CN218648590U - Lithium battery power supply circuit with low power consumption - Google Patents
Lithium battery power supply circuit with low power consumption Download PDFInfo
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- CN218648590U CN218648590U CN202222583172.9U CN202222583172U CN218648590U CN 218648590 U CN218648590 U CN 218648590U CN 202222583172 U CN202222583172 U CN 202222583172U CN 218648590 U CN218648590 U CN 218648590U
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Abstract
The utility model provides a lithium battery power supply circuit of low-power consumption, including power supply branch road, power auto-lock branch road and the activation branch road that charges, the activation branch road that charges is through control the purpose that power auto-lock branch road reached control power supply branch road break-make. The utility model discloses detecting the back that system battery is full of at lithium cell MCU, closing power auto-lock branch road through the activation branch road that charges to make the mains operated branch road close, realized the self-closing of system power, reduced the consumption of complete machine system circuit.
Description
Technical Field
The utility model belongs to the technical field of the circuit technique and specifically relates to a lithium battery power supply circuit who is used for a low-power consumption.
Background
When a charger is used for charging a lithium battery, a charging activation circuit of the conventional lithium battery continuously outputs a charging activation signal in a charging output state, and after the battery is fully charged, the charging activation signal is continuously output under the condition that the charger is not removed, a lithium battery MCU (microprogrammed control unit) cannot cut off a system power supply, so that the system power consumption always exists, if the charger is inserted for a long time, and when a user starts to use the machine, the electric quantity is consumed after the battery is fully charged due to the system power consumption, so that the system power supply is not in a full-charge state when the user uses the machine.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a lithium battery power supply circuit of low-power consumption.
The main contents of the utility model include:
a low-power lithium battery power supply circuit comprises:
the power supply branch comprises a system power end, a power supply switch unit and a power supply output end;
the power supply self-locking branch circuit is used for receiving a control signal of the lithium battery MCU to control the on-off of the power supply switch unit, and comprises a signal input end, a self-locking switch unit and a signal output end, wherein the signal input end is connected with a latching control signal interface of the lithium battery MCU, and the signal output end is connected with the power supply switch unit;
the charging activation branch comprises a charger access signal port and a full output port; the full-automatic output port is connected with the self-locking switch unit and used for controlling the on-off of the self-locking switch unit.
Preferably, the power supply switch unit comprises a power supply MOS transistor, a power supply current limiting resistor, and a power supply pull-down resistor; the power supply MOS tube is a P-type MOS tube, the source electrode of the power supply MOS tube is connected with the power supply end of the system, the drain electrode of the power supply MOS tube is connected with the power supply output end, and the grid electrode of the power supply MOS tube is connected with the power supply self-locking branch circuit through the power supply current limiting resistor; and the power supply pull-down resistor is connected between the source electrode and the grid electrode of the power supply MOS tube.
Preferably, the self-locking switch unit comprises a self-locking MOS tube, a self-locking pull-down resistor, a self-locking current-limiting resistor and a self-locking diode; the drain electrode of the self-locking MOS tube is connected with the power supply pull-down resistor, the source electrode of the self-locking MOS tube is grounded, the grid electrode of the self-locking MOS tube is connected with the negative electrode of the self-locking diode, the positive electrode of the self-locking diode is connected with one end of the self-locking current-limiting resistor, and the other end of the self-locking current-limiting resistor is connected with the signal input end; and two ends of the power supply pull-down resistor are connected between the grid and the source of the self-locking MOS tube.
Preferably, the charging activation branch further includes a high-resistance resistor, a full-charge protection capacitor, and an isolation diode, the high-resistance resistor is connected in parallel with the full-charge protection capacitor, one end of the high-resistance resistor is connected to the signal input terminal, the other end of the high-resistance resistor is connected to the anode of the isolation diode, and the cathode of the isolation diode is connected to the gate of the self-locking MOS transistor through the full-charge output port.
Preferably, the power supply branch further comprises a first power supply resistor, a second power supply resistor, a power-off buffering unit and a power chip; the first power supply resistor and the second power supply resistor are connected in parallel, one end of the first power supply resistor is connected with a system power end, the other end of the first power supply resistor is connected with one end of the power supply switch unit, and the other end of the power supply switch unit is connected with the power supply chip through a power-off buffer unit.
Preferably, the power-off buffering unit comprises a buffering triode, a buffering resistor, a buffering capacitor and a buffering voltage stabilizing diode; the collector of the buffer triode is connected with the power supply switch unit, the emitter of the buffer triode is connected with the power supply chip, and the base of the buffer triode is grounded through a buffer capacitor and a buffer voltage-stabilizing diode which are connected in parallel; the buffer resistor is connected between the collector and the base of the buffer triode.
The beneficial effects of the utility model reside in that: the utility model provides a lithium battery power supply circuit of low-power consumption detects the system battery at lithium cell MCU and is full of the back, closes power auto-lock branch road through the activation branch road that charges to make the mains operated branch road close, realized the self-closing of system power, reduced the consumption of complete machine system circuit.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solution protected by the present invention is specifically described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a low-power consumption lithium battery power supply circuit, which comprises a power supply branch, a power self-locking branch and a charging activation branch, wherein the power supply branch is used for charging a lithium battery by a charger; the power supply self-locking branch circuit provides on-off control for the power supply branch circuit, and the charging activation branch circuit controls the on-off of the power supply self-locking branch circuit.
Specifically, the power supply branch comprises a system power supply end VBAT, a power supply switch unit and a power supply output end, and in this embodiment, the power supply branch outputs a 5V voltage; further, the power supply branch comprises a first power supply resistor R10 and a second power supply resistor R12 which are connected in parallel, a power supply switch unit connected in series with the first power supply resistor R10 and the second power supply resistor R12, a power-off buffering unit connected in series with the power supply switch unit, and a power chip connected with the power output end.
Furthermore, after the first power supply resistor R10 and the second power supply resistor R12 are connected in parallel, one end of the first power supply resistor R is connected to a system power source terminal VBAT, and the other end of the first power supply resistor R is connected to one end of the power supply switch unit, where the power supply switch unit includes a power supply MOS transistor Q4, a power supply current limiting resistor R15, and a power supply pull-down resistor R13; the power supply MOS tube Q4 is a P-type MOS tube, the source electrode of the power supply MOS tube Q4 is connected with the other ends of the first power supply resistor R10 and the second power supply resistor R12 which are connected in parallel, the drain electrode of the power supply MOS tube Q is connected with the power-off buffering unit, and the grid electrode of the power supply MOS tube Q4 is connected with the power supply self-locking branch circuit through the power supply current limiting resistor R15; and the power supply pull-down resistor R13 is connected between the source electrode and the grid electrode of the power supply MOS transistor q 4.
The power-off buffer unit comprises a buffer triode Q5, a buffer resistor R14, a buffer capacitor C1 and a buffer voltage-stabilizing diode ZD2; a collector of the buffer triode Q5 is connected with a drain of the power supply MOS tube Q4, an emitter of the buffer triode Q5 is connected with the power supply chip U2, and a base of the buffer triode Q5 is grounded through a buffer capacitor C1 and a buffer voltage-stabilizing diode ZD2 which are connected in parallel; the buffer resistor R14 is connected between the collector and the base of the buffer triode Q5.
In this embodiment, the POWER self-locking branch is configured to receive a control signal of the lithium battery MCU to control on/off of the POWER supply switch unit, and specifically, the POWER self-locking branch includes a signal input end P, a self-locking switch unit, and a signal output end, where the signal input end is connected to a latch control signal interface POWER of the lithium battery MCU, and the signal output end is connected to the POWER supply current limiting resistor R15; the self-locking switch unit comprises a self-locking MOS tube Q6, a self-locking pull-down resistor R17, a self-locking current-limiting resistor R16 and a self-locking diode D3; the drain electrode of the self-locking MOS tube Q6 is connected with the POWER supply pull-down resistor R15, the source electrode of the self-locking MOS tube Q6 is grounded, the grid electrode of the self-locking MOS tube Q3 is connected with the negative electrode of the self-locking diode D3, the positive electrode of the self-locking diode D3 is connected with one end of the self-locking current limiting resistor R16, the other end of the self-locking current limiting resistor R16 is connected with the signal input end, and a control signal sent by a latching control signal interface POWER of a lithium battery MCU is received; and two ends of the power supply pull-down resistor R17 are connected between the grid electrode and the source electrode of the self-locking MOS tube Q6.
In this embodiment, the charging activation branch includes a charger access signal port CH +, a full output port, a high resistance resistor R18, a full protection capacitor C12, and an isolation diode D4; the full-filling output port is connected with the self-locking switch unit and used for controlling the on-off of the self-locking switch unit; the high-resistance resistor R18 is connected with the full-charge protection capacitor C12 in parallel, one end of the high-resistance resistor R is connected with the signal input end CH +, the other end of the high-resistance resistor R is connected with the anode of the isolation diode D4, and the cathode of the isolation diode D4 is connected with the grid electrode of the self-locking MOS tube Q6 through the full-charge output port.
When an external charger is inserted, the signal input end CH + inputs the voltage of the charger, at the moment, as the charger is just connected, no charge is on the full protective capacitor C12, the voltage of the charger starts to charge the full protective capacitor C, and meanwhile, the current of the charger is transmitted to the self-locking MOS tube Q6 through the isolation diode D4 to be conducted; and the self-locking MOS tube Q6 is switched on, so that the power supply end of the system is switched on after passing through the first power supply resistor R10, the second power supply resistor R12 and the power supply pull-down resistor R13, the power supply MOS tube Q4 is switched on, power can be supplied to the power chip U2 through the power-off buffer unit, and finally the power chip U2 outputs 5V voltage.
In the charging process, the full-charge protection capacitor C12 is charged so that current does not flow through the full-charge protection capacitor C, and before the lithium battery is fully charged, a latch control signal interface POWER of the lithium battery MCU outputs a high level to control the self-locking MOS tube Q6 to be kept conducted, so that a POWER supply branch of the POWER supply is kept communicated, and the system POWER supply can continuously supply POWER to the POWER chip U2; and after the lithium battery is fully charged, the latch control signal interface POWER of the lithium battery MCU outputs a low level, and at the moment, because the full protection capacitor C12 is fully charged, the POWER supply MCU can not provide a starting voltage for the self-locking MOS tube Q6 any more, so that the POWER supply MOS tube is in a disconnected state, the system POWER supply can not supply POWER for the POWER chip U2 any more, the system POWER supply is cut off after the lithium battery is fully charged, and the whole machine enters a low-POWER-consumption state.
The above-mentioned only be the embodiment of the present invention, not consequently the restriction of the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transform made of the content of the specification and the attached drawings, or directly or indirectly use in other relevant technical fields, all including in the same way the patent protection scope of the present invention.
Claims (6)
1. A low-power consumption lithium battery power supply circuit is characterized by comprising:
the power supply branch comprises a system power end, a power supply switch unit, a power chip and a power output end;
the power supply self-locking branch circuit is used for receiving a control signal of the lithium battery MCU to control the on-off of the power supply switch unit, and comprises a signal input end, a self-locking switch unit and a signal output end, wherein the signal input end is connected with a latching control signal interface of the lithium battery MCU, and the signal output end is connected with the power supply switch unit;
the charging activation branch comprises a charger access signal port and a full charging output port; the full-automatic output port is connected with the self-locking switch unit and used for controlling the on-off of the self-locking switch unit.
2. The power supply circuit of the lithium battery power supply with low power consumption as claimed in claim 1, wherein the power supply switching unit comprises a power supply MOS tube, a power supply current limiting resistor and a power supply pull-down resistor; the power supply MOS tube is a P-type MOS tube, the source electrode of the power supply MOS tube is connected with the power supply end of the system, the drain electrode of the power supply MOS tube is connected with the power supply output end, and the grid electrode of the power supply MOS tube is connected with the power supply self-locking branch circuit through the power supply current limiting resistor; and the power supply pull-down resistor is connected between the source electrode and the grid electrode of the power supply MOS tube.
3. The power supply circuit of a lithium battery power supply with low power consumption of claim 2, wherein the self-locking switch unit comprises a self-locking MOS tube, a self-locking pull-down resistor, a self-locking current-limiting resistor and a self-locking diode; the drain electrode of the self-locking MOS tube is connected with the power supply pull-down resistor, the source electrode of the self-locking MOS tube is grounded, the grid electrode of the self-locking MOS tube is connected with the negative electrode of the self-locking diode, the positive electrode of the self-locking diode is connected with one end of the self-locking current-limiting resistor, and the other end of the self-locking current-limiting resistor is connected with the signal input end; and two ends of the power supply pull-down resistor are connected between the grid and the source of the self-locking MOS tube.
4. The power supply circuit of the lithium battery power supply with low power consumption as claimed in claim 3, wherein the charging activation branch further comprises a high-resistance resistor, a full protection capacitor and an isolation diode, the high-resistance resistor and the full protection capacitor are connected in parallel, one end of the high-resistance resistor is connected with the signal input end, the other end of the high-resistance resistor is connected with the anode of the isolation diode, and the cathode of the isolation diode is connected with the gate of the self-locking MOS tube through the full output port.
5. The power supply circuit of a lithium battery power supply with low power consumption of claim 1, wherein the power supply branch further comprises a first supply resistor, a second supply resistor and a power-off buffer unit; the first power supply resistor and the second power supply resistor are connected in parallel, one end of the first power supply resistor is connected with a system power end, the other end of the first power supply resistor is connected with one end of the power supply switch unit, and the other end of the power supply switch unit is connected with the power supply chip through a power-off buffer unit.
6. The power supply circuit of claim 5, wherein the power-off buffering unit comprises a buffering triode, a buffering resistor, a buffering capacitor and a buffering zener diode; the collector of the buffer triode is connected with the power supply switch unit, the emitter of the buffer triode is connected with the power supply chip, and the base of the buffer triode is grounded through a buffer capacitor and a buffer voltage-stabilizing diode which are connected in parallel; the buffer resistor is connected between the collector and the base of the buffer triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222583172.9U CN218648590U (en) | 2022-09-28 | 2022-09-28 | Lithium battery power supply circuit with low power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222583172.9U CN218648590U (en) | 2022-09-28 | 2022-09-28 | Lithium battery power supply circuit with low power consumption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218648590U true CN218648590U (en) | 2023-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222583172.9U Active CN218648590U (en) | 2022-09-28 | 2022-09-28 | Lithium battery power supply circuit with low power consumption |
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| Country | Link |
|---|---|
| CN (1) | CN218648590U (en) |
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- 2022-09-28 CN CN202222583172.9U patent/CN218648590U/en active Active
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