CN214755629U - Emergency lamp battery overdischarging protection circuit - Google Patents
Emergency lamp battery overdischarging protection circuit Download PDFInfo
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- CN214755629U CN214755629U CN202120767724.4U CN202120767724U CN214755629U CN 214755629 U CN214755629 U CN 214755629U CN 202120767724 U CN202120767724 U CN 202120767724U CN 214755629 U CN214755629 U CN 214755629U
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Abstract
The utility model provides an emergency lamp battery overdischarge protection circuit. The emergency lamp battery over-discharge protection circuit comprises a diode D1 and a diode D2, wherein the input end of a diode D1 is connected with the input end of a diode D2, the input end of the diode D1 is connected with one end of a resistor R1 and one end of a capacitor C2, the other end of the resistor R1 is connected with the output end of a voltage stabilizing diode DZ1, the other end of the capacitor C2 is connected with the negative electrode of a battery BT1, the output end of the diode D1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the collector of an NPN triode Q1, the base of the NPN triode Q1 is connected with the input end of a voltage stabilizing diode DZ1, and the input end of the voltage stabilizing diode DZ1 is connected with one end of a resistor R2. The utility model provides an emergency light battery overdischarge protection circuit has the advantage that the protection is effectual, the structure is simple relatively to the battery overdischarge.
Description
Technical Field
The utility model relates to a battery protection technical field especially relates to an emergency light battery overdischarge protection circuit.
Background
The battery is a device capable of providing stable voltage and current, plays an important role in various fields in modern society, the emergency lamp is charged by the storage battery when not working, when a normal power supply is cut off, a standby power supply (storage battery) automatically supplies power, and in order to maintain the service life of the battery of the emergency lamp and consider the use safety of the battery of the emergency lamp, the protection of charging and discharging is needed in the use process.
However, the battery over-discharge protection circuit of the emergency lamp in the prior art has an unsatisfactory over-discharge protection effect on the battery, and the structure for realizing the over-discharge protection is complicated, so that the cost is increased.
Therefore, there is a need to provide a new emergency lamp battery over-discharge protection circuit to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide an emergency light battery overdischarge protection circuit effectual, the structure is simple relatively to the battery overdischarge protection.
In order to solve the technical problem, the utility model provides an emergency light battery overdischarge protection circuit includes: the input end of the diode D1 is connected with the input end of the diode D2, the input end of the diode D1 is connected with one end of a resistor R1 and a capacitor C2, the other end of the resistor R1 is connected with the output end of a voltage stabilizing diode DZ1, the other end of the capacitor C2 is connected with the negative electrode of a battery BT1, the output end of the diode D1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector of an NPN triode Q1, the base of the NPN triode Q1 is connected with the input end of the NPN diode DZ1, the input end of the voltage stabilizing diode DZ1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the emitter of the NPN triode Q1, the negative electrode of the battery BT1 is connected with the emitter of an NPN triode Q3, and the emitter of the NPN triode Q1 is connected with the emitter of the NPN triode Q3, the collector of the NPN triode Q1 is connected to the base of the NPN triode Q3, the collector of the NPN triode Q3 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to the base of a PNP triode Q2, and the emitter of the PNP triode Q2 is connected to the output of the diode D2.
Preferably, the negative electrode of the battery BT1 is connected to one end of a resistor R8, and the other end of the resistor R8 is connected to the input end of the diode D1.
Preferably, one end of a fuse F1 is connected to the positive electrode of the battery BT1, and the other end of the fuse F1 is connected to the output end of the diode D2.
Preferably, a base of the NPN transistor Q3 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to an emitter of the NPN transistor Q3.
Preferably, a base of the NPN transistor Q3 is connected to one end of a resistor R7, and the other end of the resistor R7 is connected to an emitter of the NPN transistor Q3.
Preferably, the emitter of the PNP transistor Q2 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to the base of the PNP transistor Q2.
Preferably, the collector of the PNP transistor Q2 is connected to one end of a resistor R5, and the other end of the resistor R5 is connected to the base of the NPN transistor Q3.
Compared with the prior art, the utility model provides an emergency light battery overdischarging protection circuit has following beneficial effect:
the utility model provides an emergency light battery overdischarging protection circuit, when battery voltage is less than the overdischarging protection point, NPN triode Q3 ends, further make PNP triode Q2 end, end the battery discharge, after discharging, under the input lasts the condition of no voltage, NPN triode Q3 can't get into the on-state once more, whole circuit gets into the overdischarging protection state, overdischarging the protection reliably just effectual to the battery, the design that corresponds is also comparatively simple, be favorable to practicing thrift the cost.
Drawings
Fig. 1 is a circuit diagram of a preferred embodiment of the battery overdischarge protection circuit for an emergency light provided by the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
Referring to fig. 1, fig. 1 is a circuit diagram of a preferred embodiment of an emergency light battery over-discharge protection circuit according to the present invention. The emergency lamp battery overdischarge protection circuit comprises: the input end of the diode D1 is connected with the input end of the diode D2, the input end of the diode D1 is connected with one end of a resistor R1 and a capacitor C2, the other end of the resistor R1 is connected with the output end of a voltage stabilizing diode DZ1, the other end of the capacitor C2 is connected with the negative electrode of a battery BT1, the output end of the diode D1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector of an NPN triode Q1, the base of the NPN triode Q1 is connected with the input end of the NPN diode DZ1, the input end of the voltage stabilizing diode DZ1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the emitter of the NPN triode Q1, the negative electrode of the battery BT1 is connected with the emitter of an NPN triode Q3, and the emitter of the NPN triode Q1 is connected with the emitter of the NPN triode Q3, the collector of the NPN triode Q1 is connected to the base of the NPN triode Q3, the collector of the NPN triode Q3 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to the base of a PNP triode Q2, and the emitter of the PNP triode Q2 is connected to the output of the diode D2.
The negative electrode of the battery BT1 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the input end of the diode D1.
The positive electrode of the battery BT1 is connected with one end of a fuse F1, and the other end of the fuse F1 is connected with the output end of the diode D2.
The base of the NPN triode Q3 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to the emitter of the NPN triode Q3.
The base of the NPN triode Q3 is connected with one end of a resistor R7, and the other end of the resistor R7 is connected with the emitter of the NPN triode Q3.
The emitter of the PNP triode Q2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the base of the PNP triode Q2.
The collector of the PNP triode Q2 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the base of the NPN triode Q3.
The utility model provides an emergency light battery overdischarge protection circuit's theory of operation as follows:
charging a battery BT1 when an input voltage exists, and conducting and pulling down the base voltage of an NPN triode Q3 through an NPN triode Q1 to enable the NPN triode Q3 to be in a cut-off state, so that the base of the PNP triode Q2 enters a high level, the PNP triode Q2 cannot be conducted, and the battery cannot enter a discharging state;
when the input is switched from power-on to power-off, the NPN triode Q1 is firstly cut off, the NPN triode Q3 is conducted, the base voltage of the PNP triode Q2 is pulled down, the PNP triode Q2 is conducted, and therefore the battery starts to supply power to the output;
the voltage is gradually reduced when the battery is discharged, voltage division is carried out through the resistor R5 and the resistor R7, when the voltage of the battery is lower than an over-discharge protection point, the base voltage of the NPN triode Q3 is lower than the conducting voltage, so that the NPN triode Q3 is cut off, the PNP triode Q2 is further cut off, and the battery discharge is finished;
and fourthly, after the discharge of the battery is finished, the battery enters an idle state, the voltage of the battery floats high, if the input end continuously has no voltage, the NPN triode Q3 cannot enter a conducting state again, and the whole circuit enters an over-discharge protection state.
Compared with the prior art, the utility model provides an emergency light battery overdischarging protection circuit has following beneficial effect:
the utility model provides an emergency light battery overdischarging protection circuit, when battery voltage is less than the overdischarging protection point, NPN triode Q3 ends, further make PNP triode Q2 end, end the battery discharge, after discharging, under the input lasts the condition of no voltage, NPN triode Q3 can't get into the on-state once more, whole circuit gets into the overdischarging protection state, overdischarging the protection reliably just effectual to the battery, the design that corresponds is also comparatively simple, be favorable to practicing thrift the cost.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.
Claims (7)
1. An emergency lamp battery overdischarge protection circuit comprises a diode D1 and a diode D2, and is characterized in that an input end of the diode D1 is connected with an input end of the diode D2, an input end of the diode D1 is connected with one ends of a resistor R1 and a capacitor C2, the other end of the resistor R1 is connected with an output end of a voltage stabilizing diode DZ1, the other end of the capacitor C2 is connected with a negative electrode of a battery BT1, an output end of the diode D1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a collector of an NPN triode Q1, a base of the NPN triode Q1 is connected with an input end of the voltage stabilizing diode DZ1, an input end of the voltage stabilizing diode DZ1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with an emitter of the NPN triode Q1, a negative electrode of the battery BT1 is connected with an emitter of an NPN triode Q3, an emitter of the NPN triode Q1 is connected to an emitter of the NPN triode Q3, a collector of the NPN triode Q1 is connected to a base of the NPN triode Q3, a collector of the NPN triode Q3 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to a base of a PNP triode Q2, and an emitter of the PNP triode Q2 is connected to an output end of the diode D2.
2. The emergency lamp battery overdischarge protection circuit according to claim 1, wherein the negative pole of the battery BT1 is connected to one end of a resistor R8, and the other end of the resistor R8 is connected to the input end of the diode D1.
3. The emergency lamp battery overdischarge protection circuit according to claim 1, wherein one end of a fuse F1 is connected to the positive electrode of the battery BT1, and the other end of the fuse F1 is connected to the output end of the diode D2.
4. The emergency lamp battery overdischarge protection circuit according to claim 1, wherein a base of the NPN transistor Q3 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is connected to an emitter of the NPN transistor Q3.
5. The emergency lamp battery overdischarge protection circuit according to claim 4, wherein a base of the NPN transistor Q3 is connected to one end of a resistor R7, and the other end of the resistor R7 is connected to an emitter of the NPN transistor Q3.
6. The emergency lamp battery overdischarge protection circuit according to claim 1, wherein the emitter of the PNP transistor Q2 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to the base of the PNP transistor Q2.
7. The emergency lamp battery overdischarge protection circuit according to claim 1, wherein the collector of the PNP transistor Q2 is connected to one end of a resistor R5, and the other end of the resistor R5 is connected to the base of the NPN transistor Q3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120767724.4U CN214755629U (en) | 2021-04-15 | 2021-04-15 | Emergency lamp battery overdischarging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120767724.4U CN214755629U (en) | 2021-04-15 | 2021-04-15 | Emergency lamp battery overdischarging protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214755629U true CN214755629U (en) | 2021-11-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120767724.4U Active CN214755629U (en) | 2021-04-15 | 2021-04-15 | Emergency lamp battery overdischarging protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214755629U (en) |
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2021
- 2021-04-15 CN CN202120767724.4U patent/CN214755629U/en active Active
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