A power-off maintenance module with short-circuit protection function
By introducing short-circuit protection circuits and related components into the power-down maintenance module, real-time detection and cutting off of short circuits at the output end is solved, and the existing modules lack short-circuit protection is ensured, ensuring the safety and stability of the system.
Patent Information
- Application Number
- CN202421311180.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-07
AI Technical Summary
The existing power-down maintenance module lacks short-circuit protection function, which causes the bus power supply voltage to drop when the power supply of the later-stage equipment is short-circuited, which may damage the power-down maintenance module or the pre-stage power supply equipment.
A power-down maintenance module with short-circuit protection function is designed, and components such as electronic switches, voltage comparison circuits, step-up and buck conversion circuits and short-circuit protection circuits are used to realize real-time detection and cutting of short circuits at the output end to prevent the failure from expanding.
It effectively prevents circuit damage during short circuit of output, ensures that the system can still work normally under short circuit situations, and avoids the drop in bus voltage.
Smart Images
Figure CN222706242U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of airborne electronic equipment, in particular to a power-off maintenance module with a short-circuit protection function. Background Art
[0002] In order to meet reliability requirements, many airborne devices usually require the power supply system to have a power-off retention function, so that when the bus power fails, the system can maintain power supply for a period of time to perform necessary data processing and storage operations, or ensure that the system can work normally when the power is interrupted momentarily.
[0003] The power-off maintenance module is connected between the bus power supply and the power supply of the power supply equipment, and realizes the above functions by storing energy through an external large-capacity capacitor. When the bus voltage is normal, the input and output of the power-off maintenance module are in a straight-through state. Conventional power-off maintenance modules do not have short-circuit protection functions. Once a short circuit occurs in the power supply of the subsequent equipment, the bus power supply voltage will be lowered through the power-off maintenance module, affecting the bus voltage, and even burning the power-off maintenance module or the previous power supply equipment. Utility Model Content
[0004] The purpose of the utility model is to solve the technical problems existing in the background technology. To this end, a power-off maintenance module with a short-circuit protection function is provided. While satisfying the basic power-off maintenance function, the short-circuit protection function is added; when a short-circuit fault occurs at the output end of the power-off maintenance module, the power supply is cut off in time to avoid further expansion of the fault.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] A power-off maintenance module with a short-circuit protection function comprises an input positive electrode, an electronic switch 1, an electronic switch 2, a voltage comparison circuit, a step-up / step-down conversion circuit, a short-circuit protection circuit and an output positive electrode;
[0007] The input positive electrode is electrically connected to the input end of the short-circuit protection circuit through an electronic switch 1, and the output end of the short-circuit protection circuit is electrically connected to the output positive electrode;
[0008] The input positive electrode is electrically connected to the input end of the buck-boost converter circuit through an electronic switch 1, the output end of the buck-boost converter circuit is electrically connected to the positive electrode of the external energy storage capacitor, and the negative electrode of the external energy storage capacitor is grounded;
[0009] The positive electrode of the external energy storage capacitor is electrically connected to the input end of the short-circuit protection circuit through the second electronic switch;
[0010] The input positive electrode is electrically connected to the input end of the voltage comparison circuit, and the output end of the voltage comparison circuit is electrically connected to the electronic switch 1, the electronic switch 2 and the step-up / step-down conversion circuit respectively.
[0011] The following is a technical solution further defined by the present utility model, wherein the short-circuit protection circuit includes an input terminal Vin, an output terminal Vo, a capacitor C2, resistors R2, R3, R4, and MOS tubes Q1 and Q2;
[0012] The input terminal Vin, the capacitor C2, the resistors R3 and R4 are electrically connected in sequence, and the other end of the resistor R4 is grounded. The gate of the MOS transistor Q2 is electrically connected to the line between the resistors R3 and R4. The source of the MOS transistor Q2 is grounded. The drain of the MOS transistor Q2 is electrically connected to the gate of the MOS transistor Q1 through the resistor R2.
[0013] The source of the MOS transistor Q1 is electrically connected to the input terminal Vin, and the drain of the MOS transistor Q1 is electrically connected to the output terminal Vo.
[0014] The following is a technical solution further defined by the present invention: a diode D3 and a resistor R5 are electrically connected between the output terminal Vo and the gate of the MOS tube Q2, wherein the anode of the diode D3 is electrically connected to the output terminal Vo, and the cathode of the diode D3 is electrically connected to the gate of the MOS tube Q2 through the resistor R5.
[0015] The following is a technical solution further defined by the present invention: a voltage stabilizing diode D2 is electrically connected between the gate and source of the MOS tube Q2, and a voltage stabilizing diode D1 and a resistor R1 are electrically connected between the gate and source of the MOS tube Q2, wherein the voltage stabilizing diode D1 and the resistor R1 are connected in parallel.
[0016] Compared with the prior art, the utility model has the following technical effects:
[0017] The utility model realizes power-off retention of the circuit, meets the application of the full range of input voltage of 16V to 40V, and does not require a transformer; in addition, a short-circuit protection function is added to prevent circuit damage when the output is short-circuited.
[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 This is a simplified diagram of the overall structural connection relationship of the utility model;
[0021] Figure 2 It is a circuit connection relationship diagram of the short-circuit protection circuit in the utility model. DETAILED DESCRIPTION
[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0023] like Figure 1 As shown, a power-off maintenance module with a short-circuit protection function is provided, including an input positive electrode, an electronic switch 1, an electronic switch 2, a voltage comparison circuit, a buck-boost conversion circuit, a short-circuit protection circuit and an output positive electrode.
[0024] The input positive electrode is electrically connected to the input end of the short-circuit protection circuit through the electronic switch 1, and the output end of the short-circuit protection circuit is electrically connected to the output positive electrode.
[0025] The input positive electrode is electrically connected to the input end of the buck-boost converter circuit through an electronic switch 1, the output end of the buck-boost converter circuit is electrically connected to the positive electrode of the external energy storage capacitor, and the negative electrode of the external energy storage capacitor is grounded.
[0026] The positive electrode of the external energy storage capacitor is electrically connected to the input end of the short-circuit protection circuit through the second electronic switch.
[0027] The input positive electrode is electrically connected to the input end of the voltage comparison circuit, and the output end of the voltage comparison circuit is electrically connected to the electronic switch 1, the electronic switch 2 and the step-up / step-down conversion circuit respectively.
[0028] Therefore, when the input voltage of the input positive electrode is normal, the voltage comparison circuit generates a control signal to turn on the electronic switch 1, and the input voltage is output from the output positive electrode through the electronic switch 1 and the short-circuit protection circuit to supply power to the subsequent stage; at the same time, the electronic switch 2 is turned off, and the step-up and step-down conversion circuit works to charge the external energy storage capacitor C1.
[0029] When the input voltage of the positive input electrode drops outside the normal range, the voltage comparison circuit generates a control signal to turn off the electronic switch 1 and stop the buck-boost conversion circuit from working; at the same time, the electronic switch 2 is turned on, and the energy stored in the external energy storage capacitor C1 is supplied to the subsequent stage through the electronic switch 2 and the short-circuit protection circuit.
[0030] It should be noted that, in the present utility model, the specific circuits of the voltage comparison circuit and the buck-boost conversion circuit themselves are not within the protection scope of the present utility model, and the voltage comparison circuit and the buck-boost conversion circuit are prior arts, which are only used for technical personnel in this field to understand the application of the voltage comparison circuit and the buck-boost conversion circuit. Therefore, this embodiment does not describe in detail the specific circuits of the voltage comparison circuit and the buck-boost conversion circuit themselves.
[0031] It should be noted that in the present utility model, the process algorithms and programs designed by the voltage comparison circuit in the process of controlling the operation of electronic switch 1, electronic switch 2 and buck-boost conversion circuit are not within the protection scope of the present utility model, and the process algorithms and programs involved can be obtained by technicians in this field through conventional techniques, and are only used for technicians in this field to understand the control application of the voltage comparison circuit.
[0032] like Figure 2 As shown, the short-circuit protection circuit includes an input terminal Vin, an output terminal Vo, a capacitor C2, resistors R1, R2, R3, R4, R5, MOS transistors Q1, Q2, a diode D3, and voltage-stabilizing diodes D1, D2. Among them, the MOS transistor Q1 is a P-channel MOS transistor, i.e., a PMOS transistor; and the MOS transistor Q2 is an N-channel MOS transistor, i.e., an NMOS transistor.
[0033] The input terminal Vin, the capacitor C2, the resistors R3 and R4 are electrically connected in sequence, and the other end of the resistor R4 is grounded. The gate of the MOS transistor Q2 is electrically connected to the line between the resistors R3 and R4. The source of the MOS transistor Q2 is grounded. The drain of the MOS transistor Q2 is electrically connected to the gate of the MOS transistor Q1 through the resistor R2.
[0034] The source of the MOS transistor Q1 is electrically connected to the input terminal Vin, and the drain of the MOS transistor Q1 is electrically connected to the output terminal Vo.
[0035] A diode D3 and a resistor R5 are electrically connected between the output terminal Vo and the gate of the MOS transistor Q2 , wherein the anode of the diode D3 is electrically connected to the output terminal Vo, and the cathode of the diode D3 is electrically connected to the gate of the MOS transistor Q2 through the resistor R5 .
[0036] A voltage zener diode D2 is electrically connected between the gate and source of the MOS transistor Q2 , and a voltage zener diode D1 and a resistor R1 are electrically connected between the gate and source of the MOS transistor Q2 , wherein the voltage zener diode D1 and the resistor R1 are connected in parallel.
[0037] In the short-circuit protection circuit, at the moment when the input terminal Vin is powered on, since the voltage across the capacitor C2 cannot change suddenly, the current flows through the capacitor C2, generates a voltage on the resistor R4, and provides a turn-on voltage to the gate of the MOS tube Q2, Q2 is turned on, so that the gate of the MOS tube Q1 is at a low level, Q1 is turned on, and the power supply is supplied to the subsequent stage; after Q1 is turned on, the output terminal Vo provides a gate voltage to Q2 through the diode D3 and the resistor R5 to keep Q1 turned on.
[0038] When a short circuit occurs at the output terminal Vo, Vo is short-circuited, Q2 is turned off due to no gate voltage, the gate voltage of Q1 is the same as the input voltage, Q1 is turned off, and the circuit has no output, thus realizing the output short-circuit protection function.
[0039] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the utility model without departing from the content of the technical solution of the utility model should be included in the protection scope of the utility model.
Claims
1. A power-off maintenance module with short-circuit protection function, characterized in that: It includes an input positive electrode, an electronic switch 1, an electronic switch 2, a voltage comparison circuit, a step-up / step-down conversion circuit, a short-circuit protection circuit and an output positive electrode; The input positive electrode is electrically connected to the input end of the short-circuit protection circuit through an electronic switch 1, and the output end of the short-circuit protection circuit is electrically connected to the output positive electrode; The input positive electrode is electrically connected to the input end of the buck-boost converter circuit through an electronic switch 1, the output end of the buck-boost converter circuit is electrically connected to the positive electrode of the external energy storage capacitor, and the negative electrode of the external energy storage capacitor is grounded; The positive electrode of the external energy storage capacitor is electrically connected to the input end of the short-circuit protection circuit through the second electronic switch; The input positive electrode is electrically connected to the input end of the voltage comparison circuit, and the output end of the voltage comparison circuit is electrically connected to the electronic switch 1, the electronic switch 2 and the step-up / step-down conversion circuit respectively.
2. A power-off maintenance module with short-circuit protection function as claimed in claim 1, characterized in that: The short circuit protection circuit includes an input terminal Vin, an output terminal Vo, a capacitor C2, resistors R2, R3, R4, and MOS tubes Q1 and Q2; The input terminal Vin, the capacitor C2, the resistors R3 and R4 are electrically connected in sequence, and the other end of the resistor R4 is grounded. The gate of the MOS transistor Q2 is electrically connected to the line between the resistors R3 and R4. The source of the MOS transistor Q2 is grounded. The drain of the MOS transistor Q2 is electrically connected to the gate of the MOS transistor Q1 through the resistor R2. The source of the MOS transistor Q1 is electrically connected to the input terminal Vin, and the drain of the MOS transistor Q1 is electrically connected to the output terminal Vo.
3. A power-off maintenance module with short-circuit protection function as claimed in claim 2, characterized in that: A diode D3 and a resistor R5 are electrically connected between the output terminal Vo and the gate of the MOS transistor Q2 , wherein the anode of the diode D3 is electrically connected to the output terminal Vo, and the cathode of the diode D3 is electrically connected to the gate of the MOS transistor Q2 through the resistor R5 .
4. A power-off maintenance module with short-circuit protection function as claimed in claim 3, characterized in that: A voltage stabilizing diode D2 is electrically connected between the gate and source of the MOS transistor Q2 , and a voltage stabilizing diode D1 and a resistor R1 are electrically connected between the gate and source of the MOS transistor Q2 , wherein the voltage stabilizing diode D1 and the resistor R1 are connected in parallel.