CN204886324U - A power management and power display system - Google Patents

Abstract

The utility model relates to a power management and battery indicator system. It includes switching of power module, charging management module, button module and singlechip, the switching of power module includes direct current charging source interface, battery supply interface and STAT port, charging management module includes direct current charging source interface, CHRG control port and STDBY port, the button module includes KEY port and CONTROL port, the singlechip is equipped with and the corresponding IO port of above -mentioned all ports, and it still includes power indicator and quantity indicating lamp. Compared with the prior art, the utility model discloses can be at the current battery power of the accurate effectual demonstration of difference under two kinds of modes of DC power supply power supply and battery supply power supply to consider battery power's durability simultaneously, make the function of equipment reach high -efficient stable level, have very high using value in the aspect of embedded electronic equipment.

Description

A power management and power display system

technical field

The utility model belongs to the technical field of power management, and in particular relates to a power management and power display system.

Background technique

The general power supply structure of embedded electronic equipment is as follows: a battery can be installed to directly use the power provided by the battery to work, and a power supply interface connector such as a DC power connector can also be installed to draw power for the normal operation of the equipment. Considering factors such as economy and environmental protection, there are more and more applications of batteries, and battery power management has become one of the key technologies of portable electronic products. Due to its economic and environmental advantages, rechargeable batteries are widely used in electronic equipment. Power selection plays an important role. Most portable embedded electronic devices use rechargeable batteries. Compared with traditional rechargeable batteries such as nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries can provide greater discharge current And almost no memory effect, making it more and more common in electronic equipment. For electronic equipment that needs to work on the industrial site, due to the lack of a DC power supply that can be charged at any time, it is of great significance to know the battery power status in real time and accurately for the effective and correct on-site measurement of electronic equipment.

Due to the small size and compact shell structure of portable embedded electronic devices, the layout of the indicator lights on the panel is required to be concise and tidy, and to be able to effectively indicate the operating status of the device and the current battery power status. In the two states of DC power supply for charging and power-on work, the power display mode is different. When the device is connected to the DC power supply for charging, the power indicator light continues to light up to display the real-time power and charging status of the battery when the device is not powered on; In the normal working state of the power on, in order to reduce the power consumption of the battery, only when you need to check the battery power, click a single button to display the power, and turn off the power indicator after a certain period of time. For different working occasions and situations, it is necessary for electronic equipment to be able to switch between DC power supply and battery power supply to provide the required working voltage for the subsequent circuit.

Contents of the invention

In order to solve the above technical problems, the utility model provides an intelligent power management and power display system.

A power management and power display system described in the utility model, the power management and power display system includes a power switching module 1, a charging management module 2, a button module 3 and a single-chip microcomputer 4; the power switching module 1 includes a DC charging power interface, battery power interface and STAT port; the charging management module 2 includes a DC charging power interface, a CHRG control port and a STDBY port; the button module 3 includes a KEY port and a CONTROL port; the single-chip microcomputer 4 is provided with all of the above The port corresponds to the I/O port, which also includes a power indicator light and a power indicator light.

In the power management and power display system described in the utility model, the power switching module 1 adopts a LTC4411 chip.

In the power management and power display system described in the utility model, the charging management module 2 adopts a TP4056 chip.

In the power management and power display system described in the utility model, the power indicator light contains 4 LED lights, and the number of LED lights respectively corresponds to the four power intervals of the battery: lower than 3.4v, 3.4v -3.8v, 3.8v-4.2v and full battery status.

Compared with the prior art, the power management and power display system described in the utility model can accurately and effectively display the current battery power under the two modes of DC power supply and battery power supply respectively, and at the same time consider the durability of the battery power, In the power-on working state, the power display is only performed when the battery power needs to be checked and the power indicator light is turned off after a certain period of time. During the DC charging process, the battery power and charging voltage are continuously displayed, and it can cooperate with the button circuit and charging management. Circuits, etc., through the single-chip microcomputer to detect the level status of the corresponding port to perform corresponding and accurate actions, so that the operation of the device can reach an efficient and stable level. Therefore, it has high application value in embedded electronic devices.

Description of drawings

Figure 1: Schematic diagram of power switching circuit; Figure 2: Schematic diagram of charging management circuit; Figure 3: Schematic diagram of button circuit; Figure 4: Schematic diagram of single-chip circuit; .

Detailed ways

The power management and power display system described in the present invention will be further described below in combination with specific embodiments, but the protection scope of the present invention is not limited thereto.

Example 1

A power management and power display system, the power management and power display system includes a power switching module 1, a charging management module 2, a button module 3 and a single-chip microcomputer 4; the power switching module 1 includes a DC charging power interface and a battery power interface and STAT ports; the charging management module 2 includes a DC charging power interface, a CHRG control port and a STDBY port; the button module 3 includes a KEY port and a CONTROL port; the single-chip microcomputer 4 is provided with I/Os corresponding to all of the above ports port, which also includes a power indicator and a battery indicator. The power switching module 1 adopts an LTC4411 chip. The charging management module 2 adopts a TP4056 chip. The battery indicator light includes 4 LED lights, and the LED lights are respectively corresponding to the four power ranges of the battery: below 3.4v, 3.4v-3.8v, 3.8v-4.2v and the battery is fully charged.

The charging process is as follows: After plugging in the DC charging power supply, the battery enters the charging state under the control of the charging signal CHRG. First, it is trickle charging. After the charging current reaches a certain value, it enters the constant current charging state until the battery voltage reaches the maximum value of 4.2v. After that, it enters the constant voltage charging process. After the constant voltage charging process ends and the battery is fully charged, the STDBY terminal of TP4056 gives a low level signal BatteryFull.

The working principle of the power display is: connect to the DC charging power supply, during the charging process of the battery, the number of 4 LED lights is corresponding to the four power ranges of the battery: lower than 3.4v, 3.4v-3.8v, 3.8v -4.2v and battery full state. When charging to any voltage value lower than 4.2v, the indicator light in the interval below the voltage value is continuously lit, and the indicator light corresponding to the voltage value is in the blinking state; v, 3.4v-3.8v and 3.8v-4.2v three corresponding indicator lights are all on, the indicator light corresponding to the battery full state is flashing, the battery enters the constant voltage charging process, after the constant voltage charging is completed, 4 All LED lights are on and the battery is fully charged. When there is no DC charging power supply connected, the number of 4 LED lights on corresponds to the four power ranges of the battery: less than 3.4v, 3.4v-3.7v, 3.7v-4.0v and 4.0v-4.2v. When the button is turned on, the corresponding power indicator light is on, and then goes out after 2 seconds; when the button is turned off, the corresponding power indicator light is on first, and the power indicator light goes off after the circuit is disconnected.

The working process of the power display is as follows: when the DC power supply is connected to charge, the STAT terminal of the power switching module chip LTC4411 shown in Figure 1 gives a low level POWER, and the corresponding I/O port of the microcontroller shown in Figure 4 detects the low level POWER. After leveling, it is connected to the positive pole VBATT of the battery power supply, and the corresponding I/O port with ADC function carries out AD acquisition of the battery voltage, and compares the converted voltage value with the voltage range indicated by the 4 LED lights, and if it is lower than this The indicator light of the voltage value interval is lit and is continuously lit, and the indicator light corresponding to the voltage value interval is blinking. After the battery voltage is charged to 4.2v, it enters the constant voltage charging state. The LED indicator corresponding to the battery full state is blinking, and the other 3 LED lights are continuously lit until the constant voltage charging is completed. After the battery is fully charged, at this time , the STDBY terminal of the charging management chip TP4056 shown in Figure 2 gives a low-level BatteryFull, and after the corresponding I/O port of the microcontroller detects the low-level signal, the LED corresponding to the full state of the battery is also lit, that is, the power display circuit 4 All LED lights are on, and the entire charging process is completed. There is no DC charging power supply connected, the STAT terminal of the power switch module shown in Figure 1 is in the high-level POWER state, after the single-chip microcomputer detects the high-level signal, it enters the waiting button action program, and when the power is turned on, the button shown in Figure 3 The KEY terminal of the circuit gives a low level, and at the same time the CONTROL terminal becomes a high level. After the microcontroller detects the high level of the CONTROL terminal, the power indicator light is turned on, indicating that the circuit is connected, and then the microcontroller detects that the KEY terminal is low. After the level signal is connected to the positive VBATT terminal of the battery, the I/O port with ADC function performs AD acquisition of the battery voltage, and compares the converted voltage value with the power range represented by the four LED lights. The number of indicators corresponding to the battery voltage value is lit, and the timing counter of the single-chip microcomputer starts timing. After the timing reaches 2s, the power indicator light is turned off, and the single-chip microcomputer starts to wait for the next button action. During the normal working process of the device, press the button at any time, and the KEY terminal will give a low level. According to the low level signal detected by the microcontroller, it is also connected to the positive VBATT terminal of the battery, and the I/O with ADC function The O port performs AD acquisition on the battery voltage, lights up the number of indicator lights corresponding to the converted voltage value, and turns off the power indicator light after the timing reaches 2s. When the button is turned off, first the KEY terminal will give a low-level signal, so the single-chip microcomputer first collects and displays the battery power according to the detected low-level signal, and then the CONTROL terminal becomes low-level, and the single-chip microcomputer detects the CONTROL After receiving the low-level signal, turn off the power indicator light, disconnect the circuit, and then turn off the power indicator light to complete the button shutdown action.

Claims (4)

1. a power management and electric quantity display system, it is characterized in that, described power management and electric quantity display system comprise electrical source exchange module (1), charge management module (2), key-press module (3) and single-chip microcomputer (4); Described electrical source exchange module (1) comprises DC charging power supply interface, battery supply interface and STAT port; Described charge management module (2) comprises DC charging power supply interface, CHRG control port and STDBY port; Described key-press module (3) comprises KEY port and CONTROL port; Described single-chip microcomputer (4) is provided with the I/O port corresponding to above-mentioned all of the port, and it also comprises power supply indicator and battery capacity indication lamp.

2. a kind of power management according to claim 1 and electric quantity display system, is characterized in that, described electrical source exchange module (1) adopts LTC4411 cake core.

3. a kind of power management according to claim 1 and electric quantity display system, is characterized in that, described charge management module (2) adopts TP4056 cake core.

4. a kind of power management according to claim 1 and electric quantity display system, it is characterized in that, described battery capacity indication lamp contains 4 LED, four the electricity intervals of this LED number of lights respectively residing for corresponding battery: lower than 3.4v, 3.4v-3.8v, 3.8v-4.2v and battery full state.