CN203616604U - A startup and shutdown control circuit and an electronic device - Google Patents
A startup and shutdown control circuit and an electronic device Download PDFInfo
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- CN203616604U CN203616604U CN201320846335.6U CN201320846335U CN203616604U CN 203616604 U CN203616604 U CN 203616604U CN 201320846335 U CN201320846335 U CN 201320846335U CN 203616604 U CN203616604 U CN 203616604U
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Abstract
The utility model discloses a startup and shutdown control circuit and an electronic device. A startup and shutdown button without a pressing maintenance function, two switch elements and one controller are comprised. A switch pathway of the first switch element is connected between a power supply power source and a power supply terminal of a system circuit. A control terminal is connected with the startup and shutdown button and a switch pathway of the second switch element. The controller detects the pressing states of the startup and shutdown button after power-on, and outputs enable signals to a control terminal of the second switch element. According to the utility model, the two switch elements are employed to ingeniously overlap, so that the startup and shutdown control circuit is constructed; precise detection of startup and shutdown states is realized; and precise control of the startup and shutdown states of the electronic device can be realized. The startup and shutdown control circuit and the electronic device are simple in structure, low in cost and stable in working performance. In addition, through the design of a reset button in the circuit, a reset function of the system is realized, and the startup and shutdown control circuit is suitable for being applied to various kinds of electronic devices needed to be without the pressing maintenance function.
Description
Technical field
The utility model belongs to power supply control technical field, specifically, relates to a kind of switching on and shutting down control circuit and adopts the electronic equipment of described switching on and shutting down control circuit design.
Background technology
Switching on and shutting down control circuit is widely used in current most electronic equipments, for being communicated with or cutting off the supply line between power supply and the circuit system of electronic equipment, realizes the switching on and shutting down control to electronic equipment.
Current switching on and shutting down control circuit, roughly adopt two kinds of designs: a kind of is the Design of Mechanical Structure that depends on keyswitch, needing to use to have to press keeps the mechanical key of function to carry out circuit design, after pressing, button maintains pressed state, the connection that keeps supply line, makes complete machine enter start operational mode; In the time again pushing button, button is upspring, and cuts off supply line, controls complete machine power-off shutdown.Another design is the on/off circuit adopting without pressing the button design that keeps function, due to button self latch-up-free function, therefore needs to design peripheral circuit the pressed state of button is detected in real time, and complete the break-make control of supply line.Front a kind of design need to be carried out particular design to the physical construction of button, and this button is for some digital product, can not meet the designing requirement that this series products is seen outside and used, and therefore suitable application area is very limited; Rear a kind of design only needs touch key, can complete the switching on and shutting down control of electronic equipment, aspect the satisfaction using aesthetic property and the user of raising product design, have more advantage, but need to design complicated peripheral circuit and realize the real-time detection to button pressed state, and supply line still needs to keep connected state after button is upspring, therefore, circuit design relative complex, hardware cost is relatively high.
Summary of the invention
The utility model, in order to solve existing employing without the high problem of on/off circuit complex structure, cost of pressing the button design that keeps function, has proposed a kind of switching on and shutting down control circuit and electronic equipment of brand new, and circuit design is simple, with low cost.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of switching on and shutting down control circuit, comprises that a nothing presses the switching on and shutting down button, two on-off elements and the controller that keep function; The switch ways of the first on-off element is connected between power supply and the power supply terminal of circuit system, and control end connects described switching on and shutting down button and the switch ways of second switch element; The pressed state of described controller detector switch machine button after powering on, and output enable signal to the control end of second switch element.
Further, the controlled conducting in the time that its control end is low level of described the first on-off element, the control end of described the first on-off element is leaded up to described switching on and shutting down button ground connection, separately leads up to the switch ways ground connection of second switch element.
Further again, the control end of described the first on-off element connects power supply by the first resistance, connects the switch ways of described second switch element by the second resistance.
In order to realize the accurate detection of controller to switching on and shutting down button pressed state, the control end of described the first on-off element is connected to controller Yi road and detect pin, controller, according to the low and high level state of described detection pin, can be judged the pressed state of described switching on and shutting down button exactly.
As another the circuit design mode that realizes the detection of switching on and shutting down button pressed state, in described switching on and shutting down control circuit, be also provided with the duodiode device of a differential concatenation, the negative electrode docking of described duodiode device, connect described switching on and shutting down button, two anodes connect one to one with the control end of controller Yi road detection pin and the first on-off element respectively, controller, according to the low and high level state of described detection pin, judges the pressed state of switching on and shutting down button.
As the third circuit design mode that realizes the detection of switching on and shutting down button pressed state, diode component and the 3rd resistance of series connection are further set in described switching on and shutting down control circuit, described the 3rd resistance is connected described switching on and shutting down button with the node side of diode component series connection, the other end of described diode component is connected with the detection pin of controller, and the other end of described the 3rd resistance connects the control end of described the first on-off element.
Preferably, the controlled conducting in the time that its control end is high level of described second switch element, described enable signal high level is effective; The control end of described second switch element, also by a reset key ground connection, can further reach the purpose of design of control system circuit reset thus.
Preferably, described the first on-off element preferably adopts P channel MOS tube, and source electrode connects described power supply, the power supply terminal of drain electrode connected system circuit; Described second switch element preferably adopts N-channel MOS pipe, and the drain electrode of described N-channel MOS pipe connects the grid of described P channel MOS tube, the source ground of N-channel MOS pipe, and grid receives the enable signal of controller output.
Preferably, described power supply is the direct supply by adapter or battery output.
For realizing aforementioned goal of the invention of the present utility model, the electronic equipment proposing for the utility model, is achieved by the following technical solutions:
A kind of electronic equipment, comprises that a nothing presses the switching on and shutting down button, two on-off elements and the controller that keep function; The switch ways of the first on-off element is connected between power supply and the power supply terminal of circuit system, and control end connects described switching on and shutting down button and the switch ways of second switch element; The pressed state of described controller detector switch machine button after powering on, and output enable signal to the control end of second switch element.
Compared with prior art, advantage of the present utility model and good effect are: the utility model adopts two ingenious overlap joints of on-off element, build switching on and shutting down control circuit, realize the accurate detection to switching on and shutting down button pressed state, and the accurate control that completes electronic equipment start, shuts down, not only circuit structure is simple, with low cost, stable work in work, and by design reset key in circuit, realize the reset function of system simultaneously, be applicable to being applied in various needs and select without pressing in the electronic equipment of button design that keeps function.
Read by reference to the accompanying drawings after the detailed description of the utility model embodiment, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the switching on and shutting down control circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the switching on and shutting down control circuit that proposes of the utility model;
Fig. 3 is the circuit theory diagrams of the third embodiment of the switching on and shutting down control circuit that proposes of the utility model;
Fig. 4 is the circuit theory diagrams of the 4th kind of embodiment of the switching on and shutting down control circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The present embodiment is for the button without pressing maintenance function, a kind of structural design of switching on and shutting down control circuit has been proposed, by selecting two ingenious overlap joints of on-off element, utilize one of them on-off element (hereinafter referred to as the first on-off element) to carry out break-make control to the supply line of circuit system, in the time that electronic equipment is started shooting, keep the switching on and shutting down button of function first to control the conducting in advance of the first on-off element by triggering without pressing, the supply line of connected system circuit, make the circuit system operation that powers on, then export effective enable signal by the controller in circuit system and control second switch element action (for example transferring conducting state to from off state), and then utilize second switch element to maintain the conducting state of the first on-off element, make power supply can be continuously circuit system power supply, controlling electronic equipment starts shooting and enters normal operation mode.During the normal operation of electronic equipment, detect in real time the pressed state of described switching on and shutting down button by controller, and in the time detecting that switching on and shutting down button is pressed, export invalid enable signal, for example, by controlling second switch element action (transferring off state to from conducting state), control the first on-off element and turn-off, with the current supply circuit of cutting system circuit, make circuit system power-off, electronic equipment shutdown, has realized the switching on and shutting down control to electronic equipment thus.
For the type selecting of the first on-off element and second switch element, when the present embodiment preferably adopts control end to be low level, the on-off element of controlled conducting such as, as the first described on-off element, P channel MOS tube or positive-negative-positive triode etc.; While selecting control end to be high level, the on-off element of controlled conducting is as described second switch element, such as N-channel MOS pipe or NPN type triode etc.; Select the MSP430F5504 of TI company as controller, the present embodiment is not limited in above giving an example.
The switch ways of the first on-off element is connected between power supply and the power supply terminal of circuit system, the supply line of circuit system is carried out to break-make control, the control end of the first on-off element is connected to second switch element, specifically can pass through the switch ways ground connection of second switch element, and by switching on and shutting down button ground connection.The control end of second switch element is connected to controller, receive the enable signal of controller output, utilize its break-make of enable signal control of controller output.Thus one, when user's push switch machine button in the time that electronic equipment is under off-mode, by switching on and shutting down button by the control end ground connection of the first on-off element, make the first on-off element because of its control end current potential be the low conducting state that enters, connect the current supply circuit of circuit system, allow power supply power to circuit system, make the circuit system operation that powers on.Because controller belongs to the part in circuit system, after circuit system powers on, controller is electrifying startup operation, the effective enable signal of output high level is to the control end of second switch element, control second switch element conductive, make the control end of the first on-off element by the switch ways ground connection of second switch element, thereby continue to drag down the control end current potential of the first on-off element, maintain the conducting state of the first on-off element, make power supply can be continuously circuit system uninterrupted power supply.Now, even if switching on and shutting down button lifts, the first on-off element also can remain conducting state, thereby has completed the start process of electronic equipment.
After electronic equipment start operation, utilize the pressed state of the real-time detector switch machine of controller button, again press when switching on and shutting down button being detected, or detect when switching on and shutting down button is again pressed and grows by time arrival setting threshold, the enable signal of output is set to invalid low level state, controls second switch element and turn-off.Now, if switching on and shutting down button still in pressed state, the first on-off element still maintains conducting, electronic equipment continue operation; In the time that switching on and shutting down button lifts, because the control end current potential of the first on-off element becomes height, thereby the first on-off element turn-offs rapidly, cuts off the power supply of power supply to circuit system, makes circuit system power down out of service, completes the shutdown process of electronic equipment.
Below using P channel MOS tube as the first described on-off element, take N-channel MOS pipe as described second switch element as example, by a specific embodiment, physical circuit assembling structure and the principle of work thereof of described switching on and shutting down control circuit are at length set forth.
Shown in Figure 1, the source electrode of P channel MOS tube Q1 is connected to power supply VBAT, described power supply VBAT should be direct supply, and the electric main rectifying conversion that can outside be introduced by the adapter circuit arranging in electronic equipment becomes galvanic current source to provide; Also can directly be provided by the battery output in electronic equipment, the present embodiment does not specifically limit this.By the power supply terminal VDC_IN of the drain electrode connected system circuit of P channel MOS tube Q1, in the time of P channel MOS tube Q1 conducting, receive direct supply VBAT, be the each electricity consumption load supplying in circuit system.The grid of described P channel MOS tube Q1 is connected to direct supply VBAT by the first resistance R 57, by switching on and shutting down button SWITCH_KEY ground connection, and connect the drain electrode of N-channel MOS pipe Q2 by the second resistance R 55.By the source ground of described N-channel MOS pipe Q2, grid directly connects or connects by resistance R 66 the MCU_I/O_EN end (being the Enable Pin of controller enable pin or controller) of controller, receives the enable signal of controller output.
In order to power at controller after operation, realize the real-time detection to switching on and shutting down button SWITCH_KEY pressed state, the present embodiment selects a wherein road input pin MCU_I/O_ON/OFF of controller as detecting pin, connect the grid of P channel MOS tube Q1, shown in Figure 1, by detecting the low and high level state of grid level of P channel MOS tube Q1, realize the accurate detection to switching on and shutting down button SWITCH_KEY pressed state.
The principle of work of the switching on and shutting down control circuit shown in Fig. 1 is: in the time that user need to control electronic equipment start operation, first press the switching on and shutting down button SWITCH_KEY on electronic equipment, due to one end ground connection of switching on and shutting down button SWITCH_KEY, the other end connects the grid of P channel MOS tube Q1, therefore the grid potential of P channel MOS tube Q1 can be dragged down, control P channel MOS tube Q1 and enter saturation conduction state, the current supply circuit of connected system circuit, realize the power supply of direct supply VBAT to circuit system, make respectively powering on by electric loading on circuit system, enter operational mode.
After circuit system powers on, the electrifying startup operation at once of the controller in circuit system, the effective enable signal of output high level, holds the grid that exports N-channel MOS pipe Q2 to by its MCU_I/O_EN, control N-channel MOS pipe Q2 saturation conduction.Now, the grid of P channel MOS tube Q1 is by the drain electrode of the second resistance R 55 and N-channel MOS pipe Q2, source ground, configure the resistance of the first resistance R 57 and the second resistance R 55, make two resistance R 57, the partial pressure value (be the magnitude of voltage of in Fig. 1 A node) of R55 to direct supply VBAT is far below the conduction threshold of P channel MOS tube Q1, thus one, even if switching on and shutting down button SWITCH_KEY now lifts, the grid voltage that also can guarantee P channel MOS tube Q1 is that low (the voltage is here low, not only refer to that current potential is zero, also think that for the magnitude of voltage of the conduction threshold much smaller than P channel MOS tube Q1 voltage is low here), thereby make P channel MOS tube Q1 keep saturation conduction state, control direct supply VBAT and be continuously circuit system power supply, realize electronic equipment start operation.
Because the conducting internal resistance of metal-oxide-semiconductor is minimum, therefore the conduction voltage drop of loss on P channel MOS tube Q1 is extremely low, substantially can not exert an influence to the power supply of direct supply VBAT, and aspect reduction system power dissipation, effect is remarkable.
Certainly, also can select a positive-negative-positive triode to replace described P channel MOS tube Q1, be connected between the power supply terminal VDC_IN of direct supply VBAT and circuit system, realize the power supply control to circuit system.But, in the time selecting positive-negative-positive triode to replace P channel MOS tube Q1 to carry out the specific design of switching on and shutting down control circuit, because the conducting internal resistance of positive-negative-positive triode is relatively large, therefore can produce at the two ends of positive-negative-positive triode the conduction voltage drop of certain amplitude.This,, for the required supply voltage amplitude of the circuit system electronic equipment far away apart from the voltage magnitude of direct supply VBAT, can not produce any impact to the normal power supply of circuit system; But approach the situation of the voltage magnitude of direct supply VBAT for the required supply voltage amplitude of circuit system, likely can be due to the existence of the conduction voltage drop of positive-negative-positive triode, the power supply that causes transferring to circuit system can not meet on circuit system some by the power demands of electric loading.Therefore,, in the time that the first on-off element is carried out to parts selection, need carry out choose reasonable according to the actual electricity consumption situation of direct supply VBAT and circuit system.
In the process of the normal operation of circuit system, if user wants to control electronic equipment shutdown, can again press switching on and shutting down button SWITCH_KEY.The situation of the abnormal shutdown of electronic equipment causing for fear of misoperation occurs, and the present embodiment preferably adopts length to control electronic equipment shutdown by the mode of operation of switching on and shutting down button SWITCH_KEY.Specifically, when user need to control electronic equipment when shutdown, press for a long time switching on and shutting down button SWITCH_KEY, now, the magnitude of voltage that the detection pin MCU_I/O_ON/OFF of controller can detect node A is greater than zero partial pressure value from one and becomes 0V.Be set to 0V and duration while having reached setting threshold when controller detects the current potential of its pin MCU_I/O_ON/OFF, judge that user has carried out power-off operation.Now, enable signal is set to invalid low level state by controller, controls N-channel MOS pipe Q2 cut-off.If close and have no progeny at N-channel MOS pipe Q2, switching on and shutting down button SWITCH_KEY is still in down state, P channel MOS tube Q1 keeps conducting state, circuit system continues operation, until after switching on and shutting down button SWITCH_KEY lifts, P channel MOS tube Q1 is because its grid potential is by moving direct supply VBAT in the first resistance R 57, and the grid voltage that causes P channel MOS tube Q1 equals its source voltage and proceeds to cut-off state, and then the current supply circuit of cutting system circuit, control system down circuitry, electronic equipment shutdown.
Certainly, described N-channel MOS pipe Q2 also can select NPN type triode to replace, be connected to the grid of P channel MOS tube Q1 and systematically between, under the control action of the enable signal of exporting at controller, control P channel MOS tube Q1 and maintain conducting state or proceed to off state, realize the switching on and shutting down control to electronic equipment.
In order to improve switching on and shutting down control circuit reliability of operation, the present embodiment is preferably set up the duodiode device D21 of a differential concatenation in switching on and shutting down control circuit, as shown in Figure 2.Two negative electrode docking of described duodiode device D21, connect described switching on and shutting down button SWITCH_KEY, and by described switching on and shutting down button SWITCH_KEY ground connection.By the control end of one of them anodic bonding the first on-off element of duodiode device D21, for example grid of P channel MOS tube Q1, the detection pin MCU_I/O_ON/OFF of controller described in another anodic bonding.In the time that user presses the start of switching on and shutting down button SWITCH_KEY control electronic equipment, a wherein road diode D1 conducting in duodiode device D21, by the grid of P channel MOS tube Q1 by switching on and shutting down button SWITCH_KEY ground connection, drag down the grid potential of P channel MOS tube Q1, control the grid saturation conduction of P channel MOS tube Q1, the current supply circuit of connected system circuit, completes the start operational process of electronic equipment.Treat that circuit system powers on, controller starts after operation, putting its detection pin MCU_I/O_ON/OFF is high level, this high level is due to exist (characteristic of utilizing the reverse-biased cut-off of diode D1) of diode D1 in duodiode device D21, therefore, can not exert an influence to the grid potential of P channel MOS tube Q1, thereby guarantee the normal operation of switching on and shutting down control circuits.
Please refer to shown in Fig. 4, in order to improve switching on and shutting down control circuit reliability of operation, diode component D3 and the 3rd resistance R 3 of series connection can also be set in other embodiment of the present invention in described switching on and shutting down control circuit, and the node that described the 3rd resistance R 3 is connected with diode component D3 is connected to described switching on and shutting down button SWITCH_KEY; The other end of diode component D3 is connected with the detection pin MCU_I/O_ON/OFF of described controller MCU; The other end of described the 3rd resistance R 3 is connected to the control end (being the grid of P channel MOS tube Q1) of described the first on-off element.Wherein, the resistance of the 3rd resistance R 3 chooses to make the first on-off element conducting be advisable.
In the time controlling electronic equipment shutdown with the head of a household by switching on and shutting down button SWITCH_KEY, the detection pin MCU_I/O_ON/OFF of controller is by the other road diode D2 conducting in duodiode device D21 (or diode component D3 conducting) in Fig. 4, and via switching on and shutting down button SWITCH_KEY ground connection, thereby drag down the current potential that detects pin MCU_I/O_ON/OFF.In the time that controller detects that its current potential that detects pin MCU_I/O_ON/OFF is dragged down and the duration reaches setting threshold, judge that user has carried out power-off operation, then the enable signal of putting its I/O mouth MCU_I/O_EN output is low level, turn-off by controlling second switch element, for example control N-channel MOS pipe Q2 cut-off, and then control P channel MOS tube Q1 and turn-off, cut off the power supply of direct supply VBAT to circuit system, the shutdown of control electronic equipment, response user operation.
In the time selecting duodiode device D21 to carry out the line design of switching on and shutting down control circuit, for the consideration of simplifying circuit structure, reduction hardware cost aspect, also can save the second resistance R 55, shown in Figure 3, can meet equally design needs.Its principle of work is with the above-mentioned associated description to Fig. 2, and the present embodiment no longer launches explanation at this.
On the basis of the said structure design of the switching on and shutting down control circuit proposing in various embodiments of the present invention, can also further set up a reset key RESET at the control end of second switch element, shown in Fig. 1-Fig. 4, for example reset key RESET is connected to the grid of N-channel MOS pipe Q2 and systematically between, by triggering reset key RESET, realize the reset control to circuit system.
Specific works principle is: when after electronic equipment start operation, if user need to reset to circuit system, press in short time reset key RESET, the grid potential of N-channel MOS pipe Q2 is dragged down, controlling N-channel MOS pipe Q2 moment turn-offs, then (what now export due to the MCU_I/O_EN pin of controller is high level in rapidly conducting, therefore can be after reset key RESET lifts, control rapidly N-channel MOS pipe Q2 conducting again), and then make the instantaneous shutoff of P channel MOS tube Q1 as the first on-off element, control system circuit power-off reset, then again proceed to normal operation mode.
The switching on and shutting down control circuit of the present embodiment adopts simple circuit structure to reach the purpose of design of start, shutdown and system reset, compared with existing on/off circuit, mentality of designing is more ingenious, and circuit structure is simpler, has reached the purpose of design of saving hardware cost.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection domain of the present utility model.
Claims (10)
1. a switching on and shutting down control circuit, is characterized in that: comprising that a nothing is pressed keeps switching on and shutting down button, two on-off elements and a controller of function; The switch ways of the first on-off element is connected between power supply and the power supply terminal of circuit system, and control end connects described switching on and shutting down button and the switch ways of second switch element; The pressed state of described controller detector switch machine button after powering on, and output enable signal to the control end of second switch element.
2. switching on and shutting down control circuit according to claim 1, it is characterized in that: the controlled conducting in the time that its control end is low level of described the first on-off element, the control end of described the first on-off element is leaded up to described switching on and shutting down button ground connection, separately leads up to the switch ways ground connection of second switch element.
3. switching on and shutting down control circuit according to claim 2, is characterized in that: the control end of described the first on-off element connects power supply by the first resistance, connects the switch ways of described second switch element by the second resistance.
4. switching on and shutting down control circuit according to claim 3, it is characterized in that: the control end of described the first on-off element connects controller Yi road and detects pin, controller, according to the low and high level state of described detection pin, judges the pressed state of switching on and shutting down button.
5. switching on and shutting down control circuit according to claim 1, it is characterized in that: the duodiode device that is also provided with a differential concatenation in described switching on and shutting down control circuit, the negative electrode docking of described duodiode device, connect described switching on and shutting down button, two anodes connect one to one with the control end of controller Yi road detection pin and the first on-off element respectively, controller, according to the low and high level state of described detection pin, judges the pressed state of switching on and shutting down button.
6. switching on and shutting down control circuit according to claim 1, it is characterized in that: the diode component and the 3rd resistance that in described switching on and shutting down control circuit, are also provided with series connection, described the 3rd resistance is connected described switching on and shutting down button with the node side of diode component series connection, the other end of described diode component is connected with the detection pin of controller, and the other end of described the 3rd resistance connects the control end of described the first on-off element.
7. switching on and shutting down control circuit according to claim 1, is characterized in that: the controlled conducting in the time that its control end is high level of described second switch element, and described enable signal high level is effective; The control end of described second switch element is also by a reset key ground connection.
8. according to the switching on and shutting down control circuit described in any one in claim 1 to 7, it is characterized in that: described the first on-off element is P channel MOS tube, source electrode connects described power supply, the power supply terminal of drain electrode connected system circuit; Described second switch element is N-channel MOS pipe, and the drain electrode of described N-channel MOS pipe connects the grid of described P channel MOS tube, the source ground of N-channel MOS pipe, and grid receives the enable signal of controller output.
9. according to the switching on and shutting down control circuit described in any one in claim 1 to 7, it is characterized in that: described power supply is the direct supply by adapter or battery output.
10. an electronic equipment, is characterized in that: be provided with the switching on and shutting down control circuit as described in any one claim in claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320846335.6U CN203616604U (en) | 2013-12-20 | 2013-12-20 | A startup and shutdown control circuit and an electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320846335.6U CN203616604U (en) | 2013-12-20 | 2013-12-20 | A startup and shutdown control circuit and an electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN203616604U true CN203616604U (en) | 2014-05-28 |
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| CN201320846335.6U Expired - Lifetime CN203616604U (en) | 2013-12-20 | 2013-12-20 | A startup and shutdown control circuit and an electronic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530339A (en) * | 2015-12-01 | 2016-04-27 | 华勤通讯技术有限公司 | Mobile terminal and forced shutdown circuit thereof |
| CN109936354A (en) * | 2017-12-19 | 2019-06-25 | 炬芯（珠海）科技有限公司 | A kind of on/off circuit |
| CN109981090A (en) * | 2019-04-26 | 2019-07-05 | 福建科立讯通信有限公司 | A kind of Sofe Switch electromechanics road that can restore on-off state automatically |
-
2013
- 2013-12-20 CN CN201320846335.6U patent/CN203616604U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530339A (en) * | 2015-12-01 | 2016-04-27 | 华勤通讯技术有限公司 | Mobile terminal and forced shutdown circuit thereof |
| CN105530339B (en) * | 2015-12-01 | 2018-09-04 | 华勤通讯技术有限公司 | A kind of mobile terminal and its circuit for forced shutdown |
| CN109936354A (en) * | 2017-12-19 | 2019-06-25 | 炬芯（珠海）科技有限公司 | A kind of on/off circuit |
| CN109936354B (en) * | 2017-12-19 | 2023-03-28 | 炬芯科技股份有限公司 | Startup and shutdown circuit |
| CN109981090A (en) * | 2019-04-26 | 2019-07-05 | 福建科立讯通信有限公司 | A kind of Sofe Switch electromechanics road that can restore on-off state automatically |
| CN109981090B (en) * | 2019-04-26 | 2022-10-25 | 福建科立讯通信有限公司 | Soft on-off circuit capable of automatically recovering on-off state |
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