CN205378259U - Drive circuit , backlight unit and LED TV are shaded - Google Patents
Drive circuit , backlight unit and LED TV are shaded Download PDFInfo
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- CN205378259U CN205378259U CN201521051904.3U CN201521051904U CN205378259U CN 205378259 U CN205378259 U CN 205378259U CN 201521051904 U CN201521051904 U CN 201521051904U CN 205378259 U CN205378259 U CN 205378259U
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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 discloses a drive circuit, backlight unit and LED TV are shaded, wherein, including constant current drive chip, switch drive module, transformer and current foldback circuit, wherein, the connecting through switch drive module elementarily of transformer, the secondary connection LED lamp strip of transformer, LED lamp strip is connected to the constant current drive chip, and the constant current drive chip is linked switch drive module still, control switch drive module's break -make, the elementary or secondary of transformer is connected to current foldback circuit's sampling input, and the control pin of constant current drive chip is connected to current foldback circuit's output, when current foldback circuit is lighter than presupposition voltage at the voltage of its sampling input, export a voltage signal with the work of control constant current drive chip, when current foldback circuit reaches presupposition voltage at the voltage of its sampling input, export the 2nd voltage signal with control constant current drive chip stop work. The utility model discloses the effective overcurrent protection who realizes LED lamp strip of technical scheme.
Description
Technical field
This utility model relates to backlight technology field, particularly to a kind of backlight drive circuit, backlight module and LED television.
Background technology
Nowadays, it is contemplated that the factor of LED television cost, screen and backlight portion all adopt homemade quasi-screen module, and this kind of module uses iron plate less, and the earthing effect of power supply module, cartridge assemblies and LED lamp bar is bad.Backlight module is in abnormal cases, such as, complete machine is subject to the impact of surge current or the impact etc. of electrostatic, interference signal can pass through ground line loop interference constant-current driven chip, and the normal operation of constant-current driven chip can be affected, it is impossible to normal current-sharing, output current anomaly increases, sometimes the peak value even exporting electric current can increase to normal 3-5 times moment, and LED lamp bar cannot bear so big abnormal current, it is easy to the risk being burned out.
Utility model content
Main purpose of the present utility model is to provide a kind of backlight drive circuit, it is intended to the overcurrent protection to LED lamp bar.
For achieving the above object; the backlight drive circuit that the utility model proposes; it is connected with LED lamp bar; including constant-current driven chip, switch drive module, transformator and current foldback circuit, wherein, the primary of described transformator connects power supply through described switch drive module; the secondary of described transformator connects described LED lamp bar; described constant-current driven chip connects described LED lamp bar, and described constant-current driven chip is also connected with described switch drive module, controls the break-make of described switch drive module；The sampling input of described current foldback circuit connects primary or the secondary of described transformator, and the outfan of described current foldback circuit connects the control pin of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input is less than predeterminated voltage, exports the first voltage signal to control the work of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input reaches predeterminated voltage, exports the second voltage signal and quits work to control described constant-current driven chip.
Preferably, described current foldback circuit includes sampling resistor, NPN type triode and optocoupler；Wherein, the anode of the light emitting diode of described optocoupler connects power supply, and negative electrode connects the colelctor electrode of described NPN type triode；The colelctor electrode of the phototriode of described optocoupler connects power supply, grounded emitter, and the outfan of the extremely described current foldback circuit of the current collection of the phototriode of described optocoupler；The grounded emitter of described NPN type triode；One end ground connection of described sampling resistor, the other end is sampling input the base stage connecting described NPN type triode.
Preferably, described current foldback circuit also includes the first resistance and the first electric capacity, and the base stage of described NPN type triode connects described sampling input through described first resistance, and the base stage of described NPN type triode is also through described first capacity earth.
Preferably, described current foldback circuit also includes the second resistance, and the negative electrode of the light emitting diode of described optocoupler connects the colelctor electrode of described NPN type triode through described second resistance.
Preferably, described switch drive module includes driver element and switch element, described switch element includes the first switching tube and the second switch pipe that are series between described power supply and ground, primary one end of described transformator connects the link of described first switching tube and described second switch pipe, and the primary other end of described transformator is through a storage capacitor ground connection；The input of described driver element connects described constant-current driven chip, and the first outfan of described driver element connects the triggering end of described first switching tube, and the second outfan of described driver element connects the triggering end of described second switch pipe.
Preferably, described sampling resistor is connected between described second switch pipe and ground.
This utility model also proposes a kind of backlight module; including LED lamp bar and backlight drive circuit; described backlight drive circuit includes constant-current driven chip, switch drive module, transformator and current foldback circuit; wherein; the primary of described transformator connects power supply through described switch drive module; the secondary of described transformator connects described LED lamp bar; described constant-current driven chip connects described LED lamp bar; described constant-current driven chip is also connected with described switch drive module, controls the break-make of described switch drive module；The sampling input of described current foldback circuit connects primary or the secondary of described transformator, and the outfan of described current foldback circuit connects the control pin of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input is less than predeterminated voltage, exports the first voltage signal to control the work of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input reaches predeterminated voltage, exports the second voltage signal and quits work to control described constant-current driven chip.
This utility model also proposes a kind of LED television; including backlight module; described backlight module includes LED lamp bar and backlight drive circuit; described backlight drive circuit includes constant-current driven chip, transformator and current foldback circuit; the primary of described transformator connects power supply; the secondary of described transformator connects described LED lamp bar; described constant-current driven chip connects described LED lamp bar; the sampling input of described current foldback circuit connects the primary of described transformator, and the outfan of described current foldback circuit connects the control pin of described constant-current driven chip；Described current foldback circuit, when the electric current of its sampling input is less than predetermined current, exports high level signal；Described current foldback circuit its sampling input electric current reach predetermined current time, output low level signal.
Primary input or the secondary output of transformator are carried out voltage sample by adopting current foldback circuit by technical solutions of the utility model; control pin by the size of sampled voltage with the comparison of the predeterminated voltage corresponding level signal of output to constant-current driven chip; thus controlling the duty of constant current chip; to control startup or the disconnection of whole backlight drive circuit, reach the overcurrent protection to LED lamp bar；Concrete, when LED lamp bar normal operation, current foldback circuit exports first voltage signal control pin to constant-current driven chip, makes backlight drive circuit keep normal operation；When LED lamp bar crosses stream extremely, current foldback circuit exports second voltage signal control pin to constant-current driven chip, makes constant-current driven chip quit work, so that whole backlight drive circuit disconnects, effectively realizes the overcurrent protection to LED lamp bar.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to the structure according to these accompanying drawings obtains other accompanying drawing.
Fig. 1 is the circuit module schematic diagram that this utility model backlight drive circuit preferred embodiment is connected with LED lamp bar；
Fig. 2 is the circuit diagram of this utility model backlight drive circuit preferred embodiment.
Drawing reference numeral illustrates:
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
Need explanation, in this utility model embodiment, directional instruction (such as up, down, left, right, before and after ...) is only for explaining relative position relation between each parts, motion conditions etc. under a certain particular pose (as shown in drawings), if this particular pose changes, then directionality instruction also correspondingly changes therewith.
It addition, relate to the description of " first ", " second " etc. in this utility model only for descriptive purposes, and it is not intended that instruction or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.Additionally; technical scheme between each embodiment can be combined with each other; but must be based on those of ordinary skill in the art are capable of; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme is absent from, also not this utility model require protection domain within.
The utility model proposes a kind of backlight drive circuit, be connected with LED lamp bar, to drive LED lamp bar.
Seeing figures.1.and.2, Fig. 1 is the circuit module schematic diagram that this utility model backlight drive circuit 100 preferred embodiment is connected with LED lamp bar 10；Fig. 2 is the circuit diagram of this utility model backlight drive circuit 100 preferred embodiment.
With reference to Fig. 1; in the present embodiment; this backlight drive circuit 100 includes constant-current driven chip 20, switch drive module 60, transformator 30 and current foldback circuit 40; wherein; the primary of transformator 30 connects power supply 50 (such as PFC output) through switch drive module 60; the secondary of transformator 30 connects LED lamp bar 10; constant-current driven chip 20 connects LED lamp bar 10; constant-current driven chip 20 is also connected with switch drive module 60; control the break-make of switch drive module 60, thus controlling the break-make of the primary supplies of transformator 30；Primary or the secondary of sampling input 41 connection transformer 30 of current foldback circuit 40 (are directly connected to the primary of transformator 30 for input 41 of sampling in the present embodiment Fig. 1; certainly; sampling input 41 can also be indirectly connected with the primary of transformator 30 through device); the outfan of current foldback circuit 40 connects the control pin 21 (such as, enabling pin) of constant-current driven chip 20；Current foldback circuit 40, when the voltage of its sampling input 41 is less than predeterminated voltage, exports the first voltage signal (such as, high level signal) and works to control constant-current driven chip 20；Current foldback circuit 40, when the voltage of its sampling input 41 reaches predeterminated voltage, exports the second voltage signal (such as, low level signal) and quits work to control described constant-current driven chip 20.The present embodiment crosses the voltage ratio of current circuit: 1, compare sampled voltage by the conducting state of switching tube, and 2, compared etc. by comparator.
The operation principle of the backlight drive circuit 100 of the present embodiment is: power supply 50, from the primary input of transformator 30, exports from 30 levels of transformator after transformator 30 amplifies and powers to LED lamp bar 10, and constant-current driven chip 20 controls the current constant in LED lamp bar 10；During backlight drive circuit 100 normal operation; the secondary output current of transformator 30 is constant; then the electric current (becoming the proportionate relationship fixed with secondary output current) of the primary of transformator 30 is also constant; now; the voltage that the sampling input 41 of current foldback circuit 40 samples is less than predeterminated voltage; overcurrent protection electric current exports the first voltage signal to the control pin 21 of constant-current driven chip 20, makes constant-current driven chip 20 continue to keep normal operation；When circuit is subject to the situation such as the impact of surge current or the impact of electrostatic, interference signal interferes with constant-current driven chip 20 by ground line loop, and when causing the current anomaly flowing through LED lamp bar 10 to increase (namely the voltage of the secondary output end of transformator 30 increases), the primary current of transformator 30 increases in proportion, the voltage of sampling input 41 reaches predeterminated voltage, current foldback circuit 40 exports second voltage signal control pin 21 to constant-current driven chip 20, so that constant-current driven chip 20 quits work to disconnect whole backlight drive circuit 100, realize the overcurrent protection to LED lamp bar 10.
Primary input or the secondary output of transformator 30 are carried out voltage sample by adopting current foldback circuit 40 by the present embodiment technical scheme; control pin 21 by the size of sampled voltage with the comparison of the predeterminated voltage corresponding voltage signal of output to constant-current driven chip 20; thus controlling the duty of constant current chip; to control startup or the disconnection of whole backlight drive circuit 100, reach the overcurrent protection to LED lamp bar 10；Concrete, when LED lamp bar 10 normal operation, current foldback circuit 40 exports first voltage signal control pin 21 to constant-current driven chip 20, makes backlight drive circuit 100 keep normal operation；When LED lamp bar 10 crosses stream extremely; current foldback circuit 40 exports second voltage signal control pin 21 to constant-current driven chip 20; make constant-current driven chip 20 quit work, so that whole backlight drive circuit 100 disconnects, effectively realize the overcurrent protection to LED lamp bar 10.
Further, the present embodiment adopts the sampling input 41 of current foldback circuit 40 to connect the primary of described transformator 30.The sampling input 41 of such current foldback circuit 40 is by gathering the primary voltage of transformator 30; indirectly reflect the curent change situation of 30 levels of transformator; avoid the secondary output of sampling input 41 connection transformer 30 of current foldback circuit 40; and the secondary situation interfering impact that exports on transformator 30 so that the protection of current foldback circuit 40 triggers more reliable；At the same time it can also be the device of transformator 30 primary is carried out overcurrent protection, achieve protected effect more fully.
Further, in conjunction with Fig. 1 and with reference to Fig. 2, the current foldback circuit 40 of the present embodiment includes sampling resistor Rs, NPN type triode Q1 and optocoupler PC；Wherein, the anode of the light emitting diode of optocoupler PC connects power supply 50, and negative electrode connects the colelctor electrode of NPN type triode Q1；The colelctor electrode of the phototriode of optocoupler PC connects power supply, grounded emitter, and the outfan of the current collection of the phototriode of optocoupler PC extremely current foldback circuit 40；The grounded emitter of NPN type triode Q1；One end ground connection of sampling resistor Rs, the other end is sampling input 41 base stage connecting NPN type triode Q1.Can realizing effective isolation by optocoupler PC, outfan will not be interfered impact by sampling input 41.It should be noted that the NPN type triode Q1 of the present embodiment can also other switching tube realizing identical function or circuitry instead.
The operation principle of the present embodiment current foldback circuit 40 is: the base voltage of NPN type triode Q1 is the voltage (voltage of input 41 of namely sampling) on sampling resistor Rs, when LED lamp bar 10 normal operation, the secondary output current of transformator 30 is normal, then the primary current of transformator 30 is less, voltage on sampling resistor Rs is less, conducting voltage (i.e. predeterminated voltage) less than NPN type triode Q1, NPN type triode Q1 ends, then the light emitting diode of optocoupler PC is not turned on, then the phototriode cut-off of optocoupler PC, the colelctor electrode (i.e. outfan) of phototriode exports the high level (i.e. the first voltage signal) the control pin 21 to constant-current driven chip 20；When constant-current driven chip 20 receives interference, when causing LED lamp bar 10 current anomaly to increase, namely the secondary output current of transformator 30 increases, then the primary current of transformator 30 also scales up, voltage on sampling resistor Rs increases, conducting voltage more than or equal to NPN type triode Q1, NPN type triode Q1 turns on, and then the LEDs ON of optocoupler PC, the phototriode conducting of optocoupler PC, the colelctor electrode output ground connection of phototriode, namely output low level (the second voltage signal) is to the control pin 21 of constant-current driven chip 20.
Further; owing to there may be interference signal (such as spike etc.) on sampling resistor Rs; the voltage instantaneous easily causing sampling input 41 increases and conducting voltage more than NPN type triode Q1; then causing misleading of NPN type triode Q1, current foldback circuit 40 produces to protect operation by mistake.Therefore, the current foldback circuit 40 of the present embodiment also includes the base stage of the first resistance R1 and the first electric capacity C1, NPN type triode Q1 and connects sampling input 41 through the first resistance R1, and the base stage of NPN type triode Q1 is also through the first electric capacity C1 ground connection.RC loop is formed by the first resistance R1 and the first electric capacity C1; the signal of sampling input 41 can be filtered; eliminate interference signal and cause that the voltage instantaneous of base terminal increases and causes situation about misleading to occur so that the protection operation of current foldback circuit 40 more can reliably, accurately.
Concrete; the current foldback circuit 40 of the present embodiment also includes the second resistance R2; the negative electrode of the light emitting diode of optocoupler PC connects the colelctor electrode of NPN type triode Q1 through the second resistance R2, by concatenating the second resistance R2, it is to avoid the electric current flow through of NPN type triode Q1 is excessive.
Further, in conjunction with Fig. 1 and with reference to Fig. 2, in the present embodiment, switch drive module 60 includes driver element 61 and switch element 62, switch element 62 includes the first switching tube Q1 and the second switch pipe Q2 that are series between power supply 50 and ground, primary one end of transformator 30 connects the link of the first switching tube and second switch pipe, and the primary other end of transformator 30 is through a storage capacitor C1 ground connection；The input of driver element 61 connects constant-current driven chip 20, and the first outfan of driver element 61 connects the triggering end of the first switching tube Q1, and the second outfan of driver element 61 connects the triggering end of second switch pipe Q2.The first switching tube Q1 in the present embodiment and second switch pipe Q2 is for metal-oxide-semiconductor, and certainly, the first switching tube Q1 and second switch pipe Q2 can also be audion or other type of switching tube or switching device.In the present embodiment, when constant-current driven chip 20 works, the voltage of output checker is to driver element 61, the first outfan and the second outfan that make driver element 61 alternately export high and low level signal, thus control the first switching tube Q1 and second switch pipe Q2 alternate conduction, so that the secondary output voltage checker of transformator 30.
Further, the present embodiment adopts sampling resistor Rs to be connected between second switch pipe Q2 and ground, namely in the present embodiment, by the input 41 primary through second switch pipe Q2 connection transformer 30 of sampling.So can realize the first switching tube Q1 and second switch pipe Q2 overcurrent protection.
This utility model also proposes a kind of backlight module, and this backlight module includes LED lamp bar 10 and backlight drive circuit 100, and this backlight drive circuit 100 is connected with LED lamp bar 10, to drive LED lamp bar 10.The concrete structure of this backlight drive circuit 100 is with reference to above-described embodiment, owing to this backlight module have employed whole technical schemes of above-mentioned all embodiments, therefore at least having all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.
This utility model also proposes a kind of LED television, this LED television includes backlight module, the concrete structure of this backlight module is with reference to above-described embodiment, owing to this LED television have employed whole technical schemes of above-mentioned all embodiments, therefore at least having all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every under inventive concept of the present utility model; utilize the equivalent structure transformation that this utility model description and accompanying drawing content are made, or directly/be indirectly used in other relevant technical fields and be included in scope of patent protection of the present utility model.
Claims (8)
1. a backlight drive circuit; it is connected with LED lamp bar; it is characterized in that; including constant-current driven chip, switch drive module, transformator and current foldback circuit, wherein, the primary of described transformator connects power supply through described switch drive module; the secondary of described transformator connects described LED lamp bar; described constant-current driven chip connects described LED lamp bar, and described constant-current driven chip is also connected with described switch drive module, controls the break-make of described switch drive module；The sampling input of described current foldback circuit connects primary or the secondary of described transformator, and the outfan of described current foldback circuit connects the control pin of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input is less than predeterminated voltage, exports the first voltage signal to control the work of described constant-current driven chip；Described current foldback circuit, when the voltage of its sampling input reaches predeterminated voltage, exports the second voltage signal and quits work to control described constant-current driven chip.
2. backlight drive circuit as claimed in claim 1, it is characterised in that described current foldback circuit includes sampling resistor, NPN type triode and optocoupler；Wherein, the anode of the light emitting diode of described optocoupler connects power supply, and negative electrode connects the colelctor electrode of described NPN type triode；The colelctor electrode of the phototriode of described optocoupler connects power supply, grounded emitter, and the outfan of the extremely described current foldback circuit of the current collection of the phototriode of described optocoupler；The grounded emitter of described NPN type triode；One end ground connection of described sampling resistor, the other end is sampling input the base stage connecting described NPN type triode.
3. backlight drive circuit as claimed in claim 2; it is characterized in that; described current foldback circuit also includes the first resistance and the first electric capacity, and the base stage of described NPN type triode connects described sampling input through described first resistance, and the base stage of described NPN type triode is also through described first capacity earth.
4. backlight drive circuit as claimed in claim 2, it is characterised in that described current foldback circuit also includes the second resistance, the negative electrode of the light emitting diode of described optocoupler connects the colelctor electrode of described NPN type triode through described second resistance.
5. backlight drive circuit as claimed in claim 2, it is characterized in that, described switch drive module includes driver element and switch element, described switch element includes the first switching tube and the second switch pipe that are series between described power supply and ground, primary one end of described transformator connects the link of described first switching tube and described second switch pipe, and the primary other end of described transformator is through a storage capacitor ground connection；The input of described driver element connects described constant-current driven chip, and the first outfan of described driver element connects the triggering end of described first switching tube, and the second outfan of described driver element connects the triggering end of described second switch pipe.
6. backlight drive circuit as claimed in claim 5, it is characterised in that described sampling resistor is connected between described second switch pipe and ground.
7. a backlight module, including LED lamp bar, it is characterised in that also include the backlight drive circuit as described in any one in claim 1 to 6.
8. a LED television, it is characterised in that described LED television includes backlight module as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521051904.3U CN205378259U (en) | 2015-12-15 | 2015-12-15 | Drive circuit , backlight unit and LED TV are shaded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521051904.3U CN205378259U (en) | 2015-12-15 | 2015-12-15 | Drive circuit , backlight unit and LED TV are shaded |
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| Publication Number | Publication Date |
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| CN205378259U true CN205378259U (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521051904.3U Expired - Fee Related CN205378259U (en) | 2015-12-15 | 2015-12-15 | Drive circuit , backlight unit and LED TV are shaded |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782348A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
| CN109272949A (en) * | 2018-12-07 | 2019-01-25 | 合肥惠科金扬科技有限公司 | A kind of backlight drive circuit of display device, driving method and display device |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN110933383A (en) * | 2018-09-19 | 2020-03-27 | 青岛海信电器股份有限公司 | Overcurrent protection method and device for antenna control chip and satellite television receiver |
-
2015
- 2015-12-15 CN CN201521051904.3U patent/CN205378259U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782348A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
| CN110933383A (en) * | 2018-09-19 | 2020-03-27 | 青岛海信电器股份有限公司 | Overcurrent protection method and device for antenna control chip and satellite television receiver |
| CN109272949A (en) * | 2018-12-07 | 2019-01-25 | 合肥惠科金扬科技有限公司 | A kind of backlight drive circuit of display device, driving method and display device |
| CN109272949B (en) * | 2018-12-07 | 2023-09-26 | 合肥惠科金扬科技有限公司 | Backlight driving circuit and driving method of display device and display device |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN110417251B (en) * | 2019-07-09 | 2021-08-13 | 广东美的制冷设备有限公司 | PFC circuit and air conditioner |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20160706 Termination date: 20211215 |