WO2014153787A1 - 一种led背光驱动电路及背光模组 - Google Patents
一种led背光驱动电路及背光模组 Download PDFInfo
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- WO2014153787A1 WO2014153787A1 PCT/CN2013/073605 CN2013073605W WO2014153787A1 WO 2014153787 A1 WO2014153787 A1 WO 2014153787A1 CN 2013073605 W CN2013073605 W CN 2013073605W WO 2014153787 A1 WO2014153787 A1 WO 2014153787A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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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]
Definitions
- the LCD display panel itself cannot generate a light source, and it must be projected onto the display panel by means of a backlight, so that the display panel produces brightness, and the brightness must be evenly distributed to obtain a picture display.
- the backlight of the LCD display panel is mainly divided into LED and CCFL. Compared with CCFL backlights, LED backlights have the advantages of low power consumption, long life, ultra-thin and good optical characteristics. Therefore, liquid crystal displays with white LEDs as backlights are gradually becoming the development direction of LCD TVs.
- the liquid crystal display cannot be displayed, and the protection action mechanism of the LED backlight driving circuit is important.
- an output high voltage is connected to the positive terminal of the LED to drive the LED to emit light.
- the output high voltage will directly enter the LED constant current driving IC and other components at the back end from the negative end of the LED, so that the components are burned and the LED backlight driving circuit cannot work normally.
- an isolation MOS transistor Metal-Oxide-Semiconductor
- the source of the MOS transistor is connected to the negative end of the LED.
- the LED is connected to the constant current driving IC, and the gate is connected to the external DC working voltage to control the MOS tube to be turned on when the LED backlight driving circuit works normally through the external DC working voltage.
- the source voltage of the MOS transistor is higher than the gate voltage, which causes the MOS transistor to be disconnected, thereby preventing high voltage from entering the LED constant current driving IC and other components at the back end, thereby protecting the entire circuit.
- the LED backlight driving circuit can be protected by the function of the MOS tube, when the LED backlight driving circuit works normally, the MOS tube is turned on, the power lost on the MOS tube is large, and the temperature of the MOS tube is high, affecting its life, and MOS tube prices are also high, which is not conducive to cost reduction. In addition, when the MOS tube is disconnected, there is still a high voltage on the LED anode, which may cause certain safety hazards.
- the technical problem to be solved by the present invention is to provide an LED backlight driving circuit and a backlight module, which can protect the circuit device from damage and make the LED short circuit protection function safer and more reliable.
- the circuit protection unit is a first resistor whose resistance is less than a set value, one end of the first resistor is connected to the negative pole of the LED, and the other end is connected to the first input end of the driving unit; the current detecting unit is a second resistor, and the second resistor is One end is connected to the second input end of the driving unit, and the other end is grounded.
- the voltage conversion unit is an inductive booster circuit, including a boost inductor, a second switch transistor, a rectifier diode, and a discharge capacitor; wherein one end of the boost inductor is used as an input terminal of the voltage conversion unit, and is used for outputting with an external power source.
- the driving unit comprises a controller, a first comparator and a first switching tube; an output end of the controller is connected as an output end of the driving unit to a controlled end of the voltage converting unit, and an input end of the controller is used as a third driving unit
- the input end is connected to the control unit; the positive input end of the first comparator is used to input the first set voltage, and the negative input end of the first comparator is connected as the second input end of the drive unit to the second resistor, the first comparator
- the output end is connected to the control end of the first switch tube, and the input end of the first switch tube is connected as the first input end of the drive unit to the first resistor, and the output end of the first switch tube and the negative input end of the first comparator connection.
- the voltage conversion unit is an inductive booster circuit, including a boost inductor, a second switch transistor, a rectifier diode, and a discharge capacitor; wherein one end of the boost inductor is used as an input terminal of the voltage conversion unit, and is used for outputting with an external power source.
- the other end of the boosting inductor is respectively connected to the positive terminal of the rectifier diode and the input end of the second switching transistor, and the negative terminal of the rectifier diode is used as the output terminal of the voltage conversion unit for connecting the positive pole of the LED, and the control terminal of the second switching transistor
- the controlled end of the voltage conversion unit is connected to the output end of the driving unit, the output end of the second switching tube is grounded, one end of the discharging capacitor is connected to the negative pole of the rectifier diode, and the other end of the discharging capacitor is grounded.
- the first and second switching tubes are thin film crystal field effect transistors, and the control end of the switching tube corresponds to the gate of the thin film crystal field effect tube, and the input end of the switching tube corresponds to the drain of the thin film crystal field effect tube, the switch The output of the tube corresponds to the source of the thin film crystal field effect transistor.
- control unit is a second comparator
- the negative input end of the second comparator is used as the input end of the control unit for connecting the negative pole of the LED
- the positive input end of the second comparator is used for inputting the second set voltage
- the second The output of the comparator is connected as the output of the control unit to the third input of the drive unit.
- an LED backlight module including an LED backlight driving circuit and an LED;
- the LED backlight driving circuit includes a voltage conversion unit, a driving unit, a circuit protection unit, and a control unit.
- a current detecting unit the input end of the voltage converting unit is used for connecting the output end of the external power source, and the output end of the voltage converting unit is connected to the positive pole of the LED for converting the output voltage of the external power source into a driving voltage required for the LED, the driving unit The output end is connected to the controlled end of the voltage conversion unit for driving the voltage conversion unit to realize voltage conversion; the circuit protection unit is serially connected between the LED negative electrode and the first input end of the driving unit, and the current detecting unit and the driving unit The second input terminal is connected to the circuit protection unit through the driving unit for detecting the magnitude of the current flowing through the LED, wherein the maximum power allowed by the circuit protection unit is less than the driving voltage is directly applied to the circuit protection unit.
- the circuit protection unit is a first resistor whose resistance is less than a set value, one end of the first resistor is connected to the negative pole of the LED, and the other end is connected to the first input end of the driving unit; the current detecting unit is a second resistor, and the second resistor is One end is connected to the second input end of the driving unit, and the other end is grounded.
- the driving unit comprises a controller, a first comparator and a first switching tube; an output end of the controller is connected as an output end of the driving unit to a controlled end of the voltage converting unit, and an input end of the controller is used as a third driving unit
- the input is connected to the control unit.
- the positive input terminal of the first comparator is configured to input a first set voltage
- the negative input terminal of the first comparator is connected as a second input end of the driving unit to the second resistor, and the output end of the first comparator and the first switch
- the control end of the tube is connected.
- the input end of the first switch tube is connected as a first input end of the drive unit to the first resistor, and the output end of the first switch tube is connected to the negative input end of the first comparator.
- the voltage conversion unit is an inductive booster circuit, including a boost inductor, a second switch transistor, a rectifier diode, and a discharge capacitor; wherein one end of the boost inductor is used as an input terminal of the voltage conversion unit, and is used for outputting with an external power source.
- control unit is a second comparator
- negative input end of the second comparator is connected as the input end of the control unit to the negative pole of the LED
- positive input end of the second comparator is used to input the second set voltage
- the second comparison The output of the device is connected as the output of the control unit to the third input of the drive unit.
- the voltage conversion unit is configured to convert the output voltage of the external power source into a driving voltage required for the LED, and the output end thereof and the LED are different from the prior art.
- the positive pole is connected to provide the required driving voltage to the LED, and the driving unit is used to control the voltage conversion unit to realize voltage conversion
- the circuit protection unit is serially connected between the negative pole of the LED and the driving unit, and the maximum allowed by the circuit protection unit
- the power is less than the power of the circuit protection unit when the driving voltage of the LED is directly applied to the circuit protection unit, so that when the positive and negative electrodes of the LED are short-circuited, since the driving voltage is applied to the circuit protection unit, the circuit protection unit is subjected to
- the actual power is greater than the maximum power allowed, resulting in the circuit protection unit being burned to form an open circuit, thereby cutting off the connection between the LED and the driving unit, that is, blocking the driving voltage into the driving unit, effectively protecting the driving unit in the LED
- the positive and negative pole is connected to provide the required driving voltage to the
- an embodiment of the LED backlight driving circuit of the present invention includes a voltage converting unit 201, a driving unit 202, a protection unit 203, a control unit 204, and a current detecting unit 205.
- the voltage conversion unit 201 includes an input end, an output end and a controlled end, and an input end thereof is used for connecting an output end of the external power source, and an output end of the voltage conversion unit 201 is used for connecting the positive pole of the LED to provide a driving voltage to the LED.
- the driving unit 202 includes an output end and three input ends, and an output end thereof is connected to the controlled end of the voltage converting unit 201 for driving the voltage converting unit 201 to realize voltage conversion, so that the voltage converting unit 201 outputs the external power source.
- the brightness of the LED is determined by the amount of current flowing through it. Therefore, multiple LEDs are connected in series, and the LED backlight driving circuit can provide a higher driving voltage according to the characteristics of the series voltage division, so that the voltage on each LED can obtain the required forward voltage.
- the voltage conversion unit 201 is a boosting driving circuit for converting the output voltage of the external power source into a driving voltage required for the LED string, and the driving voltage obtained is higher than the output voltage of the external power source.
- the driving unit 202 is configured to output a driving signal to the voltage converting unit 201 to control the voltage converting unit 201 to implement voltage conversion.
- the current detecting unit 205 is connected to the circuit protection unit 203 through the driving unit 202 for detecting the magnitude of the current flowing through the LED and feeding back the detected current to the driving unit 202.
- the positive input terminal of the first comparator CM1 is used to input the first set voltage V1, and the negative input terminal of the first comparator CM1 is connected as the second input end of the driving unit 302 to one end of the second resistor R2, and the second resistor R2 The other end is grounded, and the output of the first comparator CM1 is connected to the control terminal of the first switching transistor Q1.
- the first input end of the first switch Q1 is connected to one end of the first resistor R1, and the output end of the first switch Q1 is connected to the negative input end of the first comparator CM1, and the first resistor R1 is connected. The other end is connected to the negative pole of the LED string.
- the external power source Vin provides an output voltage to the voltage conversion unit 301.
- the driving signal outputted by the controller 3021 is a square wave pulse signal to control the turning on and off of the second switching transistor Q2 to implement the voltage converting function of the voltage converting unit 301, and the voltage converting unit 301 finally reaches the stable output driving voltage. status.
- the controller 3021 first outputs a high level.
- the second switching transistor Q2 is turned on, and the boosting inductor L1 converts the electric energy into magnetic energy, and the process converts the electric energy into the boosting inductor L1. The process of magnetic energy.
- the first comparator CM1 and the first switching transistor Q1 in the driving unit 302 are used to adjust the brightness of the LED string, and the brightness of the LED string is related to the current flowing through the LED string.
- the current flowing through the LED string is equal to the current flowing through the LED string equal to the ratio of the driving voltage of the LED string to the sum of the resistance values of the LED string, the first resistor R1, the first switching transistor Q1, and the second resistor R2.
- the resistance value of any one of the LED string, the first resistor R1, the first switching transistor Q1, and the second resistor R2 changes, and the current of the LED string is affected.
- the second resistor R2 converts the current signal flowing through the LED string into a voltage signal and feeds back to the negative input terminal of the first comparator CM1.
- the voltage signal is the voltage across the second resistor R2.
- the first comparator CM1 compares the voltage across the second resistor R2 with the first set voltage V1 input to the positive input terminal. When the voltage across the second resistor R2 is less than the first set voltage V1, the actual current flowing through the LED string is less than the set value, and the first comparator CM1 outputs the comparison result to the control end of the first switch Q1.
- the impedance between the input end and the output end of the first switching transistor Q1 is reduced, thereby The current of the LED string is increased until the voltage on the second resistor R2 is equal to the first set voltage V1 such that the actual current of the LED string is equal to the set value.
- the voltages of the positive input terminal and the negative input terminal of the first comparator CM1 are equal, so that the first comparator CM1 maintains the on-resistance of the first switch transistor Q1 at this time, thereby making the current of the LED string constant.
- the current flowing through the LED string is finally made constant and equal to the set value of the current flowing through the LED string, thereby realizing the brightness adjustment of the initial stage of driving the LED string.
- the first resistor R1 selects a resistor device with a small resistance value, and makes the resistance value smaller than the set value.
- the driving voltage outputted by the voltage converting unit 301 is directly applied to the first resistor R1, and the resistance of the first resistor R1 is less than a set value, which is based on the actual driving voltage of the LED string.
- the actual power is greater than the maximum power allowed, causing the first resistor R1 to be blown, thereby forming an open circuit, cutting off the connection between the LED negative electrode and the driving unit 302, so that the high voltage of the LED negative pole does not enter the driving of the rear stage.
- Unit 302 protects drive unit 302 from damage.
- the voltage of the negative pole of the LED string reaches the driving voltage value, that is, the voltage input to the negative input terminal of the second comparator CM2 is the driving voltage, and the second comparator CM2 inputs the positive input terminal.
- the second set voltage V2 is compared with the driving voltage input by the negative input terminal. Since the second set voltage V2 is smaller than the driving voltage, the driving voltage input to the negative input terminal of the second comparator CM2 is higher than the positive input terminal.
- the first resistor R1 is used instead of the conventional isolation MOS transistor as a circuit protection unit when the LED string is short-circuited, which can effectively protect the circuit components from damage and also reduce cost, and at the same time increase the second comparator CM2.
- the device can control the driving unit 302 to stop working when the LED string is short-circuited positively and negatively, so that the voltage conversion unit 301 no longer outputs a high driving voltage, thereby reducing the safety hazard of the high voltage.
- an LED backlight driving circuit and an LED are included, wherein the LED backlight driving circuit is the LED backlight driving circuit of each of the above embodiments.
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Abstract
Description
Claims (16)
- 一种LED背光驱动电路,其中,包括电压转换单元、驱动单元、电路保护单元、控制单元以及电流检测单元;所述电压转换单元的输入端用于连接外界电源的输出端,所述电压转换单元的输出端用于连接LED的正极,用于将所述外界电源的输出电压转换为LED所需的驱动电压,所述驱动单元的输出端与所述电压转换单元的受控端连接,用于驱动所述电压转换单元实现电压的转换;所述电路保护单元串接在LED负极和驱动单元的第一输入端之间,所述电流检测单元与驱动单元的第二输入端连接,以通过所述驱动单元与所述电路保护单元连接,用于检测流过LED的电流的大小,其中,所述电路保护单元所允许的最大功率小于所述驱动电压直接加在电路保护单元上时所述电路保护单元所承受的功率,以在LED正负极短路时形成开路,进而切断LED与所述驱动单元之间的连接;所述控制单元的输入端用于连接LED的负极,所述控制单元的输出端与所述驱动单元的第三输入端连接,以在所述电路保护单元形成开路时向所述驱动单元输出停止工作的控制信号;其中,所述驱动单元包括控制器、第一比较器和第一开关管,所述控制器的输出端作为驱动单元的输出端与所述电压转换单元的受控端连接,所述控制器的输入端作为驱动单元的第三输入端与所述控制单元连接,所述第一比较器的正极输入端用于输入第一设定电压,所述第一比较器的负极输入端作为驱动单元的第二输入端与所述电流检测单元连接,所述第一比较器的输出端与所述第一开关管的控制端连接,所述第一开关管的输入端作为驱动单元的第一输入端与所述电路保护单元连接,所述第一开关管的输出端与所述第一比较器的负极输入端连接;所述控制单元为第二比较器,所述第二比较器的负极输入端作为控制单元的输入端用于连接LED的负极,所述第二比较器的正极输入端用于输入第二设定电压,所述第二比较器的输出端作为控制单元的输出端与驱动单元的第三输入端连接。
- 根据权利要求1所述的电路,其中,所述电路保护单元为阻值小于设定值的第一电阻,所述第一电阻的一端连接LED的负极,另一端连接所述驱动单元的第一输入端;所述电流检测单元为第二电阻,所述第二电阻的一端连接所述驱动单元的第二输入端,另一端接地。
- 根据权利要求2所述的电路,其中,所述电压转换单元为电感式升压电路,包括升压电感、第二开关管、整流二极管以及放电电容;其中,所述升压电感的一端作为电压转换单元的输入端,用于与外界电源的输出端连接,所述升压电感的另一端分别与所述整流二极管的正极和所述第二开关管的输入端连接,所述整流二极管的负极作为电压转换单元的输出端用于连接LED的正极,所述第二开关管的控制端作为电压转换单元的受控端与所述驱动单元的输出端连接,所述第二开关管的输出端接地,所述放电电容的一端与所述整流二极管的负极连接,所述放电电容的另一端接地。
- 根据权利要求3所述的电路,其中,所述第一、第二开关管均为薄膜晶体场效应管,所述开关管的控制端对应为薄膜晶体场效应管的栅极,所述开关管的输入端对应为薄膜晶体场效应管的漏极,所述开关管的输出端对应为薄膜晶体场效应管的源极。
- 一种LED背光驱动电路,其中,包括电压转换单元、驱动单元、电路保护单元、控制单元以及电流检测单元;所述电压转换单元的输入端用于连接外界电源的输出端,所述电压转换单元的输出端用于连接LED的正极,用于将所述外界电源的输出电压转换为LED所需的驱动电压,所述驱动单元的输出端与所述电压转换单元的受控端连接,用于驱动所述电压转换单元实现电压的转换;所述电路保护单元串接在LED负极和驱动单元的第一输入端之间,所述电流检测单元与驱动单元的第二输入端连接,以通过所述驱动单元与所述电路保护单元连接,用于检测流过LED的电流的大小,其中,所述电路保护单元所允许的最大功率小于所述驱动电压直接加在电路保护单元上时所述电路保护单元所承受的功率,以在LED正负极短路时形成开路,进而切断LED与所述驱动单元之间的连接;所述控制单元的输入端用于连接LED的负极,所述控制单元的输出端与所述驱动单元的第三输入端连接,以在所述电路保护单元形成开路时向所述驱动单元输出停止工作的控制信号。
- 根据权利要求5所述的电路,其中,所述电路保护单元为阻值小于设定值的第一电阻,所述第一电阻的一端连接LED的负极,另一端连接所述驱动单元的第一输入端;所述电流检测单元为第二电阻,所述第二电阻的一端连接所述驱动单元的第二输入端,另一端接地。
- 根据权利要求6所述的电路,其中,所述驱动单元包括控制器、第一比较器和第一开关管;所述控制器的输出端作为驱动单元的输出端与所述电压转换单元的受控端连接,所述控制器的输入端作为驱动单元的第三输入端与所述控制单元连接;所述第一比较器的正极输入端用于输入第一设定电压,所述第一比较器的负极输入端作为驱动单元的第二输入端与第二电阻连接,所述第一比较器的输出端与所述第一开关管的控制端连接,所述第一开关管的输入端作为驱动单元的第一输入端与第一电阻连接,所述第一开关管的输出端与所述第一比较器的负极输入端连接。
- 根据权利要求7所述的电路,其中,所述电压转换单元为电感式升压电路,包括升压电感、第二开关管、整流二极管以及放电电容;其中,所述升压电感的一端作为电压转换单元的输入端,用于与外界电源的输出端连接,所述升压电感的另一端分别与所述整流二极管的正极和所述第二开关管的输入端连接,所述整流二极管的负极作为电压转换单元的输出端用于连接LED的正极,所述第二开关管的控制端作为电压转换单元的受控端与所述驱动单元的输出端连接,所述第二开关管的输出端接地,所述放电电容的一端与所述整流二极管的负极连接,所述放电电容的另一端接地。
- 根据权利要求8所述的电路,其中,所述第一、第二开关管均为薄膜晶体场效应管,所述开关管的控制端对应为薄膜晶体场效应管的栅极,所述开关管的输入端对应为薄膜晶体场效应管的漏极,所述开关管的输出端对应为薄膜晶体场效应管的源极。
- 根据权利要求6所述的电路,其中,所述控制单元为第二比较器,所述第二比较器的负极输入端作为控制单元的输入端用于连接LED的负极,所述第二比较器的正极输入端用于输入第二设定电压,所述第二比较器的输出端作为控制单元的输出端与驱动单元的第三输入端连接。
- 一种LED背光模组,其中,包括LED背光驱动电路和LED;所述LED背光驱动电路包括电压转换单元、驱动单元、电路保护单元、控制单元以及电流检测单元;所述电压转换单元的输入端用于连接外界电源的输出端,所述电压转换单元的输出端连接所述LED的正极,用于将所述外界电源的输出电压转换为所述LED所需的驱动电压,所述驱动单元的输出端与所述电压转换单元的受控端连接,用于驱动所述电压转换单元实现电压的转换;所述电路保护单元串接在所述LED负极和驱动单元的第一输入端之间,所述电流检测单元与驱动单元的第二输入端连接,以通过所述驱动单元与所述电路保护单元连接,用于检测流过所述LED的电流的大小,其中,所述电路保护单元所允许的最大功率小于所述驱动电压直接加在电路保护单元上时所述电路保护单元所承受的功率,以在所述LED正负极短路时形成开路,进而切断所述LED与驱动单元之间的连接;所述控制单元的输入端与所述LED的负极连接,所述控制单元的输出端与所述驱动单元的第三输入端连接,以在所述电路保护单元形成开路时向所述驱动单元输出停止工作的控制信号。
- 根据权利要求11所述的背光模组,其中,所述电路保护单元为阻值小于设定值的第一电阻,所述第一电阻的一端连接所述LED的负极,另一端连接所述驱动单元的第一输入端;所述电流检测单元为第二电阻,所述第二电阻的一端连接所述驱动单元的第二输入端,另一端接地。
- 根据权利要求12所述的背光模组,其中,所述驱动单元包括控制器、第一比较器和第一开关管;所述控制器的输出端作为驱动单元的输出端与所述电压转换单元的受控端连接,所述控制器的输入端作为驱动单元的第三输入端与所述控制单元连接。所述第一比较器的正极输入端用于输入第一设定电压,所述第一比较器的负极输入端作为驱动单元的第二输入端与第二电阻连接,所述第一比较器的输出端与所述第一开关管的控制端连接,所述第一开关管的输入端作为驱动单元的第一输入端与第一电阻连接,所述第一开关管的输出端与所述第一比较器的负极输入端连接。
- 根据权利要求13所述的背光模组,其中,所述电压转换单元为电感式升压电路,包括升压电感、第二开关管、整流二极管以及放电电容;其中,所述升压电感的一端作为电压转换单元的输入端,用于与外界电源的输出端连接,所述升压电感的另一端分别与所述整流二极管的正极和所述第二开关管的输入端连接,所述整流二极管的负极作为电压转换单元的输出端用于连接LED的正极,所述第二开关管的控制端作为电压转换单元的受控端与所述驱动单元的输出端连接,所述第二开关管的输出端接地,所述放电电容的一端与所述整流二极管的负极连接,所述放电电容的另一端接地。
- 根据权利要求14所述的背光模组,其中,所述第一、第二开关管均为薄膜晶体场效应管,所述开关管的控制端对应为薄膜晶体场效应管的栅极,所述开关管的输入端对应为薄膜晶体场效应管的漏极,所述开关管的输出端对应为薄膜晶体场效应管的源极。
- 根据权利要求12所述的背光模组,其中,所述控制单元为第二比较器,所述第二比较器的负极输入端作为控制单元的输入端与所述LED的负极连接,所述第二比较器的正极输入端用于输入第二设定电压,所述第二比较器的输出端作为控制单元的输出端与驱动单元的第三输入端连接。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107580394A (zh) * | 2017-09-28 | 2018-01-12 | 宗仁科技(平潭)有限公司 | 一种驱动芯片、驱动方法、照明电路及照明*** |
CN114708822A (zh) * | 2022-04-12 | 2022-07-05 | 长沙硕博电子科技股份有限公司 | 一种led屏背光恒流防短路控制***及防短路故障控制方法 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115101006B (zh) * | 2022-07-22 | 2023-05-23 | 绵阳惠科光电科技有限公司 | 发光驱动电路和显示装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007142139A (ja) * | 2005-11-18 | 2007-06-07 | Toyoda Gosei Co Ltd | Ledの駆動制御装置 |
CN201766754U (zh) * | 2010-09-07 | 2011-03-16 | 深圳北森科技有限公司 | 一种具有保护功能的非隔离型led驱动电源 |
CN102711321A (zh) * | 2012-05-04 | 2012-10-03 | 福建捷联电子有限公司 | 发光二极管驱动电路 |
CN102983554A (zh) * | 2012-12-31 | 2013-03-20 | 杭州士兰微电子股份有限公司 | 用于高功率因数驱动***的采样短路保护电路及方法 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3434098B2 (ja) * | 1995-09-29 | 2003-08-04 | 三菱重工業株式会社 | 双方向信号転送回路の保護装置 |
JPH1155847A (ja) * | 1997-07-29 | 1999-02-26 | Yazaki Corp | 車両負荷制御装置 |
KR100936180B1 (ko) * | 2003-03-03 | 2010-01-11 | 삼성전자주식회사 | 백라이트 어셈블리 및 이를 이용한 액정표시장치 |
JP2004342544A (ja) * | 2003-05-19 | 2004-12-02 | Matsushita Electric Ind Co Ltd | 回路保護素子 |
JP4400880B2 (ja) * | 2004-10-05 | 2010-01-20 | 株式会社小糸製作所 | 車両用灯具の点灯制御回路 |
JP4506593B2 (ja) * | 2005-07-20 | 2010-07-21 | 株式会社デンソー | 照明装置 |
CN100530320C (zh) * | 2006-04-28 | 2009-08-19 | 鸿富锦精密工业(深圳)有限公司 | 电压侦测电路及使用其的放电灯驱动装置 |
KR101308979B1 (ko) * | 2007-03-29 | 2013-09-17 | 삼성디스플레이 주식회사 | 백라이트 인버터 및 그것을 사용하는 액정 표시 장치 |
KR101473366B1 (ko) * | 2008-03-05 | 2014-12-17 | 삼성디스플레이 주식회사 | 광원구동방법, 이를 수행하기 위한 광원 장치 및 이 광원장치를 포함하는 표시 장치 |
US8242704B2 (en) * | 2008-09-09 | 2012-08-14 | Point Somee Limited Liability Company | Apparatus, method and system for providing power to solid state lighting |
JP5225940B2 (ja) * | 2009-06-23 | 2013-07-03 | 新日本無線株式会社 | 負荷駆動回路 |
CN101916547B (zh) * | 2010-07-14 | 2012-10-17 | 成都芯源***有限公司 | 驱动多个发光元件的驱动器以及显示设备 |
CN201780764U (zh) * | 2010-08-05 | 2011-03-30 | 中航华东光电有限公司 | 基于fpga的特种背光源驱动电路 |
CN102446492A (zh) * | 2010-10-08 | 2012-05-09 | 联咏科技股份有限公司 | 短路侦测电路及方法与发光二极管驱动芯片及装置 |
CN102231261B (zh) * | 2011-06-10 | 2013-07-10 | 中航华东光电有限公司 | 一种led背光源驱动电路及其控制方法 |
JP2013004792A (ja) * | 2011-06-17 | 2013-01-07 | Sharp Corp | 発光装置および自発光ディスプレイ装置、並びに、上記発光装置を備えた照明装置およびバックライト |
JP5829067B2 (ja) * | 2011-07-11 | 2015-12-09 | ローム株式会社 | Led駆動装置、照明装置、液晶表示装置 |
CN202632722U (zh) * | 2012-05-04 | 2012-12-26 | 福建捷联电子有限公司 | 发光二极管驱动电路 |
CN102956204B (zh) * | 2012-11-30 | 2015-11-25 | 深圳市华星光电技术有限公司 | 一种led背光驱动电路、背光模组和液晶显示装置 |
-
2013
- 2013-03-27 CN CN201310102384.3A patent/CN103177698B/zh not_active Expired - Fee Related
- 2013-04-02 JP JP2015560518A patent/JP6069535B2/ja active Active
- 2013-04-02 DE DE112013006752.8T patent/DE112013006752B4/de not_active Expired - Fee Related
- 2013-04-02 WO PCT/CN2013/073605 patent/WO2014153787A1/zh active Application Filing
- 2013-04-02 GB GB201513147A patent/GB2526952B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007142139A (ja) * | 2005-11-18 | 2007-06-07 | Toyoda Gosei Co Ltd | Ledの駆動制御装置 |
CN201766754U (zh) * | 2010-09-07 | 2011-03-16 | 深圳北森科技有限公司 | 一种具有保护功能的非隔离型led驱动电源 |
CN102711321A (zh) * | 2012-05-04 | 2012-10-03 | 福建捷联电子有限公司 | 发光二极管驱动电路 |
CN102983554A (zh) * | 2012-12-31 | 2013-03-20 | 杭州士兰微电子股份有限公司 | 用于高功率因数驱动***的采样短路保护电路及方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107580394A (zh) * | 2017-09-28 | 2018-01-12 | 宗仁科技(平潭)有限公司 | 一种驱动芯片、驱动方法、照明电路及照明*** |
CN107580394B (zh) * | 2017-09-28 | 2024-03-05 | 宗仁科技(平潭)股份有限公司 | 一种驱动芯片、驱动方法、照明电路及照明*** |
CN114708822A (zh) * | 2022-04-12 | 2022-07-05 | 长沙硕博电子科技股份有限公司 | 一种led屏背光恒流防短路控制***及防短路故障控制方法 |
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