Timing power-off circuit, HNB appliance and electronic equipment

Abstract

The utility model discloses a timing power-off circuit and electronic equipment, and belongs to the technical field of electronic circuits. A first key signal is output through a key circuit according to first operation; the first switch circuit transmits a power supply voltage based on the first key signal; the second switching circuit responds to the power supply voltage to output a control signal for a preset duration, and stops the output of the control signal after the power supply voltage is disconnected for the preset duration; a third switching circuit outputting the supply voltage in response to the control signal and disconnecting the supply voltage based on the stop of the control signal; therefore, the method is suitable for some microprocessor systems which do not support a low-power-consumption mode, and meanwhile, the port resources of the microprocessor are saved; and the timing power-off is realized only by using discrete devices after the key is pressed, and software control is not needed, so that the reliability of the timing power-off circuit is improved.

Description

Technical Field

[0001] This application belongs to the field of electronic circuit technology, and in particular relates to a timed power-off circuit and HNB appliances and electronic devices. Background Technology

[0002] Electronic devices (such as heat-not-burning (HNB) appliances) typically enter a sleep mode after the system has not performed any operations in order to extend standby time. The sleep mode still consumes some current, and the amount of current depends on the microprocessor model used. Therefore, there are certain restrictions in the selection of microprocessors, namely, the selected microprocessor must support low-power mode.

[0003] Some solutions employ a combination of hardware and software to force a system power-off. The logic of this approach is as follows: the power switch closes the moment the button is pressed, powering on the system. After the microprocessor powers on, it immediately outputs a power control signal to close the power switch, even if the button has been released. After detecting no operation for a preset time, the microprocessor outputs another power control signal to open the power switch, thus powering off the system. However, this solution requires one output port of the microcontroller to open the power switch, and the power control signal may fail if the system malfunctions and freezes, resulting in low reliability.

[0004] Therefore, the related timed power-off circuits have low reliability and occupy a lot of port resources. Utility Model Content

[0005] The purpose of this application is to provide a timed power-off circuit and HNB devices and electronic equipment, aiming to solve the problems of low reliability and excessive port resource occupation of related timed power-off circuits.

[0006] This application provides a timed power-off circuit, including:

[0007] A button circuit is used to output a first button signal according to a first operation.

[0008] A first switching circuit is connected to the button circuit and is used to transmit power supply voltage based on the first button signal.

[0009] The second switching circuit is connected to the first switching circuit and is used to output a control signal for a preset duration in response to the power supply voltage, and to stop the output of the control signal after the power supply voltage is disconnected for a preset duration.

[0010] A third switching circuit, connected to the second switching circuit, is used to output the power supply voltage in response to the control signal, and to disconnect the power supply voltage based on the stop of the control signal.

[0011] In one embodiment, it further includes:

[0012] A control circuit, connected to the third switching circuit, is used to power on according to the supply voltage.

[0013] In one embodiment, the button circuit is further configured to output a second button signal according to the second operation within the preset duration;

[0014] The control circuit is connected to the button circuit, the first switch circuit, and the third switch circuit, and is specifically used to power on according to the power supply voltage, and to perform corresponding actions based on the characteristic parameters of the first button signal and / or the characteristic parameters of the second button signal.

[0015] In one embodiment, the control circuitry includes a microprocessor;

[0016] The power supply terminal of the microprocessor constitutes the power supply voltage input terminal of the control circuit and is connected to the third switching circuit to receive the power supply voltage.

[0017] The first general-purpose input / output terminal of the microprocessor constitutes the key signal input terminal of the control circuit, and is connected to the first switch circuit and the key circuit to receive the first key signal and the second key signal.

[0018] The ground terminal of the microprocessor is connected to the power supply ground.

[0019] In one embodiment, the button circuit includes a button K1;

[0020] The first end of the button K1 constitutes the output end of the button circuit, and is connected to the control circuit and the first switch circuit to output the first button signal or the second button signal.

[0021] The second end of the button K1 is connected to the power ground.

[0022] In one embodiment, the first switching circuit includes a first field-effect transistor and a first resistor;

[0023] The source of the first field-effect transistor and the first end of the first resistor are connected and together form the input terminal of the first switching circuit, which is connected to the third switching circuit to receive the power supply voltage.

[0024] The gate of the first field-effect transistor and the second end of the first resistor are connected and together form the control terminal of the first switching circuit, which is connected to the button circuit to receive the button signal;

[0025] The drain of the first field-effect transistor forms the output terminal of the first switching circuit, which is connected to the second switching circuit to output the supply voltage.

[0026] In one embodiment, the second switching circuit includes a second field-effect transistor, a first capacitor, and a second resistor;

[0027] The gate of the second field-effect transistor, the first terminal of the first capacitor, and the first terminal of the second resistor are connected and together form the control terminal of the second switching circuit, which is connected to the first switching circuit to receive the power supply voltage.

[0028] The drain of the second field-effect transistor forms the output terminal of the second switching circuit, which is connected to the third switching circuit to output the control signal;

[0029] The source of the second field-effect transistor, the second terminal of the first capacitor, and the second terminal of the second resistor are all connected to the power supply ground.

[0030] In one embodiment, the third switching circuit includes a third field-effect transistor and a third resistor;

[0031] The source of the third field-effect transistor and the first end of the third resistor are connected and together form the input terminal of the third switching circuit, which is connected to the first switching circuit to receive the power supply voltage.

[0032] The gate of the third field-effect transistor and the second end of the third resistor are connected and together form the control terminal of the third switching circuit, which is connected to the second switching circuit to receive the control signal;

[0033] The drain of the third field-effect transistor forms the output terminal of the third switching circuit to output the supply voltage.

[0034] This utility model embodiment also provides an HNB device, which includes the above-described timed power-off circuit.

[0035] This utility model embodiment also provides an electronic device, which includes the above-described timed power-off circuit.

[0036] The beneficial effects of this utility model embodiment compared with the prior art are as follows: Since the second switching circuit responds to the power supply voltage and outputs a control signal for a preset duration, and the third switching circuit responds to the control signal and outputs the power supply voltage; then, the second switching circuit stops outputting the control signal after the power supply voltage is disconnected for a preset duration; the third switching circuit disconnects the power supply voltage based on the control signal; therefore, there is no need for the microprocessor to output a power control signal through the output port to disconnect the power switch after no operation for a preset duration, which is suitable for some microprocessor systems that do not support low-power mode. At the same time, it saves the port resources of the microprocessor; and only discrete components are used to realize the timed power-off after the button is pressed, without software control, which improves the reliability of the timed power-off circuit. Attached Figure Description

[0037] To more clearly illustrate the technical utility model in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a timed power-off circuit provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of another structure of a timed power-off circuit provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of another structure of a timed power-off circuit provided in an embodiment of this application;

[0041] Figure 4 This is a partial example circuit diagram of a timed power-off circuit provided in an embodiment of this application. Detailed Implementation

[0042] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0044] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0046] Figure 1 A schematic diagram of the timed power-off circuit provided in a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0047] The aforementioned timed power-off circuit includes a button circuit 01, a first switch circuit 02, a second switch circuit 03, and a third switch circuit 04.

[0048] Key circuit 01 is used to output a first key signal according to the first operation;

[0049] The first switch circuit 02 is connected to the button circuit 01 and is used to transmit the power supply voltage based on the first button signal.

[0050] The second switching circuit 03 is connected to the first switching circuit 02 and is used to output a control signal for a preset duration in response to the power supply voltage, and to stop outputting the control signal after the power supply voltage is disconnected for a preset duration.

[0051] The third switching circuit 04 is connected to the second switching circuit 03 and is used to output the power supply voltage in response to the control signal, and to disconnect the power supply voltage based on the control signal to stop.

[0052] It should be noted that the first switching circuit 02, the second switching circuit 03, and the third switching circuit 04 may each include a switching transistor. The button circuit 01 may include a button.

[0053] Understandably, firstly, the first switch circuit 02 transmits the power supply voltage based on the first button signal; then, the second switch circuit 03 responds to the power supply voltage and outputs a control signal of a preset duration, so that the third switch circuit 04 responds to the control signal of a preset duration and outputs the power supply voltage of a preset duration; finally, the third switch circuit 04 stops outputting the control signal after the power supply voltage is disconnected for a preset duration, so that the third switch circuit 04 disconnects the power supply voltage based on the stop of the control signal; thereby realizing timed power-off after the button is pressed.

[0054] like Figure 2 As shown, the aforementioned timed power-off circuit also includes a control circuit 05.

[0055] Control circuit 05 is connected to the third switch circuit 04 and is used to power on according to the supply voltage.

[0056] It is understandable that the timed power-off circuit supplies power to the control circuit 05 for a preset duration and then cuts off the power at the set time.

[0057] The above technical solution is applicable to electronic devices that start heating with a button. After the system is powered off, it can greatly reduce system power consumption and extend standby time. It is also suitable for microprocessor systems that do not support low-power mode.

[0058] The button circuit 01 is also used to output a second button signal according to the second operation within a preset time period; such as Figure 3 As shown, the control circuit 05 is connected to the button circuit 01, the first switch circuit 02 and the third switch circuit 04. Specifically, it is used to power on according to the power supply voltage and to perform corresponding actions based on the characteristic parameters of the first button signal and / or the characteristic parameters of the second button signal.

[0059] It is understandable that after the control circuit 05 is powered on, it can detect the characteristic parameters of the first key signal (such as key duration and level). Within the preset time after power-on, the control circuit 05 also detects the characteristic parameters of the first key signal (such as the number of key presses, key duration and level), and thus performs corresponding actions based on the characteristic parameters of the first key signal and / or the characteristic parameters of the second key signal.

[0060] For example, when a timed power-off circuit is applied to HNB appliances, it can be set to activate the child lock function by clicking the button 5 times consecutively, and deactivate the child lock function by clicking the button 5 times consecutively again; press and hold the button to activate the heating function; click the button 3 times consecutively to switch the heating temperature curve, which refers to the curve of heating temperature changing with temperature.

[0061] The above technical solution not only achieves the timed power-off function, but also realizes multiple application functions, enriching the product's functionality.

[0062] Figure 4The illustration shows a partial example circuit structure of a timed power-off circuit provided in an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below:

[0063] The control circuit 05 includes a microprocessor U1.

[0064] The power supply terminal VCC of the microprocessor U1 forms the power supply voltage input terminal of the control circuit 05 and is connected to the third switch circuit 04 to receive the power supply voltage; the first general-purpose input / output terminal P1.0 of the microprocessor U1 forms the key signal input terminal of the control circuit 05 and is connected to the first switch circuit 02 and the key circuit 01 to receive the first key signal and the second key signal; the ground terminal GND of the microprocessor U1 is connected to the power supply ground.

[0065] The control circuit is simple and reliable.

[0066] The button circuit 01 includes button K1.

[0067] The first end of button K1 forms the output end of button circuit 01, which is connected to control circuit 05 and first switch circuit 02 to output the first button signal or the second button signal; the second end of button K1 is connected to power ground.

[0068] The button circuit 01 is simple and reliable.

[0069] The first switching circuit 02 includes a first field-effect transistor M1 and a first resistor R1.

[0070] The source of the first field-effect transistor M1 and the first end of the first resistor R1 are connected and together form the input terminal of the first switching circuit 02, which is connected to the third switching circuit 04 to receive the power supply voltage; the gate of the first field-effect transistor M1 and the second end of the first resistor R1 are connected and together form the control terminal of the first switching circuit 02, which is connected to the button circuit 01 to receive the button signal; the drain of the first field-effect transistor M1 forms the output terminal of the first switching circuit 02, which is connected to the second switching circuit 03 to output the power supply voltage.

[0071] It is understandable that the first field-effect transistor M1 can be a P-type field-effect transistor.

[0072] The second switching circuit 03 includes a second field-effect transistor M2, a first capacitor C1, and a second resistor R2;

[0073] The gate of the second field-effect transistor M2, the first terminal of the first capacitor C1, and the first terminal of the second resistor R2 are connected and together form the control terminal of the second switching circuit 03, which is connected to the first switching circuit 02 to receive the power supply voltage; the drain of the second field-effect transistor M2 forms the output terminal of the second switching circuit 03, which is connected to the third switching circuit 04 to output the control signal; the source of the second field-effect transistor M2, the second terminal of the first capacitor C1, and the second terminal of the second resistor R2 are all connected to the power supply ground.

[0074] It is understandable that the second field-effect transistor M2 can be an N-type field-effect transistor. The preset duration is related to the capacitance value of the first capacitor C1 and the resistance value of the second resistor R2.

[0075] By setting a capacitor and a resistor between the gate and source of the second field-effect transistor M2, the function of delaying the disconnection of the control signal is realized, thereby realizing timed power-off.

[0076] The third switching circuit 04 includes a third field-effect transistor M3 and a third resistor R3.

[0077] The source of the third field-effect transistor M3 and the first end of the third resistor R3 are connected and together form the input terminal of the third switching circuit 04, which is connected to the first switching circuit 02 to receive the power supply voltage; the gate of the third field-effect transistor M3 and the second end of the third resistor R3 are connected and together form the control terminal of the third switching circuit 04, which is connected to the second switching circuit 03 to receive the control signal; the drain of the third field-effect transistor M3 forms the output terminal of the third switching circuit 04 to output the power supply voltage.

[0078] It is understandable that the third field-effect transistor M3 can be a P-type field-effect transistor.

[0079] The following is based on the working principle. Figure 4 Further explanation is provided below:

[0080] When button K1 is not pressed, the button K1 disconnects the button signal output. The gate of the first field-effect transistor M1 is pulled up to the supply voltage by the first resistor R1, and the first field-effect transistor M1 is cut off, disconnecting the supply voltage output. The gate of the second field-effect transistor M2 is pulled down to the power supply ground by the second resistor R2, and the second field-effect transistor M2 is cut off, disconnecting the control signal output. The gate of the third field-effect transistor M3 is pulled up to the supply voltage by the third resistor R3, and the third field-effect transistor M3 is cut off, disconnecting the supply voltage output. The microprocessor U1 is not powered, and the system is powered down.

[0081] When button K1 is pressed, the first terminal of button K1 outputs a first button signal (low level). The gate of the first field-effect transistor M1 is connected to the first button signal (pulled down to power ground by button K1), the first field-effect transistor M1 conducts and transmits the supply voltage, charging the first capacitor C1. The gate of the second field-effect transistor M2 is connected to the supply voltage, the second field-effect transistor M2 conducts and outputs a control signal (low level). The gate of the third field-effect transistor M3 is connected to the control signal, the third field-effect transistor M3 conducts and transmits the supply voltage, thus powering on the microprocessor U1 and the system. It should be noted that the first general-purpose input / output terminal P1.0 of the microprocessor U1 is connected to the first button signal, and the microprocessor U1 can detect the characteristic parameters of the first button signal after power-on.

[0082] When the button is released after the microprocessor U1 is powered on, the first field-effect transistor M1 is immediately turned off. Since the first capacitor C1 is fully charged, it discharges through the second resistor R2. The discharge rate is related to the capacitance of the first capacitor C1 and the resistance of the second resistor R2. Within a preset time period when the voltage on the first capacitor C1 drops to the threshold voltage of the second field-effect transistor M2, the second field-effect transistor M2 remains on. Therefore, the third field-effect transistor M3 remains on, that is, the microprocessor U1 remains powered on until the voltage on the first capacitor C1 drops below the threshold voltage of the second field-effect transistor M2.

[0083] Within a preset time period, button K1 outputs a second button signal to the first general-purpose input / output terminal P1.0 of microprocessor U1 according to the second operation; microprocessor U1 executes corresponding actions based on the characteristic parameters of the first button signal and / or the characteristic parameters of the second button signal.

[0084] This utility model embodiment also provides an HNB device, which includes the above-described timed power-off circuit.

[0085] This utility model embodiment also provides an electronic device, which includes the above-described timed power-off circuit.

[0086] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0087] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A timed power-off circuit, characterized in that, include: A button circuit is used to output a first button signal according to a first operation. A first switching circuit is connected to the button circuit and is used to transmit power supply voltage based on the first button signal. The second switching circuit is connected to the first switching circuit and is used to output a control signal for a preset duration in response to the power supply voltage, and to stop the output of the control signal after the power supply voltage is disconnected for a preset duration. A third switching circuit, connected to the second switching circuit, is used to output the power supply voltage in response to the control signal, and to disconnect the power supply voltage based on the stop of the control signal.

2. The timed power-off circuit as described in claim 1, characterized in that, Also includes: A control circuit, connected to the third switching circuit, is used to power on according to the supply voltage.

3. The timed power-off circuit as described in claim 1, characterized in that, The button circuit is also used to output a second button signal according to the second operation within the preset time period; The control circuit is connected to the button circuit, the first switch circuit, and the third switch circuit, and is specifically used to power on according to the power supply voltage, and to perform corresponding actions based on the characteristic parameters of the first button signal and / or the characteristic parameters of the second button signal.

4. The timed power-off circuit as described in claim 3, characterized in that, The control circuit includes a microprocessor; The power supply terminal of the microprocessor constitutes the power supply voltage input terminal of the control circuit and is connected to the third switching circuit to receive the power supply voltage. The first general-purpose input / output terminal of the microprocessor constitutes the key signal input terminal of the control circuit, and is connected to the first switch circuit and the key circuit to receive the first key signal and the second key signal. The ground terminal of the microprocessor is connected to the power supply ground.

5. The timed power-off circuit as described in claim 3, characterized in that, The button circuit includes button K1; The first end of the button K1 constitutes the output end of the button circuit, and is connected to the control circuit and the first switch circuit to output the first button signal or the second button signal. The second end of the button K1 is connected to the power ground.

6. The timed power-off circuit as described in claim 1, characterized in that, The first switching circuit includes a first field-effect transistor and a first resistor; The source of the first field-effect transistor and the first end of the first resistor are connected and together form the input terminal of the first switching circuit, which is connected to the third switching circuit to receive the power supply voltage. The gate of the first field-effect transistor and the second end of the first resistor are connected and together form the control terminal of the first switching circuit, which is connected to the button circuit to receive the button signal; The drain of the first field-effect transistor forms the output terminal of the first switching circuit, which is connected to the second switching circuit to output the supply voltage.

7. The timed power-off circuit as described in claim 1, characterized in that, The second switching circuit includes a second field-effect transistor, a first capacitor, and a second resistor; The gate of the second field-effect transistor, the first terminal of the first capacitor, and the first terminal of the second resistor are connected and together form the control terminal of the second switching circuit, which is connected to the first switching circuit to receive the power supply voltage. The drain of the second field-effect transistor forms the output terminal of the second switching circuit, which is connected to the third switching circuit to output the control signal; The source of the second field-effect transistor, the second terminal of the first capacitor, and the second terminal of the second resistor are all connected to the power supply ground.

8. The timed power-off circuit as described in claim 1, characterized in that, The third switching circuit includes a third field-effect transistor and a third resistor; The source of the third field-effect transistor and the first end of the third resistor are connected and together form the input terminal of the third switching circuit, which is connected to the first switching circuit to receive the power supply voltage. The gate of the third field-effect transistor and the second end of the third resistor are connected and together form the control terminal of the third switching circuit, which is connected to the second switching circuit to receive the control signal; The drain of the third field-effect transistor forms the output terminal of the third switching circuit to output the supply voltage.

9. An HNB device, characterized in that, The HNB device includes a timed power-off circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The electronic device includes a timed power-off circuit as described in any one of claims 1 to 8.

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