Low power standby circuit for battery powered devices

Abstract

The utility model discloses a kind of low-power standby circuit for battery equipment, belong to standby circuit technical field, solve the static current power consumption of traditional battery equipment when standby still has greater, when traditional battery equipment is set to standby mode, actually its controller is in low-power mode, system static current is usually milliamper level, equipment long-term warehousing and shipping process clock battery power will be exhausted, and the control circuit of the utility model can make it completely standby (microcontroller does not work), static current is around 1 microampere, after standby, realize lower wake-up power consumption by directly awakening controller through key control circuit, also compatible with wake-up system when charging, standby again when power off, prolong battery service life, and circuit is simple, low in cost.

Description

Technical Field

[0001] This utility model relates to a standby circuit, and more particularly to a low-power standby circuit for battery-powered devices, belonging to the field of standby circuit technology. Background Technology

[0002] With the increasing popularity of portable electronic products, the requirements for standby current are constantly increasing. To improve battery life, consumers want devices to maintain low battery consumption in order to extend standby time and prevent the devices from being unable to be turned on directly after being idle for a long time.

[0003] Traditional batteries still experience static current loss when idle, which not only affects battery life but also increases energy waste. Controlling static current has become a key challenge in the development of battery technology.

[0004] Traditional quiescent current control usually relies on circuit design, which increases the complexity and manufacturing cost of the circuit board to some extent. In contrast, although using a quiescent current chip can improve battery management efficiency, its high cost is also one of the factors that restricts its popularization. Therefore, a low-power standby circuit for battery-powered devices is designed to solve the above problems. Utility Model Content

[0005] The main purpose of this invention is to provide a low-power standby circuit for battery-powered devices.

[0006] The objective of this utility model can be achieved by adopting the following technical solution:

[0007] A low-power standby circuit for a battery-powered device includes a button SW1, one end of which is connected to one end of a resistor R2, the other end of which is electrically connected to one end of a capacitor C3 and one end of a resistor R3, and the other end of the resistor R3 and the other end of the capacitor C3 are grounded.

[0008] Preferably, the other end of resistor R2 is electrically connected to one end of resistor R1 and the anode of diode D1;

[0009] The cathode of diode D1 is electrically connected to the cathodes of diodes D2 and D3, as well as one end of resistor R4.

[0010] Preferably, the cathode of diode D2 is electrically connected to the EN terminal of linear regulator U1, and the GND terminal of linear regulator U1 is electrically connected to one end of capacitor C2.

[0011] Preferably, the VIN terminal of the linear regulator U1 is electrically connected to the other end of the capacitor C2, the OUT terminal of the linear regulator U1 is electrically connected to one end of the capacitor C1, and one end of the GND terminal of the linear regulator U1 is electrically connected to the other end of the capacitor C1.

[0012] Preferably, the other end of resistor R1 is electrically connected to pin 1 of the microcontroller, and the other end of button SW1 is electrically connected to the battery power supply.

[0013] Preferably, one end of capacitor C2 is electrically connected to the battery power supply, and one end of capacitor C1 is electrically connected to the microcontroller.

[0014] The beneficial technical effects of this utility model are as follows:

[0015] This utility model provides a low-power standby circuit for battery-powered devices, which solves the problem that traditional battery-powered devices still have a large static current consumption during standby.

[0016] Traditional battery devices, when set to standby mode, actually have their controllers in a low-power mode, with the system's static current typically in the milliamp range. During long-term storage and shipping, the battery will eventually be depleted. However, the control circuit of this invention allows the device to operate in complete standby mode (with the microcontroller not working), with a static current of around 1 microamp. After standby, the controller can be directly woken up via a button control circuit, achieving lower wake-up power consumption. It is also compatible with waking up the system while charging and resuming standby mode when power is off, extending battery life. Furthermore, the circuit is simple and low-cost. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of a preferred embodiment of a low-power standby circuit for a battery-powered device according to the present invention. Detailed Implementation

[0018] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0019] like Figure 1 As shown, this embodiment provides a low-power standby circuit for a battery-powered device, including a push-button switch SW1, a linear regulator U1, resistors R1, R2, R3, and R4, capacitors C1, C2, and C3, and diodes D1, D2, and D3.

[0020] The first end of the push button switch SW1 is connected to (1), and the second end is connected to the first end of R2;

[0021] The second end of resistor R2 is connected to the first end of resistor R1 and the first end of diode D1, and is grounded through resistor R3 and capacitor C3.

[0022] The second terminal of resistor R1 is connected to (2);

[0023] The first terminal of diode D2 is connected to (3);

[0024] The first terminal of diode D3 is connected to (4);

[0025] Linear regulator U1:

[0026] Pin 1VIN is connected to (1) and then connected to pin 2GND through capacitor C2;

[0027] Pin 3EN is connected to the second terminal of diode D1, the second terminal of diode D2, and the second terminal of diode D3, and is grounded through resistor R4;

[0028] Pin 4OUT is connected to (5) and then connected to pin 5GND through capacitor C1;

[0029] Where (1) is the battery power input;

[0030] (2) is pin 1 of the microcontroller, which monitors when the switch is pressed.

[0031] (3) is pin 2 of the microcontroller, which outputs the enable signal;

[0032] (4) is the external voltage input under battery charging conditions;

[0033] (5) is the power supply input for the microcontroller.

[0034] First, when the equipment is idle or during shipping, the battery and system circuit are physically disconnected by switch SW1, and the system's static current is only the battery's static current, usually around 1uA, which is less than the static current of most chips in low-power mode. After long periods of idleness or shipping, it can still maintain sufficient battery power and can be used directly without charging.

[0035] Secondly, when the button SW1 is pressed for the first time to use the device, the battery voltage enables the linear regulator U1 through the second switching diode, providing power output to the system and activating the system. At the same time, the microcontroller pin 1 determines that the button SW1 has been pressed, and the control pin 2 outputs a high level to enable the linear regulator U1. After the button SW1 is released, the linear regulator U1 can still output the power required by the system.

[0036] Third, when button SW1 is pressed again, the microcontroller pin 1 determines that button SW1 has been pressed again, and the control pin 2 outputs a low level to disable the linear regulator U1. After that, when button SW1 is released, the system can re-enter the low static operating mode.

[0037] Fourth, when the device is charged using an external input voltage, the external voltage can enable the linear regulator U1 through the third switching diode to provide power output to the system and make necessary indications. When the device disconnects the external input voltage, the linear regulator U1 is disabled, and the system can re-enter the low static operating mode.

[0038] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A low-power standby circuit for battery-powered devices, characterized in that: Includes button SW1, one end of button SW1 is connected to one end of resistor R2, the other end of resistor R2 is electrically connected to one end of capacitor C3 and one end of resistor R3, and the other end of resistor R3 and the other end of capacitor C3 are grounded. The other end of resistor R2 is electrically connected to one end of resistor R1 and the anode of diode D1; The cathode of diode D1 is electrically connected to the cathodes of diodes D2 and D3, as well as one end of resistor R4. The cathode of diode D2 is electrically connected to the EN terminal of linear regulator U1, and the GND terminal of linear regulator U1 is electrically connected to one end of capacitor C2. The VIN terminal of the linear regulator U1 is electrically connected to the other end of the capacitor C2, the OUT terminal of the linear regulator U1 is electrically connected to one end of the capacitor C1, and one end of the GND terminal of the linear regulator U1 is electrically connected to the other end of the capacitor C1. The other end of resistor R1 is electrically connected to pin 1 of the microcontroller, and the other end of button SW1 is electrically connected to the battery power supply. One end of capacitor C2 is electrically connected to the battery power supply, and one end of capacitor C1 is electrically connected to the microcontroller.

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