CN106255266B - A kind of drive circuit - Google Patents
A kind of drive circuit Download PDFInfo
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- CN106255266B CN106255266B CN201610709416.XA CN201610709416A CN106255266B CN 106255266 B CN106255266 B CN 106255266B CN 201610709416 A CN201610709416 A CN 201610709416A CN 106255266 B CN106255266 B CN 106255266B
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- 239000003990 capacitor Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 14
- 239000010409 thin film Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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]
-
- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of drive circuit, and it includes：Half-bridge resonance module, control module, the first transformer, the second transformer transformer and multiple LEDs；Wherein, half-bridge resonance module is connected with the first transformer and the second transformer, and control module is connected with the first transformer, the second transformer and LED, and the second transformer is connected with LED；The drive circuit of the present invention generates control signal to half-bridge resonance block by the first transformer, control half-bridge resonance module generation predeterminated voltage, and exported predeterminated voltage to LED by the second transformer, circuit structure is simpler, reduces cost and improves conversion efficiency；It is more to solve existing drive circuit periphery circuit, complex circuit, different voltage conversion power attenuations are big, the higher technical problem of cost.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a driving circuit.
Background
With the continuous progress of the technology, the backlight technology of the liquid crystal display device is continuously developed. A backlight of a conventional liquid crystal display device employs a Cold Cathode Fluorescent Lamp (CCFL). However, since CCFL backlights have the disadvantages of poor color reduction capability, low luminous efficiency, high discharge voltage, poor discharge characteristics at low temperature, and long time for stabilizing gray scale by heating, backlight technologies using LED backlights have been developed.
In an LED backlight, a special backlight driving circuit is required to provide a driving voltage for the LED string to emit light normally. In the existing large-size television backlight power supply, a driving circuit of the existing large-size television backlight power supply is generally driven by a series resonance circuit, and a constant voltage is output and then is output to a backlight source through a booster circuit. However, the existing driving circuit has more peripheral circuits, complex circuits, large power loss of different voltage conversion and high cost.
Therefore, it is necessary to provide a driving circuit to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a driving circuit to solve the technical problems that the existing driving circuit has more peripheral circuits, complex circuits, large power loss of different voltage conversion and high cost.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
an embodiment of the present invention provides a driving circuit, including: the LED lamp comprises a half-bridge resonance module, a control module, a first transformer, a second transformer and a plurality of LED lamps; wherein,
the half-bridge resonance module is connected with the first transformer and the second transformer, the control module is connected with the first transformer, the second transformer and the LED lamp, and the second transformer is connected with the LED lamp;
the half-bridge resonance module is used for receiving an input voltage and generating a preset voltage under the control of a first control signal and a second control signal;
the second transformer is used for outputting preset voltage to the LED lamp;
the control module is used for receiving the preset voltage and generating a first signal for driving the first transformer to generate a first control signal or a second signal for driving the first transformer to generate a second control signal to the first transformer.
The first transformer is used for outputting a first control signal or a second control signal to the half-bridge resonance module.
In the driving circuit of the invention, the half-bridge resonance module comprises a first switch tube, a second switch tube, a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
the input end of the first switch tube receives input voltage, the control end of the first switch tube is connected with the anode of the first diode, one end of the first resistor and one end of the second resistor, the cathode of the first diode and the other end of the first resistor are connected with the second end of the first transformer, and the output end of the second switch tube and the other end of the second resistor are connected with the first end of the first transformer and the first end of the second transformer;
the input end of the second switching tube is connected with the first end of the first transformer and the first end of the second transformer, the control end of the second switching tube is connected with the anode of the second diode, one end of the third resistor and one end of the fourth resistor, the cathode of the second diode and the other end of the third resistor are connected with the third end of the first transformer, and the output end of the second switching tube and the other end of the fourth resistor are grounded;
one end of the first capacitor is connected with the second end of the second transformer, and the other end of the first capacitor is grounded.
In the driving circuit of the present invention, the first switching tube and the second switching tube are thin film transistors.
In the driving circuit of the invention, the control module comprises a driving signal detection unit, a dimming unit, an output unit and a balance control chip;
the driving signal detection unit is connected with the second transformer and the balance control chip, the dimming unit is connected with the LED lamp and the balance control chip, and the output unit is connected with the first transformer and the balance control chip;
the driving signal detection unit is used for detecting a preset voltage and generating a feedback signal to the balance control chip;
and the dimming unit is used for outputting a dimming signal.
The output unit is used for outputting the first signal or the second signal to the first transformer;
the balance control chip is used for receiving the feedback signal generated by the driving signal detection unit to generate a first signal or a second signal to the output unit.
In the driving circuit of the present invention, the driving signal detecting unit includes a third diode, a fourth diode, a fifth resistor, and a sixth resistor;
one end of the fifth resistor, one end of the sixth resistor, the anode of the third diode and the anode of the fourth diode are connected with the three ends of the second transformer, the other end of the fifth resistor and the other end of the sixth resistor are grounded, and the cathode of the third diode and the cathode of the fourth diode are connected with the balance control chip.
In the driving circuit of the invention, the dimming unit comprises a third switching tube, a fourth switching tube, a seventh resistor and an eighth resistor;
the input end of the third switching tube is connected with the LED lamp, the control end of the third switching tube is connected with the balance control chip, the output end of the third switching tube is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded;
the input end of the fourth switch tube is connected with the LED lamp, the control end of the fourth switch tube is connected with the balance control chip, the output end of the fourth switch tube is connected with one end of the eighth resistor, and the other end of the eighth resistor is grounded.
In the driving circuit of the invention, the output unit includes a second capacitor, one end of the second capacitor is connected with the first output end of the balance control chip, the other end of the second capacitor is connected with the fourth end of the first transformer, and the second output end of the balance control chip is connected with the fifth end of the first transformer.
According to the driving circuit, the control signal is generated to the half-bridge resonance module through the first transformer, the half-bridge resonance module is controlled to generate the preset voltage, and the preset voltage is output to the LED lamp through the second transformer, so that the circuit structure is simpler, the cost is reduced, and the conversion efficiency is improved; the technical problems that the existing driving circuit has more peripheral circuits, complex circuits, large power loss of different voltage conversion and high cost are solved.
In order to make the aforementioned and other objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:
drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a preferred embodiment of the driving circuit of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of a driving circuit of the present invention;
the drive circuit of the present preferred embodiment includes: the LED lamp comprises a half-bridge resonance module 101, a control module 102, a first transformer M1, a second transformer M2 and a plurality of LED lamps; wherein,
the half-bridge resonance module 101 is connected with a first transformer M1 and a second transformer M2, the control module 102 is connected with a first transformer M1, a second transformer M2 and an LED lamp, and the second transformer M2 is connected with the LED lamp;
the half-bridge resonance module 101 is configured to receive an input voltage and generate a preset voltage under the control of a first control signal and a second control signal;
the second transformer M2 is used for outputting a preset voltage to the LED lamp;
the control module 102 is configured to receive a preset voltage and generate a first signal for driving the first transformer to generate a first control signal or a second signal for driving the first transformer to generate a second control signal to the first transformer M1.
The first transformer M1 is used to output a first control signal or a second control signal to the half-bridge resonant module 101.
In the driving circuit of the present invention, the half-bridge resonant module 101 includes a first switch transistor T1, a second switch transistor T2, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1;
an input end of a first switch tube T1 receives an input voltage, a control end of the first switch tube T1 is connected with an anode of a first diode D1, one end of a first resistor R1 and one end of a second resistor R2, a cathode of the first diode D1 and the other end of the first resistor R1 are connected with a second end of a first transformer M1, and an output end of the second switch tube T2 and the other end of a second resistor R2 are connected with a first end of the first transformer M1 and a first end of a second transformer M2;
an input end of a second switch tube T2 is connected to a first end of the first transformer M1 and a first end of the second transformer M2, a control end of the second switch tube T2 is connected to an anode of a second diode D2, one end of a third resistor R3 and one end of a fourth resistor R4, a cathode of the second diode D2 and the other end of the third resistor R3 are connected to a third end of the first transformer M1, and an output end of the second switch tube T2 and the other end of the fourth resistor R4 are grounded;
one end of the first capacitor C1 is connected to the second end of the second transformer M2, and the other end of the first capacitor C1 is grounded.
In the driving circuit of the preferred embodiment, the first switching transistor T1 and the second switching transistor T2 are thin film transistors.
In the driving circuit of the preferred embodiment, the control module 102 includes a driving signal detection unit 1021, a dimming unit 1022, an output unit 1023, and a balance control chip;
the driving signal detection unit 1021 is connected with the second transformer M2 and the balance control chip, the dimming unit 1022 is connected with the LED lamp and the balance control chip, and the output unit 1023 is connected with the first transformer M1 and the balance control chip;
the driving signal detection unit 1021 is used for detecting a preset voltage and generating a feedback signal to the balance control chip;
the dimming unit 1022 is configured to output a dimming signal.
An output unit 1023 for outputting the first signal or the second signal to the first transformer M1;
the balance control chip is used for receiving the feedback signal generated by the driving signal detection unit 1021 to generate a first signal or a second signal to the output unit 1023.
In the driving circuit of the preferred embodiment, the driving signal detecting unit 1021 includes a third diode D3, a fourth diode D4, a fifth resistor R5, and a sixth resistor R6;
one end of the fifth resistor R5, one end of the sixth resistor R6, the anode of the third diode D3 and the anode of the fourth diode D4 are connected to the three ends of the second transformer M2, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are grounded, and the cathode of the third diode D3 and the cathode of the fourth diode D4 are connected to the balance control chip.
In the driving circuit of the preferred embodiment, the dimming unit 1022 includes a third switching tube T3, a fourth switching tube T4, a seventh resistor R7, and an eighth resistor R8;
the input end of a third switching tube T3 is connected with the LED lamp, the control end of the third switching tube T3 is connected with the balance control chip, the output end of the third switching tube T3 is connected with one end of a seventh resistor R7, and the other end of the seventh resistor R7 is grounded;
the input end of the fourth switching tube T4 is connected with the LED lamp, the control end of the fourth switching tube T4 is connected with the balance control chip, the output end of the fourth switching tube T4 is connected with one end of an eighth resistor R8, and the other end of the eighth resistor R8 is grounded.
In the driving circuit of the preferred embodiment, the third switching tube and the fourth switching tube are thin film transistors.
In the driving circuit of the preferred embodiment, the output unit 1023 includes a second capacitor C2, one end of the second capacitor C2 is connected to the first output terminal of the balance control chip, the other end of the second capacitor C2 is connected to the fourth terminal of the first transformer M1, and the second output terminal of the balance control chip is connected to the fifth terminal of the first transformer.
When the driving circuit of the preferred embodiment is used, a working voltage is first provided to the balance control chip to make it in a working state, at this time, the balance control chip sends a second signal from the second output terminal of the balance control chip to flow through the fifth terminal of the first transformer T1, then to the fourth terminal of the first transformer T1, and finally to the first output terminal of the balance control chip, the first transformer T1 outputs the first control signal through mutual inductance, specifically, the voltage at the second terminal of the first transformer T1 is higher than the voltage at the second terminal of the first transformer T1, the voltage at the third terminal of the first transformer T1 is higher than the ground, therefore, the first switch tube T1 is turned on, the second switch tube T2 is turned off, the input voltage Vi flows through the first end of the second transformer T2 via the first switch tube T1, and then is subjected to voltage conversion via the first capacitor C1 from the second end of the second transformer T2;
then, the balance control chip sends out a first signal, the first signal flows from the first output end of the balance control chip through the fourth end of the first transformer T1, then to the fifth end of the first transformer T1, and finally to the second output end of the balance control chip, the first transformer T1 outputs a second control signal through mutual inductance, specifically, the voltage of the second end of the first transformer T1 is lower than the voltage of the second end of the first transformer T1, the voltage of the third end of the first transformer T1 is lower than the ground, so that the first switch tube T1 is closed, the second switch tube T2 is opened, the first capacitor C1 discharges, and the first signal is converted into the voltage of the second switch tube through the second end of the second transformer T2 and the first end of the second transformer T2.
Then the balance control chip does not send out the first signal and the second signal, the first switch tube T1 and the second switch tube T2 are turned off, and the energy stored in the second transformer T2 is output to the LED lamp.
In particular, the driving circuit of the preferred embodiment detects the output signal through the driving signal detecting unit 1021, and then processes the signal according to the internal comparator of the balance control chip, so as to adjust the duty ratio of the first signal and the second signal, so that the driving circuit meets the requirement of driving the LED lamp.
Further, the driving circuit of the preferred embodiment controls the brightness of the LED lamp through the dimming unit 1052.
The driving circuit of the preferred embodiment generates the control signal to the half-bridge resonance module through the first transformer, controls the half-bridge resonance module to generate the preset voltage, and outputs the preset voltage to the LED lamp through the second transformer, so that the circuit structure is simpler, the cost is reduced, and the conversion efficiency is improved; the technical problems that the existing driving circuit has more peripheral circuits, complex circuits, large power loss of different voltage conversion and high cost are solved.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (6)
1. A driver circuit, comprising: the LED lamp comprises a half-bridge resonance module, a control module, a first transformer, a second transformer and a plurality of LED lamps; wherein,
the half-bridge resonance module is connected with the first transformer and the second transformer, the control module is connected with the first transformer, the second transformer and the LED lamp, and the second transformer is connected with the LED lamp;
the half-bridge resonance module is used for receiving an input voltage and generating a preset voltage under the control of a first control signal and a second control signal;
the second transformer is used for outputting the preset voltage to the LED lamp;
the control module is used for receiving the preset voltage and generating a first signal for driving the first transformer to generate the first control signal or a second signal for driving the first transformer to generate the second control signal to the first transformer;
the first transformer is used for outputting the first control signal or the second control signal to the half-bridge resonance module;
the control module comprises a driving signal detection unit, a dimming unit, an output unit and a balance control chip;
the driving signal detection unit is connected with the second transformer and the balance control chip, the dimming unit is connected with the LED lamp and the balance control chip, and the output unit is connected with the first transformer and the balance control chip;
the driving signal detection unit is used for detecting the preset voltage and generating a feedback signal to the balance control chip;
the dimming unit is used for outputting a dimming signal;
the output unit is used for outputting the first signal or the second signal to the first transformer;
the balance control chip is used for receiving the feedback signal generated by the driving signal detection unit to generate the first signal or the second signal to the output unit;
the driving signal detection unit is further configured to detect the first signal and the second signal, and process the first signal and the second signal according to an internal comparator of the balance control chip to adjust duty ratios of the first signal and the second signal.
2. The driving circuit of claim 1, wherein the half-bridge resonant module comprises a first switch tube, a second switch tube, a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor;
the input end of the first switch tube receives input voltage, the control end of the first switch tube is connected with the anode of the first diode, one end of the first resistor and one end of the second resistor, the cathode of the first diode and the other end of the first resistor are connected with the second end of the first transformer, and the output end of the second switch tube and the other end of the second resistor are connected with the first end of the first transformer and the first end of the second transformer;
an input end of the second switching tube is connected with a first end of the first transformer and a first end of the second transformer, a control end of the second switching tube is connected with an anode of the second diode, one end of the third resistor and one end of the fourth resistor, a cathode of the second diode and the other end of the third resistor are connected with a third end of the first transformer, and an output end of the second switching tube and the other end of the fourth resistor are grounded;
one end of the first capacitor is connected with the second end of the second transformer, and the other end of the first capacitor is grounded.
3. The driving circuit as claimed in claim 2, wherein the first and second switching tubes are thin film transistors.
4. The drive circuit according to claim 1, wherein the drive signal detection unit includes a third diode, a fourth diode, a fifth resistor, and a sixth resistor;
one end of the fifth resistor, one end of the sixth resistor, the anode of the third diode and the anode of the fourth diode are connected with the three ends of the second transformer, the other end of the fifth resistor and the other end of the sixth resistor are grounded, and the cathode of the third diode and the cathode of the fourth diode are connected with the balance control chip.
5. The driving circuit according to claim 1, wherein the dimming unit comprises a third switching tube, a fourth switching tube, a seventh resistor and an eighth resistor;
the input end of the third switching tube is connected with the LED lamp, the control end of the third switching tube is connected with the balance control chip, the output end of the third switching tube is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded;
the input end of the fourth switch tube is connected with the LED lamp, the control end of the fourth switch tube is connected with the balance control chip, the output end of the fourth switch tube is connected with one end of the eighth resistor, and the other end of the eighth resistor is grounded.
6. The driving circuit of claim 1, wherein the output unit comprises a second capacitor, one end of the second capacitor is connected to the first output terminal of the balance control chip, the other end of the second capacitor is connected to the fourth terminal of the first transformer, and the second output terminal of the balance control chip is connected to the fifth terminal of the first transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610709416.XA CN106255266B (en) | 2016-08-23 | 2016-08-23 | A kind of drive circuit |
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| CN201610709416.XA CN106255266B (en) | 2016-08-23 | 2016-08-23 | A kind of drive circuit |
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| CN106255266B true CN106255266B (en) | 2018-03-13 |
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| US10271392B2 (en) | 2017-05-16 | 2019-04-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LLC backlight driving control circuit |
| CN106991978B (en) * | 2017-05-16 | 2020-04-10 | 深圳市华星光电技术有限公司 | Backlight drive control circuit based on LLC |
| CN111162660A (en) * | 2020-01-08 | 2020-05-15 | 毛昭祺 | Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit |
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| JP2005116616A (en) * | 2003-10-03 | 2005-04-28 | Toshiba Corp | Led drive circuit and led drive system |
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| CN103874288A (en) * | 2014-01-06 | 2014-06-18 | 青岛海信电器股份有限公司 | LED (light emitting diode) light bar driving circuit and LCD (liquid crystal display) television |
| CN104935843A (en) * | 2015-06-16 | 2015-09-23 | 康佳集团股份有限公司 | LED (Light-Emitting Diode) television two-in-one power supply circuit and LED television |
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| CN106255266A (en) | 2016-12-21 |
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