CN110601512A - Discrete high-side driving circuit system - Google Patents
Discrete high-side driving circuit system Download PDFInfo
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- CN110601512A CN110601512A CN201910905494.0A CN201910905494A CN110601512A CN 110601512 A CN110601512 A CN 110601512A CN 201910905494 A CN201910905494 A CN 201910905494A CN 110601512 A CN110601512 A CN 110601512A
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- resistor
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- switch tube
- switching tube
- discrete high
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- 230000005669 field effect Effects 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention relates to the technical field of high-side driving circuits, and particularly discloses a discrete high-side driving circuit system which comprises a control circuit, a driving circuit and a protection circuit, wherein the control circuit comprises a control signal input Vin, a voltage division resistor R1, a voltage division resistor R2, a current limiting resistor R3 and a switch tube Q1, the driving circuit comprises a switch tube Q3 and an anti-reverse diode D1, and the protection circuit comprises a switch tube Q2, an EMC reducing resistor R4 and a current limiting feedback resistor R5. The invention has lower cost, can effectively solve the problems of current drive and PCB area, can effectively realize the purpose of overcurrent protection/current-limiting protection, and is suitable for drivers with medium current capacity as driving capacity.
Description
Technical Field
The invention relates to the technical field of high-side driving circuits, in particular to a self-protection discrete high-side driving circuit system.
Background
In the industrial field, a system or a device often integrates various small functional actuators, and the number of the integrated actuators is large, so that the actuator driving circuit is realized: firstly, use polylith integrated chip to constitute its drive circuit, they can satisfy the drive requirement of executor completely, but to little function (the drive capacity is less than within 200mA for medium current ability) driver integrated number not enough in the current integrated chip, often compel some heavy current drive module parts in using this integrated chip for accomplishing its function, the purpose is in order to reduce integrated chip use number, but uses like this and can cause the cost to increase. Secondly, PMOSFET, NMOSFET or IGBT which are integrated by a chip manufacturer can meet the driving requirements of an actuator, the driving circuit is used as an output circuit and is necessary for the short-circuit protection/over-current protection/current limiting self-protection function, if the chip manufacturer integrates the function, the price is increased a lot, if the over-current protection/current limiting protection function is developed on the basis, the area of a PCB (printed circuit board) is a problem, the integration difficulty of a system is increased, and the structure of the system is relatively complex.
Disclosure of Invention
In view of the above, there is a need for a discrete high-side driving circuit system, which can effectively solve the problems of current driving and PCB area, and can effectively achieve the purpose of overcurrent protection/current limiting protection, and has a low overall cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a discrete high-side driving circuit system comprises a control circuit, a driving circuit and a protection circuit, wherein the control circuit comprises a control signal input Vin, a voltage division resistor R1, a voltage division resistor R2, a current limiting resistor R3 and a switch tube Q1, the driving circuit comprises a switch tube Q3 and an anti-reverse diode D1, and the protection circuit comprises a switch tube Q2, a reduced EMC resistor R4 and a current limiting feedback resistor R5;
in the control circuit, one end of the voltage dividing resistor R1 is connected with a control signal input Vin, the other end is respectively connected with one end of a voltage dividing resistor R2 and a control end of a switch tube Q1, the other end of the voltage-dividing resistor R2 and the second end of the switch tube Q1 are grounded in parallel, the first end of the switch tube Q1 is connected with one end of the current-limiting resistor R3, the other end of the current-limiting resistor R3 is respectively connected with the control end of the switching tube Q3 in the driving circuit and the first end of the switching tube Q2 in the protection circuit, the first end of the switch tube Q3 is connected with the anode of an anti-reverse diode D1, the cathode of the anti-reverse diode D1 is connected with an output load Vout, the second end of the switch tube Q2 is respectively connected with the power supply Vcc and one end of the current-limiting feedback resistor R5, the other end of the current-limiting feedback resistor R5 is connected with the second end of the switch tube Q3 and one end of the EMC reducing resistor R4 respectively, and the other end of the EMC reducing resistor R4 is connected with the control end of the switch tube Q2.
Preferably, the resistance values of the voltage dividing resistor R1 and the voltage dividing resistor R2 are the same.
Preferably, the anti-reverse diode D1 is a schottky diode.
Preferably, the resistance value of the current-limiting feedback resistor R5 is equal to the turn-on voltage Uon/current threshold of the switching tube Q2, wherein the current threshold is a current threshold of the discrete high-side driving circuit system.
Preferably, the switching tube Q1 is an NPN triode or a MOS field effect transistor, and the switching tube Q2 and the switching tube Q3 are both PNP triode or MOS field effect transistor.
Preferably, the switching tube Q1 is an NPN transistor, and the switching tube Q2 and the switching tube Q3 are both PNP transistors, and in this case, the base of the NPN transistor or the PNP transistor is the control terminal, the collector is the first terminal, and the emitter is the second terminal.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes the purposes of overcurrent protection and current-limiting protection through a high-side driving circuit consisting of a switching tube, a resistor and an anti-reverse diode, has simple and reliable circuit and lower cost compared with the prior circuit system and integrated chip, can effectively solve the problems of current driving and PCB area, and is suitable for small-function (the driving capability is less than 200mA and is medium current capability) drivers.
Drawings
Fig. 1 is a circuit diagram of a discrete high-side driving circuit system according to the present invention.
Description of the main elements
In the figure: the control circuit comprises a control signal input Vin, a voltage division resistor R1, a voltage division resistor R2, a current limiting resistor R3, a switch tube Q1, a switch tube Q3, an anti-reflection diode D1, a switch tube Q2, an EMC reducing resistor R4 and a current limiting feedback resistor R5.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, in a preferred embodiment of the present invention, a discrete high-side driving circuit system includes a control circuit, a driving circuit and a protection circuit, wherein the control circuit includes a control signal input Vin, a voltage dividing resistor R1, a voltage dividing resistor R2, a current limiting resistor R3 and a switch Q1, the driving circuit includes a switch Q3 and an anti-reverse diode D1, and the protection circuit includes a switch Q2, an EMC (electromagnetic compatibility) reducing resistor R4 and a current limiting feedback resistor R5.
In the control circuit, one end of the voltage dividing resistor R1 is connected with a control signal input Vin, the other end is respectively connected with one end of a voltage dividing resistor R2 and a control end of a switch tube Q1, the other end of the voltage-dividing resistor R2 and the second end of the switch tube Q1 are grounded in parallel, the first end of the switch tube Q1 is connected with one end of the current-limiting resistor R3, the other end of the current-limiting resistor R3 is respectively connected with the control end of the switching tube Q3 in the driving circuit and the first end of the switching tube Q2 in the protection circuit, the first end of the switch tube Q3 is connected with the anode of an anti-reverse diode D1, the cathode of the anti-reverse diode D1 is connected with an output load Vout, the second end of the switch tube Q2 is respectively connected with the power supply Vcc and one end of the current-limiting feedback resistor R5, the other end of the current-limiting feedback resistor R5 is connected with the second end of the switch tube Q3 and one end of the EMC reducing resistor R4 respectively, and the other end of the EMC reducing resistor R4 is connected with the control end of the switch tube Q2.
The circuit is arranged, so that the cost is lower, the problems of current drive and PCB area can be solved, and the purposes of overcurrent protection/current-limiting protection can be realized.
In the control circuit of the present invention, the switching tube Q1 is used to improve the driving capability of the controller, and the controller provides the control signal input Vin for the present invention, and the driving capability of the controller itself is weak; the voltage dividing resistor R1 and the voltage dividing resistor R2 are used for ensuring that the voltage of the control end of the switching tube Q1 is far larger than the starting voltage of the switching tube Q1, and the voltage dividing resistor R1 and the voltage dividing resistor R2 are generally integrated in the switching tube Q1, in the embodiment, the resistance values of the voltage dividing resistor R1 and the voltage dividing resistor R2 are the same, and the resistance values of the voltage dividing resistor R1 and the voltage dividing resistor R2 are both 2k omega-100 k omega, preferably 10k omega; the current limiting resistor R3 is configured to ensure that the control end of the switching tube Q3 can be normally pulled down to the ground when the driving output of the discrete high-side driving circuit system is in a normal state, and ensure that the control end of the switching tube Q3 can be normally pulled down to the power supply Vcc when the driving output is in an overcurrent state, so as to perform a current limiting protection function.
In the driving circuit of the present invention, the switching tube Q3 is an output device of the discrete high-side driving circuit system of the present invention, and in consideration of the heat dissipation problem and the PCB area of the switching tube Q3, in this embodiment, a switch with an output current less than 1A is selected as the output of the switching tube Q3; the anti-reverse diode D1 is used for supporting short circuit to the power supply Vcc and preventing damage to the switching tube Q3 under the condition that the external output is reversely connected, so as to achieve the purpose of short circuit protection.
In the protection circuit of the present invention, the switching tube Q2 functions as a self-protection switch; the EMC reducing resistor R4 is used to increase the miller effect time of the switching transistor Q2 during the opening process, so as to reduce the EMC of the entire circuit, and it should be noted that if the EMC of the entire circuit can meet the requirements, the EMC reducing resistor R4 may be omitted, at this time, the EMC reducing resistor R4 is short-circuited (that is, the EMC reducing resistor R4 is attached with 0ohm), in this embodiment, the resistance value range of the EMC reducing resistor R4 is 1k Ω -100k Ω, and is preferably 10k Ω; the current-limiting feedback resistor R5 is used for current detection and overcurrent protection of the discrete high-side driving circuit system, when the driving output current of the discrete high-side driving circuit system reaches the current threshold (less than or equal to 200mA) of the system, the voltage consumed by the current-limiting feedback resistor R5 is exactly equal to the turn-on voltage Uon of the switching tube Q2, and at this time, the switching tube Q2 is turned on, and the switching tube Q3 is turned off (i.e., the discrete high-side driving circuit system is turned off), so as to perform the output protection function of the discrete high-side driving circuit system, and therefore, the resistance value of the current-limiting feedback resistor R5 is equal to the turn-on voltage Uon/current threshold of the switching tube Q2, wherein the current threshold is the current threshold of the discrete high-side driving circuit system, and in this embodiment, the current-limiting range of the current-limiting feedback resistor R5 is 0.1 Ω -100 Ω, preferably 10 omega is taken to meet medium current capability.
Further, in the present invention, the switching tube Q1 is an NPN transistor or an MOS field effect transistor, preferably an NPN transistor is selected, and the switching tube Q2 and the switching tube Q3 are both PNP transistors or MOS field effect transistors, preferably PNP transistors, and at this time, the base of the NPN transistor or the PNP transistor is the above-mentioned control terminal, the collector is a first terminal, and the emitter is a second terminal. In this embodiment, the switching tube Q1 is an NPN transistor with a current of less than 100mA, the switching tube Q2 is a PNP transistor with a current of less than 100mA, and the switching tube Q3 is a PNP transistor with a current of 500 mA.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a discrete high limit drive circuit system, includes control circuit, drive circuit and protection circuit, its characterized in that: the control circuit comprises a control signal input Vin, a voltage division resistor R1, a voltage division resistor R2, a current limiting resistor R3 and a switch tube Q1, the drive circuit comprises a switch tube Q3 and an anti-reverse diode D1, and the protection circuit comprises a switch tube Q2, an EMC reducing resistor R4 and a current limiting feedback resistor R5;
in the control circuit, one end of the voltage dividing resistor R1 is connected with a control signal input Vin, the other end is respectively connected with one end of a voltage dividing resistor R2 and a control end of a switch tube Q1, the other end of the voltage-dividing resistor R2 and the second end of the switch tube Q1 are grounded in parallel, the first end of the switch tube Q1 is connected with one end of the current-limiting resistor R3, the other end of the current-limiting resistor R3 is respectively connected with the control end of the switching tube Q3 in the driving circuit and the first end of the switching tube Q2 in the protection circuit, the first end of the switch tube Q3 is connected with the anode of an anti-reverse diode D1, the cathode of the anti-reverse diode D1 is connected with an output load Vout, the second end of the switch tube Q2 is respectively connected with the power supply Vcc and one end of the current-limiting feedback resistor R5, the other end of the current-limiting feedback resistor R5 is connected with the second end of the switch tube Q3 and one end of the EMC reducing resistor R4 respectively, and the other end of the EMC reducing resistor R4 is connected with the control end of the switch tube Q2.
2. The discrete high-side driver circuitry of claim 1, wherein: the resistance values of the voltage dividing resistor R1 and the voltage dividing resistor R2 are the same.
3. The discrete high-side driver circuitry of claim 1, wherein: the anti-reverse diode D1 is a schottky diode.
4. The discrete high-side driver circuitry of claim 1, wherein: the resistance value of the current-limiting feedback resistor R5 is equal to the turn-on voltage Uon/current threshold of the switching tube Q2, wherein the current threshold is the current threshold of the discrete high-side driving circuit system.
5. The discrete high-side driver circuitry of claim 1, wherein: the switching tube Q1 is an NPN triode or a MOS field effect transistor, and the switching tube Q2 and the switching tube Q3 are both PNP triodes or MOS field effect transistors.
6. The discrete high-side driver circuitry of claim 5, wherein: the switching tube Q1 is an NPN transistor, the switching tube Q2 and the switching tube Q3 are both PNP transistors, and at this time, the base electrode of the NPN transistor or the PNP transistor is the control terminal, the collector electrode is the first terminal, and the emitter electrode is the second terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910905494.0A CN110601512A (en) | 2019-09-24 | 2019-09-24 | Discrete high-side driving circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910905494.0A CN110601512A (en) | 2019-09-24 | 2019-09-24 | Discrete high-side driving circuit system |
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| Publication Number | Publication Date |
|---|---|
| CN110601512A true CN110601512A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910905494.0A Pending CN110601512A (en) | 2019-09-24 | 2019-09-24 | Discrete high-side driving circuit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111105747A (en) * | 2019-12-30 | 2020-05-05 | 大峡谷照明***（苏州）股份有限公司 | Drive circuit and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0854573A2 (en) * | 1997-01-21 | 1998-07-22 | Ford Motor Company | Short circuit protection for high side driver |
| CN202841092U (en) * | 2012-08-07 | 2013-03-27 | 惠州市德赛西威汽车电子有限公司 | High-side switch output circuit with short-circuit protection function |
| CN204334538U (en) * | 2014-12-31 | 2015-05-13 | 北京经纬恒润科技有限公司 | A kind of small area analysis high-end drive circuit |
| CN210469110U (en) * | 2019-09-24 | 2020-05-05 | 广西新发展交通集团有限公司 | Discrete high-side driving circuit system |
-
2019
- 2019-09-24 CN CN201910905494.0A patent/CN110601512A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0854573A2 (en) * | 1997-01-21 | 1998-07-22 | Ford Motor Company | Short circuit protection for high side driver |
| CN202841092U (en) * | 2012-08-07 | 2013-03-27 | 惠州市德赛西威汽车电子有限公司 | High-side switch output circuit with short-circuit protection function |
| CN204334538U (en) * | 2014-12-31 | 2015-05-13 | 北京经纬恒润科技有限公司 | A kind of small area analysis high-end drive circuit |
| CN210469110U (en) * | 2019-09-24 | 2020-05-05 | 广西新发展交通集团有限公司 | Discrete high-side driving circuit system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111105747A (en) * | 2019-12-30 | 2020-05-05 | 大峡谷照明***（苏州）股份有限公司 | Drive circuit and display device |
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