CN105227163A - Reset circuit and remote controller - Google Patents
Reset circuit and remote controller Download PDFInfo
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- CN105227163A CN105227163A CN201510543001.5A CN201510543001A CN105227163A CN 105227163 A CN105227163 A CN 105227163A CN 201510543001 A CN201510543001 A CN 201510543001A CN 105227163 A CN105227163 A CN 105227163A
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- switching tube
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- switch pipe
- power supply
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Abstract
The invention provides a kind of reset circuit and remote controller, wherein, when reset button in reset circuit is pressed, not only can control the feeder ear of parting system and the connection of power supply, and provide the discharge loop on ground for the feeder ear of system, the spurious charge of system power supply end is discharged quickly through discharge loop, filter capacitor in system and the electric charge in parasitic capacitance also can be discharged rapidly by discharge loop, thus make system realize resetting completely, guarantee that system can reliably power on, decrease the resetting time of system.
Description
Technical field
The invention belongs to electronic technology field, especially relate to a kind of reset circuit and remote controller.
Background technology
Reset circuit, returns to circuit the circuit of initial state exactly.In the electric equipment products such as television set, Set Top Box, remote controller, when system works is abnormal, usually utilizes reset circuit that main control chip in system is resetted, and restart, thus make system restart.
Fig. 1 is low-level reset circuit figure conventional at present.As shown in Figure 1, reset circuit is primarily of resistance and electric capacity composition, S is reset button, Rst is connected with the reset pin of chip, in chip operation process, VCC is added in chip reset pin place through resistance R, chip reset pin is made to be high level, ensure that chip is not reset, when pressing reset button, electric capacity C is discharged by reset button, on electric capacity, voltage reduces gradually, when electric capacity both end voltage reduces to zero, the level be added on chip reset pin is low level, make chip reset, after unclamping reset button, voltage VCC passes through again resistance R to capacitor charging, the level being added in chip reset pin is made to become high level, chip is started working again.
Usually, utilize above-mentioned RC reset circuit only system chips can be resetted, when whole system is abnormal, during as crashed, need after system cut-off, restart, but, owing to there is more filter capacitor and parasitic capacitance in system, when system cut-off is restarted, filter capacitor in system and the voltage in parasitic capacitance will discharge completely, just can re-power startup, otherwise the phenomenons such as easy generation systems can not reliably power on, reset, and the voltage in system on electric capacity discharges the needs longer time completely, therefore, the reseting procedure time of system is longer.
Summary of the invention
The invention provides a kind of reset circuit and remote controller, for solving in prior art, the long problem of system reset process time.
One aspect of the present invention provides a kind of reset circuit, comprising: reset button, the first switching tube, second switch pipe, the first resistance and the second resistance, and wherein, the first switching tube is negative voltage conduction device, and second switch pipe is positive voltage conduction device;
One end of described reset button is connected with the source electrode of the first switching tube and power supply input, and the grid of its other end and one end of the first resistance, the grid of the first switching tube and second switch pipe is connected;
The other end of the first resistance is connected with the source electrode of second switch pipe and ground;
One end of second resistance is connected with the drain electrode of second switch pipe;
The drain electrode of the first switching tube, the other end of the second resistance are connected with system power supply end, are used for as system provides supply power voltage.
The present invention provides a kind of remote controller on the other hand, comprising: reset circuit as above and main circuit;
The drain electrode of the first switching tube of described reset circuit, the other end of the second resistance are connected with the feeder ear of described main circuit.
Reset circuit provided by the invention and remote controller, when reset button is pressed, the negative voltage be carried between the first switching tube grid and source electrode is shorted, thus the first switching tube is disconnected, and then be disconnected the feeder ear of system and the connection of power supply, simultaneously, positive voltage is loaded between second switch tube grid and source electrode, thus make the conducting of second switch pipe, feeder ear for system provides the discharge loop on ground, the spurious charge of system power supply end is discharged quickly through discharge loop, filter capacitor in system and the electric charge in parasitic capacitance also can be discharged rapidly by discharge loop, thus make system realize resetting completely, guarantee that system can reliably power on, decrease the resetting time of system.
Accompanying drawing explanation
Fig. 1 is low-level reset circuit figure conventional at present;
The structural representation of a kind of reset circuit that Fig. 2 provides for the embodiment of the present invention one;
The structural representation of the another kind of reset circuit that Fig. 3 provides for the embodiment of the present invention two;
The structural representation of another reset circuit that Fig. 4 provides for the embodiment of the present invention three;
The structural representation of a kind of remote controller that Fig. 5 provides for the embodiment of the present invention four.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
The present invention is directed to when making system reset by power-off in prior art, the problem that resetting time is long, proposes a kind of reset circuit, utilizes this reset circuit when system reset, the spurious charge of system can be discharged rapidly, thus decrease the resetting time of system.
The reset circuit that various embodiments of the present invention provide, goes in the system of all needs resets, such as TV, Set Top Box or remote controller etc.For convenience of description, unification of the present invention is described for remote manipulator system.
The structural representation of a kind of reset circuit that Fig. 2 provides for the embodiment of the present invention one.As shown in Figure 2, this reset circuit, comprising: reset button S1, the first switching tube V1, second switch pipe V2, the first resistance R1 and the second resistance R2.
Wherein, the first switching tube V1 is negative voltage conduction device, and second switch pipe V2 is positive voltage conduction device;
One end of described reset button S1 is connected with the source electrode of the first switching tube V1 and power supply Vin input, and the grid of its other end and one end of the first resistance R1, the grid of the first switching tube V1 and second switch pipe V2 is connected;
The other end of the first resistance R1 is connected with the source electrode of second switch pipe V2 and ground GND;
One end of second resistance R2 is connected with the drain electrode of second switch pipe V2;
The drain electrode of the first switching tube V1, the other end of the second resistance R2 are connected with system power supply end Vdd, are used for as system provides supply power voltage.
Wherein, the first switching tube can be P type MOSFET, and second switch pipe can be N-type MOSFET.
In the present embodiment, utilize the break-make of the first switch controlled system power supply, when the first switching tube conducting, the voltage that power supply inputs is exported to system, for system provides supply power voltage, when first switching tube turns off, the feeder ear of system and power supply input are disconnected, makes system power supply voltage be zero; Second switch is effective next when system reset, for the electric charge existed in system provides discharge path, thus make voltage in system will be rapidly zero, wherein, first resistance is in circuit for the conducting of the first switching tube and second switch pipe provides gate bias voltage and drive current, and the second resistance is as the conducting current-limiting resistance of second switch pipe, the On current of second switch pipe can be limited, thus prevent second switch pipe damaged.
Concrete, during system worked well, reset button is in off-state, suppose that power supply voltage is V, then now the grid of the first switching tube and source voltage are-V, because the first switching tube is negative pressure conduction device, now the first switching tube is in conducting state under the control of-V, and the conducting resistance of switching tube and conduction voltage drop less, namely the conduction loss of the first switching tube is very low, the voltage Vdd exported by the first switching tube drain electrode and the magnitude of voltage of power supply voltage V are closely, and now the grid of second switch pipe and voltage between source electrodes are 0, second switch pipe is made to be in off-state, now whole system is in normal power supply state.
When pressing reset button and resetting, the grid of the first switching tube and voltage between source electrodes is made to be 0, thus the first switching tube is turned off, closely the feeder ear of whole system and power supply input are disconnected, thus the power supply be disconnected system, and the system that avoids brings infringement to powersupply system in discharge process; Simultaneously, voltage is added in the grid of second switch pipe by power supply input by reset button, the grid of second switch pipe and voltage between source electrodes is made to be V, thus make the conducting of second switch pipe, and then the feeder ear of system is communicated with ground, system power supply end is directly discharged over the ground, the electric charge of system power supply end is discharged rapidly, now not only make power supply enter off-state, and the discharge loop that the filter capacitor in system and the electric charge in parasitic capacitance also can be provided by second switch pipe discharge rapidly.
When unclamping reset button, power supply is system power supply by the first switch again, and system restarts work.
The reset circuit that the present embodiment provides, when reset button is pressed, the negative voltage be carried between the first switching tube grid and source electrode is shorted, thus the first switching tube is disconnected, and then be disconnected the feeder ear of system and the connection of power supply, simultaneously, positive voltage is loaded between second switch tube grid and source electrode, thus make the conducting of second switch pipe, feeder ear for system provides the discharge loop on ground, the spurious charge of system power supply end is discharged quickly through discharge loop, filter capacitor in system and the electric charge in parasitic capacitance also can be discharged rapidly by discharge loop, thus make system realize resetting completely, guarantee that system can reliably power on, decrease the resetting time of system.
In addition, for preventing in reseting procedure, the voltage jump of system, can also in above-mentioned reset circuit on the impact of power supply side, and access filter unit carries out filtering to the pulse voltage that voltage jump during system reset produces.Below in conjunction with Fig. 3, reset circuit provided by the invention is further detailed.The another kind of reset circuit structural representation that Fig. 3 provides for the embodiment of the present invention two.As shown in Figure 3, this reset circuit also comprises: filter unit 1.
Wherein, one end of described filter unit 1 is connected with power supply Vin input, and the described other end of filter unit 1 is connected with the source electrode of one end of reset button S1 and the first switching tube V1.
Concrete, filter unit can be made up of inductance, also can be made up of inductance and electric capacity, can also be made up of inductance, electric capacity and resistance.Shown in Fig. 3 is a kind of possible way of realization of filter unit, and as shown in Figure 3, described filter unit 1, comprising: the first inductance L 1 and the first electric capacity C1 be connected in parallel.
Be understandable that, in filter unit, the number of inductance and electric capacity can be selected as required, and be such as respectively one or an inductance and two Capacitance parallel connections or two inductance of connecting and an electric capacity etc., the present embodiment is not construed as limiting this.
In the present embodiment, utilize and can not to be suddenlyd change by the electric current of inductance and characteristic that the voltage at electric capacity two ends can not suddenly change, when working to reset button, pulse voltage and the electric current of generation absorb, thus effectively protect powersupply system.
Further, in order to realize the reliable control to the first switching tube and second switch pipe, the gate isolation of the grid of the first switching tube and second switch pipe can also be opened, concrete, as shown in Figure 3, this reset circuit, also comprises: the 3rd resistance R3.
Wherein, one end of described 3rd resistance R3 is connected with the grid of described first switching tube V1 and one end of the first resistance R1, and the other end of described 3rd resistance R3 is connected with the grid of described second switch pipe V2.
In the present embodiment, resistance is utilized to be isolated by the grid of the grid of the first switching tube and second switch pipe, and because the first switching tube and second switch pipe are voltage control device, while making to utilize the 3rd resistance to carry out isolating, also extra loss can not be brought.
In above-described embodiment, the voltage of power supply input directly exports to system power supply end after the first switching tube, in a kind of possible use scenes, the voltage that the operating voltage of system chips and power supply input is also unequal, now, can the form shown in Fig. 4 be passed through, utilize voltage conversion chip, be after the operating voltage of system chips by the voltage transitions that power supply inputs, then export to the feeder ear of system.Another reset circuit structural representation that Fig. 4 provides for the embodiment of the present invention three.As shown in Figure 4, this reset circuit, also comprises: voltage conversion chip U.
Wherein, the input of described voltage conversion chip U is connected with the drain electrode of described first switching tube V1, and the output of described voltage conversion chip U is connected with one end of described second resistance R2.
Concrete, voltage conversion chip, when selecting, can be determined according to the operating voltage of chip each in system.For example, if the operating voltage of system chips is identical, then can select single voltage conversion chip exported, by the operating voltage that the voltage transitions that power supply inputs is system main circuit needs, if the operating voltage of system chips is different, then can select the voltage conversion chip of a single-input double-output, or select two voltage conversion chip exporting different voltage respectively, now, in order to when resetting, electric charges all in system all can be released, need to connect a discharge loop at the output of each voltage conversion chip, output by each voltage conversion chip is connected to ground by the switching tube of positive voltage conducting, make, when resetting, the output of each voltage conversion chip, namely all feeder ears of system can directly discharge over the ground.
In addition, the input and output side of voltage conversion chip not altogether time, voltage conversion chip can also realize the isolation of power supply side and system power supply side, thus makes system more reliable.
Be understandable that, in order to make voltage conversion chip steady operation, can as shown in Figure 4, by serial capacitance between the input of voltage conversion chip and ground and between output and ground, make input voltage and the output voltage stabilization of voltage conversion chip.Namely as shown in Figure 4, this reset circuit, also comprises: the second electric capacity C2, the 3rd electric capacity C3 and the second inductance L 2.
Concrete, the two ends of the second electric capacity are connected with ground with the drain electrode of described first switching tube respectively;
The two ends of the 3rd electric capacity are connected with ground with the output of described voltage conversion chip respectively;
One end of second inductance is connected with the output of voltage conversion chip, and the other end of the second inductance is connected with one end of the second resistance.
Wherein, the number of electric capacity and inductance in place in circuit, can adjust as required, and such as at voltage conversion chip input multiple filter capacitor in parallel, at voltage conversion chip output also multiple electric capacity in parallel etc., the present embodiment is not construed as limiting this.In addition, the second inductance in circuit effectively can prevent second switch pipe conducting moment, and voltage conversion chip output produces mutation current and damages voltage conversion chip.
The reset circuit that the present embodiment provides, when reset button is pressed, the negative voltage be carried between the first switching tube grid and source electrode is shorted, thus the first switching tube is disconnected, and then be disconnected the feeder ear of system and the connection of power supply, simultaneously, positive voltage is loaded between second switch tube grid and source electrode, thus make the conducting of second switch pipe, feeder ear for system provides the discharge loop on ground, the spurious charge of system power supply end is discharged quickly through discharge loop, filter capacitor in system and the electric charge in parasitic capacitance also can be discharged rapidly by discharge loop, thus make system realize resetting completely, guarantee that system can reliably power on, decrease the time of system restart.Further, this reset circuit can also with voltage conversion chip with the use of, while providing suitable supply power voltage for system, ensure system active homing.
Based on the reset circuit that above-described embodiment provides, the structural representation of a kind of remote controller that Fig. 5 provides for the embodiment of the present invention four.As shown in Figure 5, this remote controller, comprising: reset circuit 51 and main circuit 52.
Wherein, the drain electrode of the first switching tube V1 in described reset circuit 51, the other end of the second resistance R2 are connected with the feeder ear of described main circuit 52.
Concrete, the reset circuit that the reset circuit in the present embodiment provides for above-mentioned any embodiment, the concrete structure of reset circuit and operation principle can refer to the detailed description of above-mentioned any embodiment, repeat no more herein.
Reset circuit in the remote controller that the present embodiment provides, when reset button is pressed, the negative voltage be carried between the first switching tube grid and source electrode is shorted, thus the first switching tube is disconnected, and then be disconnected the feeder ear of main circuit and the connection of power supply, simultaneously, positive voltage is loaded between second switch tube grid and source electrode, thus make the conducting of second switch pipe, feeder ear for main circuit provides the discharge loop on ground, the spurious charge of remote manipulator system feeder ear is discharged quickly through discharge loop, filter capacitor in remote manipulator system and the electric charge in parasitic capacitance also can be discharged rapidly by discharge loop, thus make remote manipulator system realize resetting completely, guarantee that remote manipulator system can reliably power on, decrease the resetting time of remote manipulator system.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a reset circuit, is characterized in that, comprising: reset button, the first switching tube, second switch pipe, the first resistance and the second resistance, and wherein, the first switching tube is negative voltage conduction device, and second switch pipe is positive voltage conduction device;
One end of described reset button is connected with the source electrode of the first switching tube and power supply input, and the grid of its other end and one end of the first resistance, the grid of the first switching tube and second switch pipe is connected;
The source electrode of second switch pipe is connected with ground;
One end of second resistance is connected with the drain electrode of second switch pipe;
The drain electrode of the first switching tube, the other end of the second resistance are connected with system power supply end, are used for as system provides supply power voltage.
2. circuit according to claim 1, is characterized in that, also comprises: filter unit;
One end of described filter unit is connected with power supply input, and the other end of described filter unit is connected with the source electrode of one end of reset button and the first switching tube.
3. circuit according to claim 2, is characterized in that, described filter unit, comprising: the first inductance be connected in parallel and the first electric capacity.
4., according to the arbitrary described circuit of claim 1-3, it is characterized in that, also comprise: the 3rd resistance;
One end of described 3rd resistance is connected with the grid of described first switching tube and one end of the first resistance, and the other end of described 3rd resistance is connected with the grid of described second switch pipe.
5. circuit according to claim 4, is characterized in that, also comprises: voltage conversion chip;
The input of described voltage conversion chip is connected with the drain electrode of described first switching tube, and the output of described voltage conversion chip is connected with one end of described second resistance.
6. circuit according to claim 5, is characterized in that, also comprises: the second electric capacity, the 3rd electric capacity and the second inductance;
The two ends of the second electric capacity are connected with ground with the drain electrode of described first switching tube respectively;
The two ends of the 3rd electric capacity are connected with ground with the output of described voltage conversion chip respectively;
One end of second inductance is connected with the output of voltage conversion chip, and the other end of the second inductance is connected with one end of the second resistance.
7. circuit according to claim 6, is characterized in that, described first switching tube is P type MOSFET, and described second switch pipe is N-type MOSFET.
8. a remote controller, is characterized in that, comprising: the reset circuit as described in as arbitrary in claim 1-7 and main circuit;
The drain electrode of the first switching tube of described reset circuit, the other end of the second resistance are connected with the feeder ear of described main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510543001.5A CN105227163A (en) | 2015-08-28 | 2015-08-28 | Reset circuit and remote controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510543001.5A CN105227163A (en) | 2015-08-28 | 2015-08-28 | Reset circuit and remote controller |
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|---|---|
| CN105227163A true CN105227163A (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510543001.5A Pending CN105227163A (en) | 2015-08-28 | 2015-08-28 | Reset circuit and remote controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317297A (en) * | 2017-06-09 | 2017-11-03 | 青岛海信电器股份有限公司 | The self-resetting method and terminal device of equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202353536U (en) * | 2011-11-29 | 2012-07-25 | 福建三元达软件有限公司 | Time adjustable switching circuit |
| CN204216866U (en) * | 2014-12-02 | 2015-03-18 | 青岛海信信芯科技有限公司 | A kind of reset circuit and electronic equipment |
-
2015
- 2015-08-28 CN CN201510543001.5A patent/CN105227163A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202353536U (en) * | 2011-11-29 | 2012-07-25 | 福建三元达软件有限公司 | Time adjustable switching circuit |
| CN204216866U (en) * | 2014-12-02 | 2015-03-18 | 青岛海信信芯科技有限公司 | A kind of reset circuit and electronic equipment |
Non-Patent Citations (2)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317297A (en) * | 2017-06-09 | 2017-11-03 | 青岛海信电器股份有限公司 | The self-resetting method and terminal device of equipment |
| CN107317297B (en) * | 2017-06-09 | 2020-03-13 | 青岛海信电器股份有限公司 | Self-resetting method of equipment and terminal equipment |
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Application publication date: 20160106 |
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