Intelligent control silicon controlled rectifier stable output circuit and dimming driver

Abstract

The utility model provides an intelligent control silicon controlled rectifier stable output circuit. The intelligent control silicon controlled rectifier stable output circuit comprises a silicon controlled rectifier signal input circuit, a rectification filter circuit, an intelligent control dimming module and a load power supply circuit. The rectification filter circuit is connected with the output end of the silicon controlled signal input circuit and is connected with the load power supply circuit through the active damping circuit. The intelligent control dimming module forms a control loop with a rectification filter circuit and a load power supply circuit through a plurality of electronic switch tubes, resistors, capacitors and other elements. When sine wave alternating current is input, the load power supply circuit outputs the maximum output current to the LED load; when a phase switching signal is input, the signal control end of the intelligent control dimming module outputs a high level, so that electronic switching tubes in the dummy load holding circuit and the small board load holding circuit are conducted and form a current loop, and therefore, a silicon controlled rectifier can obtain enough holding current and work stably; and the stability of the intelligent control silicon controlled rectifier stable output circuit is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thyristor dimming, and in particular to an intelligently controlled thyristor stable output circuit and a dimming driver. Background Art

[0002] In the field of lighting technology, with the widespread adoption of LED light sources, efficient and stable brightness control of LED lamps has become a key issue. Traditional lamp dimming methods include analog dimming, PWM dimming, and thyristor dimming. Thyristor dimming has gained widespread adoption in LED lamp dimming due to its simple circuit design, convenient operation, and strong compatibility with existing dimming circuits.

[0003] The basic principle of thyristor dimming technology is to adjust the voltage input to LED lamps by controlling the conduction angle of the thyristor, thereby adjusting the lamp brightness. However, when the thyristor is conducting, its current may oscillate due to external factors, causing the current to fall below the thyristor's holding current. The thyristor may shut down prematurely, causing the LED lamp to flicker or shut down accidentally.

[0004] For example, reference document CN201510320369.5 discloses an LED dimming circuit and dimming method with a thyristor (SCR). The main dimming process involves detecting the voltage phase using a timing circuit composed of a comparator circuit and a charge-discharge circuit to obtain a square wave signal representing the SCR phase angle. The comparator circuit then receives the output signal of a second counter and a reference zero voltage to output a dimming angle duty cycle signal. A multiplication circuit receives the dimming angle duty cycle signal and a reference voltage signal to generate a reference signal. An error compensation circuit receives the reference signal and a voltage feedback signal representing the LED load current to amplify and compensate the error and generate a compensation signal. A PWM control circuit receives the compensation signal and generates a PWM control signal. This signal is used to control the power switch in the power stage circuit, thereby achieving dimming control of the LED load. However, this solution is prone to erroneous shutdown of the SCR due to insufficient holding current during dimming output. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide an intelligently controlled thyristor-stabilized output circuit and a dimming driver with dummy load compensation and holding current.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] An intelligent controlled thyristor stable output circuit comprises a thyristor signal input circuit, a rectifier and filter circuit, an intelligent controlled dimming module and a load power supply circuit.

[0008] The input end of the thyristor signal input circuit is used to connect to an external signal source, the rectifier and filter circuit includes a rectifier bridge circuit and an active damping circuit, the output end of the thyristor signal input circuit is connected to the input end of the rectifier bridge circuit, the output end of the rectifier bridge circuit is connected to the input end of the active damping circuit, and the output end of the active damping circuit is connected to the load power supply circuit.

[0009] The intelligent control dimming module includes a dummy load maintenance circuit, a signal control circuit and a current stabilization circuit, and the PWM output end of the signal control circuit is connected to the PWM receiving end of the load power supply circuit;

[0010] The dummy load maintaining circuit includes a first electronic switch tube and a first resistor, wherein a first end of the first resistor is connected to the output end of the rectifier bridge circuit, a second end of the first resistor is connected to the first end of the first electronic switch tube, a control end of the first electronic switch tube is connected to the second signal control end of the signal control circuit, and a second end of the first electronic switch tube is grounded;

[0011] The current stabilization circuit includes a second electronic switching tube and a third electronic switching tube, a second resistor, a third resistor, a first capacitor, a second capacitor and a first inductor. The first end of the first capacitor and the first end of the first inductor are both connected to the output end of the active damping circuit, the second end of the first inductor and the first end of the second capacitor are both connected to the input end of the load power supply circuit, the second end of the first capacitor is grounded through the second resistor, the second end of the second capacitor is grounded through the third resistor, the first end of the second electronic switching tube is connected to the first end of the second resistor, the first end of the third electronic switching tube is connected to the first end of the third resistor, the second end of the second electronic switching tube and the second end of the third electronic switching tube are grounded, and the control end of the second electronic switching tube and the control end of the third electronic switching tube are both connected to the first signal control end of the signal control circuit.

[0012] In one embodiment, the intelligent control dimming module also includes a small board load maintenance circuit, which includes a fourth electronic switch tube and a fourth resistor. The control end of the fourth electronic switch tube is connected to the third signal control end of the signal control circuit, the first end of the fourth electronic switch tube is connected to the output end of the rectifier bridge circuit, and the second end of the fourth electronic switch tube is grounded through the fourth resistor.

[0013] In one embodiment, the current stabilization circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the first end of the first inductor, and a second end of the fifth resistor is connected to the second end of the first inductor.

[0014] In one embodiment, the dummy load maintaining circuit further includes a sixth resistor, a first end of the sixth resistor is connected to the control end of the first electronic switch tube, and a second end of the sixth resistor is grounded.

[0015] In one embodiment, the signal control circuit includes a main control chip and a first signal control circuit, the first signal control circuit includes a seventh resistor and a fifth electronic switch tube, the first end of the seventh resistor is connected to an external power supply, the second end of the seventh resistor and the first signal control end of the signal control circuit are connected to the first end of the fifth electronic switch tube, the control end of the fifth electronic switch tube is connected to the first switch signal output end of the main control chip, and the second end of the fifth electronic switch tube is grounded.

[0016] In one embodiment, the signal control circuit also includes a second signal control circuit, which includes an eighth resistor and a sixth electronic switch tube. The first end of the eighth resistor is connected to an external power supply, the second end of the eighth resistor and the second signal control end of the signal control circuit are connected to the first end of the sixth electronic switch tube, the control end of the sixth electronic switch tube is connected to the second switch signal output end of the main control chip, and the second end of the sixth electronic switch tube is grounded.

[0017] In one embodiment, the signal control circuit also includes a third signal control circuit, which includes a ninth resistor and a seventh electronic switch tube. The first end of the ninth resistor is connected to an external power supply, the second end of the ninth resistor and the third signal control end of the signal control circuit are connected to the first end of the seventh electronic switch tube, the control end of the seventh electronic switch tube is connected to the third switch signal output end of the main control chip, and the second end of the seventh electronic switch tube is grounded.

[0018] In one embodiment, the thyristor signal input circuit includes a thyristor dimmer and an EMI filter circuit, the input end of the thyristor dimmer is used to connect to an external power supply, the output end of the thyristor dimmer is connected to the input end of the EMI filter circuit, and the output end of the EMI filter circuit is connected to the rectifier filter circuit.

[0019] In one embodiment, the load power supply circuit includes a flyback circuit and a DC transformer circuit, the input end of the flyback circuit is connected to the output end of the rectifier and filter circuit, the input end of the DC transformer circuit is connected to the output end of the flyback circuit, and the output end of the DC transformer circuit is used to connect to the LED load.

[0020] A dimming driver comprises any one of the above-mentioned intelligent controlled silicon-controlled stable output circuits.

[0021] Compared with the prior art, the present disclosure has at least the following advantages:

[0022] 1. The above-mentioned intelligent control thyristor stable output circuit monitors the input signal of the thyristor signal input circuit through the intelligent control dimming module. When the input signal is a sine wave signal, the first signal control terminal of the signal control circuit outputs a high-level signal, so that the second electronic switch tube and the third electronic switch tube are turned on, so that the first inductor, the first capacitor and the second capacitor form a π-shaped filter circuit, thereby removing the harmonic components in the circuit; when the input signal has a phase-cut signal, the first signal control terminal of the signal control circuit outputs a low-level signal, so that the second electronic switch tube and the third electronic switch tube are turned off, so that the first inductor, the first capacitor, the second capacitor, the second resistor and the third resistor jointly form an RLC damping circuit, thereby preventing the thyristor conduction current from oscillating through zero and causing it to be abnormally shut down.

[0023] 2. On the other hand, when the input signal has a phase-cut signal, the second signal control terminal of the signal control circuit outputs a high level, causing the first electronic switch tube to be turned on, and current to flow through the dummy load holding circuit, so that the dummy load holding circuit provides a compensation current path for the thyristor, thereby preventing the thyristor from being mistakenly shut down due to insufficient holding current when the conduction angle is small or deep dimming is performed, thereby improving the stability of the intelligent control thyristor stable output circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic structural diagram of an intelligent control thyristor stable output circuit according to an embodiment;

[0026] Figure 2 for Figure 1 The circuit diagram of the intelligent control thyristor stable output circuit shown;

[0027] Figure 3 for Figure 1 Another circuit diagram of the intelligent control thyristor stable output circuit shown;

[0028] Figure 4 for Figure 2 The circuit diagram of the current stabilization circuit shown;

[0029] Figure 5 for Figure 2 The circuit diagram of the dummy load holding circuit shown;

[0030] Figure 6 for Figure 3 The circuit diagram of the small board load maintenance circuit shown;

[0031] Figure 7 for Figure 3 The partial circuit diagram of the intelligent control circuit shown;

[0032] Figure 8 This is the dimming curve diagram of the intelligent control thyristor stable output circuit. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0037] like Figures 1 to 7 As shown, an intelligent control thyristor stable output circuit 10 according to an embodiment of the present disclosure includes a thyristor signal input circuit 100 , a rectifier and filter circuit 200 , an intelligent control dimming module 300 , and a load power supply circuit 400 .

[0038] The input end of the thyristor signal input circuit 100 is used to connect to an external signal source. The rectifier and filter circuit 200 includes a rectifier bridge circuit 210 and an active damping circuit 220. The output end of the thyristor signal input circuit 100 is connected to the input end of the rectifier bridge circuit 210. The output end of the rectifier bridge circuit 210 is connected to the input end of the active damping circuit 220. The output end of the active damping circuit 220 is connected to the load power supply circuit 400.

[0039] The intelligent control dimming module 300 includes a dummy load maintaining circuit 310 , a signal control circuit 320 and a current stabilizing circuit 330 . The PWM output terminal of the signal control circuit 320 is connected to the PWM receiving terminal of the load power supply circuit 400 .

[0040] The dummy load holding circuit includes a first electronic switch tube Q1 and a first resistor R13. The first end of the first resistor R13 is connected to the output end of the rectifier bridge circuit 210, the second end of the first resistor R13 is connected to the first end of the first electronic switch tube Q1, the control end of the first electronic switch tube Q1 is connected to the second signal control end GD2 of the signal control circuit 320, and the second end of the first electronic switch tube Q1 is grounded.

[0041] The current stabilization circuit 330 includes a second electronic switch Q3 and a third electronic switch Q4, a second resistor R16, a third resistor R19, a first capacitor C2, a second capacitor C5, and a first inductor L1. The first end of the first capacitor C2 and the first end of the first inductor L1 are both connected to the output end of the active damping circuit 220. The second end of the first inductor L1 and the first end of the second capacitor C5 are both connected to the input end of the load power supply circuit 400. The second end of the first capacitor C2 is grounded via the second resistor R16, and the second end of the second capacitor C5 is grounded via the third resistor R19. The first end of the second electronic switch Q3 is connected to the first end of the second resistor R16, the first end of the third electronic switch Q4 is connected to the first end of the third resistor R19, the second end of the second electronic switch Q3 and the second end of the third electronic switch Q4 are grounded, and the control end of the second electronic switch Q3 and the control end of the third electronic switch Q4 are both connected to the first signal control end GD1 of the signal control circuit.

[0042] In this embodiment, when the thyristor signal input circuit 100 is not connected to the thyristor dimmer 110, the thyristor signal input circuit 100 will output a sinusoidal alternating current to the rectifier bridge circuit 210, and the rectifier bridge circuit 210 will convert the sinusoidal alternating current into direct current, which is then transmitted to the active damping circuit 220 and the intelligent control dimming module 300; at this time, the intelligent control dimming module 300 detects that the input signal of the thyristor signal input circuit 100 is a sinusoidal alternating current signal, and the first signal control terminal GD1 of the signal control circuit 320 outputs a high-level signal, so that the first signal control terminal GD1 of the signal control circuit 320 is connected to the first signal control terminal GD2 of the signal control circuit 320. The voltage at the control terminal of the second electronic switch Q3 connected to the terminal GD1 is greater than its threshold voltage, turning on the second electronic switch Q3. Simultaneously, the voltage at the control terminal of the third electronic switch Q4 connected to the first signal control terminal GD1 of the signal control circuit 320 is greater than its threshold voltage, turning on the third electronic switch Q4. As a result, the first inductor L1, the first capacitor C2, and the second capacitor C5 form a π-type filter circuit, which removes harmonic components from the DC power. The active damping circuit 220 then conducts the DC power to the π-type filter circuit, which then outputs the current to the load power supply circuit 400.

[0043] Furthermore, the second signal control terminal GD2 of the signal control circuit 320 outputs a low-level signal, so that the voltage at the control terminal of the first electronic switch tube Q1 connected to the second signal control terminal GD2 of the signal control circuit 320 is less than its threshold voltage, thereby turning off the first electronic switch tube Q1, and further making it impossible for the dummy load maintenance circuit 310 to form a current loop; then, the PWM output terminal of the signal control circuit 320 continuously outputs a high-level signal with a duty cycle of 100% to the PWM receiving terminal of the load power supply circuit 400, so that the load power supply circuit 400 outputs the maximum output current to the LED load.

[0044] Specifically, when the thyristor signal input circuit 100 is connected to the thyristor dimmer 110, the thyristor dimmer 110 can output a phase-cutting signal, wherein the phase-cutting signal refers to a specific signal that controls the phase change of the alternating current by precisely controlling the conduction and cut-off moments of the alternating current, thereby adjusting the brightness of the lighting system. The rectifier bridge circuit 210 converts AC power with a phase-cut signal into DC power, which is then transmitted to the active damping circuit 220 and the intelligent control dimming module 300. When the intelligent control dimming module 300 detects a phase-cut signal in the input signal of the thyristor signal input circuit 100, the first signal control terminal GD1 of the signal control circuit 320 outputs a low-level signal, causing the voltage at the control terminals of the second electronic switch Q3 and the third electronic switch Q4 connected to the first signal control terminal GD1 of the signal control circuit 320 to fall below their threshold voltages. The second electronic switch Q3 and the third electronic switch Q4 are turned off, thereby causing the first inductor L1, the first capacitor C2, the second capacitor C5, the second resistor R16, and the third resistor R19 to form an RLC damping circuit, thereby preventing the thyristor conduction current from oscillating through zero and causing it to abnormally shut down. Finally, the active damping circuit 220 transmits the DC power to the RLC damping circuit, which is then output to the load power supply circuit 400.

[0045] Furthermore, the second signal control terminal GD2 of the signal control circuit 320 outputs a high-level signal, so that the voltage at the control terminal of the first electronic switch tube Q1 connected to the second signal control terminal GD2 of the signal control circuit 320 is greater than its threshold voltage, thereby turning on the first electronic switch tube Q1. The rectifier bridge circuit 210 outputs a direct current that forms a current loop with the ground terminal through the first electronic switch tube Q1 and the first resistor R13. When the conduction angle of the thyristor is small or deep dimming is performed, the dummy load maintenance circuit 310 provides a compensation current path for the thyristor, thereby avoiding the problem of the thyristor being mistakenly shut down due to insufficient maintenance current.

[0046] Furthermore, the PWM output terminal of the signal control circuit 320 outputs a high-level signal of a corresponding duty cycle to the PWM receiving terminal of the load power supply circuit 400 according to the phase-cut signal, so that the load power supply circuit 400 adjusts the output current to the LED load according to the duty cycle, thereby realizing the dimming function of the intelligent control thyristor stabilized output circuit 10. The corresponding dimming curve of the intelligent control thyristor stabilized output circuit 10 is detailed in FIG. Figure 8 .

[0047] The intelligent controlled thyristor stable output circuit 10 monitors the input signal of the thyristor signal input circuit 100 via the intelligent controlled dimming module 300. When the input signal is a sinusoidal signal, the first signal control terminal GD1 of the signal control circuit 320 outputs a high-level signal, turning on the second electronic switch Q3 and the third electronic switch Q4. This causes the first inductor L1, the first capacitor C2, and the second capacitor C5 to form a π-shaped filter circuit, thereby removing harmonic components in the circuit. When the input signal contains a phase-cut signal, the first signal control terminal GD1 of the signal control circuit 320 outputs a low-level signal, turning off the second electronic switch Q3 and the third electronic switch Q4. This causes the first inductor L1, the first capacitor C2, the second capacitor C5, the second resistor R16, and the third resistor R19 to collectively form an RLC damping circuit, thereby preventing the thyristor conduction current from oscillating through zero and causing it to abnormally shut down.

[0048] On the other hand, when the input signal has a phase-cut signal, the second signal control terminal GD2 of the signal control circuit 320 outputs a high level, causing the first electronic switch tube Q1 to be turned on, and current to flow through the dummy load holding circuit 310, so that the dummy load holding circuit 310 provides a compensation current path for the thyristor, thereby preventing the thyristor from being mistakenly shut down due to insufficient holding current when the conduction angle is small or deep dimming is performed, thereby improving the stability of the intelligent control thyristor stable output circuit 10.

[0049] In another embodiment, the first electronic switch tube Q1, the second electronic switch tube Q3, and the third electronic switch tube Q4 are all N-channel MOS tubes, the first ends of the first electronic switch tube Q1, the second electronic switch tube Q3, and the third electronic switch tube Q4 are all drains of the N-channel MOS tubes, the first electronic switch tube Q1, the second electronic switch tube Q3, and the third electronic switch tube Q4 are all sources of the N-channel MOS tubes, and the control ends of the first electronic switch tube Q1, the second electronic switch tube Q3, and the third electronic switch tube Q4 are all gates of the N-channel MOS tubes.

[0050] like Figure 6As shown, in one embodiment, the intelligent control dimming module 300 further includes a small board load maintenance circuit 340. The small board load maintenance circuit 340 includes a fourth electronic switch Q2 and a fourth resistor R7. The control terminal of the fourth electronic switch Q2 is connected to the third signal control terminal GD3 of the signal control circuit. The first terminal of the fourth electronic switch Q2 is connected to the output terminal of the rectifier bridge circuit 210. The second terminal of the fourth electronic switch Q2 is grounded via the fourth resistor R7. In this embodiment, when the intelligent control dimming module 300 monitors that the input signal of the thyristor signal input circuit 100 is a sinusoidal AC signal, the third signal control terminal GD3 of the signal control circuit 320 outputs a low-level signal, causing the voltage at the control terminal of the fourth electronic switch Q2 connected to the third signal control terminal GD3 of the signal control circuit 320 to be less than its threshold voltage, thereby turning off the fourth electronic switch Q2, thereby preventing the small board load maintenance circuit 340 from forming a current loop.

[0051] Furthermore, when the intelligent control dimming module 300 monitors that the input signal of the thyristor signal input circuit 100 has a phase-cutting signal, the third signal control terminal GD3 of the signal control circuit 320 outputs a high-level signal, so that the voltage at the control terminal of the fourth electronic switch tube Q2 connected to the third signal control terminal GD3 of the signal control circuit 320 is greater than its threshold voltage, thereby turning on the fourth electronic switch tube Q2, and the rectifier bridge circuit 210 outputs direct current to form a current loop with the ground terminal through the fourth electronic switch tube Q2 and the fourth resistor R7. When the conduction angle of the thyristor is small or deep dimming is performed, a compensation current path is provided for the thyristor through the small board load maintenance circuit 340, thereby avoiding the problem of the thyristor being mistakenly shut down due to insufficient maintenance current.

[0052] In another embodiment, the fourth electronic switch tube Q2 is an N-channel MOS tube, the first end of the fourth electronic switch tube Q2 is the drain of the N-channel MOS tube, the second end of the fourth electronic switch tube Q2 is the source of the N-channel MOS tube, and the control end of the fourth electronic switch tube Q2 is the gate of the N-channel MOS tube.

[0053] like Figure 4 As shown, in one embodiment, the current stabilization circuit 330 further includes a fifth resistor R18, wherein a first end of the fifth resistor R18 is connected to a first end of the first inductor L1, and a second end of the fifth resistor R18 is connected to a second end of the first inductor L1. In this embodiment, due to the inductor's resistance to current changes, the first inductor L1 may generate oscillations in the circuit. The ends of the fifth resistor R18 are respectively connected to the ends of the first inductor L1, thereby connecting it in parallel with the first inductor L1. The fifth resistor R18 can provide a damping effect. When oscillations occur in the circuit, the fifth resistor R18 can dissipate some energy, thereby reducing the oscillations and causing them to gradually decay, thereby ensuring that the current stabilization circuit 330 can output a stable current.

[0054] like Figure 5 As shown, in one embodiment, the dummy load maintenance circuit 310 further includes a sixth resistor R12. The first end of the sixth resistor R12 is connected to the control terminal of the first electronic switch Q1, and the second end of the sixth resistor R12 is grounded. In this embodiment, the sixth resistor R12 acts as a voltage divider in the circuit and provides a stable bias voltage for the first electronic switch Q1. This helps the first electronic switch Q1 maintain normal operation. At the same time, the sixth resistor R12 provides a current discharge path, reducing the voltage at the control terminal of the first electronic switch Q1 and preventing damage to the first electronic switch Q1 caused by excessive voltage, thereby improving the stability of the dummy load maintenance circuit 310.

[0055] like Figure 3 and Figure 7 As shown, in one embodiment, the signal control circuit 320 includes a main control chip U1 and a first signal output circuit. The first signal output circuit includes a seventh resistor R21 and a fifth electronic switch tube Q5. The first end of the seventh resistor R21 is connected to an external power supply, the second end of the seventh resistor R21 and the first signal control end GD1 of the signal control circuit are connected to the first end of the fifth electronic switch tube Q5, the control end of the fifth electronic switch tube Q5 is connected to the first switch signal output end SW1 of the main control chip U1, and the second end of the fifth electronic switch tube Q5 is grounded. In this embodiment, when the first switch signal output terminal SW1 of the main control chip U1 outputs a high-level signal, the voltage at the control terminal of the fifth electronic switch tube Q5 is greater than its threshold voltage, causing the fifth electronic switch tube Q5 to be turned on. Current forms a current loop with the ground terminal through the seventh resistor R21 and the fifth electronic switch tube Q5. Since the first signal control terminal GD1 of the signal control circuit 320 is connected to the first end of the fifth electronic switch tube Q5, the first signal control terminal GD1 of the signal control circuit 320 outputs a high-level signal. Furthermore, by controlling the output signal of the first switch signal output terminal SW1 of the main control chip U1, the output signal of the first signal control terminal GD1 of the signal control circuit 320 can be changed.

[0056] In another embodiment, the fifth electronic switch tube Q5 is an N-channel MOS tube, the first end of the fifth electronic switch tube Q5 is the drain of the N-channel MOS tube, the second end of the fifth electronic switch tube Q5 is the source of the N-channel MOS tube, and the control end of the fifth electronic switch tube Q5 is the gate of the N-channel MOS tube.

[0057] like Figure 7As shown, in one embodiment, the signal control circuit 320 further includes a second signal output circuit, which includes an eighth resistor R27 and a sixth electronic switch tube Q6. The first end of the eighth resistor R27 is connected to the external power supply, the second end of the eighth resistor R27 and the second signal control end GD2 of the signal control circuit are connected to the first end of the sixth electronic switch tube Q6, the control end of the sixth electronic switch tube Q6 is connected to the second switch signal output end SW2 of the main control chip U1, and the second end of the sixth electronic switch tube Q6 is grounded. In this embodiment, when the second switch signal output terminal SW2 of the main control chip U1 outputs a high-level signal, the voltage at the control terminal of the sixth electronic switch tube Q6 is greater than its threshold voltage, causing the sixth electronic switch tube Q6 to be turned on. Current forms a current loop with the ground terminal through the eighth resistor R27 and the sixth electronic switch tube Q6. Since the second signal control terminal GD2 of the signal control circuit 320 is connected to the first terminal of the sixth electronic switch tube Q6, the second signal control terminal GD2 of the signal control circuit 320 outputs a high-level signal. Furthermore, by controlling the output signal of the second switch signal output terminal SW2 of the main control chip U1, the output signal of the second signal control terminal GD2 of the signal control circuit 320 can be changed.

[0058] In another embodiment, the sixth electronic switch tube Q6 is an N-channel MOS tube, the first end of the sixth electronic switch tube Q6 is the drain of the N-channel MOS tube, the second end of the sixth electronic switch tube Q6 is the source of the N-channel MOS tube, and the control end of the sixth electronic switch tube Q6 is the gate of the N-channel MOS tube.

[0059] like Figure 7 As shown, in one embodiment, the signal control circuit 320 further includes a third signal control circuit, which includes a ninth resistor R24 and a seventh electronic switch tube Q7. The first end of the ninth resistor R24 is connected to the external power supply, the second end of the ninth resistor R24 and the third signal control end GD3 of the signal control circuit are connected to the first end of the seventh electronic switch tube Q7, the control end of the seventh electronic switch tube Q7 is connected to the third switch signal output end SW3 of the main control chip U1, and the second end of the seventh electronic switch tube Q7 is grounded. In this embodiment, when the third switch signal output terminal SW3 of the main control chip U1 outputs a high-level signal, the voltage at the control terminal of the seventh electronic switch tube Q7 is greater than its threshold voltage, causing the seventh electronic switch tube Q7 to be turned on. Current forms a current loop with the ground terminal through the ninth resistor R24 and the seventh electronic switch tube Q7. Since the third signal control terminal GD3 of the signal control circuit 320 is connected to the first terminal of the seventh electronic switch tube Q7, the third signal control terminal GD3 of the signal control circuit 320 outputs a high-level signal. Furthermore, by controlling the output signal of the third switch signal output terminal SW3 of the main control chip U1, the output signal of the third signal control terminal GD3 of the signal control circuit 320 can be changed.

[0060] In another embodiment, the seventh electronic switch tube Q7 is an N-channel MOS tube, the first end of the seventh electronic switch tube Q7 is the drain of the N-channel MOS tube, the second end of the seventh electronic switch tube Q7 is the source of the N-channel MOS tube, and the control end of the seventh electronic switch tube Q7 is the gate of the N-channel MOS tube.

[0061] like Figure 1 and Figure 2 As shown, in one embodiment, a thyristor signal input circuit 100 includes a thyristor dimmer 110 and an EMI filter circuit 120. The input of the thyristor dimmer 110 is connected to an external power source, the output of the thyristor dimmer 110 is connected to the input of the EMI filter circuit 120, and the output of the EMI filter circuit 120 is connected to a rectifier filter circuit 200. In this embodiment, after the AC power output from the output of the thyristor dimmer 110 enters the EMI filter circuit 120, the inductor and capacitor in the EMI filter circuit 120 combine to form a low-pass filter, which blocks changes in high-frequency interference signals and directs high-frequency signals to the ground terminal, effectively attenuating high-frequency interference signals. At the same time, low-frequency signals can be filtered and output from the EMI filter circuit 120 to the rectifier filter circuit 200. This ensures that during the thyristor dimming process, oscillations caused by current changes, which can cause flickering in the LED load, are avoided. This improves the stability of the intelligent control thyristor stable output circuit 10.

[0062] like Figure 1 and Figure 2 As shown, in one embodiment, the load power supply circuit 400 includes a flyback circuit 410 and a DC converter circuit 420. The input of the flyback circuit 410 is connected to the output of the rectifier and filter circuit 200, and the input of the DC converter circuit 420 is connected to the output of the flyback circuit 410. The output of the DC converter circuit 420 is connected to the LED load. In this embodiment, the transformer in the flyback circuit 410 also provides electrical isolation, preventing mutual interference between the input and output. When the load power supply circuit 400 is overloaded, the flyback circuit 410 can provide timely protection. The DC-DC converter circuit can stabilize its output voltage through an internal feedback control mechanism, thereby reducing output voltage fluctuations and ripple, thereby ensuring stable output of the DC converter circuit 420.

[0063] A dimming driver includes an intelligent control thyristor stable output circuit 10 as described above. In this embodiment, when the thyristor signal input circuit 100 is not connected to the thyristor dimmer 110, the thyristor signal input circuit 100 will output a sinusoidal alternating current to the rectifier bridge circuit 210, and the rectifier bridge circuit 210 will convert the sinusoidal alternating current into direct current, which is then transmitted to the active damping circuit 220 and the intelligent control dimming module 300. At this time, the intelligent control dimming module 300 detects that the input signal of the thyristor signal input circuit 100 is a sinusoidal alternating current signal, and the first signal control terminal GD1 of the signal control circuit 320 outputs a high-level signal, so that the first signal control terminal GD1 of the signal control circuit 320 is connected to the first signal control terminal GD1 of the signal control circuit 320. The voltage at the control terminal of the second electronic switch Q3 connected to the terminal GD1 is greater than its threshold voltage, turning on the second electronic switch Q3. Simultaneously, the voltage at the control terminal of the third electronic switch Q4 connected to the first signal control terminal GD1 of the signal control circuit 320 is greater than its threshold voltage, turning on the third electronic switch Q4. As a result, the first inductor L1, the first capacitor C2, and the second capacitor C5 form a π-type filter circuit, which removes harmonic components from the DC power. The active damping circuit 220 then conducts the DC power to the π-type filter circuit, which then outputs the current to the load power supply circuit 400. Furthermore, the second signal control terminal GD2 of the signal control circuit 320 outputs a low-level signal, causing the voltage at the control terminal of the first electronic switch Q1 connected to the second signal control terminal GD2 of the signal control circuit 320 to be less than its threshold voltage, thereby turning off the first electronic switch Q1 and preventing the dummy load maintenance circuit 310 from forming a current loop. The PWM output terminal of the signal control circuit 320 then continuously outputs a high-level signal with a 100% duty cycle to the PWM receiving terminal of the load power supply circuit 400, causing the load power supply circuit 400 to output the maximum output current to the LED load. Specifically, when the thyristor signal input circuit 100 is connected to the thyristor dimmer 110, the thyristor dimmer 110 can output a phase-cutting signal. A phase-cutting signal is a specific signal that precisely controls the on and off moments of the alternating current, thereby controlling the phase change of the alternating current and thereby adjusting the brightness of the lighting system.The rectifier bridge circuit 210 converts AC power with a phase-cut signal into DC power, which is then transmitted to the active damping circuit 220 and the intelligent control dimming module 300. When the intelligent control dimming module 300 detects a phase-cut signal in the input signal of the thyristor signal input circuit 100, the first signal control terminal GD1 of the signal control circuit 320 outputs a low-level signal, causing the voltage at the control terminals of the second electronic switch Q3 and the third electronic switch Q4 connected to the first signal control terminal GD1 of the signal control circuit 320 to fall below their threshold voltages. The second electronic switch Q3 and the third electronic switch Q4 are turned off, thereby causing the first inductor L1, the first capacitor C2, the second capacitor C5, the second resistor R16, and the third resistor R19 to form an RLC damping circuit, thereby preventing the thyristor conduction current from oscillating through zero and causing it to abnormally shut down. Finally, the active damping circuit 220 transmits the DC power to the RLC damping circuit, which is then output to the load power supply circuit 400. Furthermore, the second signal control terminal GD2 of the signal control circuit 320 outputs a high-level signal, causing the voltage at the control terminal of the first electronic switch Q1 connected to the second signal control terminal GD2 of the signal control circuit 320 to exceed its threshold voltage, thereby turning on the first electronic switch Q1. The DC power output by the rectifier bridge circuit 210 forms a current loop with the ground terminal through the first electronic switch Q1 and the first resistor R13. When the conduction angle of the thyristor is small or deep dimming is required, the dummy load maintenance circuit 310 provides a compensation current path for the thyristor, thereby preventing the thyristor from erroneously shutting down due to insufficient maintenance current. Furthermore, the PWM output terminal of the signal control circuit 320 outputs a high-level signal with a corresponding duty cycle according to the phase-cutting signal to the PWM receiving terminal of the load power supply circuit 400, causing the load power supply circuit 400 to adjust the output current to the LED load according to the duty cycle, thereby realizing the dimming function of the intelligently controlled thyristor stable output circuit 10.

[0064] Compared with the prior art, the present disclosure has at least the following advantages:

[0065] 1. The intelligent controlled thyristor stable output circuit 10 described above monitors the input signal of the thyristor signal input circuit 100 through the intelligent controlled dimming module 300. When the input signal is a sinusoidal signal, the first signal control terminal GD1 of the signal control circuit 320 outputs a high-level signal, turning on the second electronic switch Q3 and the third electronic switch Q4. This causes the first inductor L1, the first capacitor C2, and the second capacitor C5 to form a π-shaped filter circuit, thereby removing harmonic components in the circuit. When the input signal contains a phase-cut signal, the first signal control terminal GD1 of the signal control circuit 320 outputs a low-level signal, turning off the second electronic switch Q3 and the third electronic switch Q4. This causes the first inductor L1, the first capacitor C2, the second capacitor C5, the second resistor R16, and the third resistor R19 to collectively form an RLC damping circuit, thereby preventing the thyristor conduction current from oscillating through zero, causing it to abnormally shut down.

[0066] 2. On the other hand, when the input signal has a phase-cut signal, the second signal control terminal GD2 of the signal control circuit 320 outputs a high level, turning on the first electronic switch tube Q1. Current flows through the dummy load holding circuit 310, thereby enabling the dummy load holding circuit 310 to provide a compensation current path for the thyristor, thereby preventing the thyristor from being mistakenly shut down due to insufficient holding current when the conduction angle is small or deep dimming is performed. Therefore, the stability of the intelligent control thyristor stable output circuit 10 is improved.

[0067] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. An intelligent control thyristor stable output circuit, characterized in that: It includes thyristor signal input circuit, rectifier filter circuit, intelligent control dimming module and load power supply circuit. The input end of the thyristor signal input circuit is used to connect to an external signal source, the rectifier and filter circuit includes a rectifier bridge circuit and an active damping circuit, the output end of the thyristor signal input circuit is connected to the input end of the rectifier bridge circuit, the output end of the rectifier bridge circuit is connected to the input end of the active damping circuit, and the output end of the active damping circuit is connected to the load power supply circuit; The intelligent control dimming module includes a dummy load maintenance circuit, a signal control circuit and a current stabilization circuit, and the PWM output end of the signal control circuit is connected to the PWM receiving end of the load power supply circuit; The dummy load maintaining circuit includes a first electronic switch tube and a first resistor, wherein a first end of the first resistor is connected to the output end of the rectifier bridge circuit, a second end of the first resistor is connected to the first end of the first electronic switch tube, a control end of the first electronic switch tube is connected to the second signal control end of the signal control circuit, and a second end of the first electronic switch tube is grounded; The current stabilization circuit includes a second electronic switching tube and a third electronic switching tube, a second resistor, a third resistor, a first capacitor, a second capacitor and a first inductor. The first end of the first capacitor and the first end of the first inductor are both connected to the output end of the active damping circuit, the second end of the first inductor and the first end of the second capacitor are both connected to the input end of the load power supply circuit, the second end of the first capacitor is grounded through the second resistor, the second end of the second capacitor is grounded through the third resistor, the first end of the second electronic switching tube is connected to the first end of the second resistor, the first end of the third electronic switching tube is connected to the first end of the third resistor, the second end of the second electronic switching tube and the second end of the third electronic switching tube are grounded, and the control end of the second electronic switching tube and the control end of the third electronic switching tube are both connected to the first signal control end of the signal control circuit.

2. The intelligent control thyristor stable output circuit according to claim 1, characterized in that: The intelligent control dimming module also includes a small board load maintenance circuit, which includes a fourth electronic switch tube and a fourth resistor. The control end of the fourth electronic switch tube is connected to the third signal control end of the signal control circuit, the first end of the fourth electronic switch tube is connected to the output end of the rectifier bridge circuit, and the second end of the fourth electronic switch tube is grounded through the fourth resistor.

3. The intelligent control thyristor stable output circuit according to claim 1, characterized in that: The current stabilization circuit further includes a fifth resistor, a first end of the fifth resistor being connected to the first end of the first inductor, and a second end of the fifth resistor being connected to the second end of the first inductor.

4. The intelligent control thyristor stable output circuit according to claim 1, characterized in that: The dummy load maintaining circuit further includes a sixth resistor, a first end of the sixth resistor is connected to the control end of the first electronic switch tube, and a second end of the sixth resistor is grounded.

5. The intelligent control thyristor stable output circuit according to claim 1, characterized in that: The signal control circuit includes a main control chip and a first signal control circuit. The first signal control circuit includes a seventh resistor and a fifth electronic switch tube. The first end of the seventh resistor is connected to an external power supply, the second end of the seventh resistor and the first signal control end of the signal control circuit are connected to the first end of the fifth electronic switch tube, the control end of the fifth electronic switch tube is connected to the first switch signal output end of the main control chip, and the second end of the fifth electronic switch tube is grounded.

6. The intelligent controlled thyristor stable output circuit according to claim 5, characterized in that: The signal control circuit also includes a second signal control circuit, which includes an eighth resistor and a sixth electronic switch tube. The first end of the eighth resistor is connected to an external power supply, the second end of the eighth resistor and the second signal control end of the signal control circuit are connected to the first end of the sixth electronic switch tube, the control end of the sixth electronic switch tube is connected to the second switch signal output end of the main control chip, and the second end of the sixth electronic switch tube is grounded.

7. The intelligent controlled thyristor stable output circuit according to claim 5, characterized in that: The signal control circuit also includes a third signal control circuit, which includes a ninth resistor and a seventh electronic switch tube. The first end of the ninth resistor is connected to an external power supply, the second end of the ninth resistor and the third signal control end of the signal control circuit are connected to the first end of the seventh electronic switch tube, the control end of the seventh electronic switch tube is connected to the third switch signal output end of the main control chip, and the second end of the seventh electronic switch tube is grounded.

8. The intelligent controlled thyristor stable output circuit according to claim 1, characterized in that: The thyristor signal input circuit includes a thyristor dimmer and an EMI filter circuit. The input end of the thyristor dimmer is used to connect to an external power supply, the output end of the thyristor dimmer is connected to the input end of the EMI filter circuit, and the output end of the EMI filter circuit is connected to the rectifier filter circuit.

9. The intelligent controlled thyristor stable output circuit according to claim 1, characterized in that: The load power supply circuit includes a flyback circuit and a DC transformer circuit. The input end of the flyback circuit is connected to the output end of the rectifier and filter circuit. The input end of the DC transformer circuit is connected to the output end of the flyback circuit. The output end of the DC transformer circuit is used to connect to the LED load.

10. A dimming driver, characterized in that: The invention comprises the intelligent control thyristor stable output circuit as described in any one of claims 1 to 9.

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