CN215990213U - Self-locking power supply switching circuit - Google Patents
Self-locking power supply switching circuit Download PDFInfo
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- CN215990213U CN215990213U CN202122108413.XU CN202122108413U CN215990213U CN 215990213 U CN215990213 U CN 215990213U CN 202122108413 U CN202122108413 U CN 202122108413U CN 215990213 U CN215990213 U CN 215990213U
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Abstract
The utility model provides a self-locking power switching circuit, comprising: the system comprises a diode half-bridge, an airborne battery, a starting loop and a self-locking loop; one anode end of the diode half bridge is electrically connected with the output end of an external power supply, and the cathode end of the diode half bridge is electrically connected with the power supply end of the electric equipment; a starting loop and a self-locking loop are connected between the anode and the cathode of the airborne battery in parallel, an NPN triode is connected to the starting loop, and a collector and an emission set of the NPN triode are respectively connected to the anode and the cathode of the airborne battery; a P-channel enhanced MOSFET is connected to the self-locking loop, and the source electrode and the drain electrode of the P-channel enhanced MOSFET are respectively and electrically connected with the anode of the airborne battery and the other anode end of the diode half bridge; the base electrode of the NPN triode is connected to the self-locking loop through a lead, the base electrode of the NPN triode is simultaneously connected with a battery on-off control circuit, and the grid electrode of the P-channel enhanced MOSFET is connected to the starting loop through the lead.
Description
Technical Field
The utility model belongs to the technical field of electronics and electric appliances, and particularly relates to a self-locking power supply switching circuit.
Background
When some specific electric equipment starts to enter into preparation for work, an external power supply supplies power to the specific electric equipment, after the electric equipment receives a work starting command from other external equipment (such as a weapon launching system and the like), the electric equipment needs to be switched to supply power to a battery of the electric equipment, assembly or routine test check needs to be carried out before the electric equipment actually starts to work, and in the period, the battery of the electric equipment is always in an on state, so that the early consumption of the self-contained battery of the electric equipment is caused, and the standby time before the electric equipment works is too short.
SUMMERY OF THE UTILITY MODEL
The present invention proposes a self-locking power switching circuit for overcoming the above-mentioned problems or at least partially solving or alleviating the above-mentioned problems.
A self-locking power switching circuit, comprising:
a diode half-bridge D1, wherein one anode terminal of the diode half-bridge D1 is electrically connected with the output terminal of an external power supply E2, and the cathode terminal of the diode half-bridge D1 is electrically connected with the power supply terminal of the electric equipment Y;
the self-locking control circuit comprises an onboard battery E1, wherein a starting loop and a self-locking loop are connected in parallel between the anode and the cathode of the onboard battery E1, an NPN triode Q1 is connected to the starting loop from the anode to the cathode of the onboard battery E1, the collector of the NPN triode Q1 is connected to the anode of the onboard battery E1, and the emitter of the NPN triode Q1 is connected to the cathode of the onboard battery E1; a P-channel enhancement type MOSFET Q2 is connected between the anode and the cathode of the airborne battery E1 on the self-locking loop, the source electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the anode of the airborne battery E1, and the drain electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the other anode end of the diode half bridge D1;
the base electrode of the NPN triode Q1 is connected to the self-locking loop, the base electrode of the NPN triode Q1 is simultaneously connected with a battery on-off control circuit, and the grid electrode of the P-channel enhancement type MOSFET Q2 is connected to the starting loop.
The self-locking power switching circuit of the utility model also has the following optional features.
Optionally, the battery on-off control circuit is sequentially connected with a command transmitter N, a capacitor C1 and a resistor R1, and the resistor R1 is electrically connected with a base of the NPN triode Q1.
Optionally, an on-off safety switch K2 is further connected between the command transmitter N and the capacitor C1.
Optionally, the self-locking loop is further connected with a resistor R5 and a resistor R2, one end of the resistor R5 and one end of the resistor R2 are electrically connected with a base of the NPN triode Q1, the other end of the resistor R5 is electrically connected with a drain of the P-channel enhancement MOSFET Q2, and the other end of the resistor R2 is connected with a cathode of the onboard battery E1.
Optionally, the resistance of the resistor R5 is much larger than the resistance of the resistor R2.
Optionally, a resistor R3 and a resistor R4 are further connected to the start-up circuit, one end of the resistor R3 is connected to the positive electrode of the onboard battery E1, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the collector of the NPN transistor Q1.
Optionally, the gate of the P-channel enhancement MOSFET Q2 is connected between the resistor R3 and the resistor R4 on the start-up loop.
The self-locking power supply switching circuit can switch power supply of external equipment and power supply of the battery back and forth, and the onboard battery of the electric equipment can be in a power supply cut-off state before the onboard battery of the electric equipment starts to supply power and actually starts to work, so that the loss of the onboard battery can be reduced to the maximum extent, and the standby time of the electric equipment can be prolonged.
Drawings
FIG. 1 is a circuit diagram of the present invention in an externally powered state;
FIG. 2 is a circuit diagram of the present invention when connected to an onboard battery for power;
FIG. 3 is a circuit diagram of the present invention in the off external power state;
fig. 4 is a circuit diagram of the present invention when the on-board battery is disconnected.
Detailed Description
Example 1
Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a self-locking power switching circuit, including: diode half-bridge D1, on-board battery E1, start-up loop and auto-lock loop; one anode terminal of the diode half-bridge D1 is electrically connected with the output terminal of the external power supply E2, and the cathode terminal of the diode half-bridge D1 is electrically connected with the power supply terminal of the electric equipment Y; a starting loop and a self-locking loop are connected in parallel between the anode and the cathode of the onboard battery E1, an NPN triode Q1 is connected between the anode and the cathode of the onboard battery E1 on the starting loop, the collector of the NPN triode Q1 is connected to the anode of the onboard battery E1, and the emitter of the NPN triode Q1 is connected to the cathode of the onboard battery E1; a P-channel enhancement type MOSFET Q2 is connected between the anode and the cathode of the airborne battery E1 on the self-locking loop, the source electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the anode of the airborne battery E1, and the drain electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the other anode end of the diode half bridge D1; the base electrode of the NPN triode Q1 is connected to the self-locking loop through a lead, the base electrode of the NPN triode Q1 is simultaneously connected with a battery on-off control circuit, and the grid electrode of the P-channel enhancement type MOSFET Q2 is connected to the starting loop through a lead. Referring to fig. 1, in the initial state, the P-channel enhancement MOSFET Q2 is in the off state, the external power switch K2 is closed, and the external power supplies power to the electric device Y through one anode terminal of the diode half bridge D1.
Referring to fig. 2, a battery on-off control circuit sends a battery on-off command signal "B switch" (the voltage of the battery on-off control circuit is changed from 0V to 3V or higher) at an appropriate time, the rising edge of the command signal makes the base of an NPN transistor Q1 obtain a current temporarily, so that the collector and the emitter of the NPN transistor Q1 are temporarily turned on, so that a start-up loop connected to an onboard battery E1 is turned on, thereby pulling down the gate potential of a P-channel enhancement MOSFET Q2, when the circuit parameter configuration is appropriate, the source and the drain of the P-channel enhancement MOSFET Q2 are turned on, thereby turning on a self-lock loop connected to the onboard battery E1, the self-lock loop continuously provides a current to the base of the NPN transistor Q1 through a lead wire, so that the collector and the emitter of the NPN transistor Q1 are continuously turned on, thereby continuously turning on the start-up loop, and further keeping the gate potential of the P-channel enhancement MOSFET Q2 pulled down, the source and the drain of the P-channel enhancement type MOSFET Q2 are kept conducted, so that the self-locking function of the on-board battery E1 is achieved, the on-board battery E1 can supply power to the electric equipment Y through the other anode end of the diode half bridge D1 under the condition that a self-locking loop is conducted, and the external power supply E2 stops supplying power automatically as long as the voltage of the on-board battery E1 is larger than that of the external power supply E2.
As shown in fig. 3, in the self-locking state, even if the electric device Y is disconnected from the external power supply E2, i.e. the external power switch K1 is turned off, the on-board battery E1 continuously supplies power to the electric device Y through the P-channel enhancement MOSFET Q2 and the diode half-bridge D1.
As shown in fig. 4, when the power supply state of the onboard battery E1 needs to be turned off, the battery on-off control circuit sends a battery on-command signal "B switch" (the voltage of the power switching circuit changes from 3V or higher to 0V), a reverse voltage is provided to the base of the NPN transistor Q1, the current of the base of the NPN transistor Q1 can be cut off briefly, the collector and the emitter of the NPN transistor Q1 are disconnected, the start-up circuit and the self-locking circuit are both disconnected, the onboard battery E1 stops supplying power to the electric equipment Y, and the output end of the external power supply E2 recovers the power supply to the electric equipment Y through one anode end of the diode half-bridge D1.
Example 2
Referring to fig. 1, 2, 3 and 4, based on embodiment 1, the battery on-off control circuit is sequentially connected with a command transmitter N, a capacitor C1 and a resistor R1, and the resistor R1 is electrically connected with the base of an NPN triode Q1.
After a continuous voltage which is changed from 0V to 3V or higher is provided to one end of the capacitor C1 through the command transmitter N, the other end of the capacitor C1 temporarily provides starting current for the base electrode of the NPN triode Q1 through the resistor R1 when the capacitor C1 is charged fully, the voltage disappears after the capacitor C1 is charged fully, but the starting loop and the self-locking loop are kept conducted, and the onboard battery E1 is kept electrified; after a continuous voltage which is changed from 3V to 0V is provided to one end of the capacitor C1 through the command emitter N, the other end of the capacitor C1 draws current when the capacitor C1 is charged, so that the current of the base electrode of the NPN triode Q1 disappears, the collector electrode and the emitter electrode of the NPN triode Q1 are disconnected to start a loop, the grid potential of the P-channel enhancement type MOSFET Q2 is increased, the self-locking loop starts to be disconnected, the onboard battery E1 stops electrifying the electric equipment Y, and the external power supply recovers to supply power to the electric equipment Y through one anode end of the diode half-bridge D1.
Example 3
Referring to fig. 1, 2, 3 and 4, in addition to embodiment 2, an on-off safety switch K2 is connected between the command transmitter N and the capacitor C1.
When the power-on safety switch K2 is switched on, the onboard battery E1 can supply power to the electric equipment Y or stop supplying power by pressing the command emitter N, and when the power-on safety switch K2 is switched off, the battery on-off control circuit can be switched off, so that the command emitter N is prevented from being touched by mistake.
Example 4
Referring to fig. 1, 2, 3 and 4, based on embodiment 1, a resistor R5 and a resistor R2 are further connected to the self-locking loop, one end of the resistor R5 and one end of the resistor R2 are electrically connected to the base of an NPN triode Q1, the other end of the resistor R5 is electrically connected to the drain of a P-channel enhancement MOSFET Q2, and the other end of the resistor R2 is connected to the cathode of an onboard battery E1.
The voltage of the on-board battery E1 is 24V, the voltage of the external power supply E2 is 21V, when the startup loop is turned on, the source and the drain of the P-channel enhancement MOSFET Q2 are turned on, the resistor R5 and the resistor R2 can distribute the voltage applied to the self-locking loop, so that the voltage applied to one anode end of the diode half-bridge D1 by the R5 is greater than the voltage applied to the other anode end of the diode half-bridge D1 by the external power supply E2, so that the on-board battery E1 is kept powered, the external power supply E2 stops supplying power, and when the on-board battery E1 is disconnected, the external power supply E2 can be restored to supply power to the electric device Y by the diode half-bridge D1.
Example 5
Referring to fig. 1, 2, 3 and 4, based on embodiment 4, the resistance R5 is 33 kilo-ohms and the resistance R2 is 1 kilo-ohms in the self-locking loop.
And the resistor R5 on the self-locking loop is 33 kilo-ohms, and the resistor R2 is 1 kilo-ohms, so that when the self-locking loop is switched on, the onboard battery E1 shares the voltage on the resistor R5 to supply power to the electric equipment Y through the other anode end of the diode half-bridge D1, unnecessary consumption of the onboard battery E1 can be reduced, and meanwhile, the current provided by the resistor R5 to the base electrode of the NPN triode Q1 through a lead wire can be effectively limited.
Example 6
Referring to fig. 1, 2, 3 and 4, in addition to embodiment 4, a resistor R3 and a resistor R4 are further connected to the start circuit, one end of the resistor R3 is connected to the positive electrode of the onboard battery E1, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the collector of the NPN triode Q1.
When the base of the NPN transistor Q1 connected to the start circuit is powered on, the collector and emitter of the NPN transistor Q1 are turned on, and the resistor R3 and the resistor R4 connected between the anode of the onboard battery E1 and the collector of the NPN transistor Q1 prevent the start circuit from short-circuiting.
Example 7
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, in embodiment 6, the gate of the P-channel enhancement type MOSFET Q2 is connected between the resistor R3 and the resistor R4 in the start-up loop.
The resistor R3 is 10 kilo-ohms, the resistor R4 is 15 kilo-ohms, and when the starting loop is electrified, the electric potential of the grid electrode of the P-channel enhancement type MOSFET Q2 can be adjusted to be reduced, so that the source electrode and the drain electrode of the P-channel enhancement type MOSFET Q2 are conducted stably.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (6)
1. A self-locking power switching circuit, comprising:
a diode half-bridge D1, wherein one anode terminal of the diode half-bridge D1 is electrically connected with the output terminal of an external power supply E2, and the cathode terminal of the diode half-bridge D1 is electrically connected with the power supply terminal of the electric equipment Y;
the self-locking control circuit comprises an onboard battery E1, wherein a starting loop and a self-locking loop are connected in parallel between the anode and the cathode of the onboard battery E1, an NPN triode Q1 is connected to the starting loop from the anode to the cathode of the onboard battery E1, the collector of the NPN triode Q1 is connected to the anode of the onboard battery E1, and the emitter of the NPN triode Q1 is connected to the cathode of the onboard battery E1; a P-channel enhancement type MOSFET Q2 is connected between the anode and the cathode of the airborne battery E1 on the self-locking loop, the source electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the anode of the airborne battery E1, and the drain electrode of the P-channel enhancement type MOSFET Q2 is electrically connected with the other anode end of the diode half bridge D1;
the base electrode of the NPN triode Q1 is connected with the self-locking loop, the base electrode of the NPN triode Q1 is simultaneously connected with a battery on-off control circuit, and the grid electrode of the P-channel enhancement type MOSFET Q2 is connected to the starting loop.
2. The self-locking power switching circuit of claim 1, wherein the battery on-off control circuit is sequentially connected with a command transmitter N, a capacitor C1 and a resistor R1, and the resistor R1 is electrically connected with the base of an NPN triode Q1.
3. The self-locking power switching circuit of claim 1, wherein a resistor R5 and a resistor R2 are further connected to the self-locking loop, one end of the resistor R5 and one end of the resistor R2 are electrically connected to a base of an NPN triode Q1, the other end of the resistor R5 is electrically connected to a drain of a P-channel enhancement MOSFET Q2, and the other end of the resistor R2 is connected to a cathode of an onboard battery E1.
4. The self-locking power switching circuit of claim 3, wherein the resistance of the resistor R5 is much larger than the resistance of the resistor R2.
5. The self-locking power switching circuit of claim 3, wherein a resistor R3 and a resistor R4 are further connected to the start circuit, one end of the resistor R3 is connected to the positive electrode of the onboard battery E1, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the collector of an NPN transistor Q1.
6. The self-locking power switching circuit of claim 5, wherein the gate of the P-channel enhancement type MOSFET Q2 is connected between the resistor R3 and the resistor R4 on the start-up loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122108413.XU CN215990213U (en) | 2021-09-02 | 2021-09-02 | Self-locking power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122108413.XU CN215990213U (en) | 2021-09-02 | 2021-09-02 | Self-locking power supply switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215990213U true CN215990213U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122108413.XU Active CN215990213U (en) | 2021-09-02 | 2021-09-02 | Self-locking power supply switching circuit |
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| CN (1) | CN215990213U (en) |
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2021
- 2021-09-02 CN CN202122108413.XU patent/CN215990213U/en active Active
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