CN210380291U - Power supply circuit capable of automatically detecting turn-off - Google Patents
Power supply circuit capable of automatically detecting turn-off Download PDFInfo
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- CN210380291U CN210380291U CN201921256017.8U CN201921256017U CN210380291U CN 210380291 U CN210380291 U CN 210380291U CN 201921256017 U CN201921256017 U CN 201921256017U CN 210380291 U CN210380291 U CN 210380291U
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Abstract
The utility model relates to the technical field of circuits, especially, relate to a supply circuit that automated inspection can turn-off, wherein, include: the input end of the signal detection unit is connected with the output end of the control unit of the electric quantity display; the switch control unit is connected among the signal detection unit, the external battery and a power supply end and comprises a switch module, a control module and a coupling module; the input end of the switch module is connected with the output end of the signal detection unit; the input end of the control module is connected with the output end of the switch module, and the output end of the control module is connected to the anode of the external battery; the coupling module is connected between the output end of the switch module and the grounding end. The technical scheme of the utility model beneficial effect: the coupling module enables the switch module and the control module to be instantly switched on to supply power to the control unit, and when the electric quantity display is not used, the control unit can be switched off, so that an external battery can be effectively protected, and normal work during continuous plugging can be realized.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a power supply circuit that automated inspection can turn-off.
Background
The conventional power supply circuit of the battery power display is used for ensuring that an MCU (micro control unit) and a working circuit normally work when a battery is accessed, the power supply circuit directly gets power from the battery without being switched off, the power display is always in a standby state, and the power supply circuit can consume power of the battery for a long time to cause the overdischarge of the battery and damage the battery.
Therefore, the above problems are difficult problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, a power supply circuit capable of automatically detecting the turn-off state is provided. The specific technical scheme is as follows:
the utility model provides an automatic supply circuit that detects can turn-off for in the power display, supply circuit connects between an external battery, power supply end and earthing terminal, wherein, include:
the input end of the signal detection unit is connected with the output end of the control unit of the electric quantity display;
the switch control unit is connected among the signal detection unit, the external battery and the power supply end and comprises a switch module, a control module and a coupling module;
the input end of the switch module is connected with the output end of the signal detection unit;
the input end of the control module is connected with the output end of the switch module, and the output end of the control module is connected to the anode of the external battery;
the coupling module is connected between the output end of the switch module and the grounding end.
Preferably, the signal detection unit includes:
the control switch signal end is connected with the output end of the control unit of the electric quantity display;
the first resistor is connected to the output end of the control switch signal end;
and the second resistor is connected between the first resistor and the grounding end.
Preferably, the switch module is a first triode, a base of the first triode is connected to the first resistor, and an emitter of the first triode is connected to the ground terminal.
Preferably, the coupling module includes:
the capacitor is connected between the collector of the first triode and the grounding terminal;
and the third resistor is connected between the collector of the first triode and the grounding terminal.
Preferably, the control module includes:
the base electrode of the second triode is connected to the collector electrode of the first triode through a fourth resistor, the collector electrode of the second triode is connected to the power supply end, and the emitting electrode of the second triode is connected to the positive electrode of the external battery;
and the fifth resistor is connected between the emitter of the second triode and the base of the second triode.
Preferably, the power supply circuit further comprises an external power supply terminal, and the external power supply terminal is connected to the emitter of the second triode.
Preferably, the power supply voltage of the external power supply terminal is set to at least 12V.
Preferably, the power supply circuit further includes a touch switch, and the touch switch is connected between the external power supply terminal and the collector of the second triode.
The technical scheme of the utility model beneficial effect lies in: the utility model provides a power supply circuit that automatic detection can turn off, when the electric quantity display standby, utilize switch module and control module among the on-off control unit to cut off input power, make the electric quantity display from the consumption of external battery small, can not make external battery electric quantity lead to the external battery to cross to put the damage by the light consumption, through increasing the coupling module, make switch module and control module switch on instantaneously, the control unit for the electric quantity display supplies power, when not using the electric quantity display, can turn off the control unit, thereby not consuming external battery electric quantity, can effectual protection external battery, can normally work when also realizing continuous plug.
Drawings
Fig. 1 is a power supply circuit diagram according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The utility model provides an automatic supply circuit that detects can turn-off for in the electric quantity display, supply circuit connects between an external battery Batt, power supply end VCC and earthing terminal GND, and wherein, supply circuit includes:
the input end of the signal detection unit 1 is connected with the output end of a control unit (not shown in the figure) of the electric quantity display;
the switch control unit 2 is connected among the signal detection unit 1, the external battery Batt and a power supply end VCC, and the switch control unit 2 comprises a switch module 20, a control module 21 and a coupling module 22;
the input end of the switch module 20 is connected with the output end of the signal detection unit 1;
the input end of the control module 21 is connected with the output end of the switch module 20, and the output end of the control module 21 is connected to the positive electrode of the external battery Batt;
the coupling module 22 is connected between the output terminal of the switch module 20 and the ground terminal GND.
The signal detection unit 1 includes:
a control switch signal terminal 10 connected to the output terminal of the control unit (not shown) of the power display;
a first resistor R1 connected to the output terminal of the control switch signal terminal 10;
a second resistor R2 connected between the first resistor R1 and the ground GND.
The switch module 20 is a first transistor Q1, a base of the first transistor Q1 is connected to the first resistor R1, and an emitter of the first transistor Q1 is connected to the ground GND.
The control module 21 includes:
a second triode Q2, wherein the base of the second triode Q2 is connected to the collector of the first triode Q1 through a fourth resistor R4, the collector of the second triode Q2 is connected to a power supply terminal VCC, and the emitter of the second triode Q2 is connected to the positive pole of an external battery Batt;
a fifth resistor R5 is connected between the emitter of the second transistor Q2 and the base of the second transistor Q2.
With the above-mentioned power supply circuit, as shown in fig. 1, when the power display is connected to the external battery Batt, the power supply circuit is instantly turned on by the coupling module 22 in the switch control unit 2, so that the base of the first transistor Q1 is pulled down, and VCC + is powered, thereby supplying power to the control unit (not shown) of the power display and the whole power supply circuit. It should be noted that the control unit of the power display is an MCU.
Further, when the MCU detects that the input signal is at a low level and is transmitted to the signal terminal 10 of the control switch in the signal detection unit 1, the first transistor Q1 is controlled to be turned on by the first resistor R1, and at this time, the second transistor Q2 in the control module 21 is turned on, so that the positive electrode of the external battery Batt continuously supplies power to the power supply terminal VCC, thereby maintaining the normal operation of the power display.
Further, when the electric quantity display needs to be in a standby state, the MCU detects that the input signal is a high level and sends the high level to the control switch signal end 10 in the signal detection unit 1, so that the first triode Q1 is turned off, the second triode Q2 is turned off, the external battery Batt can not continue to supply power to the MCU and the electric quantity display, and the electric quantity loss of the external battery Batt is reduced.
In a preferred embodiment, the power supply circuit further comprises an external power supply terminal 3, the external power supply terminal 3 being connected to the emitter of the second transistor Q2.
The supply voltage of the external power supply terminal 3 is set to at least 12V.
The power supply circuit further includes a touch switch S connected between the external power source terminal 3 and the collector of the second transistor Q2.
The coupling module 22 includes:
the capacitor C is connected between the collector of the first triode Q1 and the ground end GND;
a third resistor R3 is connected between the collector of the first transistor Q1 and the ground GND.
Specifically, when the above-mentioned electric quantity display that stops working needs to work again, then through pressing touch switch S for outside power supply end 3 switches on power supply end VCC, thereby make power supply end VCC give the MCU power supply, and then MCU sends the low level to control switch signal end 10, makes first triode Q1 and second triode Q2 switch on respectively, thereby maintains power supply end VCC power supply and the continuous normal work of electric quantity display.
Further, the coupling module 22 includes a capacitor C and a third resistor R3, when the power display is taken off from the external battery Batt, the capacitor C cannot be conducted, so that the Q1 is conducted, at this time, the voltage at the two ends of the capacitor C is rapidly discharged through the third resistor R3, so that the capacitor C can be instantly conducted when the capacitor C is connected to the external battery Batt next time, and the power display can be normally operated when being continuously plugged and unplugged.
In addition, the power supply voltage of the external power supply terminal 3 is set to at least 12V.
The technical scheme of the utility model beneficial effect lies in: the utility model provides a power supply circuit that automatic detection can turn off, when the electric quantity display standby, utilize switch module and control module among the on-off control unit to cut off input power, make the electric quantity display from the consumption of external battery small, can not make external battery electric quantity lead to the external battery to cross to put the damage by the light consumption, through increasing the coupling module, make switch module and control module switch on instantaneously, the control unit for the electric quantity display supplies power, when not using the electric quantity display, can turn off the control unit, thereby not consuming external battery electric quantity, can effectual protection external battery, can normally work when also realizing continuous plug.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (8)
1. A kind of automatic detection can turn off the supply circuit, used in the electric quantity display, the said supply circuit connects to an external battery, supplies power between the end and earthing terminal, characterized by that, the said supply circuit includes:
the input end of the signal detection unit is connected with the output end of the control unit of the electric quantity display;
the switch control unit is connected among the signal detection unit, the external battery and the power supply end and comprises a switch module, a control module and a coupling module;
the input end of the switch module is connected with the output end of the signal detection unit;
the input end of the control module is connected with the output end of the switch module, and the output end of the control module is connected to the anode of the external battery;
the coupling module is connected between the output end of the switch module and the grounding end.
2. The power supply circuit of claim 1, wherein the signal detection unit comprises:
the control switch signal end is connected with the output end of the control unit of the electric quantity display;
the first resistor is connected to the output end of the control switch signal end;
and the second resistor is connected between the first resistor and the grounding end.
3. The power supply circuit as claimed in claim 2, wherein the switch module is a first transistor, a base of the first transistor is connected to the first resistor, and an emitter of the first transistor is connected to the ground terminal.
4. A circuit for automatically detecting a power supply that can be turned off according to claim 3, wherein the coupling module comprises:
the capacitor is connected between the collector of the first triode and the grounding terminal;
and the third resistor is connected between the collector of the first triode and the grounding terminal.
5. The power supply circuit of claim 4, wherein the control module comprises:
the base electrode of the second triode is connected to the collector electrode of the first triode through a fourth resistor, the collector electrode of the second triode is connected to the power supply end, and the emitting electrode of the second triode is connected to the positive electrode of the external battery;
and the fifth resistor is connected between the emitter of the second triode and the base of the second triode.
6. A self-test turn-off power supply circuit as claimed in claim 5, further comprising an external power supply terminal connected to the emitter of said second transistor.
7. An automatic shutdown detection power supply circuit as claimed in claim 6, wherein the supply voltage of said external power supply terminal is set to at least 12V.
8. The power supply circuit as claimed in claim 6, further comprising a touch switch connected between the external power source and the collector of the second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921256017.8U CN210380291U (en) | 2019-08-05 | 2019-08-05 | Power supply circuit capable of automatically detecting turn-off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921256017.8U CN210380291U (en) | 2019-08-05 | 2019-08-05 | Power supply circuit capable of automatically detecting turn-off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210380291U true CN210380291U (en) | 2020-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921256017.8U Active CN210380291U (en) | 2019-08-05 | 2019-08-05 | Power supply circuit capable of automatically detecting turn-off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210380291U (en) |
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2019
- 2019-08-05 CN CN201921256017.8U patent/CN210380291U/en active Active
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