AC input power supply circuit

Abstract

The embodiment of the utility model provides an alternating current input power supply circuit. The alternating current input power supply circuit comprises at least one live wire input end; a zero line input end; the lightning surge protection circuit comprises a first fuse, wherein one end of the first fuse is coupled with the other end of the live wire input end; one end of the second fuse is coupled with the other end of the zero line input end; one end of the adjustable resistor is coupled with one end of the live wire input end, and the other end is coupled with the other end of the second fuse; the output end of the lightning surge protection circuit is coupled with the first end of the primary side coil; the power supply access end of the power supply chip is coupled with the second end; the power supply end is coupled with the third end through a power supply circuit; the feedback end is coupled with a feedback circuit; the grounding end is grounded; the over-current detection end is coupled with an over-current detection circuit; the output circuit is coupled to the secondary coil. According to the invention, by arranging the lightning surge protection circuit, the lightning surge voltage is effectively absorbed and suppressed, and the power supply circuit and the connection equipment are protected from overvoltage impact.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cloud platform big data processing, and in particular to an AC input power supply circuit. Background Art

[0002] In practical applications, existing AC input power circuits often face problems such as lightning surges, overload current, and power fluctuations. These problems may not only cause damage to the power system itself, but may also affect the normal operation and life of the electrical equipment connected to it.

[0003] Although traditional power supply circuits have certain protection functions to a certain extent, their protection effect and adaptability still need to be improved when dealing with complex and changeable power environments. Specifically, when the existing AC input power supply circuit encounters a lightning surge, it is often easy for the components in the circuit to burn out due to instantaneous overvoltage due to the lack of targeted protection measures. At the same time, due to the frequent fluctuations in grid voltage, the occurrence of overload current is also a common phenomenon. If it is not effectively controlled, it will also cause damage to the power supply circuit and load equipment.

[0004] In addition, power fluctuations not only affect the stable output of the power supply itself, but may also cause abnormal operation of electronic equipment connected to it, or even cause system failure. Therefore, there is an urgent need for a new type of AC input power circuit that can provide all-round protection and stable power output in complex power environments such as lightning surges, overload currents, and power fluctuations. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide an AC input power supply circuit to solve the problems in the related art.

[0006] A first aspect of the present disclosure provides an AC input power supply circuit, characterized by comprising:

[0007] At least one live wire input terminal, one end of which is connected to an external power supply;

[0008] A zero line input terminal, one end of which is grounded;

[0009] At least one lightning surge protection circuit, wherein an input terminal of one of the at least one lightning surge protection circuits is coupled to the other end of one of the at least one live line input terminal and / or the other end of the neutral line input terminal;

[0010] One of the at least one lightning surge protection circuits comprises:

[0011] A first fuse, one end of the first fuse being coupled to the other end of the live wire input end;

[0012] a second fuse, one end of the second fuse being coupled to the other end of the neutral line input end;

[0013] an adjustable resistor, one end of the adjustable resistor being coupled to one end of the live wire input end, and the other end of the adjustable resistor being coupled to the other end of the second fuse;

[0014] A transformer, the transformer comprising a primary coil, an auxiliary coil and at least one secondary coil; the primary coil comprises a first end and a second end; the auxiliary coil comprises a third end and a fourth end;

[0015] The output end of the lightning surge protection circuit is coupled to the first end;

[0016] A power chip, the power chip comprising a power access terminal, a power supply terminal, a feedback terminal, an overcurrent detection terminal and a ground terminal;

[0017] The power supply access terminal is coupled to the second terminal; the power supply terminal is coupled to the third terminal through a power supply circuit; the feedback terminal is coupled to a feedback circuit; the ground terminal is grounded; and the overcurrent detection terminal is coupled to an overcurrent detection circuit;

[0018] At least one output circuit, one of the at least one output circuit is coupled to one of the at least one secondary coil; and an output end of the output circuit is connected to an external load.

[0019] In an embodiment of the first aspect, an interference suppression circuit is further provided between the lightning surge protection circuit and the transformer, and the interference suppression circuit includes:

[0020] A first capacitor, one end of the first capacitor is coupled to the at least one live line input end through a three-phase rectifier bridge; the other end of the first capacitor is coupled to the neutral line input end through the three-phase rectifier bridge;

[0021] a first resistor, one end of the first resistor being coupled to one end of the first capacitor, and the other end of the first resistor being coupled to the other end of the first capacitor via a second resistor;

[0022] A common mode suppression inductor, the common mode suppression inductor comprises a first winding and a second winding, the first winding comprises a fifth end and a sixth end; the second winding comprises a seventh end and an eighth end; the fifth end and the seventh end are the same end;

[0023] The fifth end is coupled to the at least one live line input end through a three-phase rectifier bridge, and the seventh end is coupled to the neutral line input end through the three-phase rectifier bridge;

[0024] The sixth end is coupled to the first end; and the eighth end is grounded.

[0025] In an embodiment of the first aspect, the three-phase rectifier bridge includes: a pair of diodes adjacent to each of the live input terminals and the neutral input terminals, including:

[0026] a first diode, wherein an anode of the first diode is coupled to at least one of the live wire input terminals, and a cathode of the first diode is coupled to the fifth terminal;

[0027] A second diode, wherein an anode of the second diode is coupled to the seventh terminal, and a cathode of the second diode is coupled to at least one of the live line input terminal and / or the neutral line input terminal.

[0028] In an embodiment of the first aspect, an RCD absorption circuit is further provided between the output end of the interference suppression circuit and the transformer, and the RCD absorption circuit includes:

[0029] A first voltage stabilizing diode, wherein an anode of the first voltage stabilizing diode is coupled to the sixth end;

[0030] a third diode, wherein an anode of the third diode is coupled to the power supply access terminal, and a cathode of the third diode is coupled to a cathode of the first voltage regulator diode;

[0031] a third resistor, one end of the third resistor is coupled to the first end, the other end of the third resistor is coupled to the cathode of the third diode, and the second resistor is connected in parallel with the first voltage regulator diode;

[0032] A second capacitor is connected in parallel with the third resistor.

[0033] In an embodiment of the first aspect, an input energy storage filter circuit is further provided between the output end of the interference suppression circuit and the transformer, and the input energy storage filter circuit includes:

[0034] A first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to the sixth end;

[0035] a second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to a negative electrode of the first energy storage filter capacitor, and a negative electrode of the second energy storage filter capacitor is coupled to the eighth terminal;

[0036] a fourth resistor, one end of the fourth resistor being coupled to the positive electrode of the first energy storage filter capacitor, and the other end of the fourth resistor being coupled to the negative electrode of the first energy storage filter capacitor through a fifth resistor;

[0037] A sixth resistor, one end of the sixth resistor is coupled to the positive electrode of the second energy storage filter capacitor, and the other end of the sixth resistor is coupled to the negative electrode of the second energy storage filter capacitor through a seventh resistor.

[0038] In an embodiment of the first aspect, the power supply circuit includes:

[0039] a fourth diode, wherein an anode of the fourth diode is coupled to the third end through an eighth resistor, and a cathode of the fourth diode is coupled to the power supply end;

[0040] A third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to the power supply end, and a negative electrode of the third energy storage filter capacitor is coupled to the fourth end.

[0041] In an embodiment of the first aspect, the at least one secondary coil includes a first secondary coil; the first secondary coil includes a ninth end and a tenth end;

[0042] The output circuit comprises a first output circuit; an input end of the first output circuit is coupled to the first secondary coil;

[0043] The feedback circuit comprises:

[0044] An optical coupling transmission component, the optical coupling transmission component comprising a receiver and a transmitter; one end of the receiver is coupled to the feedback end, and the other end of the receiver is coupled to the fourth end and / or ground;

[0045] One end of the transmitter is coupled to the ninth end through a ninth resistor;

[0046] A three-terminal parallel adjustable voltage regulator, wherein the negative electrode of the three-terminal parallel adjustable voltage regulator is grounded, and the positive electrode of the three-terminal parallel adjustable voltage regulator is coupled to the other end of the transmitter;

[0047] a feedback voltage circuit, wherein an input terminal of the feedback voltage circuit is coupled to an output terminal of the first output circuit, a ground terminal of the feedback voltage circuit is grounded, and an output terminal of the feedback voltage circuit between the input terminal and the ground terminal is coupled to a reference terminal of the three-terminal parallel adjustable regulator to output a feedback voltage;

[0048] a tenth resistor, wherein one end of the tenth resistor is coupled to the ninth resistor, and the other end of the ninth resistor is coupled to the other end of the transmitter;

[0049] A third capacitor, one end of the third capacitor is coupled to the positive electrode of the three-terminal parallel adjustable regulator, and the other end of the third capacitor is coupled to the output end of the feedback voltage circuit between the input end and the ground end through an eleventh resistor.

[0050] In an embodiment of the first aspect, the feedback voltage circuit includes:

[0051] a twelfth resistor, one end of the twelfth resistor being coupled to the external load, and the other end of the twelfth resistor being grounded via a thirteenth resistor and a fourteenth resistor in sequence;

[0052] A connection point between the thirteenth resistor and the fourteenth resistor leads to an output end of the feedback voltage circuit.

[0053] In an embodiment of the first aspect, the first output circuit includes:

[0054] a fifth diode, wherein an anode of the fifth diode is coupled to the ninth terminal, and a cathode of the fifth diode is coupled to the external load via a first inductor;

[0055] a fifteenth resistor, one end of the fifteenth resistor being coupled to the anode of the fifth diode, and the other end of the fifteenth resistor being coupled to the cathode of the fifth diode via a fourth capacitor;

[0056] A fourth energy storage filter capacitor, a fifth energy storage filter capacitor, a fifth capacitor and a sixteenth resistor are sequentially connected in parallel between the external load and the ground terminal;

[0057] One end of the first inductor is coupled to the fourth energy storage filter capacitor, and the other end of the first inductor is coupled to the fifth energy storage filter capacitor.

[0058] In an embodiment of the first aspect, the at least one secondary coil includes a second secondary coil; the second secondary coil includes an eleventh end and a twelfth end;

[0059] The at least one output circuit includes a second output circuit, an input end of the second output circuit is coupled to the second secondary coil; the second output circuit includes:

[0060] a sixth diode, wherein an anode of the sixth diode is coupled to the eleventh terminal;

[0061] a switch chip, wherein an input end of the switch chip is coupled to the cathode of the sixth diode, an output end of the switch chip is coupled to the external load, and a ground end of the switch chip is grounded;

[0062] a sixth energy storage filter capacitor, wherein a positive electrode of the sixth energy storage filter capacitor is coupled to the input end of the switch chip, and a negative electrode of the sixth energy storage filter capacitor is grounded;

[0063] a seventeenth resistor, one end of the seventeenth resistor being coupled to the anode of the sixth diode, and the other end of the seventeenth resistor being coupled to the cathode of the sixth diode via a sixth capacitor;

[0064] A seventh energy storage filter capacitor, a seventh inductor and an eighteenth resistor are sequentially connected in parallel between the external load and the ground terminal;

[0065] The positive electrode of the seventh energy storage filter capacitor is coupled to the output end of the switch chip.

[0066] Beneficial effects of the present disclosure: The present disclosure effectively absorbs and suppresses lightning surge voltage by setting at least one lightning surge protection circuit, thereby protecting the power supply circuit and connected equipment from overvoltage shock. The first fuse, the second fuse and the adjustable resistor in the lightning surge protection circuit work together to quickly respond to and safely release lightning surge energy, significantly improving the lightning surge protection capability of the circuit and ensuring the stable operation of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A circuit schematic diagram showing an AC input power supply circuit in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0068] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0069] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0070] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0072] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0073] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0074] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0075] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0076] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0077] The present disclosure provides an AC input power supply circuit, comprising: at least one live line input terminal (L1, L2, L3), a neutral line input terminal N, at least one lightning surge protection circuit, a transformer T, a power supply chip, and at least one output circuit;

[0078] One end of the live wire input terminal (L1, L2, L3) is connected to an external power supply;

[0079] One end of the zero line input terminal N is grounded;

[0080] An input end of one of the at least one lightning surge protection circuits is coupled to the other end of one of the at least one live line input end (L1, L2, L3) and / or the other end of the neutral line input end N;

[0081] One of the at least one lightning surge protection circuits comprises: a first fuse (F1, F2, F3), a second fuse RT1, and an adjustable resistor (RV1, RV2, RV3);

[0082] One end of the first fuse (F1, F2, F3) is coupled to the other end of the live wire input end (L1, L2, L3);

[0083] One end of the second fuse RT1 is coupled to the other end of the neutral line input terminal N;

[0084] One end of the adjustable resistor (RV1, RV2, RV3) is coupled to one end of the live wire input end (L1, L2, L3), and the other end of the adjustable resistor (RV1, RV2, RV3) is coupled to the other end of the second fuse RT1;

[0085] The transformer T comprises a primary coil, an auxiliary coil and at least one secondary coil; the primary coil comprises a first end 1 and a second end 2; the auxiliary coil comprises a third end 3 and a fourth end 4;

[0086] The output end of the lightning surge protection circuit is coupled to the first end 1;

[0087] The power chip includes a power access terminal SW, a power supply terminal VDD, a feedback terminal COMP, an overcurrent detection terminal CS and a ground terminal GND;

[0088] The power supply access terminal SW is coupled to the second terminal 2; the power supply terminal VDD is coupled to the third terminal 3 through a power supply circuit; the feedback terminal COMP is coupled to a feedback circuit; the ground terminal GND is grounded; the overcurrent detection terminal CS is coupled to an overcurrent detection circuit;

[0089] One of the at least one output circuit is coupled to one of the at least one secondary coil; and an output end of the output circuit is connected to an external load F0.

[0090] Specifically, in the prior art, when the existing AC input power circuit encounters a lightning surge, it is often easy to cause the components in the circuit to burn out due to instantaneous overvoltage due to the lack of targeted protection measures. At the same time, due to the frequent fluctuations in grid voltage, the occurrence of overload current is also a common phenomenon. If it is not effectively controlled, it will also cause damage to the power circuit and the external load F0.

[0091] In addition, power fluctuations not only affect the stable output of the power supply itself, but may also cause the electronic equipment connected to it to work abnormally or even cause system failures.

[0092] In the present disclosure, at least one lightning surge protection circuit is provided to effectively absorb and suppress lightning surge voltage, thereby protecting the power supply circuit and the connected equipment from overvoltage shock. The first fuse, the second fuse and the adjustable resistor in the lightning surge protection circuit work together to quickly respond to and safely release lightning surge energy, significantly improving the lightning surge protection capability of the circuit and ensuring the stable operation of the power supply system.

[0093] In some embodiments, the AC input power circuit includes: at least one live wire input terminal (L1, L2, L3), a neutral wire input terminal N, at least one lightning surge protection circuit, a transformer T, a power chip, and at least one output circuit.

[0094] Optionally, at least one live input terminal (L1, L2, L3) is provided, one end of which is connected to an external power supply to provide AC input for the power supply circuit. A neutral input terminal N, one end of which is grounded, together with the live input terminal (L1, L2, L3) forms a complete AC power input circuit.

[0095] Optionally, at least one lightning surge protection circuit is provided, and its input end is coupled to the other end of at least one live line input end (L1, L2, L3) or the other end of the neutral line input end N. The lightning surge protection circuit specifically includes: a first fuse (F1, F2, F3), a second fuse RT1, and an adjustable resistor (RV1, RV2, RV3).

[0096] The first fuse (F1, F2, F3) is connected to the other end of the live wire input terminal (L1, L2, L3) and is used to fuse in the case of lightning surge or overload current, cut off the current and protect the circuit components. The second fuse RT1 is connected to the other end of the neutral line input terminal N and also plays an overload protection role. One end of the adjustable resistor (RV1, RV2, RV3) is connected to the live wire input terminal (L1, L2, L3), and the other end is connected to the other end of the second fuse RT1. By adjusting the resistance value of the adjustable resistor (RV1, RV2, RV3), the protection threshold of the lightning surge protection circuit can be adjusted to adapt to different lightning surge intensities or power supply fluctuations.

[0097] The transformer T includes a primary coil, an auxiliary coil and at least one secondary coil. The first end 1 of the primary coil is connected to the output end of the lightning surge protection circuit, and the second end 2 is connected to the power access end SW of the power chip. The third end 3 of the auxiliary coil is connected to the power supply end VDD of the power chip through the power supply circuit, and the fourth end 4 is grounded. At least one secondary coil is coupled to at least one output circuit to provide a stable power output for the external load F0.

[0098] The power chip includes a power access terminal SW, a power supply terminal VDD, a feedback terminal COMP, an overcurrent detection terminal CS, and a ground terminal GND. The power access terminal SW receives the AC power after being processed by the lightning surge protection circuit, the power supply terminal VDD receives the power provided by the auxiliary coil through the power supply circuit, the feedback terminal COMP obtains the output voltage information through the feedback circuit to achieve closed-loop control, the overcurrent detection terminal CS monitors the current state in the circuit through the overcurrent detection circuit, and the ground terminal GND is grounded to ensure that the power chip works in a safe potential environment.

[0099] Optionally, in some embodiments, the power control unit may be implemented by a power control chip, such as a chip of model PN8147T and related series with similar functions, or a power control chip of other manufacturers with similar principles.

[0100] At least one output circuit, each output circuit is connected to a secondary coil, and provides the voltage converted by the transformer T to the external load F0 to ensure the normal operation of the external load F0.

[0101] Optionally, an interference suppression circuit is further provided between the lightning surge protection circuit and the transformer T, and the interference suppression circuit includes:

[0102] A first capacitor C1, one end of the first capacitor C1 is coupled to the at least one live line input end (L1, L2, L3) through a three-phase rectifier bridge; the other end of the first capacitor C1 is coupled to the neutral line input end N through the three-phase rectifier bridge;

[0103] A first resistor R1, one end of the first resistor R1 is coupled to one end of the first capacitor C1, and the other end of the first resistor R1 is coupled to the other end of the first capacitor C1 through a second resistor R2;

[0104] A common mode suppression inductor T2, the common mode suppression inductor T2 comprises a first winding and a second winding, the first winding comprises a fifth end 5 and a sixth end 6; the second winding comprises a seventh end 7 and an eighth end 8; the fifth end 5 and the seventh end 7 are the same end;

[0105] The fifth terminal 5 is coupled to the at least one live line input terminal (L1, L2, L3) through a three-phase rectifier bridge, and the seventh terminal 7 is coupled to the neutral line input terminal N through the three-phase rectifier bridge;

[0106] The sixth terminal 6 is coupled to the first terminal 1 ; the eighth terminal 8 is grounded.

[0107] Specifically, in some embodiments, the interference suppression circuit includes a first capacitor C1, a first resistor R1, a second resistor R2 and a common mode suppression inductor T2. One end of the first capacitor C1 is coupled to at least one live line input terminal (L1, L2, L3) through a three-phase rectifier bridge, and the other end is also coupled to the zero line input terminal N through a three-phase rectifier bridge. The first capacitor C1 can filter the input power supply, effectively reduce the high-frequency noise and transient interference in the power supply, so as to achieve the effect of suppressing differential mode interference. One end of the first resistor R1 is connected to one end of the first capacitor C1, and the other end is connected to the other end of the first capacitor C1 through the second resistor R2. The two resistors constitute a voltage divider network for adjusting the voltage distribution at both ends of the first capacitor C1, further suppressing interference signals, and providing a certain damping effect to improve the stability of the power supply system.

[0108] The common-mode suppression inductor T2 includes a first winding and a second winding, wherein the first winding includes a fifth terminal 5 and a sixth terminal 6, and the second winding includes a seventh terminal 7 and an eighth terminal 8, wherein the fifth terminal 5 and the seventh terminal 7 are terminals of the same name. The fifth terminal 5 is coupled to at least one live line input terminal (L1, L2, L3) through a three-phase rectifier bridge, and the seventh terminal 7 is also coupled to the neutral line input terminal N through a three-phase rectifier bridge. In this way, the common-mode suppression inductor T2 can form a low-impedance path at the power input terminal, and has a good suppression effect on common-mode interference (i.e., the interference signals on the live line and the neutral line are in phase).

[0109] The sixth end 6 of the first winding of the common mode suppression inductor T2 is connected to the first end 1 of the primary coil of the transformer T to form a power supply path. The eighth end 8 of the second winding is grounded to provide a low impedance discharge path for common mode interference, further enhancing the suppression effect of common mode interference.

[0110] Optionally, the three-phase rectifier bridge includes: a pair of diodes adjacent to each of the live line input terminals (L1, L2, L3) and the neutral line input terminal N, including:

[0111] a first diode (D1, D2, D3, D4), wherein an anode of the first diode (D1, D2, D3, D4) is coupled to at least one of the live wire input terminals (L1, L2, L3), and a cathode of the first diode (D1, D2, D3, D4) is coupled to the fifth terminal 5;

[0112] A second diode (D5, D6, D7, D8), wherein the anode of the second diode (D5, D6, D7, D8) is coupled to the seventh terminal 7, and the cathode of the second diode (D5, D6, D7, D8) is coupled to at least one of the live wire input terminals (L1, L2, L3) and / or the neutral wire input terminal N.

[0113] Optionally, in some embodiments, in order to realize the rectification of the input AC power supply, a rectifier bridge is provided. Specifically, the AC power supply can provide three-phase four-wire AC power, and the rectifier bridge is a corresponding three-phase rectifier bridge. The three-phase rectifier bridge includes a pair of diodes adjacent to each live line input terminal (L1, L2, L3) and the neutral line input terminal N, specifically including a first diode (D1, D2, D3, D4) and a second diode (D5, D6, D7, D8). The positive pole of the first diode (D1, D2, D3, D4) is coupled to at least one live line input terminal (L1, L2, L3), and the negative pole is connected to the fifth end 5 of the first winding of the common mode suppression inductor T2. When the live line voltage of the input power supply is higher than the neutral line voltage, the first diode (D1, D2, D3, D4) is turned on, and the forward voltage on the live line is transmitted to the subsequent circuit through the common mode suppression inductor T2 to realize the rectification function. The anode of the second diode (D5, D6, D7, D8) is coupled to the seventh end 7 of the second winding of the common mode suppression inductor T2, and the cathode is connected to at least one live wire input terminal (L1, L2, L3) and / or the neutral wire input terminal N.

[0114] The three-phase rectifier bridge of this embodiment utilizes a pair of diodes (a first diode (D1, D2, D3, D4) and a second diode (D5, D6, D7, D8)) to conduct alternately to convert AC power into DC power, thereby providing the required DC input for subsequent interference suppression circuits, transformer T, etc.

[0115] Optionally, an RCD absorption circuit is further provided between the output end of the interference suppression circuit and the transformer T, and the RCD absorption circuit includes:

[0116] A first voltage stabilizing diode Z1, wherein an anode of the first voltage stabilizing diode Z1 is coupled to the sixth end 6;

[0117] a third diode D9, wherein an anode of the third diode D9 is coupled to the power supply access terminal SW, and a cathode of the third diode D9 is coupled to a cathode of the first voltage stabilizing diode Z1;

[0118] a third resistor R3, one end of the third resistor R3 is coupled to the first end 1, the other end of the third resistor R3 is coupled to the cathode of the third diode D9, and the second resistor R2 is connected in parallel with the first voltage regulator diode Z1;

[0119] A second capacitor C2 is connected in parallel with the third resistor R3.

[0120] Optionally, in some embodiments, the RCD absorption circuit includes a first voltage stabilizing diode Z1, a third diode D9, a third resistor R3, and a second capacitor C2. The anode of the first voltage stabilizing diode Z1 is coupled to the sixth end 6 of the first winding of the common mode suppression inductor T2, that is, connected to the output end of the interference suppression circuit. When the voltage at the output end of the interference suppression circuit exceeds the voltage stabilizing value of the first voltage stabilizing diode Z1, the first voltage stabilizing diode Z1 is turned on, and the excess voltage is discharged to the third diode D9 through its cathode, thereby preventing the excessive voltage from causing damage to the subsequent circuit.

[0121] The anode of the third diode D9 is coupled to the power supply access terminal SW of the power chip, and the cathode is connected to the cathode of the first voltage regulator diode Z1. When the first voltage regulator diode Z1 is turned on, the third diode D9 acts as a freewheeling diode to provide a low impedance discharge path for the first voltage regulator diode Z1.

[0122] One end of the third resistor R3 is connected to the first end 1 of the primary coil of the transformer T, and the other end is connected to the cathode of the third diode D9. The third resistor R3 is connected in parallel with the first voltage zener diode Z1, and together they form the resistance part of the RCD absorption circuit, providing a certain damping effect for the first voltage zener diode Z1, preventing voltage overshoot, and improving the stability of the power supply system. The second capacitor C2 is connected in parallel with the third resistor R3, one end of which is connected to one end of the third resistor R3, and the other end is connected to the other end of the third resistor R3. As the capacitance part of the RCD absorption circuit, the second capacitor C2 can absorb and suppress the transient voltage and noise at the output end of the interference circuit.

[0123] Optionally, an input energy storage filter circuit is further provided between the output end of the interference suppression circuit and the transformer T, and the input energy storage filter circuit includes:

[0124] A first energy storage filter capacitor EC1, wherein a positive electrode of the first energy storage filter capacitor EC1 is coupled to the sixth end 6;

[0125] a second energy storage filter capacitor EC2, wherein the positive electrode of the second energy storage filter capacitor EC2 is coupled to the negative electrode of the first energy storage filter capacitor EC1, and the negative electrode of the second energy storage filter capacitor EC2 is coupled to the eighth terminal 8;

[0126] a fourth resistor R4, one end of the fourth resistor R4 is coupled to the positive electrode of the first energy storage filter capacitor EC1, and the other end of the fourth resistor R4 is coupled to the negative electrode of the first energy storage filter capacitor EC1 through a fifth resistor R5;

[0127] A sixth resistor R6, one end of the sixth resistor R6 is coupled to the positive electrode of the second energy storage filter capacitor EC2, and the other end of the sixth resistor R6 is coupled to the negative electrode of the second energy storage filter capacitor EC2 through a seventh resistor R7.

[0128] Optionally, in some embodiments, the input energy storage filter circuit includes a first energy storage filter capacitor EC1, a second energy storage filter capacitor EC2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7.

[0129] The positive electrode of the first energy storage filter capacitor EC1 is coupled to the sixth end 6 of the first winding of the common mode suppression inductor T2, that is, connected to the output end of the interference suppression circuit. The first energy storage filter capacitor EC1 is used to store and release energy. The positive electrode of the second energy storage filter capacitor EC2 is connected to the negative electrode of the first energy storage filter capacitor EC1, and the negative electrode is coupled to the eighth end 8 of the second winding of the common mode suppression inductor T2.

[0130] One end of the fourth resistor R4 is connected to the positive electrode of the first energy storage filter capacitor EC1, and the other end is connected to the negative electrode of the first energy storage filter capacitor EC1 through the fifth resistor R5. The fourth resistor R4 and the fifth resistor R5 are used to adjust the voltage distribution across the first energy storage filter capacitor EC1.

[0131] One end of the sixth resistor R6 is connected to the positive electrode of the second energy storage filter capacitor EC2, and the other end is connected to the negative electrode of the second energy storage filter capacitor EC2 through the seventh resistor R7. The sixth resistor R6 and the seventh resistor R7 are also used to adjust the voltage distribution across the second energy storage filter capacitor EC2.

[0132] Optionally, the power supply circuit includes:

[0133] a fourth diode D10, wherein an anode of the fourth diode D10 is coupled to the third terminal 3 via an eighth resistor R8, and a cathode of the fourth diode D10 is coupled to the power supply terminal VDD;

[0134] A third energy storage filter capacitor EC3 , wherein the positive electrode of the third energy storage filter capacitor EC3 is coupled to the power supply terminal VDD, and the negative electrode of the third energy storage filter capacitor EC3 is coupled to the fourth terminal 4 .

[0135] Specifically, in some embodiments, the power supply circuit includes a fourth diode D10, an eighth resistor R8 and a third energy storage filter capacitor EC3.

[0136] The anode of the fourth diode D10 is coupled to the third terminal 3 of the auxiliary coil of the transformer T through the eighth resistor R8, and the cathode is connected to the power supply terminal VDD of the power chip. When the auxiliary coil generates an induced voltage, the fourth diode D10 is turned on, and the induced voltage is transmitted to the power supply terminal VDD of the power chip through its cathode, providing the required power for the power chip.

[0137] One end of the eighth resistor R8 is connected to the anode of the fourth diode D10, and the other end is coupled to the third end 3 of the auxiliary coil of the transformer T. The eighth resistor R8 acts as a current limiting resistor to limit the current of the fourth diode D10 to prevent excessive current from damaging the power chip.

[0138] The positive electrode of the third energy storage filter capacitor EC3 is connected to the power supply terminal VDD of the power chip, and the negative electrode is coupled to the fourth terminal 4 of the auxiliary coil of the transformer T. The third energy storage filter capacitor EC3 is used as an energy storage element to store and release energy, smooth the voltage of the power supply terminal VDD of the power chip, reduce voltage fluctuations, and improve the stability of the power supply.

[0139] Optionally, the at least one secondary coil includes a first secondary coil; the first secondary coil includes a ninth end 9 and a tenth end 10;

[0140] The output circuit comprises a first output circuit; an input end of the first output circuit is coupled to the first secondary coil;

[0141] The feedback circuit comprises:

[0142] An optical coupling transmission component, the optical coupling transmission component comprises a receiver O11 and a transmitter O12; one end of the receiver O11 is coupled to the feedback end COMP, and the other end of the receiver O11 is coupled to the fourth end 4 and / or ground;

[0143] One end of the transmitter O12 is coupled to the ninth end 9 through a ninth resistor R9;

[0144] A three-terminal parallel adjustable voltage regulator U1, wherein a negative electrode of the three-terminal parallel adjustable voltage regulator U1 is grounded, and a positive electrode of the three-terminal parallel adjustable voltage regulator U1 is coupled to the other end of the transmitter O12;

[0145] A feedback voltage circuit, wherein an input terminal of the feedback voltage circuit is coupled to an output terminal of the first output circuit, a ground terminal GND of the feedback voltage circuit is grounded, and an output terminal of the feedback voltage circuit between the input terminal and the ground terminal GND is coupled to a reference terminal of the three-terminal parallel adjustable regulator U1 to output a feedback voltage;

[0146] a tenth resistor R10, wherein one end of the tenth resistor R10 and the ninth resistor R9 are coupled to the ninth resistor R9, and the other end of the ninth resistor R9 is coupled to the other end of the transmitter O12;

[0147] A third capacitor C3, one end of the third capacitor C3 is coupled to the positive electrode of the three-terminal parallel adjustable regulator U1, and the other end of the third capacitor C3 is coupled to the output end of the feedback voltage circuit between the input end and the ground end GND through an eleventh resistor R11.

[0148] Specifically, the first secondary coil includes a ninth terminal 9 and a tenth terminal 10. The ninth terminal 9 is coupled to the first output circuit in the output circuit as the output terminal of the first secondary coil to provide the required power supply for the external load F0. The tenth terminal 10 is coupled to the transmitter O12 in the feedback circuit as the reference terminal of the first secondary coil to provide the required voltage reference for the feedback circuit.

[0149] The input end of the first output circuit is connected to the ninth end 9 of the first secondary coil, and is used to receive the voltage output by the first secondary coil to provide the required power for the external load F0.

[0150] The feedback circuit includes an optocoupler transmission component, a three-terminal parallel adjustable regulator U1, a feedback voltage circuit, a ninth resistor R9, a tenth resistor R10 and a third capacitor C3.

[0151] The optical coupling transmission component includes a receiver O11 and a transmitter O12. One end of the receiver O11 is coupled to the feedback terminal COMP of the power chip, and the other end is coupled to the tenth end 10 of the first secondary coil through the ninth resistor R9, and can also be grounded. One end of the transmitter O12 is coupled to the ninth end 9 of the first secondary coil through the ninth resistor R9, and the other end is coupled to the positive electrode of the three-terminal parallel adjustable regulator U1.

[0152] The transmitter O12 in the optical coupling transmission component generates a light signal according to the voltage output by the first output circuit, and the receiver O11 generates a feedback signal after receiving the light signal to feed back to the power chip; the power chip adjusts the on and off of the primary coil according to the feedback signal.

[0153] The negative electrode of the three-terminal parallel adjustable voltage regulator U1 is grounded, and the positive electrode is coupled to the other end of the transmitter O12. The three-terminal parallel adjustable voltage regulator U1 is used as a voltage stabilizing element to stabilize the voltage output by the transmitter O12.

[0154] The input end of the feedback voltage circuit is coupled to the output end of the first output circuit, and the ground end GND is grounded. The output end of the feedback voltage circuit between the input end and the ground end GND is coupled to the reference end of the three-terminal parallel adjustable regulator U1, and is used to output feedback voltage to adjust the output voltage of the power chip.

[0155] One end of the ninth resistor R9 is coupled to one end of the transmitter O12, and the other end is coupled to the tenth end 10. The ninth resistor R9 serves as a current limiting resistor to limit the current of the transmitter O12 to prevent excessive current from damaging the power chip.

[0156] One end of the tenth resistor R10 is coupled to one end of the ninth resistor R9, and the other end is coupled to the other end of the transmitter O12. The tenth resistor R10 is used as a voltage dividing resistor to adjust the voltage of the transmitter O12.

[0157] One end of the third capacitor C3 is coupled to the positive electrode of the three-terminal parallel adjustable regulator U1, and the other end is coupled to the output end of the feedback voltage circuit between the input end and the ground end GND through the eleventh resistor R11. The third capacitor C3 is used as an energy storage element to store and release energy.

[0158] Optionally, the feedback voltage circuit includes:

[0159] a twelfth resistor R12, one end of the twelfth resistor R12 is coupled to the external load F0, and the other end of the twelfth resistor R12 is grounded via a thirteenth resistor R13 and a fourteenth resistor R14 in sequence;

[0160] A connection point between the thirteenth resistor R13 and the fourteenth resistor R14 leads to an output end of the feedback voltage circuit.

[0161] Specifically, in some embodiments, one end of the twelfth resistor R12 is coupled to the external load F0, and the other end is grounded through the thirteenth resistor R13 and the fourteenth resistor R14 in sequence. The twelfth resistor R12 is used as a sampling resistor to sample the load current and provide the required current reference for the feedback voltage circuit. The thirteenth resistor R13 is used as a voltage divider resistor to adjust the voltage of the sampled current of the twelfth resistor R12. The fourteenth resistor R14 is used as a current limiting resistor to limit the current of the twelfth resistor R12 to prevent excessive current from damaging the power chip.

[0162] The output end of the feedback voltage circuit is located at the connection point between the thirteenth resistor R13 and the fourteenth resistor R14, that is, the voltage reference point of the sampling current. The output end is coupled to the reference end of the three-terminal parallel adjustable regulator U1 to output the feedback voltage and adjust the output voltage of the power chip.

[0163] Optionally, the first output circuit includes:

[0164] A fifth diode D11, an anode of the fifth diode D11 is coupled to the ninth terminal 9, and a cathode of the fifth diode D11 is coupled to the external load F0 via the first inductor L1; the ninth terminal 9 and the third terminal 3 are terminals of the same name.

[0165] a fifteenth resistor R15, one end of the fifteenth resistor R15 is coupled to the anode of the fifth diode D11, and the other end of the fifteenth resistor R15 is coupled to the cathode of the fifth diode D11 via a fourth capacitor C4;

[0166] A fourth energy storage filter capacitor EC4, a fifth energy storage filter capacitor EC5, a fifth capacitor C5 and a sixteenth resistor R16 are sequentially connected in parallel between the external load F0 and the ground terminal GND;

[0167] One end of the first inductor L1 is coupled to the fourth energy storage filter capacitor EC4 , and the other end of the first inductor L1 is coupled to the fifth energy storage filter capacitor EC5 .

[0168] Specifically, the anode of the fifth diode D11 is coupled to the ninth terminal 9 of the first secondary coil, and the cathode is coupled to the external load F0 through the first inductor L1. The fifth diode D11 serves as a rectifying element to convert the AC voltage output by the first secondary coil into a DC voltage to provide the required power for the external load F0.

[0169] One end of the fifteenth resistor R15 is coupled to the anode of the fifth diode D11, and the other end is coupled to the cathode of the fifth diode D11 through the fourth capacitor C4. The fifteenth resistor R15 is used as a voltage dividing resistor to adjust the output voltage of the fifth diode D11.

[0170] The fourth energy storage filter capacitor EC4, the fifth energy storage filter capacitor EC5, the fifth capacitor C5 and the sixteenth resistor R16 are connected in parallel between the external load F0 and the ground terminal GND. The fourth energy storage filter capacitor EC4 and the fifth energy storage filter capacitor EC5 are used as energy storage elements to store and release energy. The fifth capacitor C5 is used as a decoupling capacitor to reduce the impact of internal noise of the power supply system on the load and improve the anti-interference performance of the power supply system. The sixteenth resistor R16 is used as a current limiting resistor to limit the current of the fifth diode D11 to prevent excessive current from damaging the power chip. One end of the first inductor L1 is coupled to the fourth energy storage filter capacitor EC4, and the other end is coupled to the fifth energy storage filter capacitor EC5.

[0171] Optionally, the at least one secondary coil includes a second secondary coil; the second secondary coil includes an eleventh end 11 and a twelfth end 12;

[0172] The at least one output circuit includes a second output circuit, an input end of the second output circuit is coupled to the second secondary coil; the second output circuit includes:

[0173] a sixth diode D12, wherein an anode of the sixth diode D12 is coupled to the eleventh terminal 11;

[0174] A switch chip U2, wherein an input end of the switch chip U2 is coupled to the cathode of the sixth diode D12, an output end of the switch chip U2 is coupled to the external load F0, and a ground end GND of the switch chip U2 is grounded;

[0175] A sixth energy storage filter capacitor EC6, wherein a positive electrode of the sixth energy storage filter capacitor EC6 is coupled to the input end of the switch chip U2, and a negative electrode of the sixth energy storage filter capacitor EC6 is grounded;

[0176] a seventeenth resistor R17, one end of the seventeenth resistor R17 is coupled to the anode of the sixth diode D12, and the other end of the seventeenth resistor R17 is coupled to the cathode of the sixth diode D12 via a sixth capacitor C6;

[0177] A seventh energy storage filter capacitor EC7, a seventh inductor C7 and an eighteenth resistor R18 are sequentially connected in parallel between the external load F0 and the ground terminal GND;

[0178] The positive electrode of the seventh energy storage filter capacitor EC7 is coupled to the output end of the switch chip U2.

[0179] Specifically, in some embodiments, the second secondary coil includes an eleventh terminal 11 and a twelfth terminal 12. The second terminal 2 and the eleventh terminal 11 are terminals of the same name.

[0180] The eleventh terminal 11 is used as the output terminal of the second secondary coil, coupled with the sixth diode D12 in the second output circuit, and provides the required power supply for the external load F0. The twelfth terminal 12 is used as the reference terminal of the second secondary coil, coupled with the transmitter O12 in the feedback circuit, and provides the required voltage reference for the feedback circuit. The input terminal of the second output circuit is connected to the eleventh terminal 11 of the second secondary coil, and is used to receive the voltage output by the second secondary coil, and provide the required power supply for the external load F0. The second output circuit includes the sixth diode D12, the switch chip U2, the sixth energy storage filter capacitor EC6, the seventeenth resistor R17, the seventh energy storage filter capacitor EC7, the seventh inductor C7 and the eighteenth resistor R18.

[0181] The anode of the sixth diode D12 is coupled to the eleventh terminal 11 of the second secondary coil, and the cathode is coupled to the input terminal of the switch chip U2. The sixth diode D12 serves as a rectifying element to convert the AC voltage output by the second secondary coil into a DC voltage to provide the required power for the switch chip U2.

[0182] The input end of the switch chip U2 is coupled to the cathode of the sixth diode D12, the output end is coupled to the external load F0, and the ground terminal GND is grounded. The anode of the sixth energy storage filter capacitor EC6 is coupled to the input end of the switch chip U2, and the cathode is grounded. The sixth energy storage filter capacitor EC6 is used as an energy storage element for storing and releasing energy. One end of the seventeenth resistor R17 is coupled to the anode of the sixth diode D12, and the other end is coupled to the cathode of the sixth diode D12 through the sixth capacitor C6. The seventeenth resistor R17 is used as a voltage divider resistor to adjust the voltage of the output voltage of the sixth diode D12. The seventh energy storage filter capacitor EC7, the seventh inductor C7 and the eighteenth resistor R18 are connected in parallel between the external load F0 and the ground terminal GND. The seventh energy storage filter capacitor EC7 and the seventh inductor C7 are used as energy storage elements for storing and releasing energy. The eighteenth resistor R18 is used as a current limiting resistor to limit the current of the sixth diode D12 to prevent excessive current from damaging the power chip.

[0183] Optionally, there is an eighth capacitor C8 between the receiver O11 and the feedback terminal COMP, one end of the eighth capacitor C8 is coupled to the feedback terminal COMP, and the other end is grounded; and there is a ninth capacitor C9 between the first terminal 1 and the tenth terminal 10, one end of the ninth capacitor C9 is connected to the ninth terminal 9 and the other end is connected to the tenth terminal 10.

[0184] Optionally, the overcurrent detection circuit includes a nineteenth resistor R19 and a twentieth resistor R20, the nineteenth resistor R19 and the twentieth resistor R20 are connected in parallel, one end of the nineteenth resistor R19 is coupled to the overcurrent detection terminal CS, and one end is grounded. The overcurrent detection circuit is used to detect whether the current in the power supply circuit exceeds a preset threshold value. When the current exceeds the preset threshold value, the overcurrent detection circuit outputs a signal to trigger the power supply chip to take corresponding protection measures to prevent the power supply chip from being damaged by excessive current.

[0185] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. An AC input power supply circuit, characterized in that: include: At least one live wire input terminal, one end of which is connected to an external power supply; A zero line input terminal, one end of which is grounded; At least one lightning surge protection circuit, wherein an input terminal of one of the at least one lightning surge protection circuits is coupled to the other end of one of the at least one live line input terminal and / or the other end of the neutral line input terminal; One of the at least one lightning surge protection circuits comprises: A first fuse, one end of the first fuse being coupled to the other end of the live wire input end; a second fuse, one end of the second fuse being coupled to the other end of the neutral line input end; an adjustable resistor, one end of the adjustable resistor being coupled to one end of the live wire input end, and the other end of the adjustable resistor being coupled to the other end of the second fuse; A transformer, the transformer comprising a primary coil, an auxiliary coil and at least one secondary coil; the primary coil comprises a first end and a second end; the auxiliary coil comprises a third end and a fourth end; The output end of the lightning surge protection circuit is coupled to the first end; A power chip, the power chip comprising a power access terminal, a power supply terminal, a feedback terminal, an overcurrent detection terminal and a ground terminal; The power supply access terminal is coupled to the second terminal; the power supply terminal is coupled to the third terminal through a power supply circuit; the feedback terminal is coupled to a feedback circuit; the ground terminal is grounded; and the overcurrent detection terminal is coupled to an overcurrent detection circuit; At least one output circuit, one of the at least one output circuit is coupled to one of the at least one secondary coil; and an output end of the output circuit is connected to an external load.

2. The AC input power supply circuit according to claim 1, characterized in that: An interference suppression circuit is also provided between the lightning surge protection circuit and the transformer, and the interference suppression circuit includes: A first capacitor, one end of the first capacitor is coupled to the at least one live line input end through a three-phase rectifier bridge; the other end of the first capacitor is coupled to the neutral line input end through the three-phase rectifier bridge; a first resistor, one end of the first resistor being coupled to one end of the first capacitor, and the other end of the first resistor being coupled to the other end of the first capacitor via a second resistor; A common mode suppression inductor, the common mode suppression inductor comprises a first winding and a second winding, the first winding comprises a fifth end and a sixth end; the second winding comprises a seventh end and an eighth end; the fifth end and the seventh end are the same end; The fifth end is coupled to the at least one live line input end through a three-phase rectifier bridge, and the seventh end is coupled to the neutral line input end through the three-phase rectifier bridge; The sixth end is coupled to the first end; and the eighth end is grounded.

3. The AC input power supply circuit according to claim 2, characterized in that: The three-phase rectifier bridge comprises: a pair of diodes adjacent to each of the live input terminals and the neutral input terminals, comprising: a first diode, wherein an anode of the first diode is coupled to at least one of the live wire input terminals, and a cathode of the first diode is coupled to the fifth terminal; A second diode, wherein an anode of the second diode is coupled to the seventh terminal, and a cathode of the second diode is coupled to at least one of the live line input terminal and / or the neutral line input terminal.

4. The AC input power supply circuit according to claim 2, characterized in that: An RCD absorption circuit is also provided between the output end of the interference suppression circuit and the transformer, and the RCD absorption circuit comprises: A first voltage stabilizing diode, wherein an anode of the first voltage stabilizing diode is coupled to the sixth end; a third diode, wherein an anode of the third diode is coupled to the power supply access terminal, and a cathode of the third diode is coupled to a cathode of the first voltage regulator diode; a third resistor, one end of the third resistor is coupled to the first end, the other end of the third resistor is coupled to the cathode of the third diode, and the second resistor is connected in parallel with the first voltage regulator diode; A second capacitor is connected in parallel with the third resistor.

5. The AC input power supply circuit according to claim 2, characterized in that: An input energy storage filter circuit is also provided between the output end of the interference suppression circuit and the transformer, and the input energy storage filter circuit comprises: A first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to the sixth end; a second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to a negative electrode of the first energy storage filter capacitor, and a negative electrode of the second energy storage filter capacitor is coupled to the eighth terminal; a fourth resistor, one end of the fourth resistor being coupled to the positive electrode of the first energy storage filter capacitor, and the other end of the fourth resistor being coupled to the negative electrode of the first energy storage filter capacitor through a fifth resistor; A sixth resistor, one end of the sixth resistor is coupled to the positive electrode of the second energy storage filter capacitor, and the other end of the sixth resistor is coupled to the negative electrode of the second energy storage filter capacitor through a seventh resistor.

6. The AC input power supply circuit according to claim 1, characterized in that: The power supply circuit comprises: a fourth diode, wherein an anode of the fourth diode is coupled to the third end through an eighth resistor, and a cathode of the fourth diode is coupled to the power supply end; A third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to the power supply end, and a negative electrode of the third energy storage filter capacitor is coupled to the fourth end.

7. The AC input power supply circuit according to claim 1, characterized in that: The at least one secondary coil comprises a first secondary coil; the first secondary coil comprises a ninth end and a tenth end; The output circuit comprises a first output circuit; an input end of the first output circuit is coupled to the first secondary coil; The feedback circuit comprises: An optical coupling transmission component, the optical coupling transmission component comprising a receiver and a transmitter; one end of the receiver is coupled to the feedback end, and the other end of the receiver is coupled to the fourth end and / or ground; One end of the transmitter is coupled to the ninth end through a ninth resistor; A three-terminal parallel adjustable voltage regulator, wherein the negative electrode of the three-terminal parallel adjustable voltage regulator is grounded, and the positive electrode of the three-terminal parallel adjustable voltage regulator is coupled to the other end of the transmitter; a feedback voltage circuit, wherein an input terminal of the feedback voltage circuit is coupled to an output terminal of the first output circuit, a ground terminal of the feedback voltage circuit is grounded, and an output terminal of the feedback voltage circuit between the input terminal and the ground terminal is coupled to a reference terminal of the three-terminal parallel adjustable regulator to output a feedback voltage; a tenth resistor, wherein one end of the tenth resistor is coupled to the ninth resistor, and the other end of the ninth resistor is coupled to the other end of the transmitter; A third capacitor, one end of the third capacitor is coupled to the positive electrode of the three-terminal parallel adjustable regulator, and the other end of the third capacitor is coupled to the output end of the feedback voltage circuit between the input end and the ground end through an eleventh resistor.

8. The AC input power supply circuit according to claim 7, characterized in that: The feedback voltage circuit comprises: a twelfth resistor, one end of the twelfth resistor being coupled to the external load, and the other end of the twelfth resistor being grounded via a thirteenth resistor and a fourteenth resistor in sequence; A connection point between the thirteenth resistor and the fourteenth resistor leads to an output end of the feedback voltage circuit.

9. The AC input power supply circuit according to claim 7, characterized in that: The first output circuit comprises: a fifth diode, wherein an anode of the fifth diode is coupled to the ninth terminal, and a cathode of the fifth diode is coupled to the external load via a first inductor; a fifteenth resistor, one end of the fifteenth resistor being coupled to the anode of the fifth diode, and the other end of the fifteenth resistor being coupled to the cathode of the fifth diode via a fourth capacitor; A fourth energy storage filter capacitor, a fifth energy storage filter capacitor, a fifth capacitor and a sixteenth resistor are sequentially connected in parallel between the external load and the ground terminal; One end of the first inductor is coupled to the fourth energy storage filter capacitor, and the other end of the first inductor is coupled to the fifth energy storage filter capacitor.

10. The AC input power supply circuit according to claim 1, characterized in that: The at least one secondary coil includes a second secondary coil; the second secondary coil includes an eleventh end and a twelfth end; The at least one output circuit comprises a second output circuit, an input terminal of the second output circuit is coupled to the second secondary coil; The second output circuit comprises: a sixth diode, wherein an anode of the sixth diode is coupled to the eleventh terminal; a switch chip, wherein an input end of the switch chip is coupled to the cathode of the sixth diode, an output end of the switch chip is coupled to the external load, and a ground end of the switch chip is grounded; a sixth energy storage filter capacitor, wherein a positive electrode of the sixth energy storage filter capacitor is coupled to the input end of the switch chip, and a negative electrode of the sixth energy storage filter capacitor is grounded; a seventeenth resistor, one end of the seventeenth resistor being coupled to the anode of the sixth diode, and the other end of the seventeenth resistor being coupled to the cathode of the sixth diode via a sixth capacitor; A seventh energy storage filter capacitor, a seventh inductor and an eighteenth resistor are sequentially connected in parallel between the external load and the ground terminal; The positive electrode of the seventh energy storage filter capacitor is coupled to the output end of the switch chip.

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