CN111193244A - Direct current power supply output circuit protection circuit - Google Patents
Direct current power supply output circuit protection circuit Download PDFInfo
- Publication number
- CN111193244A CN111193244A CN201811352450.1A CN201811352450A CN111193244A CN 111193244 A CN111193244 A CN 111193244A CN 201811352450 A CN201811352450 A CN 201811352450A CN 111193244 A CN111193244 A CN 111193244A
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- Prior art keywords
- power supply
- resistor
- circuit
- triode
- supply output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
A protection circuit of a direct current power supply output circuit comprises a control signal end, a power supply input circuit, a power supply control circuit and a diode D1, wherein the input end of the power supply input circuit is connected with the control signal end to turn on or turn off power supply according to a control signal; the power supply control circuit is connected with the power supply input circuit to turn on or turn off the power supply output; the cathode of the diode D1 is connected with the power supply output end of the power supply control circuit, and the anode is connected with the power supply input circuit; when the power supply output end is short-circuited to the ground, the power supply input circuit turns off power supply, and the power supply control circuit turns off power supply output. The invention can realize the short-circuit protection of output to the power supply and the ground without losing the precision of the output power supply, has simple circuit structure, is easy to realize, and can meet the power supply requirements of some high-precision sensors.
Description
Technical Field
The invention relates to the field of short-circuit protection circuits, in particular to a protection circuit of a direct-current power supply output circuit.
Background
With the vigorous development of vehicle automatic driving technology, the number of sensors on the vehicle is more and more. The sensor has higher precision requirement on the power supply, and the LDO is generally adopted for power supply. In order to avoid power supply damage caused by wrong insertion of a power supply interface in the installation process, the design of a vehicle-mounted electronic circuit requires that an output port of a power supply has a short-circuit protection function, and short circuits to other power supplies and the ground are protected.
In order to realize protection, a special protection chip or a discrete device can be used for construction, the cost of the special IC is high, the discrete device is used for protecting a power supply and the ground, the circuit is complex, or the cost is the loss of the power supply output precision.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provides a direct current power supply output circuit protection circuit which is simple in circuit structure, easy to implement and free from reducing the precision of an output power supply.
The invention adopts the following technical scheme:
a kind of direct current power supply output circuit protective circuit, characterized by that: the power supply circuit comprises a control signal end, a power supply input circuit, a power supply control circuit and a diode D1, wherein the input end of the power supply input circuit is connected with the control signal end so as to turn on or turn off power supply according to a control signal; the power supply control circuit is connected with the power supply input circuit to turn on or turn off the power supply output; the cathode of the diode D1 is connected with the power supply output end of the power supply control circuit, and the anode is connected with the power supply input circuit; when the power supply output end is short-circuited to the ground, the power supply input circuit turns off power supply, and the power supply control circuit turns off power supply output.
Preferably, the power input circuit comprises a power supply VCC, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a MOS transistor Q1 and a triode Q3; one end of the resistor R1 is connected with a power supply VCC and the source electrode of the MOS tube Q1, and the other end is connected with the grid electrode of the MOS tube Q1 and the collector electrode of the triode Q3; the base electrode of the triode Q3 is connected with one end of a resistor R2 and one end of a resistor R3; the other end of the resistor R2 is grounded with an emitting electrode of the triode Q3; the other end of the resistor R3 is connected with the positive connection of one end of a resistor R4 and the capacitor D1, and the other end of the resistor R4 is connected with the control signal end.
Preferably, the MOS transistor Q1 is an enhancement NMOS transistor, and the transistor Q3 is an NPN transistor.
Preferably, the power supply control circuit comprises a MOS transistor Q2, a triode Q4, a resistor R5, a resistor R6 and a resistor R7; the drain electrode of the MOS transistor Q2 is connected with the power input circuit, and the grid electrode of the MOS transistor Q2 is connected with one end of a resistor R5 and the collector electrode of a triode Q4; the other end of the resistor R5 is connected with the source electrode of the MOS transistor Q2 and one end of the resistor R6 and is used as the power supply output end; the other end of the resistor R6 is connected with one end of a resistor R7 and the base electrode of a triode Q4; the other end of the resistor R7 and the emitter of the triode Q4 are both grounded.
Preferably, the MOS transistor Q2 is an enhancement NMOS transistor, and the transistor Q4 is an NPN transistor.
Preferably, the power supply device further comprises a protection circuit, the protection circuit is connected with the power supply control circuit, and when the power supply output end is in short circuit with an external high-voltage power supply, the power supply control circuit closes the power supply output.
Preferably, the protection circuit comprises a resistor R8, a resistor R9 and a transistor Q5, wherein one end of the resistor R8 is connected with the power supply output end, and the other end of the resistor R8 is connected with one end of a resistor R9 and a base of the transistor Q5; the other end of the resistor R9 is grounded with the emitter of the triode Q5; the collector of the transistor Q5 is connected with the power supply control circuit.
Preferably, the transistor Q5 is an NPN transistor.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
the circuit provided by the invention is provided with the power supply input circuit, the power supply control circuit and the like, can realize the output short-circuit protection of the power supply and the ground short-circuit protection without losing the precision of the output power supply, has a simple circuit structure, is easy to realize, and can meet the power supply requirements of some high-precision sensors.
The circuit is provided with the protection circuit, when the power supply output end is short-circuited to an external power supply, if the external power supply is larger than an internal power supply VCC, the power supply output is controlled to be closed, the internal power supply is disconnected with the external high-voltage power supply, the protection effect is achieved, and the circuit is restored to a normal state until the external high-voltage power supply disappears.
Drawings
FIG. 1 is a circuit diagram of the present invention.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 1, a protection circuit for a dc power output circuit includes a control signal terminal, a power input circuit, a power supply control circuit, a diode D1, a protection circuit, and the like. The input end of the power input circuit is connected with the control signal end and used for turning on or turning off power supply according to the control signal. The power supply comprises a power supply VCC, a resistor R1, a resistor R2, a resistor R3, a resistor R4, an MOS transistor Q1 and a triode Q3; one end of the resistor R1 is connected with a power supply VCC and the source electrode of the MOS tube Q1, and the other end is connected with the grid electrode of the MOS tube Q1 and the collector electrode of the triode Q3; the base electrode of the triode Q3 is connected with one end of a resistor R2 and one end of a resistor R3; the other end of the resistor R2 is grounded with an emitting electrode of the triode Q3; the other end of the resistor R3 is connected with the positive connection of one end of a resistor R4 and the capacitor D1, and the other end of the resistor R4 is connected with a control signal end.
The power supply control circuit is connected with the power supply input circuit and used for turning on or turning off the power supply output. The device comprises an MOS transistor Q2, a triode Q4, a resistor R5, a resistor R6 and a resistor R7; the drain electrode of the MOS transistor Q2 is connected with the drain electrode of the MOS transistor Q1, and the grid electrode of the MOS transistor Q2 is connected with one end of a resistor R5 and the collector electrode of a triode Q4; the other end of the resistor R5 is connected with the source electrode of the MOS transistor Q2 and one end of the resistor R6, and is used as a power supply output end to be connected with the cathode of the diode D1; the other end of the resistor R6 is connected with one end of a resistor R7 and the base electrode of a triode Q4; the other end of the resistor R7 and the emitter of the triode Q4 are both grounded.
During normal operation, a control signal is input through the resistor R4, the triode Q3 is switched on through the voltage division of the resistor R2, the resistor R3 and the resistor R4, one end of the resistor R1 is connected with the power VCC, and the other end of the resistor R1 is grounded, so that the gate voltage of the MOS transistor Q1 is pulled low, and the MOS transistor Q1 is switched on. The voltage is output to the S-pole of the MOS transistor Q2 through the body diode of the MOS transistor Q2, and the transistor Q4 is turned on through the voltage division of the resistor R6 and the resistor R7. One end of the resistor R5 is connected with a power supply, and the other end is grounded, so that the gate voltage of the MOS tube Q2 is reduced, the MOS tube Q2 is conducted, and the voltage without loss of external output precision is provided for an external sensor.
When the supply output is shorted to ground, the potential between resistor R3 and resistor R4 is clamped at a level less than 0.3V due to the clamping action of diode D1, causing transistor Q3 to turn off. The same voltage at the two ends of the resistor R1 is used to cut off the MOS transistor Q1, the output is 0, the triode Q4 is cut off, and the same voltage at the two ends of the resistor R5 is used to cut off the MOS transistor Q2. The power supply output end is kept turned off until the external short circuit disappears, and the circuit returns to a normal state. Wherein, the resistor R4 plays a role of current limiting, and avoids the damage of the drive port due to overcurrent.
The invention is also provided with a protection circuit, the protection circuit comprises a resistor R8, a resistor R9 and a triode Q5, one end of the resistor R8 is connected with the power supply output end, and the other end of the resistor R8 is connected with one end of a resistor R9 and the base electrode of the triode Q5; the other end of the resistor R9 is grounded with the emitter of the triode Q5; the collector of the transistor Q5 is connected to the power supply control circuit.
When the power supply output end short-circuits external power supply, if external power supply is greater than power VCC, in order to avoid the power damage, the value of adjustment resistance R8 and resistance R9 can set up when the power of short circuit is greater than a certain value, and triode Q5 switches on, and then triode Q4's B utmost point level is 0 for triode Q4 ends. When the voltage across the resistor R5 is the same, the MOS transistor Q2 is turned off, i.e., the power supply control circuit turns off the power supply output. The internal power supply is disconnected with the external high-voltage power supply, so that the protection effect is achieved. And after the external high-voltage power supply disappears, the circuit is recovered to a normal state.
The MOS transistor Q1 is an enhanced NMOS transistor, and the triode Q3 is an NPN triode. The MOS transistor Q2 is an enhanced NMOS transistor, and the transistor Q4 is an NPN transistor. The transistor Q5 is an NPN type transistor. D1 is a general purpose diode; the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 are universal resistors. The invention realizes the short-circuit protection of the output to the power supply and the ground without losing the precision of the output power supply.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (8)
1. A kind of direct current power supply output circuit protective circuit, characterized by that: the power supply circuit comprises a control signal end, a power supply input circuit, a power supply control circuit and a diode D1, wherein the input end of the power supply input circuit is connected with the control signal end so as to turn on or turn off power supply according to a control signal; the power supply control circuit is connected with the power supply input circuit to turn on or turn off the power supply output; the cathode of the diode D1 is connected with the power supply output end of the power supply control circuit, and the anode is connected with the power supply input circuit; when the power supply output end is short-circuited to the ground, the power supply input circuit turns off power supply, and the power supply control circuit turns off power supply output.
2. A dc power supply output circuit protection circuit as defined in claim 1, wherein: the power input circuit comprises a power supply VCC, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a MOS transistor Q1 and a triode Q3; one end of the resistor R1 is connected with a power supply VCC and the source electrode of the MOS tube Q1, and the other end is connected with the grid electrode of the MOS tube Q1 and the collector electrode of the triode Q3; the base electrode of the triode Q3 is connected with one end of a resistor R2 and one end of a resistor R3; the other end of the resistor R2 is grounded with an emitting electrode of the triode Q3; the other end of the resistor R3 is connected with the positive connection of one end of a resistor R4 and the capacitor D1, and the other end of the resistor R4 is connected with the control signal end.
3. A dc power supply output circuit protection circuit as defined in claim 2, wherein: the MOS transistor Q1 is an enhanced NMOS transistor, and the triode Q3 is an NPN triode.
4. A dc power supply output circuit protection circuit as defined in claim 1, wherein: the power supply control circuit comprises a MOS transistor Q2, a triode Q4, a resistor R5, a resistor R6 and a resistor R7; the drain electrode of the MOS transistor Q2 is connected with the power input circuit, and the grid electrode of the MOS transistor Q2 is connected with one end of a resistor R5 and the collector electrode of a triode Q4; the other end of the resistor R5 is connected with the source electrode of the MOS transistor Q2 and one end of the resistor R6 and is used as the power supply output end; the other end of the resistor R6 is connected with one end of a resistor R7 and the base electrode of a triode Q4; the other end of the resistor R7 and the emitter of the triode Q4 are both grounded.
5. A dc power supply output circuit protection circuit as defined in claim 4, wherein: the MOS transistor Q2 is an enhanced NMOS transistor, and the triode Q4 is an NPN triode.
6. A dc power supply output circuit protection circuit as defined in claim 1, wherein: the protection circuit is connected with the power supply control circuit, and when the power supply output end is in short circuit with an external high-voltage power supply, the power supply control circuit closes the power supply output.
7. A dc power supply output circuit protection circuit as defined in claim 6, wherein: the protection circuit comprises a resistor R8, a resistor R9 and a triode Q5, wherein one end of the resistor R8 is connected with the power supply output end, and the other end of the resistor R8 is connected with one end of a resistor R9 and the base electrode of the triode Q5; the other end of the resistor R9 is grounded with the emitter of the triode Q5; the collector of the transistor Q5 is connected with the power supply control circuit.
8. A dc power supply output circuit protection circuit as defined in claim 7, wherein: the triode Q5 is an NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811352450.1A CN111193244A (en) | 2018-11-14 | 2018-11-14 | Direct current power supply output circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811352450.1A CN111193244A (en) | 2018-11-14 | 2018-11-14 | Direct current power supply output circuit protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN111193244A true CN111193244A (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811352450.1A Pending CN111193244A (en) | 2018-11-14 | 2018-11-14 | Direct current power supply output circuit protection circuit |
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| CN (1) | CN111193244A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| CN204144917U (en) * | 2014-09-29 | 2015-02-04 | 上海斐讯数据通信技术有限公司 | A kind of overvoltage crowbar |
| CN104426119A (en) * | 2013-08-26 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Power output protection circuit |
| US20170374720A1 (en) * | 2016-06-24 | 2017-12-28 | CI Holdings C.V. | Power supply with microcontroller for circuit protection |
| CN108599123A (en) * | 2018-01-18 | 2018-09-28 | 深圳创维－Rgb电子有限公司 | The short-circuit protection circuit and television set of power switch |
-
2018
- 2018-11-14 CN CN201811352450.1A patent/CN111193244A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| CN104426119A (en) * | 2013-08-26 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Power output protection circuit |
| CN204144917U (en) * | 2014-09-29 | 2015-02-04 | 上海斐讯数据通信技术有限公司 | A kind of overvoltage crowbar |
| US20170374720A1 (en) * | 2016-06-24 | 2017-12-28 | CI Holdings C.V. | Power supply with microcontroller for circuit protection |
| CN108599123A (en) * | 2018-01-18 | 2018-09-28 | 深圳创维－Rgb电子有限公司 | The short-circuit protection circuit and television set of power switch |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200522 |
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| RJ01 | Rejection of invention patent application after publication |