CN106533423B - Pulse interface circuit - Google Patents
Pulse interface circuit Download PDFInfo
- Publication number
- CN106533423B CN106533423B CN201610839804.XA CN201610839804A CN106533423B CN 106533423 B CN106533423 B CN 106533423B CN 201610839804 A CN201610839804 A CN 201610839804A CN 106533423 B CN106533423 B CN 106533423B
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- China
- Prior art keywords
- resistor
- branch
- switching tube
- interface circuit
- control module
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- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a pulse interface circuit, which comprises a comparison control module, a measurement branch and a voltage division branch, wherein one end of the measurement branch is connected in parallel with the voltage division branch and then is used for connecting an output signal of a current sensor, and the other end of the measurement branch is grounded; the measuring branch circuit comprises a first resistor and a switching tube connected in series with the first resistor, the voltage dividing branch circuit comprises a second resistor and a third resistor connected in series with the second resistor, and the output end of the comparison control module is connected with the control end of the switching tube. According to the invention, the switching tube is driven by the operational amplifier, the current signal detected by the sensor is converted into the voltage signal to be detected through the low-power resistor, so that the signal detection is realized, the overvoltage protection function is realized, the interface circuit cannot generate too high heat, and the safety of the interface circuit is ensured.
Description
Technical Field
The invention relates to a pulse interface circuit, and belongs to the technical field of power electronics.
Background
In the prior art, the rotation speed sensor is generally current type, the signal detection circuit is shown in fig. 1, generally, a series resistor is required for detecting the signal output by the rotation speed sensor, and the current output by the rotation speed sensor is very small, so that the resistance value of the series resistor to be detected cannot be very large in order to avoid the flooding of the transmitted signal due to the noise, and finally, the current signal is converted into a measurable voltage signal. In the detection circuit for the vehicle, the circuit cannot be damaged under the condition of short circuit of a power supply, so that the resistor to be detected needs to be increased in power to protect the detection circuit, therefore, the resistor to be detected of the rotating speed sensor needs to be a high-power resistor with small resistance value, but the high-power resistor has the defect of high heat, the ambient temperature around the high-power resistor is increased, the interface circuit is disadvantageous, the high-power resistor is large in size and is inconvenient to integrate in a circuit board, and wiring difficulty is increased when the circuit board is processed.
Disclosure of Invention
The invention aims to provide a pulse interface circuit which is used for solving the problems of high detection resistance power and high heating of the existing interface circuit.
In order to solve the technical problems, the invention provides a pulse interface circuit which comprises a comparison control module, a measuring branch and a voltage dividing branch, wherein one end of the measuring branch is connected with the output end of a current sensor in parallel, and the other end of the measuring branch is grounded; the measuring branch circuit comprises a first resistor and a switching tube connected in series with the first resistor, wherein the switching tube comprises three pins, namely a control end and two connecting ends, one end of the first resistor is used for being connected with an output signal of the current sensor, and the other end of the first resistor is connected with a comparison input end of the comparison control module; the voltage dividing branch circuit comprises a second resistor and a third resistor connected in series with the second resistor, wherein two ends of the second resistor are used for connecting an output signal of the current sensor and a reference input end of the comparison control module; and the output end of the comparison control module is connected with the control end of the switching tube.
Further, the voltage division branch circuit comprises a voltage stabilizing diode, the positive electrode of the voltage stabilizing diode is connected with the reference input end of the comparison control module, and the negative electrode of the voltage stabilizing diode is used for being connected with the output end of the current sensor.
Further, the switch tube is a triode or a MOS tube.
Further, the comparison control module comprises an operational amplifier.
The beneficial effects of the invention are as follows: the invention provides a pulse interface circuit which is simple in principle, and the current signal detected by a sensor is converted into a voltage signal to be detected through a low-power resistor by driving a switching tube through an operational amplifier, so that the signal detection is realized, the overvoltage protection function is realized, the interface circuit cannot generate too high heat, and the safety of the interface circuit is ensured.
Drawings
FIG. 1 is a signal detection circuit of a rotational speed sensor;
Fig. 2 is a schematic diagram of a pulse interface circuit of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
An embodiment of a pulse interface circuit of the present invention:
The pulse interface circuit of the invention is shown in figure 2, and comprises a comparison control module, a measuring branch and a voltage dividing branch, wherein one end of the measuring branch and one end of the voltage dividing branch are connected in parallel and then are used for connecting an output signal of a current sensor, and the other end of the measuring branch and the voltage dividing branch are grounded. In the figure, the current sensor is a rotating speed sensor S1 for a vehicle, the comparison control module comprises an operational amplifier U1, the measurement branch comprises a first resistor R1 and a triode Q1 which are connected in series, wherein the first resistor R1 is connected with the output end of the rotating speed sensor S1, the emitter of the triode Q1 is grounded, the collector is connected with the comparison input end of the operational amplifier U1, the base is connected with the output end of the rotating speed sensor S1, the voltage division branch comprises a second resistor R2 and a third resistor R3, the second resistor R2 is connected with the output end of the rotating speed sensor S1, one end of the third resistor R3 is grounded, and the other end of the third resistor R3 is connected with the reference input end of the operational amplifier U1.
The signal transmission module further comprises a voltage stabilizing diode D1, wherein the positive electrode of the voltage stabilizing diode D1 is connected with the reference input end of the operational amplifier U1, and the negative electrode of the voltage stabilizing diode D1 is connected with the output end of the rotating speed sensor S1.
The pulse interface circuit provided by the invention has the working process that: as shown in fig. 2, the rotation speed sensor S1 outputs a current pulse signal, the triode Q1 is in an off state, the measuring branch is disconnected, the current signal is divided by the resistors R2 and R3 in the dividing branch and converted into a voltage signal, the serial connection point of the resistors R2 and R3 of the dividing branch is connected with the reference input end of the operational amplifier U1, and the divided voltage generated on the third resistor R3 is the reference voltage signal on the reference input end of the operational amplifier U1. On the other hand, because the measuring branch circuit is broken, the voltage in the cut-off state of the triode Q1 is the voltage signal on the comparison input end of the operational amplifier U1, at the moment, the voltage signal on the comparison input end and the voltage signal on the reference input end are compared through the comparison control module U1, when the voltage in the cut-off state of the triode Q1 is larger than the partial voltage on the resistor R3, the operational amplifier U1 outputs high level, and the triode base is excited, so that the triode Q1 is conducted and is in an amplifying state.
The triode Q1 is conducted by the measuring branch in an amplifying state, so that the voltage division ratio of the triode Q1 and the resistor R1 is equal to the voltage division ratio of the resistor R3 and the resistor R2, wherein the resistor R2 and the resistor R3 are adjusting resistors, the resistance values are large, the resistance values of the resistor R1, the resistor R2 and the resistor R3 are all selected in advance so as to meet the output requirement of the sensor S1, and at the moment, the signal output by the sensor S1 can be detected only by measuring the voltage at the two ends of the resistor R1.
If the sensor is short-circuited or the circuit is connected with the power supply by mistake, the voltage applied to the voltage stabilizing diode D1 reaches the breakdown condition of the diode, so that the diode D1 is broken down and conducted, the reference input end of the operational amplifier U1 is connected with the short-circuit power supply, the reference voltage of the input end is higher than the voltage of the comparison input end of the operational amplifier U1, the operational amplifier U1 outputs low level, the triode Q1 is in a cut-off state, the measuring branch circuit is disconnected, and the overvoltage protection function of the interface circuit is realized.
In the case where the switching tube described in the above embodiment is a triode, the switching tube may also be a MOS tube.
In the case where the comparison control module described in the above embodiment is an operational amplifier, the comparison control module may also be another circuit having a comparison function.
Claims (5)
1. A pulse interface circuit, comprising: the device comprises a comparison control module, a measurement branch and a voltage division branch, wherein one end of the measurement branch is connected with the voltage division branch in parallel and then is used for connecting the output end of a current sensor, and the other end of the measurement branch is grounded; the measuring branch circuit comprises a first resistor and a switching tube connected in series with the first resistor, the switching tube comprises three pins, namely a control end and two connecting ends, one end of the first resistor is used for being connected with an output signal of the current sensor, the other end of the first resistor is connected with one connecting end of the switching tube, and a series point of the first resistor and the switching tube is connected with a comparison input end of the comparison control module; the voltage dividing branch circuit comprises a second resistor and a third resistor connected in series with the second resistor, wherein one end of the second resistor is used for being connected with an output signal of the current sensor, and a series point of the second resistor and the third resistor is connected with a reference input end of the comparison control module; the output end of the comparison control module is connected with the control end of the switching tube;
And setting the voltage division ratio of the second resistor and the third resistor to be equal to the voltage division ratio of the first resistor and the switching tube when the switching tube is conducted.
2. The pulse interface circuit of claim 1, wherein the voltage dividing branch comprises a zener diode, an anode of the zener diode is connected to a reference input terminal of the comparison control module, and a cathode of the zener diode is connected to an output terminal of the current sensor.
3. The pulse interface circuit according to claim 1 or 2, wherein the switching tube is a triode or a MOS tube.
4. The pulse interface circuit of claim 1 or 2, wherein the comparison control module comprises an operational amplifier.
5. A pulse interface circuit as defined in claim 3, wherein the comparison control module comprises an operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610839804.XA CN106533423B (en) | 2016-09-21 | 2016-09-21 | Pulse interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610839804.XA CN106533423B (en) | 2016-09-21 | 2016-09-21 | Pulse interface circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106533423A CN106533423A (en) | 2017-03-22 |
| CN106533423B true CN106533423B (en) | 2024-04-19 |
Family
ID=58343929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610839804.XA Active CN106533423B (en) | 2016-09-21 | 2016-09-21 | Pulse interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106533423B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603308A (en) * | 1994-11-04 | 1997-02-18 | Nippondenso Co., Ltd. | IGBT driving circuit and ignition device |
| JP2006020441A (en) * | 2004-07-02 | 2006-01-19 | Yasuhiro Sugimoto | Dc/dc converter |
| CN1825761A (en) * | 2005-02-21 | 2006-08-30 | 矢崎总业株式会社 | Overcurrent detecting device |
| JP2006236392A (en) * | 2006-06-01 | 2006-09-07 | Ricoh Co Ltd | Voltage generation system, voltage generation circuit, voltage regulator and portable terminal using them |
| CN202217486U (en) * | 2011-07-20 | 2012-05-09 | 青岛海信电器股份有限公司 | Protection circuit, backlight module and liquid crystal display (LCD) device |
| CN105182138A (en) * | 2015-09-28 | 2015-12-23 | 国网甘肃省电力公司 | Power inductor element inductance and saturation current measurement circuit |
| CN206164501U (en) * | 2016-09-21 | 2017-05-10 | 郑州宇通客车股份有限公司 | Pulse interface circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010239832A (en) * | 2009-03-31 | 2010-10-21 | Panasonic Corp | Current limiting circuit |
-
2016
- 2016-09-21 CN CN201610839804.XA patent/CN106533423B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603308A (en) * | 1994-11-04 | 1997-02-18 | Nippondenso Co., Ltd. | IGBT driving circuit and ignition device |
| JP2006020441A (en) * | 2004-07-02 | 2006-01-19 | Yasuhiro Sugimoto | Dc/dc converter |
| CN1825761A (en) * | 2005-02-21 | 2006-08-30 | 矢崎总业株式会社 | Overcurrent detecting device |
| JP2006236392A (en) * | 2006-06-01 | 2006-09-07 | Ricoh Co Ltd | Voltage generation system, voltage generation circuit, voltage regulator and portable terminal using them |
| CN202217486U (en) * | 2011-07-20 | 2012-05-09 | 青岛海信电器股份有限公司 | Protection circuit, backlight module and liquid crystal display (LCD) device |
| CN105182138A (en) * | 2015-09-28 | 2015-12-23 | 国网甘肃省电力公司 | Power inductor element inductance and saturation current measurement circuit |
| CN206164501U (en) * | 2016-09-21 | 2017-05-10 | 郑州宇通客车股份有限公司 | Pulse interface circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106533423A (en) | 2017-03-22 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. Country or region before: China |
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| GR01 | Patent grant |