CN202374353U - Television and motherboard power supply short-circuit detection circuit thereof - Google Patents
Television and motherboard power supply short-circuit detection circuit thereof Download PDFInfo
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- CN202374353U CN202374353U CN2011203813123U CN201120381312U CN202374353U CN 202374353 U CN202374353 U CN 202374353U CN 2011203813123 U CN2011203813123 U CN 2011203813123U CN 201120381312 U CN201120381312 U CN 201120381312U CN 202374353 U CN202374353 U CN 202374353U
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Abstract
The utility model belongs to the field of electronic circuit detection and provides a television and a motherboard power supply short-circuit detection circuit thereof. According to the utility model, by adoption of the motherboard power supply short-circuit detection circuit of the television, which consists of a short-circuit detection unit, a first switch unit and a second switch unit, when one of power supplies of a television motherboard is short-circuited, a short-circuit fault can be timely detected, and a short-circuit detection signal is generated to trigger a motherboard controller to perform corresponding motherboard circuit protection operation; when other power supplies in a circuit system are short-circuited, a main power supply of the motherboard can timely stop supplying power to the power supplies which are short-circuited, and circuit burnout is avoided; and under the condition of independent power supplying of a logic power supply of the motherboard controller, the motherboard controller can enter a standby state, and after the short-circuit fault is eliminated, the main power supply of the motherboard is controlled to be re-energized and started, so the aim of circuit protection is fulfilled.
Description
Technical field
The utility model belongs to electronic circuit detecting field, relates in particular to a kind of television set and motherboard power supply short-circuit detecting circuit thereof.
Background technology
At present; The motherboard circuit of television set all needs multiple power supplies to supply power, if wherein short circuit appears in one road power supply, then can make the whole TV SKD circuit can't operate as normal; And cause the components and parts temperature on the TV SKD too high; Even burn, there is the possibility of blast in especially big electric capacity, and then initiation fire.To above-mentioned TV SKD circuit existing problem when short circuit appears in power supply; Prior art provides a kind of power protecting circuit; This power protecting circuit matches through adopting switching diode and triode; Cut off the power circuit of all power supplys therein during one road power supply short circuit, and then realize protection motherboard circuit.Yet the power protecting circuit that prior art provides can cause the mainboard controller of television set can not obtain normal power supply when short circuit appears in power supply; Thereby it is unusual that the entire circuit system is occurred; When if exterior electrical components is short-circuited, can burns part of devices, and then damage circuit.
The utility model content
The purpose of the utility model is to provide a kind of TV SKD power supply short circuit testing circuit; When being intended to solve part power supply that prior art exists and short circuit occurring; Can't guarantee the normal power supply of TV SKD controller, and then make the problem that the mainboard controller can't operate as normal.
The utility model is to realize like this; A kind of TV SKD power supply short circuit testing circuit; Be connected with mainboard main power source, mainboard working power, mainboard standby power, mainboard controller and mainboard controller logic power supply, wherein, said mainboard main power source is connected with said mainboard working power and said mainboard standby power respectively; And be said mainboard working power and the power supply of said mainboard standby power, said TV SKD power supply short circuit testing circuit comprises:
First input end connects the output of said mainboard working power; The output of the said mainboard standby power of the second input termination; The output of the said mainboard main power source of power supply termination detects the short-circuit detecting unit whether said mainboard working power and said mainboard standby power short trouble occurs;
The output of control termination said short-circuit detecting unit, the output of the said mainboard main power source of power supply termination is exported first switch element of corresponding level signal according to the testing result of said short-circuit detecting unit;
The output of said first switch element of control termination; The output of the said mainboard controller logic of power supply termination power supply; The test side of the said mainboard controller of output termination, the level signal of exporting according to said first switch element is the second switch unit that said mainboard controller provides corresponding short-circuit detection signal.
Another purpose of the utility model also is to provide a kind of television set; Said television set comprises TV SKD power supply short circuit testing circuit; Said TV SKD power supply short circuit testing circuit is connected with mainboard main power source, mainboard working power, mainboard standby power, mainboard controller and mainboard controller logic power supply, and said TV SKD power supply short circuit testing circuit comprises:
First input end connects the output of said mainboard working power; The output of the said mainboard standby power of the second input termination; The output of the said mainboard main power source of power supply termination detects the short-circuit detecting unit whether said mainboard working power and said mainboard standby power short trouble occurs;
The output of control termination said short-circuit detecting unit, the output of the said mainboard main power source of power supply termination is exported first switch element of corresponding level signal according to the testing result of said short-circuit detecting unit;
The output of said first switch element of control termination; The output of the said mainboard controller logic of power supply termination power supply; The test side of the said mainboard controller of output termination, the level signal of exporting according to said first switch element is the second switch unit that said mainboard controller provides corresponding short-circuit detection signal.
In the utility model; Through the TV SKD power supply short circuit testing circuit that adopts said short-circuit detecting unit, said first switch element and said second switch unit to form, TV SKD wherein short circuit appears in one road power supply time, can in time detect short trouble; And generate short-circuit detection signal and trigger said mainboard controller and carry out corresponding motherboard circuit protection operation; When short circuit appearred in other power supplies in the Circuits System, said mainboard main power source can in time stop the power supply of failed because is supplied power, and avoids burning out circuit; And under the independently-powered situation of said mainboard controller logic power supply; Said mainboard controller can get into holding state, and the control main board main power source re-powers start after short trouble is eliminated, thereby reaches the purpose of protective circuit.
Description of drawings
Fig. 1 is the modular structure figure of the TV SKD power supply short circuit testing circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit figure of the TV SKD power supply short circuit testing circuit that provides of the utility model embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the modular structure of the TV SKD power supply short circuit testing circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
TV SKD power supply short circuit testing circuit 100 is connected with mainboard main power source 200, mainboard working power 300, mainboard standby power 400, mainboard controller 500 and mainboard controller logic power supply 600; Wherein, Mainboard main power source 200 is connected with mainboard working power 300 and mainboard standby power 400 respectively; And be mainboard working power 300 and 400 power supplies of mainboard standby power, said TV SKD power supply short circuit testing circuit 100 comprises:
First input end connects the output of said mainboard working power 300; The output of the said mainboard standby power 400 of the second input termination; The output of power supply termination mainboard main power source 200 detects the short-circuit detecting unit 101 whether mainboard working power 300 and mainboard standby power 400 short trouble occurs.
The output of control termination said short-circuit detecting unit 101, the output of power supply termination mainboard main power source 200 is exported first switch element 102 of corresponding level signal according to the testing result of short-circuit detecting unit 101.
The output of control termination first switch element 102; The output of power supply termination mainboard controller logic power supply 600; The test side of output termination mainboard controller 500, the level signal of exporting according to first switch element 102 is the second switch unit 103 that mainboard controller 500 provides corresponding short-circuit detection signal.
TV SKD power supply short circuit testing circuit 100 comprises that also one is connected in the current-limiting resistance R11 between the test side of output and mainboard controller 500 of second switch unit 103.
In the utility model embodiment; The control end of the signal termination mainboard main power source 200 of mainboard controller 500, the output voltage of mainboard main power source 200 is 12V, the output voltage of mainboard working power 300 is 5V; The output voltage of mainboard standby power 400 is 1.8V; And the unlatching of mainboard main power source 200 may command mainboard working powers 300 and mainboard standby power 400 and closing, and being respectively both power supplies, the output of mainboard controller logic power supply 600 is connected with the power end of mainboard controller 500; And being its power supply, the output voltage of mainboard controller logic power supply 600 is 3.3V.
Fig. 2 shows the exemplary circuit structure of the TV SKD power supply short circuit testing circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
As the utility model one embodiment, short-circuit detecting unit 101 comprises:
First resistance R 1, second resistance R 2, the first diode D1, the 3rd resistance R 3, the 4th resistance R 4, the second diode D2 and the 5th resistance R 5;
Particularly; First end of first resistance R 1 is the first input end of short-circuit detecting unit 101; Second end of first resistance R 1 is connected with first end of second resistance R 2 and the negative electrode of the first diode D1 simultaneously, the second end ground connection of second resistance R 2, and the anode of the first diode D1 is the output of short-circuit detecting unit 101; First end of the 3rd resistance R 3 is second input of short-circuit detecting unit 101; Second end of the 3rd resistance R 3 is connected with first end of the 4th resistance R 4 and the negative electrode of the second diode D2 simultaneously, the second end ground connection of the 4th resistance R 4, and the anode of the second diode D2 connects the anode of the first diode D1; The anode of first termination, the first diode D1 of the 5th resistance R 5, second end of the 5th resistance R 5 is the power end of short-circuit detecting unit 101.
As the utility model one embodiment, first switch element 102 comprises:
The 6th resistance R 6, first capacitor C 1, a NPN type triode Q1, the 7th resistance R 7 and the 8th resistance R 8;
First end of the 6th resistance R 6 is the control end of first switch element 102; Node between the base stage of first end of first capacitor C 1 and a NPN type triode Q1 is connected with second end of the 6th resistance R 6; The current collection of the one NPN type triode Q1 is the output of first switch element 102 very; The emitter of the one NPN type triode Q1 connects first end of the 7th resistance R 7; The equal ground connection of second end of second end of the 7th resistance R 7 and first capacitor C 1, first end of the 8th resistance R 8 is the power end of first switch element 102, second end of the 8th resistance R 8 is connected with the collector electrode of a NPN type triode Q1.
As the utility model one embodiment, second switch unit 103 comprises:
The 9th resistance R 9, second capacitor C 2, the 2nd NPN type triode Q2 and the tenth resistance R 10;
First end of the 9th resistance R 9 is the control end of second switch unit 103; Node between the base stage of first end of second capacitor C 2 and the 2nd NPN type triode Q2 is connected with second end of the 9th resistance R 9; The current collection of the 2nd NPN type triode Q2 is the output of second switch unit 103 very; The emitter of the 2nd NPN type triode Q2 and the equal ground connection of second end of second capacitor C 2; First end of the tenth resistance R 10 is the power end of second switch unit 103, and second end of the tenth resistance R 10 is connected with the collector electrode of the 2nd NPN type triode Q2.
In the utility model embodiment, mainboard controller 500 can be microprocessors such as single-chip microcomputer or arm processor in practical application.When the test side of mainboard controller 500 receives high level, judge that then each road power supply of mainboard is in proper working order, and keep original operating state; When the test side of mainboard controller 500 receives low level, then judge the power supply failed because of mainboard, send commands for controlling mainboard main power source 200 and turn-off each road power supply of mainboard, and get into holding state automatically.
Below in conjunction with operation principle TV SKD power supply short circuit testing circuit 100 is described further, details are as follows:
Under the situation of mainboard working power 300 and mainboard standby power 400 equal operate as normal; Mainboard main power source 200 is that a NPN type triode Q1 provides base voltage and collector voltage through the 5th resistance R 5 and the 6th resistance R 6 and the 8th resistance R 8 respectively; Make a NPN type triode Q1 work in the saturation conduction state; So the collector electrode output low level of a NPN type triode Q1 is ended the 2nd NPN type triode Q2.The 3.3V voltage of mainboard controller logic power supply 600 output is carried in the collector electrode of the 2nd NPN type triode Q2 after through the tenth resistance R 10 dividing potential drops; Thereby make second switch unit 103 output high level; This high level gets into the test side of mainboard controller 500 as short-circuit detection signal after through current-limiting resistance R11 current limliting; Mainboard controller 500 is judged that each road power supply of mainboard is no abnormal, and is kept original operating state after receiving this high level.
When mainboard working power 300 or mainboard standby power 400 were short-circuited, the cathode voltage of the first diode D1 or the second diode D2 diminished, and then first terminal voltage of the 5th resistance R 5 is diminished; Thereby the voltage that enters into a NPN type triode Q1 base stage through the 6th resistance R 6 is reduced; Then a NPN type triode Q1 ends, and promptly first switch element 102 is exported high level, and this high level is carried in the base stage of the 2nd NPN type triode Q2 through the 9th resistance R 9; Thereby make the 2nd NPN type triode Q2 be operated in the saturation conduction state; So the collector voltage of the 2nd NPN type triode Q2 reduces, then second switch unit 103 output low levels; This low level gets into the test side of mainboard controller 500 as short-circuit detection signal after through current-limiting resistance R11 current limliting; Mainboard controller 500 sends control command and makes mainboard main power source 200 turn-off mainboard working power 300 and mainboard standby power 400, and get into holding state automatically after receiving this low level; Thereby make whole TV SKD circuit when mainboard working power 300 or mainboard standby power 400 are short-circuited; Prevent that effectively TV SKD circuit temperature when mainboard working power 300 or mainboard standby power 400 are short-circuited is too high, even components and parts burn or situation on fire takes place, and can protect circuit to a certain extent.
In above-mentioned operation principle; Particularly; Under the situation of mainboard working power 300 and mainboard standby power 400 equal operate as normal; According to the side circuit design conditions, preferably, the voltage of the points of common connection of the voltage of the points of common connection of first resistance R 1 and second resistance R 2 and the 3rd resistance R 3 and the 4th resistance R 4 is all greater than 270mV.The resistance of the 7th resistance R 7 is between 200 Ω and 700 Ω, and the resistance of the 8th resistance R 8 is between 20K Ω and 50K Ω.
In above-mentioned operation principle; When mainboard working power 300 (perhaps the mainboard standby power 400) when being short-circuited; The first diode D1 (the perhaps second diode D2) can guarantee that the output voltage of mainboard standby power 400 (perhaps the mainboard working power 300) does not receive the influence of mainboard working power 300 (perhaps the mainboard standby power 400) failed because through its effect that oppositely ends; Sending control command up to mainboard controller 500 makes mainboard main power source 200 close other power supplys; At this moment; Mainboard controller logic power supply 600 is operate as normal still, and mainboard controller 500 can get into holding state, and control main board main power source 200 re-powers start after short trouble is eliminated.
The utility model embodiment also provides a kind of television set that comprises above-mentioned TV SKD power supply short circuit testing circuit.
In the utility model embodiment; Through the TV SKD power supply short circuit testing circuit 100 that adopts short-circuit detecting unit 101, first switch element 102 and second switch unit 103 to form, TV SKD wherein short circuit appears in one road power supply time, can in time detect short trouble; And the generation short-circuit detection signal triggers the corresponding motherboard circuit protection of mainboard controller 500 execution operation; When short circuit appearred in other power supplies in the Circuits System, mainboard main power source 200 can in time stop the power supply of failed because is supplied power, and avoids burning out circuit; And under the independently-powered situation of mainboard controller 500 logic powers; Mainboard controller 500 can get into holding state, and the control main board main power source re-powers start after short trouble is eliminated, thereby reaches the purpose of protective circuit.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. TV SKD power supply short circuit testing circuit; Be connected with mainboard main power source, mainboard working power, mainboard standby power, mainboard controller and mainboard controller logic power supply; Wherein, said mainboard main power source is connected with said mainboard working power and said mainboard standby power respectively, and is said mainboard working power and the power supply of said mainboard standby power; It is characterized in that said TV SKD power supply short circuit testing circuit comprises:
First input end connects the output of said mainboard working power; The output of the said mainboard standby power of the second input termination; The output of the said mainboard main power source of power supply termination detects the short-circuit detecting unit whether said mainboard working power and said mainboard standby power short trouble occurs;
The output of control termination said short-circuit detecting unit, the output of the said mainboard main power source of power supply termination is exported first switch element of corresponding level signal according to the testing result of said short-circuit detecting unit;
The output of said first switch element of control termination; The output of the said mainboard controller logic of power supply termination power supply; The test side of the said mainboard controller of output termination, the level signal of exporting according to said first switch element is the second switch unit that said mainboard controller provides corresponding short-circuit detection signal.
2. TV SKD power supply short circuit testing circuit as claimed in claim 1 is characterized in that, said short-circuit detecting unit comprises:
First resistance, second resistance, first diode, the 3rd resistance, the 4th resistance, second diode and the 5th resistance;
First end of said first resistance is the first input end of said short-circuit detecting unit; Second end of said first resistance is connected with first end of said second resistance and the negative electrode of said first diode simultaneously; The second end ground connection of said second resistance; The anode of said first diode is the output of said short-circuit detecting unit, and first end of said the 3rd resistance is second input of said short-circuit detecting unit, and second end of said the 3rd resistance is connected with first end of said the 4th resistance and the negative electrode of said second diode simultaneously; The second end ground connection of said the 4th resistance; The anode of said second diode is connected with the anode of said first diode, and first end of said the 5th resistance is connected with the anode of said first diode, and second end of said the 5th resistance is the power end of said short-circuit detecting unit.
3. according to claim 1 or claim 2 TV SKD power supply short circuit testing circuit is characterized in that said first switch element comprises:
The 6th resistance, first electric capacity, a NPN type triode, the 7th resistance and the 8th resistance;
First end of said the 6th resistance is the control end of said first switch element; Node between the base stage of first end of said first electric capacity and a said NPN type triode is connected with second end of said the 6th resistance; The output of very said first switch element of current collection of a said NPN type triode; The emitter of a said NPN type triode connects first end of said the 7th resistance; The equal ground connection of second end of second end of said the 7th resistance and said first electric capacity, first end of said the 8th resistance is the power end of said first switch element, second end of said the 8th resistance is connected with the collector electrode of a said NPN type triode.
4. TV SKD power supply short circuit testing circuit as claimed in claim 3 is characterized in that, said second switch unit comprises:
The 9th resistance, second electric capacity, the 2nd NPN type triode and the tenth resistance;
First end of said the 9th resistance is the control end of said second switch unit; Node between the base stage of first end of said second electric capacity and said the 2nd NPN type triode is connected with second end of said the 9th resistance; The output of the very said second switch of the current collection unit of said the 2nd NPN type triode; The equal ground connection of second end of the emitter of said the 2nd NPN type triode and said second electric capacity; First end of said the tenth resistance is the power end of said second switch unit, and second end of said the tenth resistance is connected with the collector electrode of said the 2nd NPN type triode.
5. TV SKD power supply short circuit testing circuit as claimed in claim 4; It is characterized in that said TV SKD power supply short circuit testing circuit comprises that also one is connected in the current-limiting resistance between the test side of output and said mainboard controller of said second switch unit.
6. television set; It is characterized in that; Said television set comprises TV SKD power supply short circuit testing circuit; Said TV SKD power supply short circuit testing circuit is connected with mainboard main power source, mainboard working power, mainboard standby power, mainboard controller and mainboard controller logic power supply, and wherein, said mainboard main power source is connected with said mainboard working power and said mainboard standby power respectively; And be said mainboard working power and the power supply of said mainboard standby power, said TV SKD power supply short circuit testing circuit comprises:
First input end connects the output of said mainboard working power; The output of the said mainboard standby power of the second input termination; The output of the said mainboard main power source of power supply termination detects the short-circuit detecting unit whether said mainboard working power and said mainboard standby power short trouble occurs;
The output of control termination said short-circuit detecting unit, the output of the said mainboard main power source of power supply termination is exported first switch element of corresponding level signal according to the testing result of said short-circuit detecting unit;
The output of said first switch element of control termination; The output of the said mainboard controller logic of power supply termination power supply; The test side of the said mainboard controller of output termination, the level signal of exporting according to said first switch element is the second switch unit that said mainboard controller provides corresponding short-circuit detection signal.
7. television set as claimed in claim 6 is characterized in that, said short-circuit detecting unit comprises:
First resistance, second resistance, first diode, the 3rd resistance, the 4th resistance, second diode and the 5th resistance;
First end of said first resistance is the first input end of said short-circuit detecting unit; Second end of said first resistance is connected with first end of said second resistance and the negative electrode of said first diode simultaneously; The second end ground connection of said second resistance; The anode of said first diode is the output of said short-circuit detecting unit, and first end of said the 3rd resistance is second input of said short-circuit detecting unit, and second end of said the 3rd resistance is connected with first end of said the 4th resistance and the negative electrode of said second diode simultaneously; The second end ground connection of said the 4th resistance; The anode of said second diode is connected with the anode of said first diode, and first end of said the 5th resistance is connected with the anode of said first diode, and second end of said the 5th resistance is the power end of said short-circuit detecting unit.
8. like claim 6 or 7 described television sets, it is characterized in that said first switch element comprises:
The 6th resistance, first electric capacity, a NPN type triode, the 7th resistance and the 8th resistance;
First end of said the 6th resistance is the control end of said first switch element; Node between the base stage of first end of said first electric capacity and a said NPN type triode is connected with second end of said the 6th resistance; The output of very said first switch element of current collection of a said NPN type triode; The emitter of a said NPN type triode connects first end of said the 7th resistance; The equal ground connection of second end of second end of said the 7th resistance and said first electric capacity, first end of said the 8th resistance is the power end of said first switch element, second end of said the 8th resistance is connected with the collector electrode of a said NPN type triode.
9. television set as claimed in claim 8 is characterized in that, said second switch unit comprises:
The 9th resistance, second electric capacity, the 2nd NPN type triode and the tenth resistance;
First end of said the 9th resistance is the control end of said second switch unit; Node between the base stage of first end of said second electric capacity and said the 2nd NPN type triode is connected with second end of said the 9th resistance; The output of the very said second switch of the current collection unit of said the 2nd NPN type triode; The equal ground connection of second end of the emitter of said the 2nd NPN type triode and said second electric capacity; First end of said the tenth resistance is the power end of said second switch unit, and second end of said the tenth resistance is connected with the collector electrode of said the 2nd NPN type triode.
10. television set as claimed in claim 9 is characterized in that, said TV SKD power supply short circuit testing circuit comprises that also one is connected in the current-limiting resistance between the test side of output and said mainboard controller of said second switch unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203813123U CN202374353U (en) | 2011-10-09 | 2011-10-09 | Television and motherboard power supply short-circuit detection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203813123U CN202374353U (en) | 2011-10-09 | 2011-10-09 | Television and motherboard power supply short-circuit detection circuit thereof |
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| Publication Number | Publication Date |
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| CN202374353U true CN202374353U (en) | 2012-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203813123U Expired - Lifetime CN202374353U (en) | 2011-10-09 | 2011-10-09 | Television and motherboard power supply short-circuit detection circuit thereof |
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| CN (1) | CN202374353U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103488228A (en) * | 2013-09-12 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN103488222A (en) * | 2013-09-06 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
-
2011
- 2011-10-09 CN CN2011203813123U patent/CN202374353U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103488222A (en) * | 2013-09-06 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN103488228A (en) * | 2013-09-12 | 2014-01-01 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN103488228B (en) * | 2013-09-12 | 2015-06-10 | 天脉聚源(北京)传媒科技有限公司 | Output voltage control circuit |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
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Granted publication date: 20120808 |
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