A protection circuit
By designing a protection circuit including interface circuit, reset circuit and logic control circuit, and using a four-channel differential comparator and D flip-flop to achieve timely response to overvoltage or overcurrent, the problem of slow operation time of existing protection circuits is solved and the stability and safety of the circuit are improved.
Patent Information
- Application Number
- CN202420388623.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-02-28
AI Technical Summary
When an existing protection circuit detects an overvoltage or overcurrent, the protection operation time is slow and the output cannot be turned off in time, affecting the stability of the circuit.
A protection circuit including an interface circuit, a reset circuit and a logic control circuit is designed. The input signal is collected through a four-channel differential comparator to compare it with the set target value. When the set value is exceeded, the output is controlled by the D flip-flop to be turned off in time.
Timely response and processing of overvoltage or overcurrent is achieved, ensuring the stability and safety of the circuit, and the protection operation time is faster than traditional methods.
Smart Images
Figure CN222721124U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of voltage and current protection, in particular to a protection circuit. Background Art
[0002] In view of the fact that there are some unstable factors in the power supply circuit, the circuit designed to prevent such unstable factors from affecting the circuit effect is called a protection circuit. For example, there are overcurrent protection, overvoltage protection, overheating protection, no-load protection, short circuit protection, etc. Now, the protection action is given by the overvoltage and overcurrent signals collected by the PLC, and the protection action time is not as fast as the comparator protection action.
[0003] In view of the above problems, the utility model provides a protection circuit which can shut down the output in time. Utility Model Content
[0004] The utility model provides a protection circuit which can cut off output in time.
[0005] The utility model aims to provide a protection circuit, comprising an interface circuit, a reset circuit and a logic control circuit, wherein the interface circuit is connected with the reset circuit, and the logic control circuit is connected with the interface circuit.
[0006] Furthermore, the logic control circuit includes a D flip-flop and four-way differential comparators, and the D flip-flop and the four-way differential comparators are connected.
[0007] Furthermore, the reset circuit includes a transistor, a diode and a resistor, and the transistor, the resistor and the diode are all connected in parallel in the reset circuit.
[0008] The utility model has the following advantages: the utility model collects numerical values through AI1, AI2, AI3 and AI4 inputs of four-way differential comparators, and sets a target value through REF input, and compares the collected numerical values with the set target values through the four-way differential comparators. When the collected values exceed the set target value, the control output is shut down. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is the circuit principle diagram of the utility model;
[0010] Figure 2 This is the interface circuit schematic diagram of the utility model;
[0011] Figure 3 This is a schematic diagram of the reset circuit of the utility model;
[0012] Figure 4 This is a schematic diagram of the logic control circuit of the utility model. DETAILED DESCRIPTION
[0013] The utility model provides a protection circuit, comprising an interface circuit, a reset circuit and a logic control circuit. The interface circuit is connected with the reset circuit, and the logic control circuit is connected with the interface circuit.
[0014] In this embodiment, the logic control circuit includes a D flip-flop and four differential comparators, and the D flip-flop and the four differential comparators are connected.
[0015] In this embodiment, the reset circuit includes a transistor, a diode and a resistor, and the transistor, the resistor and the diode are all connected in parallel in the reset circuit.
[0016] In this embodiment, the collected values are input through four differential comparators AI1, AI2, AI3 and AI4, and the set target value is input through REF. The collected values are compared with the set target value through the four differential comparators. When the collected values exceed the set target value, the control output is shut down.
[0017] In this embodiment, the initial state of the D flip-flop is fixed, and a clock is provided to the D flip-flop through four differential comparators.
[0018] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.
Claims
1. A protection circuit, comprising an interface circuit, a reset circuit and a logic control circuit, characterized in that: The interface circuit is connected to the reset circuit, the logic control circuit is connected to the interface circuit, the logic control circuit includes a D flip-flop and a four-way differential comparator, the D flip-flop is connected to the four-way differential comparator, the reset circuit includes a transistor, a diode and a resistor, and the transistor, the resistor and the diode are all connected in parallel in the reset circuit.