Portable equipment power supply management circuit

Abstract

The utility model discloses a portable equipment power supply management circuit, which comprises an MCU, a switch tube, a mechanical key switch and a battery, the MCU is connected with the battery through the switch tube, and a third input / output pin and a second input / output pin of the MCU are respectively and electrically connected with the switch tube so as to respectively control the on-off of the switch tube. A power supply voltage pin of the MCU is electrically connected with the battery through a mechanical key switch, a third input / output pin of the MCU is connected with the mechanical key switch, and the power supply voltage pin of the MCU is electrically connected with the battery through a switching tube. According to the power management circuit of the portable equipment, the switching tube is arranged between the MCU and the battery, so that the connection and disconnection of the battery and the MCU are realized by controlling the connection and disconnection of the switching tube, the battery can be completely disconnected from a load in a shutdown state, the consumption of the battery in the shutdown state is reduced, the durability of the battery is improved, and moreover, the power management circuit of the portable equipment is convenient to use. The mechanical key switch is arranged to control power-on and power-off, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, it relates to a portable equipment power management circuit. BACKGROUND

[0002] With the performance of portable terminal gradually improves, the application scope is also more and more wide, causes the power consumption of portable terminal more and more big, and the demand of endurance ability is also more and more high. The traditional portable medical equipment still cannot completely disconnect battery load in shutdown state, and there is consumption, reduces battery durability. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problem to provide a portable equipment power management circuit, to when the equipment is in shutdown state, can completely disconnect battery load, improves battery durability.

[0004] To solve the above technical problem, the utility model provides a portable equipment power management circuit, including MCU, switch tube, mechanical key switch and battery, the MCU is connected with the battery through the switch tube, and the third input output pin and the second input output pin of the MCU are connected with the switch tube electricity respectively, to control the on-off of the switch tube respectively, the power supply voltage pin of the MCU is connected with the battery electricity through the mechanical key switch, and the third input output pin of the MCU is connected with the mechanical key switch, and the power supply voltage pin of the MCU is connected with the battery electricity through the switch tube.

[0005] Its further technical scheme is that the switch tube adopts triode.

[0006] Its further technical scheme is that the portable equipment power management circuit further includes voltage division module, and the fourth input output pin of the MCU is connected with the battery through the voltage division module, to detect the electric quantity of battery through the voltage division module connected with the battery.

[0007] Its further technical scheme is that the voltage division module includes at least two series resistors.

[0008] Its further technical scheme is that the portable equipment power management circuit further includes charging management module, and the charging management module is connected with the MCU and the battery respectively, to supply power to the battery according to the control of the MCU.

[0009] Its further technical scheme is that the charging management module includes DC-DC power module and charging module, the DC-DC power module is connected with the power supply voltage pin of the MCU, and the first input output pin of the MCU is connected with the battery through the charging module, to control the charging module works and charges the battery.

[0010] Further, a fifth input-output pin of the MCU is connected with the charging module, and a grounding capacitor is connected between the charging module and the battery.

[0011] Further, the charging module comprises a charging chip.

[0012] Further, the charging management module further comprises a switching power supply connected with the MCU through the DC-DC power module.

[0013] The portable device power management circuit of the utility model has the advantages that the portable device power management circuit sets up a switching tube between the connection of the MCU and the battery, realizes the on-off of the connection between the battery and the MCU by controlling the on-off of the switching tube, realizes that the battery can be completely disconnected from the load when in the shutdown state, reduces the consumption of the battery in the shutdown state, improves the durability of the battery, and the mechanical key switch is set up to realize the on-off control, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0015] Figure 1 The utility model provides the schematic diagram of portable device power management circuit. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0017] Please refer to Figure 1 , Figure 1The utility model provides a portable equipment power management circuit's schematic diagram provides for the utility model embodiment, the portable equipment power management circuit includes MCU 11, switch tube Q1, mechanical key switch K1 and battery 12, MCU 11 is connected with battery 12 through switch tube Q1, the third input output pin IO3 and second input output pin IO2 of MCU 11 are connected with switch tube Q1 electricity respectively, to control the on-off of switch tube Q1 respectively, the power supply voltage pin VCC of MCU 11 is connected with battery 12 electricity through mechanical key switch K1, the third input output pin IO3 of MCU 11 is connected with mechanical key switch K1, to detect the state of mechanical key switch K1, that is, detect whether mechanical key switch K1 is pressed, the power supply voltage pin VCC of MCU 11 is connected with battery 12 electricity through switch tube Q1.

[0018] Among them, the portable equipment power management circuit is set up switch tube Q1 between the connection of MCU 11 and battery 12, to realize the on-off of battery 12 and MCU 11 connection by controlling the on-off of switch tube Q1, to be in the shutdown state, battery 12 can completely disconnect the load, reduce the consumption of battery 12 when shutting down, improve the durability of battery 12, and, by setting mechanical key switch K1 to control the shutdown, simple structure, compared with traditional self-locking switch, can save the occupied space, be favorable to the miniaturization design of portable equipment.

[0019] Specifically, the switch tube Q1 adopts a triode.

[0020] Specifically, the portable equipment power management circuit further includes a voltage dividing module 13, the fourth input output pin IO4 of the MCU 11 is connected with the battery 12 through the voltage dividing module 13, to detect the power of the battery 12 through the voltage dividing module 13 connected with the battery 12. Among them, when the MCU 11 detects that the power of the battery 12 is lower than the preset minimum power, the switch tube Q1 can be controlled to be disconnected through the second input output pin IO2, to disconnect the power supply of the battery 12 to the MCU 11, and then protect the battery 12. Preferably, the voltage dividing module 13 includes at least two series resistors.

[0021] Specifically, the portable equipment power management circuit further includes a charging management module 14, the charging management module 14 is connected with the MCU 11 and the battery 12 respectively, to supply power to the battery 12 according to the control of the MCU 11.

[0022] Specifically, the charging management module 14 comprises a DC-DC power module 141 and a charging module 142, the DC-DC power module 141 is connected with the power supply voltage pin VCC of the MCU 11, the first input-output pin IO1 of the MCU 11 is connected with the battery 12 through the charging module 142, to control the working of the charging module 142 and charge the battery 12. In the drawing, the power supply voltage pin VCC of the MCU 11 connected with the DC-DC power module 141 and the power supply voltage pin VCC of the MCU 11 connected with the switch tube Q1 are actually the same pin.

[0023] Specifically, the fifth input-output pin IO5 of the MCU 11 is connected with the charging module 142, and a grounding capacitor C1 is electrically connected between the charging module 142 and the battery 12. The grounding capacitor C1 is a capacitor with one end grounded, and the other end is connected with the battery 12 and the charging module 142 respectively. The capacity of the grounding capacitor C1 is small, so that the charging and discharging can be fast. The grounding capacitor C1 is connected between the charging module 142 and the battery 12, so that when the battery 12 is not connected, the charging module 142 charges the grounding capacitor C1, so that the fifth input-output pin IO5 of the MCU 11 can collect pulse square waves, so that whether the battery 12 is in the disconnected state can be judged according to the number of pulses collected in the preset time, to realize the battery 12 state detection. Moreover, the fifth input-output pin IO5 of the MCU 11 is connected with the battery 12 through the charging module 142, to detect whether the battery 12 is fully charged.

[0024] Specifically, the charging module 142 comprises a charging chip. Preferably, the charging chip can adopt a charging chip with a model number CN3763.

[0025] Specifically, the charging management module 14 further comprises a switching power supply 143, which is connected with the MCU 11 through the DC-DC power module 141.

[0026] Based on the above design, during charging, the commercial power supply is converted into corresponding power supply voltage through the DC-DC power module 141 and the switching power supply 143, and then transmitted to the charging module 142, and the converted power supply voltage supplies power to the power supply voltage pin VCC of the MCU 11, the MCU 11 starts to work and controls the working of the charging module 142 through the first input-output pin IO1, to charge the battery 12; when the mechanical key switch K1 is not pressed, the portable device is in the state of only charging without starting, when the mechanical key switch K1 is pressed, the third input-output pin IO3 of the MCU 11 detects the corresponding signal and controls the portable device to start and enter the starting process.

[0027] When starting, the mechanical key switch K1 is pressed, the supply voltage pin VCC of the MCU 11 is connected with the battery 12, the battery 12 supplies power to the MCU 11, and the MCU 11 starts; when the mechanical key switch K1 is in the pressed state, the third input and output pin IO3 of the MCU 11 detects the corresponding signal, controls the portable device to start and enter the starting process, and the second input and output pin IO2 of the MCU 11 controls the switch tube Q1 to be turned on and kept in the turned-on state, so that after the mechanical key switch K1 is released, the battery 12 can still supply power to the MCU 11 through the turned-on switch tube Q1.

[0028] When shutting down, the mechanical key switch K1 is pressed or other signals trigger the shutdown, enter the shutdown process, and the third input and output pin IO3 of the MCU 11 controls the switch tube Q1 to be turned off to disconnect the battery 12 and the MCU 11, and disconnect the power supply of the battery 12 to the MCU 11.

[0029] In summary, the portable device power management circuit of the utility model sets up the switch tube between the connection of the MCU and the battery, realizes the on-off of the connection of the battery and the MCU by controlling the on-off of the switch tube, so that when in the shutdown state, the battery can be completely disconnected from the load, the consumption of the battery in the shutdown state is reduced, the durability of the battery is improved, and the mechanical key switch is set to control the shutdown, and the structure is simple.

[0030] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A portable device power management circuit, characterized by, The portable device power management circuit comprises an MCU, a switch tube, a mechanical key switch and a battery, the MCU is connected with the battery through the switch tube, the third input-output pin and the second input-output pin of the MCU are electrically connected with the switch tube respectively to control the on-off of the switch tube, the power supply voltage pin of the MCU is electrically connected with the battery through the mechanical key switch, the third input-output pin of the MCU is connected with the mechanical key switch, and the power supply voltage pin of the MCU is electrically connected with the battery through the switch tube.

2. The portable device power management circuit of claim 1, wherein, The switch tube is a triode.

3. The portable device power management circuit of claim 1, wherein, The portable device power management circuit further comprises a voltage dividing module, the fourth input-output pin of the MCU is connected with the battery through the voltage dividing module to detect the battery capacity through the voltage dividing module connected with the battery.

4. The portable device power management circuit of claim 3, wherein, The voltage dividing module comprises at least two series-connected resistors.

5. The portable device power management circuit of claim 1, wherein, The portable device power management circuit further comprises a charging management module, the charging management module is connected with the MCU and the battery respectively to supply power to the battery according to the control of the MCU.

6. The portable device power management circuit of claim 5, wherein, The charging management module comprises a DC-DC power module and a charging module, the DC-DC power module is connected with the power supply voltage pin of the MCU, and the first input-output pin of the MCU is connected with the battery through the charging module to control the charging module to work and charge the battery.

7. The portable device power management circuit of claim 6, wherein, The fifth input-output pin of the MCU is connected with the charging module, and a grounding capacitor is electrically connected between the charging module and the battery.

8. The portable device power management circuit of claim 6, wherein, The charging module comprises a charging chip.

9. The portable device power management circuit of claim 6, wherein, The charging management module further comprises a switching power supply, and the switching power supply is connected with the MCU through the DC-DC power module.

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