CN200994126Y - Transistor driving circuit - Google Patents
Transistor driving circuit Download PDFInfo
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- CN200994126Y CN200994126Y CN 200620159961 CN200620159961U CN200994126Y CN 200994126 Y CN200994126 Y CN 200994126Y CN 200620159961 CN200620159961 CN 200620159961 CN 200620159961 U CN200620159961 U CN 200620159961U CN 200994126 Y CN200994126 Y CN 200994126Y
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- triode
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- audion
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- base stage
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Abstract
The utility model provides a driving circuit of audion, which comprises the first resistance, the second resistance, the third resistance, the first capacitor and the first audion, wherein, one end of the first resistance is connected with a signal resource and the other end of the first resistance is connected with the base electrode of the first audion by the second resistance. The first capacitor is connected with the second resistance in parallel and the collector of the first audion is connected with the load resistance, meanwhile, the emitting electrode is earthed. The both ends of the third resistance are respectively connected with the base and emitting electrode of the first audion. The driving circuit of audion drives the first audion according to signals from signal resource. The utility model is also characterized that at least one anisotropic conductive part connected with the base and emitting electrode of the first audion in parallel. The driving circuit of audion provided by this utility model is extensively applied in various electric circuits of audion needing quick switching actions, which not only drives the audion but also protects audion to promote reliability of circuit; furthermore, the utility model also enhances speed of switching on of audion and improves performance of circuit.
Description
Technical field
The utility model relates to electronic circuit field, particularly a kind of transistor drive circuit.
Background technology
Transistor drive circuit is the circuit that is used to drive the triode switch action, is applied to comprise in the various electronic circuits of the triode that needs the high-speed switch action, for example switch power supply equipment.
Existing a kind of transistor drive circuit, comprise resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and triode Q1, wherein resistance R 1 one ends connect signal source, the other end is connected by the base stage of resistance R 2 with triode Q1, capacitor C 1 is in parallel with resistance R 2, and the collector electrode of triode Q1 connects load, grounded emitter, resistance R 3 two ends are connected with emitter with the base stage of triode Q1 respectively, and this transistor drive circuit can drive triode Q1 according to the signal from signal source.When the signal source input high level, this transistor drive circuit provides by base stage for triode Q1 and points to the drive current of emitter and make triode Q1 open-minded fast; When the signal source input low level, this transistor drive circuit provides by emitter for triode Q1 and points to the drive current of base stage and triode Q1 is turn-offed fast.
This triode Q1 is generally operational in the state of high-speed switch as from the foregoing, have two defectives: a defective is that triode may be damaged in the work, reason is that this transistor drive circuit driving triode Q1 turns on and off fast, capacitor C 1 wherein is that capacitor C 1 is at work by quick charge and discharge for fast driving triode Q1 establishes.In the discharge process of capacitor C 1, on triode Q1, produce the voltage Veb that emitter points to base stage, this voltage may exceed the maximum voltage (the about 6V of maximum Veb voltage that general triode can bear) that triode Q1 can bear, and may damage triode Q1 under this situation.
It is slower that another defective is that triode Q1 opens speed, reason is in a work period (triode Q1 turns on and off and once is called a work period), the discharge of capacitor C 1 may have little time to have put in this transistor drive circuit, cause to offer in the next cycle triode Q1 and open required drive current fast, triode Q1 opens the charging current that required drive current major part comes from capacitor C 1 fast, if the discharge of preceding cycle capacitor C 1 does not have enough time to have put, the charging current of capacitor C 1 is reduced, charging charge also reduces, triode Q1 service time is longer, opens just slow.
Summary of the invention
The purpose of this utility model is to provide a kind of transistor drive circuit, can realize the driving to triode, and can protect triode, improves circuit reliability, can also accelerate triode and open speed, improves circuit performance.
The utility model provides a kind of transistor drive circuit, comprise first resistance, second resistance, the 3rd resistance, first electric capacity and first triode, wherein first resistance, one end connects signal source, the other end is connected by the base stage of second resistance with first triode, first electric capacity is in parallel with second resistance, the collector electrode of first triode connects load, grounded emitter, the 3rd resistance two ends are connected with emitter with the base stage of first triode respectively, transistor drive circuit drives first triode according to the signal from signal source, described transistor drive circuit also comprises at least one unidirectional conduction device, and unidirectional conduction device is in parallel with the base stage and the emitter of first triode.
This unidirectional conduction device is a diode, and diode anode is connected with the emitter of first triode, and negative electrode is connected with the base stage of first triode.This unidirectional conduction device can be second triode, and this second triode can be the NPN triode, and the base stage of NPN triode is connected with the emitter of collector electrode with first triode, and the emitter of NPN triode is connected with the base stage of first triode.Second triode can also be the PNP triode, and the base stage of PNP triode is connected with the base stage of collector electrode with first triode, and the emitter of PNP triode is connected with the emitter of first triode.Unidirectional conduction device can also be circuit structure or the integrated circuit with unidirectional conducting.
The transistor drive circuit that adopts the utility model to provide; can be widely used in comprising in the various electronic circuits of the triode that needs the high-speed switch action; not only can realize driving to triode; and can protect triode; improve circuit reliability, can also accelerate triode and open speed, improve circuit performance; and need not existing transistor drive circuit is done big modification, need not to drop into great amount of cost.
Description of drawings
Fig. 1 is the prior art circuits schematic diagram;
Fig. 2 is the utility model first embodiment circuit theory diagrams;
Fig. 3 is the utility model second embodiment circuit theory diagrams;
Fig. 4 is the utility model the 3rd embodiment circuit theory diagrams.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
With reference to Fig. 1, the prior art circuits schematic diagram is shown.
Existing transistor drive circuit comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and triode Q1, wherein resistance R 1 one ends connect signal source, the other end is connected by the base stage of resistance R 2 with triode Q1, capacitor C 1 is in parallel with resistance R 2, the collector electrode of triode Q1 connects load, grounded emitter, resistance R 3 two ends are connected with emitter with the base stage of triode Q1 respectively, and this transistor drive circuit can drive triode Q1 according to the signal from signal source.
On the prior art basis, first embodiment is proposed, circuit theory diagrams are as shown in Figure 2.
First embodiment comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 1, triode Q1 and diode D1, wherein resistance R 1 one ends connect signal source, the other end is connected by the base stage of resistance R 2 with triode Q1, capacitor C 1 is in parallel with resistance R 2, the collector electrode of triode Q1 connects load, grounded emitter, and resistance R 3 two ends are connected with emitter with the base stage of triode Q1 respectively, diode D1 anode is connected with the emitter of triode Q1, and negative electrode is connected with the base stage of triode Q1.
When the signal source input high level, the transistor drive circuit of first embodiment provides by base stage for triode Q1 and points to the drive current of emitter and make triode Q1 open-minded fast; When the signal source input low level; the first embodiment transistor drive circuit provides by emitter for triode Q1 and points to the drive current of base stage and triode Q1 is turn-offed fast; and in the discharge process of capacitor C 1; the voltage Veb that triode Q1 bears is clamped down on because of diode D1; make Veb voltage very low; be diode D1 conduction voltage drop, therefore protected triode Q1.In addition, owing to added diode D1, the discharge of capacitor C 1 can have been put in moment, the charging that guarantees interim capacitor C 1 next week almost begins charging from no-voltage, charging current strengthens, and promptly strengthens the drive current of triode Q1, accelerates the speed of opening of triode Q1.
The present invention proposes second embodiment, and circuit theory diagrams as shown in Figure 3.
Second embodiment comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 1, triode Q1 and NPN utmost point pipe Q2, wherein resistance R 1 one ends connect signal source, the other end is connected with triode Q1 base stage by resistance R 2, capacitor C 1 is in parallel with resistance R 2, the collector electrode of triode Q1 connects load, grounded emitter, resistance R 3 two ends are connected with emitter with the base stage of triode Q1 respectively, the base stage of triode Q2 is connected with the emitter of collector electrode with triode Q1, and the emitter of triode Q2 is connected with the base stage of triode Q1.
When the signal source input high level of the transistor drive circuit of present embodiment, provide by base stage for triode Q1 and point to the drive current of emitter and make triode Q1 open-minded fast; When the signal source input low level, provide by emitter for triode Q1 and point to the drive current of base stage and triode Q1 is turn-offed fast.And triode Q2 produces the electric current from the collector electrode to the emitter in the capacitor discharge process, and the voltage Veb that triode Q1 is born is clamped down on, and has therefore protected triode Q1.In addition, owing to added triode Q2, the discharge of capacitor C 1 can have been put in moment, the charging that guarantees interim capacitor C 1 next week almost begins charging from no-voltage, charging current strengthens, and promptly strengthens the drive current of triode Q1, accelerates the speed of opening of triode Q1.
The utility model also proposes the 3rd embodiment, and circuit theory diagrams as shown in Figure 4.
The 3rd embodiment adopts PNP triode Q3, and its base stage is connected with the base stage of collector electrode with triode Q1, and the emitter of triode Q3 is connected with the emitter of triode Q1.The circuit working principle and second embodiment of the 3rd embodiment are similar, so do not give unnecessary details.
Above-mentioned three embodiment adopt diode, triode as unidirectional conduction device respectively, but the unidirectional as can be known conduction device scope of those skilled in the art more than that.The stack of unidirectional conducting components and parts more than one, the circuit structure that perhaps has unidirectional conducting function, the integrated circuit that perhaps has unidirectional conducting function can simply substitute single diode or triode, realizes the technical solution of the utility model.
Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (6)
1. transistor drive circuit, comprise first resistance, second resistance, the 3rd resistance, first electric capacity and first triode, wherein first resistance, one end connects signal source, the other end is connected by the base stage of second resistance with first triode, first electric capacity is in parallel with second resistance, the collector electrode of first triode connects load, grounded emitter, the 3rd resistance two ends are connected with emitter with the base stage of described first triode respectively, described transistor drive circuit drives described first triode according to the signal from signal source, it is characterized in that, also comprise at least one unidirectional conduction device, described unidirectional conduction device is connected with emitter with the base stage of described first triode.
2. transistor drive circuit according to claim 1, it is characterized in that, described unidirectional conduction device is a diode, and described diode anode is connected with the emitter of described first triode, and described diode cathode is connected with the base stage of described first triode.
3. transistor drive circuit according to claim 1 is characterized in that, described unidirectional conduction device is second triode.
4. transistor drive circuit according to claim 3, it is characterized in that, described second triode is the NPN triode, and the base stage of described NPN triode is connected with the emitter of collector electrode with described first triode, and the emitter of described NPN triode is connected with the base stage of described first triode.
5. transistor drive circuit according to claim 3, it is characterized in that, described second triode is the PNP triode, and the base stage of described PNP triode is connected with the base stage of collector electrode with described first triode, and the emitter of described PNP triode is connected with the emitter of described first triode.
6. transistor drive circuit according to claim 1 is characterized in that, described unidirectional conduction device is circuit structure or the integrated circuit with unidirectional conducting function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620159961 CN200994126Y (en) | 2006-11-30 | 2006-11-30 | Transistor driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620159961 CN200994126Y (en) | 2006-11-30 | 2006-11-30 | Transistor driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200994126Y true CN200994126Y (en) | 2007-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620159961 Expired - Fee Related CN200994126Y (en) | 2006-11-30 | 2006-11-30 | Transistor driving circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN200994126Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662205A (en) * | 2008-08-27 | 2010-03-03 | 德昌电机(深圳)有限公司 | Boost-buck accelerating circuit |
| CN101674001A (en) * | 2008-09-08 | 2010-03-17 | 德昌电机(深圳)有限公司 | Bridge driving circuit with blind area control |
-
2006
- 2006-11-30 CN CN 200620159961 patent/CN200994126Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662205A (en) * | 2008-08-27 | 2010-03-03 | 德昌电机(深圳)有限公司 | Boost-buck accelerating circuit |
| CN101662205B (en) * | 2008-08-27 | 2013-07-10 | 德昌电机(深圳)有限公司 | Boost-buck accelerating circuit |
| CN101674001A (en) * | 2008-09-08 | 2010-03-17 | 德昌电机(深圳)有限公司 | Bridge driving circuit with blind area control |
| CN101674001B (en) * | 2008-09-08 | 2014-01-01 | 德昌电机(深圳)有限公司 | Bridge driving circuit with blind area control |
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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: 20071219 Termination date: 20151130 |
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| EXPY | Termination of patent right or utility model |