Voltage regulation system and PCB

Abstract

The embodiment of the utility model provides a voltage regulation system and a PCB, and relates to the technical field of electronic circuits. The voltage regulation system comprises an input filter circuit, a rectification circuit, a flyback peak absorption circuit, a flyback conversion circuit, an output rectification filter circuit, a PFC circuit, a master control circuit, an NFC circuit, a signal feedback circuit and a dimming circuit. Wherein the input filter circuit, the rectification circuit, the flyback peak absorption circuit, the flyback conversion circuit and the output rectification filter circuit are connected in sequence; the main control circuit is respectively connected with the input filter circuit, the PFC circuit, the flyback peak absorption circuit, the flyback conversion circuit and the signal feedback circuit; wherein the NFC circuit is respectively connected with the output rectification filter circuit, the signal feedback circuit and the dimming circuit. The implementation of the utility model provides a hardware basis for NFC control for voltage regulation, can effectively reduce the cost, and improves the flexibility of voltage regulation.

Description

Technical Field

[0001] This disclosure relates to the field of electronic circuit technology, and more specifically, to a voltage regulation system and a PCB board. Background Technology

[0002] In existing voltage regulation schemes, the voltage is typically adjusted manually using a potentiometer or by inputting data via the front panel or a remote interface. However, these existing schemes require additional components, resulting in high costs and very low flexibility. Utility Model Content

[0003] This disclosure provides a voltage regulation system and a PCB board to solve at least one of the above-mentioned technical problems. The technical solution is as follows:

[0004] In a first aspect, embodiments of this disclosure provide a voltage regulation system, including: an input filter circuit, a rectifier circuit, a flyback spike absorption circuit, a flyback converter circuit, an output rectifier filter circuit, a PFC circuit, a main control circuit, an NFC circuit, a signal feedback circuit, and a dimming circuit;

[0005] The input filter circuit, the rectifier circuit, the flyback spike absorption circuit, the flyback converter circuit, and the output rectifier filter circuit are connected in sequence; the main control circuit is connected to the input filter circuit, the PFC circuit, the flyback spike absorption circuit, the flyback converter circuit, and the signal feedback circuit, respectively.

[0006] The NFC circuit is connected to the output rectifier and filter circuit, the signal feedback circuit, and the dimming circuit, respectively.

[0007] In one feasible embodiment, the NFC circuit includes the following interface:

[0008] An interface connected to the positive output voltage port of the output rectifier and filter circuit;

[0009] An interface connected to the negative terminal of the output voltage of the output rectifier and filter circuit is used to acquire the sampling current;

[0010] An interface connected to the PWM signal terminal of the dimming circuit;

[0011] The interface connected to the interface VS of the signal feedback circuit is used to acquire the sampling voltage;

[0012] The interface connected to the interface fb of the signal feedback circuit.

[0013] In one feasible embodiment, the voltage regulation system further includes a short-circuit protection circuit;

[0014] The short-circuit protection circuit is connected to the signal feedback circuit and the output rectifier and filter circuit, respectively; the signal feedback circuit is connected to the main control circuit through an optocoupler.

[0015] In one feasible embodiment, the short-circuit protection circuit includes an amplifier;

[0016] The amplifier has its inverting input and negative power supply terminals grounded, its non-inverting input terminal connected to the interface IS of the output rectifier and filter circuit, its positive power supply terminal grounded, and its output terminal connected to the first terminal of the third transistor. The second terminal of the third transistor is connected to the signal feedback circuit, and its third terminal is grounded.

[0017] In one feasible embodiment, the dimming circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a first capacitor, a first transistor, and a second transistor;

[0018] Wherein, the first end of the first resistor is connected to the PWM signal terminal, and the second end is connected to the first terminal of the first transistor and the first end of the second resistor; the second terminal of the first transistor is connected to the second end of the third resistor, the first end of the fourth resistor, the negative terminal of the second diode, and the first terminal of the second transistor; the first end of the third resistor is connected to the negative terminal of the first diode, the first end of the fifth resistor, the first end of the first capacitor, and the positive terminal of the output voltage of the output rectifier filter circuit; the second terminal of the second transistor is connected to the positive terminal of the first diode, the second end of the fifth resistor, the second end of the first capacitor, and the negative terminal connected to the LED; the second end of the second resistor, the third terminal of the first transistor, the second end of the fourth resistor, the positive terminal of the first diode, and the third terminal of the second transistor are connected to the output rectifier filter circuit through interface IS.

[0019] In one feasible embodiment, the voltage regulation system further includes a segmented boost circuit and a light-load-activated PFC circuit;

[0020] The segmented boost circuit is connected to the rectifier circuit and the PFC circuit respectively, and the light-load-activated PFC circuit is connected to the PFC circuit and the main control circuit respectively.

[0021] In one feasible embodiment, the PFC circuit includes a control chip, a first interface of the control chip is connected to the input voltage port, a second interface is connected to the input voltage port through a converter, a third interface is connected to the light-load-on PFC circuit, and a fourth interface is connected to the first node HV of the flyback spike absorption circuit and the second node HV of the output rectifier filter circuit.

[0022] In one feasible embodiment, the fourth interface of the control chip is connected to the first terminal of the fifth transistor, the second terminal of the fifth transistor is connected to the first node HV of the flyback spike absorption circuit and the second node HV of the output rectifier filter circuit; the fifth interface of the control chip is grounded to the first and third terminals of the fifth transistor.

[0023] In one feasible embodiment, the light-load turn-on PFC circuit includes a third diode, a fourth diode, a fifth diode, a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, and a third capacitor.

[0024] In this circuit, the negative terminal of the third diode is connected to the control chip of the PFC circuit, and the positive terminal is connected to the first terminal of the third transistor; the second terminal of the third transistor is connected to the second terminal of the sixth resistor, the first terminal of the second capacitor, and the negative terminal of the fourth diode; the third terminal of the third transistor is connected to the first terminal of the sixth resistor and the second terminal of the eighth resistor; the positive terminal of the fourth diode is connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is connected to the target interface DEM in the main control chip of the main control circuit; the first terminal of the eighth resistor is connected to the first terminal of the fourth transistor; the third terminal of the fourth transistor is connected to the first terminals of the ninth and tenth resistors; the second terminal of the tenth resistor is connected to the first terminal of the third capacitor and the negative terminal of the fifth diode; the positive terminal of the fifth diode is connected to the first terminals of the eleventh and twelfth resistors; the second terminal of the twelfth resistor is connected to the target interface DEM in the main control chip; and the second terminal of the second capacitor, the second terminal of the fourth transistor, the second terminal of the ninth resistor, the second terminal of the third capacitor, and the second terminal of the eleventh resistor are grounded.

[0025] Secondly, embodiments of this disclosure provide a PCB board, characterized in that the PCB board includes a voltage regulation system as described in the first aspect and any of its embodiments.

[0026] The beneficial effects of the technical solutions provided in this disclosure are:

[0027] In a first aspect, embodiments of this disclosure provide a voltage regulation system, specifically including an input filter circuit, a rectifier circuit, a flyback spike absorption circuit, a flyback converter circuit, an output rectifier filter circuit, a PFC circuit, a main control circuit, an NFC circuit, a signal feedback circuit, and a dimming circuit. The input filter circuit, rectifier circuit, flyback spike absorption circuit, flyback converter circuit, and output rectifier filter circuit are connected sequentially. The main control circuit is connected to the input filter circuit, PFC circuit, flyback spike absorption circuit, flyback converter circuit, and signal feedback circuit. The NFC circuit is connected to the output rectifier filter circuit, signal feedback circuit, and dimming circuit. This disclosure provides a voltage regulation system configured with an NFC circuit, providing the hardware foundation for implementing NFC functionality. For example, it allows users to send signals for voltage regulation via the NFC circuit to complete voltage regulation. This solution requires no additional components, effectively reducing costs and improving the flexibility of voltage regulation.

[0028] In a second aspect, embodiments of this disclosure also provide a PCB board that includes the voltage regulation system described in the first aspect. The voltage regulation system achieves voltage regulation by deploying an NFC circuit, eliminating the need for additional components. This effectively reduces the space occupied by the PCB board, lowers costs, and improves the flexibility of voltage regulation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below.

[0030] Figure 1 A circuit diagram of a voltage regulation system provided in this disclosure embodiment;

[0031] Figure 2 A schematic diagram of an input filtering circuit provided in an embodiment of this disclosure;

[0032] Figure 3 A schematic diagram of a rectifier circuit and a flyback spike absorption circuit provided for embodiments of this disclosure;

[0033] Figure 4 A schematic diagram of a flyback converter circuit provided in an embodiment of this disclosure;

[0034] Figure 5 A schematic diagram of an output rectifier filter circuit provided in an embodiment of this disclosure;

[0035] Figure 6 A schematic diagram of a main control circuit provided in an embodiment of this disclosure;

[0036] Figure 7 A schematic diagram of a short-circuit protection circuit provided in an embodiment of this disclosure;

[0037] Figure 8 A schematic diagram of a signal feedback circuit provided in an embodiment of this disclosure;

[0038] Figure 9 A schematic diagram of a dimming circuit provided in an embodiment of this disclosure;

[0039] Figure 10 A schematic diagram of a PFC circuit and a segmented boost circuit provided for an embodiment of this disclosure;

[0040] Figure 11 This is a schematic diagram of a light-load-activated PFC circuit provided in an embodiment of this disclosure. Detailed Implementation

[0041] The embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this disclosure, and do not constitute a limitation on the technical solutions of the embodiments of this disclosure.

[0042] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this disclosure mean that the corresponding feature can be implemented as the illustrated feature, element, and / or component, but do not exclude implementation as other features, elements, components, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element are connected through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”

[0043] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0044] The following description of several exemplary embodiments illustrates the technical solutions of this disclosure and the technical effects produced by these solutions. It should be noted that the following embodiments can be referenced, learned from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0045] The following is combined with Figures 1 to 11The voltage regulation system provided in the embodiments of this disclosure will be described.

[0046] Specifically, such as Figure 1 As shown, the voltage regulation system includes an input filter circuit (such as an EMI filter circuit), a rectifier circuit, a PFC (Power Factor Correction) circuit, a flyback spike absorption circuit, a flyback converter circuit, an output rectifier filter circuit, a main control circuit, an NFC circuit, a signal feedback circuit, and a dimming circuit.

[0047] The input filter circuit, rectifier circuit, flyback spike absorption circuit, flyback converter circuit, and output rectifier filter circuit are connected in sequence; the main control circuit is connected to the input filter circuit, PFC circuit, flyback spike absorption circuit, flyback converter circuit, and signal feedback circuit, respectively.

[0048] The NFC circuit is connected to the output rectifier and filter circuit, the signal feedback circuit, and the dimming circuit, respectively.

[0049] Optionally, the dimming circuit is connected to the output voltage terminal of the output rectifier and filter circuit, and connected to the NFC circuit through the PWM signal terminal.

[0050] The NFC circuit provided in this embodiment can also be used to receive signals from external devices and send them to the main control circuit to adjust the output voltage.

[0051] In a feasible implementation, such as Figure 1 , Figure 7 , Figure 8 and Figure 9 As shown, the NFC circuit includes the following interfaces:

[0052] The interface connected to the positive output voltage port VOUT+ of the output rectifier and filter circuit;

[0053] The interface connected to the negative output voltage port VOUT- (shown as IS in the figure) of the output rectifier and filter circuit is used to obtain the sampling current through the sampling resistor R44 connected to the negative output voltage port in the output rectifier and filter circuit.

[0054] The interface that connects to the PWM signal terminal of the dimming circuit;

[0055] The interface connected to the signal feedback circuit VS is used to acquire the sampled voltage;

[0056] The interface that connects to the signal feedback circuit interface fb.

[0057] In this embodiment of the disclosure, the NFC circuit can use the MCU to detect the sampling voltage VS of the drive output and the sampling current IS of the sampling resistor R44, and automatically calibrate the output voltage of its driver (which is an adjustable output signal). The output voltage can be dynamically adjusted and generated according to feedback control (such as sampling voltage VS and sampling current IS) to drive the load (such as LED), which is an adjustable output signal.

[0058] In one example, the NFC circuit can output PWM signals to an external circuit (such as a dimming circuit) through PWM ports (such as PWM1 and PWM2) to achieve brightness adjustment.

[0059] In one example, interface fb is used to transmit a reference voltage signal, which is used to provide a stable voltage reference signal for other parts of the circuit.

[0060] Optionally, the parameters can be reset via NFC connection using other devices (e.g., near the NFC control circuit) to ensure power supply output stability. For example, the output voltage, theoretical output voltage range, sampling current, load limits, and driver protection can be set.

[0061] Optional, Figure 1 The diagram illustrates two dimming circuits. Each dimming circuit can use the same circuit structure and can be composed of resistors, diodes, transistors, capacitors, etc. Figure 9 The dimming circuit shown is used as an example for explanation. The dimming circuit includes a first resistor R54, a second resistor R55, a first transistor Q5, a third resistor R56, a fourth resistor R57, a first diode D17, a second diode D21, a fifth resistor R67, a second transistor Q6, and a first capacitor C3.

[0062] Specifically, the first terminal of the first resistor R54 is connected to the PWM signal terminal, and the second terminal is connected to the first terminal of the first transistor Q5 and the first terminal of the second resistor R55. The second terminal of the first transistor Q5 is connected to the second terminal of the third resistor R56, the first terminal of the fourth resistor R57, the negative terminal of the second diode D21, and the first terminal of the second transistor Q6. The first terminal of the third resistor R56 is connected to the negative terminal of the first diode D17, the first terminal of the fifth resistor R67, the first terminal of the first capacitor C3, and the positive terminal VOUT+ of the output voltage of the output rectifier filter circuit. The second terminal of the second transistor Q6 is connected to the positive terminal of the first diode D17, the second terminal of the fifth resistor R67, the second terminal of the first capacitor C3, and the negative terminal LED1- connected to the LED. The second terminal of the second resistor R55, the third terminal of the first transistor Q5, the second terminal of the fourth resistor R57, the positive terminal of the first diode D21, and the third terminal of the second transistor Q6 are connected to the output rectifier filter circuit through interface IS.

[0063] In one feasible embodiment, the voltage regulation system further includes a short-circuit protection circuit (such as...). Figure 7 As shown), signal feedback circuit (such as) Figure 8 (As shown).

[0064] The short-circuit protection circuit is connected to the signal feedback circuit and the output rectifier and filter circuit respectively. The signal feedback circuit is connected to the main control circuit through an optocoupler.

[0065] Optionally, a signal feedback circuit can be used for signal feedback, and the signal feedback circuit is connected to the main control circuit via an optocoupler. For example, such as... Figure 8 As shown, the optocoupler U1A in the signal feedback circuit feeds back a signal to the optocoupler U1B connected to pin 2 of the main control chip U3 in the main control circuit, which enables the main control chip U3 to adjust the output voltage according to the acquired signal.

[0066] In one example, the NFC circuit can receive and process external NFC signals. The signal feedback circuit can control the circuit state by monitoring circuit parameters and feeding them back to the main control circuit via an optocoupler.

[0067] Optionally, the short-circuit protection circuit includes amplifier U5. The inverting input and negative power supply terminals of amplifier U5 are grounded, the non-inverting input is connected to the interface IS of the output rectifier filter circuit, the positive power supply terminal is grounded, and the output is connected to the first terminal of the third transistor Q7. The second terminal of the third transistor Q7 is connected to the signal feedback circuit, and the third terminal is grounded. For example, amplifier U5 can be used with external components such as diodes, resistors, capacitors, and transistors to achieve control; its circuit connection relationship can be referenced. Figure 7 .

[0068] In one feasible embodiment, the voltage regulation system further includes a segmented boost circuit (such as...) Figure 10 (as shown) and light-load turn-on PFC circuit (such as Figure 11 (As shown). Among them, the segmented boost circuit is connected to the rectifier circuit and the PFC circuit respectively, and the light-load start-up PFC circuit is connected to the PFC circuit and the main control circuit respectively.

[0069] Optionally, the PFC circuit includes a control chip U4. The first interface FB of the control chip U4 is connected to VIN+ (input voltage port), the second interface ZCD is connected to VIN+ through converter T2, the third interface VCC is connected to the light-load turn-on PFC circuit (such as interface PFC VCC), and the fourth interface GATE is connected to the first node HV of the flyback spike absorption circuit and the second node HV of the output rectifier filter circuit.

[0070] For example, the fourth interface GATE of the control chip U4 is connected to the first terminal of the fifth transistor Q2, and the second terminal of the fifth transistor Q2 is connected to the first node HV of the flyback peak absorption circuit and the second node HV of the output rectifier filter circuit. The fifth interface CS of the control chip U4 is grounded along with the first and third terminals of the fifth transistor Q2.

[0071] In this embodiment, the first module includes a control chip U4 and peripheral circuitry (such as a circuit composed of capacitors, resistors, and diodes). The connection relationship between the control chip U4 and each peripheral component can be found by referring to... Figure 10 .

[0072] Optionally, the light-load turn-on PFC circuit includes a third diode D15, a fourth diode D14, a fifth diode D16, a third transistor Q3, a fourth transistor Q4, a sixth resistor R48, a seventh resistor R47, an eighth resistor R49, a ninth resistor R53, a tenth resistor R50, an eleventh resistor R52, a twelfth resistor R51, a second capacitor C39, and a third capacitor C40.

[0073] Specifically, the negative terminal of the third diode D15 is connected to the control chip U4 of the first module (e.g., via interface PFCVCC), and the positive terminal is connected to the first terminal of the third transistor Q3; the second terminal of the third transistor Q3 is connected to the second terminal of the sixth resistor R48, the first terminal of the second capacitor C39, and the negative terminal of the fourth diode D14; the third terminal of the third transistor Q3 is connected to the first terminal of the sixth resistor R48 and the second terminal of the eighth resistor R49; the positive terminal of the fourth diode D14 is connected to the first terminal of the seventh resistor R47, and the second terminal of the seventh resistor R47 (e.g., the terminal connected to interface DEM) is connected to the target interface DEM in the main control chip U3 of the main control circuit; the eighth resistor R49... The first terminal is connected to the first terminal of the fourth transistor Q4; the third terminal of the fourth transistor Q4 is connected to the first terminals of the ninth resistor R53 and the tenth resistor R50; the second terminal of the tenth resistor R50 is connected to the first terminal of the third capacitor C40 and the negative terminal of the fifth diode D16; the positive terminal of the fifth diode D16 is connected to the first terminals of the eleventh resistor R52 and the twelfth resistor R51; the second terminal of the twelfth resistor R51 (such as the terminal connected to the interface DEM) is connected to the target interface DEM in the main control chip U3; the second terminal of the second capacitor C39, the second terminal of the fourth transistor Q4, the second terminal of the ninth resistor R53, the second terminal of the third capacitor C40, and the second terminal of the eleventh resistor R52 are grounded. Figure 1 , Figure 6 and Figure 11 The four interfaces shown in the diagram are connected to form a network.

[0074] In this embodiment of the disclosure, the provided voltage regulation system can adopt a 90-264Vac, 50 / 60Hz AC input.

[0075] In the input filtering circuit provided in the embodiments of this disclosure, such as Figure 2 As shown, an EMI (Electromagnetic Interference) filter circuit structure can be adopted, which may include components such as fuse F1, varistor VR1, capacitor C6, filter inductor LF2, and filter inductor LF3. The connection relationship between the components can be... Figure 1 and Figure 2 .

[0076] In the rectifier circuit provided in the embodiments of this disclosure, such as Figure 3 As shown, it may include a rectifier bridge DB1, an input voltage port VIN+ (the first node of the rectifier circuit), capacitors, resistors, etc., and their connection relationship can be adopted. Figure 3 The DB1 rectifier bridge uses four diodes to form the rectifier section of the rectifier circuit, while capacitors, resistors, inductors, and other components work together to form the filter section. The rectifier section is used to rectify the input AC voltage into DC voltage to supply the flyback spike absorption circuit, and the filter section is used to filter out interference signals in the rectified DC voltage.

[0077] The flyback spike absorption circuit provided in this embodiment may include diodes, capacitors, resistors, etc., and their connection relationships are as follows: Figure 3 As shown. Optionally, it can be connected to the PFC circuit via node HV.

[0078] In the flyback converter circuit provided in the embodiments of this disclosure, such as Figure 4 As shown, the circuit may include a transformer T1 and a capacitor C43. The first terminal (pin 3) of the first primary winding of transformer T1 is connected to transistor Q1 (the switching transistor) of the main control circuit; the second terminal (pin 1) of the first primary winding of transformer T1 is connected to the output terminal of the rectifier circuit. Specifically, capacitor C20 in the rectifier circuit can be considered as an electrolytic capacitor of the first primary winding of transformer T1, used to filter out AC components in the circuit, stabilize the input voltage of transformer T1, thereby ensuring the stability of the output voltage of the secondary winding of transformer T1 and achieving flicker-free output. Pin 4 of the second primary winding of transformer T1 is connected to the main control chip U3 of the main control circuit, and pin 5 of the second primary winding of transformer T1 is grounded.

[0079] In the output rectifier and filter circuit provided in the embodiments of this disclosure, such as Figure 5 As shown, it can be connected to the PFC circuit via node HV, while the positive output voltage port VOUT+ and the negative output voltage port IS (such as VOUT-) can be connected to the NFC circuit.

[0080] This public embodiment also provides a PCB board that includes the voltage regulation system provided in the above embodiments.

[0081] This disclosure provides a voltage regulation system equipped with an NFC circuit, providing the hardware foundation for implementing NFC functionality. It enables users to send signals for voltage regulation via the NFC circuit to complete voltage adjustment. Furthermore, the voltage regulation system achieves voltage regulation through the NFC circuit, eliminating the need for additional components (such as potentiometers), effectively reducing PCB board space requirements, lowering costs, and improving the flexibility of voltage regulation.

[0082] The terms “first,” “second,” “third,” “fourth,” “first pole,” “second pole,” “third pole,” “1,” “2,” etc. (if present) in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe specific objects, sequences, or order. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in a sequence other than that shown in the figures or text.

[0083] The above description is only a partial embodiment of this disclosure. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure.

Claims

1. A voltage regulation system, characterized in that, include: Input filter circuit, rectifier circuit, flyback spike absorption circuit, flyback converter circuit, output rectifier filter circuit, PFC circuit, main control circuit, NFC circuit, signal feedback circuit and dimming circuit; The input filter circuit, the rectifier circuit, the flyback spike absorption circuit, the flyback converter circuit, and the output rectifier filter circuit are connected in sequence; the main control circuit is connected to the input filter circuit, the PFC circuit, the flyback spike absorption circuit, the flyback converter circuit, and the signal feedback circuit, respectively. The NFC circuit is connected to the output rectifier and filter circuit, the signal feedback circuit, and the dimming circuit, respectively.

2. The voltage regulation system according to claim 1, characterized in that, The NFC circuit includes the following interfaces: An interface connected to the positive output voltage port of the output rectifier and filter circuit; An interface connected to the negative output voltage port of the output rectifier and filter circuit is used to obtain the sampling current through the sampling resistor connected to the negative output voltage port in the output rectifier and filter circuit. An interface connected to the PWM signal terminal of the dimming circuit; The interface connected to the interface VS of the signal feedback circuit is used to acquire the sampling voltage; The interface connected to the interface fb of the signal feedback circuit.

3. The voltage regulation system according to claim 2, characterized in that, The voltage regulation system also includes a short-circuit protection circuit; The short-circuit protection circuit is connected to the signal feedback circuit and the output rectifier and filter circuit, respectively; the signal feedback circuit is connected to the main control circuit through an optocoupler.

4. The voltage regulation system according to claim 3, characterized in that, The short-circuit protection circuit includes an amplifier; The amplifier has its inverting input and negative power supply terminals grounded, its non-inverting input terminal connected to the interface IS of the output rectifier and filter circuit, its positive power supply terminal grounded, and its output terminal connected to the first terminal of the third transistor. The second terminal of the third transistor is connected to the signal feedback circuit, and its third terminal is grounded.

5. The voltage regulation system according to any one of claims 2 to 4, characterized in that, The dimming circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a first capacitor, a first transistor, and a second transistor; Wherein, the first end of the first resistor is connected to the PWM signal terminal, and the second end is connected to the first terminal of the first transistor and the first end of the second resistor; the second terminal of the first transistor is connected to the second end of the third resistor, the first end of the fourth resistor, the negative terminal of the second diode, and the first terminal of the second transistor; the first end of the third resistor is connected to the negative terminal of the first diode, the first end of the fifth resistor, the first end of the first capacitor, and the positive terminal of the output voltage of the output rectifier filter circuit; the second terminal of the second transistor is connected to the positive terminal of the first diode, the second end of the fifth resistor, the second end of the first capacitor, and the negative terminal connected to the LED; the second end of the second resistor, the third terminal of the first transistor, the second end of the fourth resistor, the positive terminal of the first diode, and the third terminal of the second transistor are connected to the output rectifier filter circuit through interface IS.

6. The voltage regulation system according to claim 1, characterized in that, The voltage regulation system also includes a segmented boost circuit and a light-load-activated PFC circuit. The segmented boost circuit is connected to the rectifier circuit and the PFC circuit respectively, and the light-load-activated PFC circuit is connected to the PFC circuit and the main control circuit respectively.

7. The voltage regulation system according to claim 6, characterized in that, The PFC circuit includes a control chip. The first interface of the control chip is connected to the input voltage port, the second interface is connected to the input voltage port through a converter, the third interface is connected to the light-load-on PFC circuit, and the fourth interface is connected to the first node HV of the flyback spike absorption circuit and the second node HV of the output rectifier filter circuit.

8. The voltage regulation system according to claim 7, characterized in that, The fourth interface of the control chip is connected to the first terminal of the fifth transistor, and the second terminal of the fifth transistor is connected to the first node HV of the flyback spike absorption circuit and the second node HV of the output rectifier filter circuit; the fifth interface of the control chip is grounded to the first and third terminals of the fifth transistor.

9. The voltage regulation system according to claim 6 or 7, characterized in that, The light-load turn-on PFC circuit includes a third diode, a fourth diode, a fifth diode, a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, and a third capacitor. In this circuit, the negative terminal of the third diode is connected to the control chip of the PFC circuit, and the positive terminal is connected to the first terminal of the third transistor; the second terminal of the third transistor is connected to the second terminal of the sixth resistor, the first terminal of the second capacitor, and the negative terminal of the fourth diode; the third terminal of the third transistor is connected to the first terminal of the sixth resistor and the second terminal of the eighth resistor; the positive terminal of the fourth diode is connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is connected to the target interface DEM in the main control chip of the main control circuit; the first terminal of the eighth resistor is connected to the first terminal of the fourth transistor; the third terminal of the fourth transistor is connected to the first terminals of the ninth and tenth resistors; the second terminal of the tenth resistor is connected to the first terminal of the third capacitor and the negative terminal of the fifth diode; the positive terminal of the fifth diode is connected to the first terminals of the eleventh and twelfth resistors; the second terminal of the twelfth resistor is connected to the target interface DEM in the main control chip; and the second terminal of the second capacitor, the second terminal of the fourth transistor, the second terminal of the ninth resistor, the second terminal of the third capacitor, and the second terminal of the eleventh resistor are grounded.

10. A PCB board, characterized in that, The PCB board includes a voltage regulation system as described in any one of claims 1 to 9.

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