Backflow prevention circuit of power supply module
By using the anti-reverse sink circuit of the field effect tube and the Or ing control chip in the power supply module, the problem of current backsinking in high-voltage application scenarios is solved, and an efficient and safe power system is realized, which expands the application range and improves the overall performance.
Patent Information
- Application Number
- CN202411870084.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-04-25
AI Technical Summary
In high-voltage application scenarios, it is difficult to effectively prevent current backsinking, resulting in low efficiency and heat dissipation problems. The application limitations of traditional diode solutions under high voltage are relatively large.
An anti-reverse sink circuit for power supply module is designed, using a field effect tube and an Or i ng control chip to dynamically monitor the current flow, and an effective anti-reverse sink of the current is achieved, and combined with a voltage stabilization protection circuit, ensuring the safety and efficiency of the circuit.
Effectively prevent current backsinking in high-voltage environments, significantly improve the efficiency of the power supply system, reduce heat dissipation needs, expand the application range of anti-reverse sinking circuits, and improve the performance of the overall system.
Smart Images
Figure CN119891723A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and in particular to an anti-backflow circuit of a power module. Background Art
[0002] In the fields of modern industrial control, railways, communications, new energy, etc., modular power supplies are becoming more and more important because they can adapt to the needs of different voltage levels. With the development of high-tech industries such as national defense, military industry, and electric vehicles, higher requirements are placed on the power level, power density, voltage level, volume, and reliability of power supplies. In order to improve the adaptability and versatility of power supplies, modular power supplies came into being, with features including highly standardized parameters and dimensions, small size, high power density, and ease of various combined applications.
[0003] In many cases, a single power module cannot meet the power requirements of the system, so multiple power modules need to be combined. To ensure that the system can still operate stably when any module fails, redundant power modules are usually included in the system design. When a module fails, the system can automatically switch to the redundant module to ensure continuous and safe operation of the system.
[0004] In order to protect itself when other modules fail and to enable the system to switch redundant modules safely and reliably, the power module usually integrates an anti-reverse circuit. The most common method is to connect a diode in series on the power bus to ensure that the current flows in one direction. However, as the power of the module power increases, the bus current becomes larger and larger, and the conduction power consumption of the diode also increases, which not only reduces the power efficiency, but also requires additional heat dissipation measures for the safety and reliability of the device.
[0005] The current method for reducing power loss and voltage drop usually only supports an operating voltage of around 100V, which limits its use in high-voltage application scenarios.
[0006] In order to solve the anti-backflow problem of high-voltage module power supply and maintain the simplicity and reliability of the circuit, it is particularly important to study anti-backflow circuits suitable for different output voltages. This will help improve the performance and efficiency of power modules in high-voltage applications, while reducing heat dissipation requirements and improving the performance of the overall system. Summary of the invention
[0007] In view of this, an embodiment of the present application provides a circuit for preventing backflow of a power module, which is designed to adapt to module power systems with different output voltages. Through this design, not only can the current backflow between power modules be effectively prevented under high-voltage conditions, but the efficiency of the entire power system can also be significantly improved. At least partially solve the problems of inefficiency and heat dissipation caused by the use of traditional diodes in the prior art, while overcoming the limitations of existing solutions in high-voltage applications.
[0008] The embodiment of the present application provides an anti-backfeed circuit of a power module, wherein the anti-backfeed circuit of the power module includes a power unit and an anti-backfeed control unit, wherein the power unit includes an input filter voltage stabilization circuit, a low-voltage switch tube Q1, a high-voltage switch tube Q2, a drive power supply V cc , a driving diode D1, a driving capacitor C1, a first driving voltage regulator ZD1 and an output filter voltage regulator circuit, one end of the input filter voltage regulator circuit is connected to the S end of the low-voltage switch tube Q1 and the driving power supply V of the switch tube cc The negative end of the input filter voltage stabilizing circuit is connected to the power ground; the D pole of the low voltage switch tube Q1 is respectively connected to the S pole of the high voltage switch tube Q2, one end of the driving capacitor C1 and the anode of the first driving voltage stabilizing tube ZD1, the D pole of the high voltage switch tube Q2 is connected to one end of the output filter voltage stabilizing circuit, and the driving power supply V cc The positive end is connected to the anode of the driving diode D1, and the cathode of the driving diode D1 is respectively connected to the other end of the driving capacitor C1, the cathode of the first driving voltage regulator ZD1, and the G pole of the high-voltage switch tube Q2; the other end of the output filtering voltage regulator circuit is connected to the power ground; the anti-backfeed control unit is connected to the low-voltage switch tube Q1.
[0009] According to a specific implementation of the embodiment of the present application, the anti-backflow control unit is configured as an Operating control chip.
[0010] According to a specific implementation of the embodiment of the present application, the Operating control chip includes a V g Pin, V s pin and V D pin, the V g The pin is connected to the G pole of the low voltage switch tube Q1, and the V s The pin is connected to the S pole of the low voltage switch tube Q1, and the V D The pin is connected to the D pole of the low voltage switch tube Q1.
[0011] According to a specific implementation method of an embodiment of the present application, the anti-backflow circuit of the power module also includes a voltage stabilization protection circuit, one end of the voltage stabilization protection circuit is connected to one end of the input filter voltage stabilization circuit, and the other end of the voltage stabilization protection circuit is connected to one end of the output filter voltage stabilization circuit.
[0012] According to a specific implementation method of an embodiment of the present application, the voltage stabilizing protection circuit includes a second driving voltage stabilizing tube ZD2, the anode of the second driving voltage stabilizing tube ZD2 is connected to one end of the input filtering voltage stabilizing circuit, and the cathode of the second driving voltage stabilizing tube ZD2 is connected to one end of the output filtering voltage stabilizing circuit.
[0013] According to a specific implementation of the embodiment of the present application, the input filter voltage stabilization circuit is configured as an input capacitor C in .
[0014] According to a specific implementation of the embodiment of the present application, the output filter voltage stabilization circuit is configured as an output capacitor C out .
[0015] Beneficial effects:
[0016] The anti-backflow circuit of the power module in the embodiment of the present application can adapt to occasions with different output voltages by using field effect tubes and anti-backflow control units, especially for high-voltage applications. The present application provides an effective solution, breaking through the application limitations of traditional anti-backflow circuits in high-voltage environments, and significantly expanding its scope of application. At the same time, compared with the traditional diode anti-backflow circuit, the anti-backflow circuit proposed in the present application has made significant progress in reducing power loss. By adopting advanced control strategies and optimized circuit design, the power loss in the on state is effectively reduced, thereby improving the overall efficiency of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 A circuit diagram of an anti-backflow circuit of a power module according to an embodiment of the present invention;
[0019] Figure 2 FIG. 4 is a circuit diagram of an anti-backfeed circuit of a power module according to another embodiment of the present invention. DETAILED DESCRIPTION
[0020] The embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0021] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.
[0022] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.
[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0024] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.
[0025] The present application embodiment provides a backflow prevention circuit for a power module. Figure 1 to Figure 2 Describe in detail.
[0026] In one embodiment, the anti-backflow circuit of the power module includes a power unit and an anti-backflow control unit, wherein the power unit includes an input filter voltage stabilization circuit, a low-voltage switch tube Q1, a high-voltage switch tube Q2, a drive power supply V cc, a driving diode D1, a driving capacitor C1, a first driving voltage regulator ZD1 and an output filter voltage regulator circuit, one end of the input filter voltage regulator circuit is connected to the S end of the low-voltage switch tube Q1 and the driving power supply V of the switch tube cc The negative end of the input filter voltage stabilizing circuit is connected to the power ground; the D pole of the low voltage switch tube Q1 is respectively connected to the S pole of the high voltage switch tube Q2, one end of the driving capacitor C1 and the anode of the first driving voltage stabilizing tube ZD1, the D pole of the high voltage switch tube Q2 is connected to one end of the output filter voltage stabilizing circuit, and the driving power supply V cc The positive end is connected to the anode of the driving diode D1, and the cathode of the driving diode D1 is respectively connected to the other end of the driving capacitor C1, the cathode of the first driving voltage regulator ZD1, and the G pole of the high-voltage switch tube Q2; the other end of the output filtering voltage regulator circuit is connected to the power ground; the anti-backfeed control unit is connected to the low-voltage switch tube Q1.
[0027] Specifically, the anti-backflow control unit is configured as an Or i ng control chip U1, and the Or i ng control chip U1 includes V g Pin, V s pin and V D pin, the V g The pin is connected to the G pole of the low voltage switch tube Q1, and the V s The pin is connected to the S pole of the low voltage switch tube Q1, and the V D The pin is connected to the D pole of the low voltage switch tube Q1.
[0028] In specific implementation, in the anti-backflow circuit of the power module of the present application, the Or i ng control chip U1 is the Or ing controller, which is an intelligent management component that can dynamically monitor the current flow of the power system and take corresponding measures when an abnormality is detected. The two switching tubes, the low-voltage switch tube Q1 and the high-voltage switch tube Q2, play a key role in the circuit, replacing the diodes in the traditional circuit to control the flow of current. This replacement effectively reduces the loss of the circuit in the on state and improves efficiency, especially in high-voltage applications, which is more efficient than the traditional diode solution. Driving power supply V cc Provide the necessary driving voltage for the high-voltage switch tube Q2 to ensure its correct operation; the driving diode D1 is used to protect the circuit from the influence of reverse current and provide a path for the driving signal of the high-voltage switch tube Q2; the driving capacitor C1 is used to assist in smoothing the driving signal to ensure the stable operation of the high-voltage switch tube Q2; the driving voltage regulator ZD1 is used to limit the driving voltage to protect the high-voltage switch tube Q2 from being affected by excessive voltage; the input filter voltage regulator circuit is used to filter and smooth the input voltage to reduce the influence of voltage fluctuations on the circuit, which can be set to the input capacitor Cin The output filter voltage regulator circuit is used to filter and smooth the output voltage to ensure the stability of the load side voltage. It can be set to the output capacitor C out .
[0029] Under normal working conditions, the driving power supply V cc The high-voltage switch Q2 is driven by the driving diode D1, the driving capacitor C1, and the driving voltage regulator ZD1. The current passes through the low-voltage switch Q1 and the high-voltage switch Q2 in the power part. When the circuit has reverse current, the current will flow through the high-voltage switch Q2 and the low-voltage switch Q1 to the input capacitor C of the anti-reverse current circuit. in At this time, the Or i ng control chip U1 detects the reverse current and turns off the low-voltage switch tube Q1. As the low-voltage switch tube Q1 is turned off, the voltage across its DS begins to rise. At the same time, the reverse current flows through the drive capacitor C1, discharging it until it reaches the forward conduction voltage of the drive voltage regulator tube ZD1, and the high-voltage switch tube Q2 is turned off. This achieves the function of preventing reverse current.
[0030] Furthermore, the anti-backflow circuit of the power module also includes a voltage stabilization protection circuit, one end of the voltage stabilization protection circuit is connected to one end of the input filter voltage stabilization circuit, and the other end of the voltage stabilization protection circuit is connected to one end of the output filter voltage stabilization circuit.
[0031] In this embodiment, the anti-backflow circuit of the power module includes a power unit, an anti-backflow control unit and a voltage stabilizing protection circuit, and the voltage stabilizing protection circuit is used to ensure that the voltage in the circuit is within a safe range during the entire operation process. When the backflow current occurs, the voltage stabilizing protection circuit will limit the voltage across the low-voltage switch tube Q1 to a safe level to prevent excessive voltage from damaging the components.
[0032] The working principle of the anti-backflow circuit of the power module of this embodiment is as follows: Under normal working conditions, the driving power supply V cc The high-voltage switch Q2 is driven by the driving diode D1, the driving capacitor C1, and the driving voltage regulator ZD1. The current passes through the low-voltage switch Q1 and the high-voltage switch Q2 in the power part. In this state, the voltage regulator protection circuit does not participate in the operation of the circuit. When the circuit has a reverse current, the current will flow through the high-voltage switch Q2 and the low-voltage switch Q1 to the input capacitor C of the anti-reverse current circuit. inAt this time, the Or i ng control chip U1 detects the reverse current and turns off the low-voltage switch tube Q1. As the low-voltage switch tube Q1 is turned off, the voltage across its DS begins to rise. At the same time, the reverse current flows through the driving capacitor C1, discharging it until it reaches the forward conduction voltage of the driving voltage regulator tube ZD1, and the high-voltage switch tube Q2 is turned off. Subsequently, the reverse current flows through the voltage regulator protection circuit, limiting the voltage across the DS of the low-voltage switch tube Q1 to below the safe voltage. This circuit ensures the safe and reliable operation of the low-voltage switch tube Q1.
[0033] Therefore, the circuit of this embodiment includes a power part, an anti-backflow control unit and a voltage stabilizing protection circuit. Under normal working conditions, the current passes through the field effect tube of the power part. This design replaces the traditional diode and effectively reduces the loss of the circuit in the on state. When the backflow current is detected, the anti-backflow control circuit turns off the field effect tube to prevent the current from flowing in the opposite direction. In addition, the voltage between the drain and source of the field effect tube is maintained within a safe range by the voltage stabilizing protection circuit to ensure the stability and safety of the circuit. At the same time, a safe discharge circuit is provided for the backflow current.
[0034] In one embodiment, referring to Figure 2 The voltage stabilizing protection circuit includes a second driving voltage stabilizing tube ZD2, the anode of the second driving voltage stabilizing tube ZD2 is connected to one end of the input filter voltage stabilizing circuit, and the cathode of the second driving voltage stabilizing tube ZD2 is connected to one end of the output filter voltage stabilizing circuit. Specifically, the input filter voltage stabilizing circuit is an input capacitor C in , the output filter voltage regulator circuit is the output capacitor C out .
[0035] In this embodiment, when a reverse current appears in the circuit, the current will flow through the high-voltage switch tube Q2 and the low-voltage switch tube Q1 to the input capacitor C of the anti-reverse current circuit. in . At this time, the Or i ng control chip U1 detects the reverse current and turns off the low-voltage switch tube Q1. As the low-voltage switch tube Q1 is turned off, the voltage across its DS begins to rise. At the same time, the reverse current flows through the driving capacitor C1, discharging it until it reaches the forward conduction voltage of the driving voltage regulator tube ZD1, and the high-voltage switch tube Q2 is turned off. Subsequently, the reverse current flows through the voltage regulator tube ZD2, limiting the voltage across the DS of the low-voltage switch tube Q1 to below the stable voltage of ZD2. This circuit ensures the safe and reliable operation of the low-voltage switch tube Q1, prevents possible damage caused by excessive voltage, and provides a safe discharge circuit for the reverse current.
[0036] The embodiment provided by the present invention has a number of significant advantages. First, it can adapt to different output voltage occasions, including high-voltage application scenarios, which greatly expands its application range. Second, compared with the traditional anti-backflow circuit, the technical solution significantly reduces the power loss in the on state. This loss reduction effect directly improves the overall efficiency of the power supply, which is crucial to the performance of the power supply.
[0037] In addition, the implementation of this technical solution is simple and reliable, and can be easily integrated into an existing power supply system, providing users with an efficient and economical solution.
[0038] The technical solution of the present invention is not limited to the above-mentioned embodiments, and any technical solution obtained by equivalent replacement method falls within the scope of protection required by the present invention. Optionally, the voltage regulator protection circuit can also be implemented by other analog circuits, and its implementation method is the same as the above-mentioned implementation method.
[0039] The technical solution of the present invention is not limited to the aforementioned embodiments. Those skilled in the art can achieve the same or similar technical effects by adopting equivalent replacement or equivalent transformation based on the core principles and concepts of the present invention. Therefore, all technical solutions obtained by using equivalent technical means should be deemed to fall within the scope of protection claimed by the present invention.
[0040] In addition, the implementation of the voltage stabilizing protection circuit is not limited to the specific circuit described above. Those skilled in the art can select other types of analog circuits to implement voltage stabilizing protection and current discharge functions according to actual application requirements, and the implementation method is the same as the above method in technical principle. This flexibility provides a wider range of application space for the present invention, allowing appropriate adjustment and optimization according to different application scenarios and technical requirements.
Claims
1. A backflow prevention circuit for a power module, characterized in that: The anti-backflow circuit of the power module includes a power unit and an anti-backflow control unit. The power unit includes an input filter voltage stabilization circuit, a low-voltage switch tube Q1, a high-voltage switch tube Q2, a drive power supply V cc , a driving diode D1, a driving capacitor C1, a first driving voltage regulator ZD1 and an output filter voltage regulator circuit, one end of the input filter voltage regulator circuit is connected to the S end of the low-voltage switch tube Q1 and the driving power supply V of the switch tube cc The negative end of the input filter voltage stabilizing circuit is connected to the power ground; the D pole of the low voltage switch tube Q1 is respectively connected to the S pole of the high voltage switch tube Q2, one end of the driving capacitor C1 and the anode of the first driving voltage stabilizing tube ZD1, the D pole of the high voltage switch tube Q2 is connected to one end of the output filter voltage stabilizing circuit, and the driving power supply V cc The positive end is connected to the anode of the driving diode D1, and the cathode of the driving diode D1 is respectively connected to the other end of the driving capacitor C1, the cathode of the first driving voltage regulator ZD1, and the G pole of the high-voltage switch tube Q2; the other end of the output filtering voltage regulator circuit is connected to the power ground; the anti-backfeed control unit is connected to the low-voltage switch tube Q1.
2. The anti-backflow circuit of the power module according to claim 1, characterized in that: The anti-backflow control unit is configured as an Oring control chip.
3. The anti-backflow circuit of the power module according to claim 2, characterized in that: The Oring control chip includes V g Pin, V s pin and V D pin, the V g The pin is connected to the G pole of the low voltage switch tube Q1, and the V s The pin is connected to the S pole of the low voltage switch tube Q1, and the V D The pin is connected to the D pole of the low voltage switch tube Q1.
4. The anti-backflow circuit of the power module according to claim 1, characterized in that: The anti-backflow circuit of the power module also includes a voltage stabilizing protection circuit, one end of the voltage stabilizing protection circuit is connected to one end of the input filtering voltage stabilizing circuit, and the other end of the voltage stabilizing protection circuit is connected to one end of the output filtering voltage stabilizing circuit.
5. The anti-backflow circuit of the power module according to claim 4, characterized in that: The voltage stabilizing protection circuit includes a second driving voltage stabilizing tube ZD2, wherein the anode of the second driving voltage stabilizing tube ZD2 is connected to one end of the input filtering voltage stabilizing circuit, and the cathode of the second driving voltage stabilizing tube ZD2 is connected to one end of the output filtering voltage stabilizing circuit.
6. The anti-backflow circuit of the power module according to claim 1, characterized in that: The input filter voltage stabilization circuit is set to input capacitor C in .
7. The anti-backflow circuit of the power module according to claim 1, characterized in that: The output filter voltage stabilization circuit is set to output capacitor C out .