Energy-saving on-off circuit of battery power supply product
By simplifying circuit design and using switch-off control of MCU, MOS tube and other components, the problem of large space and high cost of power management circuits is solved, and low-cost, low-power consumption and long-life battery-powered products are realized.
Patent Information
- Application Number
- CN202422584113.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-25
AI Technical Summary
Existing power management switch circuits take up a lot of space, cost and have high standby power consumption in portable electronic devices, making them unable to meet the needs of low-cost and space-constrained applications.
Using a simplified circuit design, using commonly available electronic components such as MCU, MOS tube and power chip, the output of high and low levels through the button control circuit, combined with voltage sampling and power management modules to realize the power switch control.
Reduces production costs, improves power usage efficiency, reduces standby power consumption, extends battery life, and provides a simple user experience.
Smart Images
Figure CN223296353U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of battery-powered design, and in particular relates to an energy-saving on / off circuit for a battery-powered product. Background Art
[0002] Power management is a critical area in the development of battery-powered products, especially with the increasing popularity of portable electronic devices such as mobile phones, laptops, and smartwatches. These products often require the ability to power on and off efficiently to conserve power and extend battery life. Traditional power management solutions often rely on external power management units (PMUs). These units integrate complex power control logic and enable precise power management, but they are typically costly, occupy a large space, and require more circuit design, which increases system complexity and overall cost.
[0003] For low-cost or space-constrained applications, such as some consumer electronics and IoT devices, a simple, low-cost on / off circuit that can effectively reduce standby power consumption is particularly important.
[0004] Existing solutions use a microcontroller (MCU) power on / off circuit to control the power on / off of the power supply, but do not specifically emphasize reducing costs and standby power consumption by simplifying the circuit.
[0005] Therefore, a new switching circuit design scheme is needed that can reduce production costs and improve energy efficiency by simplifying circuit design and using commonly available electronic components. Utility Model Content
[0006] The purpose of this application is to provide an energy-saving power on / off circuit for a battery-powered product to solve the problem that existing power management switch circuits occupy a large space and are high in cost.
[0007] The technical solution of the present application is: an energy-saving on / off circuit for a battery-powered product, comprising an MCU, a button, a power supply circuit, a control circuit, and a power chip; the input end of the MCU is connected to the power chip, and the output end is connected to the control circuit; the output end of the power circuit is connected to the control circuit, and the power circuit is used to supply power to the control circuit; the button is connected to the control circuit, and different positions of the button can drive the control circuit to output different high and low voltages; the power chip is connected between the power circuit and the MCU to achieve voltage control;
[0008] The control circuit includes a first MOS transistor, a first resistor, a second MOS transistor, a second resistor, and a first diode; the gate of the first MOS transistor is connected to both the MCU and the power supply circuit, the source is grounded, and the drain is connected to the gate of the second MOS transistor; one end of the first resistor is connected to the gate of the first MOS transistor, and the other end is connected to the output interface of the MCU; the drain of the second MOS transistor is connected to the power chip, and the source is connected to the power supply circuit; the second resistor is connected between the gate and source of the second MOS transistor and is used to control the gate voltage of the second MOS transistor; the anode of the first diode is connected to the drain of the first MOS transistor, and the cathode is connected to a key; the first MOS transistor is an N-type MOS transistor, and the second MOS transistor is a P-type MOS transistor.
[0009] Preferably, one side of the button is grounded, and the other side is connected to the cathode of the first diode; the button is also connected to a shutdown circuit, and the shutdown circuit includes a second diode and a fourth resistor; the positive pole of the second diode is connected to pin 39 of the MCU, and the negative pole is connected to the button; one end of the fourth resistor is connected to the positive pole of the second diode, and the other end is connected to the power interface of the MCU; pin 39 of the MCU is an input interface.
[0010] Preferably, a voltage sampling module is further provided between the second MOS tube and the power chip, and the voltage sampling module includes a fifth resistor, a sixth resistor and a first capacitor; one end of the fifth resistor is connected to the drain of the second MOS tube, and the other end is connected to pin 14 of the MCU, and an ADC module is provided in pin 14; one end of the sixth resistor is grounded, and the other end is connected to pin 14 of the MCU; the first capacitor and the sixth resistor are connected in parallel.
[0011] Preferably, the power supply circuit includes a battery and a voltage detection chip arranged in parallel, one end of the battery and pin 5 of the voltage detection chip are connected to the VBAT network, the other end of the battery and pin 4 of the voltage detection chip are grounded, and pin 1 of the voltage detection chip is connected to the gate of the first MOS tube.
[0012] The energy-saving power on / off circuit of the battery-powered product of this application has significant advantages in cost, power efficiency, production maintenance, battery life and user experience through innovative circuit design and program logic. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.
[0014] Figure 1 This is a schematic diagram of the overall circuit structure of this application;
[0015] Figure 2This is a schematic diagram of the power chip structure of this application;
[0016] Figure 3 This is a schematic diagram of the MCU structure of this application.
[0017] 1. MCU; 2. Button; 3. Battery; 4. Voltage detection chip; 5. Power chip; 6. First MOS tube; 7. First resistor; 8. Second MOS tube; 9. Second resistor; 10. First diode; 11. Third resistor; 12. Second diode; 13. Fourth resistor; 14. Fifth resistor; 15. Sixth resistor; 16. First capacitor. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] An energy-saving on / off circuit for battery-powered products, such as Figure 1-Figure 3 As shown, the system includes an MCU1, a button 2, a power supply circuit, a control circuit, and a power chip 5. The MCU1's input is connected to the power chip 5, and its output is connected to the control circuit. The power supply circuit's output is connected to the control circuit, which supplies power to the control circuit. The button 2 is connected to the control circuit, and different positions of the button 2 can drive the control circuit to output different high and low voltage levels. The power chip 5 is connected between the power supply circuit and the MCU1 to achieve voltage control.
[0020] The control circuit includes a first MOS transistor 6, a first resistor 7, a second MOS transistor 8, a second resistor 9, and a first diode 10. The gate of the first MOS transistor 6 is connected to both the MCU 1 and the power supply circuit, the source is grounded, and the drain is connected to the gate of the second MOS transistor 8. One end of the first resistor 7 is connected to the gate of the first MOS transistor 6, and the other end is connected to pin 38 of the MCU 1. Pin 38 is used for voltage output and serves as an output interface. A third resistor 11 is also provided between the gate of the first MOS transistor 6 and ground. The drain of the second MOS transistor 8 is connected to the power supply chip 5, and the source is connected to the power supply circuit. The second resistor 9 is connected between the gate and source of the second MOS transistor 8 and is used to control the gate voltage of the second MOS transistor 8. The anode of the first diode 10 is connected to the drain of the first MOS transistor 6, and the cathode is connected to the key 2, for receiving the key 2 signal. The first MOS transistor 6 is an N-type MOS transistor, and the second MOS transistor 8 is a P-type MOS transistor. One side of the key 2 is grounded, and the other side is connected to the cathode of the first diode 10.
[0021] When button 2 is pressed, the cathode of the diode is grounded, pulling down the anode of the diode, causing the gate of second MOS transistor 8 to reach a low level, turning on second MOS transistor 8. At this point, power chip 5 outputs 3.3V, connecting the power supply circuit and supplying power to MCU1. Pin 38 of MCU1 outputs a high level. The gate of first MOS transistor 6 reaches a high level through pin 38 of MCU1, turning on and grounding it. This causes the gate of second MOS transistor 8 to remain at a low level, keeping it on and powered on, keeping the entire device powered on.
[0022] Preferably, a shutdown circuit is also connected to button 2. The shutdown circuit includes a second diode 12 and a fourth resistor 13. The anode of the second diode 12 is connected to pin 39 of the MCU 1, and the cathode is connected to button 2. One end of the fourth resistor 13 is connected to the anode of the second diode 12, and the other end is connected to the power interface of the MCU 1. Pin 39 of the MCU 1 is an input interface.
[0023] After powering on, by long pressing button 2, pin 39 of MCU1 detects that the voltage is continuously pulled down, thereby outputting a low level to pin 38 of MCU1. The gate of the first MOS tube 6 is at a low level and is not conductive, so that the gate of the second MOS tube 8 is at a high level and is also not conductive. MCU1 cannot be powered and the device shuts down.
[0024] Preferably, a voltage sampling module is further provided between the second MOS transistor 8 and the power chip 5. The voltage sampling module includes a fifth resistor 14, a sixth resistor 15, and a first capacitor 16. One end of the fifth resistor 14 is connected to the drain of the second MOS transistor 8 and the other end is connected to pin 14 of the MCU 1. Pin 14 includes an ADC module, i.e., a digital-to-analog conversion module. One end of the sixth resistor 15 is grounded and the other end is connected to pin 14 of the MCU 1. The first capacitor 16 and the sixth resistor 15 are connected in parallel.
[0025] When second MOS transistor 8 is turned on, the voltage of battery 3 in the power supply circuit is divided by fifth resistor 14 and sixth resistor 15 and input to pin 14 of MCU1. When pin 14 of MCU1 detects that the voltage of battery 3 is greater than or equal to 6.8V, pin 38 of MCU1 continuously outputs a high level to maintain the power-on state. When pin 14 of MCU1 detects that the voltage of battery 3 is less than 6.8V, pin 38 of MCU1 continuously outputs a low level, actively shutting down the device to prevent leakage and over-discharge.
[0026] Preferably, the power supply circuit includes a battery 3 and a voltage detection chip 4 arranged in parallel. One end of the battery 3 and pin 5 of the voltage detection chip 4 are connected to the VBAT network, the other end of the battery 3 and pin 4 of the voltage detection chip 4 are grounded, and pin 1 of the voltage detection chip 4 is connected to the gate of the first MOS transistor 6. Pin 5 of the voltage detection chip 4 is used for voltage detection. When the voltage of the battery 3 is detected to be lower than 6V, pin 1 of the voltage detection chip 4 outputs a low level, pulling down the gate of the first MOS transistor 6, causing the first MOS transistor 6 to be non-conductive. Then, the gate of the second MOS transistor 8 is pulled up through the second resistor 9, causing the second MOS transistor 8 to be non-conductive, resulting in no power to the MCU 1 and the device shutting down, thereby achieving automatic shutdown when the battery 3 is low in power.
[0027] Pin 1 of the power chip 5 is connected to the power interface of the MCU1. After receiving the power from the battery 3 through the second MOS transistor 8, the power chip 5 outputs a current of a specific voltage to the MCU1, so that the MCU1 can continuously output a high level to the gate of the first MOS transistor 6 to achieve power supply; after not receiving the power from the battery 3, the power chip 5 outputs a low level to the MCU1, and the MCU1 continuously outputs a low level to the gate of the first MOS transistor 6 to achieve shutdown.
[0028] Through the above design, this application has the following advantages:
[0029] 1. Simplify circuit design and reduce costs:
[0030] Existing technologies typically rely on expensive external power management units (PMUs) that integrate complex power control logic.
[0031] This application simplifies the circuit design, avoids the use of expensive external PMUs, and utilizes commonly available electronic components such as MOS tubes and microcontrollers (MCUs) to achieve efficient power on / off control.
[0032] 2. Improve the power efficiency of the product:
[0033] The existing technology cannot effectively reduce leakage power consumption in standby mode, which limits the service life of the battery.
[0034] This application effectively reduces leakage power consumption during standby mode by optimizing circuits and program logic. When the device is turned on, power is supplied by a button and MOSFET conduction, while when the device is turned off, the MCU completely disconnects the battery from the system, minimizing leakage power consumption.
[0035] 3. Simplify production maintenance:
[0036] The circuit design of the present application is simple and easy to implement and maintain, which not only reduces production costs but also makes the product more reliable and durable.
[0037] 4. Extend battery life:
[0038] In the prior art, the battery continues to consume power when in standby mode for a long time, which affects the battery life.
[0039] This application uses a long press of the button to enable the MCU to detect a continuous low-level signal and then turn off the MOS tube, completely disconnecting the battery from the system, further extending the battery life.
[0040] 5. Improve user experience:
[0041] Existing technologies require complex operations to achieve power management.
[0042] This application can turn on and off the device completely through simple button operations, providing a better user experience.
[0043] In summary, compared with the best existing technologies, this application has significant advantages in cost, power efficiency, production maintenance, battery life and user experience through innovative circuit design and program logic.
[0044] Finally, it should be noted that the drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.
[0045] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. An energy-saving on / off circuit for a battery-powered product, characterized by: The invention comprises an MCU (1), a button (2), a power supply circuit, a control circuit and a power chip (5); the input end of the MCU (1) is connected to the power chip (5), and the output end is connected to the control circuit; the output end of the power circuit is connected to the control circuit, and the power circuit is used to supply power to the control circuit; the button (2) is connected to the control circuit, and the button (2) can drive the control circuit to output different high and low levels at different positions; the power chip (5) is connected between the power supply circuit and the MCU (1) and is used to realize voltage control; The control circuit comprises a first MOS tube (6), a first resistor (7), a second MOS tube (8), a second resistor (9) and a first diode (10); the gate of the first MOS tube (6) is simultaneously connected to the MCU (1) and the power supply circuit, the source is grounded, and the drain is connected to the gate of the second MOS tube (8); one end of the first resistor (7) is connected to the gate of the first MOS tube (6), and the other end is connected to the output interface of the MCU (1); the drain of the second MOS tube (8) is connected to the power chip (5), and the source is connected to the power supply circuit; the second resistor (9) is connected between the gate and source of the second MOS tube (8) and is used to control the gate voltage of the second MOS tube (8); the positive electrode of the first diode (10) is connected to the drain of the first MOS tube (6), and the negative electrode is connected to the key (2); the first MOS tube (6) is an N-type MOS tube, and the second MOS tube (8) is a P-type MOS tube.
2. The energy-saving on / off circuit for a battery-powered product according to claim 1, wherein: One side of the button (2) is grounded, and the other side is connected to the cathode of the first diode (10); the button (2) is also connected to a shutdown circuit, which includes a second diode (12) and a fourth resistor (13); the anode of the second diode (12) is connected to pin 39 of the MCU (1), and the cathode is connected to the button (2); one end of the fourth resistor (13) is connected to the anode of the second diode (12), and the other end is connected to the power interface of the MCU (1); pin 39 of the MCU (1) is an input interface.
3. The energy-saving on / off circuit for a battery-powered product according to claim 1, wherein: A voltage sampling module is further provided between the second MOS tube (8) and the power chip (5), the voltage sampling module comprising a fifth resistor (14), a sixth resistor (15) and a first capacitor (16); one end of the fifth resistor (14) is connected to the drain of the second MOS tube (8), and the other end is connected to pin 14 of the MCU (1), wherein an ADC module is provided in pin 14; one end of the sixth resistor (15) is grounded, and the other end is connected to pin 14 of the MCU (1); the first capacitor (16) and the sixth resistor (15) are connected in parallel.
4. The energy-saving on / off circuit for a battery-powered product according to claim 1, wherein: The power supply circuit comprises a battery (3) and a voltage detection chip (4) arranged in parallel, one end of the battery (3) and pin 5 of the voltage detection chip (4) are connected to a VBAT network, the other end of the battery (3) and pin 4 of the voltage detection chip (4) are grounded, and pin 1 of the voltage detection chip (4) is connected to the gate of a first MOS tube (6).