chip is connected to the cathode of the fifth diode through the twelfth resistor, and the feedback pin is also connected to the cathode of the fourth diode through the thirteenth resistor; the output pin of the rectification chip is connected to the first end of the second inductor and the cathode of the fourth diode; the anode of the fourth diode is grounded;

[0025] The first end of the fourth capacitor is connected to the cathode of the fifth diode, and the second end of the fourth capacitor is connected to the first end of the second inductor; the second end of the second inductor is connected to both the anode of the fifth diode and the output end of the AC-DC unit, and the second end of the second inductor is also grounded through the third polarized capacitor.

[0026] Further, the dimming circuit that does not need to distinguish between input and output further includes: a zero-crossing detection module;

[0027] The power supply end of the zero-crossing detection module is connected to the output end of the rectification module, the detection end is connected to the first end or the third end of the filtering module, and the output end is connected to the third signal end of the signal control module; the zero-crossing detection module detects whether the alternating current of the live wire passes through the zero point and sends a zero-point signal to the signal control module; the signal control module outputs a dimming signal synchronized with the voltage waveform of the live wire according to the zero-point signal.

[0028] Further, the zero-crossing detection module includes: a fourth diode, a fifth capacitor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor;

[0029] The cathode of the fourth diode is the power supply end of the zero-crossing detection module, and the anode of the fourth diode is connected to the first end of the fifth capacitor, the first end of the fourteenth resistor, the first end of the fifteenth resistor and the first end of the sixteenth resistor; the second end of the fourteenth resistor is the detection end of the zero-crossing detection module; the second end of the fifteenth resistor is the output end of the zero-crossing detection module; the second ends of the fifth capacitor and the sixteenth resistor are both grounded.

[0030] Further, the dimming circuit that does not need to distinguish between input and output further includes: a wireless signal receiving module;

[0031] The receiving end of the wireless signal receiving module is connected to an external antenna, and the output end of the wireless signal receiving module is connected to the fourth signal end of the signal control module;

[0032] The wireless signal receiving module is used to receive the wireless control signal sent by the user and send the wireless control signal to the signal control module; the signal control module sends a first dimming signal or a second dimming signal to the MOS driving module according to the wireless control signal.

[0033] The second aspect of the embodiment of the present invention provides a lighting system, including a lamp, and further including the dimming circuit that does not need to distinguish input and output as provided in any one of the first aspects of the embodiments.

[0034] The beneficial effects of the embodiment of the present invention compared with the prior art are as follows: The circuit mainly includes a filtering module, a rectifying module, a signal control module and a MOS driving module, with a simple structure and low cost; when the first end of the filtering module is connected to the live wire and the third end is connected to the lamp, the signal control module sends a first dimming signal to the MOS driving module, and the MOS driving module outputs a dimming voltage to the third end of the filtering module according to the first dimming signal; when the first end of the filtering module is connected to the lamp and the third end is connected to the live wire, the signal control module sends a second dimming signal to the MOS driving module, and the MOS driving module outputs a dimming voltage to the first end of the filtering module according to the second dimming signal, realizing single-neutral and live-wire compatibility, without the need to distinguish between the live wire and the load wire, and it can work with any wiring, which is convenient for operation and avoids the problem of abnormal operation caused by incorrect wiring. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the dimming circuit that does not need to distinguish input and output provided by the embodiment of the present invention;

[0037] Figure 2 It is a schematic circuit diagram of the filtering module and the CMOS driving module provided by the embodiment of the present invention;

[0038] Figure 3 It is a schematic circuit diagram of the first driving unit and the second driving unit provided by the embodiment of the present invention

[0039] Figure 4 It is a schematic circuit diagram of the zero-crossing detection module provided by the embodiment of the present invention;

[0040] Figure 5 It is a schematic circuit diagram of the AC-DC unit provided by the embodiment of the present invention;

[0041] Figure 6 It is a circuit schematic diagram of the DC-DC unit provided by an embodiment of the present invention. Detailed implementation manners

[0042] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0043] In order to illustrate the technical solutions described in the present invention, specific embodiments are used for illustration below.

[0044] Refer to Figure 1 , a dimming circuit that does not need to distinguish between input and output provided in this embodiment mainly includes: a filtering module 100, a rectifying module 200, a signal control module 300, and a MOS driving module 400.

[0045] The first end of the filtering module 100 is connected to one of the live wire and the lamp, the second end is connected to the neutral wire N, and the third end is connected to the other of the live wire and the lamp. Both the second end and the third end of the filtering module 100 are connected to the input end of the rectifying module 200. That is, the first end of the filtering module 100 can be either the input end L or the load end Load, and the third end can be either the input end L or the load end Load. For example, when the first end of the filtering module 100 is the input end L and is connected to the live wire, the third end is the load end Load and is connected to the lamp. Or when the third end of the filtering module 100 is the input end L and is connected to the live wire, the first end is the load end Load and is connected to the lamp.

[0046] The output end of the rectifying module 200 is connected to both the power supply end of the signal control module 300 and the power supply end of the MOS driving module 400; the first signal end of the signal control module 300 is connected to the first receiving end of the MOS driving module 400, and the second signal end is connected to the second receiving end of the MOS driving module 400; the first voltage end of the MOS driving module 400 is connected to the first end of the filtering module 100, and the second voltage end is connected to the third end of the filtering module 100. The rectifying module 200 supplies power to the signal control module 300 and the MOS driving module 400.

[0047] Specifically, when the first end of the filtering module 100 is connected to the live wire and the third end of the filtering module 100 is connected to the lamp, the signal control module 300 sends a first dimming signal to the MOS driving module 400 according to the user input, and the MOS driving module 400 outputs a dimming voltage to the third end of the filtering module 100 according to the first dimming signal.

[0048] Alternatively, when the first end of the filtering module 100 is connected to the lamp and the third end of the filtering module 100 is connected to the live wire L, the signal control module 300 sends a second dimming signal to the MOS driving module 400 according to the user input, and the MOS driving module 400 outputs a dimming voltage to the first end of the filtering module 100 according to the second dimming signal, that is, the distinction between the live wire end and the load end is eliminated.

[0049] The above dimming circuit that does not require distinguishing between input and output has a simple structure and low cost. It can be compatible with single neutral and live wires, without the need to distinguish between the live wire and the load wire, and can work with random wiring, which is convenient to operate and avoids the problem of abnormal operation caused by incorrect wiring.

[0050] In one embodiment, referring to Figure 2 , the filtering module 100 may include: a filtering unit, a resonant unit, a first varistor RV1, a second varistor RV2, and a third varistor RV3. In order to enable both the L end (the first end connected to the live wire) and the Load end (the third end connected to the lamp) to be used as the live wire input end, a third varistor RV3 is added between the N end and the Load end in this embodiment, and an F2 fuse is also added at the Load end to ensure the safety of the circuit.

[0051] The first end of the filtering unit, the first end of the resonant unit, the first end of the first varistor RV1, and the first end of the second varistor RV2 are all connected to the first end of the filtering module 100. The second end of the filtering unit, the second end of the first varistor RV1, and the first end of the third varistor RV3 are all connected to the second end of the filtering module 100. The second end of the resonant unit, the second end of the second varistor RV2, and the second end of the third varistor RV3 are all connected to the third end of the filtering module 100. Referring to Figure 2 , the filtering unit may include a resistor RA, a resistor RB, and a capacitor CX1, and the resonant unit may include a capacitor CX2 and a resistor RC.

[0052] Furthermore, the MOS driving module 400 may include: a first MOS transistor Q1, a second MOS transistor Q2, a first capacitor C1, a second capacitor C2, a first voltage stabilizing diode Dz1, a second voltage stabilizing diode Dz2, a first resistor R1, a second resistor R2, a first driving unit 410, and a second driving unit 420; the first MOS transistor Q1 and the second MOS transistor Q2 are MOS transistors of the same model. Among them, the first resistor R1 is the driving resistor of the first MOS transistor Q1. The function of the first voltage stabilizing diode Dz1 is to clamp the driving voltage of the first MOS transistor Q1 within the safe operating voltage range of the MOS transistor. At the same time, the voltage of the first MOS transistor Q1 can also discharge through the first voltage stabilizing diode Dz1. The function of the second voltage stabilizing diode Dz2 is to clamp the driving voltage of the second MOS transistor Q2 within the safe operating voltage range of the MOS transistor. At the same time, the voltage of the second MOS transistor Q2 can also discharge through the second voltage stabilizing diode Dz2.

[0053] The drain of the first MOS transistor Q1 is connected to the first end of the filtering module 100. The gate of the first MOS transistor Q1 is connected to the first end of the first capacitor C1, the cathode of the first voltage stabilizing diode Dz1, and the first end of the first resistor R1. The source of the first MOS transistor Q1 is connected to the second end of the first capacitor C1, the anode of the first voltage stabilizing diode Dz1, the anode of the second voltage stabilizing diode Dz2, the first end of the second capacitor C2, and the source of the second MOS transistor Q2; the second end of the first resistor R1 is connected to the output end of the first driving unit 410.

[0054] The drain of the second MOS transistor Q2 is connected to the third end of the filtering module 100, and the gate is connected to the second end of the second capacitor C2, the cathode of the second voltage stabilizing diode Dz2, and the first end of the second resistor R2; the second end of the second resistor R2 is connected to the output end of the second driving unit 420; the voltage terminals of the first driving unit 410 and the second driving unit 420 are both connected to the output terminals (12V voltage and 3.3V voltage) of the rectifying module. The input terminal of the first driving unit 410 is connected to the first signal terminal of the signal control module 300, and the input terminal of the second driving unit 420 is connected to the second signal terminal of the signal control module 300.

[0055] Optionally, both the first driving unit 410 and the second driving unit 420 include: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a first triode, a second triode, and a third triode. The first end of the third resistor is the output end, the second end of the third resistor is connected to the collector of the first triode, and the first diode is connected in parallel with the third resistor. The collector of the first triode is grounded through the fourth resistor, the emitter of the first triode serves as the voltage terminal, the emitter of the first triode is further connected to the base through the fifth resistor, and the base of the first triode is connected to the collector of the second triode through the sixth resistor. The emitter of the second triode is grounded, the base of the second triode is connected to the emitter through the seventh resistor, and the base of the second triode is further connected to the collector of the third triode through the eighth resistor. The emitter of the third triode is also the voltage terminal, the emitter of the third triode is further connected to the base through the ninth resistor, and the base of the third triode is connected to the first end of the tenth resistor; the second end of the tenth resistor serves as the input end. The first triode and the third triode can be PNP triodes, and the second triode can be an NPN triode.

[0056] As Figure 3 , the first driving unit 410 includes a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a diode D6, a triode Q3, a triode Q4, and a triode Q5, and the second driving unit 420 includes a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a diode D7, a triode Q6, a triode Q7, and a triode Q8.

[0057] Further, the rectification module 200 of this embodiment may include: an AC-DC unit and a DC-DC unit. The input end of the AC-DC unit is connected to the second end of the filtering module, and the output end of the AC-DC unit is connected to both the power supply end of the MOS driving module 400 and the input end of the DC-DC unit; the output end of the DC-DC unit is connected to both the power supply end of the signal control module 300 and the power supply end of the MOS driving module 400. The AC-DC unit provides a first voltage for the MOS driving module 400, for example, outputs 12V, and the DC-DC unit provides a second voltage for the signal control module 300, the MOS driving module 400, and the wireless signal receiving module 500, for example, 3.3V.

[0058] Optionally, refer to Figure 5, the AC-DC unit may include: a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first inductor L1, a second inductor L2, a first polarized capacitor Cr1, a second polarized capacitor Cr2, a third polarized capacitor Cr3, a third capacitor C3, a fourth capacitor C4, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a rectifier chip U1. The anode of the second diode D2 is connected to the second terminal of the filter module 100, the anode of the third diode D3 is connected to the third terminal of the filter module 100, and the cathodes of the second diode D2 and the third diode D3 are both connected to the first terminal of the first inductor L1. The rectifier chip U1 may be a chip of model LNK304.

[0059] The first terminal of the first inductor L1 is also grounded through the first polarized capacitor Cr1, the second terminal of the first inductor L1 is connected to the input pin D of the rectifier chip U1, and the second terminal of the first inductor L1 is also grounded through the second polarized capacitor Cr2. The clock pin BP of the rectifier chip U1 is connected to the cathode of the fourth diode D4 through the third capacitor C3, and the clock pin BP is also connected to the cathode of the fifth diode D5 through the eleventh resistor R11; the feedback pin FB of the rectifier chip U1 is connected to the cathode of the fifth diode D5 through the twelfth resistor R12, and the feedback pin FB is also connected to the cathode of the fourth diode D4 through the thirteenth resistor R13; the output pin S of the rectifier chip U1 is connected to the first terminal of the second inductor L2 and the cathode of the fourth diode D4; the anode of the fourth diode D4 is grounded. The first terminal of the fourth capacitor C4 is connected to the cathode of the fifth diode D5, and the second terminal of the fourth capacitor C4 is connected to the first terminal of the second inductor L2; the second terminal of the second inductor L2 is connected to both the anode of the fifth diode D5 and the output terminal of the AC-DC unit, and the second terminal of the second inductor L2 is also grounded through the third polarized capacitor Cr3.

[0060] See Figure 6 , the DC-DC unit may include a diode D11, a resistor L4, a capacitor C11, a capacitor C12, a transformer chip U2, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, an inductor L3, a resistor R40, a resistor R41, a resistor R42, and a resistor R43. The anode of the diode D11 serves as the input terminal, and the second terminal of the inductor L3 serves as the output terminal, outputting a 3.3V voltage to the first driving unit 410, the second driving unit 420, the signal control module 300, and the wireless signal receiving module 500. Optionally, the transformer chip U2 is a chip of model SY8201, and the capacitor C11, the capacitor C12, and the resistor R40 filter the input voltage of 12V. The resistor R42, the resistor R43, the capacitor C16, and the capacitor C17 can make the voltage output stably, ensuring the stability of the power supply.

[0061] Specifically, whether the live wire is connected to the L terminal or the Load terminal, the live wire voltage is rectified by the second diode D2 or the third diode D3 when it is on the negative half-axis, enters the rectification chip U1, then reaches the lamp through the body diode of the first MOS transistor Q1 or the second MOS transistor Q2, and then reaches the neutral wire, forming a loop to realize lamp control. Since the first MOS transistor Q1 and the second MOS transistor Q2 are two identical MOS transistors symmetrically connected in series between the L terminal and the Load terminal, it can work properly whether the live wire is connected from the L terminal or the Load terminal. For example, in the case of a single live wire, when the Load terminal is connected to the live wire, the voltage is rectified by the third diode D3 when it is on the negative half-axis, then enters the body diodes of the first MOS transistor Q1 and the second MOS transistor Q2 through the rectification chip U1, and reaches the neutral wire terminal through the lamp. Or when the L terminal is connected to the live wire, the voltage is rectified by the second diode D2 when it is on the negative half-axis, then enters the body diodes of the first MOS transistor Q1 and the second MOS transistor Q2 through the rectification chip U1, and reaches the neutral wire terminal through the lamp.

[0062] In one embodiment, the dimming circuit that does not need to distinguish between input and output may further include: a zero-crossing detection module. The power supply terminal of the zero-crossing detection module is connected to the output terminal of the rectification module 200, and the detection terminal is connected to the first terminal or the third terminal of the filtering module 100, that is, which terminal of the filtering module 100 is connected to the live wire, the detection terminal of the zero-crossing detection module is connected to which terminal of the filtering module 100, and the output terminal of the zero-crossing detection module is connected to the third signal terminal of the signal control module 300; the zero-crossing detection module detects whether the alternating current of the live wire passes through the zero point and sends a zero point signal to the signal control module 300; the signal control module 300 outputs a dimming signal synchronized with the voltage waveform of the live wire according to the zero point signal.

[0063] Optionally, referring to Figure 4 , the zero-crossing detection module may include: a fourth diode D4, a fifth capacitor C5, a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor RD. The cathode of the fourth diode D4 is the power supply terminal of the zero-crossing detection module, and the anode of the fourth diode D4 is connected to the first terminal of the fifth capacitor C5, the first terminal of the fourteenth resistor R14, the first terminal of the fifteenth resistor R15, and the first terminal of the sixteenth resistor RD; the second terminal of the fourteenth resistor R14 is the detection terminal of the zero-crossing detection module; the second terminal of the fifteenth resistor R15 is the output terminal of the zero-crossing detection module; the second terminals of the fifth capacitor C5 and the sixteenth resistor RD are both grounded.

[0064] Specifically, by the voltage division of the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor RD, the zero-crossing point of the voltage of the alternating current (the voltage of the live wire) is detected. When the alternating current has not passed through zero, the zero signal output by the zero-crossing detection module and the dimming signal of the signal control module 300 are synchronous PWM signals. When the alternating current passes through zero, the zero signal is at a low level. The signal control module 300 will detect the rising edge of the zero signal and respond to the dimming signal, and the dimming signal output is at a low level, so that the first MOS transistor Q1 or the second MOS transistor Q2 conducts alternately, and thus a synchronous leading-edge or trailing-edge phase-cut AC waveform appears.

[0065] Further, in the dual-MOS transistor control circuit, it can be seen that when the first dimming signal DIMOUT1 of the signal control module 300 is at a low level, the triode Q5 conducts, the base of the triode Q4 is at a high level, and the triode Q4 is also in a saturated conduction state. The base of the triode Q3 is at a low level and is saturated and conducting. The 12V voltage provides voltage for the gate of the first MOS transistor Q1. At this time, if the L terminal is connected to the live wire and the alternating current is in the positive half-axis, after the zero-crossing point, the first MOS transistor Q1 immediately conducts; conversely, when the alternating current is in the negative half-axis, when the second dimming signal DIMOUT2 of the signal control module 300 is at a low level, the second MOS transistor Q2 conducts, so as to ensure a complete AC wave output to the load terminal within one cycle. On the contrary, if the Load terminal is connected to the live wire and the alternating current is in the positive half-axis, when the second dimming signal DIMOUT2 of the signal control module 300 is at a low level, after the zero-crossing point, the second MOS transistor Q2 immediately conducts. When the alternating current is in the negative half-axis, the first MOS transistor Q1 conducts. Since the duty cycle of the dimming signal of the signal control module 300 changes between 0% and 100%, the phase angles corresponding to the conduction and cut-off of the MOS transistor also change, resulting in the leading-edge or trailing-edge phase cut of the voltage waveform of the alternating current, and thus changing the effective value of the voltage of the alternating current to control the brightness of the LED lamp.

[0066] In one embodiment, the dimming circuit that does not need to distinguish between input and output may further include: a wireless signal receiving module 500. The receiving end of the wireless signal receiving module 500 is connected to an external antenna, and the output end of the wireless signal receiving module 500 is connected to the fourth signal terminal of the signal control module 300.

[0067] The wireless signal receiving module 500 is used to receive the wireless control signal sent by the user and send the wireless control signal to the signal control module 300; the signal control module 300 sends the first dimming signal or the second dimming signal to the MOS driving module 400 according to the wireless control signal. The wireless signal receiving module 500 may be a Z-wave signal receiving device, such as a ZM5101 chip circuit. The signal frequency received by the external antenna may be 908 - 916 MHz.

[0068] In the above embodiments, the circuit mainly includes components with a simple structure and low cost. Through the third varistor RV3 of the filtering module 100, the second diode D2 and the third diode D3 of the rectifying module 200, and the symmetrical MOS transistors, when the Load terminal is connected to the lamp, the MOS driving module 400 outputs a dimming voltage to the third terminal of the filtering module 100 according to the first dimming signal. When the L terminal is connected to the lamp, the MOS driving module 400 outputs a dimming voltage to the first terminal of the filtering module 100 according to the second dimming signal, achieving single-neutral and single-live wire compatibility. There is no need to distinguish between the live wire and the load wire, and it can work with any wiring, which is convenient for operation and avoids the problem of abnormal operation caused by incorrect wiring.

[0069] This embodiment also provides a lighting system, which includes a lamp and a dimming circuit that does not need to distinguish between input and output in any of the above embodiments, and also has the beneficial effects of any of the above dimming circuits that do not need to distinguish between input and output.

[0070] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the above division of each functional unit and module is used as an example. In practical applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the circuit is divided into different functional units or modules to complete all or part of the functions described above. In addition, the specific names of each functional unit and module are only for easy distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and should all be included in the protection scope of the present invention.

Claims

1. A dimming circuit that does not need to distinguish between input and output, characterized in that, it includes: a filtering module, a rectifying module, a signal control module, and a MOS driving module; The first end of the filtering module is connected to one of the live wire and the lamp, the second end is connected to the neutral wire, the third end is connected to the other of the live wire and the lamp, and both the second end and the third end are connected to the input end of the rectifying module; the output end of the rectifying module is connected to both the power supply end of the signal control module and the power supply end of the MOS driving module; the first signal end of the signal control module is connected to the first receiving end of the MOS driving module, and the second signal end is connected to the second receiving end of the MOS driving module; the first voltage end of the MOS driving module is connected to the first end of the filtering module, and the second voltage end is connected to the third end of the filtering module; The rectifying module supplies power to the signal control module and the MOS driving module; When the first end of the filtering module is connected to the live wire and the third end is connected to the lamp, the signal control module sends a first dimming signal to the MOS driving module according to the user input, and the MOS driving module outputs a dimming voltage to the third end of the filtering module according to the first dimming signal; When the first end of the filtering module is connected to the lamp and the third end is connected to the live wire, the signal control module sends a second dimming signal to the MOS driving module according to the user input, and the MOS driving module outputs a dimming voltage to the first end of the filtering module according to the second dimming signal; The dimming circuit that does not need to distinguish between input and output further includes: a zero-crossing detection module and a wireless signal receiving module; The power supply end of the zero-crossing detection module is connected to the output end of the rectifying module, the detection end is connected to the first end or the third end of the filtering module, and the output end is connected to the third signal end of the signal control module; the zero-crossing detection module detects whether the alternating current of the live wire passes through the zero point and sends a zero-point signal to the signal control module; the signal control module outputs a dimming signal synchronized with the voltage waveform of the live wire according to the zero-point signal; The zero-crossing detection module includes: a fourth diode, a fifth capacitor, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor; The cathode of the fourth diode is the power supply end of the zero-crossing detection module, and the anode of the fourth diode is connected to the first end of the fifth capacitor, the first end of the fourteenth resistor, the first end of the fifteenth resistor, and the first end of the sixteenth resistor; the second end of the fourteenth resistor is the detection end of the zero-crossing detection module; the second end of the fifteenth resistor is the output end of the zero-crossing detection module; the second ends of the fifth capacitor and the sixteenth resistor are both grounded; The receiving end of the wireless signal receiving module is connected to an external antenna, and the output end of the wireless signal receiving module is connected to the fourth signal end of the signal control module; The wireless signal receiving module is used to receive the wireless control signal sent by the user and send the wireless control signal to the signal control module; the signal control module sends a first dimming signal or a second dimming signal to the MOS driving module according to the wireless control signal.

2. The dimming circuit without distinguishing input and output as described in claim 1, wherein, the filtering module includes: a filtering unit, a resonant unit, a first varistor, a second varistor and a third varistor; the first end of the filtering unit, the first end of the resonant unit, the first end of the first varistor and the first end of the second varistor are all connected to the first end of the filtering module, the second end of the filtering unit, the second end of the first varistor and the first end of the third varistor are all connected to the second end of the filtering module, and the second end of the resonant unit, the second end of the second varistor and the second end of the third varistor are all connected to the third end of the filtering module.

3. The dimming circuit without distinguishing input and output as described in claim 1, wherein, the MOS driving module includes: a first MOS transistor, a second MOS transistor, a first capacitor, a second capacitor, a first voltage stabilizing diode, a second voltage stabilizing diode, a first resistor, a second resistor, a first driving unit and a second driving unit; the first MOS transistor and the second MOS transistor are MOS transistors of the same model; the drain of the first MOS transistor is connected to the first voltage terminal of the MOS driving module, the gate of the first MOS transistor is connected to the first end of the first capacitor, the cathode of the first voltage stabilizing diode and the first end of the first resistor, and the source of the first MOS transistor is connected to the second end of the first capacitor, the anode of the first voltage stabilizing diode, the anode of the second voltage stabilizing diode, the first end of the second capacitor and the source of the second MOS transistor; the second end of the first resistor is connected to the output terminal of the first driving unit; the drain of the second MOS transistor is connected to the second voltage terminal of the MOS driving module, the gate of the second MOS transistor is connected to the second end of the second capacitor, the cathode of the second voltage stabilizing diode and the first end of the second resistor; the second end of the second resistor is connected to the output terminal of the second driving unit; the voltage terminals of the first driving unit and the second driving unit are both connected to the power supply terminal of the MOS driving module, the input terminal of the first driving unit is connected to the first receiving terminal of the MOS driving module, and the input terminal of the second driving unit is connected to the second receiving terminal of the MOS driving module.

4. The dimming circuit without distinguishing input and output as described in claim 3, wherein, both the first driving unit and the second driving unit include: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first diode, a first triode, a second triode and a third triode; The first end of the third resistor is the output end. The second end of the third resistor is connected to the collector of the first triode. The first diode is connected in parallel with the third resistor. The collector of the first triode is grounded through the fourth resistor. The emitter of the first triode serves as the voltage terminal. The emitter of the first triode is also connected to the base through the fifth resistor. The base of the first triode is connected to the collector of the second triode through the sixth resistor. The emitter of the second triode is grounded. The base of the second triode is connected to the emitter through the seventh resistor. The base of the second triode is also connected to the collector of the third triode through the eighth resistor. The emitter of the third triode is also the voltage terminal. The emitter of the third triode is also connected to the base through the ninth resistor. The base of the third triode is connected to the first end of the tenth resistor. The second end of the tenth resistor serves as the input end.

5. The dimming circuit without distinguishing input and output as described in claim 1, characterized in that the rectification module includes: an AC-DC unit and a DC-DC unit; The input end of the AC-DC unit is connected to the input end of the rectification module. The output end of the AC-DC unit is connected to the power supply end of the MOS driving module and the input end of the DC-DC unit. The output end of the DC-DC unit is connected to the power supply end of the signal control module and the power supply end of the MOS driving module. The AC-DC unit provides a first voltage for the MOS driving module. The DC-DC unit provides a second voltage for the signal control module and the MOS driving module.

6. The dimming circuit without distinguishing input and output as described in claim 5, characterized in that the AC-DC unit includes: a second diode, a third diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first polarized capacitor, a second polarized capacitor, a third polarized capacitor, a third capacitor, a fourth capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a rectification chip; The anode of the second diode is connected to the second end of the filtering module. The anode of the third diode is connected to the third end of the filtering module. The cathodes of the second diode and the third diode are both connected to the first end of the first inductor. The first end of the first inductor is also grounded through the first polarized capacitor. The second end of the first inductor is connected to the input pin of the rectification chip. The second end of the first inductor is also grounded through the second polarized capacitor. The clock pin of the rectifier chip is connected to the cathode of the fourth diode through the third capacitor, and the clock pin is also connected to the cathode of the fifth diode through the eleventh resistor; the feedback pin of the rectifier chip is connected to the cathode of the fifth diode through the twelfth resistor, and the feedback pin is also connected to the cathode of the fourth diode through the thirteenth resistor; the output pin of the rectifier chip is connected to the first end of the second inductor and the cathode of the fourth diode; the anode of the fourth diode is grounded; The first end of the fourth capacitor is connected to the cathode of the fifth diode, and the second end of the fourth capacitor is connected to the first end of the second inductor; the second end of the second inductor is connected to both the anode of the fifth diode and the output end of the AC-DC unit, and the second end of the second inductor is also grounded through the third polarized capacitor.

7. A lighting system, comprising a lamp, Characterized in that, It further comprises a dimming circuit that does not need to distinguish between input and output as described in any one of claims 1 to 6.

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