CN207117164U - The power protecting circuit and display device of a kind of display device - Google Patents
The power protecting circuit and display device of a kind of display device Download PDFInfo
- Publication number
- CN207117164U CN207117164U CN201721050515.8U CN201721050515U CN207117164U CN 207117164 U CN207117164 U CN 207117164U CN 201721050515 U CN201721050515 U CN 201721050515U CN 207117164 U CN207117164 U CN 207117164U
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- display device
- constant current
- output unit
- switch element
- circuit
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Abstract
The utility model discloses in a kind of power protecting circuit of display device and display device; the power protecting circuit of the display device includes switch element and output unit; during status pin input high level signal to the switch element of the constant current chip; the switching means conductive simultaneously exports low level signal to output unit; the output unit is not turned on, and the power supply latching circuit does not work；During status pin input low level signal to the switch element of the constant current chip, the switch element cut-off, reference voltage pin input voltage to the switch element of constant current chip makes switch element export high level signal to output unit, the output unit conducting, the power supply latching circuit work and locked power supply.The utility model thoroughly realizes backlight portion module lamp bar, the safety of device by the protection of power end, prevents the too high caused risk of the damage of module lamp bar and temperature during metal-oxide-semiconductor open-grid.
Description
Technical field
Constant current Qu Donglingyu is the utility model is related to, the power protecting circuit of more particularly to a kind of display device and display are set
It is standby.
Background technology
The constant current topology matched at present with LED television backlight module has following several：1）BOOST boosting modes；2）BUCK
Decompression mode；3）Power supply exports " direct-drive type ".Each of which constant current topology has its merits and demerits, will according to screen body specification
Ask, in design suitable topological structure need to be selected matching.Wherein BUCK constant-current circuits are because of its succinct circuit form, height
The features such as efficiency and relatively low cost, it is widely used in LED backlight power supply.But BUCK constant-current circuits are because of the electricity of itself
Road limits, and when constant current chip scheme is used cooperatively, there is also some defects, such as part lamp bar open circuit, metal-oxide-semiconductor short circuit and afterflow
Fault etc., it can not all be directly realized by the safety of lamp bar protection or device.
Thus prior art could be improved and improve.
Utility model content
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of power supply of display device
Protection circuit and display device, the protection of power end is triggered by additional protection circuit, whole system is driven work in constant current
Make the protected mode in safety when exception or failure.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of power protecting circuit of display device, while constant current chip and power supply latching circuit are connected, the display is set
The first input end of standby power protecting circuit connects the status pin of the constant current chip, the power protection of the display device
Second input of circuit connects the reference voltage pin of the constant current chip, the power protecting circuit of the display device it is defeated
Go out end and connect the power supply latching circuit；
The power protecting circuit of the display device includes switch element and output unit, and the state of the constant current chip is drawn
During pin input high level signal to the switch element, the switching means conductive simultaneously exports low level signal to output unit,
The output unit is not turned on, and the power supply latching circuit does not work；The status pin input low level letter of the constant current chip
During number to the switch element, switch element cut-off, the reference voltage pin input voltage of constant current chip to switch element
Make switch element export high level signal to output unit, the output unit conducting, the power supply latching circuit to work and lock
Dead power supply.
In the power protecting circuit of described display device, the power protecting circuit of the display device also includes being used to prolong
When turn on the Delayed conducting unit of the output unit, the switch element passes through the Delayed conducting unit and connects the output
Unit.
In the power protecting circuit of described display device, the switch element includes first resistor, second resistance, the 3rd
Resistance, the first electric capacity and triode, one end of the first resistor connect the status pin of the constant current chip, first electricity
The other end of resistance connects one end, one end of second resistance and the base stage of triode of first electric capacity, first electric capacity
The other end and the other end of second resistance are all connected with the emitter stage of the triode, prolong described in the colelctor electrode connection of the triode
When onunit, connect also by the 3rd resistor reference voltage pin of the constant current chip.
In the power protecting circuit of described display device, the Delayed conducting unit includes the 4th resistance and the second electricity
Hold, one end of the 4th resistance connects the colelctor electrode of the triode, connects the constant current core also by the 3rd resistor
The reference voltage pin of piece, the other end of the 4th resistance by the second capacity earth, also connect the output unit.
In the power protecting circuit of described display device, the output unit includes the 3rd electric capacity, diode and the 5th
Resistance, the positive pole of the diode connect the other end of the 4th resistance, also by the 3rd capacity earth, two pole
The negative pole of pipe connects the power supply latching circuit by the 5th resistance.
In the power protecting circuit of described display device, the triode is NPN type triode.
A kind of display device, include the power protecting circuit of display device as described above.
Compared to prior art, in the power protecting circuit and display device of display device provided by the utility model, institute
Stating the power protecting circuit of display device includes switch element and output unit, the high electricity of status pin input of the constant current chip
During ordinary mail number to the switch element, the switching means conductive simultaneously exports low level signal to output unit, the output list
Member is not turned on, and the power supply latching circuit does not work；The status pin input low level signal of the constant current chip is opened to described
When closing unit, the switch element cut-off, reference voltage pin input voltage to the switch element of constant current chip makes switch element
High level signal is exported to output unit, the output unit conducting, the power supply latching circuit work and locked power supply.This reality
With the new status pin function by using constant current chip, pass through power protecting circuit may send out BUCK constant currents part
Raw unusual condition passes to power unit, comes thorough to realize backlight portion module lamp bar, device by the protection of power end
Safety, prevent the too high caused risk of the damage of module lamp bar and temperature during metal-oxide-semiconductor open-grid.
Brief description of the drawings
Fig. 1 is the structured flowchart of the power protecting circuit of display device provided by the utility model.
Fig. 2 is the circuit theory diagrams of the power protecting circuit of display device provided by the utility model.
Embodiment
The utility model provides a kind of power protecting circuit and display device of display device, to make mesh of the present utility model
, technical scheme and effect it is clearer, clear and definite, the embodiment that develops simultaneously referring to the drawings to the utility model further specifically
It is bright.It should be appreciated that specific embodiment described herein is not used to limit this practicality newly only to explain the utility model
Type.
Referring to Fig. 1, the power protecting circuit 1 of display device provided by the utility model, while connect constant current chip U1
With power supply latching circuit 2, the display device power protecting circuit 1 application with BUCK constant-current circuits, preferred embodiment
In, the constant current chip U1 uses model OZ562A chip, has status pin（STATUS pins）Draw with reference voltage
Pin（FB pins）, certainly in other embodiments, the constant current chip U1 can also use other models to realize that this practicality is new
The constant current chip of type function, the utility model are not construed as limiting to this, the power supply latching circuit 2 be used for module lamp bar damage or
Locked power end during metal-oxide-semiconductor open-grid, make the locked protection of power supply, so as to realize the safety of lamp bar protection or device, the electricity
It is available circuit from lock circuit, will not be repeated here.
When it is implemented, the power protecting circuit of the display device has first input end, the second input and output
End, the first input end of the power protecting circuit 1 of the display device connects the status pin of the constant current chip U1, described aobvious
Show that the second input of the power protecting circuit 1 of equipment connects the reference voltage pin of the constant current chip U1, the display is set
The output end of standby power protecting circuit 1 connects the power supply latching circuit 2, in constant current chip U1 normal works, its state
Pin is high level, and when the damage of module lamp bar or metal-oxide-semiconductor open-grid, constant current chip U1 status pin is overturn by high level
For low level, when module lamp bar is normal or metal-oxide-semiconductor normal work, the status pin output high level of the constant current chip U1 is extremely
The power protecting circuit 1 of display device, the power protecting circuit 1 of the display device export low level, the power supply self-locking electricity made
Road 2 is failure to actuate, and further makes subsequent conditioning circuit normal work, when module lamp bar damage or metal-oxide-semiconductor open-grid, the perseverance
The status pin for flowing chip U1 exports low level to the power protecting circuit 1 of display device, the reference electricity of the constant current chip U1
Pin input voltage is pressed to the power protecting circuit 1 of display device, makes the output end output of the power protecting circuit 1 of display device
High level, so that the trigger action of power supply latching circuit 2, further realize the safety of lamp bar protection or device.
Please continue to refer to Fig. 1, the power protecting circuit 1 of the display device includes switch element 11 and output unit 12,
The switch element 11 connects the status pin and reference voltage pin of the constant current chip U1 simultaneously, and the switch element 11 is also
Connect the output unit 12.
When it is implemented, when the status pin input high level signal of the constant current chip U1 is to the switch element 11
When, the switch element 11 turns on and exports low level signal to output unit 12, the output unit and is not turned on, the power supply
Latching circuit 2 does not work；It is described during status pin input low level signal to the switch element 11 of the constant current chip U1
Switch element 11 ends, and constant current chip U1 reference voltage pin input voltage to switch element 11 makes switch element 11 export height
Level signal is to output unit 12, and the output unit conducting, the power supply latching circuit 2 works and protection power source.
The utility model by using constant current chip status pin function, by power protecting circuit by BUCK constant currents portion
The unusual condition that may occur divided passes to power unit, and thoroughly backlight portion module is realized by the protection of power end
Lamp bar, the safety of device, prevent the too high caused risk of the damage of module lamp bar and temperature during metal-oxide-semiconductor open-grid.
Please continue to refer to Fig. 1, in preferred embodiment, the power protecting circuit 1 of the display device also includes being used to prolong
When turn on the Delayed conducting unit 13 of the output unit 12, the switch element 11 is connected by the Delayed conducting unit 13
The output unit 12, the Delayed conducting unit 13 can output unit 12 described in Delayed conducting, make output unit 12 can be pre-
The protection of lamp bar is realized in the time known.
Please continue to refer to Fig. 1 and Fig. 2, the switch element 11 includes first resistor R1, second resistance R2,3rd resistor
R3, the first electric capacity C1 and triode Q1, constant current chip U1 status pin are given by the first resistor R1 and second resistance R2
The triode Q1 provides base bias voltage, and the 3rd resistor R3 is pull-up resistor, and the triode Q1 is used as switch, root
The varying level inputted according to constant current chip U1 status pin, triode Q1 colelctor electrode exports different level, preferable real
Apply in example, the triode Q1 is NPN type triode, and the first electric capacity C1 is filter capacitor.
When it is implemented, one end connection constant current chip U1 of first resistor R1 status pin, described first
The resistance R1 other end connects one end, second resistance R2 one end and the triode Q1 base stage of the first electric capacity C1, described
The first electric capacity C1 other end and the second resistance R2 other end are all connected with the emitter stage of the triode Q1, the triode Q1
Colelctor electrode connect the Delayed conducting unit 13, electric also by the reference of the 3rd resistor R3 connections constant current chip U1
Press pin.
Specifically, in constant current chip U1 normal works, constant current chip U1 status pin is high level, triode Q1
Conducting, triode Q1 current collection extremely low level, so as to export low level to output unit 12；As the damage of module lamp bar or MOS
When tube grid is opened a way, it is low level that constant current chip U1 status pin is overturn by high level, and triode Q1 ends, because of triode Q1
Colelctor electrode the reference voltage pin of constant current chip is connected to by 3rd resistor R3, cause triode Q1 colelctor electrode to be changed into high
Level, so as to export high level to subsequent conditioning circuit.
Please continue to refer to Fig. 1 and Fig. 2, the Delayed conducting unit 13 includes the 4th resistance R4 and the second electric capacity C2, described
4th resistance R4 one end connects the colelctor electrode of the triode Q1, also by the 3rd resistor R3 connections constant current chip
U1 reference voltage pin, the other end of the 4th resistance R4 are grounded by the second electric capacity C2, also connect the output unit
12。
Specifically, the 4th resistance R4 and the second electric capacity C2 form a charging circuit, are full of in the second electric capacity C2
After electricity, the other end of the 4th resistance R4 is just powered to the output unit 12, so as to reach power supply described in delayed startup
The purpose of latching circuit, when it is implemented, the sensitivity of protection circuit can be changed by changing regulation R4 and C2, make it can be pre-
The purpose of protection lamp bar is realized in the time known.
Please continue to refer to Fig. 1 and Fig. 2, the output unit 12 includes the 3rd electric capacity C3, diode D1 and the 5th resistance R5,
The positive pole of the diode D1 connects the other end of the 4th resistance R4, is grounded also by the 3rd electric capacity C3, described two
Pole pipe D1 negative pole passes through the 5th resistance R5 connections power supply latching circuit 2.
Specifically, the diode D1 has one-way conduction, while can also prevent the back-end circuit of output unit 12
Caused electric current reversely pours in down a chimney, in diode D1 just extremely high level, diode D1 conductings so that follow-up power supply self-locking
Circuit turn-on is acted, and in diode D1 just extremely low level, diode D1 is not turned on, and follow-up power supply latching circuit is motionless
Make.
In order to be better understood from the utility model, the technical solution of the utility model is made below in conjunction with Fig. 1 and Fig. 2 detailed
Explanation：
When constant current chip U1 normal works, its status pin output high level, triode Q1 conductings, triode Q1 collection
Electrode is low level, is not turned on so as to export low level to output unit 12, diode D1, connects the power supply of protection location 12 certainly
Lock circuit 2 is failure to actuate, power supply normal work, and whole display system is working properly；
When the metal-oxide-semiconductor drain and gate that the indivedual lamp bar open circuits of LED constant current backlight portion, backlight portion BUCK circuits occurs
（G-D）, drain electrode and source electrode（D-S）Short circuit, the metal-oxide-semiconductor grid of backlight portion BUCK circuits（G）Open circuit or backlight portion BUCK
During the inductance exception short-circuit state of circuit, it is low level that constant current chip U1 status pin is overturn by high level, and triode Q1 is cut
Only, because triode Q1 colelctor electrode is connected to by 3rd resistor R3 the reference voltage pin of constant current chip, triode Q1 is caused
Colelctor electrode be changed into high level, and give the second electric capacity C2 to charge by the 4th resistance R4, after the second electric capacity C2 charging completes, two
Pole pipe D1 is turned on, and the power supply latching circuit 2 of connection protection location 12 acts, and makes power end trigger protection, at whole display system
In guard mode, so as to avoid lamp bar, device and other generations extremely.
Based on the power protecting circuit of above-mentioned display device, the utility model also correspondingly provides a kind of display device, bag
Include the power protecting circuit of display device as described above, the display device can be television set or other have backlight drive
The display device of circuit, the utility model are not construed as limiting to this, due to making in detail to the power protecting circuit of display device above
Thin description, will not be repeated here.
In summary, the utility model, will by power protecting circuit by using the status pin function of constant current chip
The unusual condition that may occur of BUCK constant currents part passes to power unit, and thoroughly the back of the body is realized by the protection of power end
Light part module lamp bar, the safety of device, prevent the too high caused wind of the damage of module lamp bar and temperature during metal-oxide-semiconductor open-grid
Danger.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (7)
1. a kind of power protecting circuit of display device, while connect constant current chip and power supply latching circuit, it is characterised in that institute
The first input end for stating the power protecting circuit of display device connects the status pin of the constant current chip, the display device
Second input of power protecting circuit connects the reference voltage pin of the constant current chip, the power protection of the display device
The output end of circuit connects the power supply latching circuit；
The power protecting circuit of the display device includes switch element and output unit, and the status pin of the constant current chip is defeated
When entering high level signal to the switch element, the switching means conductive simultaneously exports low level signal to output unit, described
Output unit is not turned on, and the power supply latching circuit does not work；The status pin input low level signal of the constant current chip is extremely
During the switch element, the switch element cut-off, reference voltage pin input voltage to the switch element of constant current chip makes out
Close unit and export high level signal to output unit, the output unit conducting, the power supply latching circuit work and locked electricity
Source.
2. the power protecting circuit of display device according to claim 1, it is characterised in that the power supply of the display device
Protection circuit also includes the Delayed conducting unit for output unit described in Delayed conducting, and the switch element passes through the delay
Onunit connects the output unit.
3. the power protecting circuit of display device according to claim 2, it is characterised in that the switch element includes the
One resistance, second resistance, 3rd resistor, the first electric capacity and triode, one end of the first resistor connect the constant current chip
Status pin, the other end of the first resistor connects one end of first electric capacity, one end of second resistance and triode
Base stage, the other end of first electric capacity and the other end of second resistance be all connected with the emitter stage of the triode, described three
The colelctor electrode of pole pipe connects the Delayed conducting unit, the reference voltage of the constant current chip is connected also by the 3rd resistor
Pin.
4. the power protecting circuit of display device according to claim 3, it is characterised in that the Delayed conducting unit bag
The 4th resistance and the second electric capacity are included, one end of the 4th resistance connects the colelctor electrode of the triode, also by the described 3rd
Resistance connects the reference voltage pin of the constant current chip, and the other end of the 4th resistance is by the second capacity earth, also connect
Connect the output unit.
5. the power protecting circuit of display device according to claim 4, it is characterised in that the output unit includes the
Three electric capacity, diode and the 5th resistance, the positive pole of the diode connect the other end of the 4th resistance, also by described the
Three capacity earths, the negative pole of the diode connect the power supply latching circuit by the 5th resistance.
6. the power protecting circuit of display device according to claim 5, it is characterised in that the triode is NPN type
Triode.
7. a kind of display device, it is characterised in that the power supply including display device as claimed in any one of claims 1 to 6 is protected
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721050515.8U CN207117164U (en) | 2017-08-22 | 2017-08-22 | The power protecting circuit and display device of a kind of display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721050515.8U CN207117164U (en) | 2017-08-22 | 2017-08-22 | The power protecting circuit and display device of a kind of display device |
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| Publication Number | Publication Date |
|---|---|
| CN207117164U true CN207117164U (en) | 2018-03-16 |
Family
ID=61577213
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721050515.8U Active CN207117164U (en) | 2017-08-22 | 2017-08-22 | The power protecting circuit and display device of a kind of display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638956A (en) * | 2018-12-28 | 2019-04-16 | 南京奥视威电子科技股份有限公司 | Power supply switch circuit |
| CN109755923A (en) * | 2019-02-20 | 2019-05-14 | 广州视源电子科技股份有限公司 | Protection circuit, method and equipment of power supply device |
| CN109949753A (en) * | 2019-04-24 | 2019-06-28 | 深圳创维－Rgb电子有限公司 | A kind of power supply unit of backlight |
| CN110932240A (en) * | 2019-12-19 | 2020-03-27 | 苏州美思迪赛半导体技术有限公司 | Open circuit detection protection system for synchronous rectification switching power supply |
| CN115379622A (en) * | 2022-08-30 | 2022-11-22 | 广东乐心医疗电子股份有限公司 | Protective circuit of wearable equipment and application method thereof |
-
2017
- 2017-08-22 CN CN201721050515.8U patent/CN207117164U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638956A (en) * | 2018-12-28 | 2019-04-16 | 南京奥视威电子科技股份有限公司 | Power supply switch circuit |
| CN109638956B (en) * | 2018-12-28 | 2024-02-23 | 南京奥视威电子科技股份有限公司 | Power supply switching circuit |
| CN109755923A (en) * | 2019-02-20 | 2019-05-14 | 广州视源电子科技股份有限公司 | Protection circuit, method and equipment of power supply device |
| CN109949753A (en) * | 2019-04-24 | 2019-06-28 | 深圳创维－Rgb电子有限公司 | A kind of power supply unit of backlight |
| CN110932240A (en) * | 2019-12-19 | 2020-03-27 | 苏州美思迪赛半导体技术有限公司 | Open circuit detection protection system for synchronous rectification switching power supply |
| CN115379622A (en) * | 2022-08-30 | 2022-11-22 | 广东乐心医疗电子股份有限公司 | Protective circuit of wearable equipment and application method thereof |
| CN115379622B (en) * | 2022-08-30 | 2024-09-03 | 广东乐心医疗电子股份有限公司 | Protective circuit of wearable device and application method thereof |
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