A power supply circuit and a low-power-consumption standby implementation method using the same

Abstract

The application relates to a power supply circuit and a low-power standby realization method applying the same, which comprises a first photoelectric coupler U1, a first micro control unit MCU1, a second micro control unit MCU2 and a second photoelectric coupler U2; the first micro control unit MCU1 is connected to the first photoelectric coupler U1; the second micro control unit MCU2 is connected to the first photoelectric coupler U1; the first micro control unit MCU1 is connected to the second photoelectric coupler U2; the second micro control unit MCU2 is connected to the second photoelectric coupler U2; and the RXD2 pin of the second micro control unit MCU2 is kept without pulse signals for a period of time to enter the power saving mode and realize the power saving function.

Description

TECHNICAL FIELD

[0001] The present application relates to a switching device circuit technology field, more particularly, to a power supply circuit and a low-power standby implementation method using the same. BACKGROUND

[0002] At present, the controller basically uses a relay control scheme to control strong electricity. The scheme is simple and practical, but has problems such as large occupied space, service life, and cost.

[0003] With the development of technology, in the occasion of low current, photoelectric coupler and related circuit gradually replace the relay technology, for example, the State Intellectual Property Office discloses a patent application number: CN201922001397.7, the invention name is: a kind of low standby power circuit structure using switching device photoelectric coupler realizes super, the technical scheme is: the low standby power circuit structure includes host computer, photoelectric coupler U13, PMOS tube Q8 and main control board low-voltage power supply, the control signal output end of host computer and the input end positive of photoelectric coupler U13 electrically connected, the output end of photoelectric coupler U13 connects one end of PMOS tube Q8, the other end of PMOS tube Q8 connects main control board low-voltage power supply. The technology used improves the reliability of the product to some extent, the PCB uses small space, but still uses some peripheral devices to realize, to some extent, causes waste resources;In addition, the photoelectric coupler is used to control the total power supply of slave (strong electricity part), so as to reduce the total power consumption in standby state. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a power supply circuit with power saving function, which can automatically wake up and enter working state when external signal changes, and a low-power standby implementation method using the same.

[0005] According to the power supply circuit of the present application, the VDD1 pin and TXD1 pin of the first micro control unit MCU1 are connected to the 1 pin and 2 pin of the first photoelectric coupler U1 respectively, the VCC pin and RXD2 pin of the second micro control unit MCU2 are connected to the 4 pin of the first photoelectric coupler U1, and the HGND1 pin of the second micro control unit MCU2 is connected to the 3 pin of the first photoelectric coupler U1.

[0006] The VDD2 pin and RXD1 pin of the first micro control unit MCU1 are connected to the 1 pin of the second optocoupler U2, the GND pin of the first micro control unit MCU1 is connected to the 2 pin of the second optocoupler U2, the TXD2 pin of the second micro control unit MCU2 is connected to the 4 pin of the second optocoupler U2, and the HGND2 pin of the second micro control unit MCU2 is connected to the 3 pin of the second optocoupler U2.

[0007] The power supply circuit is configured to perform the following low-power standby control method:

[0008] The power supply circuit working state: the TXD1 pin of the first micro control unit MCU1 sends relevant control information to the second micro control unit MCU2, and the second micro control unit MCU2 returns information to the first micro control unit MCU1 through the TXD2 pin of the second micro control unit MCU2 according to the current control state, and the first micro control unit MCU1 and the second micro control unit MCU2 are in working state.

[0009] The power supply circuit shutdown state: the TXD1 pin of the first micro control unit MCU1 stops sending signals, so that no voltage drop is generated on the first optocoupler U1, the RXD2 pin of the second micro control unit MCU2 continuously has no pulse signal for a period of time, the second micro control unit MCU2 enters the power saving mode, the TXD2 pin of the second micro control unit MCU2 outputs low level, so that no voltage drop is generated on the second optocoupler U2, and the first micro control unit MCU1 enters the power saving mode.

[0010] The power supply circuit wake-up state: when the first micro control unit MCU1 detects a working signal, it sends a signal to the second micro control unit MCU2 through the TXD1 pin of the first micro control unit MCU1, and the second micro control unit MCU2 enters working state immediately after detecting a change in the RXD2 pin level.

[0011] In particular, a first resistor R1 is connected between the TXD1 pin of the first micro control unit MCU1 and the 2 pin of the first optocoupler U1.

[0012] In particular, a second resistor R2 is connected between the VDD2 pin of the first micro control unit MCU1 and the 1 pin of the second optocoupler U2.

[0013] In particular, a third resistor R3 is connected between the VCC pin of the second micro control unit MCU2 and the 4 pin of the first optocoupler U1.

[0014] In particular, a fourth resistor R4 is connected between the TXD2 pin of the second micro control unit MCU2 and the 4 pin of the second optocoupler U2.

[0015] Specifically further, in the working state, the TXD1 pin of the first micro control unit MCU1 outputs a pulse signal, and the TXD2 pin of the second micro control unit MCU2 outputs a pulse signal.

[0016] Specifically further, in the shutdown state, the first resistor R1 and the first optocoupler U1 are in a non-energy consumption state.

[0017] Specifically further, the RXD2 pin of the second micro control unit MCU2 is in a state of no pulse signal for a period of time, so as to avoid frequent wake-up of the second micro control unit MCU2.

[0018] Specifically further, the first optocoupler U1 and the second optocoupler U2 are in a working state, or the first optocoupler U1 and the second optocoupler U2 are in a power saving state.

[0019] The power circuit has the advantages that: the second micro control unit MCU2 is in a power saving mode through the RXD2 pin of the second micro control unit MCU2 for a period of time, so as to play a power saving function, and the second micro control unit MCU2 can automatically wake up and enter a working state when detecting that the level of the RXD2 pin changes; in addition, the power circuit does not need an additional circuit, so that the manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0021] Figure 1 is a circuit diagram of the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same reference numerals throughout. The embodiments described below are exemplary only, and are not intended to limit the present application.

[0023] Reference will now be made to Figure 1 A power circuit with low power standby according to an embodiment of the present application is described below, which comprises a first optocoupler U1, a first micro control unit MCU1, a second micro control unit MCU2 and a second optocoupler U2, the VDD1 pin and the TXD1 pin of the first micro control unit MCU1 are connected to the 1 pin and the 2 pin of the first optocoupler U1 respectively, the VCC pin and the RXD2 pin of the second micro control unit MCU2 are connected to the 4 pin of the first optocoupler U1, and the HGND1 pin of the second micro control unit MCU2 is connected to the 3 pin of the first optocoupler U1.

[0024] The VDD2 pin and RXD1 pin of the first micro control unit MCU1 are connected to the 1 pin of the second optocoupler U2, the GND pin of the first micro control unit MCU1 is connected to the 2 pin of the second optocoupler U2, the TXD2 pin of the second micro control unit MCU2 is connected to the 4 pin of the second optocoupler U2, and the HGND2 pin of the second micro control unit MCU2 is connected to the 3 pin of the second optocoupler U2.

[0025] Further, a first resistor R1 is connected between the TXD1 pin of the first micro control unit MCU1 and the 2 pin of the first optocoupler U1. The first resistor R1 functions to limit the working current and protect the first optocoupler U1.

[0026] Further, a second resistor R2 is connected between the VDD2 pin of the first micro control unit MCU1 and the 1 pin of the second optocoupler U2. The second resistor R2 functions to limit the current and protect the first optocoupler U1 from damage.

[0027] Further, a third resistor R3 is connected between the VCC pin of the second micro control unit MCU2 and the 4 pin of the first optocoupler U1. The third resistor R3 protects the first optocoupler U1 from damage.

[0028] Further, a fourth resistor R4 is connected between the TXD2 pin of the second micro control unit MCU2 and the 4 pin of the second optocoupler U2. The fourth resistor R4 protects the second optocoupler U2 from damage.

[0029] The application discloses a low-power standby implementation method of the power supply circuit.

[0030] The working state of the power supply circuit: the TXD1 pin of the first micro control unit MCU1 sends relevant control information to the second micro control unit MCU2, and meanwhile, the second micro control unit MCU2 feeds back information to the first micro control unit MCU1 through the TXD2 pin of the second micro control unit MCU2 according to the current control state, so that the first micro control unit MCU1 and the second micro control unit MCU2 are in the working state.

[0031] The power-off state of the power supply circuit: the TXD1 pin of the first micro control unit MCU1 stops sending signals, so that no voltage drop is generated on the first optocoupler U1, the RXD2 pin of the second micro control unit MCU2 continuously has no pulse signal for a period of time, the second micro control unit MCU2 enters the power saving mode, the TXD2 pin of the second micro control unit MCU2 outputs a low level, so that no voltage drop is generated on the second optocoupler U2, and the first micro control unit MCU1 enters the power saving mode.

[0032] Power supply circuit wake-up state: the first micro control unit MCU1 detects the work signal, through the TXD1 foot of the first micro control unit MCU1 to send signal to the second micro control unit MCU2, the second micro control unit MCU2 in detecting the RXD2 foot level has changed, immediately enter the working state.

[0033] Specific further, the working state, the TXD1 foot of the first micro control unit MCU1 output pulse signal, the TXD2 foot of the second micro control unit MCU2 output pulse signal, the first optoelectronic coupler U1 and the second optoelectronic coupler U2 are in working state.

[0034] Specific further, the shutdown state, the first resistor R1 and the first optoelectronic coupler U1 are in non-consumption energy state.

[0035] Specific further, the RXD2 foot of the second micro control unit MCU2 is in no pulse signal for a period of time, avoid the second micro control unit MCU2 frequently wake up.

[0036] Specific further, the first optoelectronic coupler U1 and the second optoelectronic coupler U2 are in working state; or, the first optoelectronic coupler U1 and the second optoelectronic coupler U2 are in power saving state.

[0037] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power supply circuit, characterized by: The first micro control unit MCU1, the second micro control unit MCU2, the first optocoupler U1 and the second optocoupler U2 are included, the VDD1 pin and the TXD1 pin of the first micro control unit MCU1 are connected to the 1 pin and the 2 pin of the first optocoupler U1 respectively, the VCC pin and the RXD2 pin of the second micro control unit MCU2 are connected to the 4 pin of the first optocoupler U1, the HGND1 pin of the second micro control unit MCU2 is connected to the 3 pin of the first optocoupler U1; The VDD2 pin and the RXD1 pin of the first micro control unit MCU1 are connected to the 1 pin of the second optocoupler U2, the GND pin of the first micro control unit MCU1 is connected to the 2 pin of the second optocoupler U2, the TXD2 pin of the second micro control unit MCU2 is connected to the 4 pin of the second optocoupler U2, and the HGND2 pin of the second micro control unit MCU2 is connected to the 3 pin of the second optocoupler U2; The power supply circuit is configured to perform the following low-power standby control method: Power supply circuit working state: the first micro control unit MCU1 sends relevant control information to the second micro control unit MCU2 through the TXD1 pin, and the second micro control unit MCU2 returns information to the first micro control unit MCU1 through the TXD2 pin according to the current control state, so that the first micro control unit MCU1 and the second micro control unit MCU2 are in a working state; Power supply circuit shutdown state: the TXD1 pin of the first micro control unit MCU1 stops sending signals, so that no voltage drop is generated on the first optocoupler U1, the RXD2 pin of the second micro control unit MCU2 has no pulse signal for a period of time, the second micro control unit MCU2 enters a power saving mode, the TXD2 pin of the second micro control unit MCU2 outputs a low level, so that no voltage drop is generated on the second optocoupler U2, and the first micro control unit MCU1 enters a power saving mode; Power supply circuit wake-up state: when the first micro control unit MCU1 detects a working signal, the first micro control unit MCU1 sends a signal to the second micro control unit MCU2 through the TXD1 pin, and the second micro control unit MCU2 enters a working state immediately when detecting a change in the level of the RXD2 pin.

2. The power supply circuit of claim 1, wherein: A first resistor R1 is connected between the TXD1 pin of the first micro control unit MCU1 and the 2 pin of the first optocoupler U1.

3. The power supply circuit of claim 1, wherein: A second resistor R2 is connected between the VDD2 pin of the first micro control unit MCU1 and the 1 pin of the second optocoupler U2.

4. The power supply circuit of claim 1, wherein: A third resistor R3 is connected between the VCC pin of the second micro control unit MCU2 and the 4 pin of the first optocoupler U1.

5. The power supply circuit of claim 1, wherein: A fourth resistor R4 is connected between the TXD2 pin of the second micro control unit MCU2 and the 4 pin of the second optocoupler U2.

6. The power supply circuit of claim 1, wherein: In the working state, the TXD1 pin of the first micro control unit MCU1 outputs a pulse signal, and the TXD2 pin of the second micro control unit MCU2 outputs a pulse signal.

7. The power supply circuit of claim 2, wherein: In the shutdown state, the first resistor R1 and the first optocoupler U1 are in a non-energy consumption state.

8. The power supply circuit of claim 1, wherein: The RXD2 pin of the second micro control unit MCU2 is in a continuous pulseless signal for a period of time, avoiding the second micro control unit MCU2 from frequently waking up.

9. The power supply circuit of claim 1, wherein: The first optoelectronic coupler U1 and the second optoelectronic coupler U2 are in a working state; or, the first optoelectronic coupler U1 and the second optoelectronic coupler U2 are in a power saving state.

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