Voltage protection plate

Abstract

The utility model discloses a voltage protection board which comprises a power supply module and a voltage detection module which are connected with a mains supply input module, the power supply module is electrically connected with the voltage detection module, and one end of the voltage detection module is connected with a voltage comparison and control module. One end of the voltage comparison and control module is connected with a voltage cut-off protection module which is respectively connected with the commercial power input module and the commercial power output module, and the voltage comparison and control module comprises a comparison chip U1; according to the utility model, after the commercial power is input, the voltage can be detected, the voltage is compared through the comparator, the output of the voltage is controlled, and if the output voltage exceeds the threshold value of the set voltage, the circuit is automatically cut off, so that the electric appliance equipment can be effectively prevented from being burnt out when the commercial power voltage is too high or the 220V commercial power is wrongly connected with the 380V commercial power, and the damage of the high voltage to the electric appliance equipment is reduced; and the equipment is stopped or even damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage protection plates, in particular to a voltage protection plate. Background Art

[0002] A voltage protection board is a device used to protect circuits and can be used to prevent damage to electronic devices caused by overvoltage or undervoltage. It usually monitors the input voltage and triggers a protection mechanism to protect the connected device once it detects that the voltage is out of the set range. This ensures that the electronic device operates within a safe operating range and avoids damage to it caused by overvoltage or undervoltage.

[0003] After searching, the patent with application number 201521068519.X discloses a voltage control circuit. The circuit includes: a voltage source unit for outputting a high-precision standard voltage; a battery protection board for receiving a high-precision standard voltage; a voltage feedback circuit connected to the battery protection board for feeding back the high-precision standard voltage received by the battery protection board to the control circuit; a control circuit for comparing the high-precision standard voltage with a preset value and controlling the voltage output of the voltage source unit according to the comparison result; a first display unit connected to the voltage source unit for receiving the result of the voltage output sent by the voltage source unit, wherein the result of the voltage output includes at least: successful voltage output and failed voltage output. The utility model solves the technical problem that the reference voltage accuracy of the battery protection board is low, resulting in overcharging or undercharging of the battery.

[0004] The above solution does not have an overvoltage protection mechanism. When the mains voltage exceeds the set safety range (220V), or the mains is connected to the wrong 380V mains, the equipment in the circuit will be subjected to high voltage. If the circuit is not cut off in time, the electrical equipment will be damaged by the high voltage, causing the equipment to stop operating or even be damaged. Therefore, we need to propose a voltage protection board. Utility Model Content

[0005] The purpose of the utility model is to provide a voltage protection board, which can detect the voltage after the mains power is input, compare the voltage through a comparator, and control the output of the voltage. If the output voltage exceeds the set voltage threshold, the circuit is automatically cut off, which can effectively prevent the mains voltage from being too high or the 220V mains power from being connected to the 380V mains power by mistake, which may burn out electrical equipment, reduce the risk of electrical equipment being damaged by high voltage, causing equipment shutdown or even damage, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a voltage protection board, comprising a power supply module and a voltage detection module connected to a mains input module, the power supply module and the voltage detection module are electrically connected, one end of the voltage detection module is connected to a voltage comparison and control module, and one end of the voltage comparison and control module is connected to a voltage cut-off protection module respectively connected to the mains input module and the mains output module;

[0007] The voltage comparison and control module includes a comparison chip U1, a diode D10 is connected between pins 1 and 5 of the comparison chip U1, one end of the diode D10 is connected to a grounded capacitor C3, a resistor R5 and a resistor R7 are connected in parallel between pins 3 and 4 of the comparison chip U1, and one end of the resistor R7 is connected to a grounded resistor R6;

[0008] The voltage cut-off protection module includes a transistor Q1, the base of which is connected to a resistor R13, one end of which is respectively connected to a resistor R7 and pin 4 of a comparison chip U1, a diode D7 and a relay switch K1 for controlling the on and off of a live wire L are connected to the collector of the transistor Q1, and one end of the diode D7 is connected to a resistor R15 connected to 12V.

[0009] Preferably, the pin 4 of the comparison chip U1 is connected to a resistor R12, and the pin 5 of the comparison chip U1, one end of the resistor R12 and one end of the resistor R5 are all connected to 5V.

[0010] Preferably, the voltage detection module includes a capacitor C4 and a resistor R11 connected in parallel between pin 1 and pin 2 of the comparison chip U1, a fuse F1 and a resistor R1 connected to the live wire L, one end of the resistor R11 is connected to resistor R10, resistor R9 and resistor R8 in sequence, the other end of the resistor R11 is connected to resistor R18, resistor R17 and resistor R16 in sequence, and the resistor R8 is connected to resistor R16.

[0011] Preferably, the fuse F1 is connected to the connection terminals of the resistor R8 and the resistor R16, and a grounded capacitor C5 is connected between the fuse F1 and the resistor R8. One end of the resistor R1 is connected to the capacitor C1, and the capacitor C1 is connected in parallel with resistors R2, R3 and R4 which are arranged in series.

[0012] Preferably, the power supply module includes a diode D5 and a capacitor C2 arranged in parallel, one end of the capacitor C2 is connected to a resistor R40 connected to 5V, the diode D5 is connected in parallel with a diode D2 and a diode D4 arranged in series, the wiring ends of the diode D2 and the diode D4 are connected to the neutral line N, and the diode D5 is also connected in parallel with a diode D1 and a diode D3 arranged in series, and the wiring ends of the diode D1 and the diode D3 are connected to the capacitor C1.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model can detect the voltage after the AC power is input, compare the voltage through the comparator, and control the output of the voltage. If the output voltage exceeds the set voltage threshold, the circuit is automatically cut off, which can effectively prevent the AC power voltage from being too high or the 220V AC power from being connected to the 380V AC power by mistake, thereby reducing the risk of the electrical equipment being damaged by the high voltage, causing the equipment to stop operating or even be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A circuit diagram of the utility model;

[0016] Figure 2 It is a flowchart of the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 The utility model provides a technical solution: a voltage protection board, comprising a power supply module and a voltage detection module connected to a mains input module, the power supply module and the voltage detection module are electrically connected, one end of the voltage detection module is connected to a voltage comparison and control module, and one end of the voltage comparison and control module is connected to a voltage cut-off protection module respectively connected to the mains input module and the mains output module;

[0019] The voltage comparison and control module includes a comparison chip U1, the model of the comparison chip U1 is LM397, a diode D10 is connected between pin 1 and pin 5 of the comparison chip U1, one end of the diode D10 is connected to a grounded capacitor C3, a resistor R5 and a resistor R7 arranged in parallel are connected between pin 3 and pin 4 of the comparison chip U1, and one end of the resistor R7 is connected to a grounded resistor R6;

[0020] The capacitance of capacitor C3 is 225 μF, the resistance of resistor R5 is 10K ohms, the resistance of resistor R7 is 100K ohms, and the resistance of resistor R6 is 10K ohms.

[0021] The voltage cut-off protection module includes a transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to a resistor R13, one end of the resistor R13 is respectively connected to a resistor R7 and pin 4 of a comparison chip U1, a diode D7 and a relay switch K1 for controlling the on and off of a live wire L are connected to the collector of the transistor Q1, one end of the diode D7 is connected to a resistor R15 connected to 12V, and a control switch in the relay switch K1 is connected to an end close to the output end of the live wire L.

[0022] The model of transistor Q1 is 2SC2873, the resistance value of resistor R13 is 3.9K ohms, and the resistance value of resistor R15 is 10K ohms.

[0023] Pin 4 of the comparison chip U1 is connected to a resistor R12, and pin 5 of the comparison chip U1, one end of the resistor R12, and one end of the resistor R5 are all connected to 5 V. The resistance value of the resistor R12 is 1.3K ohms.

[0024] The voltage detection module includes a capacitor C4 and a resistor R11 connected in parallel between pin 1 and pin 2 of the comparison chip U1, a fuse F1 and a resistor R1 connected to the live wire L, pin 2 of the comparison chip U1 is grounded, one end of the resistor R11 is connected to resistors R10, R9 and R8 in sequence, the other end of the resistor R11 is connected to resistors R18, R17 and R16 in sequence, and the resistor R8 is connected to resistor R16.

[0025] The capacitance of capacitor C4 is 102 μF, the resistance of resistor R11 is 5.1K ohms, and the resistances of resistors R10 , R9 , R8 , R18 , R17 , and R16 are all 300K ohms.

[0026] The fuse F1 is connected to the connection terminals of the resistor R8 and the resistor R16, and a grounded capacitor C5 is connected between the fuse F1 and the resistor R8. One end of the resistor R1 is connected to the capacitor C1, and the resistor R2, the resistor R3 and the resistor R4 are connected in parallel in series to the capacitor C1.

[0027] The capacitance of capacitor C5 is 105 μF, the resistances of resistors R2 , R3 and R4 are all 180K ohms, and the capacitance of capacitor C1 is 125 μF.

[0028] The power supply module includes a diode D5 and a capacitor C2 arranged in parallel, one end of the capacitor C2 is connected to a resistor R40 connected to 5V, the other end of the capacitor C2 is grounded, the diode D5 is connected in parallel with a diode D2 and a diode D4 arranged in series, the connection ends of the diode D2 and the diode D4 are connected to the neutral line N, and the diode D5 is also connected in parallel with a diode D1 and a diode D3 arranged in series, and the connection ends of the diode D1 and the diode D3 are connected to the capacitor C1.

[0029] The capacitance of capacitor C2 is 220 μF, and the resistance of resistor R40 is 1.5K ohms.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Voltage protection board, characterized in that: It includes a power supply module and a voltage detection module connected to the mains input module, the power supply module and the voltage detection module are electrically connected, one end of the voltage detection module is connected to a voltage comparison and control module, and one end of the voltage comparison and control module is connected to a voltage cut-off protection module respectively connected to the mains input module and the mains output module; The voltage comparison and control module includes a comparison chip U1, a diode D10 is connected between pins 1 and 5 of the comparison chip U1, one end of the diode D10 is connected to a grounded capacitor C3, a resistor R5 and a resistor R7 are connected in parallel between pins 3 and 4 of the comparison chip U1, and one end of the resistor R7 is connected to a grounded resistor R6; The voltage cut-off protection module includes a transistor Q1, the base of which is connected to a resistor R13, one end of which is respectively connected to a resistor R7 and pin 4 of a comparison chip U1, a diode D7 and a relay switch K1 for controlling the on and off of a live wire L are connected to the collector of the transistor Q1, and one end of the diode D7 is connected to a resistor R15 connected to 12V.

2. The voltage protection board according to claim 1, characterized in that: Pin 4 of the comparison chip U1 is connected to a resistor R12 , and pin 5 of the comparison chip U1 , one end of the resistor R12 , and one end of the resistor R5 are all connected to 5V.

3. The voltage protection board according to claim 1, characterized in that: The voltage detection module includes a capacitor C4 and a resistor R11 connected in parallel between pin 1 and pin 2 of the comparison chip U1, a fuse F1 and a resistor R1 connected to the live wire L, one end of the resistor R11 is connected to resistors R10, R9 and R8 in sequence, the other end of the resistor R11 is connected to resistors R18, R17 and R16 in sequence, and the resistor R8 is connected to resistor R16.

4. The voltage protection board according to claim 3, characterized in that: The fuse F1 is connected to the connection terminals of the resistor R8 and the resistor R16, and a grounded capacitor C5 is connected between the fuse F1 and the resistor R8. One end of the resistor R1 is connected to the capacitor C1, and the resistor R2, the resistor R3 and the resistor R4 are connected in parallel in series to the capacitor C1.

5. The voltage protection board according to claim 4, characterized in that: The power supply module includes a diode D5 and a capacitor C2 arranged in parallel, one end of the capacitor C2 is connected to a resistor R40 connected to 5V, the diode D5 is connected in parallel with a diode D2 and a diode D4 arranged in series, the connection ends of the diode D2 and the diode D4 are connected to the neutral line N, and the diode D5 is also connected in parallel with a diode D1 and a diode D3 arranged in series, and the connection ends of the diode D1 and the diode D3 are connected to the capacitor C1.

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