CN210894486U - Low-voltage alarm circuit - Google Patents
Low-voltage alarm circuit Download PDFInfo
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- CN210894486U CN210894486U CN201921488154.4U CN201921488154U CN210894486U CN 210894486 U CN210894486 U CN 210894486U CN 201921488154 U CN201921488154 U CN 201921488154U CN 210894486 U CN210894486 U CN 210894486U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model is suitable for the technical field of batteries and provides a low-voltage alarm circuit, which comprises a voltage stabilizing circuit, a voltage stabilizing circuit and a voltage regulating circuit, wherein the voltage stabilizing circuit outputs a stable voltage through a voltage stabilizing end of the voltage stabilizing circuit; the alarm switch circuit is connected between the voltage end of the battery and the ground, and is switched on and alarms when the control end receives an alarm voltage signal; when the voltage of the battery is lower than the stable voltage of the voltage stabilizing circuit, the alarm voltage signal is output to the control end of the alarm switch circuit through the comparison signal output end, so that the alarm switch circuit is switched on and alarms. The utility model provides a low-voltage alarm circuit is simple and practical, need not to use the singlechip, need not to write the procedure, can realize the function that the power low-voltage was reported to the police through pure hardware electronic components completely, low cost, the circuit is stable, all can use on any product that needs use the battery.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a low-voltage alarm circuit.
Background
In battery and power supply products, low battery alarms are often required to prompt the user to charge as soon as possible. In the prior art, low-voltage alarm is generally realized by microprocessors such as a single chip microcomputer, and the microprocessors such as the single chip microcomputer judge whether the low-power alarm condition is met or not by reading a battery voltage or electric quantity value.
If the product itself needs other automatic control functions, the microprocessor such as the singlechip can be used as the controller at the same time as the low-voltage alarm, but when the product itself does not need other automatic control functions, the cost is higher if the microprocessor such as the singlechip is only used for low-voltage alarm.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is how to realize the low-voltage alarm of battery for the mode with low cost, need not to use the singlechip, need not to write the procedure, realizes low-voltage alarm through pure hardware components and parts.
In order to solve the technical problem, the utility model discloses a low voltage alarm circuit, which comprises a voltage stabilizing circuit, a voltage stabilizing circuit and a voltage stabilizing circuit, wherein the voltage stabilizing circuit is connected between a battery voltage end of a monitored product and the ground and outputs a stable voltage through a voltage stabilizing end of the voltage stabilizing circuit; the alarm switch circuit is connected between the battery voltage end and the ground, is provided with a control end, and is switched on and alarms when the control end receives an alarm voltage signal; the comparison circuit is simultaneously connected with the voltage end of the battery and the voltage stabilizing end of the voltage stabilizing circuit, and the comparison signal output end of the comparison circuit is connected with the control end of the alarm switch circuit; when the battery voltage is higher than the stable voltage of the voltage stabilizing circuit, the comparison signal output end has no alarm voltage signal output so that the alarm switch circuit is disconnected; when the voltage of the battery is lower than the stable voltage of the voltage stabilizing circuit, an alarm voltage signal is output to the control end of the alarm switch circuit through the comparison signal output end, so that the alarm switch circuit is switched on and alarms.
Further, the voltage stabilizing circuit comprises: a first resistor; and the cathode of the voltage stabilizing diode is used as the voltage stabilizing end and is connected to the battery voltage end through the first resistor, and the anode of the voltage stabilizing diode is grounded.
Furthermore, a filter capacitor is connected in parallel between the cathode and the anode of the voltage stabilizing diode.
Further, the alarm switch circuit includes: a second resistor; the anode of the light-emitting diode is connected with the battery voltage end through the second resistor; the first end of the first switch tube is connected with the cathode of the light emitting diode, the second end of the first switch tube is grounded, the first switch tube is also provided with the control end, and the first end and the second end are switched on when the control end receives the alarm voltage signal, so that the whole alarm switch circuit forms a passage.
Furthermore, the first switch tube is an MOS tube, a first end of the first switch tube is a source electrode, a second end of the first switch tube is a drain electrode, and a control end of the first switch tube is a gate electrode.
Further, the first switch tube is an NPN type triode, a first end of which is a collector, a second end of which is an emitter, and a control end of which is a base.
Further, the second resistor is a resistor with adjustable resistance.
Furthermore, the comparison circuit comprises a second switching tube, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the first end of the second switching tube is connected with the battery voltage end, the second end of the second switching tube is grounded after sequentially passing through the third resistor and the fourth resistor, the connection part of the third resistor and the fourth resistor serves as the comparison signal output end, and the control end of the second switching tube is grounded through the fifth resistor; the first end of the third switching tube is connected with the voltage end of the battery, the second end of the third switching tube is connected with the control end of the second switching tube, and the control end of the third switching tube is connected with the voltage stabilizing end of the voltage stabilizing circuit through the sixth resistor.
Furthermore, the second switch tube is a PNP type triode, the first end of the second switch tube is an emitter, the second end of the second switch tube is a collector, and the control end of the second switch tube is a base.
Furthermore, the third switching tube is a PNP type triode, the first end of the PNP type triode is an emitter, the second end of the PNP type triode is a collector, and the control end of the PNP type triode is a base.
The utility model provides a low-voltage alarm circuit is simple and practical, need not to use the singlechip, need not to write the procedure, can realize the function that the power low-voltage was reported to the police through pure hardware electronic components completely, low cost, the circuit is stable, all can use on any product that needs use the battery.
Drawings
Fig. 1 is a structural diagram of a low voltage alarm circuit according to a first embodiment of the present invention;
fig. 2 is a structural diagram of a low voltage alarm circuit according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a structure of a low voltage alarm circuit according to a first embodiment of the present invention, and referring to fig. 1, the low voltage alarm circuit includes a voltage stabilizing circuit 11, an alarm switch circuit 12, and a comparison circuit 13. The voltage stabilizing circuit 11 is connected between a battery voltage terminal VCC of the monitored product and a ground GND, and has a voltage stabilizing terminal a through which a stabilized voltage V is output. The alarm switch circuit 12 is connected between the battery voltage terminal VCC and the ground GND, and has a control terminal c, and the alarm switch circuit 12 is turned on and gives an alarm when the control terminal c receives an alarm voltage signal. The comparison circuit 13 is connected to the battery voltage terminal VCC and the voltage stabilizing terminal a of the voltage stabilizing circuit 11, and has a comparison signal output terminal b, the comparison signal output terminal b is connected to the control terminal c of the alarm switch circuit 12, and when the battery voltage VCC is higher than the stabilized voltage V of the voltage stabilizing circuit 11, the comparison signal output terminal b has no alarm voltage signal output to disconnect the alarm switch circuit 12; when the battery voltage VCC is lower than the stable voltage V of the voltage stabilizing circuit 11, the alarm voltage signal is output to the control end c of the alarm switch circuit 12 through the comparison signal output end b, so that the alarm switch circuit 12 is turned on and alarms.
In the first embodiment, the alarm switch circuit 12 is controlled to be switched on and alarm only when the battery voltage VCC is lower than the stable voltage V of the voltage stabilizing circuit 11, a single chip microcomputer is not needed, a program is not needed, the function of low-voltage alarm of the power supply can be completely realized through pure hardware electronic components, the cost is low, the circuit is stable, and the alarm switch circuit can be used in any product needing a battery.
In conjunction with the first embodiment, fig. 2 shows the structure of the low voltage alarm circuit provided by the second embodiment of the present invention, please refer to fig. 1 and fig. 2 together, the voltage stabilizing circuit 11 includes a first resistor R1 and a zener diode ZD1, the cathode of the zener diode ZD1 is used as the regulated terminal a and is connected to the battery voltage terminal VCC through the first resistor R1, and the anode of the zener diode ZD1 is grounded. Further, considering that the stabilizing internal resistance of the zener diode ZD1 may cause ripples and noise, a filter capacitor C1 is connected in parallel between the cathode and the anode of the zener diode ZD1, which is helpful for filtering and noise reduction.
With continued reference to fig. 1 and 2, the alarm switch circuit 12 includes a second resistor R2, a light emitting diode LED1, and a first switch Q1, an anode of the light emitting diode LED1 is connected to the battery voltage terminal VCC through the second resistor R2, the first switch Q1 has a first terminal 1, a second terminal 2, and a control terminal 3, the first terminal 1 is connected to a cathode of the light emitting diode LED1, the second terminal 2 is grounded GND, and the first terminal 1 and the second terminal 2 are turned on when the control terminal 3 receives the alarm voltage signal, so that the entire alarm switch circuit 12 forms a circuit.
Specifically, the first switch Q1 may be a MOS transistor, and its first terminal 1 is a source, its second terminal 2 is a drain, and its control terminal 3 is a gate. The first switch Q1 may also be an NPN transistor as shown in fig. 2, wherein the first terminal 1 is a collector, the second terminal 2 is an emitter, and the control terminal 3 is a base.
The second resistor R2 may be a resistor with adjustable resistance. The brightness of the light emitting diode LED1 is adjusted by adjusting the resistance of the second resistor R2.
With continued reference to fig. 1 and 2, the comparison circuit 13 includes a second switching tube Q2, a third switching tube Q3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
The first end 1 of the second switch tube Q2 is connected to the battery voltage terminal VCC, the second end 2 of the second switch tube Q2 is grounded after sequentially passing through the third resistor R3 and the fourth resistor R4, the connection between the third resistor R3 and the fourth resistor R4 serves as the comparison signal output end b, and the control end 3 of the second switch tube Q2 is grounded through the fifth resistor R5.
The first terminal 1 of the third switching tube Q3 is connected to the battery voltage terminal VCC, the second terminal 2 of the third switching tube Q3 is connected to the control terminal 3 of the second switching tube Q2, and the control terminal 3 of the third switching tube Q3 is connected to the voltage stabilizing terminal a of the voltage stabilizing circuit 11 through the sixth resistor R6.
Specifically, the second switch Q2 is a PNP transistor, and its first terminal 1 is an emitter, its second terminal 2 is a collector, and its control terminal 3 is a base. The third switch Q3 is a PNP transistor, the first end 1 of which is an emitter, the second end 2 of which is a collector, and the control end 3 of which is a base.
The low voltage alarm circuit provided by the second embodiment can realize the function that when the voltage of the battery voltage terminal VCC is lower than the stable voltage output by the voltage stabilizing terminal a, the light emitting diode LED1 lights up to alarm, and when the voltage is higher than the stable voltage, the light emitting diode LED1 lights off, and meanwhile, the ultra-low power consumption of the circuit module is maintained.
When the voltage VCC is higher than V, the cathode of the zener diode ZD1 is always kept at the voltage V, the base of the third switch Q3 is also V after passing through the sixth resistor R6, the emitter of the third switch Q3 is VCC, the third switch Q3 is in an on state, the base of the second switch Q2 is connected to VCC, the emitter thereof is also VCC, the second switch Q2 is in an off state, the base of the first switch Q1 is pulled to GND (power supply cathode or ground) by the fourth resistor R4, the first switch Q1 is turned off, the cathode of the LED1 is suspended, and the LED1 is turned off.
When VCC voltage is smaller than V, the voltage stabilizing diode ZD1 does not work, the voltage of the base and the voltage of the emitter of the third switching tube Q3 are VCC, and the third switching tube Q3 is in a cut-off state and does not work; the base of the second switch tube Q2 is pulled to GND (power negative or ground) by the fifth resistor R5, the second switch tube Q2 is turned on, the voltage VCC reaches the base of the first switch tube Q1 after being divided by the third resistor R3 and the fourth resistor R4, the first switch tube Q1 is turned on, the negative electrode of the light emitting diode LED1 is connected to GND, and the light emitting diode LED1 is turned on.
In addition, the polarity of each triode in fig. 2 can be changed to be a high-voltage alarm circuit.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A low voltage alarm circuit, comprising:
the voltage stabilizing circuit is connected between a battery voltage end of a monitored product and the ground, and outputs a stable voltage through a voltage stabilizing end of the voltage stabilizing circuit;
the alarm switch circuit is connected between the battery voltage end and the ground, is provided with a control end, and is switched on and alarms when the control end receives an alarm voltage signal;
the comparison circuit is simultaneously connected with the voltage end of the battery and the voltage stabilizing end of the voltage stabilizing circuit, and the comparison signal output end of the comparison circuit is connected with the control end of the alarm switch circuit; when the battery voltage is higher than the stable voltage of the voltage stabilizing circuit, the comparison signal output end has no alarm voltage signal output so that the alarm switch circuit is disconnected; when the voltage of the battery is lower than the stable voltage of the voltage stabilizing circuit, an alarm voltage signal is output to the control end of the alarm switch circuit through the comparison signal output end, so that the alarm switch circuit is switched on and alarms.
2. The low voltage alarm circuit of claim 1, wherein the voltage regulator circuit comprises:
a first resistor;
and the cathode of the voltage stabilizing diode is used as the voltage stabilizing end and is connected to the battery voltage end through the first resistor, and the anode of the voltage stabilizing diode is grounded.
3. The low voltage alarm circuit of claim 2, wherein a filter capacitor is connected in parallel between the cathode and the anode of the zener diode.
4. The low voltage alarm circuit of claim 1, wherein the alarm switch circuit comprises:
a second resistor;
the anode of the light-emitting diode is connected with the battery voltage end through the second resistor;
the first end of the first switch tube is connected with the cathode of the light emitting diode, the second end of the first switch tube is grounded, the first switch tube is also provided with the control end, and the first end and the second end are switched on when the control end receives the alarm voltage signal, so that the whole alarm switch circuit forms a passage.
5. The low voltage alarm circuit of claim 4, wherein the first switch is a MOS transistor, the first terminal of the first switch is a source, the second terminal of the first switch is a drain, and the control terminal of the first switch is a gate.
6. The low voltage alarm circuit of claim 4, wherein the first switch transistor is an NPN transistor, the first terminal of the NPN transistor is a collector, the second terminal of the NPN transistor is an emitter, and the control terminal of the NPN transistor is a base.
7. A low voltage alarm circuit according to any one of claims 4 to 6 wherein the second resistor is a resistor of adjustable resistance.
8. The low voltage alarm circuit of claim 1, wherein the comparison circuit comprises a second switching tube, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
the first end of the second switching tube is connected with the battery voltage end, the second end of the second switching tube is grounded after sequentially passing through the third resistor and the fourth resistor, the connection part of the third resistor and the fourth resistor serves as the comparison signal output end, and the control end of the second switching tube is grounded through the fifth resistor;
the first end of the third switching tube is connected with the voltage end of the battery, the second end of the third switching tube is connected with the control end of the second switching tube, and the control end of the third switching tube is connected with the voltage stabilizing end of the voltage stabilizing circuit through the sixth resistor.
9. The low voltage alarm circuit of claim 8, wherein the second switch transistor is a PNP transistor having an emitter at a first terminal, a collector at a second terminal, and a base at a control terminal.
10. The low voltage alarm circuit of claim 8, wherein the third switch tube is a PNP transistor having a first end thereof being an emitter, a second end thereof being a collector, and a control end thereof being a base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921488154.4U CN210894486U (en) | 2019-09-06 | 2019-09-06 | Low-voltage alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921488154.4U CN210894486U (en) | 2019-09-06 | 2019-09-06 | Low-voltage alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210894486U true CN210894486U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921488154.4U Active CN210894486U (en) | 2019-09-06 | 2019-09-06 | Low-voltage alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210894486U (en) |
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2019
- 2019-09-06 CN CN201921488154.4U patent/CN210894486U/en active Active
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