CN102214990A - Power control circuit, power control system applying same and control method - Google Patents
Power control circuit, power control system applying same and control method Download PDFInfo
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- CN102214990A CN102214990A CN2010101435820A CN201010143582A CN102214990A CN 102214990 A CN102214990 A CN 102214990A CN 2010101435820 A CN2010101435820 A CN 2010101435820A CN 201010143582 A CN201010143582 A CN 201010143582A CN 102214990 A CN102214990 A CN 102214990A
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Abstract
The invention provides a power control circuit, a power control system applying the same and a control method. The power control circuit provided by the invention is coupled between a power supply and a subsystem and comprises a logical operation element and a switching element; the logical operation element is provided with a first input end, a second input end and an output end; the first input end and the second input end are used for receiving a first control signal and a second control signal respectively; the output end is used for outputting a third control signal; the switching element is coupled with the power supply, the output end of the logical operation element and the subsystem; and the switching element is used for controlling the power supply to provide power for the subsystem according to the state of the third control signal.
Description
Technical field
The present invention is relevant for a kind of power supply control technology, particularly relevant for a kind of power control circuit and use its power control system and control method.
Background technology
At present, hypotactic system applies is very extensive.Wherein, main system sends a control signal to a switch element by a control pin, with the on/off of control subsystem, reaches the function of open and close subsystem.
Yet this circuit structure but exists the problem of electric leakage.That is, because there are time-delay characteristics in switch element, therefore after main system was closed, subsystem was not to close immediately.Thus, subsystem promptly can leak off to main system by the input/output interface that links to each other with main system.Being used for the control pin of control switch element this moment in the main system obtains voltage again once again, makes switch element continue to keep conducting state, forming circuit deadlock.Subsystem promptly can't be closed.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of power control circuit and use its power control system and control method, to improve the disappearance of prior art.
According to a purpose of the present invention, power control circuit provided by the invention is coupled between power supply unit and the subsystem.Power control circuit comprises logic arithmetic element and switch element.Logic arithmetic element has first input end, second input and output, and the first input end and second input receive first control signal and second control signal respectively, and output is exported the 3rd control signal.Switch element couples the output and the subsystem of power supply unit, logic arithmetic element, and switch element is controlled power supply unit according to the state of the 3rd control signal provides power supply to subsystem.
According to a preferred embodiment of the present invention, power control circuit also comprises power supply changeover device, couples power supply unit and main system.Power supply changeover device has Enable Pin to receive first control signal, and power supply changeover device is controlled power supply unit according to the state of first control signal provides power supply to main system.
According to a preferred embodiment of the present invention, when the state of first control signal was high level, power supply changeover device control power supply unit provided power supply to main system.
According to a preferred embodiment of the present invention, logic arithmetic element is and door.
According to a preferred embodiment of the present invention, switch element is a metal-oxide half field effect transistor.
According to a preferred embodiment of the present invention, metal-oxide half field effect transistor is a P type metal-oxide half field effect transistor.
According to another object of the present invention, power control system provided by the invention comprises power supply unit, subsystem and power control circuit.Power control circuit is coupled between power supply unit and the subsystem.Power control circuit comprises logic arithmetic element and switch element.Logic arithmetic element has first input end, second input and output, and the first input end and second input receive first control signal and second control signal respectively, and output is exported the 3rd control signal.Switch element couples the output and the subsystem of power supply unit, logic arithmetic element, and switch element is controlled power supply unit according to the state of the 3rd control signal provides power supply to subsystem.
According to a preferred embodiment of the present invention, power control system also comprises main system, and main system output second controls signal to second input of logic arithmetic element.
According to a preferred embodiment of the present invention, power control circuit also comprises power supply changeover device, couples power supply unit and main system.Power supply changeover device has Enable Pin to receive first control signal, and power supply changeover device is controlled power supply unit according to the state of first control signal provides power supply to main system.
According to a preferred embodiment of the present invention, when the state of first control signal was high level, power supply changeover device control power supply unit provided power supply to main system.
According to a preferred embodiment of the present invention, logic arithmetic element is and door.
According to a preferred embodiment of the present invention, switch element is a metal-oxide half field effect transistor.
According to a preferred embodiment of the present invention, metal-oxide half field effect transistor is a P type metal-oxide half field effect transistor.
According to a further object of the present invention, power control method provided by the invention is applied to power control circuit.Power control method comprises the steps.Receive first control signal and second control signal.Export the 3rd control signal.Controlling power supply unit according to the state of the 3rd control signal provides power supply to subsystem.
According to a preferred embodiment of the present invention, power control method comprises that also controlling power supply unit according to the state of first control signal provides power supply to main system.
According to a preferred embodiment of the present invention, main system output second controls signal to power control circuit.
According to a preferred embodiment of the present invention, when the state of first control signal was high level, the control power supply unit provided power supply to main system.
According to power control circuit provided by the invention and use its power control system and control method, it utilizes first control signal and second control signal to come common control switch element, resolution system electric leakage and the problem that can't turn-off fully.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the functional block diagram according to the power control system of a preferred embodiment of the present invention.
Fig. 2 is the flow chart according to the power control method of a preferred embodiment of the present invention.
Embodiment
Fig. 1 is the functional block diagram according to the power control system of a preferred embodiment of the present invention.Please refer to Fig. 1.In the present embodiment, power control system 1 comprises power supply unit 2, main system 3, subsystem 4 and power control circuit 5.Power control circuit 5 is coupled between power supply unit 2 and main system 3, the subsystem 4, and controlling power supply unit 2 thus provides power supply to main system 3 and subsystem 4 respectively.Also carry out communication between main system 3 and the subsystem 4 by input/output bus IOs.
In the present embodiment, power control circuit 5 comprises power supply changeover device 51, logic arithmetic element 52 and switch element 53.Power supply changeover device 51 couples power supply unit 2 and main system 3.Switch element 53 couples power supply unit 2, logic arithmetic element 52 and subsystem 4.Yet the present invention does not do any qualification to this.
In the present embodiment, power supply changeover device 51 can be the direct current transducer that always circulates, and is converted to the required power supply of main system 3 with the DC power supply that power supply unit 2 is provided.Yet the present invention does not do any qualification to this.In other embodiments, when the power supply that provides when power supply unit 2 is alternating current, this power supply changeover device 51 also can be one exchange to change direct current transducer, when perhaps the power supply that provides when power supply unit 2 has promptly met the required power supply of main system 3, also this power supply changeover device 51 can be set.
In the present embodiment, power supply changeover device 51 has Enable Pin 511, in order to receive the first control signal S1.Power supply changeover device 51 can be controlled power supply unit 2 according to the state of the first control signal S1 provides power supply to main system 3.Particularly, the first control signal S1 can be the control signal of an outside input, and when the state of the first control signal S1 was high level, power supply changeover device 51 enabled, thereby after conversion, export the power supply that power supply unit 2 provides to main system 3, so that main system 3 powers on.At this moment, the state correspondence of the second control signal S2 of control pin 31 outputs of main system 3 can be high level, and perhaps, the state of the second control signal S2 also can be low level.Otherwise, when the state of the first control signal S1 is low level, power supply changeover device 51 forbidden energy, the power supply that power supply unit 2 provides can't export main system 3 to, and main system 3 is promptly cut off the power supply.Yet the present invention does not do any qualification to this.In other embodiments, also can be set to when the state of the first control signal S1 is low level, power supply changeover device 51 enables, and main system 3 powers on.At this moment, the state of the second control signal S2 of control pin 31 outputs of main system 3 still can correspond to high level.Perhaps, the state of the second control signal S2 of control pin 31 outputs of main system 3 also can correspond to low level.
In the present embodiment, logic arithmetic element 52 has first input end 521, second input 522 and output 523.First input end 521 receives the first control signal S1, and second input 522 receives the second control signal S2 of the control pin 31 of autonomous system 3.Output 523 is exported the 3rd control signal S3 of corresponding states according to the state of the first control signal S1 and the second control signal S2.
Particularly, in the present embodiment, logic arithmetic element 52 can be one with the door.Because in the present embodiment, the first control signal S1 that control main system 3 powers on is a high level signal, after main system 3 powers on, the second control signal S2 is a high level signal, therefore, behind process logic arithmetic element 52, the 3rd control signal S3 of its output 523 outputs is high level signal.Yet the present invention does not do any qualification to this.In other embodiments, when the first control signal S1 still is a high level signal, when the second control signal S2 was low level signal, the 3rd control signal S3 corresponded to low level signal; When the first control signal S1 is a low level signal, when the second control signal S2 was high level signal, the 3rd control signal S3 also can be low level signal; When the first control signal S1 is a low level signal, when the second control signal S2 was low level signal, the 3rd control signal S3 also can be high level signal.In brief, when logic arithmetic element 52 be one with when door, the power on state of the second control signal S2 that the back exports of the state of the first control signal S1 that control main system 3 powers on and main system 3 can be combination in any.
In the present embodiment, when the state of the first control signal S1 becomes low level moment, because main system 3 outage as yet, promptly the second control signal S2 still remains high level, then behind process logic arithmetic element 52, the 3rd control signal S3 can become low level by original high level.In other embodiments, the 3rd control signal S3 also can become high level by original low level.
In addition, the present invention does not limit the type of logic arithmetic element 52 yet.For example, logic arithmetic element 52 also can be or door or NOR gate.At this moment, the state of the first control signal S1 that powers on of control main system 3 and main system 3 power on must have one to be low level in the state of the second control signal S2 that the back exports.Can guarantee that so the 3rd control signal S3 can change state accordingly behind the first control signal S1 change state.
In the present embodiment, switch element 53 can be metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor MOSFET), for example can be P type metal-oxide half field effect transistor (PMOS).The grid of switch element 53 is coupled to the output 523 of logic arithmetic element 52, and source electrode is coupled to power supply unit 2, and drain electrode is coupled to subsystem 4.Be applied to the state that magnitude of voltage on the grid has determined switch element 53.
Particularly, in the present embodiment, the 3rd control signal S3 corresponding voltage value that can set high potential provides the magnitude of voltage to subsystem 4 (promptly being applied to the magnitude of voltage of source electrode) less than power supply unit 2, and the 3rd control signal S3 corresponding voltage value of electronegative potential provides to the magnitude of voltage of subsystem 4 greater than power supply unit 2.So, in the present embodiment, after the first control signal S1 control main system 3 of high potential powers on, the second control signal S2 of main system 3 output high potentials, so the 3rd control signal S3 of logic arithmetic element 52 output high potentials.Thus, switch element 53 conductings, the passage between source electrode and the drain electrode forms, and power supply unit 2 can provide power supply to subsystem 4.
In the present embodiment, when the first control signal S1 became electronegative potential, the 3rd control signal S3 of logic arithmetic element 52 outputs also became electronegative potential immediately.Thus, switch element 53 is closed, and the passage between source electrode and the drain electrode disconnects, subsystem 4 outages.After main system 3 outages, its control pin 31 no-outputs.Switch element 53 promptly maintains closed condition, and thus, subsystem 4 also maintains off-position.Yet the present invention does not do any qualification to this.In other embodiments, the 3rd control signal S3 corresponding voltage value that also can set electronegative potential provides to the magnitude of voltage of subsystem 4 less than power supply unit 2, and the 3rd control signal S3 corresponding voltage value of high potential provides to the magnitude of voltage of subsystem 4 greater than power supply unit 2.As long as guarantee that also may command subsystem 4 powers on when first control signal S1 control main system 3 powers on; After 3 outages of first control signal S1 control main system, also 4 outages of may command subsystem get final product.In addition, the present invention does not also do any qualification to the type of switch element 53.In other embodiments, it also can be NMOS.
Fig. 2 is the flow chart according to the power control method of a preferred embodiment of the present invention.Please also refer to Fig. 1 and Fig. 2.In the present embodiment, in step S21, controlling power supply unit 2 according to the state of the first control signal S1 provides power supply to main system 3.Particularly, the power supply changeover device 51 of power control circuit 5 receives the first control signal S1.In the present embodiment, if when the state of the first control signal S1 is high level, power supply changeover device 51 enables, and the power supply that power supply unit 2 provides can provide to main system 3.Yet the present invention does not do any qualification to this.
In step S22, the second control signal S2 is to power control circuit 5 in main system 3 outputs.Particularly, main system 3 after receiving the power supply electrifying that power supply changeover device 51 provides, its control pin 31 outputs second control signal S2.In the present embodiment, the state of the second control signal S2 can be high level.Yet the present invention does not do any qualification to this.
In step S23, receive the first control signal S1 and the second control signal S2.In the present embodiment, the first input end 521 of logic arithmetic element 52 receives the first control signal S1, and second input 522 receives the second control signal S2.
In step S24, export the 3rd control signal S3.Particularly, in the present embodiment, logic arithmetic element 52 be one with door, behind the first control signal S2 of the first control signal S1 that receives high level and high level, pass through the 3rd control signal S3 of its output 523 exportable high level of computing.Yet the present invention does not do any qualification to this.
In step S25, controlling power supply unit 2 according to the state of the 3rd control signal S3 provides power supply to subsystem 4.Particularly, in the present embodiment, the 3rd control signal S3 corresponding voltage value of high potential provides to the magnitude of voltage of subsystem 4 less than power supply unit 2, and therefore, the 3rd control signal S3 of high potential can make switch element 53 conductings.The power supply that power supply unit 2 provides may be output to subsystem 4.After the first control signal S1 became low level by high level, on the one hand it made power supply changeover device 51 forbidden energy, main system 3 outages, and on the other hand through after the computing of logic arithmetic element 52, the state of the 3rd control signal S3 becomes electronegative potential by high potential.Because in the present embodiment, the 3rd control signal S3 corresponding voltage value of electronegative potential provides to the magnitude of voltage of subsystem 4 greater than power supply unit 2, and therefore, switch element 53 is closed, thereby makes subsystem 4 outages.
In sum, the power control circuit and the power control system of using it and the control method that provide according to the embodiment of the invention, second control signal of utilizing first control signal and main system mutually " with " back control switch element, make external system can turn-off the power supply of main system and subsystem fully by first control signal, do not influence simultaneously the control of main system antithetical phrase system power supply, thereby the resolution system electric leakage can't be turn-offed problem fully with system.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (17)
1. a power control circuit is coupled between power supply unit and the subsystem, it is characterized in that, above-mentioned power control circuit comprises:
Logic arithmetic element has first input end, second input and output, and above-mentioned first input end and above-mentioned second input receive first control signal and second control signal respectively, and above-mentioned output is exported the 3rd control signal; And
Switch element couples the above-mentioned output and the above-mentioned subsystem of above-mentioned power supply unit, above-mentioned logic arithmetic element, and above-mentioned switch element is controlled above-mentioned power supply unit according to the state of above-mentioned the 3rd control signal provides power supply to above-mentioned subsystem.
2. power control circuit according to claim 1, it is characterized in that, above-mentioned power control circuit also comprises power supply changeover device, couple above-mentioned power supply unit and main system, above-mentioned power supply changeover device has Enable Pin to receive above-mentioned first control signal, and above-mentioned power supply changeover device is controlled above-mentioned power supply unit according to the state of above-mentioned first control signal provides power supply to above-mentioned main system.
3. power control circuit according to claim 2 is characterized in that, when the state of above-mentioned first control signal was high level, above-mentioned power supply changeover device is controlled above-mentioned power supply unit provided power supply to above-mentioned main system.
4. power control circuit according to claim 1 is characterized in that above-mentioned logic arithmetic element is and door.
5. power control circuit according to claim 1 is characterized in that, above-mentioned switch element is a metal-oxide half field effect transistor.
6. power control circuit according to claim 5 is characterized in that, above-mentioned metal-oxide half field effect transistor is a P type metal-oxide half field effect transistor.
7. a power control system is characterized in that, comprising:
Power supply unit;
Subsystem; And
Power control circuit is coupled between above-mentioned power supply unit and the above-mentioned subsystem, and above-mentioned power control circuit comprises:
Logic arithmetic element has first input end, second input and output, and above-mentioned first input end and above-mentioned second input receive first control signal and second control signal respectively, and above-mentioned output is exported the 3rd control signal; And
Switch element couples the above-mentioned output and the above-mentioned subsystem of above-mentioned power supply unit, above-mentioned logic arithmetic element, and above-mentioned switch element is controlled above-mentioned power supply unit according to the state of above-mentioned the 3rd control signal provides power supply to above-mentioned subsystem.
8. power control system according to claim 7 is characterized in that above-mentioned power control system also comprises main system, and above-mentioned main system is exported above-mentioned second above-mentioned second input that controls signal to above-mentioned logic arithmetic element.
9. power control system according to claim 8, it is characterized in that, above-mentioned power control circuit also comprises power supply changeover device, couple above-mentioned power supply unit and above-mentioned main system, above-mentioned power supply changeover device has Enable Pin to receive above-mentioned first control signal, and above-mentioned power supply changeover device is controlled above-mentioned power supply unit according to the state of above-mentioned first control signal provides power supply to above-mentioned main system.
10. power control system according to claim 9 is characterized in that, when the state of above-mentioned first control signal was high level, above-mentioned power supply changeover device is controlled above-mentioned power supply unit provided power supply to above-mentioned main system.
11. the described power control system of claim 7 is characterized in that above-mentioned logic arithmetic element is and door.
12. the described power control system of claim 7 is characterized in that, above-mentioned switch element is a metal-oxide half field effect transistor.
13. the described power control system of claim 12 is characterized in that, above-mentioned metal-oxide half field effect transistor is a P type metal-oxide half field effect transistor.
14. a power control method is applied to power control circuit, it is characterized in that, above-mentioned power control method comprises:
Receive first control signal and second control signal;
Export the 3rd control signal; And
Controlling power supply unit according to the state of above-mentioned the 3rd control signal provides power supply to subsystem.
15. power control method according to claim 14 is characterized in that, above-mentioned power control method also comprises:
Controlling above-mentioned power supply unit according to the state of above-mentioned first control signal provides power supply to main system.
16. power control method according to claim 15 is characterized in that, above-mentioned main system is exported above-mentioned second and is controlled signal to above-mentioned power control circuit.
17. power control method according to claim 15 is characterized in that, when the state of above-mentioned first control signal was high level, controlling above-mentioned power supply unit provided power supply to above-mentioned main system.
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| CN2010101435820A CN102214990A (en) | 2010-04-09 | 2010-04-09 | Power control circuit, power control system applying same and control method |
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| CN2010101435820A CN102214990A (en) | 2010-04-09 | 2010-04-09 | Power control circuit, power control system applying same and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023028878A1 (en) * | 2021-08-31 | 2023-03-09 | 华为技术有限公司 | Signal processing circuit, emission system, laser radar, and terminal device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023028878A1 (en) * | 2021-08-31 | 2023-03-09 | 华为技术有限公司 | Signal processing circuit, emission system, laser radar, and terminal device |
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Application publication date: 20111012 |