CN204731673U - The driving circuit of speed probe - Google Patents
The driving circuit of speed probe Download PDFInfo
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- CN204731673U CN204731673U CN201520492850.8U CN201520492850U CN204731673U CN 204731673 U CN204731673 U CN 204731673U CN 201520492850 U CN201520492850 U CN 201520492850U CN 204731673 U CN204731673 U CN 204731673U
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Abstract
The utility model discloses the driving circuit of speed probe, comprise signal input line, the first triode, the second triode, the 3rd triode, the 4th triode, the first resistance, the second resistance, power supply and output line, first resistance two ends are connected with signal input line and the first transistor base respectively, and the second resistance two ends are connected with the collector of the first triode and power supply respectively.The base stage of the second triode is connected with the collector of the first triode, the base stage of the 3rd triode is connected with the emitter of the second triode, second triode is all connected with power supply with the collector of the 3rd triode, the base stage of the 4th triode, collector connect the emitter of the first triode and the emitter of the 3rd triode respectively, its grounded emitter, signal input line is connected on the circuit between the 3rd transistor emitter and the 4th transistor collector.The utility model one-piece construction is simple, is convenient to realize, and during the utility model application, drive current is large, and the high level of output is stablized.
Description
Technical field
The utility model relates to sensor, specifically the driving circuit of speed probe.
Background technology
Sensor be a kind of with certain degree of accuracy measured convert to have with it determine corresponding relation, be convenient to the measurement mechanism of certain physical quantity applied.It is the loudspeaker of acquisition target and infosystem, is system senses, obtains and the window of Detection Information.For the object rotated, its rotating speed is difficult to direct-detection, generally all adopts indirect method to carry out, and namely by various sensor, rotating speed is become other physical quantity, as mechanical quantity, electricity, magnetic and light etc., then shows.
Speed probe is the one in numerous sensor type, and it plays an important role in departments such as industry, agricultural and traffic, and is widely applied in these areas.Such as, in machine tooling, monitor the rotating speed of main shaft with speed probe; In communications and transportation, speed probe is mainly used to measure the rotating speed of rotary part and the travel speeds of automobile such as big-and-middle-sized motorcar engine main shaft, power output shaft, axletree; Agriculturally, speed probe is mainly used to monitor the parts that large-scale combined harvester engine spindle, detachment roller, cereal conveying main spindle etc. rotate, so that Timeliness coverage is abnormal and process in time, thus prevent the damage of part, obtain the benefit arranged.
Namely the signal of existing speed probe collection exports usually after shaping, its electric current exported is limited, so general not Direct driver load, but first through overdrive circuit, using the input of the signal voltage after shaping as driving stage, more outwards provide drive current by driving stage.The driving method commonly used at present adopts open collector to drive method, and it exists the shortcomings such as the little high level instability with exporting of drive current.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides the driving circuit of the stable speed probe of a kind of drive current high level that is large, that export.
The utility model solves the problem and is achieved through the following technical solutions: the driving circuit of speed probe, comprise signal input line, first triode, second triode, 3rd triode, 4th triode, first resistance, second resistance, 3rd resistance, 4th resistance, power supply and output line, described first resistance two ends are connected with signal input line and the first transistor base respectively, described second resistance two ends are connected with the collector of the first triode and power supply respectively, described 3rd resistance one end is connected with the emitter of the first triode, its other end ground connection, described 4th resistance one end is connected with the emitter of the second triode, its other end ground connection, the base stage of described second triode is connected with the collector of the first triode, the base stage of the 3rd triode is connected with the emitter of the second triode, second triode is all connected with power supply with the collector of the 3rd triode, the base stage of described 4th triode, collector connect the emitter of the first triode and the emitter of the 3rd triode respectively, its grounded emitter, described signal input line is connected on the circuit between the 3rd transistor emitter and the 4th transistor collector.
Further, described first triode, the second triode, the 3rd triode and the 4th triode are NPN triode.
Phase compared with the prior art, the utility model has following beneficial effect: the utility model one-piece construction is simple, use components and parts are few, be convenient to realize, cost is low, has the advantage that drive current is large, bringing onto load power is strong and power consumption is little during the utility model application, and the utility model is when variation in a big way appears in output stream, its high level exported still can maintain in a less scope, can ensure the stability of output high level.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model specific embodiment.
Name in accompanying drawing corresponding to Reference numeral is called: 1, signal input line, 2, output line, T1, the first triode, T2, the second triode, T3, the 3rd triode, T4, the 4th triode, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, R4, the 4th resistance, R5, the 5th resistance, VCC, power supply.
Embodiment
Below in conjunction with embodiment and accompanying drawing, detailed description is further done to the utility model, but embodiment of the present utility model is not limited thereto.
Embodiment:
As shown in Figure 1, the driving circuit of speed probe, comprise signal input line 1, first triode T1, the second triode T2, the 3rd triode T3, the 4th triode T4, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, power supply VCC and output line 2, wherein, the first triode T1, the second triode T2 of the present embodiment, the 3rd triode T3 and the 4th triode T4 are NPN triode.First resistance R1 two ends are connected with signal input line 1 and the first triode T1 base stage respectively, second resistance R2 is as the pull-up resistor of the first triode T1, its two ends are connected with the collector of the first triode T1 and power supply VCC respectively, 3rd resistance R3 is as the pull down resistor of the first triode T1, its one end is connected with the emitter of the first triode T1, other end ground connection.4th resistance R4 is as the pull down resistor of the second triode T2, and its one end is connected with the emitter of the second triode T2, other end ground connection.The base stage of the second triode T2 of the present embodiment is connected with the collector of the first triode T1, and the base stage of the 3rd triode T3 is connected with the emitter of the second triode T2, and the second triode T2 is all connected with power supply VCC with the collector of the 3rd triode T3.The base stage of the 4th triode T4 of the present embodiment is connected with the emitter of the first triode T1, and collector is connected with the emitter of the 3rd triode T3, grounded emitter.The signal input line 2 of the present embodiment is connected on the circuit between the 3rd triode T3 emitter and the 4th triode T4 collector.
During the present embodiment application, when the 3rd triode T3 cut-off, the 4th triode T4 conducting, sensor exports as low level, load equivalent is two ends ground connection and the 5th resistance R5 be connected on output line 2 respectively by the present embodiment, a current direction the 4th triode T4 is had in 5th resistance R5, because now the 4th triode T4 degree of depth is saturated, output resistance only has tens ohm, and thus carrying load ability is strong.5th resistance R5 flows to the electric current of the 4th triode T4 for filling with electric current, and owing to always having some resistance values during the 4th triode T4 conducting, along with the increase of filling with electric current, the low-voltage on the 5th resistance R5 will improve.When the 3rd triode T3 conducting, the 4th triode T4 end, sensor exports as high level, and the electric current that the present embodiment exports is for drawing electric current.Now, the 3rd triode T3 is in conducting state, and between collector and emitter, resistance is very little, draws electric current just can reach very large.
As from the foregoing, the 3rd triode T3 of the present embodiment and the 4th triode T4 alternation are in saturation region.When exporting as high level, the complex pipe conducting that the second triode T2 and the 3rd triode T3 forms, form emitter voltage follower, its output resistance is very low; And when exporting as low level, the 4th triode T4 is in degree of depth state of saturation, output resistance is very low.Therefore, no matter export high level or low level, the present embodiment always presents low-resistance characteristic to external circuit, also improves the carrying load ability of the present embodiment.
Above content is the further description done the utility model in conjunction with concrete preferred implementation, can not assert that embodiment of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, not departing from other embodiments drawn under the technical solution of the utility model, all should be included in protection domain of the present utility model.
Claims (2)
1. the driving circuit of speed probe, it is characterized in that, comprise signal input line (1), first triode (T1), second triode (T2), 3rd triode (T3), 4th triode (T4), first resistance (R1), second resistance (R2), 3rd resistance (R3), 4th resistance (R4), power supply (VCC) and output line (2), described first resistance (R1) two ends are connected with signal input line (1) and the first triode (T1) base stage respectively, described second resistance (R2) two ends are connected with the collector of the first triode (T1) and power supply (VCC) respectively, described 3rd resistance (R3) one end is connected with the emitter of the first triode (T1), its other end ground connection, described 4th resistance (R4) one end is connected with the emitter of the second triode (T2), its other end ground connection, the base stage of described second triode (T2) is connected with the collector of the first triode (T1), the base stage of the 3rd triode (T3) is connected with the emitter of the second triode (T2), second triode (T2) is all connected with power supply (VCC) with the 3rd triode (T3) both collectors, the base stage of described 4th triode (T4), collector connects the emitter of the first triode (T1) and the emitter of the 3rd triode (T3) respectively, its grounded emitter, described signal input line (2) is connected on the circuit between the 3rd triode (T3) emitter and the 4th triode (T4) collector.
2. the driving circuit of speed probe according to claim 1, is characterized in that, described first triode (T1), the second triode (T2), the 3rd triode (T3) and the 4th triode (T4) are NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520492850.8U CN204731673U (en) | 2015-07-10 | 2015-07-10 | The driving circuit of speed probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520492850.8U CN204731673U (en) | 2015-07-10 | 2015-07-10 | The driving circuit of speed probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204731673U true CN204731673U (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520492850.8U Expired - Fee Related CN204731673U (en) | 2015-07-10 | 2015-07-10 | The driving circuit of speed probe |
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| Country | Link |
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| CN (1) | CN204731673U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112970183A (en) * | 2021-01-22 | 2021-06-15 | 深圳欣锐科技股份有限公司 | Bidirectional charging system control circuit and vehicle-mounted bidirectional charger |
-
2015
- 2015-07-10 CN CN201520492850.8U patent/CN204731673U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112970183A (en) * | 2021-01-22 | 2021-06-15 | 深圳欣锐科技股份有限公司 | Bidirectional charging system control circuit and vehicle-mounted bidirectional charger |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20190710 |