Airborne equipment power supply anti-reverse protection circuit

Abstract

The utility model discloses an airborne equipment power supply anti-reverse protection circuit. The airborne equipment power supply anti-reverse protection circuit comprises a processor module, a driving isolation module, switch modules, power supply modules and a subsequent circuit module, the number of the power supply modules is not less than two, and the switch modules and the power supply modules are in one-to-one correspondence. The switch module is arranged between the corresponding power supply module and the subsequent circuit module, and the processor module controls the switch module through the driving isolation module. The switching module has at least one switching branch. And the switch branch comprises a metal oxide semiconductor field effect transistor (MOSFET). The beneficial effects of the utility model lie in that the MOSFET is used to replace a diode to serve as a switch for anti-reverse protection of the airborne equipment power supply, and energy consumption loss of large current caused by voltage drop of the diode can be avoided.

Description

Technical Field

[0001] The utility model relates to an anti-reverse protection circuit for an airborne equipment power supply, in particular to an anti-reverse protection circuit for an airborne equipment power supply. Background Art

[0002] Based on safety redundancy, the airborne equipment has more than two power modules. In order to prevent the current of the working power module from flowing back to the non-working power module, a forward diode is configured in front of each power module to provide reverse protection. The disadvantage of the above technical solution is that some circuits have a large current, up to several hundred amperes, and the diode usually has a voltage drop of about 0.7V, which will cause a lot of power consumption. At the same time, the electrical energy is converted into heat energy on the diode, and additional heat dissipation design is required. Taking the rated current of a certain model of secondary power distribution system of 250A as an example, the diode generates at least 150W of heat loss. Utility Model Content

[0003] The utility model aims to solve the technical problem that airborne equipment uses diodes as power supply reverse protection in the prior art, and to provide a novel airborne equipment power supply reverse protection circuit.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a technical solution: an airborne equipment power supply anti-reverse protection circuit, comprising: a processor module, a drive isolation module, a switch module, a power module and a subsequent circuit module. The number of the power modules is not less than two, and the switch module and the power module are in a one-to-one correspondence. The switch module is between the corresponding power module and the subsequent circuit module. The processor module controls the switch module through the drive isolation module. The switch module has at least two switch branches. Each of the switch branches of the switch module includes: a MOSFET tube. Among them, the source of the MOSFET tube serves as the input end of the switch module, the drain of the MOSFET tube serves as the output end of the switch module, and the gate of the MOSFET tube serves as the control end of the switch module.

[0005] As a preferred solution of the airborne equipment power supply anti-reverse protection circuit, the MOSFET tubes of each switch branch of the switch module share the same driving signal.

[0006] As a preferred solution for the airborne equipment power supply anti-reverse protection circuit, a voltage regulator tube is provided between the source and the gate of the MOSFET tube of each switch branch of the switch module.

[0007] As a preferred solution for the airborne equipment power supply anti-reverse protection circuit, the lines of the MOSFET tubes from the drive isolation module to each switch branch of the switch module on the PCB are arranged to be of equal length.

[0008] Compared with the prior art, the beneficial effect of the utility model is at least that: using MOSFET tubes instead of diodes as switches for anti-reverse protection of airborne equipment power supply can avoid energy loss caused by the voltage drop of diodes due to large currents. Tests have shown that the loss of MOSFET tube solutions can be controlled within 10% of the diode solution, and the heat is greatly reduced, and no heat dissipation design is required, which improves the weight, life, reliability, safety, etc. of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of an anti-reverse protection circuit for an airborne device power supply according to an embodiment of the utility model. DETAILED DESCRIPTION

[0010] The present invention is further described in detail below through specific implementations in combination with the accompanying drawings. It should be noted that the description of these implementations is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0011] See also Figure 1 , the figure shows an airborne equipment power supply anti-reverse protection circuit, which can be used in load power supply occasions such as aerospace and other fields to meet different usage requirements.

[0012] The airborne equipment power supply anti-reverse protection circuit includes: a processor module, a drive isolation module, a switch module 1, a power module 1, a switch module 2, a power module 2 and a subsequent circuit module. The processor module is connected to the switch module 1 and the switch module 2 respectively through the drive isolation module. The switch module 1 is between the power module 1 and the subsequent circuit module. The switch module 2 is between the power module 2 and the subsequent circuit module. The processor module is used to control one of the switch module 1 and the switch module 2 to be turned on and the other to be turned off.

[0013] The switch module 1 has at least two switch branches 1. Each switch branch 1 of the switch module 1 includes: a MOSFET tube. The source of the MOSFET tube serves as the input end of the switch module 1. The source of the MOSFET tube is connected to the power module 1. The drain of the MOSFET tube serves as the output end of the switch module 1. The gate of the MOSFET tube serves as the control end of the switch module 1. The gate of the MOSFET tube is connected to the drive isolation module. If the drive signal received by the MOSFET tube is a conduction signal, the MOSFET tube is turned on, and the power module 1 supplies power to the subsequent circuit module through the MOSFET tube. If the drive signal received by the MOSFET tube is a disconnection signal, the MOSFET tube is disconnected, and the MOSFET tube blocks the power module 1 from the subsequent circuit module.

[0014] Preferably, the MOSFET tubes of each switch branch of the switch module share the same driving signal.

[0015] Preferably, in each of the switch branches of the switch module, there is a voltage regulator tube between the source and the gate of the MOSFET tube. The purpose of configuring the voltage regulator tube is to protect the MOSFET tube from being damaged by instantaneous high voltage. In specific implementation, the stable voltage of the voltage regulator tube is 15V, there is a resistor between the driving signal received by the MOSFET tube and the gate of the MOSFET tube, the resistance of the resistor is 10KΩ, and the connection time between the source and the drain of the MOSFET tube is about 0.1ms, which reduces the generation of high-frequency signals and is beneficial to electromagnetic compatibility performance.

[0016] Preferably, the lines from the drive isolation module to the MOSFET tubes of each switch branch of the switch module on the PCB are arranged to be of equal length, in order to balance the line impedance of each parallel-connected MOSFET tube.

[0017] The switch module 2 has at least two switch branches 2. Each switch branch 2 of the switch module 2 includes: a MOSFET tube. The source of the MOSFET tube serves as the input end of the switch module 2. The source of the MOSFET tube is connected to the power module 2. The drain of the MOSFET tube serves as the output end of the switch module 2. The gate of the MOSFET tube serves as the control end of the switch module 2. The gate of the MOSFET tube is connected to the drive isolation module. If the drive signal received by the MOSFET tube is a conduction signal, the MOSFET tube is turned on, and the power module 2 supplies power to the subsequent circuit module through the MOSFET tube. If the drive signal received by the MOSFET tube is a disconnection signal, the MOSFET tube is disconnected, and the MOSFET tube blocks the power module 2 from the subsequent circuit module.

[0018] Preferably, the MOSFET tubes of each switch branch 2 of the switch module 2 share the same driving signal.

[0019] Preferably, in each of the switch branches of the switch module 2, there is a voltage regulator tube between the source and the gate of the MOSFET tube. The purpose of configuring the voltage regulator tube is to protect the MOSFET tube from being damaged by instantaneous high voltage. In specific implementation, the stable voltage of the voltage regulator tube is 15V, there is a resistor between the driving signal received by the MOSFET tube and the gate of the MOSFET tube, the resistance of the resistor is 10KΩ, and the connection time between the source and the drain of the MOSFET tube is about 0.1ms, which reduces the generation of high-frequency signals and is beneficial to electromagnetic compatibility performance.

[0020] Preferably, the lines from the drive isolation module to the MOSFET tubes of each switch branch of the switch module 2 on the PCB are arranged to be of equal length, in order to balance the line impedance of each parallel-connected MOSFET tube.

[0021] In specific implementation, the airborne equipment power supply anti-reverse protection circuit further includes: a voltage acquisition module 1 and a voltage acquisition module 2. The input end of the voltage acquisition module 1 is connected to the power module 1. The output end of the voltage acquisition module 1 is connected to the processor module. The voltage acquisition module 1 is used to acquire the power supply voltage of the power module 1 and send the acquired power supply voltage of the power module 1 to the processor module. The input end of the voltage acquisition module 2 is connected to the power module 2. The output end of the voltage acquisition module 2 is connected to the processor module. The voltage acquisition module 2 is used to acquire the power supply voltage of the power module 2 and send the acquired power supply voltage of the power module 2 to the processor module. The processor module is used to determine the power supply voltage of the power module 1 and the power module 2, which has the highest power supply voltage, and set the drive signal of the switch module corresponding to the highest power supply voltage to the on signal and set the drive signals of the switch modules corresponding to the others to the off signal.

[0022] Take the power module 1 as the highest one as an example. The processor module sets the drive signal of the switch module 1 to the on signal and sets the drive signal of the switch module 2 to the off signal. After the switch module 1 receives the on signal, the MOSFET tubes of each switch branch of the switch module 1 are all on, and the power module 1 supplies power to the subsequent circuit module. After the switch module 2 receives the off signal, the MOSFET tubes of each switch branch of the switch module 2 are all off, and the power module 2 enters the waiting state. At the same time, since the MOSFET tubes of each switch branch of the switch module 2 have body diodes inside, the body diodes block the DC current of the power module 1 from entering the power module 2, thereby protecting the power module 2.

[0023] In other embodiments, the airborne equipment power anti-reverse protection circuit further includes: power module three, switch module three and other more power modules and switch modules.

[0024] The above only expresses the implementation mode of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An airborne equipment power supply anti-reverse protection circuit, comprising: A processor module, a drive isolation module, a switch module, a power supply module and a subsequent circuit module, wherein the number of the power supply modules is not less than two, the switch module and the power supply module are in a one-to-one correspondence, the switch module is between the corresponding power supply module and the subsequent circuit module, the processor module controls the switch module through the drive isolation module, and is characterized in that the switch module has at least one switch branch, and the switch branch includes: a MOSFET tube, wherein the source of the MOSFET tube serves as the input end of the switch module, the drain of the MOSFET tube serves as the output end of the switch module, and the gate of the MOSFET tube serves as the control end of the switch module.

2. The airborne equipment power supply anti-reverse protection circuit according to claim 1, characterized in that: The MOSFET tubes of each switch branch of the switch module share the same driving signal.

3. The airborne equipment power supply anti-reverse protection circuit according to claim 1, characterized in that: A voltage regulator tube is provided between the source and the gate of the MOSFET tube of each switch branch of the switch module.

4. The airborne equipment power supply anti-reverse protection circuit according to claim 1, characterized in that: The lines from the driving isolation module to the MOSFET tubes of each switch branch of the switch module on the PCB are arranged to be of equal length.

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