Low-cost current surge suppression circuit based on MOS tube

Abstract

The invention relates to a low-cost current surge suppression circuit based on an MOS tube, and belongs to the technical field of aviation electrical. The circuit comprises a voltage stabilizing module, a starting control module, an electronic switch module and an anti-reverse-connection module. According to the scheme, the circuit is built by selecting common devices, the function of suppressing surge current is achieved, adjustment of slow start time can be achieved by adjusting design parameters, the influence of the surge current on airborne equipment and an input power supply is reduced, a protection circuit is designed, and the reliability of the circuit is improved. The whole circuit design has universality, is simple and reliable, and has typical popularization value.

Description

Technical Field

[0001] The invention belongs to the field of aviation electrical technology, and in particular relates to a low-cost current surge suppression circuit based on MOS tubes. Background Art

[0002] In order to protect the input voltage, the airborne equipment is equipped with a large-capacitance voltage-stabilizing capacitor. At the initial moment of power-on, the capacitor will be charged due to its existence, forming a large charging current. The existence of this current may cause an impact on the input power supply and bring other unpredictable effects to the airborne equipment. Therefore, it is necessary to add a suppression circuit to the circuit design of the airborne equipment to enable the airborne equipment to start slowly and minimize the impact of the surge current. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is: to add a suppression circuit in the circuit design of the airborne equipment so that the airborne equipment can achieve a slow start and reduce the impact of the surge current to a minimum.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides a low-cost current surge suppression circuit based on MOS tube, including an anti-reverse connection module, a voltage stabilizing module, a start-up control module and an electronic switch module; wherein the voltage stabilizing module is used to limit the voltage applied to the electronic switch module within a certain range to prevent damage to the electronic switch module; the start-up control module is the control part of the electronic switch module, which is used to control the on and off of the electronic switch; the electronic switch module is used to open and close the load circuit; the anti-reverse connection module is used to prevent a short circuit caused by reverse connection of the power line.

[0007] (III) Beneficial effects

[0008] The present invention provides a low-cost current surge suppression circuit based on MOS tube, including a voltage stabilization module, a startup control module, an electronic switch module and an anti-reverse connection module. The solution realizes the function of suppressing surge current by selecting common devices to build the circuit. The slow start time can be adjusted by adjusting the design parameters to reduce the impact of surge current on airborne equipment and input power supply, and a protection circuit is designed to improve the reliability of the circuit. The entire circuit design is universal, simple and reliable, and has typical promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention is a low-cost current surge suppression circuit based on a MOS tube applied to a certain startup controller. DETAILED DESCRIPTION

[0010] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0011] refer to Figure 1 The present invention provides a low-cost current surge suppression circuit based on a MOS tube, comprising an anti-reverse connection module, a voltage stabilizing module, a start-up control module and an electronic switch module; wherein the voltage stabilizing module is used to limit the voltage applied to the electronic switch module within a certain range to prevent damage to the electronic switch module; the start-up control module is the control part of the electronic switch module, which is used to control the on and off of the electronic switch; the electronic switch module is used to open and close the load circuit; the anti-reverse connection module is used to prevent a short circuit caused by reverse connection of the power line.

[0012] The anti-reverse connection module includes an ideal diode V1 and a TVS tube V2; wherein: V1 is an ideal diode, which realizes the anti-reverse connection function through its unidirectional conductive characteristics, the second pin of V1 is connected to the positive input terminal of the input power supply DC28V, and the first pin is connected to the negative input terminal of DC28V, V2 is a TVS tube, the first pin of V2 is connected to the third pin of V1, and the second pin of V2 is connected to the negative input terminal of DC28V.

[0013] The voltage stabilizing module includes a voltage stabilizing tube V3 and a resistor R2; wherein: V3 is a voltage stabilizing tube, and when the voltage across the two ends thereof exceeds its threshold value, the voltage can be clamped to prevent the voltage from exceeding the gate-source voltage upper limit of the MOS tube V4 in the rear-end electronic switch module and causing V4 to break down, the first foot of V3 is connected to the first foot of the capacitor C1 in the start-up control module, the second foot of V3 is connected to the negative end of the DC28V input, the first foot of R2 is connected to the first foot of C1, and the second foot of R2 is connected to the fourth foot of V4.

[0014] The startup control module includes resistors R1 and R3, and capacitor C1; wherein: the first foot of resistor R1 is connected to the first foot of V2 and the first foot of the load, the second foot of R1 is connected to the first foot of C1, the second foot of capacitor C1 is connected to the negative end of DC28V input, the first foot of R3 is connected to the first foot of C1, and the second foot of R3 is connected to the negative end of DC28V input; R1 and R3 form a slow startup time control module, and the startup time of the load can be controlled by adjusting the parameters of the two. In this embodiment, the load is a startup controller, which is a kind of airborne equipment.

[0015] The electronic switch module includes a MOS tube V4; wherein: when the gate-source voltage of V4 reaches the turn-on threshold, the MOS tube V4 is turned on; when the gate-source voltage of V4 is lower than the turn-on threshold, the MOS tube V4 remains in the off state; the first, second and third pins of V4 are all connected to the negative terminal of the DC28V input; the fifth pin of V4 is connected to the second pin of the load;

[0016] The suppression circuit also includes a current limiting module composed of resistors R4 and R5, wherein the first pin of the resistor R4 is connected to the negative end of the DC28V input, the second pin of R4 is connected to the second pin of the load, the first pin of the resistor R5 is connected to the negative end of the DC28V input, and the second pin of R5 is connected to the second pin of the load. After the DC28V is powered on, before the MOS tube V4 is turned on, current reflux is achieved through R4 and R5, and the resistance of the load loop is used to limit the magnitude of the conduction current of the MOS tube V4.

[0017] The on time of the MOS tube V4 is determined by the slow start time control module composed of the start control module R1 and R3. The on time of the MOS tube V4 is also the charging time of the capacitor C1. After the charging is completed, the voltage division of the resistors R1 and R3 provides the on voltage for the MOS tube V4. V2 is a protection measure to prevent excessive voltage.

[0018] It can be seen that the low-cost current surge suppression circuit based on MOS tube designed by the present invention realizes the function of suppressing surge current by selecting common devices to build the circuit, and can change the suppression time by adjusting the design parameters, so that the airborne equipment can achieve slow start and minimize the impact of surge current. The above design can greatly improve the anti-interference and reliability of the circuit. The circuit is built with common devices, has the advantages of low cost, high reliability, convenient parameter adjustment, etc., and has good application value.

[0019] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A low-cost current surge suppression circuit based on MOS tube, characterized in that: It includes an anti-reverse connection module, a voltage stabilizing module, a start-up control module and an electronic switch module; wherein the voltage stabilizing module is used to limit the voltage applied to the electronic switch module within a certain range to prevent damage to the electronic switch module; the start-up control module is the control part of the electronic switch module, which is used to control the on and off of the electronic switch; the electronic switch module is used to open and close the load circuit; the anti-reverse connection module is used to prevent a short circuit caused by reverse connection of the power line.

2. The circuit according to claim 1, characterized in that The anti-reverse connection module includes an ideal diode V1 and a TVS tube V2; wherein: V1 is an ideal diode, which realizes the anti-reverse connection function through its unidirectional conductive characteristics, the second pin of V1 is connected to the input positive terminal of the input power supply DC28V, and the first pin is connected to the DC28V input negative terminal, V2 is a TVS tube, the first pin of V2 is connected to the third pin of V1, and the second pin of V2 is connected to the DC28V input negative terminal.

3. The circuit according to claim 2, characterized in that The voltage stabilizing module includes a voltage stabilizing tube V3 and a resistor R2; wherein: V3 is a voltage stabilizing tube, and when the voltage across the two ends thereof exceeds its threshold value, the voltage can be clamped to prevent the voltage from exceeding the gate-source voltage upper limit of the MOS tube V4 in the rear-end electronic switch module and causing V4 to break down, the first foot of V3 is connected to the first foot of the capacitor C1 in the start-up control module, the second foot of V3 is connected to the negative end of the DC28V input, the first foot of R2 is connected to the first foot of C1, and the second foot of R2 is connected to the fourth foot of V4.

4. The circuit according to claim 3, characterized in that The startup control module includes resistors R1 and R3, and capacitor C1; wherein: the first pin of resistor R1 is connected to the first pin of V2 and the first pin of the load, the second pin of R1 is connected to the first pin of C1, the second pin of capacitor C1 is connected to the negative end of DC28V input, the first pin of R3 is connected to the first pin of C1, and the second pin of R3 is connected to the negative end of DC28V input; R1 and R3 form a slow start time control module, and the load startup time can be controlled by adjusting the parameters of the two.

5. The circuit according to claim 4, characterized in that The electronic switch module includes a MOS tube V4; wherein: when the gate-source voltage of V4 reaches the turn-on threshold, the MOS tube V4 is turned on, and when the gate-source voltage of V4 is lower than the turn-on threshold, the MOS tube V4 remains in the off state, the first pin, the second pin, and the third pin of V4 are all connected to the negative terminal of the DC28V input, and the fifth pin of V4 is connected to the second pin of the load.

6. The circuit according to claim 5, characterized in that The suppression circuit also includes a current limiting module composed of resistors R4 and R5, wherein the first pin of the resistor R4 is connected to the negative end of the DC28V input, the second pin of R4 is connected to the second pin of the load, the first pin of the resistor R5 is connected to the negative end of the DC28V input, and the second pin of R5 is connected to the second pin of the load; after the DC28V is powered on, before the MOS tube V4 is turned on, current reflux is achieved through R4 and R5, and the resistance of the load loop can limit the magnitude of the conduction current of the MOS tube V4.

7. The circuit according to any one of claims 1 to 6, characterized in that This circuit is used in the field of aviation electrical technology.

8. An airborne equipment circuit based on the circuit design according to any one of claims 1 to 7.

9. The circuit according to claim 8, characterized in that The load is a startup controller.

10. The circuit according to claim 8, characterized in that This circuit is used in the field of aviation electrical technology.

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