Ultra-low power consumption single-chip microcomputer power supply circuit based on multi-mode triggering and electric equipment

Abstract

The invention relates to an ultra-low power consumption single-chip microcomputer power supply circuit based on multi-mode triggering and electric equipment. The ultra-low power consumption single-chip microcomputer power supply circuit comprises an upper computer triggering access, a key triggering access, a charging triggering access, an LDO voltage reduction circuit and an MCU unit. The LDO step-down circuit provides voltage to supply power to the MCU unit when being powered on; the upper computer trigger access is controlled by an upper computer to be conducted, the key trigger access is triggered by a key to be conducted, and the charging trigger access is triggered by a charger to be conducted; when any one of the upper computer trigger access, the key trigger access and the charging trigger access is triggered to be conducted, the LDO voltage reduction circuit is powered on; the scheme has the advantages of physical-level zero-power-consumption standby, stable and reliable power supply, flexible and complementary triggering modes, remarkably improved endurance and high reliability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field, in particular to a super-low-power MCU power supply circuit based on multi-mode triggering and a power-consuming device. BACKGROUND

[0002] MCU (Microcontroller Unit) has been widely used in portable electronic devices, IoT (Internet of Things) nodes, sensors and other scenarios. These devices are usually powered by batteries, so power consumption is a key factor determining their endurance. In order to reduce power consumption, modern MCUs generally support multiple low-power modes, such as sleep mode , stop mode and standby mode . In standby mode, the MCU core stops working, only a few wake-up sources (such as RTC, external interrupts) are effective, and the power consumption can be reduced to the level of microampere (μA).

[0003] However, even in standby mode, there is still static current consumption inside the MCU. For application scenarios that require long standby (such as months or even years), the standby current of microampere level will still significantly consume the battery power. For example, a 200mAh battery, if the standby current is 10μA, the theoretical standby time is about 200mAh / 10μA≈2.3 years. But in actual application, the leakage of peripheral circuit, the static power consumption of power management chip, etc. will make the total standby current increase to tens or even hundreds of microamperes, resulting in the actual standby time being shortened to months or weeks, which is difficult to meet the demand of ultra-long standby.

[0004] Therefore, the industry urgently needs a solution that can achieve almost zero power consumption standby and fundamentally eliminate current consumption during standby. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a super-low-power MCU power supply circuit based on multi-mode triggering and a power-consuming device to solve the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the application to solve the technical problem is: A super-low-power MCU power supply circuit based on multi-mode triggering is constructed, which comprises an upper computer triggering path, a key triggering path, a charging triggering path, an LDO voltage reduction circuit and an MCU unit. The LDO voltage reduction circuit is connected with the MCU unit, and the LDO voltage reduction circuit provides voltage for the MCU unit when powered on; The upper computer triggering path is turned on by the upper computer, the key triggering path is turned on by the key, and the charging triggering path is turned on by the charger; When any one of the host computer trigger path, the button trigger path and the charging trigger path is triggered to be turned on, the LDO step-down circuit is powered on.

[0007] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply. The host computer trigger path and the button trigger path are used to control the connection between the power supply and the LDO step-down circuit.

[0008] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply. The first NMOS tube is used to control the connection between the power supply and the LDO step-down circuit. The second NMOS tube is controlled by a host computer and is used to control the connection of the first NMOS tube. The resistance dividing circuit is used to divide the voltage for the second NMOS tube.

[0009] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply.

[0010] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply. One end of the control button is connected to the power supply, and the other end is connected to the anode of the first diode.

[0011] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply.

[0012] The multi-mode trigger based ultra-low power single-chip microcomputer power supply circuit further comprises a power supply. The charging interface is connected with the positive electrode of the second diode, and the negative electrode of the second diode is connected with the input end of the LDO voltage reduction circuit.

[0013] The LDO voltage reduction circuit comprises an LDO voltage reduction chip, a VIN pin of the LDO voltage reduction chip is connected with the host computer trigger path, the button trigger path and the charging trigger path, and a VOUT pin of the LDO voltage reduction chip is connected with the MCU unit.

[0014] The LDO voltage reduction chip is connected with a first capacitor and a fifth resistor, the other end of the first capacitor is grounded, and the other end of the fifth resistor is connected with a CE pin of the LDO voltage reduction chip.

[0015] A kind of electric equipment, wherein, the electric equipment is provided with the above-mentioned based on the power supply circuit of multi-mode trigger ultra-low power consumption single-chip microcomputer.

[0016] The beneficial effects of the application are as follows: 1. Physical level zero power consumption standby: by cutting off the input power of LDO, the MCU and all peripheral circuits are completely powered off when in standby, no standby current is needed, and the current consumption is only the self-discharge of the battery.

[0017] 2. Stable and reliable power supply: the power supply is turned on first, and then the LDO provides pure and stable voltage for the MCU, avoiding the voltage glitch and reset problem caused by directly switching the MCU power supply.

[0018] 3. Flexible and complementary trigger mode: the three trigger mechanisms cover all application scenarios and are independent of each other, with high reliability.

[0019] 4. Significantly improve the endurance: fundamentally eliminate static power consumption, extend the battery standby time to more than several years.

[0020] 5. High reliability: the circuit is realized by pure hardware, without relying on the software low-power mode of the single-chip microcomputer, avoiding the risk of software runaway or configuration error leading to the inability to enter low-power mode, with high stability. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present application will be further described below with reference to the drawings and embodiments; the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings: Figure 1 is a power supply circuit block diagram of a multi-mode trigger-based ultra-low power single-chip microcomputer of a preferred embodiment of the present application; Figure 2 is a circuit diagram of the power supply circuit of the multi-mode trigger-based ultra-low power single-chip microcomputer of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below; obviously, the described embodiments are some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0023] The multi-mode trigger-based ultra-low power single-chip microcomputer power supply circuit of a preferred embodiment of the present application, as shown in Figure 1 , simultaneously referring to Figure 2 , includes an upper computer trigger path 1, a key trigger path 2, a charging trigger path 3, an LDO step-down circuit 4 and an MCU unit 5; The LDO step-down circuit 4 is connected with the MCU unit 5, and the LDO step-down circuit 4 provides voltage for the power supply of the MCU unit 5 when powered on; The upper computer trigger path 1 is controlled to be turned on by the upper computer, the key trigger path 2 is triggered to be turned on by the key, and the charging trigger path 3 is triggered to be turned on by the charger; When any one of the upper computer trigger path 1, the key trigger path 2 and the charging trigger path 3 is triggered to be turned on, the LDO step-down circuit is powered on.

[0024] 1. Physical level zero power standby: by cutting off the input power of the LDO, the MCU and all peripheral circuits are completely powered off when in standby, no standby current is needed, and the current consumption is only the self-discharge of the battery.

[0025] 2. Stable and reliable power supply: the power supply is first turned on, and then the LDO provides pure and stable voltage for the MCU, avoiding voltage glitches and reset problems that may be caused by directly switching the power supply of the MCU.

[0026] 3. Flexible and complementary trigger mode: the three trigger mechanisms cover all application scenarios and are independent of each other, with high reliability.

[0027] 4. Significantly improve the endurance: fundamentally eliminate static power consumption, battery standby time extended to more than a few years.

[0028] 5. High reliability: the circuit is realized by pure hardware, does not depend on the software low power consumption mode of single chip microcomputer, avoids the risk that software runaway or configuration error leads to unable to enter low power consumption mode, and is high in stability.

[0029] The application discloses a kind of ultra-low power consumption single-chip microcomputer power supply systems based on multi-mode trigger, to solve the power consumption problem of single-chip microcomputer in standby state completely.

[0030] System includes battery, LDO step-down chip and the power supply control circuit formed by three independent hardware trigger paths.Three paths are as follows: upper computer control signal trigger path, manual button trigger path and VBUS charging signal trigger path.

[0031] Its core is that the three paths jointly determine the power supply circuit of single-chip microcomputer with "or logic" relationship, only when being triggered, battery voltage or charging voltage is provided to the input end of LDO, and LDO then outputs stable 3.3V to power single-chip microcomputer.

[0032] After any trigger condition disappears, if other trigger conditions are not met, the system will automatically cut off the input power supply of LDO, so that single-chip microcomputer and its peripheral circuit are completely powered off, and the "physical level" shutdown of standby current tends to zero is realized.

[0033] The application can extend battery standby time from a few months to more than a few years by replacing software standby mode with pure hardware.

[0034] Specific circuit can adopt the following circuit, and can be further changed based on the change of conventional circuit elements, and the replacement scheme obtained based on the change of conventional circuit elements also belongs to the protection scope of the application.

[0035] The upper computer trigger path 1 includes a resistance dividing circuit, a first NMOS tube and a second NMOS tube; the resistance dividing circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the G pole of the second NMOS tube Q2 is connected with the first resistor R1 and the second resistor R2, the other end of the first resistor R1 is connected with the upper computer, and the other end of the second resistor R2 is grounded; the S pole of the second NMOS tube Q2 is grounded, and the D pole of the second NMOS tube Q2 is connected with the fourth resistor R4; the other end of the fourth resistor R4 is connected with the G pole of the first NMOS tube Q1, the other end of the third resistor R3 is connected with the power supply VBAT (the power supply can be a battery or the like) and the D pole of the first NMOS tube Q1, and the S pole of the first NMOS tube Q1 is connected with the input end of the LDO step-down circuit 4; Reference Figure 2The upper computer controls through a signal line (CTRL_3.3V). When the upper computer needs to communicate with the device, a high level is output, and the high level makes the NMOS transistor (Q2) in the path conduct through the resistance voltage division circuit, the gate of Q1 is pulled low, and Q1 is turned on.

[0036] The key trigger path 2 includes a control key SW1 and a first diode D1; one end of the control key SW1 is connected to the power supply VBAT, and the other end is connected to the positive electrode of the first diode D1; the negative electrode of the first diode D1 is connected to the input end of the LDO voltage reduction circuit 4; Referring to Figure 2 , pressing SW1 directly connects the battery voltage and the input voltage of the LDO chip. SW1 key can have two choices to adapt to different application scenarios: the first is a light touch key, which is turned on when the key is pressed and is turned off when the key is released, which is matched with the single-chip microcomputer program and the LED power display circuit to display the current battery power value; the second is a latch key to latch the power supply state to realize the function of "light touch start". The switch diode D1 is designed to prevent reverse current.

[0037] The charging trigger path 3 includes a charging interface VBUS and a second diode D2; the charging interface and the positive electrode of the second diode D2 are connected, and the negative electrode of the second diode D2 is connected to the input end of the LDO voltage reduction circuit 4; Referring to Figure 2 , when the charger is inserted and VBUS has power, the LDO chip can be directly powered through the diode D2, and then the LDO outputs a stable voltage (such as 3.3V) to power the MCU. The switch diode D1 is designed to prevent reverse current in the case that the battery voltage and the like are turned on.

[0038] The LDO voltage reduction circuit 4 includes an LDO voltage reduction chip, the VIN pin of the LDO voltage reduction chip is connected to the upper computer trigger path, the key trigger path and the charging trigger path, and the VOUT pin of the LDO voltage reduction chip is connected to the MCU unit; the VIN pin of the LDO voltage reduction chip is the input end of the LDO voltage reduction circuit; the VIN pin of the LDO voltage reduction chip is connected with a first capacitor and a fifth resistor, the other end of the first capacitor is grounded, and the other end of the fifth resistor is connected to the CE pin of the LDO voltage reduction chip; the VOUT pin of the LDO voltage reduction chip is connected with a second capacitor, and the other end of the second capacitor is grounded.

[0039] A kind of electric equipment, wherein, as described above, the electric equipment is provided with the ultra-low power consumption single-chip microcomputer power supply circuit based on multi-mode trigger;Electric equipment can be any specific device in portable electronic device, Internet of Things (IoT) node, sensor and the like scene.

[0040] It is to be understood that all such modifications and variations that can occur to those skilled in the art in the light of the foregoing description are to be considered within the scope of the application as defined in the claims appended hereto.

Claims

1. A multi-mode trigger based ultra-low power microcontroller supply circuit, characterized in that, The upper computer triggering path, the key triggering path, the charging triggering path, the LDO voltage reduction circuit and the MCU unit are included. The LDO voltage reduction circuit is connected with the MCU unit, and provides voltage for the MCU unit when powered on. The upper computer triggering path is controlled to be turned on by the upper computer, the key triggering path is triggered to be turned on by the key, and the charging triggering path is triggered to be turned on by the charger. When any one of the upper computer triggering path, the key triggering path and the charging triggering path is triggered to be turned on, the LDO voltage reduction circuit is powered on.

2. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 1, wherein, The multi-mode triggering based ultra-low power consumption MCU power supply circuit further includes a power supply. The upper computer triggering path and the key triggering path are both used to control the connection between the power supply and the LDO voltage reduction circuit.

3. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 2, wherein, The upper computer triggering path includes a resistance voltage dividing circuit, a first NMOS tube and a second NMOS tube. The first NMOS tube is used to control the connection between the power supply and the LDO voltage reduction circuit. The second NMOS tube is controlled by the upper computer and is used to control the connection of the first NMOS tube. The resistance voltage dividing circuit is used to divide voltage for the second NMOS tube.

4. The multi-mode trigger based ultra-low power single chip microcomputer power supply circuit according to claim 3, characterized in that, The resistance voltage dividing circuit includes a first resistance, a second resistance, a third resistance and a fourth resistance; the G pole of the second NMOS tube is connected with the first resistance and the second resistance, the other end of the first resistance is connected with the upper computer, and the other end of the second resistance is grounded; the S pole of the second NMOS tube is grounded, the D pole of the second NMOS tube is connected with the fourth resistance; the other end of the fourth resistance is connected with the third resistance and the G pole of the first NMOS tube, the other end of the third resistance is connected with the power supply and the D pole of the first NMOS tube, and the S pole of the first NMOS tube is connected with the input end of the LDO voltage reduction circuit.

5. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 2, wherein, The key triggering path includes a control key and a first diode. One end of the control key is connected with the power supply, and the other end is connected with the positive pole of the first diode; the negative pole of the first diode is connected with the input end of the LDO voltage reduction circuit.

6. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 5, wherein, The control key is a light touch key or a latch key.

7. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 1, wherein, The charging triggering path includes a charging interface and a second diode. The charging interface and the positive pole of the second diode are connected, and the negative pole of the second diode is connected with the input end of the LDO voltage reduction circuit.

8. The ultra-low power single chip microcomputer power supply circuit based on multi-mode triggering according to any one of claims 1-7, characterized in that, The LDO voltage reduction circuit includes an LDO voltage reduction chip, the VIN pin of the LDO voltage reduction chip is connected with the upper computer triggering path, the key triggering path and the charging triggering path, the VOUT pin of the LDO voltage reduction chip is connected with the MCU unit, and the VIN pin of the LDO voltage reduction chip is the input end of the LDO voltage reduction circuit.

9. The multi-mode trigger based ultra-low power microcontroller supply circuit according to claim 8, wherein, The VIN pin of the LDO voltage reduction chip is connected with a first capacitor and a fifth resistance, the other end of the first capacitor is grounded, and the other end of the fifth resistance is connected with the CE pin of the LDO voltage reduction chip; the VOUT pin of the LDO voltage reduction chip is connected with a second capacitor, and the other end of the second capacitor is grounded.

10. An electric device, characterized by The power supply circuit based on the multi-mode trigger and the ultra-low power consumption single-chip microcomputer is arranged on the power-using equipment. The power supply circuit based on the multi-mode trigger and the ultra-low power consumption single-chip microcomputer is arranged on the power-using equipment.

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