CN111385942B - LED lamp driving circuit capable of improving PF value - Google Patents
LED lamp driving circuit capable of improving PF value Download PDFInfo
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- CN111385942B CN111385942B CN201911100857.XA CN201911100857A CN111385942B CN 111385942 B CN111385942 B CN 111385942B CN 201911100857 A CN201911100857 A CN 201911100857A CN 111385942 B CN111385942 B CN 111385942B
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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
- H05B44/00—Circuit arrangements for operating electroluminescent light sources
Abstract
The invention discloses an LED lamp driving circuit for improving a PF value, which comprises a rectifying module, a first isolation module, a second isolation module, a driving module, an auxiliary power supply module and an intelligent module, wherein the rectifying module is connected with the first isolation module and the second isolation module, the first isolation module is connected with the driving module, the second isolation module is connected with the auxiliary power supply module, and the auxiliary power supply module is connected with the driving module through the intelligent module. According to the invention, the isolation module is arranged, and the original filter circuit is divided into 2 parts which are respectively placed in the driving module and the auxiliary power supply module, so that the rectification amplitude is small, the operation is simple and convenient, and the rectification cost is low; meanwhile, due to the existence of the isolation module, the change of the driving module and the auxiliary power supply module does not influence the change of the input circuit, so that the PF value of the whole circuit is improved.
Description
Technical Field
The invention relates to the technical field of driving circuits, in particular to an LED lamp driving circuit for improving a PF value.
Background
The PF value (power factor) refers to the ratio of the average power of the ac circuit to the apparent power. Under certain voltage and power, the higher the value, the better the benefit, and the more fully the power generation equipment can be utilized. The requirement for low-power electric appliances and bulbs in the existing lighting products is low or even not required, so that the PF requirement of most circuit designs is not considered enough. However, as the environmental protection and energy saving concepts are increasingly popularized, various markets impose the PF standards. However, if the PF value of the existing circuit needs to be improved, the circuit must be modified greatly, so that the overall cost is greatly increased.
For example, chinese patent document CN202652621U discloses "a PF correction circuit for an LED driving power supply", in which one end of a resistor R7 is grounded, and the other end is connected to the base of a transistor Q4 and the anode of a zener diode D14 through a resistor R8; the collector of the triode Q4 is connected with one end of the capacitor C9 and the resistor R9 and is connected with the base of the triode Q5; the other end of the triode Q4, the emitter of the triode Q5 and the capacitor C9 is grounded, the other end of the resistor R9 is connected with the collector of the triode Q5 and is connected with the resistor R19 through the resistor R10, one end of the capacitor C12 is connected with the pin 2 of the integrated circuit U4 in parallel, the other end of the resistor R19 and the capacitor C12 is connected with the pin 1 of the integrated circuit U2 in parallel and is connected with the anode of the voltage stabilizing diode D14 and one output end of the photocoupler OC through the resistor R20, and the cathode of the voltage stabilizing diode D14 is connected with the pin 8 of the integrated circuit U2 in parallel and is connected with the other output end of the photocoupler OC. Although the circuit in the above patent document can improve the PF value, the modification width of the whole circuit is large, which increases the cost.
Disclosure of Invention
The invention mainly solves the technical problems of low PF value and high rectification cost of the original LED lamp driving circuit; the LED lamp driving circuit for improving the PF value can greatly improve the PF value only by fine adjustment on the basis of the original LED lamp driving circuit.
The technical problem of the invention is mainly solved by the following technical scheme: the intelligent power supply device comprises a rectification module, a first isolation module, a second isolation module, a driving module, an auxiliary power supply module and an intelligent module, wherein the rectification module is respectively connected with the first isolation module and the second isolation module, the first isolation module is connected with the driving module, the second isolation module is connected with the auxiliary power supply module, and the auxiliary power supply module is connected with the driving module through the intelligent module.
The driving circuit of the invention is rectified by the rectifying module from the input end and then is not directly filtered, so that the current distortion in the circuit is not obvious, the rectified driving circuit is divided into two branches, and one branch is the driving module and is responsible for providing current for the work of the LED lamp; the other path is an auxiliary power supply module, stable voltage is provided for the intelligent module, and the intelligent module can accept external dimming and color mixing signals, so that dimming and color mixing of the LED lamp are controlled. The driving module and the auxiliary power supply module are respectively isolated from an input circuit consisting of the rectifying module and the input end through the first isolation module and the second isolation module, and the change of the driving module and the auxiliary power supply module does not influence the change of the input circuit, so that the PF value of the whole circuit is improved.
Preferably, the first isolation module comprises a diode D1, an anode of the diode D1 is connected to the rectifying module, and a cathode of the diode D1 is connected to the driving module.
The driving module is isolated from the input circuit through the first isolation module, and the change of the driving module does not influence the change of the input circuit, so that the PF of the whole circuit is improved; meanwhile, the first isolation module only comprises one diode D1, and the structure is simple and the cost is low.
Preferably, the second isolation module comprises a diode D3, an anode of the diode D3 is connected to the rectifying module, and a cathode of the diode D3 is connected to the auxiliary power supply module.
The auxiliary power supply module is isolated from the input circuit through the second isolation module, and the change of the auxiliary power supply module does not influence the change of the input circuit, so that the PF value of the whole circuit is improved; meanwhile, the second isolation module only comprises one diode D3, and the structure is simple and the cost is low.
Preferably, the driving module comprises a driving control circuit and a driving filter circuit, one end of the driving filter circuit is connected with the output end of the first isolation module and the anode of the LED lamp, the other end of the driving filter circuit is connected with the output end of the driving control circuit and the cathode of the LED lamp, and the input end of the driving control circuit is connected with the output end of the intelligent module.
The cathode of the drive filter circuit is not directly grounded but connected to the inside of the drive control circuit, so that the influence of the charge and discharge of the drive filter circuit on the input circuit is reduced, and the PF of the whole circuit is improved.
Preferably, the driving module and the first isolation module are connected through a chip U2 and a capacitor C7, and the model of the chip U2 is DIO 8241F.
As the PF value in the driving circuit increases, the ripple in the circuit also increases, and the increase of the ripple causes the decrease of the PF value, so the chip U2 and the capacitor C7 are connected between the driving module and the first isolation module to eliminate the ripple in the circuit.
Preferably, the auxiliary power supply module comprises an auxiliary power supply circuit and an auxiliary filter circuit, one end of the auxiliary filter circuit is connected with the output end of the second isolation module and the input end of the auxiliary power supply circuit, the other end of the auxiliary filter circuit is grounded, and the output end of the auxiliary power supply circuit is connected with the intelligent module.
The auxiliary power supply module has smaller overall power consumption, meanwhile, the filtering electrolysis of the auxiliary filter circuit is also smaller, although the negative electrode of the auxiliary filter circuit is directly grounded, due to the isolation effect of the isolation module, the influence of the charging and discharging of the auxiliary filter circuit on the input circuit and the driving module can be ignored, and therefore the PF value of the whole circuit is improved.
The invention has the beneficial effects that: 1) the driving module and the auxiliary power supply module are in isolated connection with the rectifying module through diodes, and the change of the driving module and the auxiliary power supply module does not influence the change of an input circuit, so that the PF value of the whole circuit is improved; 2) the cathode of a driving filter circuit in the driving module is not directly grounded but connected to the inside of the driving control circuit, so that the influence of the charging and discharging of the driving filter circuit on an input circuit is reduced, and the PF value of the whole circuit is improved; 3) the driving circuit is rectified by the rectifying module from the input end and then is not directly filtered, so that the current distortion in the circuit is not obvious; 4) the PF value of the whole circuit can be improved by slightly changing the original driving circuit, and the driving circuit is simple and convenient to operate and low in cost.
Drawings
Fig. 1 is a block diagram of a circuit schematic connection structure of the present invention.
Fig. 2 is a circuit schematic of the present invention.
In the figure, the intelligent power supply device comprises a rectifier module 1, a rectifier module 2, a first isolation module 3, a second isolation module 4, a driving module 5, an auxiliary power supply module 6 and an intelligent module.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the LED lamp driving circuit capable of improving the PF value of the embodiment, as shown in FIG. 1, the LED lamp driving circuit comprises a rectifying module 1, a first isolation module 2, a second isolation module 3, a driving module 4, an auxiliary power supply module 5 and an intelligent module 6, wherein the rectifying module is connected with the first isolation module, the rectifying module is connected with the second isolation module through a parallel inductor L1 and a resistor R5, the first isolation module is connected with the driving module through a chip U2 and a capacitor C7, the second isolation module is connected with the auxiliary power supply module, and the auxiliary power supply module is connected with the driving module through the intelligent module.
As shown in fig. 2, the rectifier module includes a fuse F1 and a rectifier bridge DB 1; the first isolation module includes a diode D1; the second isolation module includes a diode D3; the driving module comprises a chip U3, a resistor RS7, a resistor RS8, a resistor R8, a capacitor C5 and a capacitor C6, wherein a filter circuit is formed by the capacitor C5 and the capacitor C6, a driving control circuit is formed by the chip U3, the resistor RS7, the resistor RS8 and the resistor R8, and the chip U3 adopts a dimmable LED constant current driving chip with the model number of SM2123 EG; the auxiliary power supply module comprises a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D2, a resistor R2, a resistor R3, a resistor R4 and an inductor L2, wherein the chip U1, the capacitor C3, the capacitor C4, the diode D2, the resistor R2, the resistor R3, the resistor R4 and the inductor L2 form an auxiliary power supply circuit, the capacitor C2 is a filter capacitor, the chip U1 adopts a non-isolated step-down constant voltage driving chip, and the type of the chip U1 is BP 8516F; the intelligent module comprises a chip US3, and the model number of the chip US3 is TYLC 5; an inductor L1 and a resistor R5 are connected between the rectifying module and the second isolation module, a chip U2 and a capacitor C7 are connected between the first isolation module and the driving module, and the model of the chip U2 is DIO 8241.
A pin 3 of the rectifier bridge DB1 is connected to a live wire of the commercial power through a fuse F1, a pin 4 of the rectifier bridge DB1 is directly connected to a zero line of the commercial power, a pin 2 of the rectifier bridge DB1 is grounded, a pin 1 of the rectifier bridge DB1 is connected to a first end of an inductor L1, a first end of a resistor R5 and an anode of a diode D1, a second end of the inductor L1 and a second end of a resistor R5 are connected to an anode of a diode D3, a cathode of the diode D1 is connected to a LED end of a chip U2, a VC end and a GND end of a chip U2 are connected in parallel to a capacitor C7, a GND end of the chip U2, an anode of the capacitor C2 and an anode of the capacitor C2 are connected to an LED + end (i.e., a common anode of the LED lamp), a cathode of the capacitor C2 and an OUT2 end of the chip U2 are connected to a cathode of the LED-1 end (i.e., a cathode of the first LED lamp), a cathode of the chip U2 and an IO end of the chip U2 are connected to a cathode of the chip 2, an LED-OUT 2, an IO end of the chip U2 and an IO end of the chip 2, a Dim2 terminal of a chip U3 is connected to an IO14 terminal of a chip US3, a Rxt1 terminal of the chip U3 is grounded through a resistor RS8, a Rxt2 terminal of the chip U3 is grounded through a resistor RS7, a Vin terminal of the chip U3 is connected to an X + terminal (i.e., connected to a power supply) through a resistor R8, a cathode of a diode D3 and an anode of a capacitor C2 are both connected to a DARIN terminal of the chip U1, a cathode of a capacitor C2 is grounded, an FB terminal of a chip U1 is respectively connected to a first terminal of the resistor R2 and a first terminal of the resistor R3, a second terminal of a resistor R2, a first terminal of an inductor L2, a GND terminal of the chip U1 and a first terminal of the capacitor C3 are both connected to a cathode of the diode D2, an anode of the diode D2 and a first terminal of the resistor R4 are both connected to a first terminal of the capacitor C4, a second terminal of the resistor R3, the second end of the inductor L2, the second end of the resistor R4 and the second end of the capacitor C4 are connected in common to output a 3.3V voltage to be connected with the 3.3V end of the chip US3, and the GND end of the chip US3 is grounded.
The driving circuit in the embodiment is rectified by the rectifying module from the input end, and then is not directly filtered, but is divided into two branches, wherein one branch is the driving module and is responsible for providing current for the work of the LED lamp; the other path is an auxiliary power supply module, stable voltage is provided for the intelligent module, and the intelligent module can accept external dimming and color mixing signals, so that dimming and color mixing of the LED lamp are controlled. The filter part is divided into 2 parts and is respectively placed in the drive module and the auxiliary power supply module, the diode D1 isolates the drive module from an input circuit consisting of the rectifier module and the commercial power, the diode D3 isolates the auxiliary circuit module from the input circuit consisting of the rectifier module and the commercial power, the cathode of the filter circuit in the drive module is not directly grounded but connected to the inside of the drive control circuit, the influence of the charge and discharge of the filter circuit on the input circuit is reduced, the overall power consumption of the auxiliary power supply module is smaller, meanwhile, the filter capacitor C2 adopted by the auxiliary power supply module is smaller, although the cathode of the filter capacitor C2 is directly grounded, due to the isolation effect of the diode D3, the influence of the charge and discharge of the filter capacitor on the input circuit and the drive module can be ignored, the chip U2 and the capacitor C7 are used for eliminating the increase of the PF value along with the increase of the PF value in the circuit, and reducing the influence of the increase of the PF value by the ripple, meanwhile, the change of the driving module and the auxiliary power supply module does not influence the change of the input circuit, so that the PF of the whole circuit is improved.
Claims (5)
1. An LED lamp driving circuit for improving a PF value is characterized by comprising a rectifying module, a first isolation module, a second isolation module, a driving module, an auxiliary power supply module and an intelligent module, the rectifying module is respectively connected with the first isolating module and the second isolating module, the first isolating module is connected with the driving module, the second isolation module is connected with an auxiliary power supply module, the auxiliary power supply module is connected with the driving module through an intelligent module, the first isolation module comprises a diode D1, the anode of the diode D1 is connected with the rectification module, the cathode of the diode D1 is connected to the driving module, the second isolation module includes a diode D3, the anode of the diode D3 is connected with the rectifying module, the cathode of the diode D3 is connected with the auxiliary power supply module, the rectifying module and the second isolation module are connected through an inductor L1 and a resistor R5 which are connected in parallel.
2. The LED lamp driving circuit for improving the PF value according to claim 1, wherein the driving module comprises a driving control circuit and a driving filter circuit, one end of the driving filter circuit is connected to the output terminal of the first isolation module and the anode of the LED lamp, the other end of the driving filter circuit is connected to the output terminal of the driving control circuit and the cathode of the LED lamp, and the input terminal of the driving control circuit is connected to the output terminal of the intelligent module.
3. The LED lamp driving circuit for increasing the PF value of claim 1, wherein the driving module and the first isolation module are connected to each other through a chip U2 and a capacitor C7, wherein the chip U2 is DIO 8241F.
4. The LED lamp driving circuit capable of increasing the PF value as claimed in claim 2, wherein the driving module and the first isolation module are connected to each other through a chip U2 and a capacitor C7, wherein the chip U2 is DIO 8241F.
5. The LED lamp driving circuit for improving the PF value according to claim 1 or 3, wherein the auxiliary power supply module comprises an auxiliary power supply circuit and an auxiliary filter circuit, one end of the auxiliary filter circuit is connected to the output terminal of the second isolation module and the input terminal of the auxiliary power supply circuit, the other end of the auxiliary filter circuit is grounded, and the output terminal of the auxiliary power supply circuit is connected to the intelligent module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911100857.XA CN111385942B (en) | 2019-11-12 | 2019-11-12 | LED lamp driving circuit capable of improving PF value |
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| CN201911100857.XA CN111385942B (en) | 2019-11-12 | 2019-11-12 | LED lamp driving circuit capable of improving PF value |
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| CN111385942B true CN111385942B (en) | 2022-03-11 |
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| WO2013086445A1 (en) * | 2011-12-09 | 2013-06-13 | The Regents Of The University Of California | Switched-capacitor isolated led driver |
| CN203181299U (en) * | 2013-03-15 | 2013-09-04 | 无锡科技职业学院 | Constant-current driving circuit structure for small-power lamps |
| NL2020507B1 (en) * | 2018-02-28 | 2019-09-04 | Eldolab Holding Bv | Power converter for LED |
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|---|---|---|---|---|
| CN204697353U (en) * | 2015-06-23 | 2015-10-07 | 成都亿信标准认证集团有限公司 | There is the compact LED drive circuit improving input current power factor (PF) |
| CN206650890U (en) * | 2017-04-19 | 2017-11-17 | 慈溪锐恩电子科技有限公司 | A kind of tunable optical color-adjustable RGB LEDs of Alternating Current Power Supply |
| CN107787085A (en) * | 2017-10-18 | 2018-03-09 | 浙江凯耀照明股份有限公司 | 0 10V of one kind light modulation isolation LED power circuits |
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