CN213586374U - Power factor circuit for improving linear LED lamp - Google Patents
Power factor circuit for improving linear LED lamp Download PDFInfo
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- CN213586374U CN213586374U CN202022205820.8U CN202022205820U CN213586374U CN 213586374 U CN213586374 U CN 213586374U CN 202022205820 U CN202022205820 U CN 202022205820U CN 213586374 U CN213586374 U CN 213586374U
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Abstract
A power factor circuit for improving linear LED lamps comprises a rectifying circuit, an electrolytic capacitor charging and discharging circuit, a linear constant current circuit and at least one LED light source which are sequentially connected, wherein an input end on one side of the rectifying circuit is connected with an external power grid alternating current power supply, an output end on the other side of the rectifying circuit is connected with an electrolytic capacitor charging and discharging circuit, the electrolytic capacitor charging and discharging circuit filters rectified voltage and then supplies power to the linear constant current circuit, and the linear constant current circuit controls at least one LED light source through chip driving arranged in a linear constant current.
Description
Technical Field
The utility model relates to an improve power factor circuit of linear LED lamp belongs to the circuit design field.
Background
With the rapid development of the internet in recent years, north america, south america, and europe have become major markets for intelligent lighting products. In order to meet the requirement that the power factor in the authentication of each country is larger than 0.7, the existing intelligent lighting products usually use a valley filling circuit or an APFC circuit, and the circuit has high cost and large occupied space and is not suitable for small-size light source products. In order to solve the problems, the invention provides a circuit for improving the power factor of a linear LED lamp, which mainly comprises a rectifying circuit, an electrolytic capacitor charging and discharging circuit, a linear constant current circuit and an LED light source.
Disclosure of Invention
The utility model discloses a power factor of intelligent illumination product is mainly improved to the purpose, makes the product satisfy the power factor in North America, south America, European authentication and is greater than 0.7's requirement, in order to realize foretell purpose, the utility model discloses a following technical scheme: a circuit for improving the power factor of a linear LED lamp comprises a rectifying circuit, an electrolytic capacitor charging and discharging circuit, a linear constant current circuit and an LED light source which are sequentially connected, wherein the input end of one side of the rectifying circuit is connected with an external power grid alternating current power supply, the output end of the other side of the rectifying circuit is connected with the electrolytic capacitor charging and discharging circuit, the electrolytic capacitor charging and discharging circuit filters rectified voltage and then supplies power to the linear constant current circuit, and the linear constant current circuit controls the LED light source through a constant current driving chip and a control module.
Preferably, the method comprises the following steps: the electrolytic capacitor charging and discharging circuit comprises a resistor R2, a resistor R3, an electrolytic capacitor C1 and a diode D1, wherein the anode of the input end of the rectifying circuit is connected with the cathode of a resistor R2 and a diode D1, the other end of the resistor R2 and the anode of the diode are connected with the anode of an electrolytic capacitor C1, the two ends of the resistor R3 are connected with the anode and the cathode of an electrolytic capacitor C1, the anode of the rectifying circuit is connected with the anode of a constant current linear circuit and the anode of an LED light source, the cathode of the constant current linear circuit is connected with the cathode of the LED light source, when the input voltage is higher than the LED + voltage, the input voltage charges the electrolytic capacitor C1 through the resistor R2, and when the input voltage is lower than the LED +, the electrolytic capacitor discharges the LED light source through the diode D1.
Preferably, the method comprises the following steps: the electrolytic capacitor charging and discharging circuit comprises a resistor R2, a resistor R3, an electrolytic capacitor C1 and a diode D1, wherein the anode of the input end of the rectifying circuit is connected with the cathode of a resistor R2 and the cathode of a diode D1, the other end of the resistor R2 and the anode of the diode are connected with the anode of an electrolytic capacitor C1, one end of a resistor R3 is connected with the anode of the input end of the rectifying circuit, the other end of the resistor R3 is connected with the cathode of an electrolytic capacitor C1, the cathode of the constant current linear circuit is connected with the cathode of the LED light source, when the input voltage is higher than the LED + voltage, the input voltage charges the electrolytic capacitor C1 through the resistor R2, and when the input voltage is lower than the LED +, the electrolytic capacitor discharges the.
Preferably, the method comprises the following steps: and a fusing fuse F1 is also arranged at the connection position of the rectifying circuit and an external power grid alternating current power supply.
Preferably, the method comprises the following steps: and a constant current driving chip and a control module with dimming and color mixing functions or a constant current driving chip and a control module without dimming and color mixing functions are arranged in the linear constant current circuit.
Preferably, the method comprises the following steps: the LED light source is one path of LED light source or a plurality of paths of LED light sources which can be independently controlled.
Compared with the prior art, the utility model has the following effect:
1. compared with the prior art such as a valley filling circuit or an APFC circuit, the cost advantage is obvious, the volume is small, the circuit is suitable for being made into small-size products such as intelligent light sources,
2. compared with the scheme of increasing the resistance value of the input end resistor of the rectifying circuit to improve the power factor, the scheme of reducing the resistance value of the input end resistor of the rectifying bridge to improve the efficiency is high.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is another schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, and as shown in fig. 1-2, the power factor improving circuit for a linear LED lamp includes a rectifier circuit 1, an electrolytic capacitor charging and discharging circuit 2, a linear constant current circuit 3, and an LED light source 4, which are connected in sequence, wherein an input end of one side of the rectifier circuit 1 is connected to an external power grid ac power supply, an output end of the other side is connected to the electrolytic capacitor charging and discharging circuit 2, the electrolytic capacitor charging and discharging circuit 2 filters rectified voltage and supplies power to the linear constant current circuit 3, the linear constant current circuit 3 controls the LED light source 6 through a constant current driving chip 4 and a control module 5, the electrolytic capacitor charging and discharging circuit 2 includes a resistor R2, a resistor R3, an electrolytic capacitor C1, and a diode D1, an anode of an input end of the rectifier circuit 1 is connected to a resistor R2 and a cathode of the diode D1, and the other end of the resistor R2 and the anode of the diode are connected to, the two ends of a resistor R3 are connected with the anode and the cathode of an electrolytic capacitor C1, the anode of the rectification circuit 1 is connected with the anode of a constant current linear circuit 3 and the anode of an LED light source 6, the cathode of the constant current linear circuit 3 is connected with the cathode of the LED light source 6, or one end of a resistor R3 is connected with the anode of the input end of the rectification circuit 1, the other end of the resistor R3 is connected with the cathode of an electrolytic capacitor C1, the cathode of the constant current linear circuit 3 is connected with the cathode of the LED light source 6, when the input voltage is higher than the LED + voltage, the input voltage charges an electrolytic capacitor C1 through the resistor R2, when the input voltage is lower than the LED +, the electrolytic capacitor discharges the LED light source 6 through a diode D1, a fuse F1 is further arranged at the connection part of the rectification circuit 1 and an external grid alternating current power supply, a constant current driving chip 4 and a control module 5 with dimming and color mixing functions or a constant current driving, the LED light source 6 is a single-path LED light source or a plurality of paths of LED light sources 6 which can be independently controlled.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A circuit for improving the power factor of a linear LED lamp comprises a rectifying circuit, an electrolytic capacitor charging and discharging circuit, a linear constant current circuit and an LED light source which are sequentially connected, and is characterized in that the input end of one side of the rectifying circuit is connected with an external power grid alternating current power supply, the output end of the other side of the rectifying circuit is connected with the electrolytic capacitor charging and discharging circuit, the electrolytic capacitor charging and discharging circuit filters rectified voltage and then supplies power to the linear constant current circuit, and the linear constant current circuit controls the LED light source through a constant current driving chip and a control module.
2. The circuit of claim 1, wherein the charging and discharging circuit of the electrolytic capacitor comprises a resistor R2, a resistor R3, an electrolytic capacitor C1 and a diode D1, the positive terminal of the input end of the rectifying circuit is connected to the resistor R2 and the negative terminal of the diode D1, the other terminal of the resistor R2 and the positive terminal of the diode are connected to the positive terminal of the electrolytic capacitor C1, the two terminals of the resistor R3 are connected to the positive terminal and the negative terminal of the electrolytic capacitor C1, the positive terminal of the rectifying circuit is connected to the positive terminal of the constant current linear circuit and the positive terminal of the LED light source, the negative terminal of the constant current linear circuit is connected to the negative terminal of the LED light source, when the input voltage is higher than the LED + voltage, the input voltage charges the electrolytic capacitor C1 through the resistor R2, and when the input voltage is lower than the LED +, the electrolytic capacitor discharges the LED light source through the diode D1.
3. The circuit of claim 1, wherein the charging and discharging circuit of the electrolytic capacitor comprises a resistor R2, a resistor R3, an electrolytic capacitor C1 and a diode D1, the positive terminal of the input end of the rectifying circuit is connected to the resistor R2 and the negative terminal of the diode D1, the other terminal of the resistor R2 and the positive terminal of the diode are connected to the positive terminal of the electrolytic capacitor C1, one terminal of the resistor R3 is connected to the positive terminal of the input end of the rectifying circuit, the other terminal is connected to the negative terminal of the electrolytic capacitor C1, the negative terminal of the constant current linear circuit is connected to the negative terminal of the LED light source, when the input voltage is higher than the LED + voltage, the input voltage charges the electrolytic capacitor C1 through the resistor R2, and when the input voltage is lower than the LED +, the electrolytic capacitor discharges the LED light source through the diode D1.
4. The circuit for improving the power factor of the linear LED lamp as claimed in claim 1, 2 or 3, wherein a fuse F1 is further disposed at the connection of the rectifying circuit and the external AC power supply.
5. The circuit of claim 1, wherein the linear constant current circuit is provided with a constant current driving chip and a control module with dimming and color-adjusting functions or a constant current driving chip and a control module without dimming and color-adjusting functions.
6. The circuit of claim 1, wherein the LED light source is a single LED light source or a plurality of independently controllable LED light sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022205820.8U CN213586374U (en) | 2020-09-30 | 2020-09-30 | Power factor circuit for improving linear LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022205820.8U CN213586374U (en) | 2020-09-30 | 2020-09-30 | Power factor circuit for improving linear LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213586374U true CN213586374U (en) | 2021-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022205820.8U Active CN213586374U (en) | 2020-09-30 | 2020-09-30 | Power factor circuit for improving linear LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213586374U (en) |
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2020
- 2020-09-30 CN CN202022205820.8U patent/CN213586374U/en active Active
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