CN217133251U

CN217133251U - Low-loss power supply circuit

Info

Publication number: CN217133251U
Application number: CN202123434997.6U
Authority: CN
Inventors: 包毅
Original assignee: Shenzhen Xinruida Information Technology Co ltd
Current assignee: Shenzhen Xinruida Information Technology Co ltd
Priority date: 2021-07-07
Filing date: 2021-12-30
Publication date: 2022-08-05
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a low-loss power supply circuit relates to the battery powered field. The circuit includes: the device comprises a battery, a discharge loop, a control unit and a voltage detection unit, wherein the discharge loop comprises a power switch tube and is used for supplying power to a load by the battery, the control unit comprises a single chip microcomputer and a key, one output end of the single chip microcomputer is connected with a control end of the power switch tube, the key is connected with one input end of the single chip microcomputer, the voltage detection unit is bridged between a positive electrode and a negative electrode of the battery, and the output end of the voltage detection unit is connected with the other input end of the single chip microcomputer, the voltage detection unit comprises an electronic switch, and the control end of the electronic switch is connected with one output end of the single chip microcomputer. According to the circuit, when the discharging loop where the load is located is cut off, the loop formed by the voltage detection unit and the battery is automatically cut off, and the loss of the battery in the shutdown state can be effectively reduced.

Description

Low-loss power supply circuit

Technical Field

The utility model relates to a battery powered technology field specifically is a low-loss power supply circuit.

Background

The battery power supply is a common power supply circuit, and is particularly suitable for outdoor equipment, mobile equipment and the like. Fig. 1 shows a battery-powered power supply circuit.

As shown in fig. 1, the present power supply circuit includes: a battery, a discharge circuit, a control unit 10, and a voltage detection unit 20. The battery is connected to the connector P1 and the load is connected to the connector P3. The discharging loop is used for supplying power to a load by the battery, and comprises a power switch tube Q2; the control unit 10 comprises a single chip microcomputer U2 and a key SW1, wherein an output end of the single chip microcomputer U2 is connected with a control end of the power switch tube Q2, and the key SW1 is connected with an input end of the single chip microcomputer U2; the voltage detection unit 20 is connected between the anode and the cathode of the battery in a bridge mode, and the output end of the voltage detection unit 20 is connected with the other input end of the single chip microcomputer U2.

The power supply circuit is provided with a voltage detection unit 20, and can detect the voltage across the battery in real time during operation. However, in the above power circuit, another circuit is formed from the positive electrode of the battery, the voltage detection unit 20, and the negative electrode of the battery, the other circuit is not controlled by the button SW1, and after the discharging circuit of the load is cut off by the button SW1, the other circuit is still in a closed state, which consumes the power of the battery, resulting in the power loss of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a low-loss power supply circuit to solve the above-mentioned defect that the correlation technique exists.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a low loss power supply circuit, comprising:

a battery;

a discharge circuit for the battery to supply power to a load, the discharge circuit including a power switch tube;

the control unit comprises a singlechip and a key, wherein one output end of the singlechip is connected with the control end of the power switch tube, and the key is connected with one input end of the singlechip; and

the voltage detection unit is bridged between the anode and the cathode of the battery, and the output end of the voltage detection unit is connected with the other input end of the singlechip;

wherein: the voltage detection unit comprises an electronic switch, and the control end of the electronic switch is connected with one output end of the single chip microcomputer.

In some embodiments, the control end of the electronic switch and the control end of the power switch tube are connected to the same output end of the single chip microcomputer, and the control end of the single chip microcomputer is connected to the control end of the electronic switch through a phase inverter.

Compared with the prior art, the utility model discloses following beneficial effect has at least:

according to the circuit, when the discharging loop where the load is located is cut off, the loop formed by the voltage detection unit and the battery is automatically cut off, and the loss of the battery in the shutdown state can be effectively reduced.

Drawings

FIG. 1 is a circuit diagram of a conventional power circuit;

FIG. 2 is a circuit diagram of a first embodiment of a low loss power supply circuit;

fig. 3 is a circuit diagram of a second embodiment of the low loss power circuit.

Detailed Description

The utility model discloses aim at improving a current power supply circuit to reduce the battery loss under the power off state. The present invention will be further explained with reference to the drawings and examples.

The first embodiment:

referring to fig. 2, the low loss power circuit includes: a battery, a discharge circuit, a control unit 10, and a voltage detection unit 20.

The battery is connected at connector P1 in fig. 2 and the load is connected at connector P3 in fig. 2.

The discharging loop is used for supplying power to the load for the battery, the discharging loop specifically comprises the battery, the load and a power switch tube Q2, the power switch tube Q2 adopts a MOS tube in the circuit, and the discharging loop is formed by sequentially passing through the load, the power switch tube Q2, the battery and the ground from the ground, namely the power supply loop of the battery to the load.

The control unit 10 comprises a singlechip U2 and a key SW 1. The 1 st pin and the 8 th pin of the single chip microcomputer U2 are two input ends, the 2 nd pin is a power supply end, the 4 th pin is a grounding end, the 7 th pin is an output end, and the 5 th pin and the 6 th pin are communication ends. The 7 th pin of the singlechip U2 is connected with the grid electrode of the MOS tube Q2 through a preamplifier consisting of a triode Q3 and peripheral elements thereof. One end of the key SW1 is grounded, the other end of the key SW1 is connected with the 8 th pin of the singlechip U2 through a fourth diode D4, the other end of the key SW1 is connected with the grid electrode of the MOS tube Q2 through a fifth diode D5, and a tenth resistor R10 is connected between the grid electrode of the MOS tube Q2 and the anode of the battery.

The voltage detection unit 20 is connected across the positive and negative electrodes of the battery. The voltage detection unit 20 comprises a fifth resistor R5 and a sixth resistor R6 which are connected in series, the common end of the fifth resistor R5 and the sixth resistor R6 forms the output end of the voltage detection unit 20, and the output end is connected with the 1 st pin of the singlechip U2. More importantly, the voltage detection unit 20 further comprises an electronic switch Q1, and a control end of the electronic switch Q1 is connected with the 7 th pin of the single chip microcomputer U2.

The working process of the low-loss power supply circuit of the embodiment is as follows:

when the key SW1 is pressed for three seconds, the MOS tube Q2 is conducted, the system is powered on, the single chip microcomputer U2 works, the 8 th pin of the single chip microcomputer U2 detects a low level, the level is maintained to be 3S, the 7 th pin of the single chip microcomputer U2 outputs a high level, the MOS tube Q2 is maintained to be in a conducting state, and after the key SW1 is released, the system can still supply power normally; the high level of singlechip U2's 7 th round of foot output still makes electronic switch Q1 switch on, and voltage detection unit 20 forms the return circuit with the battery, detects the voltage of battery, and the detection voltage value is sent into singlechip U2's 1 st foot and is carried out AD conversion, obtains corresponding voltage value, exports for corresponding circuit or host computer through singlechip U2's 5 th, 6 th round of foot serial ports and shows.

Pressing the button SW1 again turns off the power supply circuit from the battery to the load. At this time, when the 8 th pin of the single chip microcomputer U2 detects the turn-off signal, the 7 th pin outputs a low level, on one hand, the MOS transistor Q2 is controlled to be turned off, so that the power supply loop of the battery to the load is turned off, on the other hand, the low level output by the 7 th pin of the single chip microcomputer U2 turns off the electronic switch Q1, the loop formed by the voltage detection unit 20 and the battery is disconnected, and the voltage detection unit 20 does not consume the electric quantity of the battery, so that the loss of the battery can be reduced.

Second embodiment:

referring to fig. 3, the low loss power circuit includes: a battery, a discharge circuit, a control unit 10, and a voltage detection unit 20.

The second embodiment is substantially the same as the first embodiment except that: in the second embodiment, an inverter 30 is connected to the control terminal of the electronic switch Q1, and the 7 th pin of the single chip microcomputer U2 is connected to the control terminal of the electronic switch Q1 through the inverter 30.

As can be seen from the above, in the above embodiment, the electronic switch Q1 is connected in series in the voltage detection unit 20 of the battery, and the single chip microcomputer U2 of the control unit 10 of the power circuit is used to control the electronic switch Q1 to turn on/off, so that when the loop where the load is located is turned off, the loop formed by the voltage detection unit 20 and the battery is automatically cut off, thereby achieving the effect of reducing the loss of the battery in the shutdown state.

The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for assisting the skilled person in understanding the content of the present invention, and can not be understood as the limitation of the protection scope of the present invention. Various decorations, equivalent changes and the like which are performed on the scheme by the technical personnel in the field under the conception of the invention are all included in the protection scope of the invention.

Claims

1. A low loss power supply circuit comprising:

a battery;

the method is characterized in that: the voltage detection unit comprises an electronic switch, and the control end of the electronic switch is connected with one output end of the single chip microcomputer.

2. The low loss power supply circuit according to claim 1, wherein the control terminal of said electronic switch and the control terminal of said power switch transistor are connected to the same output terminal of said single chip microcomputer, and said control terminal of said single chip microcomputer is connected to the control terminal of said electronic switch through an inverter.