CN113115499B - Isolation control current self-adaptive boost circuit - Google Patents
Isolation control current self-adaptive boost circuit Download PDFInfo
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- CN113115499B CN113115499B CN202110376592.7A CN202110376592A CN113115499B CN 113115499 B CN113115499 B CN 113115499B CN 202110376592 A CN202110376592 A CN 202110376592A CN 113115499 B CN113115499 B CN 113115499B
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- 238000002955 isolation Methods 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000009286 beneficial effect 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
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- 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
- H05B45/345—Current stabilisation; Maintaining constant current
-
- 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
-
- 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]
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an isolation control current self-adaptive boost circuit which comprises a switch power supply module, a voltage sampling circuit module, a backlight source module, a voltage follower module, a constant current unit module, a current setting module and an auxiliary power supply module, wherein the output of the switch power supply module is connected with the voltage sampling circuit module and the backlight source module, the negative electrode of the backlight source module is connected with the input end of the voltage follower module and the input end of the constant current unit module, the voltage sampling circuit module is connected with the output end of the voltage follower module, the output of the current setting module is connected with the constant current unit module, and the output of the auxiliary power supply module is connected with the constant current unit module. The isolation control current self-adaptive boost circuit isolates the backlight source circuit by utilizing the photoelectric coupler and the voltage follower, so that the accuracy of the current of the backlight source module is higher, and meanwhile, the auxiliary power module is also added with 1V voltage, and the auxiliary power module is used as auxiliary input voltage when the current of the backlight source module is small, so that the accuracy of the current of the backlight source can be better optimized.
Description
Technical Field
The invention relates to the field of power supply circuits of display screen backlight source testing equipment, in particular to an isolated control current self-adaptive boost circuit.
Background
Most of backlight sources in the existing market are realized by LEDs, high-precision current is often required for supplying power to the backlight sources, and in an existing constant current circuit, a constant current triode is directly connected with an operational amplifier, so that base current of the triode flows into a sampling resistor to influence the precision of the sampled current. In addition, the self-adaptive detection circuit is directly connected with the backlight circuit, and a part of current on the backlight is absorbed by the circuit, so that the current precision is also influenced. Thus, the current accuracy of the backlight is not high.
Disclosure of Invention
The invention aims to provide an isolated control current self-adaptive boost circuit which is used for solving the problem of low current precision of a backlight source in the prior art.
The invention provides an isolation control current self-adaptive boost circuit which comprises a switch power supply module, a voltage sampling circuit module, a backlight source module, a voltage follower module, a constant current unit module, a current setting module and an auxiliary power supply module, wherein the output of the switch power supply module is connected with the voltage sampling circuit module and the backlight source module, the negative electrode of the backlight source module is connected with the input end of the voltage follower module and the input end of the constant current unit module, the voltage sampling circuit module is connected with the output end of the voltage follower module, the output of the current setting module is connected with the constant current unit module, and the output of the auxiliary power supply module is connected with the constant current unit module.
Further, the voltage sampling circuit module comprises resistors R1, R2 and R2-1, and a diode D1, wherein D1 is a voltage stabilizing diode and is used for keeping the output no-load voltage of the switching power supply at 74V, R1 is connected with the output end of the switching power supply, R1, D1 and R2 are connected in series, R2 is grounded, and R2-1 is connected with the output end of the voltage follower module.
Further, the backlight unit is formed by serially connecting a plurality of light emitting diodes, and the highest forward voltage after the serial connection of the diodes is not more than 74V.
Further, the voltage follower module comprises an operational amplifier U1A, a diode D2, a resistor R3 and a resistor R4, wherein the in-phase end of the operational amplifier U1A is connected with the resistor R3, the R3 is connected with the negative electrode of the backlight unit and used for detecting the negative terminal voltage of the backlight unit, the reverse end of the operational amplifier U1A is connected with one end of the resistor R4, the other end of the R4 is connected with the output end of the operational amplifier U1A and used for following, the output of the operational amplifier U1A is connected with the diode D2, and the D2 is connected with the R2-1.
Further, the constant current unit module includes an operational amplifier U2A, an optocoupler U3, a darlington triode Q1, a diode D3, capacitors C1 and C2, resistors R5, R6, R7 and R8, the in-phase input end of the operational amplifier U2A is connected with a current setting module, the current setting module provides voltage according to the required current, the inverting end of the operational amplifier U2A is connected with the capacitors C1 and C2, the resistor R7 and an auxiliary power module, the output of the operational amplifier U2A is connected with the capacitor C2 and the resistor R6, the capacitor C1 is used for filtering, the capacitor C2, the resistors R6 and R7 and the current setting module jointly form an operational amplifier subtraction operation, the positive electrode of the optocoupler U3 is connected with the resistor R6, the negative electrode is grounded, the C electrode is connected with the base electrode of the triode Q1, the C electrode of the triode Q1 is connected with the negative electrode of the diode D3, the E electrode is connected with the resistors R7 and R8, and the negative electrode of the triode Q3 is grounded, and the positive electrode and the negative electrode of the backlight source are connected with the negative electrode of the diode D5.
Further, the auxiliary power supply module comprises a 1V power supply and a resistor R9, wherein the power supply is connected with R9, and R9 is connected with C1 and R7 and the inverting input end of the operational amplifier U2A.
The technical scheme of the invention has the beneficial effects that:
the isolation control current self-adaptive boost circuit isolates the backlight source circuit by utilizing the photoelectric coupler and the voltage follower, so that the accuracy of the current of the backlight source module is higher, and meanwhile, the auxiliary power module is also added with 1V voltage, and the auxiliary power module is used as auxiliary input voltage when the current of the backlight source module is small, so that the accuracy of the current of the backlight source can be better optimized.
Drawings
FIG. 1 is a schematic diagram of an isolated control current adaptive boost circuit according to the present invention;
in the drawings, the list of components represented by the various numbers is as follows:
the device comprises a 1-switching power supply module, a 2-voltage sampling circuit module, a 3-backlight module, a 4-voltage follower module, a 5-constant current unit module, a 6-current setting module and a 7-auxiliary power supply module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
As shown in fig. 1, the invention provides an isolated control current self-adaptive boost circuit, which comprises a switching power supply module 1, a voltage sampling circuit module 2, a backlight module 3, a voltage follower module 4, a constant current unit module 5, a current setting module 6 and an auxiliary power supply module 7, wherein the output of the switching power supply module 1 is connected with the voltage sampling circuit module 2 and the backlight module 3, the negative electrode of the backlight module 3 is connected with the input end of the voltage follower module 4 and the input end of the constant current unit module 5, the voltage sampling circuit module 2 is connected with the output end of the voltage follower module 4, the output of the current setting module 6 is connected with the constant current unit module 5, the output of the auxiliary power supply module 7 is connected with the constant current unit module 5, the switching power supply module 1 is a power supply module capable of adjusting the output voltage, and the output voltage of the switching power supply is automatically adjusted according to feedback voltage signals provided by the voltage sampling circuit module 2 and the voltage follower module 4.
Specifically, the voltage sampling circuit module 2 includes resistors R1, R2-1, and a diode D1, where D1 is a zener diode, and is configured to keep an output no-load voltage of the switching power supply at 74V, where R1 is connected to an output end of the switching power supply, R1, D1, and R2 are connected in series, and R2 is grounded, and R2-1 is connected to an output end of the voltage follower module 4; r1, R2, R2-1 and D1 together form an acquisition output voltage and current, the R2-1 acquires load voltage, and the acquired voltage is fed back to the switching power supply; when the switching power supply module 1 is in idle load, the D1 voltage stabilizing tube is reversely conducted and then provides feedback voltage to control the switching power supply, when the switching power supply module 1 is in load and the load voltage is lower than 74V, the voltage stabilizing diode D1 is not conducted, and the R2-1 provides feedback voltage signals to the switching power supply module 1 to control the output voltage. The three elements R1, D1 and R2 are used for controlling no-load voltage, the resistance value of R1/R2 cannot be too small or too large, the resistance is too small to shunt, the efficiency is affected, the oscillation can be caused due to the too large resistance, D1 is a 51V voltage stabilizing tube, and the output voltage of the switching power supply module 1 exceeds 51V, and the D1 is a key device for realizing self-adaptive boosting.
Specifically, the backlight unit is formed by serially connecting a plurality of light emitting diodes, and the highest forward voltage after the serial connection of the diodes is not more than 74V.
Specifically, the voltage follower module 4 includes an operational amplifier U1A, a diode D2, and resistors R3 and R4, where the in-phase end of the operational amplifier U1A is connected to the resistor R3, the R3 is connected to the negative electrode of the backlight unit and is used to detect the negative voltage of the backlight unit, the reverse end of the operational amplifier U1A is connected to one end of the resistor R4, the other end of the R4 is connected to the output end of the operational amplifier U1A and is used for following, the output of the operational amplifier U1A is connected to the diode D2, and the D2 is connected to the R2-1, and the D2 is used for anti-reflection; and R3, R4, three elements of the operational amplifier U1A form a voltage follower together, and the voltage of the negative end of the backlight unit detected by R3 is fed back to the switching power supply module 1. Because the voltage follower input is used for detecting the negative electrode of the backlight module 3, the switching power supply module 1 can stabilize the output voltage only after the negative electrode voltage reaches the required voltage, and the positive electrode voltage of the backlight module 3 can be satisfied first to satisfy the negative electrode voltage, thereby achieving the self-adaptive boosting principle.
The voltage follower is mainly an operational amplifier, one characteristic of the operational amplifier is that the input impedance is super large, the input current can be considered as 0 current input, the 3 pin of the operational amplifier U1A is used as input, the other end of the operational amplifier U1A is connected with R3, the other end of the operational amplifier U3 is connected with the negative electrode of the backlight source, and the voltage of the backlight source is detected at all times, so that the self-adaptive boosting is realized. Because the input resistance of the operational amplifier U1A is very large, the current flowing from the backlight source to the operational amplifier can be regarded as 0, so that the voltage follower does not influence the current of the backlight source, the current acquired by the sampling resistor R8 is the real current of the backlight source, and the current precision is high.
The output of the voltage follower is connected with the diode D2, the cathode of the diode D2 is connected with the R2-1, the R2-1 is connected with the switching power supply module 1, the D2 plays a role in protecting the operational amplifier U1A, when reverse high voltage (surge voltage) exists, the U1A is protected from being damaged, the R2-1 and the R2 form a voltage sampling circuit, the sampled voltage controls the self-adaptive circuit of the switching power supply module 1, and the voltage output by the switching power supply module 1 is enabled to adapt to the voltage of the backlight load.
Specifically, the constant current unit module 5 includes an operational amplifier U2A, an optocoupler U3, a darlington triode Q1, a diode D3, capacitors C1 and C2, resistors R5, R6, R7, and R8, where the in-phase input end of the operational amplifier U2A is connected to a current setting module 6, the current setting module 6 provides a voltage according to the magnitude of a required current, after the voltage is determined, the inverting end of the backlight unit determines the current flowing through the backlight unit, the inverting end of the operational amplifier U2A is connected to the capacitors C1 and C2, the resistor R7 and the auxiliary power module 7, the output of the operational amplifier U2A is connected to the capacitor C2 and the resistor R6, the capacitor C1 is used for filtering, the capacitor C2 is used for feedback, the positive electrode of the operational amplifier U2A, the capacitor C2, the resistor R6, and the resistor R7 are connected to the anode of the optocoupler U3, the cathode of the resistor R5, the electrode of the diode Q1 is connected to the base of the triode Q1, the negative electrode of the diode D3 is connected to the cathode of the diode D3, and the negative electrode of the diode D3 is connected to the cathode of the resistor R8, and the negative electrode of the diode D8 is connected to the cathode of the resistor R3; r5 provides bias voltage, R7 is used for detecting the voltage on the R8 resistor, R8 is a sampling current resistor, and U3, Q3 and R8 form constant current control.
The constant current control adopts an operational amplifier U2A to control an optical coupler U3, the input of the optical coupler U3 is connected with the output of the operational amplifier U2A, the optical coupler is a photoelectric coupling device, and the input and the output are isolated. Therefore, the control current of the input end does not flow into the output end, the current of the output end comes from the current in the backlight module 3, and finally flows out from the backlight module 3, and the current collected by the current sampling resistor R8 is the actual current of the backlight all the time, so the precision is high.
In addition, the diode D3 is used to boost the base voltage of the transistor Q1, to boost the control accuracy, and to reverse protect.
Specifically, the auxiliary power module 7 includes a 1V power supply, a resistor R9, where the power supply is connected to R9 and R9, and the power supply is connected to C1 and R7, and the inverting input end of the op-amp U2A, where R9 and C1 together provide a bias power supply, increase a bias voltage of 1V, and when the power of the backlight is very small, the collected voltage is very small, and if there is no bias voltage, the op-amp operation will be unstable.
In summary, the isolation control current self-adaptive boost circuit isolates the backlight source circuit by utilizing the photoelectric coupler and the voltage follower, so that the accuracy of the current of the backlight source module 3 is higher, and meanwhile, the auxiliary power module 7 is also added with 1V voltage, and the auxiliary power module is used as an auxiliary input voltage when the current of the backlight source module 3 is very small, so that the accuracy of the backlight source current can be better optimized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The isolation control current self-adaptive boost circuit is characterized by comprising a switch power supply module, a voltage sampling circuit module, a backlight source module, a voltage follower module, a constant current unit module, a current setting module and an auxiliary power supply module, wherein the output of the switch power supply module is connected with the voltage sampling circuit module and the backlight source module, the negative electrode of the backlight source module is connected with the input end of the voltage follower module and the input end of the constant current unit module, the voltage sampling circuit module is connected with the output end of the voltage follower module, the output of the current setting module is connected with the constant current unit module, the output of the auxiliary power supply module is connected with the constant current unit module,
the constant current unit module comprises an operational amplifier U2A, an optocoupler U3, a Darlington triode Q1, a diode D3, capacitors C1 and C2, resistors R5, R6, R7 and R8, wherein the non-inverting input end of the operational amplifier U2A is connected with a current setting module, the current setting module provides voltage according to the required current, the inverting end of the operational amplifier U2A is connected with the capacitors C1 and C2, the resistor R7 and an auxiliary power module, the output of the operational amplifier U2A is connected with the capacitors C2 and R6, the capacitor C1 is used for filtering, the capacitor C2 is used for feedback, the operational amplifier U2A, the capacitors C2, the resistors R6 and R7 and the current setting module jointly form operational amplifier subtraction operation, the positive electrode of the input end of the optocoupler U3 is connected with the resistor R6, the negative electrode is grounded, the C electrode of the C electrode is connected with the base electrode of the triode Q1, the C electrode of the C electrode is connected with the negative electrode of the diode D3, the E electrode of the E electrode is connected with the resistors R7 and R8, and the R8 are grounded, and the positive electrode of the D3 and the negative electrode of the backlight module are connected with the negative electrode module.
2. The isolation control current adaptive boost circuit of claim 1, wherein the voltage sampling circuit module comprises resistors R1, R2-1, and a diode D1, wherein the D1 is a zener diode for maintaining the output no-load voltage of the switching power supply at 74V, the R1 is connected to the output terminal of the switching power supply, the R1, D1, and R2 are connected in series, the R2 is grounded, and the R2-1 is connected to the output terminal of the voltage follower module.
3. The isolated control current adaptive boost circuit of claim 1, wherein the backlight module is comprised of a plurality of leds connected in series, wherein the highest forward voltage after the series connection of the leds is no more than 74V.
4. The isolation control current self-adaptive boost circuit according to claim 2, wherein the voltage follower module comprises an operational amplifier U1A, a diode D2, resistors R3 and R4, wherein the in-phase end of the operational amplifier U1A is connected with the resistor R3, the R3 is connected with the negative electrode of the backlight module and is used for detecting the negative voltage of the backlight module, the reverse end of the operational amplifier U1A is connected with one end of the resistor R4, the other end of the R4 is connected with the output end of the operational amplifier U1A and is used for following, the output of the operational amplifier U1A is connected with the diode D2, and the D2 is connected with the R2-1.
5. The isolated control current adaptive boost circuit of claim 4, wherein the auxiliary power module comprises a 1V power supply, resistor R9, power connection R9, R9 connected to the inverting input of C1, R7, op-amp U2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110376592.7A CN113115499B (en) | 2021-04-07 | 2021-04-07 | Isolation control current self-adaptive boost circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110376592.7A CN113115499B (en) | 2021-04-07 | 2021-04-07 | Isolation control current self-adaptive boost circuit |
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| Publication Number | Publication Date |
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| CN113115499A CN113115499A (en) | 2021-07-13 |
| CN113115499B true CN113115499B (en) | 2024-01-09 |
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|---|---|---|---|---|
| JP2004280763A (en) * | 2003-03-13 | 2004-10-07 | Masanobu Matsuda | Power source circuit, and electronic apparatus mounting the same |
| CN101754541A (en) * | 2010-01-27 | 2010-06-23 | 英飞特电子（杭州）有限公司 | DC bus voltage following control circuit suitable for multi-path parallel LEDs |
| CN103703867A (en) * | 2011-07-11 | 2014-04-02 | ams有限公司 | Voltage supply arrangement and method for supplying voltage to an electrical load with transistor saturation regulation |
| CN104754841A (en) * | 2015-04-20 | 2015-07-01 | 乐雷光电技术（上海）有限公司 | Current ripple elimination control circuit |
| CN205335970U (en) * | 2016-01-08 | 2016-06-22 | 中铁建设集团有限公司 | Roofing photovoltaic power generation system for building public lighting |
| CN110529645A (en) * | 2019-09-06 | 2019-12-03 | 天津明硕机电设备股份有限公司 | A kind of ratio valve-driving circuit of band overheat overcurrent protection function |
-
2021
- 2021-04-07 CN CN202110376592.7A patent/CN113115499B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004280763A (en) * | 2003-03-13 | 2004-10-07 | Masanobu Matsuda | Power source circuit, and electronic apparatus mounting the same |
| CN101754541A (en) * | 2010-01-27 | 2010-06-23 | 英飞特电子（杭州）有限公司 | DC bus voltage following control circuit suitable for multi-path parallel LEDs |
| CN103703867A (en) * | 2011-07-11 | 2014-04-02 | ams有限公司 | Voltage supply arrangement and method for supplying voltage to an electrical load with transistor saturation regulation |
| CN104754841A (en) * | 2015-04-20 | 2015-07-01 | 乐雷光电技术（上海）有限公司 | Current ripple elimination control circuit |
| CN205335970U (en) * | 2016-01-08 | 2016-06-22 | 中铁建设集团有限公司 | Roofing photovoltaic power generation system for building public lighting |
| CN110529645A (en) * | 2019-09-06 | 2019-12-03 | 天津明硕机电设备股份有限公司 | A kind of ratio valve-driving circuit of band overheat overcurrent protection function |
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| CN113115499A (en) | 2021-07-13 |
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