CN201438694U - Reset circuit and electrical equipment - Google Patents
Reset circuit and electrical equipment Download PDFInfo
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- CN201438694U CN201438694U CN2009203057330U CN200920305733U CN201438694U CN 201438694 U CN201438694 U CN 201438694U CN 2009203057330 U CN2009203057330 U CN 2009203057330U CN 200920305733 U CN200920305733 U CN 200920305733U CN 201438694 U CN201438694 U CN 201438694U
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Abstract
The embodiment of the utility model relates to a reset circuit which includes a voltage input terminal, a reset capacitor and a triode. The positive terminal of the reset capacitor is connected with the voltage input terminal, and the negative terminal thereof is grounded through a time constant resistor; two ends of the time constant resistor are connected in parallel with a clamping diode; and the triode is connected with the negative terminal of the reset capacitor through a base current limiting resistor, an emitting electrode is grounded, and a collecting electrode is connected with the voltage input terminal through a pull-up resistor and outputs reset signals. In addition, the embodiment of the utility model further provides electrical equipment. The embodiment of the utility model has the advantages of good reset reliability, strong capacity of resisting disturbance, and high cost performance.
Description
Technical field
The utility model relates to a kind of reset circuit and electrical equipment.
Background technology
Reset circuit relatively more commonly used at present has resistance capacitance reset circuit (RC reset circuit), when it mainly powers on a voltage input end reset capacitance is charged, because the reset capacitance both end voltage can not be suddenlyd change, keeping a period of time low level at reset capacitance anode (being the reset signal output) (is reset signal, be generally reseting pulse signal), after reset capacitance is full of electricity, reseting procedure finishes, this reset circuit reseting procedure time is long, disturbed easily, and continuous switch motion meeting causes the consequence of malreduction.
The utility model content
The utility model embodiment technical problem to be solved is, a kind of reset circuit and corresponding electrical equipment are provided, and its unfailing performance that resets is good, and antijamming capability is strong, the cost performance height.
For solving the problems of the technologies described above, the utility model embodiment adopts following technical scheme:
A kind of reset circuit comprises:
Voltage input end, reset capacitance, triode, described reset capacitance anode links to each other with described voltage input end, negative terminal passes through a time constant grounding through resistance, a described time constant resistance two ends clamp diode in parallel, described transistor base by the base stage current-limiting resistance link to each other with described reset capacitance negative terminal, grounded emitter, collector electrode links to each other with described voltage input end by pull-up resistor and export reset signal.
A kind of electrical equipment comprises reset circuit, and described reset circuit comprises:
Voltage input end, reset capacitance, triode, described reset capacitance anode links to each other with described voltage input end, negative terminal passes through a time constant grounding through resistance, a described time constant resistance two ends clamp diode in parallel, described transistor base by the base stage current-limiting resistance link to each other with described reset capacitance negative terminal, grounded emitter, collector electrode links to each other with described voltage input end by pull-up resistor and export reset signal.
The beneficial effect of the utility model embodiment is:
By a kind of reset circuit and electrical equipment are provided, its unfailing performance that resets is good, and antijamming capability is strong, the cost performance height.
Below in conjunction with accompanying drawing the utility model embodiment is described in further detail.
Description of drawings
Fig. 1 is the schematic diagram of the reset circuit of the utility model embodiment.
Embodiment
As shown in Figure 1, the utility model embodiment provides a kind of reset circuit, and the electrical equipment of the utility model embodiment comprises this reset circuit too, repeat no more, and reset circuit comprises voltage input end DSPVCC33, reset capacitance C4 (parameter be 10 microfarads/16 volt), triode Q8 (model is BT3904), reset capacitance C4 anode links to each other with voltage input end DSPVCC33, negative terminal is by a time constant resistance R 26 (parameter is 15 kilohms) ground connection, time constant resistance R 26 a two ends clamp diode D20 (model is 4148) in parallel, triode Q8 base stage (1 end) links to each other with reset capacitance C4 negative terminal by base stage current-limiting resistance R25 (parameter is 4.7 kilohms), emitter (2 end) ground connection, collector electrode (3 end) links to each other with voltage input end DSPVCC33 by pull-up resistor R24 (parameter is 10 kilohms) and exports reset signal (RESET) chip that is reset (as DVD decoding master chip) is resetted, like this, start shooting moment, voltage input end DSPVCC33 (+5 volts) charges to reset capacitance C4, because reset capacitance C4 both end voltage can not be suddenlyd change, so produce an induced electromotive force at reset capacitance C4 negative terminal, it is reset signal, reset capacitance is full of electricity back induced electromotive force and disappears, reset signal disappears, reseting procedure finishes, time constant resistance R 26 is used for controlling the time that discharges and recharges and the reset signal pulse duration of reset capacitance C4, carrying out paraphase through triode Q8 amplifies, and can reduce the output impedance of reset circuit, to improve antijamming capability, its unfailing performance that resets is good, antijamming capability is strong, the cost performance height, for example, when 3.3 volts of power supplys dropped to 0.7 volt, reset signal had 109 milliseconds resetting time;
In addition, reset circuit also comprises the anti-interference capacitor C2 (parameter is 0.1 microfarad) that an end links to each other with triode Q8 emitter (2 end), the other end links to each other with triode Q8 collector electrode (3 end), like this, can further improve antijamming capability.
Need to prove that above-mentioned reset circuit is low level reset circuits such as DVD video disc player reset circuit or microcomputer reset circuit, electrical equipment can be DVD video disc player or microcomputer.
The above is an embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (6)
1. a reset circuit is characterized in that, comprising:
Voltage input end, reset capacitance, triode, described reset capacitance anode links to each other with described voltage input end, negative terminal passes through a time constant grounding through resistance, a described time constant resistance two ends clamp diode in parallel, described transistor base by the base stage current-limiting resistance link to each other with described reset capacitance negative terminal, grounded emitter, collector electrode links to each other with described voltage input end by pull-up resistor and export reset signal.
2. reset circuit as claimed in claim 1 is characterized in that, described reset circuit also comprises the anti-interference capacitor that an end links to each other with described transistor emitter, the other end links to each other with described transistor collector.
3. reset circuit as claimed in claim 1 or 2 is characterized in that, described reset circuit is DVD video disc player reset circuit or microcomputer reset circuit.
4. an electrical equipment comprises reset circuit, it is characterized in that, described reset circuit comprises:
Voltage input end, reset capacitance, triode, described reset capacitance anode links to each other with described voltage input end, negative terminal passes through a time constant grounding through resistance, a described time constant resistance two ends clamp diode in parallel, described transistor base by the base stage current-limiting resistance link to each other with described reset capacitance negative terminal, grounded emitter, collector electrode links to each other with described voltage input end by pull-up resistor and export reset signal.
5. electrical equipment as claimed in claim 4 is characterized in that, described reset circuit also comprises the anti-interference capacitor that an end links to each other with described transistor emitter, the other end links to each other with described transistor collector.
6. as claim 4 or 5 described electrical equipment, it is characterized in that described electrical equipment is DVD video disc player or microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203057330U CN201438694U (en) | 2009-07-07 | 2009-07-07 | Reset circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203057330U CN201438694U (en) | 2009-07-07 | 2009-07-07 | Reset circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201438694U true CN201438694U (en) | 2010-04-14 |
Family
ID=42400663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203057330U Expired - Fee Related CN201438694U (en) | 2009-07-07 | 2009-07-07 | Reset circuit and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201438694U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076134A (en) * | 2010-11-11 | 2011-05-25 | 苏州合欣美电子科技有限公司 | Reset circuit of solar street light |
| CN109327213A (en) * | 2018-08-09 | 2019-02-12 | 芜湖智久机器人有限公司 | A kind of micro-control unit reset circuit and its repositioning method, device based on USB |
| CN110497821A (en) * | 2019-08-20 | 2019-11-26 | 江西恒动新能源有限公司 | A kind of charging wake-up system and its control method |
-
2009
- 2009-07-07 CN CN2009203057330U patent/CN201438694U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076134A (en) * | 2010-11-11 | 2011-05-25 | 苏州合欣美电子科技有限公司 | Reset circuit of solar street light |
| CN109327213A (en) * | 2018-08-09 | 2019-02-12 | 芜湖智久机器人有限公司 | A kind of micro-control unit reset circuit and its repositioning method, device based on USB |
| CN110497821A (en) * | 2019-08-20 | 2019-11-26 | 江西恒动新能源有限公司 | A kind of charging wake-up system and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100414 Termination date: 20150707 |
|
| EXPY | Termination of patent right or utility model |