CN209488696U - Short-circuit protection circuit and short circuit protection system - Google Patents
Short-circuit protection circuit and short circuit protection system Download PDFInfo
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- CN209488696U CN209488696U CN201822001928.8U CN201822001928U CN209488696U CN 209488696 U CN209488696 U CN 209488696U CN 201822001928 U CN201822001928 U CN 201822001928U CN 209488696 U CN209488696 U CN 209488696U
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- 239000004065 semiconductor Substances 0.000 claims description 33
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- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 206010037660 Pyrexia Diseases 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000005476 soldering Methods 0.000 description 1
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Abstract
The utility model discloses a kind of short-circuit protection circuit and short circuit protection system; including short circuit protection module, voltage output module and TV motherboard; the output voltage of the voltage output module is exported to TV motherboard; the short circuit protection module carries out the voltage output for turning off the voltage output module according to the control signal of the TV motherboard；The short circuit protection module includes short-circuit protection unit and first switch unit; the input terminal of the short-circuit protection unit is electrically connected with the signal output end of the TV motherboard; the output end of the road protection location is electrically connected with the input terminal of the first switch unit, and the output end of the first switch unit is electrically connected with the voltage output module.The utility model is a kind of short-circuit protection circuit and short circuit protection system; by the way that short circuit protection module is arranged, the switching tube of 12V can be effectively protected when output end is extremely short-circuit; make the control of its temperature in reasonable specified value, it is excessively high not generate abnormal temperature rise.
Description
Technical field
The utility model relates to television power circuit fields, more particularly to a kind of short-circuit protection circuit and short-circuit protection
System.
Background technique
Use for current TV set power, when output end abnormal conditions occurs and short circuit occurs, power panel should
Into automatic protection state, each element above can not be abnormal because of the fever of such state, makes hot-spot, causes on fire
Danger.
Each master control IC on the market has the function of short-circuit protection.But it but cannot be very to the switch metal-oxide-semiconductor of output
Good protect, and will cause during output short-circuit, and output switch metal-oxide-semiconductor fever is abnormal, in addition can by melts soldering tin,
It causes local temperature excessively high, phenomenon on fire occurs.
Utility model content
The purpose of the utility model is to overcome shortcoming in the prior art, a kind of short-circuit protection circuit and short circuit are provided
Protection system can make when output end exception, the switching tube of effective protection 12V, close the control of switching tube temperature
It is excessively high not generate abnormal temperature rise for the specified value of reason.
The purpose of this utility model is achieved through the following technical solutions:
A kind of short-circuit protection circuit, comprising: short circuit protection module, voltage output module and TV motherboard, the voltage are defeated
The output voltage of module is exported to TV motherboard out, the short circuit protection module according to the control signal of the TV motherboard,
Turn off the voltage output of the voltage output module；
The short circuit protection module includes short-circuit protection unit and first switch unit, the input of the short-circuit protection unit
End is electrically connected with the signal output end of the TV motherboard, the output end of the road protection location and the first switch unit
Input terminal electrical connection, the output end of the first switch unit are electrically connected with the voltage output module.
The short-circuit protection unit includes diode D9 and capacitor C11, the diode D9 in one of the embodiments,
Anode be electrically connected with the signal output end of the TV motherboard, the cathode of the diode D9 respectively with the first switch list
The first end electrical connection of the input terminal and the capacitor C11 of member, the second end ground connection of the capacitor C11.
The short-circuit protection unit further includes resistance R24 and resistance R25, the resistance R25 in one of the embodiments,
First end be electrically connected with the cathode of the diode D9, the second end of the resistance R25 respectively with the resistance R24 first
The input terminal of end and the first switch unit is electrically connected.
The first switch unit includes triode Q3, capacitor C22 and resistance R9 in one of the embodiments, described
The base stage of triode Q3 is electrically connected with the output end of the short-circuit protection unit, and the collector of the triode Q3 is through the electricity
It is electrically connected after resistance R9 with the voltage output module, the emitter ground connection of the triode Q3, the both ends difference of the capacitor C22
It is connect with the emitter of the base stage of the triode Q3 and the triode Q3.
The voltage output module includes second switch unit and output filter unit, institute in one of the embodiments,
The input terminal for stating second switch unit is electrically connected with the output end of the first switch unit, the output of the second switch unit
It holds and is electrically connected with the input terminal of the output filter unit, the output end of the output filter unit is electrically connected with the TV motherboard
It connects.
The second switch unit includes capacitor C14, capacitor C15, resistance R33 and MOS in one of the embodiments,
Pipe Q2, the pole G of the metal-oxide-semiconductor Q2 are electrically connected with the output end of the first switch unit, the pole the S ground connection of the metal-oxide-semiconductor Q2, institute
State output end of the pole D of metal-oxide-semiconductor Q2 as second switch unit, the both ends of the capacitor C14 G with the metal-oxide-semiconductor Q2 respectively
Pole and the pole D of the metal-oxide-semiconductor Q2 electrical connection, the both ends of the capacitor C15 respectively with the pole G of the metal-oxide-semiconductor Q2 and the MOS
The pole S of pipe Q2 is electrically connected, and the both ends of the resistance R33 are extremely electric with the S of the pole G of the metal-oxide-semiconductor Q2 and the metal-oxide-semiconductor Q2 respectively
Connection.
The output filter unit includes capacitor C13, resistance R21 and resistance R22 in one of the embodiments, described
One end of capacitor C13 is electrically connected with the pole D of the metal-oxide-semiconductor Q2, the other end ground connection of the capacitor C13, and the two of the resistance R21
It holds and is connected in parallel with the both ends of the capacitor C13, the both ends of the resistance R22 and the both ends of the capacitor C13 are connected in parallel.
The voltage of the voltage output module output is 12V in one of the embodiments,.
The capacitor C11 is electrolytic capacitor in one of the embodiments,.
The utility model also provides a kind of short circuit protection system, including above-described short-circuit protection circuit.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is that a kind of short-circuit protection circuit and short circuit protection system can be with by the way that short circuit protection module is arranged
When output end is extremely short-circuit, it can be effectively protected the switching tube of 12V, make the control of its temperature in reasonable specified value, do not produce
Raw abnormal temperature rise is excessively high.And it is possible to which it is excessively high to there is switching tube temperature when avoiding because there is short circuit or excessive electric current
The problem of, so protection circuit plate and avoid generate fire.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the short-circuit protection circuit of the utility model and the circuit diagram of short circuit protection system.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Referring to Fig. 1, a kind of short-circuit protection circuit, comprising: short circuit protection module, voltage output module and TV motherboard,
The output voltage of the voltage output module is exported to TV motherboard, and the short circuit protection module is according to the TV motherboard
Signal is controlled, the voltage output for turning off the voltage output module is carried out；The short circuit protection module includes short-circuit protection unit
And first switch unit, the input terminal of the short-circuit protection unit is electrically connected with the signal output end of the TV motherboard, described
The output end of road protection location is electrically connected with the input terminal of the first switch unit, the output end of the first switch unit with
The voltage output module electrical connection.The voltage of the voltage output module output is 12V.
It should be noted that the short-circuit protection unit includes diode D9 and capacitor C11, the sun of the diode D9
Pole is electrically connected with the signal output end of the TV motherboard, the cathode of the diode D9 respectively with the first switch unit
The electrical connection of the first end of input terminal and the capacitor C11, the second end ground connection of the capacitor C11.Preferably, the capacitor C11
For electrolytic capacitor.
It should be noted that the short-circuit protection unit further includes the of resistance R24 and resistance R25, the resistance R25
One end is electrically connected with the cathode of the diode D9, the second end of the resistance R25 respectively with the first end of the resistance R24 and
The input terminal of the first switch unit is electrically connected.
It should be noted that the first switch unit includes triode Q3, capacitor C22 and resistance R9, the triode
The base stage of Q3 is electrically connected with the output end of the short-circuit protection unit, the collector of the triode Q3 after the resistance R9 with
Voltage output module electrical connection, the emitter ground connection of the triode Q3, the both ends of the capacitor C22 are respectively with described three
The base stage of pole pipe Q3 is connected with the emitter of the triode Q3.
It should be noted that the voltage output module include second switch unit and output filter unit, described second
The input terminal of switch unit is electrically connected with the output end of the first switch unit, the output end of the second switch unit and institute
The input terminal electrical connection of output filter unit is stated, the output end of the output filter unit is electrically connected with the TV motherboard.
It should be noted that the second switch unit includes capacitor C14, capacitor C15, resistance R33 and metal-oxide-semiconductor Q2, institute
The pole G for stating metal-oxide-semiconductor Q2 is electrically connected with the output end of the first switch unit, the pole the S ground connection of the metal-oxide-semiconductor Q2, the metal-oxide-semiconductor
Output end of the pole D of Q2 as second switch unit, the both ends of the capacitor C14 respectively with the pole G of the metal-oxide-semiconductor Q2 and described
The pole D of metal-oxide-semiconductor Q2 is electrically connected, the both ends of the capacitor C15 pole S with the pole G of the metal-oxide-semiconductor Q2 and the MOS pipe Q2 respectively
Electrical connection, the both ends of the resistance R33 are electrically connected with the pole S of the pole G of the metal-oxide-semiconductor Q2 and the metal-oxide-semiconductor Q2 respectively.
It should be noted that the output filter unit includes capacitor C13, resistance R21 and resistance R22, the capacitor C13
One end be electrically connected with the pole D of the metal-oxide-semiconductor Q2, the other end of capacitor C13 ground connection, the both ends of the resistance R21 and institute
The both ends for stating capacitor C13 are connected in parallel, and the both ends of the resistance R22 and the both ends of the capacitor C13 are connected in parallel.
When work, when 12V output end is short-circuited, 3.3V powers off CPU on TV SKD, is provided by CPU without output
PWON signal cut, at this time due to fully charged on electrolytic capacitor C11, so triode Q3 is unanimously connected, metal-oxide-semiconductor Q2 also can one
Straight in the conductive state, until the voltage on electrolytic capacitor is lower than the Vbe junction voltage of triode, triode can just end.
Traditional design scheme does not have diode D9, electrolytic capacitor C11 circuit, the primary PWM control when output short-circuit
IC U1 shutdown, then opens at once again, repeatedly, will lead to metal-oxide-semiconductor Q2 and also frequently switch on, due to short-circuit condition at this time, electricity
Stream is very big, so will lead to the raising of Q2 temperaturing lifting abnormality, or even can melt scolding tin, generate danger on fire.And the application can be kept away
Exempt from problems occur.
There is this partial circuit, so that it may which the on-off times for reducing Q2 effectively reduce his temperature.Ensure his temperature
It is in a reasonable specified value.
When the utility model solves output short-circuit, the element on protection power source plate will not be damaged, and will not generate
The abnormal of the temperature of part increases.After short-circuit abnormal releasing, circuit be can work normally.
The utility model also provides a kind of short circuit protection system, including above-described short-circuit protection circuit.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is that a kind of short-circuit protection circuit and short circuit protection system can be with by the way that short circuit protection module is arranged
When output end is extremely short-circuit, it can be effectively protected the switching tube of 12V, make the control of its temperature in reasonable specified value, do not produce
Raw abnormal temperature rise is excessively high.And it is possible to which it is excessively high to there is switching tube temperature when avoiding because there is short circuit or excessive electric current
The problem of, so protection circuit plate and avoid generate fire.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of short-circuit protection circuit characterized by comprising short circuit protection module, voltage output module and TV motherboard, institute
The output voltage for stating voltage output module is exported to TV motherboard, and the short circuit protection module is according to the control of the TV motherboard
Signal processed carries out the voltage output for turning off the voltage output module；
The short circuit protection module includes short-circuit protection unit and first switch unit, the input terminal of the short-circuit protection unit with
The signal output end of the TV motherboard is electrically connected, the input of the output end of the road protection location and the first switch unit
End electrical connection, the output end of the first switch unit are electrically connected with the voltage output module.
2. short-circuit protection circuit according to claim 1, which is characterized in that the short-circuit protection unit includes diode D9
It is electrically connected with the anode of capacitor C11, the diode D9 with the signal output end of the TV motherboard, the yin of the diode D9
Pole is electrically connected with the first end of the input terminal of the first switch unit and the capacitor C11 respectively, and the second of the capacitor C11
End ground connection.
3. short-circuit protection circuit according to claim 2, which is characterized in that the short-circuit protection unit further includes resistance
R24 and resistance R25, the first end of the resistance R25 are electrically connected with the cathode of the diode D9, and the second of the resistance R25
End is electrically connected with the input terminal of the first end of the resistance R24 and the first switch unit respectively.
4. short-circuit protection circuit according to claim 1, which is characterized in that the first switch unit includes triode
Q3, capacitor C22 and resistance R9, the base stage of the triode Q3 are electrically connected with the output end of the short-circuit protection unit, and described three
The collector of pole pipe Q3 is electrically connected after the resistance R9 with the voltage output module, and the emitter of the triode Q3 connects
Ground, the both ends of the capacitor C22 are connect with the emitter of the base stage of the triode Q3 and the triode Q3 respectively.
5. short-circuit protection circuit according to claim 1, which is characterized in that the voltage output module includes second switch
Unit and output filter unit, the input terminal of the second switch unit are electrically connected with the output end of the first switch unit,
The output end of the second switch unit is electrically connected with the input terminal of the output filter unit, described to export the defeated of filter unit
Outlet is electrically connected with the TV motherboard.
6. short-circuit protection circuit according to claim 5, which is characterized in that the second switch unit include capacitor C14,
Capacitor C15, resistance R33 and metal-oxide-semiconductor Q2, the pole G of the metal-oxide-semiconductor Q2 are electrically connected with the output end of the first switch unit, institute
The pole S for stating metal-oxide-semiconductor Q2 is grounded, output end of the pole D of the MOS pipe Q2 as second switch unit, and the two of the capacitor C14
End be electrically connected respectively with the pole D of the pole G of the metal-oxide-semiconductor Q2 and the metal-oxide-semiconductor Q2, the both ends of the capacitor C15 respectively with it is described
The pole G of metal-oxide-semiconductor Q2 and the electrical connection of the pole S of the metal-oxide-semiconductor Q2, the both ends of the resistance R33 pole G with the metal-oxide-semiconductor Q2 respectively
It is electrically connected with the pole S of the metal-oxide-semiconductor Q2.
7. short-circuit protection circuit according to claim 6, which is characterized in that the output filter unit include capacitor C13,
Resistance R21 and resistance R22, one end of the capacitor C13 are electrically connected with the pole D of the metal-oxide-semiconductor Q2, and the capacitor C13's is another
End ground connection, the both ends of the resistance R21 and the both ends of the capacitor C13 are connected in parallel, the both ends of the resistance R22 and the electricity
The both ends for holding C13 are connected in parallel.
8. short-circuit protection circuit according to claim 1, which is characterized in that the voltage of voltage output module output is
12V。
9. short-circuit protection circuit according to claim 2, which is characterized in that the capacitor C11 is electrolytic capacitor.
10. a kind of short circuit protection system, which is characterized in that including the electricity of short-circuit protection described in any one of claim 1~9
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822001928.8U CN209488696U (en) | 2018-11-30 | 2018-11-30 | Short-circuit protection circuit and short circuit protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822001928.8U CN209488696U (en) | 2018-11-30 | 2018-11-30 | Short-circuit protection circuit and short circuit protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209488696U true CN209488696U (en) | 2019-10-11 |
Family
ID=68117442
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822001928.8U Expired - Fee Related CN209488696U (en) | 2018-11-30 | 2018-11-30 | Short-circuit protection circuit and short circuit protection system |
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| Country | Link |
|---|---|
| CN (1) | CN209488696U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510958A (en) * | 2018-11-30 | 2019-03-22 | 惠州华科电器有限公司 | Short-circuit protection circuit and short circuit protection system |
-
2018
- 2018-11-30 CN CN201822001928.8U patent/CN209488696U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510958A (en) * | 2018-11-30 | 2019-03-22 | 惠州华科电器有限公司 | Short-circuit protection circuit and short circuit protection system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191011 |
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| CF01 | Termination of patent right due to non-payment of annual fee |