CN105848334B - L ED constant current control power supply - Google Patents
L ED constant current control power supply Download PDFInfo
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- CN105848334B CN105848334B CN201610184586.0A CN201610184586A CN105848334B CN 105848334 B CN105848334 B CN 105848334B CN 201610184586 A CN201610184586 A CN 201610184586A CN 105848334 B CN105848334 B CN 105848334B
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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]
- H05B45/40—Details of LED load circuits
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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]
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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)
Abstract
an L ED constant current control power supply comprises an alternating current input end, a diode rectifier bridge, a PFC circuit and an L ED load, wherein the alternating current input end is connected with the input end of the diode rectifier bridge, the output end of the diode rectifier bridge is connected with the input end of the PFC circuit, and the output end of the PFC circuit is connected with the L ED load and a constant current source respectively.
Description
Technical Field
The invention relates to an LED constant current control power supply.
Background
an existing LED constant current control power supply, as shown in fig. 1 of the specification, includes an ac input terminal, a diode rectifier bridge, a PFC circuit 1 and an LED load 2, wherein the ac input terminal is connected to an input terminal of the diode rectifier bridge, an output terminal of the diode rectifier bridge is connected to an input terminal of the PFC circuit 1, and an output terminal of the PFC circuit 1 is connected to the LED load 2 and a constant current source 3, respectively, and due to the influence of an external network, the fluctuation of an input voltage at the ac input terminal inevitably affects an output voltage of the constant current source 3, and thus affects a working efficiency η of the LED load 2, wherein a working voltage of the LED load 2 is set to be ULSetting the working voltage of the constant current source 3 to be UIThe input voltage of the AC input end is Uhwith eta ═ Uh-UL)/Uh。
Chinese patent document No. CN 202503732U discloses, in 24/10/2012, a linear non-isolated LED driving power supply with a high power factor, which includes an ac power input line, a diode rectifier bridge DB1, a valley-fill PFC circuit, and a constant current control circuit composed of a chip U1 of LNK306 and a closed loop controlled by the chip U1, where the ac power input line is connected to an input end of the diode rectifier bridge DB1, an output of the diode rectifier bridge DB1 is connected to the valley-fill PFC circuit, an output of the valley-fill PFC circuit is connected to the constant current control circuit, an output line of the closed loop in the constant current control circuit is connected to an external LED load, and a feedback circuit is connected between the closed loop output line and the chip U1. The valley-fill PFC circuit is composed of three diodes D3, D1 and D2 which are connected in series in the same direction, an electrolytic capacitor C1 connected between the anode of the diode D1 and the cathode of the diode D2, and an electrolytic capacitor C2 connected between the anode of the diode D3 and the cathode of the diode D1.
Disclosure of Invention
The invention aims to provide an LED constant-current control power supply with reasonable structure and stable performance so as to overcome the defects in the prior art.
The LED constant-current control power supply is structurally characterized by further comprising a sampling feedback circuit, wherein the sampling feedback circuit is connected among the PFC circuit, the LED load and the constant current source.
Further, the sampling feedback circuit is a first sampling feedback circuit, and the first sampling feedback circuit comprises a fortieth resistor, a third diode and a nineteenth capacitor; the anode of the third diode is connected between the cathode of the LED load and the anode of the constant current source, the anode of the nineteenth capacitor is connected between one end of the forty-th resistor and the cathode of the third diode, and the cathode of the nineteenth capacitor is connected with the cathode of the constant current source.
Further, the PFC circuit comprises a chip with the model of NCP1608B, and the other end of the fortieth resistor is connected with the reverse input end of the chip; the cathode of the constant current source is connected with the common end of the chip.
Further, the LED constant-current control power supply also comprises a singlechip pulse width modulation circuit, and the singlechip pulse width modulation circuit is connected between the other end of the forty-th resistor and the reverse input end of the chip.
Further, the sampling feedback circuit is a second sampling feedback circuit, and the second sampling feedback circuit comprises a sixth resistor, a forty-first resistor, a sixth diode and a twentieth capacitor; one end of the sixth resistor is respectively connected with one end of the forty-first resistor, the anode of the twentieth capacitor and the anode of the sixth diode, the cathode of the sixth diode is connected between the cathode of the LED load and the anode of the constant current source, the other end of the sixth resistor is connected with the anode of the LED load, and the cathode of the twentieth capacitor is connected with the cathode of the constant current source.
Further, the PFC circuit comprises a chip with the model of NCP1608B, and the other end of the forty-first resistor is connected with the reverse input end of the chip; the cathode of the constant current source is connected with the common end of the chip.
The LED constant current source sampling circuit comprises an alternating current input end, a diode rectifier bridge, a sampling feedback circuit, an LED load, a constant current source, a sampling feedback circuit and a PFC circuit, wherein the alternating current input end is connected with the input end of the diode rectifier bridge, the output end of the diode rectifier bridge is connected with the input end of the PFC circuit, the output end of the PFC circuit is respectively connected with the LED load and the constant current source, the sampling feedback circuit is connected among the PFC circuit, the LED load and the constant current source, the voltage of the constant current source is sampled by the sampling feedback circuit and fed back to the PFC circuit, and the working voltage of.
The sampling feedback circuit in the invention can be a first sampling feedback circuit or a second sampling feedback circuit, and when the sampling feedback circuit is the first sampling feedback circuit, the first sampling feedback circuit comprises a fortieth resistor, a third diode and a nineteenth capacitor; the anode of the third diode is connected between the cathode of the LED load and the anode of the constant current source, the anode of the nineteenth capacitor is connected between one end of the forty-th resistor and the cathode of the third diode, and the cathode of the nineteenth capacitor is connected with the cathode of the constant current source; when the sampling feedback circuit is a second sampling feedback circuit, the sampling feedback circuit comprises a sixth resistor, a forty-first resistor, a sixth diode and a twentieth capacitor; one end of a sixth resistor is respectively connected with one end of a forty-first resistor, the anode of a twentieth capacitor and the anode of a sixth diode, the cathode of the sixth diode is connected between the cathode of the LED load and the anode of the constant current source, the other end of the sixth resistor is connected with the anode of the LED load, and the cathode of the twentieth capacitor is connected with the cathode of the constant current source; the first sampling feedback circuit and the second sampling feedback circuit can sample the voltage of the constant current source and feed the voltage back to the PFC circuit, the working voltage of the LED load is adjusted through the PFC circuit, the working voltage of the LED load is guaranteed to be stable, and finally the working stability of the LED load can be guaranteed, so that different scheme choices are provided for customers.
The PFC circuit of the present invention includes a chip model NCP1608B, and the NCP1608 is a voltage mode power correction controller designed to drive a high efficiency pre-converter to achieve internal input linearity regulation consistency. The power of the device can reach 350W when the device works in a Crm current mode; the voltage mode of the power factor correction circuit can enable the power factor correction circuit to achieve a complete power factor without a linear induction network; the output voltage can be regulated with high precision, and the precision of the output voltage is ensured to be between 2.5V < + > -1.6% in most environments. When the NCP1608B chip is turned on, the current consumption is reduced to minimum 35uA, so that Vcc can be charged quickly without loss; thus, the NCP1608 provides low voltage lock and provides sufficient Vcc hysteresis to reduce the size of the capacitance required for Vcc when turned on.
In conclusion, the invention has the characteristics of reasonable structure and stable performance.
Drawings
Fig. 1 is a schematic circuit connection diagram of a conventional LED constant current control power supply.
Fig. 2 is a circuit connection diagram of the first embodiment of the invention.
FIG. 3 is a circuit diagram illustrating a second embodiment of the present invention.
FIG. 4 is a circuit diagram illustrating a third embodiment of the present invention.
FIG. 5 is a graph of the LED load voltage characteristics of the present invention
In the figure: the LED constant current source circuit comprises a PFC circuit 1, an LED load 2, a constant current source 3, a first sampling feedback circuit 4 and a second sampling feedback circuit 5.
Detailed Description
The invention is further described with reference to the following figures and examples.
First embodiment
Referring to fig. 2 and 5, the LED constant current control power supply comprises an ac input terminal, a diode rectifier bridge, a PFC circuit, an LED load 2, a sampling feedback circuit, and a sampling feedback circuit, wherein the ac input terminal is connected to the input terminal of the diode rectifier bridge, the output terminal of the diode rectifier bridge is connected to the input terminal of the PFC circuit 1, the output terminal of the PFC circuit 1 is connected to the LED load 2 and a constant current source 3, and the sampling feedback circuit is connected between the PFC circuit 1, the LED load 2, and the constant current source 3.
In this embodiment, the sampling feedback circuit is a first sampling feedback circuit 4, and the first sampling feedback circuit 4 includes a forty-th resistor R40, a third diode D3, and a nineteenth capacitor C19; the anode of the third diode D3 is connected between the cathode of the LED load 2 and the anode of the constant current source 3, the anode of the nineteenth capacitor C19 is connected between one end of the forty-th resistor R40 and the cathode of the third diode D3, and the cathode of the nineteenth capacitor C19 is connected to the cathode of the constant current source 3.
The PFC circuit 1 comprises a chip with the model number of NCP1608B, and the other end of a fortieth resistor R40 is connected with an inverted input end FB of the chip; the cathode of the constant current source 3 is connected with the common end GND of the chip.
NCP1608B is an active power factor controller specifically designed for use in AC-DC conversion adapters, electronic ballasts and other medium power off-line converters (typically below 350W power). It uses critical operating mode CrM to ensure high power factor and a wide input voltage and output power. NCP1608B minimizes the peripheral loop by integrating safety features internally, making it an excellent choice for PFC design. It is typically an SOIC-8 package.
Second embodiment
Referring to fig. 3, in this embodiment, the LED constant current control power supply further includes a single chip microcomputer pulse width modulation circuit MCU, and the single chip microcomputer pulse width modulation circuit MCU is connected between the other end of the forty-th resistor R40 and the reverse input terminal FB of the chip. The MCU mainly comprises three parts of A/D conversion input, program calculation and PWM output.
The rest of the parts which are not described in the first embodiment are not described in detail.
Third embodiment
Referring to fig. 4, in the present embodiment, the sampling feedback circuit is a second sampling feedback circuit 5, and the second sampling feedback circuit 5 includes a sixth resistor R6, a forty-first resistor R41, a sixth diode D6, and a twentieth capacitor C20; one end of the sixth resistor R6 is connected to one end of a forty-first resistor R41, the anode of the twentieth capacitor C20, and the anode of the sixth diode D6, respectively, the cathode of the sixth diode D6 is connected between the cathode of the LED load 2 and the anode of the constant current source 3, the other end of the sixth resistor R6 is connected to the anode of the LED load 2, and the cathode of the twentieth capacitor C20 is connected to the cathode of the constant current source 3.
The PFC circuit 1 comprises a chip with the model number of NCP1608B, and the other end of a forty-first resistor R41 is connected with an inverted input end FB of the chip; the cathode of the constant current source 3 is connected with the common end GND of the chip.
The rest of the parts which are not described in the first embodiment are not described in detail.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. An LED constant-current control power supply comprises an alternating-current input end, a diode rectifier bridge, a PFC circuit and an LED load (2), wherein the alternating-current input end is connected with the input end of the diode rectifier bridge, the output end of the diode rectifier bridge is connected with the input end of the PFC circuit (1), and the output end of the PFC circuit (1) is respectively connected with the LED load (2) and a constant current source (3), and the LED constant-current control power supply is characterized by further comprising a sampling feedback circuit, wherein the sampling feedback circuit is connected among the PFC circuit (1), the LED load (2) and the constant current source (3);
the sampling feedback circuit is a first sampling feedback circuit (4), and the first sampling feedback circuit (4) comprises a fortieth resistor (R40), a third diode (D3) and a nineteenth capacitor (C19); the anode of the third diode (D3) is connected between the cathode of the LED load (2) and the anode of the constant current source (3), the anode of the nineteenth capacitor (C19) is connected between one end of the forty-th resistor (R40) and the cathode of the third diode (D3), and the cathode of the nineteenth capacitor (C19) is connected with the cathode of the constant current source (3);
or,
the sampling feedback circuit is a second sampling feedback circuit (5), and the second sampling feedback circuit (5) comprises a sixth resistor (R6), a forty-first resistor (R41), a sixth diode (D6) and a twentieth capacitor (C20); one end of a sixth resistor (R6) is respectively connected with one end of a forty-first resistor (R41), the anode of a twentieth capacitor (C20) and the anode of a sixth diode (D6), the cathode of the sixth diode (D6) is connected between the cathode of the LED load (2) and the anode of the constant current source (3), the other end of the sixth resistor (R6) is connected with the anode of the LED load (2), and the cathode of the twentieth capacitor (C20) is connected with the cathode of the constant current source (3).
2. The LED constant current control power supply as claimed in claim 1, wherein the PFC circuit (1) comprises a chip with the model number of NCP1608B, and the other end of the fortieth resistor (R40) is connected with the reverse input end (FB) of the chip; the cathode of the constant current source (3) is connected with the common end (GND) of the chip.
3. The LED constant-current control power supply as claimed in claim 2, further comprising a single-chip microcomputer pulse-width Modulation Circuit (MCU), wherein the single-chip microcomputer pulse-width Modulation Circuit (MCU) is connected between the other end of the forty-th resistor (R40) and the reverse input end (FB) of the chip.
4. The LED constant current control power supply as claimed in claim 1, wherein the PFC circuit (1) comprises a chip with the model number of NCP1608B, and the other end of the forty-first resistor (R41) is connected with the reverse input end (FB) of the chip; the cathode of the constant current source (3) is connected with the common end (GND) of the chip.
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CN201610184586.0A CN105848334B (en) | 2016-03-26 | 2016-03-26 | L ED constant current control power supply |
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CN201610184586.0A CN105848334B (en) | 2016-03-26 | 2016-03-26 | L ED constant current control power supply |
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CN105848334B true CN105848334B (en) | 2018-03-02 |
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CN110048610B (en) * | 2019-04-04 | 2020-11-06 | 深圳康佳电子科技有限公司 | Self-adaptive backlight power supply circuit applied to LLC resonance framework |
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CN101477385B (en) * | 2008-12-10 | 2012-06-27 | 广州南科集成电子有限公司 | Constant-current constant-voltage circuit |
FI125185B (en) * | 2014-01-15 | 2015-06-30 | Teknoware Oy | Procedure and converter for power supply to series connected LEDs |
CN103813596B (en) * | 2014-03-10 | 2016-02-24 | 杭州士兰微电子股份有限公司 | The method of LED drive circuit and reduction LED current ripple |
CN204517687U (en) * | 2014-12-01 | 2015-07-29 | 张光阳 | A kind of efficient non-isolated power supply |
CN104703358B (en) * | 2014-12-17 | 2017-02-01 | 广州南科集成电子有限公司 | Wide-voltage-range LED (light emitting diode) lamp switching and dimming driving circuit and LED lamp dimming control system |
CN104703357B (en) * | 2015-03-23 | 2016-03-30 | 深圳市稳先微电子有限公司 | A kind of former limit feedback LED drive circuit |
CN205622921U (en) * | 2016-03-26 | 2016-10-05 | 中山市德源照明电器有限公司 | Non-isolated LED power supply |
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