CN218335729U

CN218335729U - Power supply circuit with low power consumption standby

Info

Publication number: CN218335729U
Application number: CN202222328465.2U
Authority: CN
Inventors: 黎振豪
Original assignee: Guangdong Atlan Electronic Appliance Manufacture Co Ltd
Current assignee: Guangdong Atlan Electronic Appliance Manufacture Co Ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-01-17
Anticipated expiration: 2032-09-02

Abstract

The utility model particularly relates to a power supply circuit of low-power consumption standby, including step-down chip U2, including first micro control unit MCU and the micro control unit MCU2 of second, first micro control unit MCU 1 still is connected with optical coupler U1, and optical coupler U1 is connected in the RXD2 foot of the micro control unit MCU2 of second, and optical coupler U1 is connected with second triode Q2, and second triode Q2 is connected with first triode Q1, and first triode Q1 is connected in step-down chip U2's Vin foot department. The utility model has the advantages that the TXD1 of the first micro control unit MCU 1 stops sending signals, and is set at high level, so that no voltage drop is generated on the optical coupler U1, and the first resistor R1 does not consume energy; the second triode Q2 has no output, the first triode Q1 is not conducted, the VDD1 end has no voltage output, the V5H end has no output, and the second micro control unit MCU2 can not work, thereby achieving the purpose of power saving.

Description

Power supply circuit of low-power consumption standby

Technical Field

The utility model relates to a switching device circuit technical field, more specifically say, relate to a power supply circuit of low-power consumption standby.

Background

At present, basically, a relay control scheme is used for controlling strong current by a controller, and the scheme is simple and practical, but has the problems of large occupied space, long service life, cost and the like.

With the development of technology, in the situation of low current, the use of photoelectric coupler and related circuit gradually replaces the relay technology, for example, the national intellectual property office discloses a patent application number: CN201922001397.7, name of utility model: a circuit structure for realizing ultra-low standby power consumption by utilizing an optocoupler of a switching device comprises the following technical scheme: the ultralow stand-by power consumption circuit structure includes host computer, opto-coupler U13, PMOS pipe Q8 and main control board low voltage power supply, the control signal output of host computer and opto-coupler U13's the anodal electric connection of input, PMOS pipe Q8's one end is connected to opto-coupler U13's output, main control board low voltage power supply is connected to PMOS pipe Q8's the other end. The circuit improves the reliability of products to a certain extent and has small PCB use space, but is realized by using some peripheral devices, thereby wasting resources.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a power circuit that utilizes the existing signal to realize standby power consumption and simultaneously improve the low power consumption standby of reliability.

According to the utility model discloses a power supply circuit of low-power consumption standby, including step-down chip U2, including first little the control unit MCU 1 and the little the control unit MCU2 of second, first little the control unit MCU 1 still is connected with optical coupler U1, 4 feet of optical coupler U1 are connected in the little the control unit MCU 2's of second RXD2 foot, 4 feet of optical coupler U1 are connected with second triode Q2, second triode Q2's collecting electrode is connected with first triode Q1, first triode Q1's current collection is connected in step-down chip U2's Vin foot department.

Specifically, a Vin pin of the voltage reduction chip U2 is connected to a VDD1 terminal, and a Vout pin of the voltage reduction chip U2 is connected to a V5H pin.

Specifically, a first resistor R1 is connected in series between the TXD1 pin of the first micro control unit MCU 1 and the 2 pin of the optocoupler U1.

Specifically, a first diode D1 and a first capacitor C1 are sequentially connected between the pin 4 of the optical coupler U1 and the second triode Q2.

Specifically, a third resistor R3 and a second capacitor C2 are respectively connected between the base and the emitter of the second triode Q2.

Specifically, a fourth resistor R4 is connected to a common terminal between the base of the second triode Q2 and the second capacitor C2.

Specifically, a second resistor R2 is connected to a common terminal between the 4-pin of the optocoupler U1 and the first diode D1.

Specifically, a sixth resistor R6 is connected between the collector of the second triode Q2 and the base of the first triode Q1, and a fifth resistor R5 is connected to a common terminal between the sixth resistor R6 and the collector of the second triode Q2.

Specifically, the buck chip U2 is connected to pin 3 of the optocoupler U1, and a common terminal between the buck chip U2 and pin 3 of the optocoupler U1 is connected to the ground terminal GND.

The utility model has the advantages that: the circuit stops sending signals through the TXD1 of the first micro control unit MCU 1, and is set to be at a high level, so that no voltage drop is generated on the optical coupler U1, and the first resistor R1 does not consume energy; the second triode Q2 has no output, the first triode Q1 is not conducted, the VDD1 end has no voltage output, the V5H end has no output, and the second micro control unit MCU2 can not work, so that the purpose of power saving is achieved, standby power consumption is achieved by utilizing existing signals, and meanwhile reliability is improved.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a circuit diagram of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

The utility model discloses a power supply circuit of low-power consumption standby according to the embodiment of the utility model is described below with reference to fig. 1, including step-down chip U2, including first little the control unit MCU 1 and the little the control unit MCU2 of second, first little the control unit MCU 1 still is connected with optical coupler U1, 4 feet of optical coupler U1 are connected in the little the control unit MCU 2's of second RXD2 foot, 4 feet of optical coupler U1 are connected with second triode Q2, second triode Q2's collecting electrode is connected with first triode Q1, first triode Q1's collection current is connected in step-down chip U2's Vin foot department.

Specifically, a Vin pin of the voltage reduction chip U2 is connected to a VDD1 terminal, and a Vout pin of the voltage reduction chip U2 is connected to a V5H pin. The voltage reduction chip U2 performs the function of reducing voltage.

Specifically, a first resistor R1 is connected in series between a TXD1 pin of the first micro control unit MCU 1 and a 2 pin of the optocoupler U1. The first resistor R1 is used to protect the optocoupler U1 and the first micro control unit MCU 1.

Specifically, a first diode D1 and a first capacitor C1 are sequentially connected between the pin 4 of the optical coupler U1 and the second triode Q2. The first capacitor C1 plays a role in filtering and voltage limiting, and is used for protecting the second triode Q2.

Specifically, a third resistor R3 and a second capacitor C2 are respectively connected between the base and the emitter of the second triode Q2. The third resistor R3 and the second capacitor C2 are combined to act as a capacitive reactance to limit the maximum operating current, further protecting the second triode Q2.

Specifically, a fourth resistor R4 is connected to a common terminal between the base of the second triode Q2 and the second capacitor C2. The fourth resistor R4 is also used for current limiting.

Specifically, a second resistor R2 is connected to a common terminal between the 4-pin of the optocoupler U1 and the first diode D1. A sixth resistor R6 is connected between the collector of the second triode Q2 and the base of the first triode Q1, and a fifth resistor R5 is connected at the common end between the sixth resistor R6 and the collector of the second triode Q2. The sixth resistor R6 and the sixth resistor R6 are combined to protect the first transistor Q1.

Specifically, the buck chip U2 is connected to the pin 3 of the optocoupler U1, and a common terminal between the buck chip U2 and the pin 3 of the optocoupler U1 is connected to the ground terminal GND.

The working principle of the circuit is as follows:

1. under the working state, the TXD1 pin of the first micro control unit MCU 1 sends the related control information of the second micro control unit MCU2 through a communication protocol. Under normal operating condition, the RXD2 pin of the second micro control unit MCU2 outputs pulse signals, after being isolated by the first diode D1 and coupled with the first capacitor C1, the second capacitor C2 drives the second triode Q2 after smoothing filtering, and then the sixth resistor R6 drives the first triode Q1 to be conducted, so that the VDD end outputs a VDD1 end through the first triode Q1, and then the V5H end is output by the voltage reduction chip U2 to supply power for the second micro control unit MCU 2.

2. In a shutdown state, the TXD1 of the first micro control unit MCU 1 stops sending signals and is set to a high level at the same time, so that no voltage drop is generated on the optocoupler U1, and the first resistor R1 does not consume energy; the second triode Q2 has no output, the first triode Q1 is not conducted, the VDD1 end has no voltage output, the V5H end has no output, and the second micro control unit MCU2 can not work, so that the purpose of power saving is achieved, standby power consumption is realized by using the existing signals, and meanwhile, the reliability is improved.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. Power supply circuit of low-power consumption standby, including step-down chip U2, its characterized in that: including first little the control unit MCU 1 and the little the control unit MCU2 of second, first little the control unit MCU 1 still is connected with optical coupler U1, 4 feet of optical coupler U1 are connected in the little the control unit MCU 2's of second RXD2 foot, 4 feet of optical coupler U1 are connected with second triode Q2, second triode Q2's collecting electrode is connected with first triode Q1, first triode Q1's current collection is connected in step-down chip U2's Vin foot department.

2. The power supply circuit for low power consumption standby according to claim 1, wherein: the Vin pin of the voltage reduction chip U2 is connected with a VDD1 end, and the Vout pin of the voltage reduction chip U2 is connected with a V5H pin.

3. The power supply circuit for low power consumption standby according to claim 1, wherein: and a first resistor R1 is connected in series between the TXD1 pin of the first micro control unit MCU 1 and the 2 pin of the optocoupler U1.

4. The power supply circuit for low power consumption standby according to claim 1, wherein: and a first diode D1 and a first capacitor C1 are sequentially connected between the pin 4 of the optical coupler U1 and the second triode Q2.

5. The power supply circuit for low power consumption standby according to claim 1, wherein: and a third resistor R3 and a second capacitor C2 are respectively connected between the base electrode and the emitting electrode of the second triode Q2.

6. The power supply circuit for low power consumption standby according to claim 5, wherein: and a common end between the base electrode of the second triode Q2 and the second capacitor C2 is connected with a fourth resistor R4.

7. The power supply circuit for low power consumption standby according to claim 4, wherein: and a second resistor R2 is connected to a common end between the 4 pin of the optical coupler U1 and the first diode D1.

8. The power supply circuit for low power consumption standby according to claim 1, wherein: a sixth resistor R6 is connected between the collector of the second triode Q2 and the base of the first triode Q1, and a fifth resistor R5 is connected at the common end between the sixth resistor R6 and the collector of the second triode Q2.

9. The power supply circuit for low power consumption standby according to claim 1, wherein: the buck chip U2 is connected with the pin 3 of the optical coupler U1, and the common end between the buck chip U2 and the pin 3 of the optical coupler U1 is connected with the ground terminal GND.