CN109982014B - Driving circuit and television - Google Patents
Driving circuit and television Download PDFInfo
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- CN109982014B CN109982014B CN201910324111.0A CN201910324111A CN109982014B CN 109982014 B CN109982014 B CN 109982014B CN 201910324111 A CN201910324111 A CN 201910324111A CN 109982014 B CN109982014 B CN 109982014B
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
Abstract
The application is suitable for the technical field of electronics, and provides a driving circuit and a television, wherein the driving circuit comprises: the switch control module is used for receiving the power supply signal output by the power supply, sequentially carrying out anti-electromagnetic interference treatment and filtering treatment on the power supply signal and controlling the on and off of the power supply signal according to an instruction input by a user; the direct-current voltage conversion module is used for receiving the power supply signal and converting the power supply signal into a first direct-current voltage signal; and the backlight driving module is used for receiving the first direct-current voltage signal and outputting a corresponding current driving signal according to the dimming control signal output by the dimming control signal source. Through carrying out anti-electromagnetic interference processing and converting the power supply signal of power supply output into the required electric current drive signal of display module, avoided the consumer in the car as a house to increase after, the TV set often receives the problem that other consumers disturbed when the during operation.
Description
Technical Field
The application belongs to the technical field of electronics, and particularly relates to a driving circuit and a television.
Background
With the development of scientific technology, on the premise that the status of a house serving as a living host and a home base is unchanged, the regional limitation of the house can be eliminated by advanced technical means, and the functions of the house are increased to adapt to the concept that people are gradually opened and the increasingly-abundant living demands. The motor home, also called as home on the wheels, has two functions of a house and a car, but the attribute of the motor home is also that the motor home is a movable car type with necessary basic facilities at home, and the home facilities on the motor home are as follows: furniture and electrical appliances such as bedding, stoves, refrigerators, cabinets, sofas, dining chairs, washing facilities, air conditioners, televisions, sounds and the like can be divided into driving areas, living areas, bedroom areas, sanitary areas, kitchen areas and the like, and the caravan is a fashion product integrating clothes, eating, living and traveling into a whole, and realizing traveling in life and living in traveling.
However, the television in the motor home is usually powered by direct-current voltage, and after the electric equipment in the motor home is increased, the television is often interfered by other electric equipment during working, so that the normal life of a user is affected.
Disclosure of Invention
The application aims to provide a driving circuit and a television, and aims to solve the problem that the television in a motor home is usually powered by direct-current voltage, and after electric equipment in the motor home is increased, the television is often interfered by other electric equipment when in operation, so that the normal life of a user is influenced.
The embodiment of the application provides a driving circuit which is connected with a power supply, a dimming control signal source and a display module, and comprises:
the switch control module is connected with the power supply, receives a power supply signal output by the power supply, sequentially performs anti-electromagnetic interference treatment and filtering treatment on the power supply signal, and controls the on and off of the power supply signal according to an instruction input by a user;
the direct-current voltage conversion module is connected with the switch control module and is used for receiving the power supply signal and converting the power supply signal into a first direct-current voltage signal; and
and the backlight driving module is connected with the direct-current voltage conversion module, the dimming control signal source and the display module, receives the first direct-current voltage signal and outputs a corresponding current driving signal according to the dimming control signal output by the dimming control signal source.
Optionally, the driving circuit further includes:
and the universal power supply module is connected with the direct-current voltage conversion module, receives the first direct-current voltage signal and converts the first direct-current voltage signal into a second direct-current voltage signal.
Optionally, the switch control module includes:
an anti-electromagnetic interference unit connected with the power supply and used for performing anti-electromagnetic interference treatment on the power supply signal;
the switch unit is connected with the anti-electromagnetic interference unit and used for controlling the on and off of the power supply signal; and
and the first filtering unit is connected with the switch unit and is used for filtering the power supply signal.
Optionally, the driving circuit is further connected with an acoustic signal source, and the switch control module further includes:
and the sound control unit is connected with the sound signal source and connected with the switch unit in parallel, receives a sound control signal output by the sound signal source, and controls the on and off of the power signal according to the sound control signal.
Optionally, the switch control module further includes:
and the overload protection unit is arranged between the power supply and the anti-electromagnetic interference unit and used for carrying out overload protection on the driving circuit.
Optionally, the direct current voltage conversion module includes:
the voltage conversion unit is connected with the switch control module, receives the power supply signal and converts the power supply signal into the first direct-current voltage signal;
And the interference suppression unit is connected with the voltage conversion unit, receives the first direct-current voltage signal and performs anti-interference processing on the first direct-current voltage signal.
Optionally, the backlight driving module includes:
the driving control unit is connected with the direct-current voltage conversion module and the dimming control signal source, receives the dimming control signal and outputs a corresponding driving control signal according to the dimming control signal;
the boost unit is connected with the drive control unit, receives the drive control signal, and performs boost processing on the drive control signal so as to output a corresponding current drive signal;
the voltage detection unit is connected with the voltage boosting unit and the driving control unit and is used for sampling the current driving signal so as to output a corresponding voltage detection signal to the driving control unit; and
and the current detection unit is connected with the display module and is used for detecting the working current signal output by the display module so as to output a corresponding current detection signal.
The embodiment of the application also provides a television, which comprises:
a power supply;
a dimming control signal source;
a display module; and
The driving circuit according to any one of the preceding claims, wherein the driving circuit is connected to the power supply, the dimming control signal source, and the display module
The embodiment of the application provides a driving circuit and a television, wherein the driving circuit comprises: the switch control module is used for receiving the power supply signal output by the power supply, sequentially carrying out anti-electromagnetic interference treatment and filtering treatment on the power supply signal and controlling the on and off of the power supply signal according to an instruction input by a user; the direct-current voltage conversion module is used for receiving the power supply signal and converting the power supply signal into a first direct-current voltage signal; and the backlight driving module is used for receiving the first direct-current voltage signal and outputting a corresponding current driving signal according to the dimming control signal output by the dimming control signal source. Through carrying out anti-electromagnetic interference processing and converting the power supply signal of power supply output into the required electric current drive signal of display module, avoided the consumer in the car as a house to increase after, the TV set often receives the problem that other consumers disturbed when the during operation.
Drawings
Fig. 1 is a schematic diagram of a driving circuit according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a driving circuit according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a switch control module 20 according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a switch control module 20 according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a switch control module 20 according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a switch control module 20 according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a dc voltage conversion module 30 according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a dc voltage conversion module 30 according to another embodiment of the present application;
fig. 9 is a schematic structural diagram of a backlight driving module 40 according to an embodiment of the present application;
fig. 10 is a schematic structural view of a drive control unit 41 provided in one embodiment of the present application;
fig. 11 is a schematic structural diagram of a universal power supply module 50 according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are directions or positions based on the drawings, and are merely for convenience of description and are not to be construed as limiting the present technical solution. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In order to explain the technical scheme of the application, the following is a detailed description with reference to the specific drawings and embodiments.
Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present application, referring to fig. 1, the driving circuit in the present embodiment is connected to a power supply 11, a dimming control signal source 12 and a display module 13, and the driving circuit includes:
The switch control module 20 is connected with the power supply 11, receives a power supply signal output by the power supply 11, sequentially performs anti-electromagnetic interference treatment and filtering treatment on the power supply signal, and controls on and off of the power supply signal according to an instruction input by a user;
a dc voltage conversion module 30 connected to the switch control module 20, for receiving the power signal and converting the power signal into a first dc voltage signal; and
and a backlight driving module 40 connected to the dc voltage conversion module 30, the dimming control signal source 12, and the display module 13, receiving the first dc voltage signal, and outputting a corresponding current driving signal according to the dimming control signal output from the dimming control signal source 12.
In this embodiment, the switch control module 20 filters clutter from the power signal output by the power supply 11, isolates mutual interference of other electric devices, and avoids interference of other electric devices in the caravan to the operation of the display module 13 at the rear end. The dc voltage conversion module 30 converts the power signal into a first dc voltage signal required by the display, and the backlight driving module 40 outputs a corresponding current driving signal to drive the display module 13 to operate when receiving the dimming control signal output by the dimming control signal source 12.
In one embodiment, referring to fig. 2, the driving circuit in this embodiment further includes:
and a universal power supply module 50 connected to the dc voltage conversion module 30, receiving the first dc voltage signal, and converting the first dc voltage signal into a second dc voltage signal.
In the present application, the universal power supply module 50 converts the first dc voltage signal into the second dc voltage signal to supply power to the universal device in the caravan, for example, a universal USB power supply may be provided by the universal power supply module 50 to supply power to the mobile terminal such as the mobile phone.
In one embodiment, referring to fig. 3, the switch control module 20 includes:
an anti-electromagnetic interference unit 21 connected to the power supply 11 and configured to perform anti-electromagnetic interference processing on the power supply signal;
a switch unit 22 connected to the anti-electromagnetic interference unit 21 and controlling on/off of the power signal; and
and a first filter unit 23 connected to the switch unit 22 and performing a filter process on the power supply signal.
In this embodiment, the anti-electromagnetic interference unit 21 performs filtering processing and electromagnetic interference signal isolation processing on the power supply signal, so that signal interference of other electric equipment on the driving circuit is prevented from the power supply end, the switch unit 22 can control on and off of the power supply signal according to the instruction input by the user, thereby realizing switch control on the driving circuit, thoroughly cutting off power supply of the television when not in use, achieving the purpose of standby zero power, and still performing isolation processing on the signal through the anti-electromagnetic interference unit 21 when the driving circuit is in standby, and the first filter unit 23 is used for performing filtering processing on the power supply signal.
In one embodiment, referring to fig. 4, the driving circuit is further connected to the acoustic signal source 14, and the switch control module 20 further includes:
and an acoustic control unit 24 connected to the acoustic signal source 14 and connected in parallel with the switching unit, for receiving an acoustic control signal outputted from the acoustic signal source 14 and controlling on/off of the power signal according to the acoustic control signal.
In this embodiment, the audio control signal may control on and off of the power signal, for example, when the audio is powered on, the audio control signal output by the audio signal source 14 is at a high level, the audio control unit 24 turns on the power signal, and when the audio is powered off, the audio control signal output by the audio signal source 14 is at a low level, the audio control unit 24 turns off the power signal, so as to realize on and off control of the audio control signal on the power signal.
In one embodiment, the audio signal source 14 may be an audio device or a control device for an audio device that is coupled to a drive circuit to control the power supply system of the television set from a chip on the audio device.
In one embodiment, referring to fig. 5, the switch control module 20 further includes:
And an overload protection unit 25 provided between the power supply 11 and the electromagnetic interference resisting unit 21 for overload protection of the driving circuit.
In one embodiment, referring to fig. 6, the overload protection unit 25 includes a fuse F1, a first end of the fuse F1 is connected to the power supply 11, and a second end of the fuse F1 is connected to the anti-electromagnetic interference unit 21.
In one embodiment, referring to fig. 6, the anti-electromagnetic interference unit 21 in the present embodiment includes a first diode D1, a varistor RV1, a first capacitor C1, a first safety capacitor CY1, a second safety capacitor CY2, a third safety capacitor CY3, a fourth safety capacitor CY4, a second capacitor C2, a first inductor L1, and a second inductor L2;
the cathode of the first diode D1, the first end of the varistor RV1, the first end of the first capacitor C1, the first end of the first safety capacitor CY1, the first end of the first inductor L1 and the first end of the second inductor L2 are commonly connected to the first end of the anti-electromagnetic interference unit 21, the second end of the first safety capacitor CY1 and the first end of the second safety capacitor CY2 are commonly connected to the ground, the second end of the first inductor L1, the second end of the second inductor L2, the first end of the third safety capacitor CY3 and the first end of the second capacitor C2 are commonly connected to the second end of the anti-electromagnetic interference unit 21, the second end of the third safety capacitor CY3 and the first end of the fourth safety capacitor CY4 are commonly connected to the ground, and the anode of the first diode D1, the second end of the varistor RV1, the second end of the third safety capacitor CY3, the second end of the fourth safety capacitor CY4 and the second end of the second capacitor C2 are commonly connected to the ground.
In one embodiment, referring to fig. 6, the switch unit 22 in this embodiment includes a first switch K1, a first end of the first switch K1 is connected to the anti-electromagnetic interference unit 21, and a second end of the first switch K1 is connected to the first filter unit 23.
In one embodiment, referring to fig. 6, the acoustic control unit 24 in this embodiment includes: the first switching tube Q1, the second switching tube Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the third capacitor C3 and the fourth capacitor C4;
the first end of the second resistor R2, the first end of the third capacitor C3 and the current input end of the first switching tube Q1 are commonly connected to the anti-electromagnetic interference unit 21, the current output end of the first switching tube Q1 is connected to the first filtering unit 23, the second end of the second resistor R2, the second end of the third capacitor C3, the control end of the first switching tube Q1 and the first end of the fourth resistor R4 are commonly connected, the second end of the fourth resistor R4 is connected to the current input end of the second switching tube Q2, the control end of the second switching tube Q2, the first end of the first resistor R1, the first end of the third resistor R3 and the first end of the fourth capacitor C4 are commonly connected, the current output end of the second switching tube Q2, the second end of the third resistor R3 and the second end of the fourth capacitor C4 are commonly connected to the ground, and the first acoustic source 14 is connected to the first acoustic source 14.
In one embodiment, the first switching tube Q1 may be a P-type MOS tube or a PNP-type triode, and specifically, a connection mode of the first switching tube Q1 is set according to needs, for example, when the first switching tube Q1 is a P-type MOS tube, a source electrode of the P-type MOS tube is a current input end of the first switching tube Q1, a gate electrode of the P-type MOS tube is a control end of the first switching tube Q1, and a drain electrode of the P-type MOS tube is a current output end of the first switching tube Q1.
In one embodiment, the second switching tube Q2 may be an NPN-type triode or an N-type MOS tube, and specifically, a connection manner of the second switching tube Q2 is set according to needs, for example, when the second switching tube Q2 is an NPN-type triode, a collector of the NPN-type triode is a current input end of the second switching tube Q2, an emitter of the NPN-type triode is a current output end of the second switching tube Q2, and a base of the NPN-type triode is a control end of the second switching tube Q2.
In this embodiment, when the audio control signal output by the audio signal source 14 is at a high level, a voltage division signal is obtained by dividing the voltage by the first resistor R1 and the third resistor R3, the second switching tube Q2 is driven by the voltage division signal, at this time, the second switching tube Q2 is turned on, the voltage of the control end of the first switching tube Q1 is pulled down, so that the first switching tube Q1 is turned on to realize the conduction of the power signal, and conversely, when the audio control signal output by the audio signal source 14 is at a low level, the second switching tube Q2 is turned off, at this time, the control end of the first switching tube Q1 is at a high level, and the first switching tube Q1 is turned off to realize the turn-off of the power signal.
In one embodiment, referring to fig. 6, the first filtering unit 23 includes: a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8;
the first end of the fifth capacitor C5, the first end of the sixth capacitor C6, the first end of the seventh capacitor C7, and the first end of the eighth capacitor C8 are commonly connected to the switch unit 22, and the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, the second end of the seventh capacitor C7, and the second end of the eighth capacitor C8 are commonly grounded.
In one embodiment, referring to fig. 7, the dc voltage conversion module 30 includes:
a voltage conversion unit 31 connected to the switch control module 20, receiving the power supply signal, and converting the power supply signal into the first direct current voltage signal;
and an interference suppression unit 32 connected to the voltage conversion unit, receiving the first direct-current voltage signal, and performing anti-interference processing on the first direct-current voltage signal.
In one embodiment, referring to fig. 8, the voltage converting unit 31 in the present embodiment includes: the voltage-transformation control chip U1, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the twenty-first resistor R21, the twenty-second resistor R22, the twenty-third resistor R23, the twenty-fourth resistor R24, the second diode D2A third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth capacitor D9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, a sixth switching tube Q6, a photo coupler photo receiver U2A, and a transformer T1;
The anode of the third diode D3, the first end of the twentieth resistor R20, the first end of the twenty-first resistor R21, the first end of the twenty-second resistor R22, the first end of the twenty-third resistor R23, the first end of the twenty-fourth resistor R24, the first end of the eighteenth capacitor C18 and the first input end of the transformer T1 are commonly connected to the switch control module 20, the cathode of the third diode D3 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7, the cathode of the second diode D2, the first end of the twelfth capacitor C12, the first end of the thirteenth capacitor C13, the first end of the eighth resistor R8, the anode of the fourth diode D4 and the power end of the transformer control chip U1 are commonly connected to the first common ground, the soft start signal end SS of the transformer chip U1, the first end of the ninth capacitor C9 and the first end of the tenth capacitor C10 are commonly connected, the oscillation signal end RT of the transformer chip U1, the first end of the fifth resistor R5 and the first end of the sixth resistor R6 are commonly connected, the feedback signal end FB of the transformer chip U1, the first end of the sixteenth resistor R16, the first end of the fifteenth capacitor C15 and the first end of the seventeenth resistor R17 are commonly connected, the second end of the sixteenth resistor R16 is connected with a first common ground, the second end COMP of the fifteenth capacitor C15 is connected with the first end of the photoelectric coupler light receiver U2B, the second end of the photoelectric coupler light receiver U2B, the ground end GND of the transformer chip U1, the second end of the fifth resistor R5, the second end of the sixth resistor R6, the second end of the ninth capacitor C9 and the tenth capacitor C10 are commonly connected with the first common ground, the over-current signal protection terminal ISENSE of the transformer chip U1, the first terminal of the fourteenth capacitor C14, the first terminal of the fifteenth resistor R15 and the second terminal of the eighth resistor R8 are commonly connected, the driving signal terminal GATE of the transformer chip U1 is connected with the first terminal of the ninth resistor R9, the second terminal of the fourteenth capacitor C14 is connected with the first common ground terminal, the second terminal of the ninth resistor R9, the first terminal of the tenth resistor R10, the control terminal of the third switch tube Q3 and the control terminal of the fourth switch tube Q4 are commonly connected, the current output terminal of the fourth switch tube Q4 is connected with the first common ground terminal, the cathode of the fourth diode D2 is connected with the current input terminal of the third switch tube Q3, the second terminal of the third switch tube Q3, the current input terminal of the fourth switch tube Q4, the first terminal of the eleventh resistor R11, the cathode of the fifth diode D5, the first terminal of the twelfth resistor R12 and the cathode of the sixth diode D6 are commonly connected, the second end of the eleventh resistor R11, the anode of the fifth diode D5, the first end of the thirteenth resistor R13, and the control end of the fifth diode D5 are commonly connected, the second end of the twelfth resistor R12, the anode of the sixth diode D6, the first end of the fourteenth resistor R14, and the control end of the sixth switching tube Q6 are commonly connected, the second end of the thirteenth resistor R13, the current input end of the fifth switching tube Q5, the first end of the seventeenth capacitor C17, the current input end of the sixth switching tube Q6, the second end of the fourteenth resistor R14, the second end of the fifteenth resistor R15, the first end of the eighteenth resistor R18, the first end of the nineteenth resistor R19, and the first end of the sixteenth capacitor C16 are commonly connected, the second end of the sixteenth capacitor C16, the current output end of the fifth switching tube Q5, the current output end of the sixteenth switching tube Q6, the second end of the seventeenth capacitor C17, the anode of the eighth diode D8 and the second input end of the transformer T1 are commonly connected, the second end of the eighteenth resistor R18 and the second end of the nineteenth resistor R19 are commonly connected to the first common ground, the second end of the seventeenth resistor R17 is connected to the cathode of the seventh diode D7, the anode of the seventh diode D7 is connected to the third input end of the transformer T1, the fourth input end of the transformer T1 is connected to the first common ground, the second output end of the transformer T1 and the fourth output end of the transformer T1 are connected to the second common ground, and the first output end and the third output end of the transformer T1 are connected to the interference suppression unit 32.
In one embodiment, the third switching transistor Q3 is an NPN-type transistor, a collector of the NPN-type transistor is a current input end of the third switching transistor Q3, an emitter of the NPN-type transistor is a current output end of the third switching transistor Q3, and a base of the NPN-type transistor is a control end of the third switching transistor Q3.
In one embodiment, the fourth switching transistor Q4 is a PNP type transistor, an emitter of the PNP type transistor is a current input terminal of the fourth switching transistor Q4, a collector of the PNP type transistor is a current output terminal of the fourth switching transistor Q4, and a base of the PNP type transistor is a control terminal of the fourth switching transistor Q4.
In one embodiment, the fifth switching tube Q5 and the sixth switching tube Q6 are N-type MOS tubes.
In one embodiment, the model of the variable-voltage control chip U1 may be an MSP serial chip.
In one embodiment, referring to fig. 8, the interference suppression unit 32 includes: a ninth diode D9, a tenth diode D10, an eleventh diode D11, a twelfth diode D12, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-seventh resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a third inductance L3, a photocoupler light emitter U2A, a voltage regulator chip U2, a nineteenth capacitor C19, a twenty-fifth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a thirty-third capacitor C30, a sixteenth capacitor C61, a sixteenth capacitor C62, and a common mode inductance T2;
The anode of the ninth diode D9, the anode of the twelfth diode D10, the anode of the eleventh diode D11, the first end of the thirty-second resistor R32, the first end of the thirty-third resistor R33, the anode of the twelfth diode D12, the first end of the thirty-fourth resistor R34, and the first end of the thirty-fifth resistor R35 are commonly connected to the voltage conversion unit 31, the cathode of the ninth diode D9, the cathode of the twelfth diode D10, the cathode of the eleventh diode D11, the first end of the nineteenth capacitor C19, the first end of the twentieth capacitor C20, the first end of the twenty-first capacitor C21, the first end of the twenty-second capacitor C22, and the first end of the third inductor L3 are commonly connected, the second end of the thirty-second resistor R32, the second end of the thirty-third resistor R33, and the second end of the nineteenth capacitor C19 are commonly connected, the second end of the third inductor L3, the first end of the twenty-third capacitor C23, the first end of the thirty-first resistor R31, and the twenty-fourth capacitor C24 are commonly connected to the backlight driving module 40, the second end of the twenty-first capacitor C20, the second end of the twenty-first capacitor C21, the second end of the twenty-second capacitor C22, the second end of the twenty-third capacitor C23, the second end of the thirty-first resistor R31, and the second end of the twenty-fourth capacitor C24 are connected to a second common ground, the cathode of the twelfth diode D12, the first end of the twenty-fifth capacitor C25, the first end of the twenty-sixth capacitor C26, the first end of the twenty-seventh capacitor C27, the first end of the twenty-eighth capacitor C28, the first end of the thirty-fourth resistor R30, the first end of the thirty-sixth resistor R36, and the first end of the common-mode inductor T2 are commonly connected, the second end of the thirty-fourth resistor R34, the second end of the thirty-fifth resistor R35, and the second end of the twenty-fifth capacitor C25 are commonly connected, the second end of the twenty-sixth capacitor C26, the second end of the twenty-seventh capacitor C27, the second end of the twenty-eighth capacitor C28, the second end of the thirty-sixth resistor R30 and the second end of the common-mode inductor T1 are commonly connected, the second end of the thirty-sixth resistor R36, the first end of the photo-coupler light emitter U2A and the first end of the twenty-fifth resistor R25 are commonly connected, the second end of the photo-coupler light emitter U2A, the second end of the twenty-fifth resistor R25, the first end of the sixty-capacitor C60, the first end of the sixty-second capacitor C62 and the cathode end of the voltage stabilizing chip U2 are commonly connected, the second end of the sixty-second capacitor C62 is connected with the first end of the twenty-sixth resistor R26, the second end of the sixty-first capacitor C61, the second end of the twenty-sixth resistor R26, the control end of the voltage stabilizing chip U1, the first end of the twenty-seventh resistor R27, the first end of the twenty-ninth resistor R29 and the first end of the thirty-seventh resistor R30 are commonly connected, the anode end of the voltage stabilizing chip U1, the second end of the twenty-seventh resistor R27 and the second end of the thirty-seventh resistor R30 are commonly connected to the second common ground, the second end of the twenty-ninth resistor R29 is connected to the first end of the twenty-eighth resistor R28, the third end of the common mode inductor T1, the second end of the twenty-eighth resistor R28, the first end of the twenty-ninth capacitor C29 and the first end of the thirty-ninth capacitor C30 are commonly connected to the backlight driving module 40, and the fourth end of the common mode inductor T1, the second end of the twenty-ninth capacitor C29 and the second end of the thirty-eighth capacitor C30 are commonly connected to the second common ground.
In one embodiment, the voltage regulator chip is model TL431.
In one embodiment, referring to fig. 9, the backlight driving module 40 includes:
a driving control unit 41 connected to the dc voltage conversion module 30 and the dimming control signal source 12, receiving the dimming control signal, and outputting a corresponding driving control signal according to the dimming control signal;
a booster unit 42 connected to the drive control unit 41, receiving the drive control signal, and boosting the drive control signal to output a corresponding current drive signal;
a voltage detection unit 43 connected to the voltage boosting unit 42 and the drive control unit 41, for sampling the current drive signal to output a corresponding voltage detection signal to the drive control unit 41; and
and a current detection unit 44 connected to the display module 13 for detecting the operation current signal outputted from the display module 13 to output a corresponding current detection signal.
In this embodiment, the driving control unit 41 outputs a corresponding driving control signal according to the dimming control signal, and performs a boosting process on the driving control signal by using the boosting unit 42 to output a corresponding current driving signal, the voltage detecting unit 43 samples the current driving signal to output a corresponding voltage detecting signal to the driving control unit 41, and the current detecting unit 44 detects the operating current signal output by the display module 13 to output a corresponding current detecting signal, so that the current driving signal is kept within a set range, and the display circuit at the rear end is prevented from being burned.
In one embodiment, referring to fig. 10, the drive control unit 41 in this embodiment includes: a driving control chip U3, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, and a thirteenth diode D13;
the pulse width modulation signal input end PWM, the first end of the thirty-third resistor R33 and the anode of the thirteenth diode D13 of the driving control chip U3 are commonly connected, the cathode of the thirteenth diode D13 and the second end of the thirty-third resistor R33 are commonly connected to the dimming control signal source 12, the compensation signal end CMP of the driving control chip U3 is connected to the first end of the thirty-fourth resistor R34, the second end of the thirty-fourth resistor R34 is connected to the first end of the thirty-third capacitor C33, the ground end of the driving control chip U3 is commonly connected to the second end of the thirty-third capacitor C33, the power supply end of the driving control chip U3, the first end of the thirty-second resistor R32, the first end of the thirty-first capacitor C31 and the first end of the thirty-second capacitor C32 are commonly connected to the ground, the driving signal end GATE and the oscillation signal end CS of the driving control chip U3 are connected to the boost unit 42, the voltage protection signal end p of the driving control chip U3 is connected to the voltage detection unit 43, and the overvoltage detection unit 44 is connected to the overvoltage detection unit.
In one embodiment, the dimming control signal source 12 may output not only the dimming control signal but also the enable signal, and the operating state of the driving control chip U3 is controlled by controlling the level of the enable signal.
In one embodiment, referring to fig. 10, the boosting unit 42 includes: a fourteenth diode D14, a fifteenth diode D15, a sixteenth diode D16, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a forty resistor R40, a forty-first resistor R41, a forty-second resistor R42, a forty-third resistor R43, a forty-fourth resistor R44, a forty-fifth resistor R45, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, a seventh switching tube Q7, and a fourth inductor L4;
the cathode of the fourteenth diode D14 and the first end of the thirty-seventh resistor R37 are commonly connected to the driving control signal output end of the driving control unit 41, the anode of the fourteenth diode D14 is commonly connected to the first end of the thirty-sixth resistor R36, the second end of the thirty-eighth resistor R37, the first end of the thirty-eighth resistor R38 and the control end of the seventh switching transistor Q7, the first end of the thirty-eighth resistor R38, the first end of the fortieth second resistor R42, the first end of the fortieth third resistor R43, the current output end of the fortieth fourth resistor R44, the first end of the fortieth fifth resistor R45, the current output end of the seventieth switching transistor Q7 and the first end of the thirty-fifth capacitor C35 are commonly connected to the driving control unit 41, the second end of the thirty-fourth resistor C34 is commonly connected to the ground, the second end of the fortieth resistor R38, the first end of the fortieth resistor R42, the fourth resistor R4, the fourth end of the fortieth resistor R35, the fourth resistor R4, the fourth end of the fortieth resistor R4, the current output end of the fortieth resistor R45, the current output end of the fortieth resistor R35, the thirty-fifth resistor C35 are commonly connected to the fourth end of the fortieth resistor R4, the thirty-fifth resistor R45, the current output end of the thirty-fifth resistor R, the cathode of the sixteenth diode D16 and the second terminal of the thirty-sixth capacitor C36 are commonly connected to the voltage detecting unit 43.
In one embodiment, the seventh switching tube Q7 may be an N-type MOS tube.
In one embodiment, referring to fig. 10, the voltage detection unit 43 in the present embodiment includes: forty-sixth resistor R46, forty-seventh resistor R47, forty-eighth resistor R48, forty-ninth resistor R49, and thirty-seventh capacitor C37;
the first end of the forty-sixth resistor R46 is connected to the voltage boosting unit 42, the second end of the forty-sixth resistor R46 is connected to the forty-seventh resistor R47, the second end of the forty-seventh resistor R47, the first end of the forty-eighth resistor R48, the first end of the forty-ninth resistor R49, and the first end of the thirty-seventh capacitor C37 are commonly connected, the second end of the forty-ninth resistor R49 is connected to the voltage detection signal input end of the drive control unit 41, and the second end of the forty-eighth resistor R48 is commonly grounded to the second end of the thirty-seventh capacitor C37.
In one embodiment, referring to fig. 10, the current detection unit 44 in this embodiment includes: a fifty-first resistor R51, a fifty-second resistor R52, a fifty-third resistor R53, a fifty-fourth resistor R54, a fifty-fifth resistor R55, a fifty-sixth resistor R56, and a seventeenth diode D17;
the first end of the fifty-first resistor R51 is connected to the current detection signal input terminal of the drive control unit 41, the second end of the fifty-first resistor R51, the anode of the seventeenth diode D17, the first end of the fifty-second resistor R52, the first end of the fifty-third resistor R53, the first end of the fifty-fourth resistor R54, the first end of the fifty-fifth resistor R55, and the first end of the fifty-sixth resistor R56 are commonly connected to the display module 13, and the cathode of the seventeenth diode D17, the second end of the fifty-second resistor R52, the second end of the fifty-third resistor R53, the second end of the fifty-fourth resistor R54, the second end of the fifty-fifth resistor R55, and the second end of the fifty-sixth resistor R56 are commonly connected to ground.
In one embodiment, referring to fig. 10, the backlight driving module 40 further includes: and a second filter unit 45 for performing a careful filtering process on the current drive signal.
In one embodiment, referring to fig. 10, the second filtering unit 45 includes: thirty-eighth capacitor C38, thirty-ninth capacitor C39, fortieth capacitor C40, and fifty-first resistor R50;
the first end of the thirty-eighth capacitor C38, the first end of the thirty-ninth capacitor C39, the first end of the fortieth capacitor C40, and the first end of the fifty-first resistor R50 are commonly connected to the boost unit 42, and the second end of the thirty-eighth capacitor C38, the second end of the thirty-ninth capacitor C39, the second end of the fortieth capacitor C40, and the second end of the fifty-first resistor R50 are commonly connected to ground.
In one embodiment, referring to fig. 11, the universal power module 50 includes: the voltage conversion chip U4, the forty-first capacitor C41, the forty-second capacitor C42, the forty-third capacitor C43, the forty-fourth capacitor C44, the forty-fifth capacitor C45, the forty-sixth capacitor C46, the forty-seventh capacitor C47, the fifty-seventh resistor R57, the fifty-eighth resistor R58, the fifty-ninth resistor R59, the sixty resistor R60, the fifth inductor L5, and the power supply terminal JP3;
The first end of the forty first capacitor C41, the first end of the fifty-seventh resistor R57 and the current input end IN of the voltage conversion chip U4 are commonly connected, the second end of the forty first capacitor C41 is grounded, the enable signal end EN of the voltage conversion chip U4 is connected with the second end of the fifty-seventh resistor R57, the oscillation signal end BS of the voltage conversion chip U4 is connected with the first end of the forty third capacitor C43, the conversion signal end SW of the voltage conversion chip U4, the first end of the fifth inductor L5, the second end of the forty third capacitor C43 and the cathode of the eighteenth diode D18 are commonly connected, the compensation signal end COMP of the forty fourth capacitor C44, the first end of the forty fifth capacitor C45 and the first end of the forty-fifth capacitor C44 are commonly connected, the soft start signal end SS of the conversion chip U4 is connected with the first end of the forty second capacitor C42, the second end of the forty second capacitor C42, the forty end of the forty fourth capacitor C4, the sixty resistor R5 and the sixty-fifth capacitor C46 are commonly connected with the first end of the forty-fifth resistor R58, the forty-fifth capacitor C4 and the sixty-fifth end of the forty-fifth capacitor C46 are commonly connected with the cathode of the forty-fifth capacitor C18, the forty-eighth resistor C60 and the forty-eighth resistor C5 are commonly connected with the first end of the forty-eighth resistor C4.
The embodiment of the application also provides a television, which comprises:
a power supply;
a dimming control signal source;
a display module; and
the driving circuit according to any one of the preceding claims, wherein the driving circuit is connected to the power supply, the dimming control signal source, and the display module
The embodiment of the application provides a driving circuit and a television, wherein the driving circuit comprises: the switch control module is used for receiving the power supply signal output by the power supply, sequentially carrying out anti-electromagnetic interference treatment and filtering treatment on the power supply signal and controlling the on and off of the power supply signal according to an instruction input by a user; the direct-current voltage conversion module is used for receiving the power supply signal and converting the power supply signal into a first direct-current voltage signal; and the backlight driving module is used for receiving the first direct-current voltage signal and outputting a corresponding current driving signal according to the dimming control signal output by the dimming control signal source. Through carrying out anti-electromagnetic interference processing and converting the power supply signal of power supply output into the required electric current drive signal of display module, avoided the consumer in the car as a house to increase after, the TV set often receives the problem that other consumers disturbed when the during operation.
The above description is illustrative of the various embodiments of the application and is not intended to be limiting, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (7)
1. A driving circuit connected to a power supply, a dimming control signal source, and a display module, the driving circuit comprising:
the switch control module is connected with the power supply, receives a power supply signal output by the power supply, sequentially performs anti-electromagnetic interference treatment and filtering treatment on the power supply signal, and controls the on and off of the power supply signal according to an instruction input by a user;
the direct-current voltage conversion module is connected with the switch control module and is used for receiving the power supply signal and converting the power supply signal into a first direct-current voltage signal; and
the backlight driving module is connected with the direct-current voltage conversion module, the dimming control signal source and the display module, receives the first direct-current voltage signal and outputs a corresponding current driving signal according to the dimming control signal output by the dimming control signal source;
The switch control module includes:
an anti-electromagnetic interference unit connected with the power supply and used for performing anti-electromagnetic interference treatment on the power supply signal;
the switch unit is connected with the anti-electromagnetic interference unit and used for controlling the on and off of the power supply signal according to a user input instruction; and
the first filtering unit is connected with the switch unit and is used for filtering the power supply signal;
the drive circuit is still connected with the stereo set signal source, the switch control module still includes:
the sound control unit is connected with the sound signal source and connected with the switch unit in parallel, receives a sound control signal output by the sound signal source, and controls the on and off of the power signal according to the sound control signal;
the sound control unit includes: the first resistor is connected with the first resistor and the second resistor;
the first end of the second resistor, the first end of the third capacitor and the current input end of the first switch tube are commonly connected to the anti-electromagnetic interference unit, the current output end of the first switch tube is connected to the first filtering unit, the second end of the second resistor, the second end of the third capacitor, the control end of the first switch tube and the first end of the fourth resistor are commonly connected, the second end of the fourth resistor is connected to the current input end of the second switch tube, the control end of the second switch tube, the first end of the first resistor, the first end of the third resistor and the first end of the fourth capacitor are commonly connected, the current output end of the second switch tube, the second end of the third resistor and the second end of the fourth capacitor are commonly connected to the ground, and the second end of the first resistor is connected to the acoustic signal source.
2. The drive circuit of claim 1, wherein the drive circuit further comprises:
and the universal power supply module is connected with the direct-current voltage conversion module, receives the first direct-current voltage signal and converts the first direct-current voltage signal into a second direct-current voltage signal.
3. The drive circuit of claim 1, wherein the switch control module further comprises:
and the overload protection unit is arranged between the power supply and the anti-electromagnetic interference unit and used for carrying out overload protection on the driving circuit.
4. The drive circuit of claim 1, wherein the dc voltage conversion module comprises:
the voltage conversion unit is connected with the switch control module, receives the power supply signal and converts the power supply signal into the first direct-current voltage signal;
and the interference suppression unit is connected with the voltage conversion unit, receives the first direct-current voltage signal and performs anti-interference processing on the first direct-current voltage signal.
5. The driving circuit of claim 1, wherein the backlight driving module comprises:
the driving control unit is connected with the direct-current voltage conversion module and the dimming control signal source, receives the dimming control signal and outputs a corresponding driving control signal according to the dimming control signal;
The boost unit is connected with the drive control unit, receives the drive control signal, and performs boost processing on the drive control signal so as to output a corresponding current drive signal;
the voltage detection unit is connected with the voltage boosting unit and the driving control unit and is used for sampling the current driving signal so as to output a corresponding voltage detection signal to the driving control unit; and
and the current detection unit is connected with the display module and is used for detecting the working current signal output by the display module so as to output a corresponding current detection signal.
6. The driving circuit according to claim 1, wherein the switching unit includes: the first end of the first switch is connected with the anti-electromagnetic interference unit, and the second end of the first switch is connected with the first filtering unit.
7. A television set, comprising:
a power supply;
a dimming control signal source;
a display module; and
the drive circuit of any one of claims 1-6, wherein the drive circuit is coupled to the power supply, the dimming control signal source, and the display module.
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| CN201910324111.0A CN109982014B (en) | 2019-04-22 | 2019-04-22 | Driving circuit and television |
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| CN201910324111.0A CN109982014B (en) | 2019-04-22 | 2019-04-22 | Driving circuit and television |
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| CN109982014B true CN109982014B (en) | 2023-09-29 |
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| CN112556988B (en) * | 2020-12-02 | 2023-09-26 | 海信视像科技股份有限公司 | Display device and detection circuit thereof |
| CN113110125B (en) * | 2021-03-15 | 2022-04-01 | 三门康创电子科技有限公司 | Fruit and vegetable machine control circuit, fruit and vegetable machine and fruit and vegetable machine control method |
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