CN214626491U - Battery self-comparison turn-off circuit - Google Patents
Battery self-comparison turn-off circuit Download PDFInfo
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- CN214626491U CN214626491U CN202120292920.0U CN202120292920U CN214626491U CN 214626491 U CN214626491 U CN 214626491U CN 202120292920 U CN202120292920 U CN 202120292920U CN 214626491 U CN214626491 U CN 214626491U
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Abstract
The utility model relates to a battery self-comparison turn-off circuit, which comprises a main power supply, a standby battery, a power switch circuit, a power switching circuit, a load, a comparison control circuit and a standby battery protection circuit; the power supply switching circuit is connected with a main power supply and a load, and the main power supply supplies power to the load through the power supply switching circuit; the power supply switching circuit is connected with the standby battery and the power supply switching circuit, and the standby battery supplies power to the load through the power supply switching circuit and the power supply switching circuit; the power supply switching circuit switches a main power supply or a standby battery to supply power to the load; the comparison control circuit is connected with the power switch circuit and controls the power switch circuit to be turned off or turned on. The utility model discloses a battery self-comparison turn-off circuit, which prevents the main power supply from reversely filling the voltage of the standby battery through the power switch circuit when the main power supply is powered through the comparison control circuit, and automatically turns off when the standby battery is under-voltage to protect the standby battery; the circuit is completely composed of hardware circuit components, and has high reliability and good stability.
Description
Technical Field
The utility model relates to a power supply field, concretely relates to battery is from comparison turn-off circuit.
Background
At present, a plurality of devices are powered by double power supplies, including a main power supply and a standby power supply, wherein the standby power supply is powered by a battery, once the main power supply cannot supply power, the standby battery is immediately switched to supply power, and when the main power supply is recovered to be normal, the main power supply is used for supplying power again. Most of the existing battery power supply circuits do not have a turn-off function, batteries supply power for a long time, and the loss of the batteries is large, so that part of the battery power supply circuits realize the turn-off function through a single chip microcomputer, the resources of the single chip microcomputer are occupied, and meanwhile, the complexity of programs is improved.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a battery is from comparison turn-off circuit, this circuit comprises electron device completely, does not need singlechip and program control, and the consumption is little, and security and stability are high, realizes the protection to the battery through this circuit, the utility model discloses a technical purpose is realized through following technical scheme:
a battery self-comparison turn-off circuit comprises a main power supply, a standby battery, a power supply switch circuit, a power supply switching circuit, a load, a comparison control circuit and a standby battery protection circuit; the power supply switching circuit is connected with a main power supply and a load, and the main power supply supplies power to the load through the power supply switching circuit; the power supply switching circuit is connected with the standby battery and the power supply switching circuit, and the standby battery supplies power to the load through the power supply switching circuit and the power supply switching circuit; the power supply switching circuit switches a main power supply or a standby battery to supply power to the load; the comparison control circuit is connected with the power switch circuit and controls the power switch circuit to be turned off or turned on; the standby battery protection circuit is connected with the power switch and controls the power switch circuit to be turned off or turned on.
Furthermore, the comparison control circuit comprises a comparison circuit, a main power supply voltage division circuit and a voltage reference circuit B, wherein the main power supply voltage division circuit and the voltage reference circuit B are respectively connected with the comparison circuit, and the comparison circuit is connected with the power supply switch circuit; the comparison circuit controls the power switch circuit to be turned on or turned off by comparing the voltage of the main power dividing circuit with the voltage of the voltage reference circuit B.
Further, the battery self-comparison turn-off circuit further comprises a standby battery protection circuit, and the standby battery protection circuit is connected with the power switch circuit.
Furthermore, the backup battery protection circuit comprises a hysteresis comparison circuit, a battery bleeder circuit and a voltage reference circuit A, wherein the battery bleeder circuit and the voltage reference circuit A are respectively connected with the hysteresis comparison circuit, the hysteresis comparison circuit is connected with the power switch circuit, and the hysteresis comparison circuit compares the voltage of the battery bleeder circuit with the voltage of the voltage reference circuit A to control the power switch circuit to be turned on or turned off.
Further, the reference circuit A comprises a first voltage reference circuit and a second voltage reference circuit; the voltage of the first voltage reference circuit is smaller than that of the second voltage reference circuit, and the voltage of the second voltage reference circuit is smaller than the initial voltage of the battery voltage division circuit.
Further, the power switch circuit is a P-type MOSFET switch.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. through the battery self-turn-off circuit, when the voltage of the battery is reduced to be lower than the voltage of the battery reference voltage circuit I, the power switch circuit is turned off, so that the standby battery is prevented from being powered under low voltage, and the standby battery is protected;
2. the comparison control circuit prevents the main power supply from reversely flowing the voltage of the standby battery through the power supply switch circuit when the main power supply supplies power;
3. the utility model discloses a battery is from the shutdown circuit completely by the hardware circuit component, and the reliability is higher, and stability is good.
Drawings
Fig. 1 is a schematic diagram of a self-comparison turn-off circuit structure of a battery according to the present invention.
In the figure, 1, main power supply; 2. a power switching circuit; 3. a MOSFET switch; 4. a backup battery; 5. a load; 6. a comparison circuit; 7. a main power supply voltage dividing circuit; 8. a voltage reference B circuit; 9. a hysteresis comparison circuit; 10. a battery voltage divider circuit; 11. voltage reference a circuit.
Detailed Description
The technical solution of the present invention is further described below with reference to the following embodiments:
a battery self-comparison turn-off circuit is shown in figure 1, and comprises a main power supply 1, a standby battery 4, a power supply switch circuit, a power supply switching circuit 2, a load 5 and a comparison control circuit, wherein the power supply switch circuit is a P-type MOSFET switch 3(PMOS), the power supply switching circuit 2 is connected with the main power supply 1 and the load 5, and the main power supply 1 supplies power to the load 5 through the power supply switching circuit 2; the power supply switch circuit is connected with the standby battery 4 and the power supply switching circuit 2, and the standby battery 4 supplies power to the load 5 through the power supply switch circuit and the power supply switching circuit 2; the power supply switching circuit 2 switches the main power supply 1 or the backup battery 4 to supply power to the load 5, the power supply switching circuit 2 is used for switching the main power supply 1 and the backup battery 4, and the power supply switching circuit 2 is switched to the backup battery 4 to supply power to the load 5 when the main power supply 1 is powered off or is in power shortage; the comparison control circuit is connected with the power switch circuit and controls the power switch circuit to be turned off or turned on.
Specifically, the comparison control circuit comprises a comparison circuit 6, a main power supply voltage division circuit 7 and a voltage reference circuit B8, wherein the main power supply voltage division circuit 7 and the voltage reference circuit B8 are respectively connected with the comparison circuit 6, and the comparison circuit 6 is connected with the power supply switch circuit; the comparison circuit 6 controls the power switch circuit to be turned on or off by comparing the voltage of the main power supply voltage division circuit 7 with the voltage of the voltage reference circuit B8; when the voltage of the main power supply voltage division circuit 7 is equal to the voltage of the main power supply 1, and the voltage of the main power supply voltage division circuit 7 is greater than the voltage of the voltage reference circuit B8, which indicates that the main power supply 1 supplies power to the load 5, the comparison circuit controls the power supply switch circuit to be switched off, so that the voltage is prevented from flowing back to the backup battery 4 when the main power supply 1 supplies power to the load 5; when the voltage of the main power supply voltage division circuit 7 is less than the voltage of the voltage reference circuit B8, which indicates that the main power supply 1 is powered off or under-powered, the power supply switching circuit 2 is switched to the standby battery 4 to supply power, and the comparison circuit 6 controls the power supply switch circuit to be turned on, so as to ensure that the standby battery 4 supplies power to the load 5.
Because the voltage of the backup battery 4 is reduced after the backup battery 4 supplies power for a period of time, the voltage of the backup battery 4 is gradually smaller than the initial voltage, if the backup battery 4 is always in an underpower power supply state, the loss of the backup battery 4 is large, and the service life of the backup battery 4 is shortened; therefore, a backup battery protection circuit is added, the backup battery protection circuit is connected with the power supply switch circuit, when the backup battery 4 supplies power, once the voltage of the backup battery 4 is lower than a set value, the power supply switch circuit is turned off, and the backup battery 4 stops supplying power to the load.
Specifically, the backup battery protection circuit comprises a hysteresis comparison circuit 9, a battery voltage division circuit 10 and a voltage reference circuit A11, wherein the voltage of the battery voltage division circuit 10 is equal to the voltage of the backup battery 4, the battery voltage division circuit 10 and the voltage reference circuit A11 are respectively connected with the hysteresis comparison circuit 9, the hysteresis comparison circuit 9 is connected with a power switch circuit, and the hysteresis comparison circuit 9 compares the voltage of the battery voltage division circuit 10 with the voltage of the voltage reference circuit A11 to control the power switch circuit to be turned on or turned off;
the voltage reference circuit A11 comprises a first voltage reference circuit and a second voltage reference circuit; the voltage of the first voltage reference circuit is smaller than that of the second voltage reference circuit, and the voltage of the second voltage reference circuit is smaller than the initial voltage of the battery voltage division circuit 10. When the voltage of the battery voltage division circuit 10 is lower than the voltage of the first voltage reference circuit, the hysteresis comparison circuit 9 controls the power switch circuit to be turned off, the standby battery 4 stops supplying power to the load 5, the voltage of the standby battery 4 rises again after the load 5 disappears, if the voltage of the standby battery 4 rises back to be higher than the voltage of the first voltage reference circuit, the hysteresis comparison circuit 9 is turned on again, and the standby battery 4 supplies power to the load 5 again; therefore, a second voltage reference circuit is added, and if the voltage of the standby battery 4 rises back to the voltage of the first voltage reference circuit but is still lower than the voltage of the second voltage reference circuit, the power switch circuit is still in an off state; the backup battery 4 will not re-power the load 5 unless the voltage of the backup battery 4 can rise back to exceed the voltage of the voltage reference circuit two.
The present embodiment is only for further explanation of the present invention, and is not a limitation of the present invention, and those skilled in the art can make various inventive modifications to the present embodiment as needed after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (6)
1. A battery self-comparison turn-off circuit is characterized by comprising a main power supply, a standby battery, a power supply switch circuit, a power supply switching circuit, a load, a comparison control circuit and a standby battery protection circuit; the power supply switching circuit is connected with a main power supply and a load, and the main power supply supplies power to the load through the power supply switching circuit; the power supply switching circuit is connected with the standby battery and the power supply switching circuit, and the standby battery supplies power to the load through the power supply switching circuit and the power supply switching circuit; the power supply switching circuit switches a main power supply or a standby battery to supply power to the load; the comparison control circuit is connected with the power switch circuit and controls the power switch circuit to be turned off or turned on; the standby battery protection circuit is connected with the power switch and controls the power switch circuit to be turned off or turned on.
2. The battery self-comparison turn-off circuit as claimed in claim 1, wherein the comparison control circuit comprises a comparison circuit, a main power voltage division circuit and a voltage reference circuit B, the main power voltage division circuit and the voltage reference circuit B are respectively connected with the comparison circuit, and the comparison circuit is connected with the power switch circuit; the comparison circuit controls the power switch circuit to be turned on or turned off by comparing the voltage of the main power voltage division circuit with the voltage of the voltage reference circuit B.
3. The battery self-comparison shutdown circuit of claim 2, further comprising a backup battery protection circuit, the backup battery protection circuit being connected to the power switch circuit.
4. The battery self-comparison turn-off circuit as claimed in claim 1, wherein the backup battery protection circuit comprises a hysteresis comparison circuit, a battery voltage division circuit and a voltage reference circuit a, the battery voltage division circuit and the voltage reference circuit a are respectively connected to the hysteresis comparison circuit, the hysteresis comparison circuit is connected to the power switch circuit, and the hysteresis comparison circuit compares the voltage of the battery voltage division circuit with the voltage of the voltage reference circuit a to control the power switch circuit to be turned on or turned off.
5. The battery self-comparison turn-off circuit as claimed in claim 4, wherein the voltage reference circuit A comprises a first voltage reference circuit and a second voltage reference circuit; the voltage of the first voltage reference circuit is smaller than that of the second voltage reference circuit, and the voltage of the second voltage reference circuit is smaller than the initial voltage of the battery voltage division circuit.
6. The battery self-comparison turn-off circuit as claimed in any one of claims 1 to 5, wherein the power switch circuit is a P-type MOSFET switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120292920.0U CN214626491U (en) | 2021-02-02 | 2021-02-02 | Battery self-comparison turn-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120292920.0U CN214626491U (en) | 2021-02-02 | 2021-02-02 | Battery self-comparison turn-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214626491U true CN214626491U (en) | 2021-11-05 |
Family
ID=78439526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120292920.0U Active CN214626491U (en) | 2021-02-02 | 2021-02-02 | Battery self-comparison turn-off circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214626491U (en) |
-
2021
- 2021-02-02 CN CN202120292920.0U patent/CN214626491U/en active Active
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