CN211790745U - High voltage detection instrument safety protection circuit - Google Patents
High voltage detection instrument safety protection circuit Download PDFInfo
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- CN211790745U CN211790745U CN202020245036.7U CN202020245036U CN211790745U CN 211790745 U CN211790745 U CN 211790745U CN 202020245036 U CN202020245036 U CN 202020245036U CN 211790745 U CN211790745 U CN 211790745U
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Abstract
The utility model discloses a high voltage detection instrument safety protection circuit, include: the overvoltage protection circuit comprises an overvoltage protection module, an overcurrent protection module, a control module, a filtering module and a power supply modulation module, wherein a triode Q2 in the overvoltage protection module is used for conducting circuit on-off on input power supply voltage, and a resistor R1 and a resistor R2 are connected in series to share a high voltage value; a triode Q3 and a triode Q4 in the overcurrent protection module are matched to detect the received current value; the on-off of a circuit is controlled by an electric signal fed back by a diode D11 through a one-way thyristor U3 in the control module; a capacitor C3 and a capacitor C4 in the filtering module filter redundant frequency generated by the input safe power supply voltage; the operational amplifier U2 in the power supply modulation module modulates the filtered power supply voltage to remove an interference electromagnetic source generated in the circuit, so that the safety of a high-voltage detection instrument is improved.
Description
Technical Field
The utility model belongs to the technical field of a power protection and specifically relates to a high voltage detection instrument safety protection circuit.
Background
The power supply protection is a detection and protection instrument for the electric equipment, and the stability and the safety of the electric equipment during working are protected by performing overvoltage protection, undervoltage protection, open-phase protection and phase sequence protection on input voltage.
The existing power supply protection circuit can only cut off the voltage exceeding the set power supply voltage and can not branch the high voltage to reach the safe power utilization voltage of the equipment; when the detection instrument is protected, the frequency which has been affected cannot be repaired; an interference source generated in the working process of the detection instrument cannot be removed, so that the precision of the detection instrument and the stability of the power supply voltage are influenced.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the safety protection circuit of the high-voltage detection instrument is provided to solve the problems in the prior art.
The technical scheme is as follows: a high voltage detection instrument safety protection circuit comprising: the overvoltage protection circuit comprises an overvoltage protection module, an overcurrent protection module, a control module, a filtering module and a power supply modulation module, wherein a triode Q2 in the overvoltage protection module is used for conducting circuit on-off on input power supply voltage, and a resistor R1 and a resistor R2 are connected in series to share a high voltage value; a triode Q3 and a triode Q4 in the overcurrent protection module are matched to detect the received current value; the on-off of a circuit is controlled by an electric signal fed back by a diode D11 through a one-way thyristor U3 in the control module; a capacitor C3 and a capacitor C4 in the filtering module filter redundant frequency generated by the input safe power supply voltage; and an operational amplifier U2 in the power supply modulation module modulates the filtered power supply voltage to remove the interference electromagnetic source generated in the circuit.
In a further embodiment, the overvoltage protection module includes a resistor R1, a resistor R2, a diode D2, a transistor Q2, a resistor R3, a transistor Q1, a resistor R4, and a diode D1, wherein one end of the resistor R1 is connected to the negative terminal of the diode D2, the emitter terminal of the transistor Q2, one end of the resistor R3, and pin 1 of the transistor Q1, respectively; the other end of the resistor R1 is respectively connected with one end of a resistor R2 and the negative end of a diode D1; the positive end of the diode D1 is respectively connected with the collector terminal of the triode Q2, the other end of the resistor R3, two ends of the resistor R4, the pin 2 of the transistor Q1 and the ground wire GND; the other end of the resistor R2 is respectively connected with the anode end of a diode D2 and the base end of a triode Q2.
In a further embodiment, the overcurrent protection module includes a resistor R5, a transistor Q3, a resistor R6, a transistor Q4, a capacitor C1, a resistor R9, and a capacitor C2, wherein one end of the resistor R5 is connected to pin 3 of the transistor Q1; the other end of the resistor R5 is connected with the base terminal of a triode Q3; the collector terminal of the triode Q3 is respectively connected with one end of a capacitor C1 and the collector terminal of the triode Q4; the emitter terminal of the triode Q3 is respectively connected with the base terminal of the triode Q4 and one end of the resistor R6; the emitter terminal of the triode Q4 is connected with the other end of the resistor R6; the other end of the capacitor C1 is respectively connected with one end of a resistor R9 and the positive end of a capacitor C2.
In a further embodiment, the control module comprises a diode D6, a diode D11, a one-way thyristor U3, a resistor R12 and a resistor R15, wherein the positive terminal of the diode D6 is respectively connected with the other terminal of the resistor R5 and the base terminal of a triode Q3; the negative end of the diode D6 is connected with the positive end of the one-way thyristor U3; the pin 1 of the one-way thyristor U3 is respectively connected with the cathode end of a diode D11, one end of a resistor R12 and one end of a resistor R15; the positive end of the diode D11 is respectively connected with the emitter end of the triode Q4 and the other end of the resistor R6; the other end of the resistor R12 is respectively connected with the other end of the resistor R15 and a ground wire GND.
In a further embodiment, the filtering module includes an operational amplifier U1, a resistor R11, a resistor R13, a capacitor C3, a resistor R14, a resistor R10, a resistor R16, and a capacitor C4, where the pin 3 and the pin 6 of the operational amplifier U1 are respectively connected to one end of the resistor R11, one end of the resistor R13, the other end of the capacitor C1, one end of the resistor R9, and the positive end of the capacitor C2; the pin 2 of the operational amplifier U1 is respectively connected with one end of a resistor R10 and the negative end of a capacitor C2; pin 4 of the operational amplifier U1 is connected with the negative end of a one-way thyristor U1; the other end of the resistor R10 is respectively connected with one end of a resistor R14 and a ground wire GND; the other end of the resistor R13 is respectively connected with the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; the positive end of the capacitor C3 is connected with the other end of the resistor R14; the other end of the resistor R16 is connected with the positive end of the capacitor C4.
In a further embodiment, the power supply modulation module comprises an operational amplifier U2, a resistor R17, and a capacitor C5, wherein pin 2 of the operational amplifier U2 is connected to 1 one end of a capacitor C5, one end of a resistor R17, a positive end of a capacitor C3, and the other end of a resistor R14; the pin 3 of the operational amplifier U2 is respectively connected with the other end of the resistor R13, the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; and the pin 6 of the operational amplifier U2 is respectively connected with the other end of the resistor R17 and the other end of the capacitor C5.
In a further embodiment, the diode D1 and the diode D6 are both zener diodes; the triode Q2 model PNP; the model of the triode Q3 and the model of the triode Q4 are both NPN; the capacitor C2, the capacitor C3 and the capacitor C3 are all electrolytic capacitors.
Has the advantages that: the utility model discloses a diode D2 reverse conduction, resistance R1 and resistance R2 concatenate and form mains voltage bleeder circuit when exceeding the numerical value that mains voltage set for in the voltage module, reduce the influence of high voltage to consumer; the voltage value of the divided voltage is modulated to meet the safety of the electric equipment, so that the influence of the equipment in sudden power failure is reduced; the capacitor C3 and the capacitor C4 in the filtering module filter redundant frequency generated by the input safe voltage, and reduce the influence of noise frequency band generated when high voltage is reduced on electric equipment; in the power supply modulation module, the operational amplifier U2 modulates the filtered power supply voltage to remove the interference electromagnetic source generated in the power supply, thereby improving the stability of the power supply voltage output and the safety of the detection instrument.
Drawings
Fig. 1 is a circuit diagram of the module of the present invention.
Fig. 2 is a circuit diagram of the overvoltage protection module of the present invention.
Fig. 3 is a circuit diagram of the overcurrent module of the present invention.
Fig. 4 is a circuit diagram of the control module of the present invention.
Fig. 5 is a circuit diagram of the filter module of the present invention.
Fig. 6 is a circuit diagram of the power supply modulation module of the present invention.
Detailed Description
Referring to fig. 1 to 6, a safety protection circuit for a high voltage detecting instrument includes: the overvoltage protection module comprises a resistor R1, a resistor R2, a diode D2, a triode Q2, a resistor R3, a transistor Q1, a resistor R4 and a diode D1.
The overcurrent protection module comprises a resistor R5, a triode Q3, a resistor R6, a triode Q4, a capacitor C1, a resistor R9 and a capacitor C2.
The control module comprises a diode D6, a diode D11, a one-way thyristor U3, a resistor R12 and a resistor R15.
The filter module comprises an operational amplifier U1, a resistor R11, a resistor R13, a capacitor C3, a resistor R14, a resistor R10, a resistor R16 and a capacitor C4.
And the power supply modulation module comprises an operational amplifier U2, a resistor R17 and a capacitor C5.
One end of the resistor R1 in the overvoltage protection module is respectively connected with the cathode end of the diode D2, the emitter end of the triode Q2, one end of the resistor R3 and the pin 1 of the transistor Q1; the other end of the resistor R1 is respectively connected with one end of a resistor R2 and the negative end of a diode D1; the positive end of the diode D1 is respectively connected with the collector terminal of the triode Q2, the other end of the resistor R3, two ends of the resistor R4, the pin 2 of the transistor Q1 and the ground wire GND; the other end of the resistor R2 is respectively connected with the anode end of a diode D2 and the base end of a triode Q2.
One end of the resistor R5 in the overcurrent protection module is connected with a pin 3 of a transistor Q1; the other end of the resistor R5 is connected with the base terminal of a triode Q3; the collector terminal of the triode Q3 is respectively connected with one end of a capacitor C1 and the collector terminal of the triode Q4; the emitter terminal of the triode Q3 is respectively connected with the base terminal of the triode Q4 and one end of the resistor R6; the emitter terminal of the triode Q4 is connected with the other end of the resistor R6; the other end of the capacitor C1 is respectively connected with one end of a resistor R9 and the positive end of a capacitor C2.
The positive end of the diode D6 in the control module is respectively connected with the other end of the resistor R5 and the base end of the triode Q3; the negative end of the diode D6 is connected with the positive end of the one-way thyristor U3; the pin 1 of the one-way thyristor U3 is respectively connected with the cathode end of a diode D11, one end of a resistor R12 and one end of a resistor R15; the positive end of the diode D11 is respectively connected with the emitter end of the triode Q4 and the other end of the resistor R6; the other end of the resistor R12 is respectively connected with the other end of the resistor R15 and a ground wire GND.
The pin 3 and the pin 6 of the operational amplifier U1 in the filtering module are respectively connected with one end of a resistor R11, one end of a resistor R13, the other end of a capacitor C1, one end of a resistor R9 and the positive end of a capacitor C2; the pin 2 of the operational amplifier U1 is respectively connected with one end of a resistor R10 and the negative end of a capacitor C2; pin 4 of the operational amplifier U1 is connected with the negative end of a one-way thyristor U1; the other end of the resistor R10 is respectively connected with one end of a resistor R14 and a ground wire GND; the other end of the resistor R13 is respectively connected with the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; the positive end of the capacitor C3 is connected with the other end of the resistor R14; the other end of the resistor R16 is connected with the positive end of the capacitor C4.
The power supply modulation module in the power supply modulation module comprises an operational amplifier U2, a resistor R17 and a capacitor C5, wherein a pin 2 of the operational amplifier U2 is respectively connected with one end of a capacitor C5, one end of a resistor R17, the positive end of a capacitor C3 and the other end of a resistor R14; the pin 3 of the operational amplifier U2 is respectively connected with the other end of the resistor R13, the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; and the pin 6 of the operational amplifier U2 is respectively connected with the other end of the resistor R17 and the other end of the capacitor C5.
The working principle is as follows: the electric signal carries on the make-and-break of the circuit to the mains voltage that is input through the triode Q2, when the high voltage exceeds the set value of the detection mains voltage, resistance R1 and resistance R2 are connected in series and share the high voltage value, the transistor Q1 is used for switching over fast according to the output current of voltage control input; the triode Q3 and the triode Q4 are matched to detect the received current value, and the capacitor C1 and the resistor R9 provide a charge storage resistor R9 for the circuit to consume the current affecting the components; the unidirectional silicon controlled rectifier U3 controls the on-off of the circuit through an electric signal fed back by the diode D11, the diode D6 obtains an instruction of the triode Q3 and transmits the electric signal to the operational amplifier U1 through the unidirectional silicon controlled rectifier U3, and the capacitor C3 and the capacitor C4 filter redundant frequency generated by the input safe power supply voltage; the operational amplifier U2 modulates the filtered power supply voltage to remove the interference electromagnetic source generated in the circuit, thereby improving the stability of the power supply voltage output and the safety of the detection instrument in working.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be modified to perform various equivalent transformations, which all belong to the protection scope of the present invention.
Claims (5)
1. The utility model provides a high voltage detection instrument safety protection circuit, characterized by includes: the overvoltage protection circuit comprises an overvoltage protection module, an overcurrent protection module, a control module, a filtering module and a power supply modulation module, wherein a triode Q2 in the overvoltage protection module is used for conducting circuit on-off on input power supply voltage, and a resistor R1 and a resistor R2 are connected in series to share a high voltage value; a triode Q3 and a triode Q4 in the overcurrent protection module are matched to detect the received current value; the on-off of a circuit is controlled by an electric signal fed back by a diode D11 through a one-way thyristor U3 in the control module; a capacitor C3 and a capacitor C4 in the filtering module filter redundant frequency generated by the input safe power supply voltage; an operational amplifier U2 in the power supply modulation module modulates the filtered power supply voltage to remove an interference electromagnetic source generated in the circuit; the overvoltage protection module comprises a resistor R1, a resistor R2, a diode D2, a triode Q2, a resistor R3, a transistor Q1, a resistor R4 and a diode D1, wherein one end of the resistor R1 is respectively connected with the cathode end of a diode D2, the emitter end of the triode Q2, one end of a resistor R3 and a pin 1 of the transistor Q1; the other end of the resistor R1 is respectively connected with one end of a resistor R2 and the negative end of a diode D1; the positive end of the diode D1 is respectively connected with the collector terminal of the triode Q2, the other end of the resistor R3, two ends of the resistor R4, the pin 2 of the transistor Q1 and the ground wire GND; the other end of the resistor R2 is respectively connected with the anode end of a diode D2 and the base end of a triode Q2.
2. The safety protection circuit of the high voltage detection instrument according to claim 1, wherein: the overcurrent protection module comprises a resistor R5, a triode Q3, a resistor R6, a triode Q4, a capacitor C1, a resistor R9 and a capacitor C2, wherein one end of the resistor R5 is connected with a pin 3 of a transistor Q1; the other end of the resistor R5 is connected with the base terminal of a triode Q3; the collector terminal of the triode Q3 is respectively connected with one end of a capacitor C1 and the collector terminal of the triode Q4; the emitter terminal of the triode Q3 is respectively connected with the base terminal of the triode Q4 and one end of the resistor R6; the emitter terminal of the triode Q4 is connected with the other end of the resistor R6; the other end of the capacitor C1 is respectively connected with one end of a resistor R9 and the positive end of a capacitor C2.
3. The safety protection circuit of the high voltage detection instrument according to claim 1, wherein: the control module comprises a diode D6, a diode D11, a one-way thyristor U3, a resistor R12 and a resistor R15, wherein the positive end of the diode D6 is respectively connected with the other end of the resistor R5 and the base end of a triode Q3; the negative end of the diode D6 is connected with the positive end of the one-way thyristor U3; the pin 1 of the one-way thyristor U3 is respectively connected with the cathode end of a diode D11, one end of a resistor R12 and one end of a resistor R15; the positive end of the diode D11 is respectively connected with the emitter end of the triode Q4 and the other end of the resistor R6; the other end of the resistor R12 is respectively connected with the other end of the resistor R15 and a ground wire GND.
4. The safety protection circuit of the high voltage detection instrument according to claim 1, wherein: the filtering module comprises an operational amplifier U1, a resistor R11, a resistor R13, a capacitor C3, a resistor R14, a resistor R10, a resistor R16 and a capacitor C4, wherein a pin 3 and a pin 6 of the operational amplifier U1 are respectively connected with one end of a resistor R11, one end of the resistor R13, the other end of the capacitor C1, one end of the resistor R9 and the positive end of a capacitor C2; the pin 2 of the operational amplifier U1 is respectively connected with one end of a resistor R10 and the negative end of a capacitor C2; pin 4 of the operational amplifier U1 is connected with the negative end of a one-way thyristor U1; the other end of the resistor R10 is respectively connected with one end of a resistor R14 and a ground wire GND; the other end of the resistor R13 is respectively connected with the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; the positive end of the capacitor C3 is connected with the other end of the resistor R14; the other end of the resistor R16 is connected with the positive end of the capacitor C4.
5. The safety protection circuit of the high voltage detection instrument according to claim 1, wherein: the power supply modulation module comprises an operational amplifier U2, a resistor R17 and a capacitor C5, wherein a pin 2 of the operational amplifier U2 is respectively connected with one end of a capacitor C5, one end of a resistor R17, the positive end of a capacitor C3 and the other end of a resistor R14; the pin 3 of the operational amplifier U2 is respectively connected with the other end of the resistor R13, the negative end of the capacitor C3, one end of the resistor R16 and the negative end of the capacitor C4; and the pin 6 of the operational amplifier U2 is respectively connected with the other end of the resistor R17 and the other end of the capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020245036.7U CN211790745U (en) | 2020-03-03 | 2020-03-03 | High voltage detection instrument safety protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020245036.7U CN211790745U (en) | 2020-03-03 | 2020-03-03 | High voltage detection instrument safety protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211790745U true CN211790745U (en) | 2020-10-27 |
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ID=72901889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020245036.7U Expired - Fee Related CN211790745U (en) | 2020-03-03 | 2020-03-03 | High voltage detection instrument safety protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211790745U (en) |
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2020
- 2020-03-03 CN CN202020245036.7U patent/CN211790745U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201027 Termination date: 20210303 |
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| CF01 | Termination of patent right due to non-payment of annual fee |