CN219268834U

CN219268834U - Automatic shutdown control circuit

Info

Publication number: CN219268834U
Application number: CN202320026651.2U
Authority: CN
Inventors: 刘强; 刘木伙; 王森在; 胡毓铭
Original assignee: Shenzhen Weizi Medical Co ltd
Current assignee: Shenzhen Weizi Medical Co ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-06-27
Anticipated expiration: 2033-01-06

Abstract

The utility model provides an automatic shutdown control circuit which comprises a first transistor, a first driving resistor, a second driving resistor, a first diode, a touch switch, a second diode, a second transistor, a third driving resistor and a fourth driving resistor. According to the automatic shutdown control circuit, once the circuit system is started, the automatic shutdown function can be realized according to service requirements, the automatic shutdown action can be realized only by changing the signal of the power supply end to a low level, and once the circuit system is started, the battery loop is completely cut off, so that the problem of micro current consumption of certain circuit systems with standby or sleep modes is avoided.

Description

Automatic shutdown control circuit

Technical Field

The utility model relates to the technical field of automatic switching, in particular to an automatic shutdown control circuit.

Background

At present, a common circuit system switch circuit in the market or a manually controlled mechanical switch cannot realize automatic shutdown of the system; or the key switch (touch switch) is touched but the power supply cannot be completely cut off in the power-off state. Resulting in a constant battery drain.

Disclosure of Invention

The utility model aims to provide an automatic shutdown control circuit to solve the problem that the power supply cannot be completely cut off in the shutdown state of the traditional circuit system switching mode.

The utility model provides an automatic shutdown control circuit which comprises a first transistor, a first driving resistor, a second driving resistor, a first diode, a touch switch, a second diode, a second transistor, a third driving resistor and a fourth driving resistor, wherein the first driving resistor is connected with the first diode;

the source electrode of the first transistor is connected with the power input end and the first end of the first driving resistor at the same time, the drain electrode of the first transistor is connected with the circuit system, and the grid electrode of the first transistor is connected with the second end of the first driving resistor and the first end of the second driving resistor at the same time;

the second end of the second driving resistor is connected with the drain electrode of the second crystal end and the positive electrode of the first diode at the same time;

the negative electrode of the first diode is connected with the first end of the touch switch and the negative electrode of the second diode at the same time, and the second end of the touch switch is grounded;

the anode of the second diode is connected with the starting end of the circuit system;

the source electrode of the second transistor is connected with the ground and the first end of the fourth driving resistor at the same time, and the grid electrode of the second transistor is connected with the second end of the fourth driving resistor and the first end of the third driving resistor at the same time;

and the second end of the third driving resistor is connected with the power supply end of the circuit system.

According to the automatic shutdown control circuit, the power supply is input from the power supply input end, when the circuit system is in a shutdown state, after the light touch switch is pressed, on one hand, current flows through the first driving resistor, the second driving resistor, the first diode and the touch switch to form a loop, the first driving resistor and the second driving resistor are properly selected, so that enough voltage is generated at two ends of the first driving resistor, namely enough negative voltage is generated at the grid electrode-source electrode of the first transistor, the first transistor is conducted, and the power supply is sent to a subsequent circuit through the first transistor, so that the circuit system is electrified and starts working; after the circuit system is electrified, as the touch switch is still in a pressed state, the second diode is continuously conducted, the signal of the opening end of the circuit system is still in a low level, and the circuit system considers the starting request, so that the signal of the power end becomes a high level, the second transistor is driven to be conducted through the third driving resistor and the fourth driving resistor, and the first transistor is maintained to be continuously conducted; at this time, the touch switch can be loosened; the circuit system completes the starting action; the circuit system is in the normal work of starting up, the touch switch is pressed down, the second diode is conducted, the signal of the starting end of the circuit system is pulled down and becomes low level, the circuit system detects that the signal is low, and the circuit system is in the current starting up working state, so that the circuit system judges that the circuit system is in a shutdown request, and the signal of the power supply end becomes low level; at this time, the touch switch is released, the first driving resistor and the second driving resistor have no current flowing, the first transistor is cut off and turned off, the rear circuit system is powered off, and the circuit system completes the shutdown action.

Further, the first transistor and the second transistor may be any one of a bipolar transistor and a field effect transistor.

Drawings

Fig. 1 is a circuit diagram of an auto-off control circuit in a first embodiment of the present utility model.

Description of main reference numerals:

first transistor	10	Touch control switch	50	Fourth driving resistor	90
						First driving resistor	20	Second diode	60	Circuit system	100
Second driving resistor	30	Second transistor	70
						First diode	40	Third driving resistor	80

The utility model will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The utility model provides an automatic shutdown control circuit, which comprises a first transistor 10, a first driving resistor 20, a second driving resistor 30, a first diode 40, a touch switch 50, a second diode 60, a second transistor 70, a third driving resistor 80 and a fourth driving resistor 90, wherein;

the source of the first transistor 10 is connected to the power input terminal VIN and the first terminal of the first driving resistor 20, the drain of the first transistor 10 is connected to the circuitry 100, and the gate of the first transistor 10 is connected to the second terminal of the first driving resistor 20 and the first terminal of the second driving resistor 30;

the second end of the second driving resistor 30 is connected with the drain electrode of the second crystal end and the anode of the first diode 40 at the same time;

the negative electrode of the first diode 40 is connected with the first end of the touch switch 50 and the negative electrode of the second diode 60 at the same time, and the second end of the touch switch 50 is grounded;

the anode of the second diode 60 is connected with the start-up terminal of the circuit system 100;

the source of the second transistor 70 is connected to the ground and the first end of the fourth driving resistor 90 at the same time, and the gate of the second transistor 70 is connected to the second end of the fourth driving resistor 90 and the first end of the third driving resistor 80 at the same time;

a second terminal of the third driving resistor 80 is connected to a power terminal of the circuitry 100.

In the above automatic shutdown control circuit, the power is input from the power input terminal VIN, when the circuit system 100 is in the shutdown state, after the light touch switch 50 is pressed, on one hand, the current flows through the resistor first driving resistor 20, the second driving resistor 30, the first diode 40 and the touch switch 50 to form a loop, the first driving resistor 20 and the second driving resistor 30 select appropriate resistance values, so that sufficient voltages are generated at two ends of the first driving resistor 20, that is, the gate-source electrode of the first transistor 10 will generate sufficient negative voltage, so that the first transistor 10 is turned on, and the power is sent to the following circuit through the first transistor 10, thereby realizing the power-up of the circuit system 100 and starting the operation; after the circuit system 100 is powered on, since the touch switch 50 is still in the pressed state, the second diode 60 is continuously turned on, the signal at the open end of the circuit system 100 is still at the low level, the circuit system 100 considers the power-on request, and therefore, the signal at the power supply end becomes the high level, and the second transistor 70 is driven to be turned on through the third driving resistor 80 and the fourth driving resistor 90, so that the first transistor 10 is maintained to be continuously turned on; at this time, the touch switch 50 can be released; the circuitry 100 completes the power-on action; when the circuit system 100 is in normal operation during startup, the touch switch 50 is pressed, the second diode 60 is turned on, the signal at the starting end of the circuit system 100 is pulled down and becomes low level, the circuit system 100 detects that the signal becomes low, and is in the startup working state at present, so that the power-off request is judged, and the signal at the power supply end becomes low level; at this time, the touch switch 50, the first driving resistor 20, the second driving resistor 30 are released, no current flows through, the first transistor 10 is turned off, the following circuit system 100 is powered down, the circuit system 100 completes the shutdown action, it can be seen that once the circuit system 100 can realize the automatic shutdown function according to the service requirement after being powered on, the automatic shutdown action can be realized only by changing the signal meeting the power supply terminal to a low level, and once the circuit is powered off, the battery loop is completely cut off, so that the problem of micro current consumption of some circuit systems 100 with standby or sleep modes is avoided.

Specifically, in the present utility model, the first transistor 10 and the second transistor 70 may be either bipolar transistors or field effect transistors.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The automatic shutdown control circuit is characterized by comprising a first transistor, a first driving resistor, a second driving resistor, a first diode, a touch switch, a second diode, a second transistor, a third driving resistor and a fourth driving resistor, wherein the first driving resistor is connected with the first diode;

2. The automatic shutdown control circuit of claim 1, wherein the first transistor and the second transistor are each either bipolar transistors or field effect transistors.