CN110266198A - The power circuit of temperature control liquid crystal screen controller - Google Patents
The power circuit of temperature control liquid crystal screen controller Download PDFInfo
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- CN110266198A CN110266198A CN201910593673.5A CN201910593673A CN110266198A CN 110266198 A CN110266198 A CN 110266198A CN 201910593673 A CN201910593673 A CN 201910593673A CN 110266198 A CN110266198 A CN 110266198A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 58
- 238000004804 winding Methods 0.000 claims description 66
- 230000005669 field effect Effects 0.000 claims description 52
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/79—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of power circuit of temperature control liquid crystal screen controller, including the electronic switching circuit being connect with firewire, the rectifier bridge being connect with electronic switching circuit and zero curve, the filter capacitor being connect with rectifier bridge, the start triggering circuit being connect with rectifier bridge, the half bridge converter being all connected with the first output end, second output terminal and the start triggering circuit of rectifier bridge, and the magnetic core isolated buck transformer being all connected with the first output end and second output terminal of half bridge converter.So by the firewire of the direct current of output and completely isolated, the remote controlled alternating current of alternating current, raising safety.
Description
Technical field
The present invention relates to temperature controller technical field, especially a kind of power circuit of temperature control liquid crystal screen controller.
Background technique
The products such as temperature controlled bed, temp-controlled mattress generally use a temperature controller and are controlled, and temperature controller has control chip and liquid crystal
Screen, the liquid crystal display are needed through a means of power, and the alternating current of 220V is converted to 24V direct current by power supply device.It is existing
Power supply device be adapter or Switching Power Supply, AC portion can't be mutually isolated with direct current component, and there are breakdown
May, therefore safety is lower.In addition existing power supply device firewire switch use direct physical switch, need closely into
Row manipulation, since physical switch is close to the alternating current of 220V, for the operators, safety is lower.
Summary of the invention
In view of this, a kind of the present invention provides direct currents by output and alternating current completely isolated, remote controlled friendship
The firewire of galvanic electricity, improve safety temperature control liquid crystal screen controller power circuit, to solve the above problems.
A kind of power circuit of temperature control liquid crystal screen controller, including the electronic switching circuit and electronic cutting being connect with firewire L
Rectifier bridge that powered-down road and zero curve N are all connected with, the filtered electrical being connected between the first output end and second output terminal of rectifier bridge
Hold C1, the start triggering circuit being connected between the first output end and second output terminal of rectifier bridge, with it is the first of rectifier bridge defeated
The half bridge converter that outlet, second output terminal and start triggering circuit are all connected with, and it is defeated with the first of half bridge converter
The magnetic core isolated buck transformer TR that outlet and second output terminal are all connected with, magnetic core isolated buck transformer TR have input around
Group, output winding and across input winding and export the magnetic core of winding, input the both ends of winding respectively with half bridge converter
First output end and second output terminal connection, export the first end of winding as the first output end of direct current, second end is as direct current
Second output terminal.
Further, the electronic switching circuit include controllable silicon SCR, resistance R1, resistance R2, resistance R3, control chip,
Photoelectrical coupler IOS and fuse FU；The input terminal of controllable silicon SCR is connect with firewire L, the first end of output end and fuse FU
Connection, control terminal are connect by resistance R1 with input terminal, and control terminal is also connect with the first output end of photoelectrical coupler IOS, light
The second output terminal of electric coupler IOS is connected by resistance R2 and the output end of controllable silicon SCR；The power supply of photoelectrical coupler IOS
End is connect by resistance R3 with a DC power supply VCC, and control terminal is connect with the signal output end of control chip, controls the electricity of chip
Source is connect with DC power supply VCC.
Further, the rectifier bridge includes first diode D1, the second diode D2, third diode D3 and the four or two
The anode of pole pipe D4, first diode D1 are connect with the second end of fuse FU, cathode as rectifier bridge the first output end simultaneously
It is connect with the cathode of the 4th diode D4；The cathode of second diode D2 is connect with the anode of first diode D1, anode conduct
The second output terminal of rectifier bridge is simultaneously connect with the anode of third diode D3；The cathode and the 4th diode D4 of third diode D3
Anode connection, and connect with zero curve N.
Further, the start triggering circuit include the 5th diode D5, the 6th diode D6, the 7th diode D7,
Capacitor C2, capacitor C3, resistance R4 and bidirectional trigger diode DB；The anode of 5th diode D5 and the second output terminal of rectifier bridge
Connection, cathode are connect with the anode of the 6th diode D6；The cathode of 6th diode D6 and the first output end of rectifier bridge connect；
The cathode of 7th diode D7 is connect with the 5th diode D5 cathode, and anode is connected by the second output terminal of capacitor C3 and rectifier bridge
It connects, and is connected by the first output end of resistance R4 and rectifier bridge；Capacitor C2 is connected to the both ends of resistance R4；Two-way two pole of triggering
The first end of pipe DB is connect with the anode of the 7th diode D7.
Further, the half bridge converter include the first field-effect tube VT1, the second field-effect tube VT2, capacitor C4,
Capacitor C5, capacitor C6, capacitor C7, resistance R5, resistance R6, resistance R7, the 8th diode D8, the 9th diode D9, the first winding
L1, the second winding L2 and tertiary winding L3；The drain electrode of first field-effect tube VT1 and the first output end of rectifier bridge connect, source electrode
It is connect with the drain electrode of the second field-effect tube VT2, grid is connect by resistance R5 with the first end of the first winding L1；The of capacitor C4
One end is connect with the drain electrode of the first field-effect tube VT1, and second end is connect with the source electrode of the first field-effect tube VT1；First winding L1
Second end connect with the source electrode of the first field-effect tube VT1, while being connect with the anode of the 8th diode D8, the 8th diode D8
Cathode connect with the grid of the first field-effect tube VT1；The grid of second field-effect tube VT2 passes through resistance R6 and two-way triggering two
The second end of pole pipe DB connects, and source electrode is connect with the second output terminal of rectifier bridge 20；The first end of capacitor C5 and the second field-effect
The drain electrode of pipe VT2 connects, and second end is connect with the source electrode of the second field-effect tube VT2；The first end and rectifier bridge of tertiary winding L3
Second output terminal connection, second end connect by resistance R7 with the grid of the second field-effect tube VT2；The sun of 9th diode D9
The connection of the second output terminal of pole and rectifier bridge, cathode are connect with the grid of the second field-effect tube VT2；The first end of second winding L2
Be all connected with the source electrode of the first field-effect tube VT1 and the cathode of the 7th diode D7, second end as half bridge converter
One output end；The first end of capacitor C6 is connect with the drain electrode of the first field-effect tube VT1, and the first end of second end and capacitor C7 connect
It connects；The second end of capacitor C7 and the second output terminal of rectifier bridge connect；Node between capacitor C6 and capacitor C7 is as semibridge system
The second output terminal of converter.
Further, the first winding L1, the second winding L2 and tertiary winding L3 are wound on same magnetic core, are formed
One self-excited driving transformer.
Compared with prior art, the power circuit of temperature control liquid crystal screen controller of the invention includes the electricity connecting with firewire L
Sub switch circuit, the rectifier bridge connecting with electronic switching circuit and zero curve N, the first output end for being connected to rectifier bridge and second are defeated
Filter capacitor C1 between outlet, the start triggering circuit being connected between the first output end and second output terminal of rectifier bridge,
The half bridge converter being all connected with the first output end, second output terminal and the start triggering circuit of rectifier bridge, and and half-bridge
The magnetic core isolated buck transformer TR that the first output end and second output terminal of formula converter are all connected with, magnetic core isolated buck transformation
Device TR has input winding, output winding and across input winding and exports the magnetic core of winding, input the both ends of winding respectively with
The first output end and second output terminal of half bridge converter connect, and export the first end of winding as the first output end of direct current,
Second end is as direct current second output terminal.So completely isolated, remote controlled alternating current by the direct current of output and alternating current
Firewire, improve safety.
Detailed description of the invention
The embodiment of the present invention is described below in conjunction with attached drawing, in which:
Fig. 1 is the circuit diagram of the power circuit of temperature control liquid crystal screen controller provided by the invention.
Specific embodiment
Specific embodiments of the present invention are further elaborated below based on attached drawing.It should be understood that herein
The explanation of the embodiment of the present invention is not intended to limit the scope of protection of the present invention.
Referring to FIG. 1, the power circuit of temperature control liquid crystal screen controller provided by the invention includes connecting with outside firewire L
Electronic switching circuit 10, is connected to the two of rectifier bridge 20 at the rectifier bridge 20 being all connected with electronic switching circuit 10 and outside zero curve N
Filter capacitor C1 between a output end, the start triggering circuit 30 being connected between two output ends of rectifier bridge 20, with it is whole
Flow bridge 20 two output ends and the half bridge converter 40 that is all connected with of start triggering circuit 30 and with half bridge converter 40
The magnetic core isolated buck transformer TR of two output ends connection.Since the frequency of liquid crystal display is higher, power is smaller, magnetic core isolation drop
Pressure transformer TR can export the power supply signal of high-frequency, low-power.
Electronic switching circuit 10, which is realized, controls the remote switch of firewire L, and rectifier bridge 20 is for realizing rectification, filter capacitor
C1 is for filtering, and start triggering circuit 30 is used to trigger half bridge converter 40, the field-effect tube in half bridge converter 40
Pressure resistance is lower, will not be more than the peak value of defeated people's voltage；The saturation voltage of field-effect tube also minimizes；Filter capacitor C1's is resistance to
Pressure also can reduce.The voltage magnitude being applied on magnetic core isolated buck transformer TR only has the half of former input voltage.
Electronic switching circuit 10 includes controllable silicon SCR, resistance R1, resistance R2, resistance R3, control chip U1, photoelectric coupling
Device IOS and fuse FU.
The input terminal of controllable silicon SCR is connect with firewire L, and output end is connect with the first end of fuse FU, and control terminal passes through
Resistance R1 is connect with input terminal, and control terminal is also connect with the first output end of photoelectrical coupler IOS, and the of photoelectrical coupler IOS
Two output ends are connected by resistance R2 and the output end of controllable silicon SCR.
The power end of photoelectrical coupler IOS is connect by resistance R3 with DC power supply VCC, and control terminal is with control chip U1's
The power end of signal output end connection, control chip U1 is connect with DC power supply VCC.
In present embodiment, control chip U1 is single-chip microcontroller TSSOP20A.
Rectifier bridge 20 includes first diode D1, the second diode D2, third diode D3 and the 4th diode D4.First
The anode of diode D1 is connect with the second end of fuse FU, cathode as rectifier bridge 20 the first output end and with the four or two pole
The cathode of pipe D4 connects；The cathode of second diode D2 is connect with the anode of first diode D1, and anode is as rectifier bridge 20
Second output terminal is simultaneously connect with the anode of third diode D3；The cathode of third diode D3 and the anode of the 4th diode D4 connect
It connects, while being connect with zero curve N.
The first end of filter capacitor C1 is connect with the first output end of rectifier bridge 20, and the second of second end and rectifier bridge 20 is defeated
Outlet connection.
Start triggering circuit 30 includes the 5th diode D5, the 6th diode D6, the 7th diode D7, capacitor C2, capacitor
C3, resistance R4 and bidirectional trigger diode DB.
The anode of 5th diode D5 is connect with the second output terminal of rectifier bridge 20, the anode of cathode and the 6th diode D6
Connection, the cathode of the 6th diode D6 are connect with the first output end of rectifier bridge 20.
The cathode of 7th diode D7 is connect with the 5th diode D5 cathode, anode pass through capacitor C3 and rectifier bridge 20 the
The connection of two output ends, and connect by resistance R4 with the first output end of rectifier bridge 20, capacitor C2 is connected to the both ends of resistance R4.
The first end of bidirectional trigger diode DB is connect with the anode of the 7th diode D7.
Half bridge converter 40 includes the first field-effect tube VT1, the second field-effect tube VT2, capacitor C4, capacitor C5, capacitor
C6, capacitor C7, resistance R5, resistance R6, resistance R7, the 8th diode D8, the 9th diode D9, the first winding L1, the second winding
L2 and tertiary winding L3.
The drain electrode of first field-effect tube VT1 is connect with the first output end of rectifier bridge 20, source electrode and the second field-effect tube VT2
Drain electrode connection, grid connect by resistance R5 with the first end of the first winding L1.The first end of capacitor C4 and the first field-effect
The drain electrode of pipe VT1 connects, and second end is connect with the source electrode of the first field-effect tube VT1.The second end of first winding L1 with first
The source electrode of effect pipe VT1 connects, while connecting with the anode of the 8th diode D8, the cathode of the 8th diode D8 and first effect
Should pipe VT1 grid connection.
The grid of second field-effect tube VT2 is connect by resistance R6 with the second end of bidirectional trigger diode DB, source electrode and
The second output terminal of rectifier bridge 20 connects.The first end of capacitor C5 is connect with the drain electrode of the second field-effect tube VT2, second end and the
The source electrode of two field-effect tube VT2 connects.The first end of tertiary winding L3 is connect with the second output terminal of rectifier bridge 20, and second end is logical
It crosses resistance R7 to connect with the grid of the second field-effect tube VT2, the anode of the 9th diode D9 and the second output terminal of rectifier bridge 20
Connection, cathode are connect with the grid of the second field-effect tube VT2.
The first end of second winding L2 is all connected with the source electrode of the first field-effect tube VT1 and the cathode of the 7th diode D7,
First output end of the second end as half bridge converter 40.
The first end of capacitor C6 is connect with the drain electrode of the first field-effect tube VT1, and second end is connect with the first end of capacitor C7,
The second end of capacitor C7 is connect with the second output terminal of rectifier bridge 20.Node between capacitor C6 and capacitor C7 becomes as semibridge system
The second output terminal of parallel operation 40.
Magnetic core isolated buck transformer TR has input winding, output winding and across input winding and the magnetic of output winding
Core, the both ends for inputting winding are connect with the first output end and second output terminal of half bridge converter 40 respectively, export winding
Direct current first output end OUT1 of the first end as the power circuit of temperature control liquid crystal screen controller provided by the invention, second end are made
For the direct current second output terminal OUT2 of the power circuit of temperature control liquid crystal screen controller provided by the invention.
First winding L1, the second winding L2 and tertiary winding L3 are wound on same iron core or magnetic core, collectively constitute one
Self-excited driving transformer.Self-excited driving transformer has enough exciting currents to flow through, it is ensured that the first field-effect tube VT1,
Two field-effect tube VT2 being capable of normally switch motion.
The positive half-wave of alternating current passes through the delay of resistance R4, capacitor C3, the second field-effect tube VT2 conducting.Electric current is by capacitor
Node between C6, capacitor C7 passes through input winding, the second winding L2, the second field-effect tube of magnetic core isolated buck transformer TR
VT2 forming circuit.Positive voltage under being born in induction on the second winding L2 at this time, the just lower voltage born in the first winding L1 induction,
Positive voltage under being born in tertiary winding L3 induction.This is to the conducting of the first field-effect tube VT1 and the shutdown of the second field-effect tube VT2
It creates conditions.After the first field-effect tube VT1 conducting, electric current is by the first field-effect tube VT1 by the second winding L2, input winding
Flow to the node between capacitor C6, capacitor C7.First field-effect tube VT1, the second field-effect tube VT2 switching frequency be this hair
The working frequency of the power circuit of the temperature control liquid crystal screen controller of bright offer.
Similarly, the working principle of the negative half-wave of alternating current is similar.
Compared with prior art, the power circuit of temperature control liquid crystal screen controller of the invention includes the electricity connecting with firewire L
Sub switch circuit 10, the rectifier bridge 20 being connect with electronic switching circuit 10 and zero curve N, the first output end for being connected to rectifier bridge 20
And filter capacitor C1 between second output terminal, the starting that is connected between the first output end and second output terminal of rectifier bridge 20
The semibridge system that the first output end, second output terminal and the start triggering circuit 30 of trigger circuit 30 and rectifier bridge 20 are all connected with becomes
Parallel operation 40 and the magnetic core isolated buck transformer TR being all connected with the first output end and second output terminal of half bridge converter 40,
Magnetic core isolated buck transformer TR has input winding, output winding and across input winding and the magnetic core of output winding, input
The both ends of winding are connect with the first output end and second output terminal of half bridge converter 40 respectively, and the first end for exporting winding is made
For the first output end of direct current, second end is as direct current second output terminal.So by the direct current of output and alternating current it is completely isolated,
The firewire of remote controlled alternating current improves safety.
The foregoing is merely a prefered embodiment of the invention, is not used to limitation protection scope of the present invention, any in the present invention
Modification, equivalent replacement or improvement in spirit etc., all cover in scope of the presently claimed invention.
Claims (6)
1. a kind of power circuit of temperature control liquid crystal screen controller, it is characterised in that: the electronic cutting including connecting with firewire L is powered-down
Road, the rectifier bridge being all connected with electronic switching circuit and zero curve N, the first output end for being connected to rectifier bridge and second output terminal it
Between filter capacitor C1, be connected between the first output end and second output terminal of rectifier bridge start triggering circuit, with rectification
The half bridge converter that the first output end, second output terminal and the start triggering circuit of bridge are all connected with, and and half-bridge converter
Magnetic core isolated buck transformer TR, magnetic core isolated buck transformer the TR tool that the first output end and second output terminal of device are all connected with
Have input winding, output winding and across input winding and export the magnetic core of winding, input the both ends of winding respectively with semibridge system
The first output end and second output terminal of converter connect, and export the first end of winding as the first output end of direct current, second end
As direct current second output terminal.
2. the power circuit of temperature control liquid crystal screen controller as described in claim 1, it is characterised in that: the electronic switching circuit
Including controllable silicon SCR, resistance R1, resistance R2, resistance R3, control chip, photoelectrical coupler IOS and fuse FU；Controllable silicon SCR
Input terminal connect with firewire L, output end is connect with the first end of fuse FU, and control terminal is connected by resistance R1 and input terminal
It connects, control terminal is also connect with the first output end of photoelectrical coupler IOS, and the second output terminal of photoelectrical coupler IOS passes through resistance
R2 and the output end of controllable silicon SCR connect；The power end of photoelectrical coupler IOS is connect by resistance R3 with a DC power supply VCC,
Control terminal is connect with the signal output end of control chip, and the power end for controlling chip is connect with DC power supply VCC.
3. the power circuit of temperature control liquid crystal screen controller as described in claim 1, it is characterised in that: the rectifier bridge includes the
The anode and fuse of one diode D1, the second diode D2, third diode D3 and the 4th diode D4, first diode D1
The second end of FU connects, cathode as rectifier bridge the first output end and connect with the cathode of the 4th diode D4；Two or two pole
The cathode of pipe D2 is connect with the anode of first diode D1, anode as rectifier bridge second output terminal and with third diode D3
Anode connection；The cathode of third diode D3 is connect with the anode of the 4th diode D4, and is connect with zero curve N.
4. the power circuit of temperature control liquid crystal screen controller as described in claim 1, it is characterised in that: the start triggering circuit
Including the 5th diode D5, the 6th diode D6, the 7th diode D7, capacitor C2, two pole capacitor C3, resistance R4 and two-way triggering
Pipe DB；The anode of 5th diode D5 and the second output terminal of rectifier bridge connect, and cathode is connect with the anode of the 6th diode D6；
The cathode of 6th diode D6 and the first output end of rectifier bridge connect；The cathode of 7th diode D7 and the 5th diode D5 yin
Pole connection, anode are connected by the second output terminal of capacitor C3 and rectifier bridge, and pass through the first output of resistance R4 and rectifier bridge
End connection；Capacitor C2 is connected to the both ends of resistance R4；The anode of the first end of bidirectional trigger diode DB and the 7th diode D7
Connection.
5. the power circuit of temperature control liquid crystal screen controller as claimed in claim 4, it is characterised in that: the half bridge converter
Including the first field-effect tube VT1, the second field-effect tube VT2, capacitor C4, capacitor C5, capacitor C6, capacitor C7, resistance R5, resistance
R6, resistance R7, the 8th diode D8, the 9th diode D9, the first winding L1, the second winding L2 and tertiary winding L3；First
The drain electrode of effect pipe VT1 and the first output end of rectifier bridge connect, and source electrode is connect with the drain electrode of the second field-effect tube VT2, grid
It is connect by resistance R5 with the first end of the first winding L1；The first end of capacitor C4 is connect with the drain electrode of the first field-effect tube VT1,
Second end is connect with the source electrode of the first field-effect tube VT1；The source electrode of the second end of first winding L1 and the first field-effect tube VT1 connect
It connects, while being connect with the anode of the 8th diode D8, the grid of the cathode of the 8th diode D8 and the first field-effect tube VT1 connect
It connects；The grid of second field-effect tube VT2 is connect by resistance R6 with the second end of bidirectional trigger diode DB, source electrode and rectifier bridge
20 second output terminal connection；The first end of capacitor C5 is connect with the drain electrode of the second field-effect tube VT2, second end and second effect
Should pipe VT2 source electrode connection；The first end of tertiary winding L3 and the second output terminal of rectifier bridge connect, and second end passes through resistance R7
It is connect with the grid of the second field-effect tube VT2；The second output terminal of the anode of 9th diode D9 and rectifier bridge connects, cathode with
The grid of second field-effect tube VT2 connects；The source electrode and the seven or two pole of the first end of second winding L2 and the first field-effect tube VT1
The cathode of pipe D7 is all connected with, first output end of the second end as half bridge converter；The first end of capacitor C6 and first effect
Should pipe VT1 drain electrode connection, second end connect with the first end of capacitor C7；The second end of capacitor C7 and the second output of rectifier bridge
End connection；Second output terminal of the node as half bridge converter between capacitor C6 and capacitor C7.
6. the power circuit of temperature control liquid crystal screen controller as claimed in claim 5, it is characterised in that: the first winding L1,
Second winding L2 and tertiary winding L3 are wound on same magnetic core, form a self-excited driving transformer.
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| CN201910593673.5A CN110266198A (en) | 2019-07-03 | 2019-07-03 | The power circuit of temperature control liquid crystal screen controller |
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| CN103108457A (en) * | 2013-01-18 | 2013-05-15 | 上海君能能源科技有限公司 | High-frequency driver of light-emitting diode (LED) lamp |
| CN204482072U (en) * | 2014-12-11 | 2015-07-15 | 陆贺 | A kind of single live wire switching circuit |
| CN209930151U (en) * | 2019-07-03 | 2020-01-10 | 嘉兴福气多温控床有限公司 | Power supply circuit of temperature control liquid crystal screen controller |
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- 2019-07-03 CN CN201910593673.5A patent/CN110266198A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202269705U (en) * | 2011-05-26 | 2012-06-13 | 戴清传 | Electrothermal warm cushion and electrothermal seating furniture |
| CN103108457A (en) * | 2013-01-18 | 2013-05-15 | 上海君能能源科技有限公司 | High-frequency driver of light-emitting diode (LED) lamp |
| CN204482072U (en) * | 2014-12-11 | 2015-07-15 | 陆贺 | A kind of single live wire switching circuit |
| CN209930151U (en) * | 2019-07-03 | 2020-01-10 | 嘉兴福气多温控床有限公司 | Power supply circuit of temperature control liquid crystal screen controller |
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