CN213122088U - Voltage detection circuit - Google Patents
Voltage detection circuit Download PDFInfo
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- CN213122088U CN213122088U CN202021564330.0U CN202021564330U CN213122088U CN 213122088 U CN213122088 U CN 213122088U CN 202021564330 U CN202021564330 U CN 202021564330U CN 213122088 U CN213122088 U CN 213122088U
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- triode
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Abstract
The utility model relates to the technical field of voltage detection, in particular to a voltage detection circuit, which comprises a voltage stabilizing circuit, a PNP circuit and an NPN circuit, when the voltage stabilizing circuit is connected with 12V direct current, the EB two-stage voltage of the triode Q1 is-1.7V, and the triode Q2 is not conducted, so the output end is high level, when the 12V direct current connected with the voltage stabilizing circuit is cut off, the EB two-stage voltage of the triode Q1 is 0.7V at the moment, so that the triode Q1 is conducted, the triode Q2 is conducted, the output end is at a low level, can be according to the utility model discloses come the signal of conversion output, the utility model provides a simple and easy, low-cost voltage detection circuit's method adopts zener diode, PNP circuit and NPN circuit to design the power down detection circuit, has in addition the utility model has the advantages of simple structure and reasonable design, the effectual manufacturing cost who reduces voltage detection circuit.
Description
Technical Field
The utility model belongs to the technical field of voltage detection technique and specifically relates to indicate a voltage detection circuit.
Background
Currently, in the field of voltage detection, voltage detection and comparison are required in many applications. In order to compare the relationship between the input voltage and the set threshold, some controllers are connected with the ADC, and some controllers need to be realized by connecting a threshold comparison circuit with the control module, however, most of the controllers of the system, such as the MCU, have redundant common IO ports and the ADC ports are very scarce when in use.
SUMMERY OF THE UTILITY MODEL
The utility model discloses problem to prior art provides a detect convenient voltage detection circuit.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a pair of voltage detection circuit, including voltage stabilizing circuit, PNP circuit and NPN circuit, the external 12V direct current of input of voltage stabilizing circuit, the PNP circuit includes triode Q1, resistance R5, resistance R6, resistance R7 and electric capacity C2, the NPN circuit includes triode Q2, resistance R8, resistance R9, the output of voltage stabilizing circuit passes through resistance R5 with triode Q1's base is connected, triode Q1's projecting pole passes through the external 3V direct current of resistance R7, triode Q1's collecting electrode passes through resistance R6 ground connection, triode Q1's collecting electrode passes through resistance R8 with triode Q2's base is connected, triode Q1's projecting pole passes through electric capacity C2 ground connection, triode Q2's projecting pole ground connection, triode Q1's collecting electrode passes through the external 3V direct current of resistance R9, the collector of the transistor Q1 is the output terminal.
Preferably, the voltage stabilizing circuit comprises a voltage stabilizing chip TL431, a resistor R1, a resistor R2 and a capacitor C1, wherein one end of the resistor R1 is connected with an external 12V direct current, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the voltage stabilizing chip TL431 is connected with the other end of the resistor R2 and one end of the capacitor C1 respectively, the other end of the voltage stabilizing chip TL431 is connected with an external 12V direct current, and the other end of the capacitor C1 is grounded.
Preferably, the voltage regulation chip TL431 is a voltage regulation diode.
Preferably, a control switch is arranged between the voltage stabilizing circuit and the PNP circuit, and the control switch is a control button switch.
Preferably, the transistor Q1 and the transistor Q2 are both MMBT 3906.
Preferably, the output end of the triode Q2 is connected with a detector and an alarm, and the alarm is a light emitting diode D1.
The utility model has the advantages that:
the utility model provides a pair of voltage detection circuit, including voltage stabilizing circuit, PNP circuit and NPN circuit, the utility model discloses when voltage stabilizing circuit switch-on 12V direct current, triode Q1's EB two-stage voltage is-1.7V, triode Q2 does not switch on, therefore the output is the high level, when the 12V direct current that disconnection voltage stabilizing circuit connects, triode Q1's EB two-stage voltage is 0.7V this moment for triode Q1 switches on, and triode Q2 switches on, and consequently the output is the low level, can according to the utility model discloses the signal of output is converted, the utility model provides a simple and easy, low-cost voltage detection circuit's method adopts zener diode, PNP circuit and NPN circuit to design the power failure detection circuit, still the utility model discloses simple structure, reasonable in design, the effectual manufacturing cost who reduces voltage detection circuit.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
The utility model provides a pair of voltage detection circuit, including voltage stabilizing circuit, PNP circuit and NPN circuit, the external 12V direct current of input of voltage stabilizing circuit, the PNP circuit includes triode Q1, resistance R5, resistance R6, resistance R7 and electric capacity C2, the NPN circuit includes triode Q2, resistance R8, resistance R9, the output of voltage stabilizing circuit passes through resistance R5 with triode Q1's base is connected, triode Q1's projecting pole passes through the external 3V direct current of resistance R7, triode Q1's collecting electrode passes through resistance R6 ground connection, triode Q1's collecting electrode passes through resistance R8 with triode Q2's base is connected, triode Q1's projecting pole passes through electric capacity C2 ground connection, triode Q2's projecting pole ground connection, triode Q1's collecting electrode passes through the external 3V direct current of resistance R9, the collector of triode Q1 is the output, the utility model discloses when voltage stabilizing circuit switch-on 12V direct current, triode Q1's EB two-stage voltage is-1.7V, triode Q2 does not switch on, therefore the output is the high level, when the 12V direct current that disconnection voltage stabilizing circuit connects, triode Q1's EB two-stage voltage is 0.7V this moment for triode Q1 switches on, triode Q2 switches on, therefore the output is the low level, can according to the utility model discloses the signal of output is converted, the utility model provides a simple and easy, low-cost voltage detection circuit's method adopts zener diode, PNP circuit and NPN circuit to design the power failure detection circuit, in addition the utility model has the advantages of being simple in structure and reasonable in design, the effectual manufacturing cost who reduces voltage detection circuit.
In this embodiment, the voltage stabilizing circuit includes a voltage stabilizing chip TL431, a resistor R1, a resistor R2, and a capacitor C1, one end of the resistor R1 is connected to an external 12V dc current, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the voltage stabilizing chip TL431 is connected to the other end of the resistor R2 and one end of the capacitor C1, the other end of the voltage stabilizing chip TL431 is connected to an external 12V dc current, the other end of the capacitor C1 is grounded, and the voltage stabilizing chip TL431 is a zener diode.
In this embodiment, a control switch is disposed between the voltage stabilizing circuit and the PNP circuit, the control switch is a control button switch, and the voltage detecting circuit can be turned on and off by the control switch
In this embodiment, the transistors Q1 and Q2 are both MMBT 3906.
In this embodiment, the output terminal of the transistor Q2 is connected to a detector and an alarm, the alarm is a light emitting diode D1, when the transistor Q2 is turned on, the light emitting diode D1 is normally on, and the detector is used for detecting a turn-on signal.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.
Claims (6)
1. A voltage detection circuit, characterized by: comprises a voltage stabilizing circuit, a PNP circuit and an NPN circuit, wherein the input end of the voltage stabilizing circuit is externally connected with 12V direct current, the PNP circuit comprises a triode Q1, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2, the NPN circuit comprises a triode Q2, a resistor R8 and a resistor R9, the output end of the voltage stabilizing circuit is connected with the base electrode of the triode Q1 through the resistor R5, the emitter of the transistor Q1 is connected with 3V DC power through the resistor R7, the collector of the transistor Q1 is connected with the ground through the resistor R6, the collector of the transistor Q1 is connected with the base of the transistor Q2 through the resistor R8, the emitter of the transistor Q1 is grounded through the capacitor C2, the emitter of the transistor Q2 is grounded, the collector of the triode Q1 is externally connected with 3V direct current through the resistor R9, and the collector of the triode Q1 is an output end.
2. A voltage detection circuit according to claim 1, wherein: the voltage stabilizing circuit comprises a voltage stabilizing chip TL431, a resistor R1, a resistor R2 and a capacitor C1, wherein one end of the resistor R1 is connected with an external 12V direct current, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the voltage stabilizing chip TL431 is connected with the other end of the resistor R2 and one end of the capacitor C1 respectively, the other end of the voltage stabilizing chip TL431 is connected with an external 12V direct current, and the other end of the capacitor C1 is grounded.
3. A voltage detection circuit according to claim 2, wherein: the voltage regulation chip TL431 is a voltage regulation diode.
4. A voltage detection circuit according to claim 1, wherein: and a control switch is arranged between the voltage stabilizing circuit and the PNP circuit and is a control button switch.
5. A voltage detection circuit according to claim 1, wherein: the model of the triode Q1 and the model of the triode Q2 are both MMBT 3906.
6. A voltage detection circuit according to claim 1, wherein: the output end of the triode Q2 is connected with a detector and an alarm, and the alarm is a light-emitting diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021564330.0U CN213122088U (en) | 2020-07-31 | 2020-07-31 | Voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021564330.0U CN213122088U (en) | 2020-07-31 | 2020-07-31 | Voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213122088U true CN213122088U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021564330.0U Active CN213122088U (en) | 2020-07-31 | 2020-07-31 | Voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213122088U (en) |
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2020
- 2020-07-31 CN CN202021564330.0U patent/CN213122088U/en active Active
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