Circuit for prolonging power-off endurance of battery

Abstract

The utility model relates to a circuit for prolonging the power-off endurance of a battery, which belongs to the technical field of electronics and comprises a USB (universal serial bus) input circuit for inputting USB voltage; the input filter circuit is used for USB voltage input filtering and stabilizing the input voltage; the charging control circuit is used for charging control detection, charging switch energy storage and charging output voltage filtering; the charging temperature detection circuit is used for battery NTC temperature detection; and the battery connection circuit is used for connecting the battery positive and negative electrodes and the battery NTC. The charging temperature detection circuit has the advantages that the MOS tube Q1, the control resistor R2 and the GND are added in charging temperature detection, battery charging over-temperature protection is started only when charging is conducted, connection is disconnected in a non-charging state, it is ensured that no direct loop exists between the positive electrode of the battery and the GND in a shutdown state, actually, the MOS tube Q1 and the resistor R2 are not added in the shutdown state, the GND is directly connected, and the leakage current of the battery is 44 uA; when the MOS tube Q1 is added in the shutdown state, the leakage current of the battery is 2uA, and the leakage current of the shutdown battery is obviously reduced.

Description

Technical Field

[0001] The utility model relates to a circuit for extending the shutdown battery life, belonging to the field of electronic technology. Background Art

[0002] In the field of consumer electronics products, the standby time of the battery is a key performance index, which directly affects the user experience and the market competitiveness of the product. With the development of technology and the improvement of user requirements, how to improve the shutdown battery life has become an important issue in the design of electronic products.

[0003] First of all, reducing the shutdown current of the product is an effective means to improve the shutdown battery life. This can be achieved by optimizing the circuit design, such as using low-power microcontrollers and sensors, and using efficient power management technologies. In the circuit design, a sleep mode or a deep sleep mode can be introduced to make the device consume extremely little electric energy when not in use.

[0004] Secondly, the performance of the battery itself is also an important factor affecting the shutdown battery life. Selecting a battery with a high energy density and a low self-discharge rate can provide a longer usage time under the same volume. At the same time, the charge and discharge management of the battery is also crucial. A reasonable charge and discharge strategy can extend the service life of the battery, thereby indirectly improving the shutdown battery life.

[0005] The existing technologies have the following drawbacks in improving the shutdown battery life. For example, the circuit design is not optimized enough, and modern low-power technologies and components are not fully utilized, or the circuit structure is not optimized, resulting in a relatively high current consumption even in the shutdown state. Summary of the Utility Model

[0006] To overcome the defects of the existing technologies, the utility model provides a circuit for extending the shutdown battery life. The technical solution of the utility model is as follows:

[0007] An embodiment of the utility model provides a circuit for extending the shutdown battery life, including a USB input circuit for USB voltage input; an input filter circuit for filtering the USB voltage input to stabilize the input voltage;

[0008] a charging control circuit for charging control detection, charging switch energy storage, and charging output voltage filtering; a charging temperature detection circuit for detecting the NTC temperature of the battery; and a battery connection circuit for connecting the positive and negative electrodes of the battery and the battery NTC.

[0009] Optionally, the USB input circuit includes a USB socket J1. The first pin of the USB socket J1 is connected to the input end of the input filter circuit, and the fourth pin of the USB socket J1 is grounded.

[0010] Optionally, the input filter circuit includes a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 are connected in parallel, one end of the capacitor C1 and one end of the capacitor C2 are both connected to the first pin of the USB socket J1 and then connected to the input end of the charging control circuit, and the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded.

[0011] Optionally, the charging control circuit includes a charging management chip U1, a storage inductor L1, a capacitor C3 and a capacitor C4. The first pin of the charging management chip U1 is connected to one end of the capacitor C1 and the capacitor C2, and the first pin of the charging management chip U1 is also connected to the charging temperature detection circuit; the second pin of the charging management chip U1 is connected to one end of the storage inductor L1, and the other end of the storage inductor L1 is connected to one end of the capacitor C3, one end of the capacitor C4, the charging temperature detection circuit, the third pin of the charging management chip U1 and the battery connection circuit; the other ends of the capacitor C3 and the capacitor C4 are grounded; the fourth pin of the charging management chip U1 is connected to the charging temperature detection circuit and the battery connection circuit; the fifth pin of the charging management chip U1 is grounded.

[0012] Optionally, the charging temperature detection circuit includes a resistor R1, a resistor R2 and a MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the first pin of the charging management chip U1, the source of the MOS transistor Q1 is grounded, the drain of the MOS transistor Q1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the fourth pin of the charging management chip U1, one end of the resistor R1 and the battery connection circuit; the other end of the resistor R1 is connected to the third pin of the charging management chip U1, and the charging management chip U1 is used for charging control detection; the storage inductor L1 is used for charging switch energy storage; the capacitor C3 and the capacitor C4 are used for charging output voltage filtering.

[0013] Optionally, the battery connection circuit includes a battery connection terminal J2. The first pin of the battery connection terminal J2 is connected to the other end of the storage inductor L1, the second pin of the battery connection terminal J2 is connected between the resistor R1 and the resistor R2 and is simultaneously connected to the fourth pin of the charging management chip U1; the third pin of the battery connection terminal J2 is grounded.

[0014] The advantages of the present utility model are:

[0015] In the charging temperature detection, MOS transistor Q1 is added to control the connection between resistor R2 and GND. The connection is only opened during charging to enable over-temperature protection for battery charging. The connection is disconnected in the non-charging state to ensure that there is no direct loop between the battery positive terminal and GND in the shutdown state. It is measured that without MOS transistor Q1 in the shutdown state and with resistor R2 directly connected to GND, the battery leakage current is 44 μA; with MOS transistor Q1 in the shutdown state, the battery leakage current is 2 μA, and the shutdown battery leakage current is significantly reduced. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the main structure of the present utility model. Detailed Implementation Manner

[0017] The present utility model will be further described below in conjunction with specific embodiments. The advantages and features of the present utility model will become clearer as the description progresses. However, these embodiments are merely exemplary and do not constitute any limitation to the scope of the present utility model. Those skilled in the art should understand that modifications or substitutions can be made to the details and forms of the technical solution of the present utility model without departing from the spirit and scope of the present utility model, but such modifications and substitutions all fall within the protection scope of the present utility model.

[0018] Please refer to Figure 1 , the present utility model relates to a circuit for extending the shutdown battery life, including a USB input circuit for USB voltage input; an input filtering circuit for filtering the USB voltage input to stabilize the input voltage; a charging control circuit for charging control detection, charging switch energy storage, and charging output voltage filtering; a charging temperature detection circuit for detecting the battery NTC temperature; and a battery connection circuit for connecting the positive and negative terminals of the battery and the battery NTC.

[0019] Based on the above circuit settings, the present utility model achieves:

[0020] Multi-functional integration: The circuit integrates USB input, filtering, charging control, temperature detection, and battery connection, realizing multiple functions while simplifying the design.

[0021] Efficient charging: The charging control circuit can intelligently manage the charging process of the battery, including controlling the charging switch and energy storage, and filtering out the noise in the charging output voltage to improve the charging efficiency.

[0022] Temperature protection: The charging temperature detection circuit can monitor the battery temperature in real time. Through the NTC temperature sensor and related circuit design, over-temperature protection is achieved to prevent the battery from working at high temperatures and extend the battery life.

[0023] Enhanced stability: The input filtering circuit ensures the stability of the USB input voltage, reducing the impact of voltage fluctuations on the circuit and the battery.

[0024] Safety improvement: The safety of the battery is considered in the circuit design. By temperature detection and control, the risk of battery overheating is reduced.

[0025] Energy saving and consumption reduction: In the shutdown state, the circuit can reduce the self-consumption current of the battery, thereby extending the standby time of the battery.

[0026] The described USB input circuit includes a USB socket J1. The first pin of the USB socket J1 is connected to the input end of the input filtering circuit, and the fourth pin of the USB socket J1 is grounded.

[0027] The described input filtering circuit includes capacitors C1 and C2. The capacitors C1 and C2 are connected in parallel. One end of the capacitor C1 and one end of the capacitor C2 are both connected to the first pin of the USB socket J1 and then connected to the input end of the charging control circuit. The other end of the capacitor C1 and the other end of the capacitor C2 are both grounded.

[0028] The described charging control circuit includes a charging management chip U1, a storage inductor L1, capacitors C3 and C4. The first pin of the charging management chip U1 is connected to one end of the capacitors C1 and C2. The first pin of the charging management chip U1 is also connected to the charging temperature detection circuit. The second pin of the charging management chip U1 is connected to one end of the storage inductor L1. The other end of the storage inductor L1 is connected to one end of the capacitor C3, one end of the capacitor C4, the charging temperature detection circuit, the third pin of the charging management chip U1, and the battery connection circuit. The other ends of the capacitors C3 and C4 are grounded. The fourth pin of the charging management chip U1 is connected to the charging temperature detection circuit and the battery connection circuit. The fifth pin of the charging management chip U1 is grounded.

[0029] The described charging temperature detection circuit includes resistors R1, R2 and a MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the first pin of the charging management chip U1. The source of the MOS transistor Q1 is grounded. The drain of the MOS transistor Q1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the fourth pin of the charging management chip U1, one end of the resistor R1, and the battery connection circuit. The other end of the resistor R1 is connected to the third pin of the charging management chip U1. The charging management chip U1 is used for charging control detection. The storage inductor L1 is used for charging switch energy storage. The capacitors C3 and C4 are used for charging output voltage filtering.

[0030] The described battery connection circuit includes a battery connection terminal J2. The first pin of the battery connection terminal J2 is connected to the other end of the energy storage inductor L1. The second pin of the battery connection terminal J2 is connected between the resistor R1 and the resistor R2 and is simultaneously connected to the fourth pin of the charging management chip U1. The third pin of the battery connection terminal J2 is grounded.

[0031] The working principle of the present utility model is as follows:

[0032] When the present utility model is working, the voltage is input through the USB input circuit and is supplied to the charging management chip U1 after being filtered by the capacitors C1 and C2. The switching signal output from the second pin of the charging control chip U1 is filtered by the energy storage inductor and then used to charge the battery. When the third pin of the charging management chip detects that the battery voltage reaches the set value, the charging stops. When the fourth pin of the charging management chip detects an abnormal battery temperature during charging, the charging stops.

[0033] In the charging temperature detection of the present utility model, an MOS transistor Q1 is added to control the connection between the resistor R2 and GND. Only when charging, the connection is turned on to enable over-temperature protection for battery charging. When not in the charging state, the connection is disconnected to ensure that there is no direct loop between the battery positive electrode and GND in the shutdown state. It is actually measured that without the MOS transistor Q1 in the shutdown state and the resistor R2 directly connected to GND, the battery leakage current is 44 μA; with the MOS transistor Q1 in the shutdown state, the battery leakage current is 2 μA, and the battery leakage current in the shutdown state is significantly reduced.

[0034] As described above, the above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A circuit for extending the battery shutdown endurance, characterized in that Including: A USB input circuit for USB voltage input; An input filter circuit for filtering the USB voltage input to stabilize the input voltage; A charging control circuit for charging control detection, charging switch energy storage, and charging output voltage filtering; A charging temperature detection circuit for detecting the temperature of the battery NTC; A battery connection circuit for connecting the positive and negative electrodes of the battery and the battery NTC.

2. The circuit for extending the battery shutdown endurance according to claim 1, wherein The USB input circuit includes a USB socket J1. The first pin of the USB socket J1 is connected to the input end of the input filter circuit, and the fourth pin of the USB socket J1 is grounded.

3. The circuit for extending the battery shutdown endurance according to claim 2, wherein The input filter circuit includes a capacitor C1 and a capacitor C2. The capacitor C1 and the capacitor C2 are connected in parallel. One end of the capacitor C1 and one end of the capacitor C2 are both connected to the first pin of the USB socket J1 and then connected to the input end of the charging control circuit. The other end of the capacitor C1 and the other end of the capacitor C2 are both grounded.

4. The circuit for extending the battery shutdown endurance according to claim 3, wherein The charging control circuit includes a charging management chip U1, a storage inductor L1, a capacitor C3, and a capacitor C4. The first pin of the charging management chip U1 is connected to one end of the capacitor C1 and the capacitor C2, and the first pin of the charging management chip U1 is also connected to the charging temperature detection circuit; the second pin of the charging management chip U1 is connected to one end of the storage inductor L1, and the other end of the storage inductor L1 is connected to one end of the capacitor C3, one end of the capacitor C4, the charging temperature detection circuit, the third pin of the charging management chip U1, and the battery connection circuit; the other ends of the capacitor C3 and the capacitor C4 are grounded; the fourth pin of the charging management chip U1 is connected to the charging temperature detection circuit and the battery connection circuit; the fifth pin of the charging management chip U1 is grounded.

5. The circuit for extending the battery shutdown endurance according to claim 4, wherein The charging temperature detection circuit includes a resistor R1, a resistor R2, and a MOS transistor Q1. The gate of the MOS transistor Q1 is connected to the first pin of the charging management chip U1, the source of the MOS transistor Q1 is grounded, the drain of the MOS transistor Q1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the fourth pin of the charging management chip U1, one end of the resistor R1, and the battery connection circuit; the other end of the resistor R1 is connected to the third pin of the charging management chip U1. The charging management chip U1 is used for charging control detection; the storage inductor L1 is used for charging switch energy storage; the capacitor C3 and the capacitor C4 are used for charging output voltage filtering.

6. The circuit for extending the battery shutdown endurance according to claim 5, wherein The battery connection circuit includes a battery connection terminal J2. The first pin of the battery connection terminal J2 is connected to the other end of the storage inductor L1. The second pin of the battery connection terminal J2 is connected between the resistor R1 and the resistor R2 and is simultaneously connected to the fourth pin of the charging management chip U1; the third pin of the battery connection terminal J2 is grounded.

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