CN221406350U - Ultra-low power consumption on-off control system of electronic product - Google Patents

Abstract

The utility model relates to the technical field of embedded software and hardware design, in particular to an ultra-low power consumption on-off control system of an electronic product. The system consists of a singlechip circuit, a switch control circuit and a system power supply circuit, wherein the singlechip circuit adopts an STM32L431RCT6 singlechip, and the system power supply circuit adopts a TPS62152RGTR chip. The utility model aims to solve the problems in the prior art, and provides an ultra-low power consumption on-off control system of an electronic product, which utilizes the unidirectional conductivity of a diode, the output level of a processor IO and a resistor to provide working current, thereby realizing an on-off control method with ultra-low power consumption.

Description

Ultra-low power consumption on-off control system of electronic product

Technical Field

The utility model relates to the technical field of embedded software and hardware design, in particular to an ultra-low power consumption on-off control system of an electronic product.

Background

Conventional electronic products require a power-on/off control button or switch for turning on or off the entire system. There are two common on-off control methods: the mechanical switch directly turns off the power supply; a dedicated on-off control chip is used.

The traditional control method for directly controlling the power supply loop by the mechanical switch is the simplest, but because the switch is a fluctuation type mechanical contact, after long-term working aging, the contact resistance is increased, heat is generated under the influence of starting current, the heat is generated, and the contact resistance is further increased, so that the malignant cycle is entered, the mechanical switch is quickly overheated and burnt out, and meanwhile, the mechanical switch is large in size and cannot be widely used in miniature electronic products.

The special on-off control chip is usually composed of a micro switch and a special chip, and has the advantages that the traditional fluctuation type mechanical switch is replaced by a micro button switch, only control signals are generated, system current does not flow through the switch, and the on-off of the current is controlled by the special chip, so that the miniaturization and long service life of the switch are realized, but the special chip is required to be added, the cost is high, and the extra circuit board area is occupied.

Disclosure of utility model

The utility model aims to solve the problems in the prior art, and provides an ultra-low power consumption on-off control system of an electronic product, which utilizes the unidirectional conductivity of a diode, the output level of a processor IO and a resistor to provide working current, thereby realizing an on-off control method with ultra-low power consumption.

The technical scheme adopted by the utility model is as follows: the electronic product ultra-low power consumption on-off control system comprises a singlechip circuit, an on-off control circuit and a system power supply circuit, wherein the singlechip circuit adopts an STM32L431RCT6 singlechip, and the system power supply circuit adopts a TPS62152RGTR chip.

As a further improvement of the utility model, the PA3 of the singlechip circuit is arranged that an input pin is connected with the WAKEUP of the on-off control circuit for detecting whether the SW1 switch is pressed or not; the PA4 of the singlechip circuit is arranged that an output pin is connected with the SYS_POWER_EN and is simultaneously connected with the pin EN of the system POWER supply circuit U3 for POWER-on self-locking control; the power supply of the singlechip circuit is accessed by VBAT, and is simultaneously supplied to PVIN pins of the on-off control circuit and the system power circuit, and is connected to the voltage stabilizing output VDD-3V3 of the system power circuit.

As a further improvement of the utility model, R5 in the switching on/off control circuit is 470 omega resistor, and provides a pull-up high level for the control logic; SW1 in the on-off control circuit is a button micro switch, and provides an input trigger operation device for control logic; c11 in the switching control circuit is 0.1uF/50V/X7R capacitor, a filtering function is provided for jitter possibly generated by switching trigger, R7 in the switching control circuit is 390K resistor, a current discharging channel is provided for C11 when a button operation is not executed, D1 and D2 in the switching control circuit are diodes, and unidirectional conductivity is utilized for providing control logic and isolation for the switching control circuit.

As a further improvement of the utility model, the system power supply circuit comprises an input end Pvin connected to the system power supply VBAT, and the system power supply VBAT outputs a stable 3.3V power supply to the singlechip circuit after being transformed by an inductor L1 and filtered by a capacitor C9.

The utility model has the beneficial effects that: when the utility model does not have the on-off operation, the circuit diagram shows that the utility model does not consume any current, can greatly prolong the standby time of the system, has the operation logic consistent with the conventional special chip scheme when in the on-off operation, accords with the daily operation habit, has the cost of 2 diodes and 2 resistors, has lower cost and better economy and performance.

Drawings

Fig. 1 is a circuit diagram of an ultra-low power consumption on-off control system of an electronic product.

Detailed Description

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible mentioned in this specification are defined with respect to their construction, and they are relative concepts. Therefore, the position and the use state of the device can be changed correspondingly according to different positions; these and other directional terms should not be construed as limiting terms.

As used in this specification, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The utility model provides an ultra-low power consumption on-off control system of an electronic product as shown in figure 1, which consists of a singlechip circuit, an on-off control circuit and a system power supply circuit, wherein the singlechip circuit adopts an STM32L431RCT6 singlechip, and the system power supply circuit adopts a TPS62152RGTR chip.

As shown in fig. 1, PA3 of the singlechip circuit is set to have an input pin connected with wake up of the on-off control circuit for detecting whether the SW1 switch is pressed; the PA4 of the singlechip circuit is arranged that an output pin is connected with the SYS_POWER_EN and is simultaneously connected with the pin EN of the system POWER supply circuit U3 for POWER-on self-locking control; the power supply of the singlechip circuit is accessed by VBAT, and is simultaneously supplied to PVIN pins of the on-off control circuit and the system power circuit, and is connected to the voltage stabilizing output VDD-3V3 of the system power circuit.

As shown in fig. 1, R5 in the on-off control circuit of the present utility model is 470 Ω resistor, providing a pull-up high level for the control logic; SW1 in the on-off control circuit is a button micro switch, and provides an input trigger operation device for control logic; c11 in the switching control circuit is 0.1uF/50V/X7R capacitor, a filtering function is provided for jitter possibly generated by switching trigger, R7 in the switching control circuit is 390K resistor, a current discharging channel is provided for C11 when a button operation is not executed, D1 and D2 in the switching control circuit are diodes, and unidirectional conductivity is utilized for providing control logic and isolation for the switching control circuit.

As shown in FIG. 1, the system power supply circuit of the present utility model comprises an input end Pvin connected to a system power supply VBAT, and the system power supply VBAT outputs a stable 3.3V power supply to the singlechip circuit after being transformed by an inductor L1 and filtered by a capacitor C9.

Working principle:

Logic when not operating: before the power-on button is pressed, the battery voltage VBAT supplies power to the pull-up resistor R5 of the button switch and simultaneously supplies power to the system power circuit U3, but because the button switch is not pressed, the D1 and the D2 have no voltage, the Pin Pin13 of the U3 is pulled down to a low level by the R6, the U5 does not work, the VDD3.3 does not have power, the singlechip does not work, and the whole power consumption of the system is the dormant static power consumption of the U3.

Starting logic: when the POWER-on is intended, the SW1 is pressed down, the VBAT provides working current through the R5, the working current is high after being divided by the R7, the SYS_POWER_EN level on the right side of the D2 is high because of the unidirectional conductivity of the diode, the U3 starts to work, the VDD-3V3 is output, and the processor is powered on to work. Meanwhile, the processor detects that the right WAKEUP of the D1 is at a high level, the judging switch is pressed to start, software outputs the PA3 hardware to be at the high level, and the self-locking is realized by starting, at the moment, even if the SW1 is released, the SYS_POWER_EN is pulled high by the processor to self-lock, the system continuously works and cannot be powered down, so that the starting is realized.

Shutdown logic: in the on state, when SW1 is not pressed, because the unidirectional conductivity of the diode is high, even though the processor pulls up sys_power_en to self-lock, the voltage of R7 is 0V, so D1 has no driving voltage, the right wake is low, when the POWER is off, only SW1 needs to be pressed down, R5 provides working current through the switch, the voltage is high after being divided by R7, the processor detects that the wake level changes from low to high because of the unidirectional conductivity of the diode, the right wake of D1 is high, the processor judges that the POWER is off command, and the PA3 hardware is output to low level contact self-lock through software, at this time, because the right sys_power_en level of D2 is still high, the system still has electricity, but when SW1 is released, all driving sources disappear, sys_power_en becomes low, the U3 stops working, and the whole system returns to the original ultra-low POWER consumption standby state.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the previous embodiment can be modified or part of technical features can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (4)

1. The electronic product ultra-low power consumption on-off control system consists of a singlechip circuit, an on-off control circuit and a system power supply circuit, and is characterized in that: the singlechip circuit adopts an STM32L431RCT6 singlechip, and the system power supply circuit adopts a TPS62152RGTR chip.

2. The electronic product ultra-low power on-off control system according to claim 1, wherein: the PA3 of the singlechip circuit is arranged such that an input pin is connected with a WAKEUP of the on-off control circuit and used for detecting whether the SW1 switch is pressed; the PA4 of the singlechip circuit is arranged to be connected with the SYS_POWER_EN through an output pin and is simultaneously connected with the EN of the system POWER supply circuit U3 for POWER-on self-locking control; the power supply of the singlechip circuit is accessed by VBAT, and is simultaneously supplied to PVIN pins of the on-off control circuit and the system power circuit, and is connected to the voltage stabilizing output VDD-3V3 of the system power circuit.

3. The electronic product ultra-low power on-off control system according to claim 1, wherein: r5 in the on-off control circuit is 470 omega resistor, and provides a pull-up high level for control logic; SW1 in the on-off control circuit is a button micro switch, and provides an input trigger operation device for control logic; the on-off control circuit is characterized in that C11 is 0.1uF/50V/X7R capacitor, a filtering function is provided for jitter possibly generated by switching trigger, R7 is 390K resistor in the on-off control circuit, a current discharging channel is provided for C11 when a button is not operated, D1 and D2 in the on-off control circuit are diodes, and unidirectional conductivity is utilized to provide control logic and isolation for the on-off control circuit.

4. The electronic product ultra-low power on-off control system according to claim 1, wherein: the system power supply circuit comprises an input end Pvin connected to a system power supply VBAT, and the system power supply VBAT outputs a stable 3.3V power supply to the singlechip circuit after being converted by an inductor L1 and filtered by a capacitor C9.