CN210609102U

CN210609102U - Startup and shutdown circuit

Info

Publication number: CN210609102U
Application number: CN201921674309.3U
Authority: CN
Inventors: 陈默; 严宇
Original assignee: Jiangsu Sigas Measurement And Control Equipment Co ltd
Current assignee: Jiangsu Sigas Measurement And Control Equipment Co ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2020-05-22
Anticipated expiration: 2029-10-09

Abstract

The utility model relates to a control circuit technical field especially relates to a switching on and shutting down circuit. The key comprises a primary switch control module, a secondary switch control module, an isolation protection module, a key module and a delay control module, wherein the primary switch control module, the delay control module and the secondary switch control module are all connected through the isolation protection module; the button module sets up the second grade switch control module with delay between the control module, delay the control module and be connected with MCU's Power _ hold, the second grade switch control module is connected with MCU's Power _ sign. The power on/off control circuit has the advantages of low power consumption, low cost, simple structure and strong practicability.

Description

Startup and shutdown circuit

Technical Field

The utility model relates to a control circuit technical field especially relates to a switching on and shutting down circuit.

Background

When designing a one-button power switch for portable devices and general household appliances, a conventional key dial or D-trigger switching method is generally used.

The traditional key dial switch has poor stability and is easy to generate the condition of error touch, and the traditional key dial switch needs to be applied to a power management chip, so that the application of the power management chip not only has long response time, but also increases the power consumption and the cost of the whole circuit; the conventional D flip-flop has low cost but low stability, and particularly when the D flip-flop enters a metastable state, the D flip-flop cannot correctly respond to a switch instruction, which may cause great damage to the function of the entire circuit.

To this end, we propose a power on/off circuit to solve the above problem.

Disclosure of Invention

The utility model aims at solving the shortcomings of large power consumption, high cost and complex structure in the prior art and providing a startup and shutdown circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a startup and shutdown circuit is characterized by comprising a primary switch control module, a secondary switch control module, an isolation protection module, a key module and a delay control module, wherein the primary switch control module, the delay control module and the secondary switch control module are connected through the isolation protection module; the button module sets up the second grade switch control module with delay between the control module, delay the control module and be connected with MCU's Power _ hold, the second grade switch control module is connected with MCU's Power _ sign.

Further, the primary switch control module comprises Q₃And R₄Wherein, said Q₃Comprises a PMOS tube, Q₃The drain electrode of the transistor is externally connected with other circuits, the grid electrode of the transistor is connected with a voltage switch, and the grid electrode of the transistor passes through R₄And the source electrode is connected with the isolation protection module.

Further, the secondary switch control module comprises Q₁And R₁，Q₁Including S8850, the Q₁The base electrode of the collector is connected with the isolation protection module, the emitter is connected with a pull-up voltage of 5V, and the collectorUnder the electrode by R₁GND, wherein the Power _ sign of MCU is set at S8850 and R₁In the meantime.

Further, the delay control module includes Q₂、R₅And R₆Said Q is₂Comprises DMN3042L, the Q₂Is passed through R₅Connected to GND, said Q₂Is passed through R₆Power _ hold connection with MCU, Q₂Is connected to GND, Q₂Is connected with the isolation protection module.

Further, the isolation protection module comprises D₁、R₃And R₂Said D is₁Comprises MBR0520, D₁Respectively, by R₃And R₂With a pull-up voltage and said Q₁Connection of said D₁Positive electrode of (2) and said Q₂And (4) connecting.

The utility model provides an isolation protection module of on & off circuit setting is in Q₂When the circuit is saturated, the circuit can be isolated from a 5V pull-up voltage, so that the normal operation of the circuit is guaranteed, and the button state of the Power _ sign can be ensured not to be influenced; the power supply turning-off mode of the switching machine control circuit can ensure that the power consumption of the whole switching machine circuit is zero in the process of turning off the power supply, and low power consumption is realized; in addition, the startup and shutdown control circuit is low in cost, simple in structure and strong in practicability.

Drawings

Fig. 1 shows a block diagram of a switching circuit according to an embodiment of the present invention;

fig. 2 shows a circuit connection diagram of the switching circuit of the present invention;

fig. 3 shows a working flow of the startup and shutdown circuit of the present invention;

fig. 4 shows the working flow of the power on/off circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

A startup and shutdown circuit refers to FIG. 1, and comprises a primary switch control module, a secondary switch control module, an isolation protection module, a key module and a delay control module, wherein the primary switch control module, the delay control module and the secondary switch control module are all connected through the isolation protection module; the button module sets up the second grade switch control module with delay between the control module, delay the control module and be connected with MCU's Power _ hold, the second grade switch control module is connected with MCU's Power _ sign.

Referring to fig. 2, the primary switch control module includes Q₃And R₄The secondary switch control module comprises Q₁And R₁Wherein the secondary switch control module comprises Q₁And R₁Said delay control module comprises Q₂、R₅And R₆Said isolation protection module comprises D₁、R₃And R₂；

In a preferred embodiment, Q₁Is S8850, Q₂Is DMN3042L, Q₃Is a PMOS tube, D₁Is MBR0520, R₁、R₂、R₂And R₄Is a 10K resistance, R₅Is a resistance of 100K, R₅Resistance of 20K;

specifically, the PMOS tube is an 8pinPMOS tube, 5 pins, 6 pins, 7 pins and 8 pins of the 8pinPMOS tube are externally connected with other circuits, 1 pin, 2 pins and 3 pins of the PMOS tube are connected with a voltage switch, and the 1 pin, 2 pins and 3 pins of the PMOS tube are connected with a R circuit through the R circuit₄Is connected with the 3 pin of the DMN3042L, the 1 pin, the 2 pin and the 3 pin of the PMOS tube are connected with the anode of the MBR0520, and R is arranged between the 1 pin, the 2 pin and the 3 pin of the PMOS tube and the anode of the MBR0520₄And the 4 pin is connected with the 3 pin of DMN 3042L; the 1 pin of the DMN3042L is connected with the Power _ hold pin of the MCU system, and R is connected between the 1 pin of the DMN3042L and the Power _ hold pin of the MCU system₆The lower part of 1 foot of DMN3042L is passed through R₅Grounding, grounding pin 2 of DMN3042L, cathode of MBR0520, key module, and R₂And R₃Connected, MBR0520Negative electrode passing through R₂Is connected with pin 1 of S8850, pin 2 of S8850 is connected with pull-up resistor of 5V, and pin 3 of S8850 is connected with pull-up resistor of 5V through R₁Grounded, the Power _ sign of MCU is set in the S8850 and R₁In the meantime.

Referring to fig. 3, when the system is powered on, the Power _ hold terminal receives a high level, S8850 is saturated at this time, the Power _ sign terminal outputs a high voltage, and a signal that the key module is pressed is sent at this time; the DMN3042L is saturated, at this time, even if the system is in a stable state, the whole circuit system still maintains a power supply state even if the key module is released; loosening the key module, stopping S8850, outputting a low level by the Power _ sign end, and sending a signal for loosening the key module;

referring to fig. 4, S8850 is turned off, DMN3042L is in operation and discharged, the system Power supply is cut off after 5 seconds, Power _ hold is inverted to low level, S8850 and DMN3042L are cut off, and the system Power off succeeds.

The above description is only a part of the detailed embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can combine, substitute or change the technical solution of the present invention and the inventive concept thereof within the technical scope of the present invention.

Claims

1. A startup and shutdown circuit is characterized by comprising a primary switch control module, a secondary switch control module, an isolation protection module, a key module and a delay control module, wherein the primary switch control module, the delay control module and the secondary switch control module are connected through the isolation protection module; the button module sets up the second grade switch control module with delay between the control module, delay the control module and be connected with MCU's Power _ hold, the second grade switch control module is connected with MCU's Power _ sign.

2. The switch-on/switch-off circuit as claimed in claim 1, wherein the primary switch control module comprises Q₃And R₄Wherein, said Q₃Comprises a PMOS tube, Q₃The drain electrode of the grid-connected voltage switch is externally connected with a circuit, the grid electrode of the grid-connected voltage switch passes through the resistor R₄And the source electrode is connected with the isolation protection module.

3. The switch-on/off circuit as claimed in claim 1, wherein the secondary switch control module comprises Q₁And R₁，Q₁Including S8850, the Q₁The base electrode of the isolation protection module is connected with the isolation protection module, the emitter is connected with a pull-up voltage of 5V, and the lower part of the collector electrode passes through R₁GND, wherein the Power _ sign of MCU is set at S8850 and R₁In the meantime.

4. The switch-on/off circuit as claimed in claim 3, wherein the delay control module comprises Q₂、R₅And R₆Said Q is₂Comprises DMN3042L, the Q₂Is passed through R₅Connected to GND, said Q₂Is passed through R₆Power _ hold connection with MCU, Q₂Is connected to GND, Q₂Is connected with the isolation protection module.

5. The switch-on/switch-off circuit as claimed in claim 4, wherein the isolation protection module comprises D₁、R₃And R₂Said D is₁Comprises MBR0520, D₁Respectively, by R₃And R₂And a 5V pull-up voltage and said Q₁Connection of said D₁Positive electrode of (2) and said Q₂And (4) connecting.