CN208076614U - NTC detections on power supply and safety certification circuit - Google Patents
NTC detections on power supply and safety certification circuit Download PDFInfo
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- CN208076614U CN208076614U CN201820520807.1U CN201820520807U CN208076614U CN 208076614 U CN208076614 U CN 208076614U CN 201820520807 U CN201820520807 U CN 201820520807U CN 208076614 U CN208076614 U CN 208076614U
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- resistance
- triode
- resistor
- transistor
- power supply
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Abstract
The utility model discloses on a kind of power supply NTC detection and safety certification circuit, it includes first resistor, second resistance, 3rd resistor, 4th resistance, 5th resistance, 6th resistance, 8th resistance, 9th resistance, amplifier, first triode, second triode, third transistor, 4th triode, first diode, second diode, control chip, relay coil, thermistor, first resistor and second resistance series connection, the base stage of first triode is connected with first resistor and second resistance, 3rd resistor is in parallel with first resistor and second resistance, the collector of first triode is connected with one end of the 5th resistance.The utility model is simple in structure, safe and convenient to use, high sensitivity.
Description
Technical field
The utility model is related to a kind of circuit, more particularly on a kind of power supply NTC detections and safety certification circuit.
Background technology
After common NTC detectings circuit is usually two electric resistance partial pressures at present, voltage value is detected with MCU, to reach detecting NTC
The purpose of resistance value, it is inconvenient to use, the utility model patent by detect NTC whether line attachment, be used as whether give battery
The necessary condition of charging, as long as port voltage can be detected, can open relay to battery even if battery is in a dormant state
Charging.
Invention content
The technical problem to be solved by the utility model is to provide on a kind of power supply NTC detection and safety certification circuit,
Its is simple in structure, safe and convenient to use, high sensitivity.
The utility model is to solve above-mentioned technical problem by following technical proposals：A kind of NTC detections on power supply
And safety certification circuit comprising first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance,
Eight resistance, the 9th resistance, amplifier, the first triode, the second triode, third transistor, the 4th triode, the one or two pole
Pipe, the second diode, control chip, relay coil, thermistor, first resistor and second resistance series connection, the first triode
Base stage be connected with first resistor and second resistance, 3rd resistor is in parallel with first resistor and second resistance, the first triode
Collector is connected with one end of the 5th resistance, and the other end of the 5th resistance is connected with the base stage of the second triode, the second triode
Emitter ground connection, the collector of the second triode is connected with the 4th resistance, the 4th resistance and the second Diode series, the two or two
Pole pipe and the first Diode series, relay coil and the 4th resistance and the second diodes in parallel, relay coil and the three or three
The collector of pole pipe is connected, and the emitter of third transistor connects power supply, one end phase of the base stage of third transistor and the 6th resistance
Even and the base stage of third transistor is connected with the collector of the 4th triode, the emitter ground connection of the 4th triode, the four or three pole
Be connected with the output end of the amplifier electrode input end of third transistor of the base stage of pipe is connected with the 8th resistance and the 9th resistance, puts
The negative input of big device is connected with reference voltage, and thermistor is connected with second resistance and thermistor one end is grounded, temperature-sensitive
The resistance other end is connected with control chip.
Preferably, the both ends of the 7th resistance are connected to form with the output end of amplifier and electrode input end positive and negative respectively
Current feed circuit.
Preferably, the relay coil is connected with a relay.
Preferably, first triode and third transistor are all PNP type triodes.
Preferably, second triode and the 4th triode are NPN type triodes.
The positive effect of the utility model is：The utility model is simple in structure, safe and convenient to use, sensitivity
It is high.
Description of the drawings
Fig. 1 is the principles of the present invention figure.
Specific implementation mode
The utility model preferred embodiment is provided below in conjunction with the accompanying drawings, the technical solution of the utility model is described in detail.
NTC detections and safety certification circuit on the utility model power supply as shown in Figure 1 include first resistor R1, the second electricity
Hinder R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 8th resistance R8, the 9th resistance R9, amplifier
U1, the first triode Q1, the second triode Q2, third transistor Q3, the 4th triode Q4, the first diode D1, the two or two pole
Pipe D2, control chip MCU, relay coil K1, thermistor NTC, first resistor R1 and second resistance R2 series connection, the one or three pole
The base stage of pipe Q1 is connected with first resistor R1 and second resistance R2, and 3rd resistor R3 and first resistor R1 and second resistance R2 is simultaneously
Connection, the collector of the first triode Q1 are connected with one end of the 5th resistance R5, the other end and the second triode of the 5th resistance R5
The base stage of Q2 is connected, and the emitter ground connection of the second triode Q2, the collector of the second triode Q2 is connected with the 4th resistance R4, the
Four resistance R4 connect with the second diode D2, the second diode D2 and the first diode D1 series connection, relay coil K1 and the 4th
Resistance R4 and the second diode D2 are in parallel, and relay coil K1 is connected with the collector of third transistor Q3, third transistor Q3
Emitter connect power supply, the base stage of third transistor Q3 be connected with one end of the 6th resistance R6 and the base stage of third transistor Q3 with
The collector of 4th triode Q4 is connected, the emitter ground connection of the 4th triode Q4, the base stage and amplifier of the 4th triode Q4
The electrode input end of the connected third transistor Q3 of the output end of U1 is connected with the 8th resistance R8 and the 9th resistance R9, amplifier U1's
Negative input is connected with reference voltage, and thermistor NTC connects with second resistance R2 and the one end thermistor NTC is grounded, heat
The quick resistance NTC other ends are connected with control chip MCU.
The both ends of 7th resistance are connected to form positive-feedback circuit with the output end of amplifier and electrode input end respectively,
Aggravate the variation of output signal.
The relay coil is connected with a relay, and when relay coil is powered, relay is attracted.
First triode and third transistor are all PNP type triodes, when there is signal triggering, signal output end and
Power cord VCC connections are equivalent to the power cord of output high level.
Second triode and the 4th triode are NPN type triodes, and when there is signal triggering, signal output end goes out low
Level.
Utility model works principle is as follows：The resistance value of adjustable 8th resistance and the 9th resistance, to determine amplifier
Export the voltage of high level, so that the 4th triode ON, the first triode ON after thermistor is inserted into open simultaneously
Second triode so that relay coil is connected, and relay is attracted, and raising is safe to use, and charger starts to charge up, with control core
Piece detect voltage value, come achieve the purpose that detect thermistor resistance value, by detect thermistor whether line attachment, be used as
The necessary condition whether to charge the battery, it is simple in structure easy to use in this way, even if battery is in a dormant state, as long as can detect
To port voltage, relay can be opened and charged the battery, the second triode and the 4th triode are NPN type triodes, when having
When signal triggers, signal output end goes out low level, and the first triode and third transistor are PNP type triodes, is touched when there is signal
When hair, signal output end is connected with power cord VCC, is equivalent to the power cord of output high level, the both ends of the 7th resistance respectively with
The output end and electrode input end of amplifier are connected to form positive-feedback circuit, aggravate the variation of output signal, improve sensitivity.
In conclusion the utility model is simple in structure, safe and convenient to use, high sensitivity.
Particular embodiments described above, the technical issues of to the solution of the utility model, technical solution and advantageous effect
It has been further described, it should be understood that the foregoing is merely specific embodiment of the utility model, not
For limiting the utility model, within the spirit and principle of the utility model, any modification for being made, changes equivalent replacement
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. the NTC detections on a kind of power supply and safety certification circuit, which is characterized in that it includes first resistor, second resistance, the
Three resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 8th resistance, the 9th resistance, amplifier, the first triode, the two or three
Pole pipe, third transistor, the 4th triode, the first diode, the second diode, control chip, relay coil, temperature-sensitive electricity
Resistance, first resistor and second resistance series connection, the base stage of the first triode is connected with first resistor and second resistance, 3rd resistor and
First resistor and second resistance are in parallel, and the collector of the first triode is connected with one end of the 5th resistance, the 5th resistance it is another
End is connected with the base stage of the second triode, the emitter ground connection of the second triode, the collector of the second triode and the 4th resistance
It is connected, the 4th resistance and the second Diode series, the second diode and the first Diode series, relay coil and the 4th resistance
With the second diodes in parallel, relay coil is connected with the collector of third transistor, and the emitter of third transistor connects power supply,
The base stage of third transistor is connected with one end of the 6th resistance and the collector phase of the base stage of third transistor and the 4th triode
Even, the emitter ground connection of the 4th triode, the base stage of the 4th triode are being connected third transistor just with the output end of amplifier
Pole input terminal is connected with the 8th resistance and the 9th resistance, and the negative input of amplifier is connected with reference voltage, thermistor with
Second resistance is connected and thermistor one end is grounded, and the thermistor other end is connected with control chip.
2. the NTC detections on power supply as described in claim 1 and safety certification circuit, which is characterized in that the relay line
Circle is connected with a relay.
3. the NTC detections on power supply as described in claim 1 and safety certification circuit, which is characterized in that the one or three pole
Pipe and third transistor are all PNP type triodes.
4. the NTC detections on power supply as described in claim 1 and safety certification circuit, which is characterized in that the two or three pole
Tetra- triodes of Guan Yu are all NPN type triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820520807.1U CN208076614U (en) | 2018-04-13 | 2018-04-13 | NTC detections on power supply and safety certification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820520807.1U CN208076614U (en) | 2018-04-13 | 2018-04-13 | NTC detections on power supply and safety certification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208076614U true CN208076614U (en) | 2018-11-09 |
Family
ID=64040973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820520807.1U Active CN208076614U (en) | 2018-04-13 | 2018-04-13 | NTC detections on power supply and safety certification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208076614U (en) |
-
2018
- 2018-04-13 CN CN201820520807.1U patent/CN208076614U/en active Active
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