WO2016023299A1 - 交直流变换器、电源板和显示装置 - Google Patents

交直流变换器、电源板和显示装置 Download PDF

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Publication number
WO2016023299A1
WO2016023299A1 PCT/CN2014/092525 CN2014092525W WO2016023299A1 WO 2016023299 A1 WO2016023299 A1 WO 2016023299A1 CN 2014092525 W CN2014092525 W CN 2014092525W WO 2016023299 A1 WO2016023299 A1 WO 2016023299A1
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Prior art keywords
voltage
control
circuit
conversion circuit
output
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PCT/CN2014/092525
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English (en)
French (fr)
Inventor
张凯亮
冈村政和
先建波
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京东方科技集团股份有限公司
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Priority to US14/772,262 priority Critical patent/US10026372B2/en
Publication of WO2016023299A1 publication Critical patent/WO2016023299A1/zh

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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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/066—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode particular circuits having a special characteristic
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • 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
    • 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
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
    • 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
    • G09G3/36—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 using liquid crystals
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode

Definitions

  • the present disclosure relates to an AC-DC converter, a power board, and a display device.
  • a power board in a liquid crystal display device (for example, a liquid crystal display and a liquid crystal television) is used to convert an input alternating current into a direct current to supply power to a backlight, a liquid crystal driving circuit, and the like.
  • a backlight or a liquid crystal driving circuit is used as a load on a power supply board, if a short circuit occurs, a dangerous situation such as a wire may be caused to cause a fire due to excessive current.
  • the current power board has a corresponding protection circuit to protect the load on the power board from being short-circuited.
  • the output voltage is monitored by a resistor divider. When the voltage is abnormal (for example, the output voltage is too large), the power output is output. Shut down to protect the load. However, when the load is short-circuited, the current in the power board suddenly rises in a short time, causing a strong current impact on the load and the power board device, and some devices may be damaged before the power output is turned off.
  • the present disclosure provides an AC-DC converter, a power supply board, and a display device to solve the problem of damage to the device of the circuit caused by a sudden rise in current when the load is short-circuited in the prior art.
  • An embodiment of the present disclosure provides an AC-DC converter, including:
  • the transformer includes a primary coil and a secondary coil, a first end of the primary coil is coupled to a positive output end of the AC-DC conversion circuit, and a second end of the primary coil is used to connect a load;
  • a voltage monitoring circuit having an input end coupled to the first end of the secondary coil, the second end of the secondary coil being grounded;
  • control circuit the input end of which is coupled to the output end of the voltage monitoring circuit, and the output end of which is coupled to the AC-DC conversion circuit;
  • the voltage monitoring circuit outputs a control voltage when a voltage outputted by the first end of the secondary coil of the transformer exceeds a first threshold; and when the control voltage exceeds a second threshold, the control circuit
  • the AC-DC conversion circuit is controlled to stop supplying power.
  • the output end of the AC-DC converter is provided with a transformer, so that the current output by the AC-DC conversion circuit is supplied to the load through the primary coil of the transformer, and the transformer can delay the AC-DC converter when the load is short-circuited.
  • the rise of the output current allows the control circuit to turn off the power supply during the current rise and when the current is not very strong, thereby avoiding device damage caused by high current damage to the device.
  • the AC-DC conversion circuit includes a rectifier, a filter capacitor, and a switching converter;
  • the first input end of the rectifier receives the positive output signal of the alternating current power source, and the second input end thereof is connected to the negative output end of the alternating current power source; the first output end thereof is respectively connected to the input end of the switching converter and the positive pole of the filter capacitor The second output end is respectively connected to the negative output end of the AC-DC conversion circuit and the negative electrode of the filter capacitor;
  • the output of the switching converter is connected to the positive output terminal of the AC-DC conversion circuit.
  • the voltage monitoring circuit includes a first Zener diode connected in series, a first resistor and a second resistor;
  • the anode of the first voltage regulator is connected to the input end of the voltage monitoring circuit
  • the first end of the first resistor is coupled to the anode of the first voltage regulator, the first end of the second resistor is coupled to the second end of the first resistor, and the second resistor The first end is further connected to the output end of the voltage monitoring circuit, and the second end of the second resistor is grounded.
  • the first The voltage regulator when the voltage output by the first end of the secondary coil of the transformer received by the positive pole of the voltage regulator circuit of the voltage monitoring circuit exceeds the first threshold, the first The voltage regulator is turned on; the first resistor and the second resistor divide a voltage of a negative output of the first voltage regulator, and the first voltage of the second resistor outputs the control voltage.
  • control circuit comprises:
  • a relay coupled between the control circuit and the AC-DC conversion circuit
  • control chip wherein a signal input end of the control chip is connected to an input end of the control circuit
  • the high frequency switch tube has a control end coupled to the signal output end of the control chip, a source terminal connected to the relay, and a drain end connected to the ground;
  • the third resistor has a first end connected to the control end of the high frequency switch tube and a second end grounded.
  • control chip of the control circuit when the signal input end of the control chip of the control circuit receives the control voltage output by the voltage monitoring circuit exceeds a second threshold, the control chip controls the high frequency switch tube to be turned on;
  • the turned-on high frequency switch transistor operates the relay of the AC-DC conversion circuit to turn off the power supply of the AC-DC conversion circuit.
  • the relay includes a relay coil, a normally open contact, a normally closed contact and a common end; the first end of the relay coil is connected to a high level power supply through a diode, and the second end of the relay coil is connected high a level power supply, a common terminal of the relay is connected to a positive output terminal of the alternating current power source, and a normally open contact of the relay is connected to a first input end of the rectifier;
  • the normally open contact of the relay When the AC-DC converter is working normally, the normally open contact of the relay is connected to the common end, the first input end of the rectifier receives the positive output signal of the AC power source; and the load of the AC-DC converter is short-circuited.
  • the normally closed contact of the relay is connected to the common terminal, and the first input terminal of the rectifier is unable to receive the positive output signal of the AC power source, thereby turning off the power supply of the AC-DC conversion circuit.
  • the AC-DC conversion circuit further includes a fuse disposed between the positive output of the alternating current power source and the common end of the relay.
  • the safety of the AC-DC conversion circuit is further increased by providing a fuse.
  • Embodiments of the present disclosure provide a power board including the AC-DC converter as provided in the above embodiments.
  • Embodiments of the present disclosure provide a display device including the power supply board as provided in the above embodiment.
  • FIG. 1 is a schematic structural diagram of an AC-DC converter according to an embodiment of the present disclosure
  • FIG. 2 is a circuit schematic diagram of an exemplary AC-DC converter according to an embodiment of the present disclosure
  • Figure 3 is a schematic diagram of current versus time as a known load short circuit
  • FIG. 4 is a schematic diagram showing current changes with time when a load is short-circuited in an AC-DC converter according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural diagram of an AC-DC converter provided by an embodiment of the present disclosure.
  • the AC-DC converter includes an AC-DC conversion circuit 101, a transformer 102, a voltage monitoring circuit 103, and a control circuit 104.
  • the transformer 102 includes a primary coil and a secondary coil; a first end of the primary coil is coupled to the positive output end of the AC-DC conversion circuit, a second end of the primary coil is used to connect the load; and a first end of the secondary coil is coupled At the input of the voltage monitoring circuit 103, the second end of the secondary coil is grounded.
  • the input end of the control circuit 104 is coupled to the output of the voltage monitoring circuit 103, and the output end thereof is coupled to the AC-DC conversion circuit 101.
  • the voltage monitoring circuit 103 outputs a control voltage when the voltage outputted by the first end of the secondary winding of the transformer 102 exceeds the first threshold; the control circuit 104 controls the AC-DC conversion circuit 101 to stop supplying power when the control voltage exceeds the second threshold. .
  • the output of the AC-DC converter 100 is provided with a transformer, so that the current output by the AC-DC conversion circuit 101 is supplied to the load through the primary coil of the transformer 102, and the transformer 102 can be delayed when the load is short-circuited.
  • the rise of the output current of the AC-DC converter 100 allows the control circuit 104 to turn off the power supply during the current rise and when the current is not very strong, thereby avoiding device damage caused by high current to the device.
  • the AC-DC converter includes an AC-DC conversion circuit 101, a transformer 102, a voltage monitoring circuit 103, and a control circuit 104.
  • the first end of the primary coil of the transformer 102 (the transformer T1 shown in FIG. 2) is coupled to the positive output terminal of the AC-DC conversion circuit, and the second end of the primary coil is used for connecting the load; the first end of the secondary coil is The second end of the secondary coil is coupled to the ground GND.
  • the input end of the control circuit 104 is coupled to the output of the voltage monitoring circuit 103, and the output end thereof is coupled to the AC-DC conversion circuit 101.
  • the voltage monitoring circuit 103 outputs a control voltage when the voltage outputted by the first end of the secondary winding of the transformer 102 exceeds the first threshold; the control circuit 104 controls the AC-DC conversion circuit 101 to stop supplying power when the control voltage exceeds the second threshold. .
  • the AC-DC conversion circuit 101 includes a rectifier D3, a filter capacitor C1, and a switching converter SC1.
  • the first input end of the rectifier D3 receives the positive output signal of the alternating current power source, and the second input end thereof is connected to the negative output end of the alternating current power source; the first output end thereof is respectively connected to the input end of the switching converter SC1 and the positive pole of the filter capacitor C1, the first The two output terminals are respectively connected to the negative output end of the AC-DC conversion circuit 101 and the negative electrode of the filter capacitor C1.
  • the output terminal of the switching converter SC1 is connected to the positive output terminal of the AC-DC conversion circuit 101.
  • the rectifier D3 is a bridge rectifier composed of a first diode, a second diode, a third diode and a fourth diode for inputting the input of the AC-DC conversion circuit 101.
  • the received AC voltage is rectified to a DC voltage. It is of course also possible to use other types of rectifiers that enable AC-DC conversion.
  • the filter capacitor C1 filters the DC voltage output from the rectifier D3, and the filtered DC voltage can be converted into a DC voltage of different voltage values via the switching converter SC1.
  • the relay JK1 causes the AC-DC conversion circuit 101 to be in an on state, and in the event of an abnormality, the relay JK1 turns off the AC-DC conversion circuit 101, thereby turning off.
  • the power supply of the AC-DC conversion circuit 101 In the whole process in which the AC-DC conversion circuit 101 operates normally, the relay JK1 causes the AC-DC conversion circuit 101 to be in an on state, and in the event of an abnormality, the relay JK1 turns off the AC-DC conversion circuit 101, thereby turning off. The power supply of the AC-DC conversion circuit 101.
  • the voltage monitoring circuit 103 includes:
  • a first Zener diode D1 connected in series, a first resistor R1 and a second resistor R2;
  • the anode of the first Zener diode D1 is connected to the input end of the voltage monitoring circuit 103;
  • the first end of the first resistor R1 is coupled to the cathode of the first Zener diode D1
  • the first end of the second resistor R2 is coupled to the second end of the first resistor R1
  • the first end of the second resistor R2 is further connected
  • the output of the voltage monitoring circuit 103, the second end of the second resistor R2 is grounded to GND.
  • the first voltage regulator D1 when the voltage outputted by the first end of the secondary winding of the transformer 102 of the first voltage regulator D1 of the voltage monitoring circuit 103 exceeds the first threshold, the first voltage regulator D1 is turned on; the first resistor R1 and the second resistor R1 divide a voltage of a negative output of the first Zener diode D1, and a first voltage of the second resistor R2 outputs a control voltage.
  • the first Zener diode D1 When the voltage outputted by the first end of the secondary coil of the transformer 102 received by the positive pole of the first voltage regulator D1 of the voltage monitoring circuit 103 exceeds the first threshold, the first Zener diode D1 is turned on; the first resistor R1 and the first The two resistors R2 divide the voltage of the negative output of the first Zener diode D1, and the first terminal of the second resistor R2 outputs a control voltage.
  • Control circuit 104 includes:
  • relay JK1 is coupled between the control circuit 104 and the AC-DC conversion circuit 101;
  • Control chip MCU the signal input end of the control chip MCU is the input end of the control circuit 104;
  • the high frequency switch tube Q1 has a control end coupled to the signal output end of the control chip MCU, the source end of which is connected to the relay JK1, and the drain end thereof is grounded to GND;
  • the third resistor R3 has a first end connected to the control end of the high frequency switch Q1 and a second end connected to the ground GND.
  • the signal output of the control chip MCU of the control circuit 104 When the control voltage outputted by the voltage monitoring circuit 103 received by the input terminal exceeds the second threshold, the control chip MCU controls the high frequency switching transistor Q1 to be turned on; the turned high frequency switching transistor Q1 causes the relay JK1 of the AC-DC converting circuit 101 to operate. The power supply of the AC-DC conversion circuit 101 is turned off.
  • the relay JK1 includes a relay coil (the relay coil includes a first end 4 and a second end 5), a normally open contact 2, a normally closed contact 3, and a common end 1; the first end 4 of the relay coil is connected to a high level through a diode D2
  • the power supply VCC, the second end 5 of the relay coil is connected to the high-level power supply VCC, the common end 1 of the relay JK1 is connected to the positive output end of the AC power source, and the normally open contact 2 of the relay is connected to the first input end of the rectifier D3;
  • the normally open contact 2 of the relay JK1 When the AC-DC converter is working normally, the normally open contact 2 of the relay JK1 is connected to the common terminal 1, and the first input terminal of the rectifier D3 receives the positive output signal of the AC power supply; when the load of the AC-DC converter is short-circuited, the relay JK1 The normally closed contact 3 is connected to the common terminal 1, and the first input terminal of the rectifier D3 cannot receive the positive output signal of the AC power source, thereby turning off the power supply of the AC-DC conversion circuit 101.
  • the high frequency switching transistor Q1 may be an N-channel or P-channel power MOSFET or a semiconductor switching device including an IGBT.
  • the control voltage is different.
  • the N-channel MOSFET is turned on for a high level
  • the P-channel MOSFET is turned on at a low level to ensure that the load is short-circuited.
  • the relay JK1 can be turned off, and will not be described here.
  • the AC-DC conversion circuit may further include a fuse F disposed between the positive output of the AC power source and the common terminal of the relay JK.
  • the safety of the AC-DC conversion circuit is increased by providing the fuse F.
  • the working principle of the AC-DC converter is as follows:
  • the current on the primary coil of the transformer T1 changes greatly, and the induced voltage U1 is generated in the primary coil, so that the secondary coil of the transformer T1 generates the induced voltage U2, if U2 is greater than the first
  • the threshold value (the first threshold value is the breakdown voltage of the first Zener diode D1), the first Zener diode D1 is broken down, and the voltage applied to the voltage dividing resistors R1 and R2 is U2-Vd (Vd is the first stable)
  • the tube voltage is such that the divided voltage Uc between the first resistor R1 and the second resistor R2 is (U2-Vd)*R2/(R1+R2).
  • the divided voltage UC is supplied to the control chip MCU. If the partial pressure UC is greater than the second threshold (the second threshold is preset in the control chip MCU), it is determined that the output of the AC-DC converter is short-circuited (ie, the load is short-circuited).
  • the control chip MCU outputs a control signal to turn on the high frequency switch tube Q1, so that the voltage of the first end 1 of the relay coil of the relay JK1 passes through the high frequency switch tube.
  • the source and drain of Q1 are grounded to GND, the normally closed contact 3 of the relay JK1 is connected to the common terminal 1, and the first input terminal of the rectifier D3 is unable to receive the positive output signal of the AC power source, thereby turning off the AC-DC conversion circuit 101. Power supply; if the divided voltage UC is less than the second threshold, it is determined that the output of the AC-DC converter is only a normal load current increase.
  • Figure 3 shows a schematic diagram of current versus time for a known AC-DC converter when the load is shorted, where I is the current and T is the time.
  • I the current
  • T the time.
  • the AC-DC converter suddenly rises in current when the load is short-circuited.
  • FIG. 4 is a schematic diagram showing current changes with time when the load is short-circuited by the AC-DC converter provided in the embodiment, wherein I is current and T is time; the trend of current I with time T is a curve, and thus the current rises.
  • the delays in time provide a buffering time for power cut-off, avoiding the impact of high currents on the AC-DC converter and load terminals.
  • the beneficial effects of the AC-DC converter of the embodiment of the present disclosure are as follows:
  • the output end of the AC-DC converter provided by the embodiment of the present disclosure is provided with a transformer, so that the current output by the AC-DC conversion circuit is supplied to the load through the primary coil of the transformer.
  • the transformer can delay the rise of the output current of the AC-DC converter, so that the control circuit can turn off the power supply during the current rising process and the current is not very strong, thereby avoiding the impact of the strong current on the device.
  • the resulting device is damaged; further, the transformer can separate the output of the AC-DC converter from the voltage monitoring circuit and the control circuit, thereby ensuring that the AC-DC converter is not affected by the short-circuit current.
  • Embodiments of the present disclosure provide a power board including an AC-DC converter as provided in Embodiment 1.
  • the output end of the AC-DC converter of the power board is provided with a transformer, so that the current output by the AC-DC converter circuit is supplied to the load through the primary coil of the transformer, and when the load is short-circuited
  • the transformer can delay the rise of the output current of the AC-DC converter, so that the control circuit can turn off the power supply during the current rising process and the current is not very strong, thereby avoiding device damage caused by strong current impact on the device;
  • the transformer can separate the output of the AC-DC converter from the voltage monitoring circuit and the control circuit, thereby ensuring that the AC-DC converter is not affected by the short-circuit current.
  • An embodiment of the present disclosure provides a display device including the power supply board as provided in the second embodiment.
  • the display device of the embodiment of the present disclosure has the following beneficial effects: the output end of the AC-DC converter of the power supply board is provided with a transformer, so that the current output by the AC-DC conversion circuit is supplied to the load through the primary coil of the transformer, and when the load is short-circuited,
  • the transformer can delay the rise of the output current of the AC-DC converter, so that the control circuit can turn off the power supply when the current rises and the current is not very strong, thereby Avoid damage to the device caused by high current impact on the device.
  • the transformer can separate the output of the AC-DC converter from the voltage monitoring circuit and the control circuit, thereby ensuring that the AC-DC converter is not affected by the short-circuit current.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Dc-Dc Converters (AREA)
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Abstract

一种AC-DC变换器、电源板和显示装置，该AC-DC变换器包括：AC-DC变换电路（101）；变压器（102），其初级线圈的第一端耦接于AC-DC变换电路的正极输出端，其初级线圈的第二端连接负载；电压监测电路（103），其输入端耦接于变压器次级线圈的第一端，变压器次级线圈的第二端接地；控制电路（104），其输入端耦接于电压监测电路的输出端，其输出端耦接于AC-DC变换电路；其中电压监测电路在变压器次级线圈的第一端输出的电压超过第一阈值时，输出一控制电压；控制电路在控制电压超过第二阈值时，控制AC-DC变换电路停止供电。在负载短路时，AC-DC变换器结构能够延缓AC-DC变换器的输出电流的上升，使控制电路可以在电流上升过程中关断供电从而避免强电流对器件冲击所造成的器件损坏。

Description

交直流变换器、电源板和显示装置 技术领域
本公开涉及一种AC-DC变换器、电源板和显示装置。
背景技术
液晶显示装置(例如液晶显示器和液晶电视)中的电源板用于将输入的交流电转换为直流电，为背光源、液晶驱动电路等提供电源。而背光源、液晶驱动电路作为电源板的负载，若出现短路，则可能导致电流过大引起线材起火等危险情况发生。
当前的电源板中已经有相应的保护电路，对电源板负载短路的情况进行保护，通过电阻分压的方式对输出电压进行监测，当电压发生异常后(例如输出电压过大)，将电源输出关断，对负载进行保护。但是负载短路时，电源板中的电流在短时间突然上升，会对负载和电源板的器件造成强电流的冲击，在电源输出关断前就可能导致部分器件损坏。
发明内容
本公开提供一种AC-DC变换器、电源板和显示装置，以解决现有技术中负载短路时电流突然上升，所导致的电路的器件损坏的问题。
本公开实施例提供一种AC-DC变换器，包括：
AC-DC变换电路；
变压器，所述变压器包括初级线圈及次级线圈，所述初级线圈的第一端耦接于所述AC-DC变换电路的正极输出端，所述初级线圈的第二端用于接负载；
电压监测电路，其输入端耦接于所述次级线圈的第一端，所述次级线圈的第二端接地；
控制电路，其输入端耦接于所述电压监测电路的输出端，其输出端耦接于所述AC-DC变换电路；
所述电压监测电路在所述变压器的次级线圈的第一端输出的电压超过第一阈值时，输出一控制电压；所述控制电路在所述控制电压超过第二阈值时， 控制所述AC-DC变换电路停止供电。
本公开实施例中，AC-DC变换器的输出端设置有变压器，使AC-DC变换电路输出的电流经变压器的初级线圈后提供给负载，在负载短路时，变压器能够延缓AC-DC变换器的输出电流的上升，使控制电路可以在电流上升过程中、且电流并不是很强时就关断供电，从而避免强电流对器件冲击所造成的器件损坏。
可替换地，所述AC-DC变换电路包括整流器、滤波电容及开关变换器；
所述整流器的第一输入端接收交流电源的正极输出信号，其第二输入端接交流电源的负极输出端；其第一输出端分别接所述开关变换器输入端和所述滤波电容的正极，其第二输出端分别接所述AC-DC变换电路的负极输出端和所述滤波电容的负极；
所述开关变换器的输出端接所述AC-DC变换电路的正极输出端。
可替换地，所述电压监测电路包括串接的第一稳压管、第一电阻和第二电阻；
所述第一稳压管的正极接所述电压监测电路的输入端；
所述第一电阻的第一端耦接于所述第一稳压管的负极，所述第二电阻的第一端耦接于所述第一电阻的第二端，所述第二电阻的第一端还接所述电压监测电路的输出端，所述第二电阻的第二端接地。
可替换地，所述电压监测电路的所述第一稳压管的正极接收到的所述变压器的所述次级线圈的第一端输出的电压超过所述第一阈值时，所述第一稳压管导通；所述第一电阻和所述第二电阻对所述第一稳压管的负极输出的电压进行分压，由所述第二电阻的第一端输出所述控制电压。
可替换地，所述控制电路包括：
继电器，所述继电器耦接于所述控制电路和所述AC-DC变换电路之间；
控制芯片，所述控制芯片的信号输入端接所述控制电路的输入端；
高频开关管，其控制端耦接于所述控制芯片的信号输出端，其源极端接所述继电器，其漏极端接地；
第三电阻，其第一端接所述高频开关管的控制端，其第二端接地。
可替换地，所述控制电路的所述控制芯片的信号输入端接收所述电压监测电路输出的所述控制电压超过第二阈值时，所述控制芯片控制所述高频开关管导通；
导通的所述高频开关管使所述AC-DC变换电路的所述继电器动作，关断所述AC-DC变换电路的供电。
可替换地，所述继电器包括继电器线圈、常开触点、常闭触点和公共端；所述继电器线圈的第一端通过二极管接高电平电源，所述继电器线圈的第二端接高电平电源，所述继电器的公共端接所述交流电源的正极输出端，所述继电器的常开触点接所述整流器的第一输入端；
所述AC-DC变换器正常工作时，所述继电器的常开触点和公共端连接，所述整流器的第一输入端接收交流电源的正极输出信号；所述AC-DC变换器的负载短路时，所述继电器的常闭触点和公共端连接，所述整流器的第一输入端无法接收交流电源的正极输出信号，从而关断所述AC-DC变换电路的供电。
可替换地，所述AC-DC变换电路还包括保险管，所述保险管设置于交流电源的正极输出端和所述继电器的公共端之间。本实施例中，通过设置保险管进一步增加AC-DC变换电路的安全性。
本公开实施例提供一种电源板，包括如上述实施例提供的AC-DC变换器。
本公开实施例提供一种显示装置，包括如上述实施例提供的电源板。
附图说明
图1为本公开实施例提供的AC-DC变换器的结构示意图；
图2为本公开实施例提供的一种示例性的AC-DC变换器的电路原理图；
图3为已知的负载短路时电流随时间变化的示意图；
图4本公开实施例提供的AC-DC变换器中负载短路时电流随时间变化的示意图。
具体实施方式
下面结合说明书附图对本公开实施例的实现过程进行详细说明。需要注意的是，自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
图1示出本公开实施例提供的一种AC-DC转换器的结构示意图。如图1 所示，该AC-DC转换器包括AC-DC变换电路101、变压器102、电压监测电路103和控制电路104。
变压器102包括初级线圈和次级线圈；其初级线圈的第一端耦接于AC-DC变换电路的正极输出端，初级线圈的第二端用于接负载；其次级线圈的第一端耦接于电压监测电路103的输入端，次级线圈的第二端接地。
控制电路104的输入端耦接于电压监测电路103的输出端，其输出端耦接于AC-DC变换电路101。
电压监测电路103在变压器102的次级线圈的第一端输出的电压超过第一阈值时，输出一控制电压；控制电路104在控制电压超过第二阈值时，控制AC-DC变换电路101停止供电。
在本公开实施例中，AC-DC变换器100的输出端设置有变压器，使AC-DC变换电路101输出的电流经变压器102的初级线圈后提供给负载，在负载短路时，变压器102能够延缓AC-DC变换器100的输出电流的上升，使控制电路104可以在电流上升过程中、且电流并不是很强时就关断供电，从而避免强电流对器件冲击所造成的器件损坏。
图2示出依据图1所示的AC-DC变换器的结构示意图及本公开的思想提供的一种示例性的AC-DC变换器的电路原理图。AC-DC变换器包括AC-DC变换电路101、变压器102、电压监测电路103和控制电路104。
变压器102(如图2所示的变压器T1)的初级线圈的第一端耦接于AC-DC变换电路的正极输出端，初级线圈的第二端用于接负载；其次级线圈的第一端耦接于电压监测电路103的输入端，次级线圈的第二端接地GND。
控制电路104的输入端耦接于电压监测电路103的输出端，其输出端耦接于AC-DC变换电路101。
电压监测电路103在变压器102的次级线圈的第一端输出的电压超过第一阈值时，输出一控制电压；控制电路104在控制电压超过第二阈值时，控制AC-DC变换电路101停止供电。
AC-DC变换电路101包括整流器D3、滤波电容C1及开关变换器SC1。
整流器D3的第一输入端接收交流电源的正极输出信号，其第二输入端接交流电源的负极输出端；其第一输出端分别接开关变换器SC1输入端和滤波电容C1的正极，其第二输出端分别接AC-DC变换电路101的负极输出端和滤波电容C1的负极。
开关变换器SC1的输出端接AC-DC变换电路101的正极输出端。
在本实施例中，整流器D3为第一二极管、第二二极管、第三二极管和第四二极管组成的桥式整流器，用于将AC-DC变换电路101的输入端接收的交流电压整流为直流电压。当然也可以选用能够实现AC-DC转换的其他类型整流器。滤波电容C1对整流器D3输出的直流电压进行滤波，滤波后的直流电压经开关变换器SC1可以转换为不同电压值的直流电压。在AC-DC变换电路101正常工作的整个过程，继电器JK1使AC-DC变换电路101为导通状态，在出现异常情况时，继电器JK1使AC-DC变换电路101为关断状态，从而关断所述AC-DC变换电路101的供电。
电压监测电路103包括：
串接的第一稳压管D1、第一电阻R1和第二电阻R2；
第一稳压管D1的正极接电压监测电路103的输入端；
第一电阻R1的第一端耦接于第一稳压管D1的负极，第二电阻的R2第一端耦接于第一电阻R1的第二端，第二电阻R2的第一端还接电压监测电路103的输出端，第二电阻R2的第二端接地GND。
在AC-DC变换器工作过程中，电压监测电路103的第一稳压管D1的正极接收到的变压器102的次级线圈的第一端输出的电压超过第一阈值时，第一稳压管D1导通；第一电阻R1和第二电阻R1对第一稳压管D1的负极输出的电压进行分压，由第二电阻R2的第一端输出控制电压。
电压监测电路103的第一稳压管D1的正极接收到的变压器102的次级线圈的第一端输出的电压超过第一阈值时，第一稳压管D1导通；第一电阻R1和第二电阻R2对第一稳压管D1的负极输出的电压进行分压，由第二电阻R2的第一端输出控制电压。
控制电路104包括：
继电器JK1，所述继电器JK1耦接于所述控制电路104和所述AC-DC变换电路101之间；
控制芯片MCU，控制芯片MCU的信号输入端为控制电路104的输入端；
高频开关管Q1，其控制端耦接于控制芯片MCU的信号输出端，其源极端接继电器JK1，其漏极端接地GND；
第三电阻R3，其第一端接高频开关管Q1的控制端，其第二端接地GND。
在AC-DC变换器工作过程中，控制电路104的控制芯片MCU的信号输 入端接收的电压监测电路103输出的控制电压超过第二阈值时，控制芯片MCU控制高频开关管Q1导通；导通的高频开关管Q1使AC-DC变换电路101的继电器JK1动作，关断AC-DC变换电路101的供电。
继电器JK1包括继电器线圈(继电器线圈包括第一端4和第二端5)、常开触点2、常闭触点3和公共端1；继电器线圈的第一端4通过二极管D2接高电平电源VCC，继电器线圈的第二端5接高电平电源VCC，继电器JK1的公共端1接交流电源的正极输出端，继电器的常开触点2接整流器D3的第一输入端；
AC-DC变换器正常工作时，继电器JK1的常开触点2和公共端1连接，整流器D3的第一输入端接收交流电源的正极输出信号；AC-DC变换器的负载短路时，继电器JK1的常闭触点3和公共端1连接，整流器D3的第一输入端无法接收交流电源的正极输出信号，从而关断AC-DC变换电路101的供电。
本实施例中，高频开关管Q1可以为N沟道或P沟道的功率MOSFET，或者是包括IGBT的半导体开关器件。当然对应N沟道或P沟道的功率MOSFET，提供的控制电压有所不同，例如N沟道的MOSFET对应高电平开启，P沟道的MOSFET对应低电平开启，以能够保证负载短路时继电器JK1关断即可，在此不再赘述。
可替换地，所述AC-DC变换电路还可包括保险管F，保险管F设置于交流电源的正极输出端和继电器JK的公共端之间。本实施例中，通过设置保险管F增加AC-DC变换电路的安全性。
本实施例中，AC-DC变换器的工作原理如下：
当AC-DC变换电路101的输出端发生短路时，变压器T1的初级线圈上电流发生较大变化，在初级线圈产生感应电压U1，从而变压器T1次级线圈产生感应电压U2，若U2大于第一阈值(第一阈值即第一稳压管D1的击穿电压)，则第一稳压管D1被击穿，加在分压电阻R1和R2上的电压为U2-Vd(Vd为第一稳压管电压)，从而第一电阻R1和第二电阻R2之间的分压Uc＝(U2-Vd)*R2/(R1+R2)。该分压UC被提供给控制芯片MCU，若分压UC大于第二阈值(该第二阈值在控制芯片MCU中预先设定)，则判定AC-DC变换器的输出端短路(即负载短路)，控制芯片MCU输出控制信号开启高频开关管Q1，使继电器JK1的继电器线圈的第一端1的电压通过高频开关管 Q1的源极和漏极接地GND，继电器JK1的常闭触点3和公共端1连接，整流器D3的第一输入端无法接收交流电源的正极输出信号，从而关断AC-DC变换电路101的供电；若分压UC小于该第二阈值，则判定AC-DC变换器的输出端只是正常的负载电流增加。
图3示出已知的AC-DC变换器在负载短路时电流随时间变化的示意图，其中I为电流，T为时间。在该已知的AC-DC变换器中，AC-DC变换器在负载短路时，电流突然上升。
图4示出本实施例提供的AC-DC变换器在负载短路时电流随时间变化的示意图，其中I为电流，T为时间；电流I随时间T的变化趋势为一曲线，从而电流的上升时间各到延迟，给切断供电提供了缓冲时间，避免AC-DC变换器和负载端的器件受到强电流的冲击。
本公开实施例的AC-DC变换器有益效果如下：本公开实施例提供的AC-DC变换器的输出端设置有变压器，使AC-DC变换电路输出的电流经变压器的初级线圈后提供给负载，在负载短路时，变压器能够延缓AC-DC变换器的输出电流的上升，使控制电路可以在电流上升过程中、且电流并不是很强时就关断供电，从而避免强电流对器件冲击所造成的器件损坏；进一步地，变压器能够使AC-DC变换器的输出端与电压监测电路和控制电路分离，从而确保AC-DC变换器不会受到短路电流的冲击。
本公开实施例提供一种电源板，包括如实施例一提供的AC-DC变换器。
本公开实施例的电源板的有益效果如下：电源板的AC-DC变换器的输出端设置有变压器，使AC-DC变换电路输出的电流经变压器的初级线圈后提供给负载，在负载短路时，变压器能够延缓AC-DC变换器的输出电流的上升，使控制电路可以在电流上升过程中、且电流并不是很强时就关断供电，从而避免强电流对器件冲击所造成的器件损坏；进一步地，变压器能够使AC-DC变换器的输出端与电压监测电路和控制电路分离，从而确保AC-DC变换器不会受到短路电流的冲击。
本公开实施例提供一种显示装置，包括如实施例二提供的电源板。
本公开实施例的显示装置有益效果如下：电源板的AC-DC变换器的输出端设置有变压器，使AC-DC变换电路输出的电流经变压器的初级线圈后提供给负载，在负载短路时，变压器能够延缓AC-DC变换器的输出电流的上升，使控制电路可以在电流上升过程中、且电流并不是很强时就关断供电，从而 避免强电流对器件冲击所造成的器件损坏。进一步地，变压器能够使AC-DC变换器的输出端与电压监测电路和控制电路分离，从而确保AC-DC变换器不会受到短路电流的冲击。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
本申请要求于2014年8月15日递交的中国专利申请第201410404297.8号的优先权，在此全文引用该中国专利申请公开的内容作为本申请的一部分。

Claims (10)

  1. 一种AC-DC变换器，包括：
    AC-DC变换电路；
    变压器，所述变压器包括初级线圈及次级线圈，所述初级线圈的第一端耦接于所述AC-DC变换电路的正极输出端，所述初级线圈的第二端用于接负载；
    电压监测电路，其输入端耦接于所述次级线圈的第一端，所述次级线圈的第二端接地；
    控制电路，其输入端耦接于所述电压监测电路的输出端，其输出端耦接于所述AC-DC变换电路；
    其中所述电压监测电路在所述变压器的次级线圈的第一端输出的电压超过第一阈值时，输出一控制电压，所述控制电路在所述控制电压超过第二阈值时，控制所述AC-DC变换电路停止供电。
  2. 如权利要求1所述的AC-DC变换器，其中，所述AC-DC变换电路包括整流器、滤波电容及开关变换器；
    所述整流器的第一输入端接收交流电源的正极输出信号，其第二输入端接交流电源的负极输出端；其第一输出端分别接所述开关变换器输入端和所述滤波电容的正极，其第二输出端分别接所述AC-DC变换电路的负极输出端和所述滤波电容的负极；
    所述开关变换器的输出端接所述AC-DC变换电路的正极输出端。
  3. 如权利要求1或2所述的AC-DC变换器，其中，所述电压监测电路包括串接的第一稳压管、第一电阻和第二电阻；
    所述第一稳压管的正极接所述电压监测电路的输入端；
    所述第一电阻的第一端耦接于所述第一稳压管的负极，所述第二电阻的第一端耦接于所述第一电阻的第二端，所述第二电阻的第一端还接所述电压监测电路的输出端，所述第二电阻的第二端接地。
  4. 如权利要求3所述的AC-DC变换器，其中，所述电压监测电路的所述第一稳压管的正极接收到的所述变压器的所述次级线圈的第一端输出的电压超过所述第一阈值时，所述第一稳压管导通；所述第一电阻和所述第二电阻对所述第一稳压管的负极输出的电压进行分压，由所述第二电阻的第一端输出 所述控制电压。
  5. 如权利要求1-4之一所述的AC-DC变换器，其中，所述控制电路包括：
    继电器，所述继电器耦接于所述控制电路和所述AC-DC变换电路之间；
    控制芯片，所述控制芯片的信号输入端接所述控制电路的输入端；
    高频开关管，其控制端耦接于所述控制芯片的信号输出端，其源极端接所述继电器，其漏极端接地；
    第三电阻，其第一端接所述高频开关管的控制端，其第二端接地。
  6. 如权利要5所述的AC-DC变换器，其中，所述控制电路的所述控制芯片的信号输入端接收所述电压监测电路输出的所述控制电压超过第二阈值时，所述控制芯片控制所述高频开关管导通；
    导通的所述高频开关管使所述AC-DC变换电路的所述继电器动作，关断所述AC-DC变换电路的供电。
  7. 如权利要5或6所述的AC-DC变换器，其中，所述继电器包括继电器线圈、常开触点、常闭触点和公共端；所述继电器线圈的第一端通过二极管接高电平电源，所述继电器线圈的第二端接高电平电源，所述继电器的公共端接所述交流电源的正极输出端，所述继电器的常开触点接所述整流器的第一输入端；
    所述AC-DC变换器正常工作时，所述继电器的常开触点和公共端连接，所述整流器的第一输入端接收交流电源的正极输出信号；所述AC-DC变换器的负载短路时，所述继电器的常闭触点和公共端连接，所述整流器的第一输入端无法接收交流电源的正极输出信号，从而关断所述AC-DC变换电路的供电。
  8. 如权利要求5所述的AC-DC变换器，其中，所述AC-DC变换电路还包括保险管，所述保险管设置于交流电源的正极输出端和所述继电器的公共端之间。
  9. 一种电源板，其中，包括如权利要求1至8任一项所述的AC-DC变换器。
  10. 一种显示装置，其中，包括如权利要求9所述的电源板。
PCT/CN2014/092525 2014-08-15 2014-11-28 交直流变换器、电源板和显示装置 WO2016023299A1 (zh)

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