CN201327619Y - Soft-off circuit and portable system - Google Patents
Soft-off circuit and portable system Download PDFInfo
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- CN201327619Y CN201327619Y CNU2008202133686U CN200820213368U CN201327619Y CN 201327619 Y CN201327619 Y CN 201327619Y CN U2008202133686 U CNU2008202133686 U CN U2008202133686U CN 200820213368 U CN200820213368 U CN 200820213368U CN 201327619 Y CN201327619 Y CN 201327619Y
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Abstract
The utility model provides a soft-off circuit and a portable system; the soft-off circuit comprises a power source unit with a power-off control signal input terminal and a power source control unit with a power-off control signal output terminal, wherein, the power-off control signal input terminal of the power source unit is connected with the power-off control signal output terminal of the power source control unit; the power source control unit is used for generating a power-off control signal to control the power-off of the power source unit; the soft-off circuit also comprises a return unit with a return signal output terminal and a signal separation unit; the return signal output terminal of the return unit is connected with the power-off control signal input terminal of the power source unit through the signal separation unit and is used for outputting a return signal to control the power-off of the power source unit. The soft-off circuit improves the soft-off reliability of the system.
Description
Technical field
The utility model relates to a kind of soft-off circuit and portable system.
Background technology
In the power shutdown circuit design of at present general portable system, in order to realize the shutdown under system's automatic timing shut-off, low electric weight shutdown and other special circumstances (as stolen), normally adopt software control GPIO (general-purpose I/O, general input) high-low level state, output close machine control signal realizes closing of power supply unit.Though aforesaid way is simple and convenient, yet the reliability of its shutdown is bad, the situation of can occur shutting down unsuccessful or the unexpected shutdown of system.
As shown in Figure 1, prior art mainly is that the GPIO by CPU controls closing of power supply unit, (it is to be accepted extraneous shutdown command and produced by keyboard unit that shut down event does not limit when keyboard unit sends shut down event to CPU, also can be that system's other modes of automatic generation or the like after arriving the appointment unused time produce), CPU sends to power supply unit by GPIO and closes machine control signal, power supply unit accepts to close machine control signal, powered-down.Its defective is in the software shutdown process, in the middle of power supply drops into during certain numerical value, CPU can't operate as normal, thereby also is in a nondeterministic statement by the shutdown GPIO of its control, at this moment system power supply may be triggered again and be opened, and causes the shutdown failure.
The utility model content
In view of this, the utility model provides a kind of soft-off circuit, can realize soft-off reliably.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of soft-off circuit, comprise the power supply unit that contains the signal input end of shutting down and contain the power control unit of the control signal output ends of shutting down, the shutdown signal input end of described power supply unit links to each other with the shutdown control signal output ends of described power control unit, described power control unit is used for generating pass machine control signal control power supply unit and closes, described soft-off circuit also comprises the reset unit that contains the reset signal output terminal, the Signal Spacing unit, the reset signal output terminal of described reset unit links to each other with the shutdown signal input end of power supply unit through the Signal Spacing unit, is used for closing to power supply unit output reset signal control power supply unit.
Described soft-off circuit, when described reset signal with to close the machine control signal significant level identical, described Signal Spacing unit is a diode: if reset signal is a low level, the negative pole of described reset signal output terminating diode, otherwise, connect the positive pole of diode, described shutdown control signal output ends correspondence is connected to another utmost point of diode, and another utmost point of this diode is connected to the shutdown signal input end of power supply unit; When described reset signal with to close the machine control signal significant level different, described Signal Spacing unit is diode and phase inverter: described reset signal output terminal by phase inverter, if the reset signal after anti-phase is a low level, connects the negative pole of diode earlier, otherwise, connect the positive pole of diode.
The invention also discloses a kind of portable system, comprise soft-off circuit, described soft-off circuit comprises the power supply unit that contains the signal input end of shutting down and contains the power control unit of the control signal output ends of shutting down, the shutdown signal input end of described power supply unit links to each other with the shutdown control signal output ends of described power control unit, described power control unit is used for generating pass machine control signal control power supply unit and closes, described soft-off circuit also comprises the reset unit that contains the reset signal output terminal, the Signal Spacing unit, the reset signal output terminal of described reset unit links to each other with the shutdown signal input end of power supply unit through the Signal Spacing unit, is used for closing to power supply unit output reset signal control power supply unit.
Described portable system, when described reset signal with to close the machine control signal significant level identical, described Signal Spacing unit is a diode: if reset signal is a low level, the negative pole of described reset signal output terminating diode, otherwise, connect the positive pole of diode, described shutdown control signal output ends correspondence is connected to another utmost point of diode, and another utmost point of this diode is connected to the shutdown signal input end of power supply unit; When described reset signal with to close the machine control signal significant level different, described Signal Spacing unit is diode and phase inverter: described reset signal output terminal by phase inverter, if the reset signal after anti-phase is a low level, connects the negative pole of diode earlier, otherwise, connect the positive pole of diode.
Described portable system, described power control unit are the CPU control chip.
Described portable system can be mobile phone, smart mobile phone, PDA or palm PC.
Soft-off circuit of the present utility model and portable system by increasing reset unit, utilize reset signal further to control closing of power supply unit, thereby have improved the reliability of soft-off.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of portable system of the prior art;
Fig. 2 is the system architecture synoptic diagram of the portable system of the utility model embodiment.
Fig. 3 is the system architecture synoptic diagram that increases the portable system of Signal Spacing unit in the utility model embodiment.
Embodiment
Contrast accompanying drawing and the utility model is further elaborated below in conjunction with embodiment.
Referring to Fig. 2, Fig. 2 has showed the system architecture of the portable system of the utility model embodiment, portable system can be mobile phone, smart mobile phone, PDA (personal digital assistant equipment), palm PC an or the like mobile terminal system, includes CPU, power supply unit, reset unit, keyboard unit.Should understand, the portable system structure of showing among the figure only is the displaying to associated components of the present utility model, and be not comprise portable system whole, portable system also can comprise miscellaneous part, for example realizes the communication unit of communication function, multimedia processing unit that the realization media information is play or the like.
Wherein, keyboard unit can respond extraneous power-off operation, thereby sends shut down event to CPU.CPU is as power control unit, can generate the pass machine control signal, is used for controlling closing of power supply unit.CPU can be the chip or the circuit of various operational system softwares, for example single-chip microcomputer, FPGA, DSP or the like.With the single-chip microcomputer is example, and it has several GPIO usually, can choose one of them GPIO as the shutdown control signal output ends, and in this example, pass machine control signal low level is effective.Power supply unit has the shutdown signal input end, links to each other with the shutdown control signal output ends of CPU, accepts to close machine control signal, and powered-down is realized soft-off.
As previously mentioned, above-mentioned soft-off control mode is also unreliable, in order to improve the reliability of soft-off, the utility model has been introduced reset unit, reset unit can generate reset signal, output to the shutdown signal input end of power supply unit by the reset signal output terminal of reset unit, the control power-off.
As shown in Figure 3, because the pass machine control signal of CPU and the reset signal of reset unit work together to the shutdown signal input end of power supply unit, in order to prevent that two signals from interacting, close machine control signal and reset signal by the Signal Spacing cell isolation, concrete mode is as follows:
When reset signal and pass machine control signal all were low level, the Signal Spacing unit was a diode, and the positive pole of diode is connected to the shutdown signal input end of power supply unit; Reset signal connects the negative pole of diode; The pass machine control signal connects the positive pole of diode.
When reset signal and pass machine control signal all were high level, the Signal Spacing unit was a diode, and the negative pole of diode is connected to the shutdown signal input end of power supply unit; Reset signal connects the positive pole of diode, closes the negative pole that machine control signal connects diode.
Reset signal is low, and when the pass machine control signal was high level, the Signal Spacing unit was diode and phase inverter, and the negative pole of diode is connected to the shutdown signal input end of power supply unit; Reset signal is earlier anti-phase by phase inverter, and the positive pole that the reset signal after anti-phase connects diode closes the negative pole that machine control signal connects diode.
Reset signal is high, and when the pass machine control signal was low level, the Signal Spacing unit was diode and phase inverter, and the positive pole of diode is connected to the shutdown signal input end of power supply unit; Reset signal is earlier anti-phase by phase inverter, and the negative pole that the reset signal after anti-phase connects diode closes the positive pole that machine control signal connects diode.
The soft-off control procedure of system is as follows: when shutdown control GPIO is significant level, the power supply output of power supply unit begins to fall, when it drops into reset level (before this, CPU is can steady operation) time, the system software of CPU is out of service, so the shutdown of CPU control GPIO has been a nondeterministic statement, thereby power supply unit also is in nondeterministic statement, cause system to have necessarily and may re-power start, cause the shutdown failure.And with after the systematic reset signal introducing, when system power supply drops into reset level, though shutdown control GPIO lost efficacy, but because reset unit is under this level, can export an effective reset level signal always and give power supply unit, thereby can guarantee that system is closed completely, improve the reliability of soft-off.
More than be of the description of combined type portable system to soft-off circuit and working method thereof, obviously, can be transplanted to equally in the other system by the soft-off circuit that power control unit, power supply unit and reset unit are formed, its structure and working method are roughly the same above-mentioned, do not repeat them here.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (6)
1. soft-off circuit, comprise the power supply unit that contains the signal input end of shutting down and contain the power control unit of the control signal output ends of shutting down, the shutdown signal input end of described power supply unit links to each other with the shutdown control signal output ends of described power control unit, described power control unit is used for generating pass machine control signal control power supply unit and closes, it is characterized in that, described soft-off circuit also comprises the reset unit that contains the reset signal output terminal, the Signal Spacing unit, the reset signal output terminal of described reset unit links to each other with the shutdown signal input end of power supply unit through the Signal Spacing unit, is used for closing to power supply unit output reset signal control power supply unit.
2. soft-off circuit as claimed in claim 1, it is characterized in that, when described reset signal with to close the machine control signal significant level identical, described Signal Spacing unit is a diode: if reset signal is a low level, the negative pole of described reset signal output terminating diode, otherwise, the positive pole of diode connect, described shutdown control signal output ends correspondence is connected to another utmost point of diode, and another utmost point of this diode is connected to the shutdown signal input end of power supply unit; When described reset signal with to close the machine control signal significant level different, described Signal Spacing unit is diode and phase inverter: described reset signal output terminal by phase inverter, if the reset signal after anti-phase is a low level, connects the negative pole of diode earlier, otherwise, connect the positive pole of diode.
3. portable system, comprise soft-off circuit, described soft-off circuit comprises the power supply unit that contains the signal input end of shutting down and contains the power control unit of the control signal output ends of shutting down, the shutdown signal input end of described power supply unit links to each other with the shutdown control signal output ends of described power control unit, described power control unit is used for generating pass machine control signal control power supply unit and closes, it is characterized in that, described soft-off circuit also comprises the reset unit that contains the reset signal output terminal, the Signal Spacing unit, the reset signal output terminal of described reset unit links to each other with the shutdown signal input end of power supply unit through the Signal Spacing unit, is used for closing to power supply unit output reset signal control power supply unit.
4. portable system as claimed in claim 3, it is characterized in that, when described reset signal with to close the machine control signal significant level identical, described Signal Spacing unit is a diode: if reset signal is a low level, the negative pole of described reset signal output terminating diode, otherwise, the positive pole of diode connect, described shutdown control signal output ends correspondence is connected to another utmost point of diode, and another utmost point of this diode is connected to the shutdown signal input end of power supply unit; When described reset signal with to close the machine control signal significant level different, described Signal Spacing unit is diode and phase inverter: described reset signal output terminal passes through phase inverter earlier, if the reset signal after anti-phase is a low level, connects the negative pole of diode, otherwise connect the positive pole of diode.
5. portable system as claimed in claim 3 is characterized in that, described power control unit is the CPU control chip.
6. as each described portable system of claim 3 to 5, it is characterized in that described portable system is mobile phone, smart mobile phone, PDA or palm PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202133686U CN201327619Y (en) | 2008-11-11 | 2008-11-11 | Soft-off circuit and portable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202133686U CN201327619Y (en) | 2008-11-11 | 2008-11-11 | Soft-off circuit and portable system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201327619Y true CN201327619Y (en) | 2009-10-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202133686U Expired - Lifetime CN201327619Y (en) | 2008-11-11 | 2008-11-11 | Soft-off circuit and portable system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201327619Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999137A (en) * | 2011-09-08 | 2013-03-27 | 昆达电脑科技(昆山)有限公司 | Lowe-electric-quantity shutdown method |
-
2008
- 2008-11-11 CN CNU2008202133686U patent/CN201327619Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999137A (en) * | 2011-09-08 | 2013-03-27 | 昆达电脑科技(昆山)有限公司 | Lowe-electric-quantity shutdown method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091014 |