CN201039316Y - A reset circuit and TV set with above reset circuit - Google Patents
A reset circuit and TV set with above reset circuit Download PDFInfo
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- CN201039316Y CN201039316Y CNU2007200202969U CN200720020296U CN201039316Y CN 201039316 Y CN201039316 Y CN 201039316Y CN U2007200202969 U CNU2007200202969 U CN U2007200202969U CN 200720020296 U CN200720020296 U CN 200720020296U CN 201039316 Y CN201039316 Y CN 201039316Y
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Abstract
The utility model discloses a reset circuit and a television with the reset circuit, comprising a power source terminal, a reset signal output terminal and an energy storage capacitor, wherein, the power source terminal outputs DC voltage when an electric appliance is electrified; the anode of the energy storage capacitor is connected with the power source terminal; the cathode of the energy storage capacitor, on the one hand, is connected with the reset signal output terminal and on the other hand grounded through a resistance; and a switch diode is connected between the energy storage capacitance and the ground. The reset circuit of the utility model adopts a charge and discharge circuit consisting of the capacitor, the resistance and the diode to produce the resetting signal, and further realize resetting operation of the functional chips; moreover, the reset circuit of the utility model has the advantages of simple collocation of the circuit without setting the parameters of the components in particular, low cost, easy realization and low power consumption.
Description
Technical field
The utility model relates to a kind of improvement of reset circuit, specifically, relates to a kind ofly guarantee that functional chip can accurately carry out the reset circuit design of reset operation when the fast powering-up power down.
Background technology
Rise along with panel TV, stage that can only TV reception before television function has surmounted far away, meanwhile, functional chip on the TV SKD is increasingly sophisticated various, the problem of chip reset is also more and more outstanding, need handle the stable operation of the system that could guarantee to resetting especially.
As everyone knows, functional chip needs advanced horizontal reset operation before operation, to guarantee its internal processes reliability of operation.Though the reliable reset when present reset circuit can both be accomplished chip power when fluctuation appears in supply power voltage, triggers functional chip through regular meeting and repeats to reset, and causes the functional chip cisco unity malfunction, has had a strong impact on the stability of complete machine operation.Moreover, traditional reset circuit is when the continuous switching on and shutting down of television set, because the charge and discharge process of storage capacitor can not be finished rapidly in the reset circuit, therefore, can't guarantee to export the resetting voltage of accurate sequential, thereby cause the unusual of television set work easily, to the certain influence of complete machine quality generation of television set.
The utility model content
The purpose of this utility model is to provide a kind of novel reset circuit, to solve the insecure problem of conventional reset circuit working.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of reset circuit and have the television set of described reset circuit, comprise electric equipment power on the back output dc voltage power end, reset signal output and a storage capacitor, the positive pole of described storage capacitor connects described power end, negative pole connects described reset signal output, resistance grounded on the other hand on the one hand.
Described storage capacitor is an electrochemical capacitor, for when the electric equipment power down, bleed off falls to be stored in the electric charge in the described electrochemical capacitor in time, carry out reset operation when powering on once more for next time, the negative pole of described electrochemical capacitor connects the negative electrode of a switching diode, the plus earth of described switching diode.
Because different functional chips has different requirements to the high-low level state of reset signal, therefore, in reset circuit of the present utility model, can adopt two kinds of connected modes between the reset pin of its reset signal output and functional chip: in the time need carrying out the electrification reset operation, direct being connected with the resetting pin of functional chip of described reset signal output got final product to the functional chip that high level resets; And in the time need carrying out the electrification reset operation to the functional chip that low level resets, can on described reset signal output, connect a negative circuit, after by described negative circuit the reset signal current potential of reset signal output output being carried out anti-phase processing, export to the resetting pin of described functional chip, control its accurate electrification reset.
In order to simplify the structure of negative circuit, the utility model adopts a NPN type triode to cooperate simple peripheral circuit to form described negative circuit.Wherein, the base stage of described triode connects the reset signal output, and collector electrode connects described dc power supply terminal on the one hand, connects the described resetting pin that needs the functional chip that low level resets on the other hand, grounded emitter.
Certainly, described negative circuit can also adopt other gate-controlled switch devices such as metal-oxide-semiconductor, controllable silicon, relay to realize.
Compared with prior art, advantage of the present utility model and good effect are: the charge-discharge circuit that reset circuit of the present utility model adopts electric capacity, resistance and diode to form produces reset signal, and then realization is to the reset operation of functional chip, its configuration circuit is fairly simple, cost is lower, need not to be provided with especially component parameter, realize that power consumption is less easily.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Fig. 1 is the schematic diagram of reset circuit in the utility model.
Embodiment
The charge-discharge circuit that reset circuit of the present utility model adopts electrochemical capacitor, resistance and diode to form is realized, produces the reset pin that comparatively desirable reset signal offers each functional chip, controls its accurate electrification reset.
Embodiment one, referring to shown in Figure 1, DV33SB is the power end of output dc voltage after electric equipment powers among the figure, by television set, described DV33SB is wherein one road dc voltage output end of power circuit on the TV set circuit plate, the concrete needs of the functional chip that will connect according to reset circuit can be direct current+3.3V voltage output ends, can also be direct current+5V voltage output ends.The utility model is that example is specifically addressed with the 3.3V output voltage.RESET is the reset signal output of described reset circuit.Include a storage capacitor CE48 in described reset circuit, can adopt an appearance value is the electrochemical capacitor realization of 10 μ F.Positive pole connection+3.3V dc power supply terminal the DV33SB of described electrochemical capacitor CE48, negative pole connects described reset signal output RESET on the other hand on the one hand through resistance R 90 ground connection.Described electrochemical capacitor CE48 and resistance R 90 are formed the electric capacity charge circuit, when the electric equipment start powers on, dc power supply terminal DV33SB output+3.3V direct voltage, at this moment, voltage on the capacitor C E48 is 0, constitutes charge circuit through resistance R 90 it is charged.Because the time constant RC of charging is bigger, needs the regular hour, so, when just powering on, by reset signal output RESET output high level signal, can directly connect the reset pin that needs the functional chip that high level resets, for it provides the high level power-on reset signal.After electrochemical capacitor CE48 was full of electricity gradually, the voltage on it approached+3.3V, and at this moment, reset signal output RESET is electronegative potential, and the functional chip end that resets enters the program normal operating phase.Thus, reset circuit of the present utility model can be decontroled resetting of chip again after power supply is stable, thereby has guaranteed system's reliability of operation that powers on.
When satisfying electric equipment high-speed switch machine, reset circuit still can accurately provide the requirement of reset signal, negative pole at described electrochemical capacitor CE48 is connected with a switching diode D5, the negative electrode of described switching diode D5 connects the negative pole of described electrochemical capacitor CE48, plus earth is formed the power down discharge loop with electrochemical capacitor CE48.When electric equipment shutdown power down, the voltage of dc power supply terminal DV33SB reduces rapidly, and the voltage on the electrochemical capacitor CE48 can not suddenly change, at this moment, electrochemical capacitor CE48 is by power end DV33SB, and switching diode D5 discharges, because the RC time constant of discharge loop is very little, make the voltage on the electrochemical capacitor CE48 be reduced to 0 rapidly, carry out same reset operation when powering on once more reliably for next time.
Embodiment two, for the effective functional chip of some reset signal low level, depend merely on the reset circuit that embodiment one set forth and to satisfy its requirement that resets normally, need increase negative circuit at the reset signal output RESET of above-mentioned reset circuit, carry out anti-phase to signal by above-mentioned reset signal output RESET output, to satisfy the requirement that resets of described functional chip, its circuit structure is referring to shown in Figure 1.
Among Fig. 1, the utility model adopts a NPN type triode Q5 to cooperate simple peripheral circuit to form negative circuit, wherein, the base stage of triode Q5 connects reset signal output RESET through series resistance R88, grounded emitter, collector electrode connects described dc power supply terminal DV33SB by resistance R 85 on the one hand, connects the resetting pin of described functional chip on the other hand.Like this, resistance R 85, R88 and triode Q5 form switching circuit; Diode D5, resistance R 90 and electrochemical capacitor CE48 form the impulse electricity circuit, carry out the impulse electricity action in power supply electrifying and power down, and with conducting and the cut-off state of control triode Q5, and then realization is to the control of ORESET# end output potential height.
When power supply electrifying, the voltage on the electrochemical capacitor CE48 is 0V, forms charge circuit through resistance R 90 it is charged.Because the time constant of charging is bigger, needs the regular hour, so power supply forms the loop over the ground by resistance R 88 and triode Q5 when just powering on, triode Q5 conducting, ORESET# holds output low level, controlled function chip hold reset state.After electric equipment is started shooting a period of time, voltage on the electrochemical capacitor CE48 is near 3.3V, at this moment, voltage on the reset signal output RESET is 0V, triode Q5 is ended, 3.3V DC power supply is by the resetting pin output high level signal of resistance R 85 to functional chip, the controlled function chip finishes reset operation, and program is normally moved.Based on this, reset circuit of the present utility model can just be decontroled when power supply is stable and reset, and makes running more secure, reliable of system.
Certainly, described negative circuit can also adopt other controllable switch element such as metal-oxide-semiconductor, controllable silicon, relay to realize that because its connected mode is that those of ordinary skills are easy to associate, therefore, the utility model is not described in detail in this.
When power supply power-fail, the voltage of dc power supply terminal DV33SB is reduced to 0V rapidly, and the characteristic of utilizing capacitance voltage not suddenly change makes switching diode D5 be able to conducting, and the electric charge on the capacitor C E48 discharges by dc power supply terminal DV33SB and diode D5.Because the RC time constant of discharge loop is very little, the voltage on the electrochemical capacitor CE48 is reduced to 0V rapidly, thereby carries out the preparation that resets for start next time powers on.By setting up the repid discharge loop, make reset circuit of the present utility model can satisfy the requirement of electric equipment high-speed switch machine, effectively improved the stability of system's operation.
Also be connected with a ground capacity C9 at the ORESET# that is connected with described functional chip resetting pin end, the effective filtering interfering ripple of making an uproar, the hold reset signal is pure.
Therefore reset circuit of the present utility model is simple in structure, and the parameter matching ratio of various elements is easier to, and can export the reset signal of accurate sequential automatically according to the state of power supply potential, thereby provides powerful guarantee for the reliability service of complete machine.During the numerous electric equipment products that need integrated chip to set up hardware circuit such as television set, DVD, computer that can be widely applied to this reset circuit design.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. reset circuit, comprise electric equipment power on the back output dc voltage power end and reset signal output, it is characterized in that: in described reset circuit, also include a storage capacitor, the described power end of its anodal connection, negative pole connects described reset signal output, resistance grounded on the other hand on the one hand.
2. reset circuit according to claim 1 is characterized in that: described storage capacitor is an electrochemical capacitor, and its negative pole connects the negative electrode of a switching diode, the plus earth of described switching diode.
3. reset circuit according to claim 1 and 2 is characterized in that: described reset signal output directly connects the resetting pin that needs the functional chip that high level resets.
4. reset circuit according to claim 1 and 2 is characterized in that: described reset signal output connects the resetting pin need the functional chip that low level resets by a negative circuit.
5. reset circuit according to claim 4, it is characterized in that: in described negative circuit, include a NPN type triode, the base stage of described triode connects described reset signal output, collector electrode connects described power end on the one hand, connect the described resetting pin that needs the functional chip that low level resets on the other hand, grounded emitter.
6. television set with reset circuit, described reset circuit is arranged on the TV set circuit plate, comprise television set power on the back output dc voltage power end and reset signal output, it is characterized in that: in described reset circuit, also include a storage capacitor, the described power end of its anodal connection, negative pole connects described reset signal output, resistance grounded on the other hand on the one hand.
7. television set according to claim 6 is characterized in that: described storage capacitor is an electrochemical capacitor, and its negative pole connects the negative electrode of a switching diode, the plus earth of described switching diode.
8. according to claim 6 or 7 described television sets, it is characterized in that: described reset signal output directly connects the resetting pin that needs the functional chip that high level resets.
9. according to claim 6 or 7 described television sets, it is characterized in that: described reset signal output connects the resetting pin need the functional chip that low level resets by a negative circuit.
10. television set according to claim 9, it is characterized in that: in described negative circuit, include a NPN type triode, the base stage of described triode connects described reset signal output, collector electrode connects described power end on the one hand, connect the described resetting pin that needs the functional chip that low level resets on the other hand, grounded emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200202969U CN201039316Y (en) | 2007-04-03 | 2007-04-03 | A reset circuit and TV set with above reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200202969U CN201039316Y (en) | 2007-04-03 | 2007-04-03 | A reset circuit and TV set with above reset circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201039316Y true CN201039316Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200202969U Expired - Fee Related CN201039316Y (en) | 2007-04-03 | 2007-04-03 | A reset circuit and TV set with above reset circuit |
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| CN (1) | CN201039316Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931959A (en) * | 2012-02-13 | 2013-02-13 | 北京七芯中创科技有限公司 | Circuit for quickly discharging power-on resetting circuit subjected to power failure |
| CN102023692B (en) * | 2009-09-23 | 2013-04-17 | 深圳Tcl新技术有限公司 | Reset circuit |
| CN105959600A (en) * | 2016-06-29 | 2016-09-21 | 重庆惠科金扬科技有限公司 | Circuit capable of quickly turning off TV indicator lamp after power off, and television |
| CN106452040A (en) * | 2016-10-20 | 2017-02-22 | 广州金升阳科技有限公司 | Starting circuit |
| CN110417260A (en) * | 2019-07-23 | 2019-11-05 | 武汉洲际电讯科技股份有限公司 | A kind of switching power circuit of detectable electric current |
-
2007
- 2007-04-03 CN CNU2007200202969U patent/CN201039316Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023692B (en) * | 2009-09-23 | 2013-04-17 | 深圳Tcl新技术有限公司 | Reset circuit |
| CN102931959A (en) * | 2012-02-13 | 2013-02-13 | 北京七芯中创科技有限公司 | Circuit for quickly discharging power-on resetting circuit subjected to power failure |
| CN105959600A (en) * | 2016-06-29 | 2016-09-21 | 重庆惠科金扬科技有限公司 | Circuit capable of quickly turning off TV indicator lamp after power off, and television |
| CN105959600B (en) * | 2016-06-29 | 2023-04-07 | 重庆惠科金扬科技有限公司 | Circuit for quickly turning off TV indicator lamp after power failure and television |
| CN106452040A (en) * | 2016-10-20 | 2017-02-22 | 广州金升阳科技有限公司 | Starting circuit |
| CN106452040B (en) * | 2016-10-20 | 2019-07-19 | 广州金升阳科技有限公司 | Start-up circuit |
| CN110417260A (en) * | 2019-07-23 | 2019-11-05 | 武汉洲际电讯科技股份有限公司 | A kind of switching power circuit of detectable electric current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110403 |