Voltage-stabilizing output power supply circuit

Abstract

The embodiment of the utility model provides a voltage-stabilized output power supply circuit. The voltage-stabilized output power supply circuit comprises an interference suppression circuit coupled with an input circuit; the output end of the interference suppression circuit is coupled with the first end of the primary 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; the output end of the output circuit is coupled with an external load and a circuit grounding end; the input end of the output circuit is coupled with the secondary coil; the voltage-stabilizing feedback circuit comprises: a receiver, one end of which is coupled to a feedback end; the positive electrode of the first voltage stabilizing diode is coupled to the other end of the emitter, and the negative electrode of the first voltage stabilizing diode is coupled to the secondary output end between the input end and the output end of the input circuit. Through the voltage stabilization feedback circuit, the circuit structure is simplified, and the production cost is reduced. Meanwhile, the voltage-stabilizing feedback circuit disclosed by the utility model realizes voltage feedback by utilizing the optical coupling component and the first voltage-stabilizing diode, ensures that feedback signals are accurate, and can quickly respond when the output voltage of the power supply changes.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply circuits, and in particular to a voltage-stabilized output power supply circuit. Background Art

[0002] In the field of modern power supply technology, the voltage-stabilized output power supply circuit is a crucial component, which is responsible for converting the external power supply into a stable and reliable DC voltage for the load. In the traditional voltage-stabilized output power supply circuit, the feedback loop is usually designed with an optocoupler (such as T431 with a voltage divider resistor) to achieve voltage feedback and stable output. The optocoupler can achieve electrical isolation between the input and output, and accurately set the feedback voltage through the voltage divider resistor network to ensure the stability of the output voltage of the power supply. However, such a design also has its shortcomings, such as the relatively high cost of the optocoupler, which is easily affected by factors such as temperature and aging, and the voltage divider resistor network will bring additional power consumption and circuit board area. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a voltage-stabilized output power supply circuit to solve the problems in the related art.

[0004] A first aspect of the present disclosure provides a voltage-stabilized output power supply circuit, comprising:

[0005] An input circuit, wherein an input end of the input circuit is connected to an external power supply;

[0006] an interference suppression circuit, wherein an input terminal of the interference suppression circuit is coupled to an output terminal of the input circuit;

[0007] A transformer, the transformer comprising a primary coil, an auxiliary coil and at least one secondary coil;

[0008] The primary coil includes a first end and a second end; the auxiliary coil includes a third end and a fourth end;

[0009] The output end of the interference suppression circuit is coupled to the first end through a rectifier bridge;

[0010] A power chip, the power chip comprising a power input terminal, a power supply terminal, a feedback terminal, an overcurrent detection terminal and a ground terminal;

[0011] 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 overcurrent detection terminal is grounded through an overcurrent detection circuit; and the ground terminal is grounded;

[0012] At least one output circuit, the output end of each output circuit is coupled to an external load and a circuit ground end; the input end of each output circuit is coupled to one of the secondary coils;

[0013] A voltage stabilization feedback circuit, the voltage stabilization feedback circuit comprising:

[0014] An optical coupler assembly, the optical coupler assembly comprising a transmitter and a receiver;

[0015] One end of the receiver is coupled to the feedback end, and the other end of the receiver is grounded; one end of the transmitter is grounded;

[0016] A first Zener diode, wherein the anode of the first Zener diode is coupled to the other end of the transmitter, and the cathode of the first Zener diode is coupled to a secondary output terminal between an input terminal and an output terminal of an input circuit of the at least one output circuit through a first resistor.

[0017] In an embodiment of the first aspect, the input circuit comprises:

[0018] A live wire input terminal, an input terminal of the live wire input terminal being connected to an external power source, and an output terminal of the live wire input terminal being coupled to an input terminal of the interference suppression circuit via a first fuse;

[0019] A neutral line input terminal, an input terminal of the neutral line input terminal is grounded, and an output terminal of the neutral line input terminal is coupled to an input terminal of the interference suppression circuit through a second fuse.

[0020] In an embodiment of the first aspect, the interference suppression circuit includes:

[0021] An adjustable resistor, one end of which is coupled to the output end of the live line input end, and the other end of which is coupled to the output end of the neutral line input end;

[0022] A first capacitor, the first capacitor is connected in parallel with the adjustable resistor;

[0023] a second resistor, one end of the second resistor being coupled to one end of the first capacitor, and the other end of the second resistor being coupled to the other end of the first capacitor through a third resistor;

[0024] 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;

[0025] The fifth end is coupled to the output end of the live line input end, and the seventh end is coupled to the output end of the neutral line input end.

[0026] In an embodiment of the first aspect, the power supply circuit includes:

[0027] a first diode, wherein an anode of the first diode is coupled to the third end via a fourth resistor, and a cathode of the first diode is coupled to the power supply end;

[0028] a first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to a negative electrode of the first diode, and a negative electrode of the first energy storage filter capacitor is coupled to the fourth end;

[0029] A second capacitor is connected in parallel with the first energy storage filter capacitor.

[0030] In an embodiment of the first aspect, a device is further provided between the output end of the interference suppression circuit and the primary coil:

[0031] A second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to the first end, and a negative electrode of the second energy storage filter capacitor is grounded;

[0032] RCD absorption circuit, the RCD absorption circuit comprising:

[0033] a third capacitor, one end of the third capacitor being coupled to the first end;

[0034] a second diode, wherein a cathode of the second diode is coupled to the other end of the third capacitor via a fourth resistor, and an anode of the second diode is coupled to the power input terminal;

[0035] A fifth resistor, one end of the fifth resistor is coupled to the first end, and the other end of the fifth resistor is coupled to the fourth resistor.

[0036] In an embodiment of the first aspect, the overcurrent detection circuit includes:

[0037] a sixth resistor, one end of the sixth resistor being coupled to the overcurrent detection end, and the other end of the sixth resistor being grounded;

[0038] A seventh resistor is connected in parallel with the sixth resistor.

[0039] In an embodiment of the first aspect, a fourth capacitor is further disposed between the feedback terminal and the ground terminal, one end of the fourth capacitor is coupled to the feedback terminal, and the other end of the fourth capacitor is grounded.

[0040] 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; the at least one output circuit includes a first output circuit, and the first output circuit includes:

[0041] a third diode, wherein an anode of the third diode is coupled to the ninth terminal, and a cathode of the third diode is coupled to an external load via a first inductor;

[0042] a third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to one end of the first inductor, and a negative electrode of the third energy storage filter capacitor is grounded;

[0043] A fourth energy storage filter capacitor, a fifth capacitor and an eighth resistor are sequentially connected in parallel between the external load and the power ground terminal;

[0044] The positive electrode of the fourth energy storage filter capacitor is coupled to the other end of the first inductor, and the negative electrode of the fourth energy storage filter capacitor is grounded;

[0045] The connection point between the cathode of the third diode and the first inductor leads to the secondary output terminal;

[0046] a ninth resistor, one end of the ninth resistor being coupled to the anode of the third diode, and the other end of the ninth resistor being coupled to the cathode of the third diode via a sixth capacitor;

[0047] A tenth resistor is connected in parallel with the ninth resistor.

[0048] 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; the at least one output circuit includes a second output circuit, and the second output circuit includes:

[0049] a fourth diode, wherein an anode of the fourth diode is coupled to the eleventh terminal, and a cathode of the fourth diode is coupled to the external load via a second inductor;

[0050] a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to one end of the second inductor, and a negative electrode of the fifth energy storage filter capacitor is grounded through the power supply ground terminal;

[0051] A sixth energy storage filter capacitor, a seventh capacitor and an eleventh resistor are sequentially connected in parallel between the external load and the power ground terminal;

[0052] The positive electrode of the sixth energy storage filter capacitor is coupled to the other end of the second inductor, and the negative electrode of the sixth energy storage filter capacitor is grounded through the power ground terminal;

[0053] a twelfth resistor, one end of the twelfth resistor is coupled to the fourth diode, and the other end of the twelfth resistor is coupled to the cathode of the fourth diode via an eighth capacitor;

[0054] A thirteenth resistor is connected in parallel with the twelfth resistor.

[0055] In an embodiment of the first aspect, the voltage-regulated output power supply circuit further includes an eighth capacitor, one end of the eighth capacitor is coupled to the first end, and the other end of the eighth capacitor is grounded.

[0056] Beneficial effects of the present disclosure: The present disclosure replaces the combination of the traditional optocoupler (such as T431) and the voltage-dividing resistor through the voltage-stabilizing feedback circuit, simplifies the circuit structure, reduces the number of required components, and thus significantly reduces the production cost. At the same time, the voltage-stabilizing feedback circuit of the present disclosure uses the optocoupler component and the first voltage-stabilizing diode to realize voltage feedback, ensuring the accuracy of the feedback signal and being able to respond quickly when the power supply output voltage changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A circuit schematic diagram showing a voltage-stabilized output power supply circuit in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] In related technologies, the feedback loop of the power supply circuit is usually designed using an optocoupler (such as T431 with a voltage divider resistor) to achieve voltage feedback. However, the cost of the optocoupler is relatively high, and it is easily affected by factors such as temperature and aging. In addition, the voltage divider resistor network will bring additional power consumption and occupy circuit board area.

[0068] In view of this, a voltage-stabilized output power supply circuit is provided in an embodiment of the present disclosure, including: an input circuit, an interference suppression circuit, a transformer T1, a power supply chip, at least one output circuit and a voltage-stabilized feedback circuit.

[0069] An input terminal of the interference suppression circuit is coupled to an output terminal of the input circuit.

[0070] The transformer T1 includes a primary coil, an auxiliary coil and at least one secondary coil.

[0071] The primary coil includes a first end 1 and a second end 2 ; the auxiliary coil includes a third end 3 and a fourth end 4 .

[0072] The output end of the interference suppression circuit is coupled to the first end 1 through a rectifier bridge.

[0073] The power chip includes a power input terminal SW, a power supply terminal VDD, a feedback terminal FB, an overcurrent detection terminal CS and a ground terminal GND.

[0074] The power input 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 overcurrent detection terminal CS is grounded through an overcurrent detection circuit; and the ground terminal GND is grounded.

[0075] The output end of each of the output circuits is coupled to an external load F0 and a circuit ground GND; the input end of each of the output circuits is coupled to one of the secondary coils.

[0076] The input end of the input circuit is connected to an external power supply.

[0077] The voltage stabilizing feedback circuit includes: an optocoupler component and a first voltage stabilizing diode Z1.

[0078] The optical coupling component includes a transmitter O12 and a receiver O11.

[0079] One end of the receiver O11 is coupled to the feedback terminal FB, and the other end of the receiver O11 is grounded. One end of the transmitter O12 is grounded.

[0080] An anode of the first Zener diode Z1 is coupled to the other end of the transmitter O12 , and a cathode of the first Zener diode Z1 is coupled to a secondary output terminal between an input terminal and an output terminal of one of the at least one output circuits through a first resistor R1 .

[0081] The voltage-stabilized output power supply circuit provided in the embodiment of the present disclosure replaces the combination of the optical coupler (such as T431) and the voltage-dividing resistor in the feedback loop of the power supply circuit in the related art through the voltage-stabilized feedback circuit, simplifies the circuit structure, reduces the number of required components, and thus significantly reduces the production cost. At the same time, the voltage-stabilized feedback circuit of the present disclosure uses the optical coupler component and the first voltage-stabilizing diode Z1 to realize voltage feedback, ensures the accuracy of the feedback signal, and can respond quickly when the power supply output voltage changes.

[0082] exist Figure 1 In the embodiment, the voltage-stabilized output power supply circuit includes: an input circuit, an interference suppression circuit, a transformer T1, a power chip, at least one output circuit and a voltage-stabilized feedback circuit.

[0083] Optionally, the input end of the input circuit is connected to an external power supply, and the output end of the input circuit suppresses interference signals through an interference suppression circuit to ensure the quality of the power entering the transformer T1.

[0084] Optionally, the transformer T1 includes a primary coil, an auxiliary coil and at least one secondary coil, the first end 1 and the second end 2 of the primary coil are connected to the interference suppression circuit and the power chip respectively, and the third end 3 and the fourth end 4 of the auxiliary coil are connected to the power supply terminal VDD of the power chip and the related grounding circuit. The rectifier bridge is connected between the output end of the interference suppression circuit and the first end 1 of the primary coil, and is used to convert the AC signal into a DC signal.

[0085] Optionally, the power chip includes a power input terminal SW, a power supply terminal VDD, a feedback terminal FB, an overcurrent detection terminal CS and a ground terminal GND. The power input terminal SW is coupled to the second terminal 2 of the primary coil, the power supply terminal VDD is connected to the third terminal 3 of the auxiliary coil through the power supply circuit, and the overcurrent detection terminal CS is grounded through the overcurrent detection circuit to achieve overload protection of the power supply. At least one output circuit corresponds to a secondary coil, and the output terminal of each output circuit is connected to the external load F0 and the circuit ground terminal GND, and the input terminal is coupled to the secondary coil to provide a stable power output for the load. The voltage stabilization feedback mechanism formed by the optocoupler component and the first voltage stabilizing diode Z1 is used to achieve a regulated output.

[0086] Optionally, in some embodiments, the power chip model is PN6626H and its related series chips with similar functions, or power chips from other manufacturers with similar principles.

[0087] The voltage stabilizing feedback circuit is composed of an optocoupler component and a first voltage stabilizing diode Z1. The optocoupler component includes a transmitter O12 and a receiver O11. One end of the receiver O11 is connected to the feedback end FB of the power chip, and the other end is grounded; one end of the transmitter O12 is also grounded. The anode of the first voltage stabilizing diode Z1 is connected to the other end of the transmitter O12, and the cathode is coupled to the secondary output end between the input end and the output end of one input circuit in at least one output circuit through the first resistor R1.

[0088] Optionally, a fourteenth resistor R14 is also provided in the voltage stabilizing feedback circuit. The fourteenth resistor R14 is connected in parallel with the transmitter O12, and can play a shunt role to adjust the operating current of the transmitter O12, ensuring that the photoelectric conversion efficiency of the transmitter O12 is in an optimal state, thereby improving the stability and accuracy of the feedback signal.

[0089] Optional, in Figure 1 In the embodiment, the input circuit includes: a live line input terminal L and a neutral line input terminal N.

[0090] The input end of the live wire input terminal L is connected to an external power source, and the output end of the live wire input terminal L is coupled to the input end of the interference suppression circuit through a first fuse F1.

[0091] An input end of the neutral line input terminal N is grounded, and an output end of the neutral line input terminal N is coupled to an input end of the interference suppression circuit through a second fuse F2.

[0092] Specifically, in some embodiments, the input circuit includes a live line input terminal L and a neutral line input terminal N to achieve effective access to and protection of the AC power supply.

[0093] The live wire input terminal L is connected to an external power supply to provide a live wire input of an AC voltage. The output end of the live wire input terminal L is coupled to the input end of the interference suppression circuit through a first fuse F1. The first fuse F1 serves as a safety protection function. Once an overload or short circuit occurs in the circuit, the fuse will blow in time to cut off the power supply to prevent damage to the entire power supply circuit.

[0094] The input end of the neutral line input terminal N is grounded to ensure the safe connection of the neutral line and meet the electrical safety specification requirements of the circuit. The output end of the neutral line input terminal N is coupled to the input end of the interference suppression circuit through a second fuse, and a fuse is also provided as a protection element, which doubles the safety of the power supply circuit.

[0095] Optional, in Figure 1 In the embodiment, the interference suppression circuit includes: an adjustable resistor RV1, a first capacitor C1, a second resistor R2 and a common mode suppression inductor T2.

[0096] One end of the adjustable resistor RV1 is coupled to the output end of the live line input end L, and the other end of the adjustable resistor RV1 is coupled to the output end of the neutral line input end N.

[0097] The first capacitor C1 is connected in parallel with the adjustable resistor RV1.

[0098] One end of the second resistor R2 is coupled to one end of the first capacitor C1 , and the other end of the second resistor R2 is coupled to the other end of the first capacitor C1 through a third resistor R3 .

[0099] The common mode suppression inductor T2 includes a first winding and a second winding. The first winding includes a fifth terminal 5 and a sixth terminal 6. The second winding includes a seventh terminal 7 and an eighth terminal 8. The fifth terminal 5 and the seventh terminal 7 are terminals of the same name.

[0100] The fifth terminal 5 is coupled to the output terminal of the live line input terminal L, and the seventh terminal 7 is coupled to the output terminal of the neutral line input terminal N.

[0101] Specifically, in some embodiments, the interference suppression circuit includes an adjustable resistor RV1, a first capacitor C1, a second resistor R2, and a common-mode suppression inductor T2 to more effectively suppress interference signals at the power input terminal SW and ensure the stability of the power output.

[0102] The adjustable resistor RV1 is configured between the live input terminal L and the neutral input terminal N of the input circuit, one end of which is coupled to the output end of the live input terminal L, and the other end is coupled to the output end of the neutral input terminal N. By adjusting the resistance value of the adjustable resistor RV1, it is possible to flexibly cope with different power input environments and preliminarily suppress and calibrate the fluctuation of the input voltage.

[0103] The first capacitor C1 is connected in parallel with the adjustable resistor RV1, and its two ends are coupled with the two ends of the adjustable resistor RV1 respectively. The first capacitor C1 mainly plays a filtering role here. One end of the second resistor R2 is coupled to one end of the first capacitor C1, and the other end is coupled to the other end of the first capacitor C1 through the third resistor R3. The second resistor R2 can further filter out high-frequency noise, and can also perform appropriate voltage division on the power input signal.

[0104] The common mode suppression inductor T2 is a dual-winding device, including a first winding and a second winding that are independent of each other. 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 of the common mode suppression inductor T2 is coupled to the output terminal of the live wire input terminal L, and the seventh terminal 7 is coupled to the output terminal of the neutral wire input terminal N. The common mode suppression inductor T2 can effectively eliminate the common mode interference signal in the power supply input and improve the anti-interference ability of the power supply circuit.

[0105] Optional, in Figure 1 In the embodiment, the power supply circuit includes: a first diode D1, a first energy storage filter capacitor EC1 and a second capacitor C2.

[0106] An anode of the first diode D1 is coupled to the third terminal 3 via a fourth resistor R4 , and a cathode of the first diode D1 is coupled to the power supply terminal VDD.

[0107] The positive electrode of the first energy storage filter capacitor EC1 is coupled to the negative electrode of the first diode D1 , and the negative electrode of the first energy storage filter capacitor EC1 is coupled to the fourth end 4 .

[0108] The second capacitor C2 is connected in parallel with the first energy storage filter capacitor EC1.

[0109] Specifically, in some embodiments, the power supply circuit includes a first diode D1, a first energy storage filter capacitor EC1 and a second capacitor C2 to achieve effective rectification and filtering of the output voltage of the auxiliary coil of the transformer T1, ensuring that the power chip obtains a stable and pure DC voltage.

[0110] The first diode D1 is used as a rectifying element, and its positive electrode is coupled to the third terminal 3 of the auxiliary coil of the transformer T1 through the fourth resistor R4 to achieve the function of half-wave rectification or full-wave rectification. The fourth resistor R4 plays the role of current limiting and voltage reduction here to protect the circuit from the impact of transient high voltage. The cathode of the first diode D1 is coupled to the power supply terminal VDD of the power chip, and the rectified pulsating DC voltage is provided to the power chip as a working power supply.

[0111] The first energy storage filter capacitor EC1 is configured between the cathode of the first diode D1 and the fourth terminal 4, with its anode coupled to the cathode of the first diode D1 and its cathode coupled to the fourth terminal 4 (usually the ground terminal GND). The first energy storage filter capacitor EC1 is mainly used to store and release energy, smooth the pulsating voltage after rectification, and convert it into a relatively gentle DC voltage.

[0112] The second capacitor C2 is connected in parallel with the first energy storage filter capacitor EC1, and the two together form a filter capacitor network, which further enhances the filtering effect on the power supply voltage of the power chip and improves the power quality.

[0113] Optional, in Figure 1 In the embodiment, a second energy storage filter capacitor EC2 and an RCD absorption circuit are further provided between the output end of the interference suppression circuit and the primary coil.

[0114] The positive electrode of the second energy storage filter capacitor EC2 is coupled to the first end 1 , and the negative electrode of the second energy storage filter capacitor EC2 is grounded.

[0115] exist Figure 1 In the embodiment, the RCD absorption circuit includes: a third capacitor C3, a second diode D2 and a fifth resistor R5.

[0116] One end of the third capacitor C3 is coupled to the first end 1 .

[0117] A cathode of the second diode D2 is coupled to the other end of the third capacitor C3 via a fourth resistor R4 , and an anode of the second diode D2 is coupled to the power input terminal SW.

[0118] One end of the fifth resistor R5 is coupled to the first end 1 , and the other end of the fifth resistor R5 is coupled to the fourth resistor R4 .

[0119] Specifically, in some embodiments, the second energy storage filter capacitor EC2 is placed between the output end of the interference suppression circuit and the primary coil, with its positive electrode coupled to the first end 1 of the primary coil and its negative electrode grounded. The second energy storage filter capacitor EC2 is mainly used to store and release electrical energy to ensure that the voltage sent to the primary coil is more stable, thereby improving the stability and efficiency of the power supply.

[0120] The RCD absorption circuit includes a third capacitor C3, a second diode D2 and a fifth resistor R5 to absorb and suppress voltage spikes and surge currents that may occur during the power conversion process.

[0121] One end of the third capacitor C3 is coupled to the first end 1 of the primary coil for storing and releasing charge. The cathode of the second diode D2 is coupled to the other end of the third capacitor C3 through the fourth resistor R4. When the voltage is reversed, the second diode D2 is turned on, and the excess voltage energy is consumed through the fourth resistor R4 to achieve the purpose of suppressing the voltage spike. One end of the fifth resistor R5 is also coupled to the first end 1 of the primary coil, and the other end is coupled to the fourth resistor R4, which is conducive to limiting the current size when the second diode D2 is turned on, ensuring the safety of the RCD absorption circuit, and assisting the fourth resistor R4 to complete the voltage absorption task.

[0122] Optionally, the overcurrent detection circuit includes: a sixth resistor R6 and a seventh resistor R7.

[0123] One end of the sixth resistor R6 is coupled to the over-current detection terminal CS, and the other end of the sixth resistor R6 is grounded.

[0124] The seventh resistor R7 is connected in parallel with the sixth resistor R6.

[0125] Specifically, in some embodiments, the current detection circuit includes a sixth resistor R6 and a seventh resistor R7, which are used to monitor and limit the current in the circuit in real time to prevent overcurrent from damaging the power chip.

[0126] One end of the sixth resistor R6 is coupled to the overcurrent detection terminal CS of the power chip. The other end of the sixth resistor R6 is grounded to form a current detection channel. When the current in the circuit is too large, the voltage drop generated by the sixth resistor R6 will increase significantly, and this voltage change will be captured by the power chip and respond accordingly.

[0127] The seventh resistor R7 is connected in parallel with the sixth resistor R6, and the two together form a voltage divider network. Under the premise of not affecting the current detection sensitivity, the power borne by the resistors in the overcurrent condition can be dispersed, thereby preventing a single resistor from burning out due to long-term high current operation, and also helping to improve the reliability of overcurrent detection.

[0128] Optionally, a fourth capacitor C4 is further disposed between the feedback terminal FB and the ground terminal GND, one end of the fourth capacitor C4 is coupled to the feedback terminal FB, and the other end of the fourth capacitor C4 is grounded.

[0129] Specifically, in some embodiments, one end of the fourth capacitor C4 is coupled to the detection end to capture and temporarily store the instantaneous detection signal. The other end of the fourth capacitor C4 is grounded, so that the detection signal transmitted to the ground end GND is smoother and more accurate.

[0130] 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.

[0131] The at least one output circuit comprises a first output circuit, Figure 1 In the embodiment, the first output circuit includes: a third diode D3, a third energy storage filter capacitor EC3, a ninth resistor R9 and a tenth resistor R10.

[0132] An anode of the third diode D3 is coupled to the ninth terminal 9 , and a cathode of the third diode D3 is coupled to the external load F0 via the first inductor L1 .

[0133] A positive electrode of the third energy storage filter capacitor EC3 is coupled to one end of the first inductor L1 , and a negative electrode of the third energy storage filter capacitor EC3 is grounded.

[0134] A fourth energy storage filter capacitor EC4 , a fifth capacitor C5 , and an eighth resistor R8 are sequentially connected in parallel between the external load F0 and the power ground terminal GND.

[0135] A positive electrode of the fourth energy storage filter capacitor EC4 is coupled to the other end of the first inductor L1 , and a negative electrode of the fourth energy storage filter capacitor EC4 is grounded.

[0136] The connection point between the cathode of the third diode D3 and the first inductor L1 leads to the secondary output terminal.

[0137] One end of the ninth resistor R9 is coupled to the anode of the third diode D3 , and the other end of the ninth resistor R9 is coupled to the cathode of the third diode D3 via a sixth capacitor C6 .

[0138] The tenth resistor R10 is connected in parallel with the ninth resistor R9.

[0139] Specifically, in some embodiments, the first output circuit includes a third diode D3, a third energy storage filter capacitor EC3, a ninth resistor R9, a tenth resistor R10, and a first inductor L1.

[0140] The positive electrode of the third diode D3 is coupled to the ninth end 9 of the first secondary coil, and the negative electrode thereof is connected to the external load F0 through the first inductor L1, forming an energy conversion and transfer link from the primary side to the secondary side. The positive electrode of the third energy storage filter capacitor EC3 is coupled to one end of the first inductor L1, and the negative electrode is grounded, which is used to store and release energy, filter out ripples in the output voltage, and improve the stability of the power supply output.

[0141] Between the external load F0 and the power ground terminal GND, the fourth energy storage filter capacitor EC4, the fifth capacitor C5 and the eighth resistor R8 are connected in parallel in sequence. Among them, the positive electrode of the fourth energy storage filter capacitor EC4 is connected to the other end of the first inductor L1, and the negative electrode is grounded. The ninth resistor R9 is connected to the third diode D3, one end of which is coupled to the positive electrode of the third diode D3, and the other end is coupled to the negative electrode of the third diode D3 through the sixth capacitor C6. The connection point between the first inductor L1 is defined as the secondary output terminal, which helps to improve the transient response characteristics of the circuit. The tenth resistor R10 is connected in parallel with the ninth resistor R9, and acts together in the circuit, which can be used for voltage division or providing additional filtering effects.

[0142] 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.

[0143] The at least one output circuit includes a second output circuit, Figure 1In the embodiment, the second output circuit includes: a fourth diode D4, a fifth energy storage filter capacitor EC5, a twelfth resistor R12 and a thirteenth resistor R13.

[0144] An anode of the fourth diode D4 is coupled to the eleventh terminal 11 , and a cathode of the fourth diode D4 is coupled to the external load F0 via a second inductor L2 .

[0145] The positive electrode of the fifth energy storage filter capacitor EC5 is coupled to one end of the second inductor L2 , and the negative electrode of the fifth energy storage filter capacitor EC5 is grounded through the power ground terminal GND.

[0146] A sixth energy storage filter capacitor EC6 , a seventh capacitor C7 , and an eleventh resistor R11 are sequentially connected in parallel between the external load F0 and the power ground terminal GND.

[0147] The positive electrode of the sixth energy storage filter capacitor EC6 is coupled to the other end of the second inductor L2 , and the negative electrode of the sixth energy storage filter capacitor EC6 is grounded through the power ground terminal GND.

[0148] One end of the twelfth resistor R12 is coupled to the fourth diode D4 , and the other end of the twelfth resistor R12 is coupled to the cathode of the fourth diode D4 via an eighth capacitor C8 .

[0149] The thirteenth resistor R13 is connected in parallel with the twelfth resistor R12.

[0150] Specifically, in some embodiments, the at least one secondary coil may include a second secondary coil, and the second secondary coil includes an eleventh terminal 11 and a twelfth terminal 12. The at least one output circuit includes a second output circuit for processing an output signal from the second secondary coil.

[0151] exist Figure 1 In the illustrated embodiment, the second output circuit includes a fourth diode D4, a fifth energy storage filter capacitor EC5, a twelfth resistor R12, a thirteenth resistor R13 and a second inductor L2.

[0152] The anode of the fourth diode D4 is coupled to the eleventh terminal 11 of the second secondary coil, and the cathode of the fourth diode D4 is connected to the external load F0 through the second inductor L2, forming a power transmission path from the secondary side to the load. The anode of the fifth energy storage filter capacitor EC5 is coupled to one end of the second inductor L2, and its cathode is grounded through the power ground terminal GND, which is used to filter and stabilize the output voltage to ensure the continuity and stability of the power output.

[0153] The sixth energy storage filter capacitor EC6, the seventh capacitor C7 and the eleventh resistor R11 are connected in parallel between the external load F0 and the power ground terminal GND. Among them, the positive electrode of the sixth energy storage filter capacitor EC6 is connected to the other end of the second inductor L2, and its negative electrode is grounded through the power ground terminal GND, further improving the power output quality and load adaptability. One end of the twelfth resistor R12 is connected to the fourth diode D4, and the other end thereof is coupled to the negative electrode of the fourth diode D4 through the eighth capacitor C8; the thirteenth resistor R13 is connected in parallel with the twelfth resistor R12 for voltage division.

[0154] Optionally, the voltage-regulated output power supply circuit further includes an eighth capacitor C8 , one end of the eighth capacitor C8 is coupled to the first end 1 , and the other end of the eighth capacitor C8 is coupled to the tenth end 10 .

[0155] Specifically, in some embodiments, one end of the eighth capacitor C8 is coupled to the ninth end 9 of the first secondary coil, and the other end of the eighth capacitor C8 is coupled to the tenth end 10 of the first secondary coil. The eighth capacitor C8 can form a decoupling path at both ends of the first secondary coil, which can effectively filter out high-frequency noise and play a role in voltage stabilization to prevent voltage fluctuations from affecting subsequent circuits.

[0156] 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. A voltage-stabilized output power supply circuit, characterized in that: include: An input circuit, wherein an input end of the input circuit is connected to an external power supply; an interference suppression circuit, wherein an input terminal of the interference suppression circuit is coupled to an output terminal of the input circuit; A transformer, the transformer comprising a primary coil, an auxiliary coil and at least one secondary coil; The primary coil includes a first end and a second end; the auxiliary coil includes a third end and a fourth end; The output end of the interference suppression circuit is coupled to the first end through a rectifier bridge; A power chip, the power chip comprising a power input 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 overcurrent detection terminal is grounded through an overcurrent detection circuit; and the ground terminal is grounded; At least one output circuit, the output end of each output circuit is coupled to an external load and a circuit ground end; the input end of each output circuit is coupled to one of the secondary coils; A voltage stabilization feedback circuit, the voltage stabilization feedback circuit comprising: An optical coupler assembly, the optical coupler assembly comprising a transmitter and a receiver; One end of the receiver is coupled to the feedback end, and the other end of the receiver is grounded; one end of the transmitter is grounded; A first Zener diode, wherein the anode of the first Zener diode is coupled to the other end of the transmitter, and the cathode of the first Zener diode is coupled to a secondary output terminal between an input terminal and an output terminal of an input circuit of the at least one output circuit through a first resistor.

2. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The input circuit comprises: A live wire input terminal, wherein an input terminal of the live wire input terminal is connected to an external power supply, and an output terminal of the live wire input terminal is coupled to an input terminal of the interference suppression circuit through a first fuse; A neutral line input terminal, an input terminal of the neutral line input terminal is grounded, and an output terminal of the neutral line input terminal is coupled to an input terminal of the interference suppression circuit through a second fuse.

3. The voltage-stabilized output power supply circuit according to claim 2, characterized in that: The interference suppression circuit comprises: An adjustable resistor, one end of which is coupled to the output end of the live line input end, and the other end of which is coupled to the output end of the neutral line input end; A first capacitor, the first capacitor is connected in parallel with the adjustable resistor; a second resistor, one end of the second resistor being coupled to one end of the first capacitor, and the other end of the second resistor being coupled to the other end of the first capacitor via a third 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 output end of the live line input end, and the seventh end is coupled to the output end of the neutral line input end.

4. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The power supply circuit comprises: a first diode, wherein an anode of the first diode is coupled to the third end via a fourth resistor, and a cathode of the first diode is coupled to the power supply end; a first energy storage filter capacitor, wherein a positive electrode of the first energy storage filter capacitor is coupled to a negative electrode of the first diode, and a negative electrode of the first energy storage filter capacitor is coupled to the fourth end; A second capacitor is connected in parallel with the first energy storage filter capacitor.

5. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: Also provided between the output end of the interference suppression circuit and the primary coil is: A second energy storage filter capacitor, wherein a positive electrode of the second energy storage filter capacitor is coupled to the first end, and a negative electrode of the second energy storage filter capacitor is grounded; RCD absorption circuit, the RCD absorption circuit comprising: a third capacitor, one end of the third capacitor being coupled to the first end; a second diode, wherein a cathode of the second diode is coupled to the other end of the third capacitor via a fourth resistor, and an anode of the second diode is coupled to the power input terminal; A fifth resistor, one end of the fifth resistor is coupled to the first end, and the other end of the fifth resistor is coupled to the fourth resistor.

6. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The overcurrent detection circuit includes: a sixth resistor, one end of the sixth resistor being coupled to the overcurrent detection end, and the other end of the sixth resistor being grounded; A seventh resistor is connected in parallel with the sixth resistor.

7. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: A fourth capacitor is further disposed between the feedback terminal and the ground terminal, one end of the fourth capacitor is coupled to the feedback terminal, and the other end of the fourth capacitor is grounded.

8. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The at least one secondary coil includes a first secondary coil; the first secondary coil includes a ninth end and a tenth end; the at least one output circuit includes a first output circuit, and the first output circuit includes: a third diode, wherein an anode of the third diode is coupled to the ninth terminal, and a cathode of the third diode is coupled to an external load via a first inductor; a third energy storage filter capacitor, wherein a positive electrode of the third energy storage filter capacitor is coupled to one end of the first inductor, and a negative electrode of the third energy storage filter capacitor is grounded; A fourth energy storage filter capacitor, a fifth capacitor and an eighth resistor are sequentially connected in parallel between the external load and the power ground terminal; The positive electrode of the fourth energy storage filter capacitor is coupled to the other end of the first inductor, and the negative electrode of the fourth energy storage filter capacitor is grounded; The connection point between the cathode of the third diode and the first inductor leads to the secondary output terminal; a ninth resistor, one end of the ninth resistor being coupled to the anode of the third diode, and the other end of the ninth resistor being coupled to the cathode of the third diode via a sixth capacitor; A tenth resistor is connected in parallel with the ninth resistor.

9. The voltage-stabilized output 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 includes a second output circuit, and the second output circuit includes: a fourth diode, wherein an anode of the fourth diode is coupled to the eleventh terminal, and a cathode of the fourth diode is coupled to the external load via a second inductor; a fifth energy storage filter capacitor, wherein a positive electrode of the fifth energy storage filter capacitor is coupled to one end of the second inductor, and a negative electrode of the fifth energy storage filter capacitor is grounded through the power supply ground terminal; A sixth energy storage filter capacitor, a seventh capacitor and an eleventh resistor are sequentially connected in parallel between the external load and the power ground terminal; The positive electrode of the sixth energy storage filter capacitor is coupled to the other end of the second inductor, and the negative electrode of the sixth energy storage filter capacitor is grounded through the power ground terminal; a twelfth resistor, one end of the twelfth resistor is coupled to the fourth diode, and the other end of the twelfth resistor is coupled to the cathode of the fourth diode via an eighth capacitor; A thirteenth resistor is connected in parallel with the twelfth resistor.

10. The voltage-stabilized output power supply circuit according to claim 1, characterized in that: The voltage-regulated output power supply circuit further includes an eighth capacitor, one end of the eighth capacitor is coupled to the first end, and the other end of the eighth capacitor is grounded.

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