CN217133576U - Startup and shutdown circuit and equipment - Google Patents
Startup and shutdown circuit and equipment Download PDFInfo
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- CN217133576U CN217133576U CN202221236817.5U CN202221236817U CN217133576U CN 217133576 U CN217133576 U CN 217133576U CN 202221236817 U CN202221236817 U CN 202221236817U CN 217133576 U CN217133576 U CN 217133576U
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Abstract
The application discloses switching on and shutting down circuit and equipment relates to low-power consumption control circuit field. The circuit includes: the device comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor. The LTC2950-2 chip is replaced by two MOS tubes, a first resistor and a second resistor, and the cost of the MOS tubes and the resistors is far lower than that of the LTC2950-2 chip, so that the purpose of reducing the cost is achieved; meanwhile, after the electronic equipment is shut down, the shutdown current is far smaller than that of the electronic equipment using the LTC2950-2 chip, so that the situation that the electronic equipment cannot be started due to the fact that the electric quantity of the battery is exhausted is avoided.
Description
Technical Field
The application relates to the field of low-power-consumption control circuits, in particular to a startup and shutdown circuit and equipment.
Background
With the popularization of portable electronic devices, in order to meet the requirements of portability, most of the electronic devices are powered by dry batteries or lithium batteries. Wherein a large portion of the electronic devices are still in a charged state after being shut down. At this moment, even if the electronic equipment is in a shutdown state, the electric quantity of the dry battery or the lithium battery is gradually consumed, and further, when the electronic equipment is used next time, the electronic equipment cannot be started due to the fact that the electric quantity of the battery is exhausted.
In recent years, the above-mentioned technical problems have been solved by using a chip of LTC2950-2 type. However, there arises a new problem that a plurality of chips of this type need to be used in one electronic apparatus, and when a plurality of chips of this type are used, the cost of the entire electronic apparatus increases; meanwhile, most importantly, even if the chip of the type is used, shutdown current exists in the electronic equipment after the electronic equipment is shut down, the electric quantity of a dry battery or a lithium battery in the electronic equipment is consumed, and meanwhile, the electronic equipment cannot be started due to the fact that the electric quantity of the battery is exhausted.
In view of the foregoing prior art, how to avoid battery exhaustion in electronic devices is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a switching-on and switching-off circuit which is used for reducing cost, and meanwhile after electronic equipment is switched off, the switching-off current in the circuit is far smaller than the switching-off current when an LTC2950-2 chip is used, so that the situation that the electronic equipment cannot be switched on due to the fact that the electric quantity of a battery is exhausted is avoided.
In order to solve the above technical problem, the present application provides a power on/off circuit, including: the device comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor;
the common end that constitutes by the first end of button and the second end of second resistance is as the input of switching on and shutting down circuit, the second end ground connection of button, the first end of second resistance is connected with the common end that constitutes by the grid of first MOS pipe and the second end of first resistance, the drain electrode of first MOS pipe is connected with the load, the source electrode and the first end of first resistance of first MOS pipe are connected, the first end and the battery of first resistance are connected, the drain electrode and the second end of first resistance of second MOS pipe are connected, the source electrode ground connection of second MOS pipe, the grid of second MOS pipe is as the output of switching on and shutting down circuit.
Preferably, the method further comprises the following steps: a first diode and a second diode;
and a common end formed by the anode of the first diode and the cathode of the second diode is used as an input end of the switching-on/switching-off circuit, the cathode of the first diode is connected with the second end of the second resistor, and the anode of the second diode is grounded.
Preferably, the method further comprises the following steps: a third resistor;
the first end of the third resistor is connected with the MCU power supply end; the second end of the third resistor is connected to a common terminal formed by the anode of the first diode and the cathode of the second diode.
Preferably, the method further comprises the following steps: a first capacitor;
the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is grounded.
Preferably, the method further comprises the following steps: a second capacitor;
the first end of the second capacitor is connected with the source electrode of the first MOS tube, and the second end of the second capacitor is connected with the second end of the first resistor.
Preferably, the method further comprises the following steps: a fourth resistor and a third capacitor;
the first end of the fourth resistor is connected with the grid electrode of the second MOS tube, the second end of the fourth resistor is grounded, the first end of the third capacitor is connected with the first end of the fourth resistor, and the second end of the third capacitor is grounded.
Preferably, the method further comprises the following steps: a fifth resistor;
the first end of the fifth resistor is connected with the grid electrode of the second MOS tube, and the second end of the fifth resistor is used as the input end of the switching circuit.
Preferably, the method further comprises the following steps: a fourth capacitor;
the first end of the fourth capacitor is connected with the first end of the first resistor, and the second end of the fourth capacitor is grounded.
Preferably, the first diode and the second diode are both schottky diodes.
In order to solve the technical problem, the present application further provides a power on/off device applied to the above mentioned power on/off circuit.
The application provides a switching on and shutting down circuit includes: the device comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor. The common end that constitutes by the first end of button and the second end of second resistance is as the input of switching on and shutting down circuit, the second end ground connection of button, the first end of second resistance is connected with the common end that constitutes by the grid of first MOS pipe and the second end of first resistance, the drain electrode of first MOS pipe is connected with the load, the source electrode and the first end of first resistance of first MOS pipe are connected, the first end and the battery of first resistance are connected, the drain electrode and the second end of first resistance of second MOS pipe are connected, the source electrode ground connection of second MOS pipe, the grid of second MOS pipe is as the output of switching on and shutting down circuit. The LTC2950-2 chip is replaced by two MOS tubes, a first resistor and a second resistor, and the cost of the MOS tubes and the resistors is far lower than that of the LTC2950-2 chip, so that the purpose of reducing the cost is achieved; meanwhile, the circuit is connected in such a way, so that after the electronic equipment is shut down, the shutdown current in the circuit is far less than that when the LTC2950-2 chip is used, and the condition that the electronic equipment cannot be started due to the exhaustion of the electric quantity of the battery is avoided.
The application also provides a startup and shutdown device, and the effect is the same as above.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of a switching circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of another switching circuit provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a startup and shutdown circuit and equipment. In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
When the switching circuit is applied to a portable electronic device, the use of the LTC2950-2 chip increases the cost of the electronic device for a low-profit portable electronic device. Fig. 1 is a circuit diagram of a switching circuit according to an embodiment of the present application, in order to reduce the cost of a portable electronic device while maintaining the performance of the portable electronic device, the present application provides a switching circuit, as shown in fig. 1, including: the device comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor.
In the circuit, the connection modes of the first MOS transistor Q1, the second MOS transistor Q2, the key S, the first resistor R1 and the second resistor R2 are as follows: the common end that constitutes by the first end of button and the second end of second resistance is as the input of switching on and shutting down circuit, the second end ground connection of button, the first end of second resistance is connected with the common end that constitutes by the grid of first MOS pipe and the second end of first resistance, the drain electrode of first MOS pipe is connected with the load, the source electrode and the first end of first resistance of first MOS pipe are connected, the first end and the battery of first resistance are connected, the drain electrode and the second end of first resistance of second MOS pipe are connected, the source electrode ground connection of second MOS pipe, the grid of second MOS pipe is as the output of switching on and shutting down circuit.
In the circuit, the first MOS transistor is a PMOS transistor, and the second MOS transistor is an NMOS transistor. The key mentioned in this embodiment can be understood as a main switch for turning on or off the portable electronic device, and the main switch is a tact switch without a self-locking function. And when the switch is pressed down, the electronic equipment is in a working state, and when the switch is pressed down again, the electronic equipment is in a shutdown state. When the electronic equipment is in a shutdown state and the state of the electronic equipment is changed from the shutdown state to a working state, pressing the switch to electrify the load, and then releasing the switch, wherein the electronic equipment is changed from the shutdown state to the working state; when the electronic equipment is in the working state, the switch is pressed, and at the moment, the electronic equipment is changed into the shutdown state from the working state. Note that when the LTC2950-2 chip is used, even if the electronic device is turned off, a shutdown current is present therein, and the current value is generally 6 uA. It is conceivable that the current is a large current for the battery of the portable electronic device, which accelerates the power consumption of the battery, and causes the electronic device to be unable to start up normally when the electronic device is used next time. In this embodiment, the resistance, the type, the kind, and the maximum current value borne by the first resistor and the second resistor are not limited, and the implementation manner of the first resistor and the second resistor may be determined according to a specific implementation scenario. As a more preferred embodiment, the maximum operating current of the first MOS transistor may be determined according to the power consumption of the subsequent circuit, and the type of the first MOS transistor may be selected based on the maximum operating current.
In this embodiment, the power on/off circuit includes: the device comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor. The LTC2950-2 chip is replaced by two MOS tubes, a first resistor and a second resistor, and the cost of the MOS tubes and the resistors is far lower than that of the LTC2950-2 chip, so that the purpose of reducing the cost is achieved; meanwhile, after the electronic equipment is shut down, the shutdown current is far smaller than that of the electronic equipment using the LTC2950-2 chip, so that the situation that the electronic equipment cannot be started due to the fact that the electric quantity of the battery is exhausted is avoided.
On the basis of the above embodiment, as a more preferred implementation, the switching circuit further includes: a first diode D1, a second diode D2. It should be noted that the first diode and the second diode are schottky diodes. And a common end formed by the anode of the first diode and the cathode of the second diode is used as an input end of the switching-on/switching-off circuit, the cathode of the first diode is connected with the second end of the second resistor, and the anode of the second diode is grounded. At this moment, the first diode and the second diode can prevent the gate voltage of the first MOS transistor from being divided by the first resistor and the second resistor at the input end of the switching circuit and/or the output end of the switching circuit to cause the misconduction of the first MOS transistor and the second MOS transistor when the switching circuit is in the shutdown state. It should be noted that the types of the first diode and the second diode and the maximum value of the current passing through them are not limited, and the implementation manner thereof may be determined according to a specific implementation scenario. It is understood that the specific implementation scenarios mentioned in the present application shall relate to the changes of various functions of the portable electronic device and the specific scenarios when the current or voltage inside the portable electronic device is required, and in the actual production life, the specific implementation scenarios are much more than what is stated in the present application, but all the scenarios that can occur in the actual production life are also included in the present application.
In addition, the power on/off circuit further includes: and a third resistor R3. The first end of the third resistor is connected with the MCU power supply end; the second end of the third resistor is connected to a common terminal formed by the anode of the first diode and the cathode of the second diode. It should be noted that the type and kind of the third resistor and the maximum value of the current passing through the third resistor are not limited, and the implementation manner of the third resistor may be determined according to a specific implementation scenario.
Further comprising: a first capacitor C1. The first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is grounded. It should be noted that the type and kind of the first capacitor and the maximum value of the current passing through the first capacitor are not limited, and the implementation manner of the first capacitor can be determined according to specific implementation scenarios.
Further comprising: a second capacitor C2. The first end of the second capacitor is connected with the source electrode of the first MOS tube, and the second end of the second capacitor is connected with the second end of the first resistor. It should be noted that the type and kind of the second capacitor and the maximum value of the current passing through the second capacitor are not limited, and the implementation manner of the second capacitor can be determined according to specific implementation scenarios. The second capacitor can prevent the first MOS tube from being conducted by mistake.
Further comprising: a fourth resistor R4 and a third capacitor C3. The first end of the fourth resistor is connected with the grid electrode of the second MOS tube, the second end of the fourth resistor is grounded, the first end of the third capacitor is connected with the first end of the fourth resistor, and the second end of the third capacitor is grounded. It should be noted that the type and kind of the fourth resistor and the third capacitor, and the maximum value of the current passing through them are not limited, and the implementation thereof may be determined according to the specific implementation scenario. The fourth resistor and the third capacitor are combined to play a role in filtering, so that signals obtained at the output end of the on-off circuit are more accurate. And prevent the second MOS tube from being damaged and misconducted.
Further comprising: and a fifth resistor R5. The first end of the fifth resistor is connected with the grid electrode of the second MOS tube, and the second end of the fifth resistor is used as the input end of the switching circuit. It should be noted that the type and kind of the fifth resistor and the maximum value of the current passing through the fifth resistor are not limited, and the implementation manner of the fifth resistor may be determined according to a specific implementation scenario.
Further comprising: a fourth capacitor C4. The first end of the fourth capacitor is connected with the first end of the first resistor, and the second end of the fourth capacitor is grounded. It should be noted that the type and kind of the fourth capacitor and the maximum value of the current passing through the fourth capacitor are not limited, and the implementation manner of the fourth capacitor can be determined according to specific implementation scenarios. When the batteries in the switching circuit are reversely connected, the key does not change the connection and disconnection of the first MOS tube and the first MOS tube. Therefore, as a better embodiment, the fourth capacitor should be a non-polar capacitor to prevent the switch-on/off circuit from being damaged when the battery is reversely connected.
For the switching on/off circuit, when the switching on/off circuit is in a power-off state, the key is pressed, the grid voltage of the first MOS tube is divided by the battery voltage through the first resistor and the second resistor, and the grid voltage of the first MOS tube is marked as VBAT. At this time, the appropriate resistance values are selected for the first resistor and the second resistor, so that the voltage difference between the gate and the source of the first MOS transistor is [ -VBAT × R1/(R1+ R2) ]. And when the voltage difference between the grid electrode and the source electrode of the first MOS tube reaches the conduction voltage, controlling the first MOS tube to be conducted. For example: when the breakover voltage of the first MOS tube is-1V and VBAT is larger than 2V, the resistance value of the first resistor is larger than that of the second resistor, and the first MOS tube is conducted when a key is pressed. It should be noted that, when the first MOS transistor and the second MOS transistor are turned on, a corresponding parasitic diode is generated inside the first MOS transistor and the second MOS transistor.
The voltage of the load end is recorded as VBAT _1, the voltage of the load end is a difference value between the gate voltage of the first MOS transistor and the conduction voltage of the first MOS transistor, and when the first MOS transistor is conducted, the resistance value inside the first MOS transistor is small, so that the voltage of the load end is considered to be approximately equal to the gate voltage of the first MOS transistor. And recording the voltage of the MCU power supply end as VDD, wherein the voltage of the MCU power supply end is obtained by the voltage of the load end through a DC-DC conversion chip, and the DC-DC conversion chip is one of a plurality of loads connected with the load end. When the MCU normally supplies power for the MCU power supply end, the voltage of the input end of the switching circuit is the voltage when the first diode and the second diode are conducted, when the MCU detects the voltage, a high level signal is output at the output end of the switching circuit, the second MOS tube is conducted through the high level signal, the voltage of the grid electrode of the first MOS tube is pulled down, if the button is loosened at the moment, the first MOS tube is still in a conducting state, and therefore the switching circuit is changed into a starting state from the shutdown state.
When the power on/off circuit is in a power on state, the voltage of the input end of the power on/off circuit passes through the voltage value obtained after voltage division of the second resistor, the third resistor, the first diode and the second diode. When the key is pressed again, the MCU detects that the voltage of the input end of the switching circuit is pulled down, the output end of the switching circuit outputs a low level signal to control the second MOS tube to be switched off, and when the key is released, the grid electrode of the first MOS tube receives the high level signal at the moment, the first MOS tube is in a switched-off state, so that the switching-on state is changed into the switching-off state.
When the switching circuit is in a shutdown state, the output end of the switching circuit is in a high-resistance state, so that the second MOS tube is in a non-conduction state, the voltage difference between the grid electrode and the source electrode of the first MOS tube is not enough to enable the first MOS tube to be conducted, the MCU power supply end has no voltage, the problem that the switching circuit consumes the electric quantity of a battery does not exist at the moment, and the power consumption of the portable electronic equipment after shutdown is very low at the moment.
When the switching circuit adopts the above-mentioned device and is connected according to the described connection method, the off current in the switching circuit is about 0.2uA, which is much smaller than the off current of 6uA when using LTC2950-2 chip.
The above detailed description is made on the embodiment of the switching circuit, and the present application also provides a corresponding embodiment of the switching system, which is applied to the above mentioned switching circuit. In the on/off system, the number of on/off circuits is not limited, and a plurality of on/off circuits may be used, but the number of on/off circuits is preferably not more than 10 in consideration of portability and functionality of the portable electronic device. Of course, it is understood that when the number of the switching circuits is increased, the volume of the electronic device is increased, and a solution in which the portability is abandoned only by considering the functionality also falls within the scope of the present application.
In this embodiment, the power on/off system includes a plurality of power on/off circuits, and also includes a plurality of first MOS transistors, a plurality of second MOS transistors, a plurality of keys, a plurality of first resistors, and a plurality of second resistors. The LTC2950-2 chip is replaced by two MOS tubes in each switching circuit, a first resistor and a second resistor, and the cost of the MOS tubes and the resistors is far lower than that of the LTC2950-2 chip, so that the purpose of reducing the cost is achieved; meanwhile, after the electronic equipment is shut down, the shutdown current is far smaller than that of the electronic equipment using the LTC2950-2 chip, so that the situation that the electronic equipment cannot be started due to the fact that the electric quantity of the battery is exhausted is avoided. The same technical effect as the on-off circuit is achieved. It should be noted that other devices having the same effect as the devices mentioned in the present application are within the scope of the present application.
The above detailed description is provided for a power on/off circuit and device provided by the present application. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A power on/off circuit, comprising: the circuit comprises a first MOS tube, a second MOS tube, a key, a first resistor and a second resistor;
the switch circuit comprises a key, a first resistor, a second resistor, a common end, a drain electrode and a load, wherein the common end formed by the first end of the key and the second end of the second resistor is used as the input end of the switch circuit, the second end of the key is grounded, the first end of the second resistor is connected with the common end formed by the grid electrode of the first MOS tube and the second end of the first resistor, the drain electrode of the first MOS tube is connected with the load, the source electrode of the first MOS tube is connected with the first end of the first resistor, the first end of the first resistor is connected with a battery, the drain electrode of the second MOS tube is connected with the second end of the first resistor, the source electrode of the second MOS tube is grounded, and the grid electrode of the second MOS tube is used as the output end of the switch circuit.
2. The switching circuit according to claim 1, further comprising: a first diode and a second diode;
and a common end formed by the anode of the first diode and the cathode of the second diode is used as an input end of the switching circuit, the cathode of the first diode is connected with the second end of the second resistor, and the anode of the second diode is grounded.
3. The switching circuit of claim 2, further comprising: a third resistor;
the first end of the third resistor is connected with the MCU power supply end; a second terminal of the third resistor is connected to the common terminal formed by the anode of the first diode and the cathode of the second diode.
4. The switching circuit of claim 2, further comprising: a first capacitor;
the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is grounded.
5. The switching circuit according to claim 1, further comprising: a second capacitor;
the first end of the second capacitor is connected with the source electrode of the first MOS tube, and the second end of the second capacitor is connected with the second end of the first resistor.
6. The switching circuit according to claim 1, further comprising: a fourth resistor and a third capacitor;
the first end of the fourth resistor is connected with the grid electrode of the second MOS tube, the second end of the fourth resistor is grounded, the first end of the third capacitor is connected with the first end of the fourth resistor, and the second end of the third capacitor is grounded.
7. The switching circuit according to claim 1, further comprising: a fifth resistor;
and a first end of the fifth resistor is connected with the grid electrode of the second MOS tube, and a second end of the fifth resistor is used as an input end of the switching circuit.
8. The switching circuit of claim 1, further comprising: a fourth capacitor;
and the first end of the fourth capacitor is connected with the first end of the first resistor, and the second end of the fourth capacitor is grounded.
9. The switching circuit of claim 2, wherein the first diode and the second diode are both schottky diodes.
10. An on/off device, comprising: the switching circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221236817.5U CN217133576U (en) | 2022-05-20 | 2022-05-20 | Startup and shutdown circuit and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221236817.5U CN217133576U (en) | 2022-05-20 | 2022-05-20 | Startup and shutdown circuit and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217133576U true CN217133576U (en) | 2022-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221236817.5U Active CN217133576U (en) | 2022-05-20 | 2022-05-20 | Startup and shutdown circuit and equipment |
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| Country | Link |
|---|---|
| CN (1) | CN217133576U (en) |
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- 2022-05-20 CN CN202221236817.5U patent/CN217133576U/en active Active
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