CN200953596Y - Resetting circuit and television with said reetting circuit - Google Patents
Resetting circuit and television with said reetting circuit Download PDFInfo
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- CN200953596Y CN200953596Y CNU2006200111772U CN200620011177U CN200953596Y CN 200953596 Y CN200953596 Y CN 200953596Y CN U2006200111772 U CNU2006200111772 U CN U2006200111772U CN 200620011177 U CN200620011177 U CN 200620011177U CN 200953596 Y CN200953596 Y CN 200953596Y
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Abstract
The utility model discloses a reset circuit and TV set with reset circuit, comprising a PNP type triode. The base pole of the PNP type triode is connected to the energy storage capacitor on the one side and connected to a DC power source on the other side; an emitting pole is connected to the DC power source; a collector is connected to the reset signal output end. The utility model, which adopts separate component to build up reset circuit and provide power supply and reset signal for the internal control system of the TV set, does not only simplify the circuit structure, save the space occupied by the PCB, facilitate the overall layout design of the circuit board, but also avoid the use of specialized chip, lower down the manufacturing cost and enhance the market competitiveness of the TV set.
Description
Technical field
The utility model relates to a kind of improvement of reset circuit, specifically, relates to a kind of reset circuit that adopts discrete component to set up and form.
Background technology
In audiovisual electric appliances products such as television set; often can use various reset circuits, most of reset circuits adopt the microcontroller monitoring chip to realize, as shown in Figure 1; its model is MAX706, and the system of being specifically designed to powers on, produce reset signal output when power down and supply power voltage reduce.The monitoring pin FEI of described microcontroller monitoring chip MAX706 connects DC power supply VDD through resistor voltage divider network R4, R5, current potential to DC power supply detects, when detecting electrifying DC power supply, power down or voltage reduction, provide reset signal RESET by its output RST each functional chip in electric equipment, the controlled function chip accurately resets.Because reset circuit adopts integrated chip to cooperate peripheral circuit to connect and realizes that therefore, the circuit structure complexity need take bigger pcb board space, has promoted production cost, is unfavorable for the market competitiveness of home appliances such as television set.
Summary of the invention
The utility model is set up reset circuit complex structure, problem that cost is high in order to solve the available technology adopting integrated chip, a kind of novel reset circuit is provided, entire circuit is set up by discrete component fully and is formed, and has effectively simplified circuit structure, has reduced cost.
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 a positive-negative-positive triode, the base stage of described positive-negative-positive triode connects storage capacitor on the one hand, connects a direct current power supply on the other hand, emitter connects described DC power supply, and collector electrode connects the reset signal output.
For when the power supply power-fail, electric charge in the storage capacitor can be fallen by timely bleed off, between the base stage of described DC power supply and positive-negative-positive triode, be connected with the parallel branch of resistance and diode, the negative electrode of described diode connects described DC power supply, and anode connects the base stage of described positive-negative-positive triode.
Be connected with a switching diode between the emitter of described positive-negative-positive triode and DC power supply, the negative electrode of described switching diode connects the emitter of positive-negative-positive triode, and anode connects described DC power supply.The emitter of described positive-negative-positive triode is through a capacity earth, the collector electrode resistance grounded.
For the reset signal of output is carried out the filtering amplitude limit, on the line of the collector electrode of described positive-negative-positive triode and reset signal output, be connected with the voltage stabilizing didoe and the filter capacitor of ground connection.
Compared with prior art, advantage of the present utility model and good effect are: the utility model provides power-on reset signal by adopting discrete component to set up reset circuit for the television set internal control system, not only simplified circuit structure, saved taking up room of pcb board, made things convenient for the integral layout design of circuit board, and avoided the use of special chip, and reduced production cost, improved the market competitiveness of tv product.
Description of drawings
Fig. 1 is the schematic diagram of existing reset circuit;
Fig. 2 is the reset circuit schematic diagram that the utility model proposes.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The utility model adopts discrete component to set up reset circuit and provides reset signal for the television set internal control system, and control chip accurately resets, and its circuit theory diagrams are referring to shown in Figure 2.
Among Fig. 2, the emitter of positive-negative-positive triode V29 connects 2 pin of a pair of diode component D20, the 3 pin connection+3.3V DC power supply of double diode device D20,1 pin connects the base stage of described positive-negative-positive triode V29 on the one hand, on the other hand through a storage capacitor C358 ground connection.Between 3 pin of described double diode device D20 and 1 pin, be parallel with a resistance R 162, form the charging path that powers on storage capacitor C358.The emitter of described positive-negative-positive triode V29 is through filter capacitor C352 ground connection, and collector electrode connects the reset signal output through resistance R 157 on the other hand on the one hand through resistance R 163 ground connection.On the line of the collector electrode of described positive-negative-positive triode V29 and reset signal output, be connected with the voltage stabilizing didoe D62 and the filter capacitor C146 of ground connection.
Its operation principle is: when power supply+3.3V powers on, because the voltage at capacitor C 358 two ends can not suddenly change, so, the base potential of positive-negative-positive triode V29 is low, and the emitter current potential is high, thus triode V29 conducting when television set powers on, and its collector potential is a high level, this moment, the reset signal SYS_RST of output was a high level, resetted effectively.Subsequently ,+3.3V DC power supply is charged for storage capacitor C358 by resistance R 162, when the base potential of positive-negative-positive triode V29 is 3.3V-0.7V-0.7V=1.9V, triode V29 ends, and at this moment, reset signal SYS_RST is a low level, reset and remove, the television set operate as normal.When the television set power down, the electric charge among the storage capacitor C358 is by being connected a rapid bleed off of diode between 1 pin, 3 pin among the double diode device D20, in order to avoid influence television set abnormal phenomenon that occurs resetting during the starting up once more.The effect that is connected the voltage stabilizing didoe D62 on the collector electrode of positive-negative-positive triode V29 is that the overtension that prevents the output of positive-negative-positive triode V29 collector electrode damages television set built-in function chip; The effect of capacitor C 146 is that the high order harmonic component in the reset signal is filtered out, and resets in order to avoid make the mistake, and influences the television set operate as normal.
The utility model has been realized automatically reseting of inner each functional chip of television set by adopting above-mentioned simple circuit configuration under the condition of not using special chip, effectively saved circuit cost.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, it is characterized in that: comprise a positive-negative-positive triode, the base stage of described positive-negative-positive triode connects storage capacitor on the one hand, connects a direct current power supply on the other hand, and emitter connects described DC power supply, and collector electrode connects the reset signal output.
2. reset circuit according to claim 1, it is characterized in that: the parallel branch that between the base stage of described DC power supply and positive-negative-positive triode, is connected with resistance and diode, the negative electrode of described diode connects described DC power supply, and anode connects the base stage of described positive-negative-positive triode.
3. reset circuit according to claim 1 and 2 is characterized in that: the emitter of described positive-negative-positive triode is through a capacity earth.
4. reset circuit according to claim 3, it is characterized in that: between the emitter of described positive-negative-positive triode and DC power supply, be connected with a switching diode, the negative electrode of described switching diode connects the emitter of positive-negative-positive triode, and anode connects described DC power supply.
5. reset circuit according to claim 1 and 2 is characterized in that: the collector electrode resistance grounded of described positive-negative-positive triode is connected with the voltage stabilizing didoe and the filter capacitor of ground connection on the line of itself and reset signal output.
6. television set with the described reset circuit of claim 1, it is characterized in that: comprise a positive-negative-positive triode, the base stage of described positive-negative-positive triode connects storage capacitor on the one hand, connect a direct current power supply on the other hand, emitter connects described DC power supply, and collector electrode connects the reset signal output.
7. television set according to claim 6, it is characterized in that: the parallel branch that between the base stage of described DC power supply and positive-negative-positive triode, is connected with resistance and diode, the negative electrode of described diode connects described DC power supply, and anode connects the base stage of described positive-negative-positive triode.
8. according to claim 6 or 7 described television sets, it is characterized in that: the emitter of described positive-negative-positive triode is through a capacity earth.
9. television set according to claim 8, it is characterized in that: between the emitter of described positive-negative-positive triode and DC power supply, be connected with a switching diode, the negative electrode of described switching diode connects the emitter of positive-negative-positive triode, and anode connects described DC power supply.
10. according to claim 6 or 7 described television sets, it is characterized in that: the collector electrode resistance grounded of described positive-negative-positive triode is connected with the voltage stabilizing didoe and the filter capacitor of ground connection on the line of itself and reset signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200111772U CN200953596Y (en) | 2006-10-18 | 2006-10-18 | Resetting circuit and television with said reetting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200111772U CN200953596Y (en) | 2006-10-18 | 2006-10-18 | Resetting circuit and television with said reetting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200953596Y true CN200953596Y (en) | 2007-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200111772U Expired - Fee Related CN200953596Y (en) | 2006-10-18 | 2006-10-18 | Resetting circuit and television with said reetting circuit |
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| CN (1) | CN200953596Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505381B (en) * | 2009-02-23 | 2010-12-01 | 深圳创维－Rgb电子有限公司 | Reset circuit for television set switching on and off |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN109491431A (en) * | 2018-11-14 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of boot configuration circuit according to supply voltage adjustable height |
-
2006
- 2006-10-18 CN CNU2006200111772U patent/CN200953596Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505381B (en) * | 2009-02-23 | 2010-12-01 | 深圳创维－Rgb电子有限公司 | Reset circuit for television set switching on and off |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN109491431A (en) * | 2018-11-14 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of boot configuration circuit according to supply voltage adjustable height |
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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: 20070926 Termination date: 20101018 |