Voltage output circuit

Abstract

According to the voltage output circuit provided by the utility model, the multi-stage transformer and the dual-channel voltage comparator are combined, and the first voltage output end and the second voltage output end of the multi-stage transformer respectively output two voltage values to the dual-channel voltage comparator. The first output end and the second output end of the dual-channel voltage comparator are electrically connected with the controlled end of the first switch unit and the controlled end of the second switch unit respectively. Therefore, the dual-channel voltage comparator can select the first output end or the second output end to output an electric signal by comparing two voltage values respectively output by the first voltage output end and the second voltage output end with the reference voltage input by the comparison voltage input end, so that under the condition that the input voltage of the power supply fluctuates, the output voltage of the power supply is not changed. The voltage closest to the reference voltage can be selected as much as possible for output, the stability of the output voltage is effectively guaranteed, and fluctuation is reduced as much as possible.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, specifically to a voltage output circuit. Background Technology

[0002] In electronic devices, voltage output circuits are a key component for realizing electrical energy conversion and distribution. Traditional voltage output circuits typically use transformers to achieve voltage leveling. Transformers convert input voltage into the required output voltage through the principle of electromagnetic induction and are widely used in power adapters, power systems, communication equipment, and other fields.

[0003] However, using a transformer as the core component of a voltage output circuit presents some inherent technical problems, particularly regarding output voltage stability. Traditional transformer-based voltage output circuits suffer from numerous technical issues related to output voltage stability, which not only affect circuit performance but may also adversely impact equipment reliability and lifespan.

[0004] Therefore, there is an urgent need for a new type of voltage output circuit that can provide a stable and reliable output voltage under various operating conditions to meet the high power quality requirements of modern electronic equipment. Utility Model Content

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a voltage output circuit, including a control chip, a power supply, and a drive circuit, wherein the input terminal of the drive circuit is electrically connected to the output terminal of the power supply, and the controlled terminal of the drive circuit is electrically connected to the control terminal of the control chip; the voltage output circuit further includes:

[0006] A multi-stage transformer, comprising a voltage input terminal, a first voltage output terminal, and a second voltage output terminal, wherein the voltage input terminal is electrically connected to the output terminal of the drive circuit;

[0007] A dual-channel voltage comparator includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a comparison voltage input terminal. The first voltage output terminal is electrically connected to the first input terminal, the second voltage output terminal is electrically connected to the second input terminal, and the comparison voltage input terminal is used to input a reference voltage.

[0008] The switching circuit includes a first switching unit and a second switching unit. The controlled terminal of the first switching unit is electrically connected to the first output terminal, and the input terminal of the first switching unit is electrically connected to the first voltage output terminal. The controlled terminal of the second switching unit is electrically connected to the second output terminal, and the input terminal of the second switching unit is electrically connected to the second voltage output terminal. The output terminals of the first switching unit and the second switching unit are the output terminals of the voltage output circuit.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This technical solution introduces an existing multi-stage transformer and a dual-channel voltage comparator into the voltage output circuit for the first time, electrically connecting the first and second voltage output terminals of the multi-stage transformer to the first and second input terminals of the dual-channel voltage comparator, respectively. Firstly, the first and second voltage output terminals of the multi-stage transformer output two voltage values ​​to the dual-channel voltage comparator. Since the first and second output terminals of the dual-channel voltage comparator are electrically connected to the controlled terminals of the first and second switching units, respectively, when the first output terminal outputs an electrical signal, the first voltage output terminal of the multi-stage transformer can output a voltage through the output terminal of the first switching unit; similarly, when the second output terminal outputs an electrical signal, the second voltage output terminal of the multi-stage transformer can output a voltage through the output terminal of the second switching unit. Therefore, since the dual-channel voltage comparator can compare the two voltage values ​​output by the first voltage output terminal and the second voltage output terminal with the reference voltage input by the comparison voltage input terminal, and select the first output terminal or the second output terminal to output an electrical signal, it can select the voltage closest to the reference voltage as much as possible when the input voltage of the power supply fluctuates, thus effectively ensuring the stability of the output voltage and minimizing fluctuations.

[0010] Furthermore, the voltage output circuit also includes a first resistor RH24 and a first capacitor CH23;

[0011] The comparison voltage input terminal is electrically connected to the first terminal of the first resistor RH24 and the second terminal of the first capacitor CH23. The second terminal of the first resistor RH24 is used to input the reference voltage, and the first terminal of the first capacitor CH23 is grounded.

[0012] Furthermore, the first switching unit is a first MOSFET QH16, the gate of the first MOSFET QH16 is electrically connected to the first output terminal, the source of the first MOSFET QH16 is electrically connected to the first voltage output terminal, and the drain of the first MOSFET QH16 is the output terminal of the first switching unit.

[0013] The second switching unit is a second MOSFET QH11. The gate of the second MOSFET QH11 is electrically connected to the second output terminal, the source of the second MOSFET QH11 is electrically connected to the second voltage output terminal, and the drain of the second MOSFET QH11 is the output terminal of the second switching unit.

[0014] Furthermore, the driving circuit includes a third MOSFET QH7 and a fourth MOSFET QH12, and the control chip includes a first control terminal and a second control terminal; the gate of the third MOSFET QH7 is electrically connected to the first control terminal, the source of the third MOSFET QH7 is electrically connected to the output terminal of the power supply, the drain of the third MOSFET QH7 is electrically connected to the source of the fourth MOSFET QH12 and the voltage input terminal of the multi-stage transformer, the gate of the fourth MOSFET QH12 is electrically connected to the second control terminal, and the drain of the fourth MOSFET QH12 is grounded.

[0015] Furthermore, the voltage output circuit also includes a surge absorption circuit, which includes a surge absorption input terminal and a surge absorption output terminal. The surge absorption input terminal of the surge absorption circuit is electrically connected to the output terminal of the first switching unit and the output terminal of the second switching unit. A charging capacitor is connected in parallel between the surge absorption output terminal and the surge absorption input terminal.

[0016] Furthermore, the surge absorption circuit also includes a fifth inductor LH5, and the surge absorption output terminal includes a first surge absorption output terminal and a second surge absorption output terminal, with the fifth inductor LH5 connected in series between the first surge absorption output terminal and the second surge absorption output terminal.

[0017] Furthermore, the voltage output circuit also includes a feedback circuit, which includes an optocoupler switch. The anode of the light-emitting diode of the optocoupler switch is electrically connected to the first surge absorption output terminal, the cathode of the light-emitting diode of the optocoupler switch is grounded, the collector of the optocoupler switch is connected to the output terminal of the control chip, and the emitter of the optocoupler switch is connected to the detection terminal of the control chip.

[0018] Furthermore, the feedback circuit also includes a Zener diode and a fifth MOSFET QH17. The second surge absorption output terminal is electrically connected to the input terminal of the Zener diode and the source of the fifth MOSFET QH17. The gate of the fifth MOSFET QH17 is the controlled terminal. The drain of the fifth MOSFET QH17 and the ground terminal of the Zener diode are connected to signal ground. The output terminal of the Zener diode is electrically connected to the cathode of the light-emitting diode of the optocoupler switch.

[0019] The voltage output circuit also includes a jitter elimination circuit, which includes a diode DH20, a transistor QH24, a first charging capacitor CH29, a second resistor RH169, a third resistor RH170, a second capacitor CH30, and a sixth MOSFET QH25.

[0020] The first surge absorption output terminal is electrically connected to the anode of the diode DH20, the base of the transistor QH24, and the source of the sixth MOSFET QH25. The emitter of the transistor QH24 is electrically connected to the cathode of the diode DH20 and the first terminal of the first charging capacitor CH29. The second terminal of the first charging capacitor CH29 is connected to signal ground. The collector of the transistor QH24 is electrically connected to the first terminal of the second resistor RH169. The second terminal of the second resistor RH169 is electrically connected to the first terminal of the second capacitor CH30, the first terminal of the third resistor RH170, and the gate of the sixth MOSFET QH25. The second terminal of the second capacitor CH30, the second terminal of the third resistor RH170, and the drain of the sixth MOSFET QH25 are connected to signal ground.

[0021] Furthermore, the dual-channel voltage comparator is model LM393. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 A circuit diagram of a voltage output circuit provided by this utility model;

[0024] Figure 2 A circuit example diagram of a dual-channel voltage comparator and its peripheral circuitry for a voltage output circuit provided by this utility model;

[0025] Figure 3 A circuit example diagram of a voltage output circuit driver circuit, a multi-stage transformer, a switching circuit, and a surge absorption circuit provided by this utility model;

[0026] Figure 4 A circuit example diagram of the control chip and feedback circuit for a voltage output circuit provided by this utility model;

[0027] Figure 5 A circuit example diagram of a jitter elimination circuit for a voltage output circuit provided by this utility model.

[0028] In the diagram: 1. Control chip; 2. Power supply; 3. Drive circuit; 4. Multi-stage transformer; 5. Dual-channel voltage comparator; 6. Switching circuit; 7. Surge absorption circuit; 8. Feedback circuit. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In this specification, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In electronic devices, voltage output circuits are a key component for realizing electrical energy conversion and distribution. Traditional voltage output circuits typically use transformers to achieve voltage leveling. Transformers convert input voltage into the required output voltage through the principle of electromagnetic induction and are widely used in power adapters, power systems, communication equipment, and other fields.

[0035] However, using a transformer as the core component of a voltage output circuit presents some inherent technical problems, particularly regarding the stability of the output voltage. The following are some of the main technical issues:

[0036] 1. Voltage fluctuations caused by load changes: When the load changes, the transformer's output voltage often fluctuates accordingly. For example, when the load current suddenly increases, the output voltage may drop; conversely, when the load current decreases, the output voltage may rise. This fluctuation can lead to instability in the operation of subsequent circuits and may even damage sensitive components.

[0037] 2. Impact of Input Voltage Fluctuations: The output voltage of a transformer is affected not only by load changes but also by input voltage fluctuations. If the input voltage is unstable, the transformer's output voltage will also fluctuate, further exacerbating the instability of the output voltage.

[0038] 3. Parameter drift caused by temperature changes: The operating performance of a transformer is significantly affected by temperature. As the temperature rises, the resistance of the transformer core and windings changes, leading to a drift in the output voltage. This temperature-induced parameter drift is particularly pronounced in high or low temperature environments, affecting the long-term stability of the circuit.

[0039] 4. Magnetic saturation problem: When the input voltage of the transformer is too high or the load current is too large, the transformer core may enter a state of magnetic saturation. In a state of magnetic saturation, the output voltage of the transformer will drop sharply, causing the circuit to malfunction. Magnetic saturation not only affects the stability of the output voltage but may also damage the transformer itself.

[0040] In summary, traditional transformer-based voltage output circuits suffer from numerous technical problems regarding output voltage stability. These issues not only affect circuit performance but may also adversely impact equipment reliability and lifespan. Therefore, there is an urgent need for a novel voltage output circuit capable of providing stable and reliable output voltage under various operating conditions to meet the high power quality requirements of modern electronic equipment.

[0041] like Figures 1-3As shown, this utility model provides a voltage output circuit, including a control chip 1, a power supply 2, and a drive circuit 3. The input terminal of the drive circuit 3 is electrically connected to the output terminal of the power supply 2, and the controlled terminal of the drive circuit 3 is electrically connected to the control terminal of the control chip 1. The voltage output circuit further includes:

[0042] The multi-stage transformer 4 includes a voltage input terminal, a first voltage output terminal, and a second voltage output terminal. The voltage input terminal is electrically connected to the output terminal of the drive circuit 3.

[0043] A dual-channel voltage comparator 5 includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a comparison voltage input terminal. The first voltage output terminal is electrically connected to the first input terminal, and the second voltage output terminal is electrically connected to the second input terminal. The comparison voltage input terminal is used to input a reference voltage.

[0044] The switching circuit 6 includes a first switching unit and a second switching unit. The controlled terminal of the first switching unit is electrically connected to the first output terminal, and the input terminal of the first switching unit is electrically connected to the first voltage output terminal. The controlled terminal of the second switching unit is electrically connected to the second output terminal, and the input terminal of the second switching unit is electrically connected to the second voltage output terminal. The output terminals of the first switching unit and the second switching unit are the output terminals of the voltage output circuit.

[0045] This technical solution combines an existing multi-stage transformer 4 and a dual-channel voltage comparator 5 into the voltage output circuit for the first time. The first and second voltage output terminals of the multi-stage transformer 4 are electrically connected to the first and second input terminals of the dual-channel voltage comparator 5, respectively. Firstly, the first and second voltage output terminals of the multi-stage transformer 4 output two voltage values ​​to the dual-channel voltage comparator 5. Since the first and second output terminals of the dual-channel voltage comparator 5 are electrically connected to the controlled terminals of the first and second switching units, respectively, when the first output terminal outputs an electrical signal, the first voltage output terminal of the multi-stage transformer 4 can output a voltage through the output terminal of the first switching unit; similarly, when the second output terminal outputs an electrical signal, the second voltage output terminal of the multi-stage transformer 4 can output a voltage through the output terminal of the second switching unit. Therefore, since the dual-channel voltage comparator 5 can compare the two voltage values ​​output by the first voltage output terminal and the second voltage output terminal with the reference voltage input by the comparison voltage input terminal, and select the first output terminal or the second output terminal to output an electrical signal, it can select the voltage closest to the reference voltage as much as possible when the input voltage of the power supply fluctuates, effectively ensuring the stability of the output voltage and minimizing fluctuations.

[0046] Specifically, in one embodiment, such as Figure 2 As shown, UH1 is a dual-channel voltage comparator 5. The GDA terminal is the first output, the GDB terminal is the second output, the DSA terminal is the first input, the DSB terminal is the second input, and the VCC terminal is the comparison voltage input. The dual-channel voltage comparator 5 has the following functions:

[0047] The voltages input to the first and second input terminals are compared with the comparison voltage input terminal, and the first and second output terminals are selected to output electrical signals based on the comparison result.

[0048] Specifically, if the first input terminal is closer to the comparison voltage input terminal, the first input terminal and the first output terminal are connected, and an electrical signal is output from the first output terminal; if the second input terminal is closer to the comparison voltage input terminal, the second input terminal and the second output terminal are connected, and an electrical signal is output from the second output terminal.

[0049] Preferably, such as Figure 2 As shown, the voltage output circuit also includes a first resistor RH24 and a first capacitor CH23;

[0050] The comparison voltage input terminal is electrically connected to the first terminal of the first resistor RH24 and the second terminal of the first capacitor CH23. The second terminal of the first resistor RH24 is used to input the reference voltage, and the first terminal of the first capacitor CH23 is grounded.

[0051] Specifically, the first resistor RH24 and the first capacitor CH23 form a filter circuit.

[0052] Preferably, such as Figure 3 As shown, the first switching unit is a first MOS transistor QH16. The gate of the first MOS transistor QH16 is electrically connected to the first output terminal, the source of the first MOS transistor QH16 is electrically connected to the first voltage output terminal, and the drain of the first MOS transistor QH16 is the output terminal of the first switching unit.

[0053] The second switching unit is a second MOSFET QH11. The gate of the second MOSFET QH11 is electrically connected to the second output terminal, the source of the second MOSFET QH11 is electrically connected to the second voltage output terminal, and the drain of the second MOSFET QH11 is the output terminal of the second switching unit.

[0054] Preferably, such as Figure 3 and Figure 4As shown, the driving circuit 3 includes a third MOSFET QH7 and a fourth MOSFET QH12, and the control chip 1 includes a first control terminal and a second control terminal. The gate of the third MOSFET QH7 is electrically connected to the first control terminal, the source of the third MOSFET QH7 is electrically connected to the output terminal of the power supply 2, the drain of the third MOSFET QH7 is electrically connected to the source of the fourth MOSFET QH12 and the voltage input terminal of the multi-stage transformer 4, the gate of the fourth MOSFET QH12 is electrically connected to the second control terminal, and the drain of the fourth MOSFET QH12 is grounded.

[0055] Among them, the first control terminal is Figure 3 and Figure 4 The second control terminal of the LLCA-385V-DRVH is... Figure 3 and Figure 4 The LLCA-DRVL terminal in the middle.

[0056] Preferably, the voltage output circuit further includes a surge absorption circuit 7, which includes a surge absorption input terminal and a surge absorption output terminal. The surge absorption input terminal of the surge absorption circuit 7 is electrically connected to the output terminal of the first switching unit and the output terminal of the second switching unit. A charging capacitor is connected in parallel between the surge absorption output terminal and the surge absorption input terminal.

[0057] When a sudden high voltage occurs in the circuit, i.e. a surge voltage, the surge absorption circuit 7 can quickly respond to and absorb these voltages, effectively preventing circuit components from being damaged by high voltage.

[0058] Preferably, the surge absorption circuit 7 further includes a fifth inductor LH5, and the surge absorption output terminal includes a first surge absorption output terminal and a second surge absorption output terminal, with the fifth inductor LH5 connected in series between the first surge absorption output terminal and the second surge absorption output terminal.

[0059] Preferably, such as Figure 4 As shown, the voltage output circuit further includes a feedback circuit 8, which includes an optocoupler switch. The anode of the light-emitting diode of the optocoupler switch is electrically connected to the first surge absorption output terminal, the cathode of the light-emitting diode of the optocoupler switch is grounded, the collector of the optocoupler switch is connected to the output terminal of the control chip 1, and the emitter of the optocoupler switch is connected to the detection terminal of the control chip 1.

[0060] Among them, the detection end of control chip 1 is Figure 4The FB pin in the middle can detect the presence of an electrical signal to determine whether the entire output voltage is properly short-circuited and outputs a stable voltage. Furthermore, the optocoupler switch serves as both an isolation mechanism and a signal transmission hub. The optocoupler switch converts the electrical signal from the input circuit into an optical signal via photoelectric conversion, and then uses this optical signal to control the operating state of the output circuit. This conversion mechanism provides electrical isolation, effectively preventing interference and damage from high-voltage circuits to low-voltage circuits, thus improving circuit stability and safety.

[0061] Preferably, the feedback circuit 8 further includes a Zener diode and a fifth MOSFET QH17. The second surge absorption output terminal is electrically connected to the input terminal of the Zener diode and the source of the fifth MOSFET QH17. The gate of the fifth MOSFET QH17 is the controlled terminal. The drain of the fifth MOSFET QH17 and the ground terminal of the Zener diode are connected to signal ground. The output terminal of the Zener diode is electrically connected to the cathode of the light-emitting diode of the optocoupler switch.

[0062] The voltage output circuit also includes a jitter elimination circuit, which includes a diode DH20, a transistor QH24, a first charging capacitor CH29, a second resistor RH169, a third resistor RH170, a second capacitor CH30, and a sixth MOSFET QH25.

[0063] The first surge absorption output terminal is electrically connected to the anode of the diode DH20, the base of the transistor QH24, and the source of the sixth MOSFET QH25. The emitter of the transistor QH24 is electrically connected to the cathode of the diode DH20 and the first terminal of the first charging capacitor CH29. The second terminal of the first charging capacitor CH29 is connected to signal ground. The collector of the transistor QH24 is electrically connected to the first terminal of the second resistor RH169. The second terminal of the second resistor RH169 is electrically connected to the first terminal of the second capacitor CH30, the first terminal of the third resistor RH170, and the gate of the sixth MOSFET QH25. The second terminal of the second capacitor CH30, the second terminal of the third resistor RH170, and the drain of the sixth MOSFET QH25 are connected to signal ground.

[0064] Specifically, the main function of the jitter cancellation circuit is to eliminate malfunctions caused by mechanical contact jitter, ensuring stable signal transmission. In electronic devices, especially those involving mechanical contacts such as buttons and switches, unstable signal output is often generated due to contact jitter. This jitter signal may lead to device malfunction or performance degradation. Therefore, the jitter cancellation circuit provided in this embodiment can ensure stable signal transmission.

[0065] Preferably, the dual-channel voltage comparator is an LM393. The LM393 is a widely used dual-channel voltage comparator integrated circuit, manufactured by multiple companies, and features low power consumption, high accuracy, and a wide operating voltage range. It is commonly used in analog signal processing, voltage detection, level shifting, oscillator circuits, and various control systems. The core function of the LM393 is to compare two input voltages and output a high or low level signal based on the comparison result, thus playing an important role in many electronic circuits.

[0066] Preferably, the control chip is model FA6B20N. The FA6B20N is a high-frequency LLC resonant half-bridge controller launched by MEGMEET, designed specifically for high-efficiency switching power supplies, suitable for industrial power supplies, communication equipment, and high-precision voltage output systems. Its core function is to achieve soft-switching operation through resonant topology, significantly reducing switching losses and improving system efficiency, while supporting a wide input voltage range and high-precision voltage regulation control.

[0067] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted. Furthermore, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0068] It is understood that the term "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0069] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A voltage output circuit, comprising a control chip (1), a power supply (2), and a drive circuit (3), wherein the input terminal of the drive circuit (3) is electrically connected to the output terminal of the power supply (2), and the controlled terminal of the drive circuit (3) is electrically connected to the control terminal of the control chip (1), characterized in that, The voltage output circuit also includes: A multi-stage transformer (4) includes a voltage input terminal, a first voltage output terminal, and a second voltage output terminal. The voltage input terminal is electrically connected to the output terminal of the drive circuit (3). A dual-channel voltage comparator (5) includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a comparison voltage input terminal. The first voltage output terminal is electrically connected to the first input terminal, and the second voltage output terminal is electrically connected to the second input terminal. The comparison voltage input terminal is used to input a reference voltage. The switching circuit (6) includes a first switching unit and a second switching unit. The controlled terminal of the first switching unit is electrically connected to the first output terminal, and the input terminal of the first switching unit is electrically connected to the first voltage output terminal. The controlled terminal of the second switching unit is electrically connected to the second output terminal, and the input terminal of the second switching unit is electrically connected to the second voltage output terminal. The output terminals of the first switching unit and the second switching unit are the output terminals of the voltage output circuit.

2. The voltage output circuit according to claim 1, characterized in that: The voltage output circuit also includes a first resistor RH24 and a first capacitor CH23; The comparison voltage input terminal is electrically connected to the first terminal of the first resistor RH24 and the second terminal of the first capacitor CH23. The second terminal of the first resistor RH24 is used to input the reference voltage, and the first terminal of the first capacitor CH23 is grounded.

3. The voltage output circuit according to claim 1, characterized in that: The first switching unit is a first MOSFET QH16. The gate of the first MOSFET QH16 is electrically connected to the first output terminal, the source of the first MOSFET QH16 is electrically connected to the first voltage output terminal, and the drain of the first MOSFET QH16 is the output terminal of the first switching unit. The second switching unit is a second MOSFET QH11. The gate of the second MOSFET QH11 is electrically connected to the second output terminal, the source of the second MOSFET QH11 is electrically connected to the second voltage output terminal, and the drain of the second MOSFET QH11 is the output terminal of the second switching unit.

4. A voltage output circuit according to claim 1, characterized in that: The driving circuit (3) includes a third MOS transistor QH7 and a fourth MOS transistor QH12. The control chip (1) includes a first control terminal and a second control terminal. The gate of the third MOS transistor QH7 is electrically connected to the first control terminal. The source of the third MOS transistor QH7 is electrically connected to the output terminal of the power supply (2). The drain of the third MOS transistor QH7 is electrically connected to the source of the fourth MOS transistor QH12 and the voltage input terminal of the multi-stage transformer (4). The gate of the fourth MOS transistor QH12 is electrically connected to the second control terminal. The drain of the fourth MOS transistor QH12 is grounded.

5. A voltage output circuit according to claim 1, characterized in that, The voltage output circuit also includes a surge absorption circuit (7), which includes a surge absorption input terminal and a surge absorption output terminal. The surge absorption input terminal of the surge absorption circuit (7) is electrically connected to the output terminal of the first switching unit and the output terminal of the second switching unit. A charging capacitor is connected in parallel between the surge absorption output terminal and the surge absorption input terminal.

6. A voltage output circuit according to claim 5, characterized in that, The surge absorption circuit (7) further includes a fifth inductor LH5, and the surge absorption output terminal includes a first surge absorption output terminal and a second surge absorption output terminal. The fifth inductor LH5 is connected in series between the first surge absorption output terminal and the second surge absorption output terminal.

7. A voltage output circuit according to claim 6, characterized in that, The voltage output circuit also includes a feedback circuit (8), which includes an optocoupler switch. The anode of the light-emitting diode of the optocoupler switch is electrically connected to the first surge absorption output terminal. The cathode of the light-emitting diode of the optocoupler switch is grounded. The collector of the optocoupler switch is connected to the output terminal of the control chip (1). The emitter of the optocoupler switch is connected to the detection terminal of the control chip (1).

8. A voltage output circuit according to claim 7, characterized in that, The feedback circuit (8) further includes a three-terminal Zener diode and a fifth MOSFET QH17. The second surge absorption output terminal is electrically connected to the input terminal of the three-terminal Zener diode and the source of the fifth MOSFET QH17. The gate of the fifth MOSFET QH17 is the controlled terminal. The drain of the fifth MOSFET QH17 and the ground terminal of the three-terminal Zener diode are connected to signal ground. The output terminal of the three-terminal Zener diode is electrically connected to the cathode of the light-emitting diode of the optocoupler switch.

9. A voltage output circuit according to claim 6, characterized in that, The voltage output circuit also includes a jitter elimination circuit, which includes a diode DH20, a transistor QH24, a first charging capacitor CH29, a second resistor RH169, a third resistor RH170, a second capacitor CH30, and a sixth MOSFET QH25. The first surge absorption output terminal is electrically connected to the anode of the diode DH20, the base of the transistor QH24, and the source of the sixth MOSFET QH25. The emitter of the transistor QH24 is electrically connected to the cathode of the diode DH20 and the first terminal of the first charging capacitor CH29. The second terminal of the first charging capacitor CH29 is connected to signal ground. The collector of the transistor QH24 is electrically connected to the first terminal of the second resistor RH169. The second terminal of the second resistor RH169 is electrically connected to the first terminal of the second capacitor CH30, the first terminal of the third resistor RH170, and the gate of the sixth MOSFET QH25. The second terminal of the second capacitor CH30, the second terminal of the third resistor RH170, and the drain of the sixth MOSFET QH25 are connected to signal ground.

10. A voltage output circuit according to claim 1, characterized in that, The dual-channel voltage comparator is model LM393.

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