CN212393028U - Power supply system of centralized power supply and distributed current source - Google Patents
Power supply system of centralized power supply and distributed current source Download PDFInfo
- Publication number
- CN212393028U CN212393028U CN202020079000.6U CN202020079000U CN212393028U CN 212393028 U CN212393028 U CN 212393028U CN 202020079000 U CN202020079000 U CN 202020079000U CN 212393028 U CN212393028 U CN 212393028U
- Authority
- CN
- China
- Prior art keywords
- resistor
- power supply
- capacitor
- diode
- current source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model is suitable for an electronic circuit technical improvement field provides a centralized power supply and distributed current source's power supply system, centralized power supply and distributed current source's power supply system includes electrical unit, voltage regulating signal processing unit and multiunit current source unit, the multiunit is connected respectively to electrical unit's output the electrical unit, the multiunit the output of electrical unit is connected respectively voltage regulating signal processing unit's input, voltage regulating signal processing unit's output is connected electrical unit's input. The power supply unit adopts a switch power supply technology, the current source adopts a linear technology, the matching cost and reliability are optimal, the reliability of the linear current source is higher than that of the switch current source, and the EMI interference is smaller. Thus, this combination achieves a dual optimization of control and cost.
Description
Technical Field
The utility model belongs to the technical improvement field of electronic circuit, especially, relate to a power supply system of centralized power source and distributed current source.
Background
In the LED lighting or light heating scheme, a current source is required to drive and supply power to the LEDs, and in some schemes, a large number of small LED units are required to form an assembly, and the LED units are driven in series as shown in fig. 1.
In some schemes, more LEDs need to be driven, multiple strings of LEDs are driven, and a schematic diagram of driving is as shown in fig. 2, such driving employs distributed power supply, which requires more independent current sources, and more current sources bring cost increase, and in order to simplify the scheme and reduce cost, centralized power supply is often employed, as shown in fig. 3, and centralized power supply of such distributed current sources greatly reduces power supply cost and is beneficial to centralized maintenance of a power supply part, so in many low-cost power supplies, the following scheme in fig. 4 is often employed: although the driving scheme of directly adopting a power supply as a centralized power supply and adopting a resistor for current limiting is simple in solution and easy to configure a general power supply, the introduction of the current limiting resistor can cause the reduction of power supply efficiency.
Meanwhile, no matter a centralized power supply scheme of a current source or a power source is adopted, if an LED light source is directly formed by connecting a plurality of LEDs in series and then in parallel to form an LED array, under the condition of centralized power supply, the LED strings are not uniform, so that some LED strings with large shunt current are burnt out, and after some LED strings are burnt out, the rest current is poured into the rest LED strings, so that the rest LED strings are further burnt out. That is, localized LED damage can lead to an avalanche condition where all other LEDs are damaged.
The existing technology is high in cost, unreliable or poor in precision.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power supply system of centralized power source and distributed current source aims at solving among the prior art with high costs, unreliable and the not good technical problem of precision.
The utility model discloses a realize like this, a centralized power supply and distributed current source's power supply system, centralized power supply and distributed current source's power supply system includes electrical unit, pressure regulating signal processing unit and multiunit current source unit, the multiunit is connected respectively to electrical unit's output the electrical unit, the multiunit the output of electrical unit is connected respectively the input of pressure regulating signal processing unit, the output of pressure regulating signal processing unit is connected electrical unit's input.
The utility model discloses a further technical scheme is: the current source unit comprises a current control circuit and a voltage differential amplification circuit, the current control circuit and the voltage differential amplification circuit are arranged in parallel, and the output end of the voltage differential amplification circuit is connected with the input end of the voltage regulating signal processing unit.
The utility model discloses a further technical scheme is: the current control circuit comprises a chip U2, a resistor R1 and a resistor R12 resistor R13, wherein a Vout pin of the chip U2 is connected with one end of the resistor R1, an ADJ pin of the chip U2 connects the resistor R12 with one end of the resistor R13, a Vin pin of the chip U2 is connected with the power supply unit, and the other end of the resistor R13 is grounded.
The utility model discloses a further technical scheme is: the current control circuit comprises a triode Q1, a resistor Rn6 and a resistor Rn5, wherein a collector of the triode Q1 is connected with one end of the resistor Rn5, an emitter of the triode Q1 is connected with the power supply unit, one end of the resistor Rn is connected with the power supply unit, the other end of the resistor Rn is connected with one end of the resistor Rn6, and a grid of the triode Q1 is respectively connected with the other end of the resistor Rn5 and the other end of the resistor Rn 6.
The utility model discloses a further technical scheme is: the voltage differential amplifying circuit comprises a differential amplifier U1, a resistor R14, a resistor R11 and a diode D1, wherein an input end of the differential amplifier U1 is connected with one end of the resistor R14 and one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the power supply unit, a + input end of the differential amplifier is connected with one end of the resistor R12 and one end of the resistor R13 or the ground respectively, and an anode of the diode D1 is connected with one end of the resistor R14 and an output end of the differential amplifier respectively.
The utility model discloses a further technical scheme is: the voltage-regulating signal processing unit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R15, a diode D15, an optical coupler U15, an operational amplifier A15 and an operational amplifier A15, wherein one end of the resistor R15 is connected with one end of the resistor R15 and one end of the capacitor C15, one end of the capacitor C15 and one end of the resistor R15, the other end of the resistor R15 is connected with one end of the resistor R15 and one end of the capacitor C15, the other end of the capacitor C15 and the other end of the resistor R15 are connected with one end of the resistor R15, the other end of the resistor R15 and one end of the resistor R15 are connected with one end of the, One end of a capacitor C5 and an input of an operational amplifier A3, the other end of the resistor R4 connects the diode D2 to Vadj, the other end of the resistor R5 connects the + input of the operational amplifier A3 and the one end of a resistor R8, the other end of the resistor R2 connects the one end of the resistor R15, the one end of an operational amplifier, the one end of a resistor R6, the one end of a capacitor C8, the input end of an operational amplifier A4 and Vcc, the output end of the operational amplifier A3 connects the other end of the capacitor C5 and the cathode of a diode D3, the + input of the operational amplifier A4 connects the other end of the resistor R9, the other end of a resistor R6 and the cathode of a diode D6, the-input of the operational amplifier A4 connects the one end of the resistor R10, the one end of a capacitor C4, the one end of a resistor R9, the one end of a capacitor C7 and the cathode of a diode D4, the positive pole of diode D4 is connected Vadj, the negative pole of diode D5 is connected respectively the output of operational amplifier A4, the other end of resistance R10 and the other end of electric capacity C4, the 1 st foot of opto-coupler U3 is connected respectively the positive pole of diode D3 and the positive pole of diode D5, the 2 nd foot of opto-coupler U3 is connected the other end of resistance R15, the 3 rd foot of opto-coupler U3 is connected the + input of operational amplifier A5, the 4 th foot of opto-coupler U3 is through resistance R16 connects Vpp.
The utility model has the advantages that: the power supply unit adopts a switch power supply technology, the current source adopts a linear technology, the matching cost and reliability are optimal, the reliability of the linear current source is higher than that of the switch current source, and the EMI interference is smaller. Thus, this combination achieves a dual optimization of control and cost. According to the power supply structure, the EMI interference source is basically concentrated on the side of the switching power supply, is far away from the load and is easy to concentrate, and the linear current source close to the load cannot generate EMI interference and can absorb the EMI interference output by the port of the switching power supply, so that the interference of sharp noise on the bearing of the load end is effectively reduced. By reasonably controlling the voltage drop at two ends of the linear current source to be less than 5% of the power supply voltage of the switching power supply, the efficiency of the linear current source under the structure can reach more than 95%, and is superior to the efficiency of the switching power supply in the same scene. Therefore, the power supply architecture can obtain better EMC performance and higher power supply efficiency.
Drawings
Fig. 1 is a schematic diagram of a conventional LED series and driving of the LED series by a current source.
Fig. 2 is a schematic diagram of a conventional LED series-parallel connection and driving of an LED assembly using distributed current sources.
Fig. 3 is a schematic diagram of LED series-parallel connection and driving of an LED assembly by centralized power supply of a current source in the prior art.
Fig. 4 is a schematic diagram of driving an LED assembly by LED series-parallel connection and centralized power supply.
Fig. 5 is the power supply centralized shunt constant current of the present invention drives the LED module.
Fig. 6 is the utility model discloses a centralized shunt constant current of power drives the principle block diagram to the LED subassembly.
Fig. 7 is a flow chart of the voltage regulation of the power supply unit by the voltage regulation signal processing ADJ unit of the present invention.
Fig. 8 is a schematic diagram illustrating detection of the voltage regulation signal processing ADJ unit according to the present invention.
Fig. 9 is a schematic diagram of the constant current limiting circuit of the present invention.
Fig. 10 is a schematic diagram of the core control circuit of the power supply unit regulated by the voltage regulation signal processing ADJ unit of the present invention.
Detailed Description
As shown in fig. 5-10, the utility model provides a power supply system of centralized power supply and distributed current source, power supply system of centralized power supply and distributed current source includes electrical unit, pressure regulating signal processing unit and multiunit current source unit, the multiunit is connected respectively to electrical unit's output electrical unit, the multiunit current source unit's output is connected respectively the input of pressure regulating signal processing unit, the output of pressure regulating signal processing unit is connected electrical unit's input. The power supply unit is a centralized power supply unit, and a core control management circuit of the power supply unit can automatically regulate voltage after receiving the voltage regulating signal of the voltage regulating signal processing unit; the current control circuit is a general linear constant current control power supply; the voltage differential amplifying circuit is used for detecting the voltage of the input/output port of the current control circuit unit to obtain differential voltage and sending the differential voltage to the voltage regulating signal processing unit; the voltage regulating signal processing unit is used for processing the uploaded differential voltage; the power supply unit is used for supplying power to the current control circuit, the voltage differential amplification circuit and the voltage regulation signal processing unit, and the current control circuit unit and the voltage differential amplification voltage are connected in parallel and then connected with the voltage regulation signal processing unit.
The voltage regulating signal processing unit selects a minimum value and a maximum value for the uploaded differential voltage, and when the maximum value is larger than a set threshold value, the output voltage of the power supply is reduced; when the minimum value is smaller than a set threshold value, the output voltage of the power supply is increased; and when the maximum value and the minimum value exceed the protection threshold value, giving a shutdown protection command.
And the power supply unit performs voltage regulation or shutdown protection according to the Vadj signal provided by the voltage regulation signal processing unit.
The voltage regulating signal processing unit comprises an analog signal and a digital signal.
The current control circuit unit supplies power for distributed current.
The current source unit comprises a current control current and voltage differential amplification circuit, the current control current and the voltage differential amplification circuit are arranged in parallel, and the output end of the voltage differential amplification circuit is connected with the input end of the voltage regulating signal processing unit.
The current control circuit comprises a chip U2, a resistor R1 and a resistor R12 resistor R13, wherein a Vout pin of the chip U2 is connected with one end of the resistor R1, an ADJ pin of the chip U2 connects the resistor R12 with one end of the resistor R13, a Vin pin of the chip U2 is connected with the power supply unit, and the other end of the resistor R13 is grounded.
The current control circuit comprises a triode Q1, a resistor Rn6 and a resistor Rn5, wherein a collector of the triode Q1 is connected with one end of the resistor Rn5, an emitter of the triode Q1 is connected with the power supply unit, one end of the resistor Rn is connected with the power supply unit, the other end of the resistor Rn is connected with one end of the resistor Rn6, and a grid of the triode Q1 is respectively connected with the other end of the resistor Rn5 and the other end of the resistor Rn 6.
The voltage differential amplifying circuit comprises a differential amplifier U1, a resistor R14, a resistor R11 and a diode D1, wherein an input end of the differential amplifier U1 is connected with one end of the resistor R14 and one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the power supply unit, a + input end of the differential amplifier is connected with one end of the resistor R12 and one end of the resistor R13 or the ground respectively, and an anode of the diode D1 is connected with one end of the resistor R14 and an output end of the differential amplifier respectively.
The voltage-regulating signal processing unit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R15, a diode D15, an optical coupler U15, an operational amplifier A15 and an operational amplifier A15, wherein one end of the resistor R15 is connected with one end of the resistor R15 and one end of the capacitor C15, one end of the capacitor C15 and one end of the resistor R15, the other end of the resistor R15 is connected with one end of the resistor R15 and one end of the capacitor C15, the other end of the capacitor C15 and the other end of the resistor R15 are connected with one end of the resistor R15, the other end of the resistor R15 and one end of the resistor R15 are connected with one end of the, One end of a capacitor C5 and an input of an operational amplifier A3, the other end of the resistor R4 connects the diode D2 to Vadj, the other end of the resistor R5 connects the + input of the operational amplifier A3 and the one end of a resistor R8, the other end of the resistor R2 connects the one end of the resistor R15, the one end of an operational amplifier, the one end of a resistor R6, the one end of a capacitor C8, the input end of an operational amplifier A4 and Vcc, the output end of the operational amplifier A3 connects the other end of the capacitor C5 and the cathode of a diode D3, the + input of the operational amplifier A4 connects the other end of the resistor R9, the other end of a resistor R6 and the cathode of a diode D6, the-input of the operational amplifier A4 connects the one end of the resistor R10, the one end of a capacitor C4, the one end of a resistor R9, the one end of a capacitor C7 and the cathode of a diode D4, the positive pole of diode D4 is connected Vadj, the negative pole of diode D5 is connected respectively the output of operational amplifier A4, the other end of resistance R10 and the other end of electric capacity C4, the 1 st foot of opto-coupler U3 is connected respectively the positive pole of diode D3 and the positive pole of diode D5, the 2 nd foot of opto-coupler U3 is connected the other end of resistance R15, the 3 rd foot of opto-coupler U3 is connected the + input of operational amplifier A5, the 4 th foot of opto-coupler U3 is through resistance R16 connects Vpp.
The utility model provides a centralized power supply, distributed current source power supply structure, its principle schematic diagram is shown in FIG. 5, and its principle block diagram is shown in FIG. 6, include:
the power supply unit is a centralized power supply and can automatically regulate voltage after receiving the voltage regulating signal of the voltage regulating signal processing unit; the centralized power source VDC is used as the total power supply of the system, the distributed current sources control the current of a single path, the voltage drop of the terminal voltage of the current source is fed back to the power source, and the power source regulates the output voltage to reduce the port voltage drop of the current source so as to achieve the optimal efficiency. The schematic block diagram of this scheme is as follows:
the current control circuit is a general linear constant current control power supply;
the voltage difference amplifying circuit is used for detecting the voltage of the input/output port of the current control circuit to obtain a difference voltage delta V and sending the difference voltage delta V to the voltage regulating signal processing unit ADJ;
as shown in fig. 7, the voltage-regulating signal processing unit ADJ processes the uploaded differential voltage by Δ V1 and Δ V2 … … Δ Vn; selecting the Minimum value delta Vmin (delta V1 and delta V2 … … delta Vn) and the Maximum value delta Vmax (delta V1 and delta V2 … … delta Vn) of the differential voltage, and reducing the output voltage of the power supply when the delta Vmax is greater than a set threshold value; when Δ Vmin is less than a set threshold, the output voltage of the "power supply" is adjusted up. When the delta Vmax and the delta Vmax exceed the protection threshold, a shutdown protection command is given.
The power supply unit is used for supplying power to the current control circuit, the voltage differential amplification circuit and the voltage regulation signal processing unit, and the current control circuit and the voltage differential amplification circuit are connected in parallel and then connected with the voltage regulation signal processing unit.
And the power supply unit performs voltage regulation or shutdown protection according to the Vadj signal given by the voltage regulation signal processing unit ADJ. The voltage-regulating signal Vadj may be an analog signal or a digital signal, and when the "power supply" supports analog voltage regulation, the "voltage-regulating signal processing ADJ" outputs an analog signal, and when the "power supply" supports digital voltage regulation, the "power supply" outputs a digital signal.
The actual implementation circuit is shown in fig. 8, in the nth path, a current limiting circuit is formed by a three-terminal regulator Un2 and a detection resistor Rn, a differential amplifier is formed by an operational amplifier Un1 and peripheral resistors thereof, a differential voltage Δ Un is detected, a maximum value is detected by Dn, so that Vadj is obtained, and then the voltage of a power module is regulated by a Vadj signal.
Wherein the current limiting circuit can also be implemented by the transistor or MOSFET transistor of fig. 9 or other general current limiting circuits.
As shown in fig. 10, the voltage-regulating signal Vadj detected by the voltage-regulating signal processing unit ADJ is superimposed on the feedback control circuit of the power supply unit, and is amplified and compensated by the error of the operational amplifier, and then acts on the feedback control of the switching power supply, thereby adjusting the output voltage of the switching power supply to match the power supply requirement of the subsequent-stage constant current source.
The current control circuit supplies power to the distributed current.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A power supply system of a centralized power supply and a distributed current source is characterized in that: the power supply system of the centralized power supply and the distributed current source comprises a power supply unit, a voltage regulating signal processing unit and a plurality of groups of current source units, wherein the output ends of the power supply unit are respectively connected with the plurality of groups of current source units, the output ends of the plurality of groups of current source units are respectively connected with the input end of the voltage regulating signal processing unit, and the output end of the voltage regulating signal processing unit is connected with the input end of the power supply unit.
2. The system according to claim 1, wherein the current source unit comprises a current control circuit and a voltage differential amplifier circuit, the current control circuit is connected in parallel with the voltage differential amplifier circuit, and an output terminal of the voltage differential amplifier circuit is connected to an input terminal of the voltage regulating signal processing unit.
3. The system as claimed in claim 2, wherein the current control circuit comprises a chip U2, a resistor R1, and a resistor R12-class resistor R13, a pin Vout of the chip U2 is connected to one end of the resistor R1, a pin ADJ of the chip U2 connects the resistor R12 to one end of the resistor R13, a pin Vin of the chip U2 is connected to the power unit, and the other end of the resistor R13 is grounded.
4. The system as claimed in claim 2, wherein the current control circuit includes a transistor Q1, a resistor Rn6, and a resistor Rn5, a collector of the transistor Q1 is connected to one end of the resistor Rn5, an emitter of the transistor Q1 is connected to the power unit, one end of the resistor Rn is connected to the power unit, the other end of the resistor Rn is connected to one end of the resistor Rn6, and a gate of the transistor Q1 is connected to the other end of the resistor Rn5 and the other end of the resistor Rn6, respectively.
5. The system according to claim 3 or 4, wherein the voltage differential amplifier circuit comprises a differential amplifier U1, a resistor R14, a resistor R11 and a diode D1, wherein a negative input terminal of the differential amplifier U1 is connected to one end of the resistor R14 and one end of the resistor R11 respectively, the other end of the resistor R11 is connected to the power unit, a positive input terminal of the differential amplifier is connected to one end of the resistor R12 and one end of the resistor R13 respectively or grounded, and an anode of the diode D1 is connected to one end of the resistor R14 and an output terminal of the differential amplifier respectively.
6. The power supply system of a concentrated power source and a distributed current source according to claim 5, wherein the voltage-regulating signal processing unit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R15, a resistor R16, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, an optocoupler U3, an operational amplifier A3 and an operational amplifier A3, one end of the resistor R3 is respectively connected to one end of the resistor R3, one end of the capacitor C3 and one end of the capacitor C3, the other end of the resistor R3 is respectively connected to one end of the resistor R3 and one end of the capacitor C3, the other end of the capacitor C3 and the capacitor C36, Vin is connected to one end of a resistor R7 and one end of a resistor R2, Vin is connected to the other end of the resistor R3, Vadj is connected to the other end of the resistor R3, the other end of the resistor R5 is connected to the + input of the operational amplifier A3 and one end of the resistor R8, the other end of the resistor R2 is connected to one end of the resistor R15, one end of the operational amplifier R6, one end of the capacitor C8, the input of the operational amplifier A4 and Vcc, the output of the operational amplifier A3 is connected to the other end of the capacitor C5 and the cathode of the diode D3, the + input of the operational amplifier A4 is connected to the other end of the resistor R8, the other end of the resistor R6 and the cathode of the diode D6, and the-inputs of the operational amplifier A4 are connected to one end of the resistor R10 and the cathode of the operational amplifier A3, respectively, One end of a capacitor C4, one end of a resistor R9, one end of a capacitor C7 and the cathode of a diode D4, the anode of the diode D4 is connected with Vadj, the cathode of the diode D5 is respectively connected with the output end of the operational amplifier A4, the other end of the resistor R10 and the other end of the capacitor C4, the 1 st pin of the optical coupler U3 is respectively connected with the anode of the diode D3 and the anode of the diode D5, the 2 nd pin of the optical coupler U3 is connected with the other end of the resistor R15, the 3 rd pin of the optical coupler U3 is connected with the + input of the operational amplifier A5, and the 4 th pin of the optical coupler U3 is connected with Vpp through the resistor R16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020079000.6U CN212393028U (en) | 2020-01-15 | 2020-01-15 | Power supply system of centralized power supply and distributed current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020079000.6U CN212393028U (en) | 2020-01-15 | 2020-01-15 | Power supply system of centralized power supply and distributed current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212393028U true CN212393028U (en) | 2021-01-22 |
Family
ID=74247862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020079000.6U Active CN212393028U (en) | 2020-01-15 | 2020-01-15 | Power supply system of centralized power supply and distributed current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212393028U (en) |
-
2020
- 2020-01-15 CN CN202020079000.6U patent/CN212393028U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101707831B (en) | LED driving circuit and LED lamp | |
| US20130088169A1 (en) | Constant-current led driver circuit and output voltage adjustable circuit and method thereof | |
| CN101790265A (en) | Multichannel constant current control circuit | |
| CN101977469B (en) | Adjustable LED drive power supply | |
| CN104253959A (en) | Low-power-consumption voltage-stabilizing backlight control circuit and television | |
| CN102014544A (en) | LED (Light-Emitting Diode) lamp driving circuit | |
| CN102014537B (en) | Drive circuit of LED lamp | |
| CN212393028U (en) | Power supply system of centralized power supply and distributed current source | |
| CN202111796U (en) | Constant current drive circuit and television set | |
| CN104253956A (en) | Low-power-consumption voltage-stabilizing backlight control circuit and television | |
| CN217240990U (en) | LED drive circuit and LED lighting device | |
| CN202035185U (en) | Light-emitting diode (LED) current feedback control circuit and television | |
| CN209151003U (en) | A kind of switching power supply system | |
| CN105487588A (en) | Constant current source circuit capable of being regulated and controlled in real time and constant current control method thereof | |
| CN217135737U (en) | Standby power consumption and power supply control circuit, lighting drive circuit and lamp | |
| CN106787627B (en) | The feedback control circuit of converter | |
| CN204886182U (en) | Parallelly connected power module can independently flow equalize | |
| CN212305721U (en) | Drive device | |
| CN112601324B (en) | LED drive power supply circuit capable of outputting wide voltage range | |
| CN113873715A (en) | Innovative flash lamp driving chip framework | |
| CN212324418U (en) | Parallel output LED driving power circuit and LED lamp | |
| CN206164935U (en) | LED driving circuit | |
| CN109195267B (en) | Novel direct current intelligent LED light source and control system | |
| CN221177540U (en) | Wide-range ideal diode driving circuit | |
| CN219351524U (en) | MOS drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |