CN217335056U - Power output short-circuit protection circuit - Google Patents
Power output short-circuit protection circuit Download PDFInfo
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- CN217335056U CN217335056U CN202123425794.0U CN202123425794U CN217335056U CN 217335056 U CN217335056 U CN 217335056U CN 202123425794 U CN202123425794 U CN 202123425794U CN 217335056 U CN217335056 U CN 217335056U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a power output short-circuit protection circuit, this protection circuit concatenates on each way power output line, including P channel field effect transistor M1, resistance R1-R5, triode Q1, diode D1 and zener diode ZD1, back input voltage passes through R1 under normal condition, R2 drive triode makes the MOS pipe switch on completely, output voltage is close to input voltage, when the output takes place the short circuit, as long as output voltage Vo is less than the voltage of zener diode ZD1, the output just ends triode Q1 through diode D1, M1 also ends this moment, through cutting off the MOS pipe control circuit of establishing ties on output line promptly and shutting off, make the voltage of MOS pipe front end keep normal, power to multiplexed output, do not influence the normal output of each way of non-short circuit behind the short circuit.
Description
Technical Field
The utility model relates to a power field, more specifically relates to short-circuit protection of all kinds of switching power supply outputs.
Background
At present, most power supplies in the market are in a state of restarting or locking up after being electrified when output is short-circuited, and for a multi-output power supply, other non-short-circuit lines have no output or unstable output, so that equipment carried by corresponding lines cannot work normally.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide a power output short-circuit protection circuit. When the output is short-circuited, the control circuit of the MOS connected in series on the output line is cut off, so that the MOS is turned off, the voltage at the front end of the MOS tube is kept normal, and for a power supply with multiple outputs, the normal output of each non-short-circuited circuit is not influenced after short circuit.
The technical scheme of the utility model is that:
the utility model provides a power output short-circuit protection circuit, this protection circuit concatenates on each way power output line, including P channel field effect transistor M1, resistance R1-R5, triode Q1, diode D1 and zener diode ZD1, the protection circuit input mark as Vin, connect triode Q1 'S base behind resistance R1, R2 through establishing ties, and this input termination is respectively resistance R3, R4' S one end and P channel field effect transistor M1 'S source S, resistance R3' S another termination P channel field effect transistor M1 'S grid G and resistance R5' S one end, resistance R4 'S another termination P channel field effect transistor M1' S drain D and diode D1 'S negative pole, diode D1' S positive pole links to each other with resistance R1, R2 'S tie point, resistance R5' S another termination triode Q1 'S collecting electrode, triode Q1' S emitter ZD1 after concatenating, resistance R4 ground connection The junction between the drain D of the P-channel fet M1 and the cathode of the diode D1 serves as the output of the protection circuit and is denoted as Vo.
The utility model has the advantages that:
the utility model discloses a when the protection circuit used, when the output short circuit, through cutting off the MOS pipe control circuit of establishing ties on this output line, make it turn-off, and the voltage of the front end of MOS pipe keeps normal, to the power of multichannel output, does not influence each way normal output of non-short circuit behind the short circuit.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings, wherein like reference numerals generally represent like parts throughout the exemplary embodiments.
Fig. 1 shows a circuit diagram of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
The utility model provides a power output short-circuit protection circuit, this protection circuit includes P channel field effect transistor M1, resistance R1-R5, triode Q1, diode D1 and zener diode ZD1, the protection circuit input end mark as Vin, through the resistance R1 of series connection, connect behind R2 triode Q1 ' S base, and this input termination respectively resistance R3, the one end of R4 and the source S of P channel field effect transistor M1, the other termination of resistance R3 is P channel field effect transistor M1 ' S grid G and the one end of resistance R5, the other termination of resistance R4 is P channel field effect transistor M1 ' S drain D and diode D1 ' S negative pole, diode D1 ' S positive pole links to each other with the connection point of resistance R1, R2, the other termination of resistance R5 is triode Q1 ' S collector, triode Q1 ' S emitter concatenates behind zener diode ZD1 ground connection, the negative pole of the drain resistance R4, P channel field effect transistor M1D 4625D is as the output terminal 5959 1 of protection circuit, denoted as Vo.
Under the normal state, the rear Vin passes through R1 and R2, and drives a triode Q1 to enable a MOS transistor of a P channel to be completely conducted, and the output voltage Vo is completely close to Vin. When the output end is short-circuited or the output line is short-circuited at a long distance, the output end can cut off the triode Q1 through the diode D1 and the M1 at this time as long as the output voltage Vo is lower than the voltage of the voltage regulator tube ZD 1.
The output with capacitive load can be charged through R4, when the output Vo reaches a certain value, Q1 is conducted, M1 is conducted, and normal output is maintained.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (1)
1. A power output short-circuit protection circuit is characterized in that the protection circuit is connected in series with each power output line and comprises a P-channel field effect transistor M1, resistors R1-R5, a triode Q1, a diode D1 and a zener diode ZD1, the input end of the protection circuit is marked as Vin, the protection circuit is connected with the base of a triode Q1 through resistors R1 and R2 which are connected in series, the input end of the protection circuit is connected with one end of resistors R3 and R4 and the source S of the P-channel field effect transistor M1 respectively, the other end of the resistor R3 is connected with the grid G of the P-channel field effect transistor M1 and one end of a resistor R5, the other end of the resistor R4 is connected with the drain D of a P-channel field effect transistor M1 and the negative electrode of a diode D1, the positive electrode of the diode D1 is connected with the connection points of resistors R1 and R2, the other end of the resistor R5 is connected with the collector of a triode Q5, the emitter of the triode Q5 is connected in series with the zener diode ZD 5 and then grounded, and the resistor R5 is connected with the zener diode ZD 5, The junction between the drain D of the P-channel fet M1 and the cathode of the diode D1 serves as the output of the protection circuit and is denoted as Vo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123425794.0U CN217335056U (en) | 2021-12-31 | 2021-12-31 | Power output short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123425794.0U CN217335056U (en) | 2021-12-31 | 2021-12-31 | Power output short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217335056U true CN217335056U (en) | 2022-08-30 |
Family
ID=82991767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123425794.0U Active CN217335056U (en) | 2021-12-31 | 2021-12-31 | Power output short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217335056U (en) |
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2021
- 2021-12-31 CN CN202123425794.0U patent/CN217335056U/en active Active
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