CN206196094U - Improve overshoot current circuit - Google Patents
Improve overshoot current circuit Download PDFInfo
- Publication number
- CN206196094U CN206196094U CN201621285085.3U CN201621285085U CN206196094U CN 206196094 U CN206196094 U CN 206196094U CN 201621285085 U CN201621285085 U CN 201621285085U CN 206196094 U CN206196094 U CN 206196094U
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- China
- Prior art keywords
- feedback compensation
- compensation network
- amplifier
- network
- electric capacity
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The utility model relates to a current protection circuit technique of overshooting, the utility model provides an among the present LED flat screen television constant current control strategy problem of overshoot current probably appears in the twinkling of an eye in the start, provide an improve overshoot current circuit. Its technical scheme does: improve overshoot current circuit, including low pass filter network, sampling resistor and LED lamp strip, its characterized in that still swashs switch circuit, fortune and puts feedback compensation network no. 1 and fortune and put feedback compensation network no. 2 including turning over, it connects low pass filter network, fortune respectively and puts feedback compensation network no. 1 and fortune and put two, LED on feedback compensation network lamp strip and connect low pass filter network, sampling resistor and fortune respectively and put feedback compensation network no. 2 turn over to swash switch circuit. Voltage through on the control sampling resistor makes it progressively increase to improve the stream that overcharges. The beneficial effects of the utility model are that, can effectively improve the temporal overshoot current of LED TV start to implement simple, economy, be applicable to LED flat screen television.
Description
Technical field
The utility model is related to LED flat plate television backlight drive circuit technology, more particularly to improves overcharging current technique.
Background technology
In LED flat plate TV applications, part LED backlight drive circuit uses the circuit framework being illustrated in fig. 1 shown below, wherein
U1 is that PWM controls IC, by controlling the dutycycle of NMOS Q1, after the energy of flyback transformer T1 is transferred into secondary, by two
The D1 rectifying and wave-filterings of pole pipe one provide LED+ supply voltages, current sample are carried out by sampling resistor R2 resistance, by constant current unit
It is compared, feeds back, realizes current constant control.But traditional current constant control scheme is used, Fig. 3 institutes are likely to occur in booting moment
The overshoot current for showing, can influence the life-span of lamp bar when serious.
Utility model content
Improve overshoot current circuit the utility model proposes one kind, solve current constant control scheme in LED flat plate TV
The problem of overshoot current is likely to occur in booting moment.
The utility model solves its technical problem, and the technical scheme of use is：Improve overshoot current circuit, including low pass filtered
Wave network, sampling resistor and LED light bar, it is characterised in that also including flyback on-off circuit, amplifier feedback compensation network one and fortune
Feedback compensation network two is put, the flyback on-off circuit connects low-pass filter network, amplifier feedback compensation network one and fortune respectively
Feedback compensation network two is put, LED light bar connects low-pass filter network, sampling resistor and amplifier feedback compensation network two respectively.
The flyback on-off circuit includes operational amplifier, voltage source and ground wire, the positive pole concatenation operation of the voltage source
The electrode input end of amplifier, negative pole connection ground wire.
The amplifier feedback compensation network one includes resistance three and electric capacity two, and one end concatenation operation of the resistance three is amplified
The negative input of device, the other end connects one end of electric capacity two, the output end of the other end concatenation operation amplifier of electric capacity two.
The low-pass filter network includes resistance five, electric capacity four and ground wire, and one end concatenation operation of the resistance five is amplified
The negative input of device, the other end connects the negative pole of LED light bar, the negative pole input of one end concatenation operation amplifier of electric capacity four
End, other end connection ground wire.
The amplifier feedback compensation network two includes resistance four and electric capacity three, one end connection LED light bar of the resistance four
Positive pole, the other end connect electric capacity three one end, the negative input of the other end concatenation operation amplifier of electric capacity three.
The beneficial effects of the utility model are, by above-mentioned improvement overshoot current circuit, can be effectively improved LED television and open
The overshoot current of machine moment, and implement simple, economic, it is to avoid overshoot current can influence the life-span of lamp bar when serious.
Brief description of the drawings
Fig. 1 is the circuit diagram of current LED flat plate television backlight drive circuit.
Fig. 2 is the circuit diagram that the utility model improves overshoot current circuit.
Fig. 3 is using booting moment LED light bar current waveform under Fig. 1 circuit arrangements.
Fig. 4 is using booting moment LED light bar current waveform after the utility model circuit.
Wherein, OP1 is operational amplifier, and VCC is the voltage for accessing operational amplifier, and V2 is voltage source two, and R2 is resistance
Two, it is LED light bar current sampling resistor, and R3 is resistance three, and C2 is electric capacity two, and R5 is resistance five, and C4 is electric capacity four, and R4 is electricity
Four, C3 of resistance is electric capacity three, and LED light bar is made up of multiple light emitting diodes, and LED+ is the positive pole of lamp bar, and LED- is negative for lamp bar
Pole.U1 is that PWM controls IC, T1 are flyback transformer, and Q1 is NMOS tube, and R1 is resistance one, and V1 is voltage source one, and D1 is diode
One, C1 are electric capacity one.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment, the technical solution of the utility model is described in detail.
Improvement overshoot current circuit described in the utility model includes low-pass filter network, sampling resistor, LED light bar, flyback
On-off circuit, amplifier feedback compensation network one and amplifier feedback compensation network two, wherein, flyback on-off circuit connects low pass respectively
Filter network, amplifier feedback compensation network one and amplifier feedback compensation network two, LED light bar connect respectively low-pass filter network,
Sampling resistor and amplifier feedback compensation network two, its circuit diagram are as shown in Figure 2.Here, by controlling the voltage on sampling resistor,
It is stepped up it, so as to improve overshoot current.
Embodiment
The utility model embodiment LED flat plate TV improve overcharge current circuit by low-pass filter network, sampling resistor,
LED light bar, flyback on-off circuit, amplifier feedback compensation network one and amplifier feedback compensation network two are constituted, wherein, flyback switch
Circuit connects low-pass filter network, amplifier feedback compensation network one and amplifier feedback compensation network two respectively, and LED light bar connects respectively
Connect low-pass filter network, sampling resistor and amplifier feedback compensation network two.
In foregoing circuit, flyback on-off circuit includes the operational amplifier OP1 and V2 of voltage source two, wherein, the V2 of voltage source two
Positive pole concatenation operation amplifier OP1 electrode input end, negative pole connection ground wire；Amplifier feedback compensation network one includes resistance three
The R3 and C2 of electric capacity two, wherein, the negative input of one end concatenation operation amplifier OP1 of the R3 of resistance three, other end connection electric capacity
One end of two C2, the output end of the other end concatenation operation amplifier OP1 of the C2 of electric capacity two；Low-pass filter network includes the R5 of resistance five
With the C4 of electric capacity four, wherein, the negative input of one end concatenation operation amplifier of the R5 of resistance five, other end connection LED light bar
Negative pole, the negative input of one end concatenation operation amplifier OP1 of the C4 of electric capacity four, other end connection ground wire；Amplifier feedback compensation
Network two includes the R4 of the resistance four and C3 of electric capacity three, wherein, one end of the R4 of resistance four connects the positive pole of LED light bar, other end connection
One end of the C3 of electric capacity three, the negative input of the other end concatenation operation amplifier OP1 of the C3 of electric capacity three.
Specifically, when user starts shooting, U1 is that PWM controls IC, by controlling the dutycycle of NMOS Q1, by flyback transformation
After the energy of device T1 is transferred to secondary, LED+ supply voltages are provided by the D1 rectifying and wave-filterings of diode one, entered by the R2 of resistance two
Row current sample.OP1 is operational amplifier, and V2 is the voltage of voltage source two, and is the reference voltage of current sample, in LED light bar
The electric current for flowing through is equal to the voltage of reference voltage V 2 divided by the R2 resistances of resistance two, the LPF of the R5 of the resistance five and C4 of electric capacity four compositions
Network is used to filter the circuit noise of sampling resistor R2, the amplifier feedback compensation network two of the R4 of the resistance four and C3 of electric capacity three compositions
Suppress the electric current of the R2 of booting moment sampling resistor two, to realize soft start function, improve the overshoot that booting moment flows through LED light bar
Electric current.
Claims (5)
1. overshoot current circuit, including low-pass filter network, sampling resistor and LED light bar are improved, it is characterised in that also including anti-
Energizing switch circuit, amplifier feedback compensation network one and amplifier feedback compensation network two, the flyback on-off circuit connect low respectively
Pass filter network, amplifier feedback compensation network one and amplifier feedback compensation network two, LED light bar connect LPF net respectively
Network, sampling resistor and amplifier feedback compensation network two.
2. it is according to claim 1 to improve overshoot current circuit, it is characterised in that the flyback on-off circuit includes computing
Amplifier, voltage source and ground wire, the electrode input end of the positive pole concatenation operation amplifier of the voltage source, negative pole connection ground wire.
3. it is according to claim 2 to improve overshoot current circuit, it is characterised in that the amplifier feedback compensation network one is wrapped
Include resistance three and electric capacity two, the negative input of one end concatenation operation amplifier of the resistance three, other end connection electric capacity two
One end, the output end of the other end concatenation operation amplifier of electric capacity two.
4. it is according to claim 1 to improve overshoot current circuit, it is characterised in that the low-pass filter network includes resistance
5th, electric capacity four and ground wire, the negative input of one end concatenation operation amplifier of the resistance five, other end connection LED light bar
Negative pole, the negative input of one end concatenation operation amplifier of electric capacity four, the other end connection ground wire.
5. it is according to claim 2 to improve overshoot current circuit, it is characterised in that the amplifier feedback compensation network two is wrapped
Resistance four and electric capacity three are included, one end of the resistance four connects the positive pole of LED light bar, and the other end connects one end of electric capacity three, electricity
Hold the negative input of three other end concatenation operation amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621285085.3U CN206196094U (en) | 2016-11-28 | 2016-11-28 | Improve overshoot current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621285085.3U CN206196094U (en) | 2016-11-28 | 2016-11-28 | Improve overshoot current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206196094U true CN206196094U (en) | 2017-05-24 |
Family
ID=58724264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621285085.3U Active CN206196094U (en) | 2016-11-28 | 2016-11-28 | Improve overshoot current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206196094U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019000924A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳创维－Rgb电子有限公司 | Led light bar network current foldback circuit, driving power supply and tv set |
-
2016
- 2016-11-28 CN CN201621285085.3U patent/CN206196094U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019000924A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳创维－Rgb电子有限公司 | Led light bar network current foldback circuit, driving power supply and tv set |
| US10997900B2 (en) | 2017-06-27 | 2021-05-04 | Shenzhen Chuangwei-Rgb Electronic Co., Ltd. | LED light bar network current foldback circuit, driving power supply and TV set |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |