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CN-224233337-U - Multifunctional protection circuit for voltage source of relay protection tester and tester

CN224233337UCN 224233337 UCN224233337 UCN 224233337UCN-224233337-U

Abstract

The utility model discloses a multifunctional protection circuit of a relay protection tester voltage source and a tester, wherein the circuit comprises a voltage source power amplifying circuit, a voltage comparing circuit, a chip power filtering circuit, an optocoupler delay circuit and an optocoupler isolation alarm reporting circuit, the optocoupler delay circuit comprises an optocoupler U2, a voltage stabilizing tube D2 and a triode Q1, the 3 rd pin of the optocoupler U2 is connected with the 1 st pin of the voltage stabilizing tube D2, the 2 nd pin and the 3 rd pin of the voltage stabilizing tube D2 are connected with the 1 st pin of the triode Q1, the optocoupler isolation alarm reporting circuit comprises an optocoupler U3 and a resistor R4, and the 4 th pin of the optocoupler U3 is connected with the 2 nd pin of the resistor R4 and then connected with an alarm signal reporting GJ end. The utility model integrates multiple protection functions such as overvoltage protection, undervoltage protection, short circuit protection, overload protection and the like into a single circuit structure, thereby realizing the modularized integration of the protection system.

Inventors

  • LIANG DONGLIN
  • CHENG CONGMIN

Assignees

  • 广东昂立电气自动化有限公司

Dates

Publication Date
20260512
Application Date
20250508

Claims (10)

  1. 1. The multifunctional protection circuit for the voltage source of the relay protection tester is characterized by comprising a voltage source power amplifying circuit (1), a voltage comparison circuit (2), a chip power supply filter circuit (3), an optocoupler delay circuit (4) and an optocoupler isolation alarm reporting circuit (5); The voltage source power amplifying circuit (1) comprises an MOS tube driving module U5 and an operational amplifier U4.1, wherein the MOS tube driving module U5 is connected with the output end of the operational amplifier U4.1 and outputs a monitoring signal through an alarm detection signal end BJ; The voltage comparison circuit (2) comprises a comparator U1.1 and a comparator U1.2, wherein the comparator U1.1 and the comparator U1.2 respectively receive BJ end signals and reference voltages jz+ and jz-, and an output end of the comparator U1.1 and the comparator U1.2 forms an AND logic gate through a diode D1; The chip power supply filter circuit (3) is provided with a capacitor C1 and a capacitor C2 for carrying out AGND filtering on the power supply V+ and V-; The optocoupler delay circuit (4) comprises an optocoupler U2, a voltage stabilizing tube D2 and a triode Q1, wherein the 3 rd pin of the optocoupler U2 is connected with the 1 st pin of the voltage stabilizing tube D2, and the 2 nd pin and the 3 rd pin of the voltage stabilizing tube D2 are connected with the 1 st pin of the triode Q1; The optical coupler isolation alarm reporting circuit (5) comprises an optical coupler U3 and a resistor R4, wherein the 4 th pin of the optical coupler U3 is connected with the 2 nd pin of the resistor R4 and then connected with an alarm signal reporting GJ end.
  2. 2. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 1, wherein the voltage source power amplification circuit (1) further comprises a voltage source filter circuit, the voltage source filter circuit comprises a capacitor C4 and a capacitor C5, one end of the capacitor C1 is grounded after being connected in parallel with the capacitor C2, the other end of the capacitor C1 is connected with an external power supply VCC, and the 1 st pin of the capacitor C5 is connected with the 8 pins of the operational amplifier U4.1.
  3. 3. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 1, wherein the voltage source power amplification circuit (1) further comprises a resistor R5 and a resistor R6, wherein the 2 pin of the operational amplifier U4.1 is connected with an input signal, the 3 pin of the operational amplifier U4.1 is connected with the 1 pin of the resistor R5, the 2 pin of the resistor R5 is connected with the AGND, the 1 pin of the operational amplifier U4.1 is connected with an alarm detection signal BJ end and then connected with the 3 pin of the MOS transistor driving module U5, the 1 pin of the MOS transistor driving module U5 is connected with the 1 pin of the MOS transistor Q3, the 2 pin of the MOS transistor driving module U5 is connected with the 3 pin of the MOS transistor Q2 and then connected with the output end OUT, the 2 pin of the resistor R6 is connected with the 1 pin of the resistor R5, and the 1 pin of the resistor R6 is connected with the output end OUT.
  4. 4. The multifunctional protection circuit for a voltage source of a relay protection tester according to claim 3, wherein the 3-pin power supply VDD of the MOS transistor Q3 and the 2-pin power supply VEE of the MOS transistor Q2.
  5. 5. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 1, wherein the pin 2 and the pin 5 of the comparator U1 are connected to the alarm detection signal BJ, the pin 3 of the comparator U1 and the pin 6 of the comparator U1 are respectively connected to the reference voltage jz+, jz-, the pin 1 of the comparator U1 and the pin 7 of the comparator U1 are respectively connected to the pin 1 and the pin 2 of the diode D1, and the pin 3 of the diode D1 is connected to the pin 2 of the U2 in the optocoupler delay circuit (4).
  6. 6. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 1, wherein the chip power supply filter circuit (3) comprises a capacitor C1 and a capacitor C2, one end of the capacitor C1 is grounded after being connected in parallel with the capacitor C2, the other end of the capacitor C2 is connected with an external power supply, and one end of the capacitor C2 connected with the external power supply is also connected with the output end of the comparator U1.1.
  7. 7. The multifunctional protection circuit of a voltage source of a relay protection tester according to claim 1, wherein the optocoupler delay circuit (4) further comprises a resistor R1, a resistor R2, a resistor R3 and a capacitor C3, wherein the 1 pin of the optocoupler U2 is connected to the 2 pin of the resistor R1, the 4 pin of the U2 is connected to the 2 pin of the resistor R2, the 1 pin of the C3 is connected with the 1 pin of the voltage stabilizing tube D2 and then connected to the 3 pin of the optocoupler U2, the 2 pin of the capacitor C3 is connected to AGND, the 2 pin and the 3 pin of the voltage stabilizing tube D2 are connected to the 1 pin of the triode Q1, the 2 pin of the Q1 is connected to AGND, and the 3 pin of the Q1 is connected to the 2 pin of the U3 in the optocoupler isolation alarm reporting circuit (5).
  8. 8. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 7, wherein the 1 pin of the resistor R1 is connected to a 12V power supply, the 1 pin of the resistor R2 is connected to the 12V power supply, and the 1 pin of the resistor R3 is connected to the 12V power supply.
  9. 9. The multifunctional protection circuit for the voltage source of the relay protection tester according to claim 1, wherein in the optocoupler isolation alarm reporting circuit (5), the 3 rd pin of the optocoupler U3 is connected with GND.
  10. 10. A relay protection tester, characterized by comprising the multifunctional protection circuit of the voltage source of the relay protection tester according to any one of claims 1-9.

Description

Multifunctional protection circuit for voltage source of relay protection tester and tester Technical Field The utility model belongs to the technical field of relay protection, and particularly relates to a multifunctional protection circuit for a voltage source of a relay protection tester and the relay protection tester. Background Along with the updating iteration of the relay protection tester, the requirements on the voltage source on the relay protection tester are changed in multiple aspects, such as improving the precision, enhancing the stability, increasing the output power and the like. The stability and reliability are the basic guarantee of a voltage source. Therefore, the protection circuit on the voltage source also becomes one of the important optimization objects. The protection circuits on the voltage source comprise an overvoltage protection circuit, an undervoltage protection circuit, a short-circuit protection circuit, an overload protection circuit and the like, the principles, structures and parameters of various protection circuits are different, and the characteristics of the protection circuits are required to be deeply understood by integrating the protection circuits on one board, so that complex circuit design and layout planning are performed. The design time and cost are increased, and the mutual interference between circuits is easily caused by improper design, so that the normal implementation of the protection function is influenced; the circuit board space is tense, wiring on the circuit board can be complicated by distributing the various protection circuits in tense and effective space, the distance between the circuits can be reduced, signal crosstalk and electromagnetic interference are easy to generate, and normal operation of the circuit is affected. Therefore, a circuit capable of integrating protection circuits such as an overvoltage protection circuit, an undervoltage protection circuit, a short-circuit protection circuit, an overload protection circuit and the like is needed, and the multifunctional protection of the voltage source of the relay protection tester is realized. Disclosure of utility model The utility model mainly aims to overcome the defects and shortcomings of the prior art and provides a multifunctional protection circuit for a voltage source of a relay protection tester and the relay protection tester, and the modular integration of a protection system is realized by integrating multiple protection functions such as overvoltage protection, undervoltage protection, short-circuit protection, overload protection and the like into a single circuit structure. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The utility model provides a multifunctional protection circuit for a voltage source of a relay protection tester, which comprises a voltage source power amplifying circuit, a voltage comparison circuit, a chip power supply filter circuit, an optocoupler delay circuit and an optocoupler isolation alarm reporting circuit; The voltage source power amplifying circuit comprises a MOS tube driving module U5 and an operational amplifier U4.1, wherein the MOS tube driving module U5 is connected with the output end of the operational amplifier U4.1 and outputs a monitoring signal through an alarm detection signal end BJ; the voltage comparison circuit comprises a comparator U1.1 and a comparator U1.2, wherein the comparator U1.1 and the comparator U1.2 respectively receive BJ end signals and reference voltages jz+ and jz-, and an output end of the comparator U1.1 and the comparator U1.2 form an AND logic gate through a diode D1; The chip power supply filter circuit is provided with a capacitor C1 and a capacitor C2 for carrying out AGND filtering on power supplies V+ and V-; The optocoupler delay circuit comprises an optocoupler U2, a voltage stabilizing tube D2 and a triode Q1, wherein the 3 rd pin of the optocoupler U2 is connected with the 1 st pin of the voltage stabilizing tube D2, and the 2 nd pin and the 3 rd pin of the voltage stabilizing tube D2 are connected with the 1 st pin of the triode Q1; The optical coupler isolation alarm reporting circuit comprises an optical coupler U3 and a resistor R4, wherein the 4 th pin of the optical coupler U3 is connected to the 2 nd pin of the resistor R4 and then connected to an alarm signal reporting GJ end. As the preferable technical scheme, the voltage source power amplifying circuit further comprises a voltage source filter circuit, the voltage source filter circuit comprises a capacitor C4 and a capacitor C5, one end of the capacitor C1 is grounded after the capacitor C2 is connected in parallel, the other end of the capacitor C2 is connected with an external power supply VCC, and the 1 st pin of the capacitor C5 is connected with the 8 pins of the operational amplifier U4.1. As an optimized technical scheme, the voltage source power amplifying circu