CN216146494U

CN216146494U - LED constant voltage power supply intelligent power PFC boost segmented control circuit

Info

Publication number: CN216146494U
Application number: CN202121839382.9U
Authority: CN
Inventors: 羊红军
Original assignee: Shenzhen Shenchuan Intelligent Co ltd
Current assignee: Shenzhen Shenchuan Intelligent Co ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-03-29
Anticipated expiration: 2031-08-06

Abstract

The utility model discloses an LED constant voltage power supply intelligent power PFC boost subsection control circuit, which comprises: the first module is electrically connected with the second module and the third module respectively, and the second module is electrically connected with the third module; the first module includes: the power supply comprises an EMC rectifying circuit, an active PFC boosting circuit and a boosting sectional circuit; the second module comprises a main isolation driving circuit and an intelligent control circuit; the third module includes: controlling the low power consumption circuit. The utility model can enable the first module to output different working voltages when the input voltages are different, is beneficial to improving the utilization efficiency of electric energy and avoiding the MOS tube from being damaged or burnt due to excessive loss, and can improve the safety performance of the circuit and save energy; the control circuit can be in a low power consumption mode, and power consumption reduction and green energy conservation are facilitated.

Description

LED constant voltage power supply intelligent power PFC boost segmented control circuit

Technical Field

The utility model relates to the technical field of LED driving, in particular to an intelligent power PFC boost segmented control circuit of an LED constant-voltage power supply.

Background

In the LED driving circuit, an alternating current voltage of 110V-265V is input into a conventional power supply, and an active PFC boost boosts an output voltage to 380V to obtain a higher power factor, but when the input voltage is lower than 120V, because the ratio of the voltage difference between input and output is increased, the output duty ratio of the active PFC circuit is increased, the loss is increased due to the increase of the current of a PFC boost switch MOS tube and an energy inductor, the MOS tube is possibly damaged or even burnt by fire, and a potential safety hazard exists.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides an intelligent power PFC boost segmented control circuit of an LED constant-voltage power supply.

The technical scheme of the utility model is as follows: the utility model provides an LED constant voltage power supply intelligent power PFC boost subsection control circuit, which comprises: the first module is electrically connected with the second module and the third module respectively, and the second module is electrically connected with the third module; the first module includes: the power supply comprises an EMC rectifying circuit, an active PFC boosting circuit and a boosting sectional circuit; the second module comprises a main isolation driving circuit and an intelligent control circuit; the third module includes: the control low-power-consumption circuit, EMC rectifier circuit with active PFC boost circuit electric connection, active PFC boost circuit with boost segment circuit, main isolation drive circuit, control low-power-consumption circuit electric connection, main isolation drive circuit with intelligent control circuit electric connection.

Further, the first module comprises a chip U1, and the chip U1 comprises an INP pin, a COMP pin, a MULT pin, a CS pin, a ZCD pin, a GND pin, a GD pin and a VCC pin.

Further, the model of the chip U1 is OB 6563.

Further, the second module includes a chip U2, the chip U2 includes: SS pin, FB pin, CS pin, GND pin, GATE pin, VDD pin, PFCVCC pin, DEM pin.

Further, the model of the chip U2 is OB 2203.

Further, the boost segment circuit includes: a transistor Q4, a transistor Q5, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, and a polarity capacitor EC8, wherein the transistor Q4 and the transistor Q5 are NPN transistors, one end of the resistor R40 is electrically connected to the terminal Vout1, the other end of the resistor R40 is electrically connected to the base of the transistor Q4, the collector of the transistor Q4 is electrically connected to the terminal VCC, the emitter of the transistor Q4 is electrically connected to one end of the resistor R41, the other end of the resistor R41 is electrically connected to one end of the resistor R42, the first end of the resistor R43, and the anode of the polarity capacitor EC8, the other end of the resistor R43 is electrically connected to the base of the transistor Q5, the other end of the resistor R42, the cathode of the polarity capacitor EC8, and the emitter of the transistor Q5 are all grounded, the collector of the transistor R45 is electrically connected to one end of the resistor R45, the other end of the resistor R45 is electrically connected with one end of the resistor R44, the other end of the resistor R44 is electrically connected with a Vout2 end, the Vout1 end is electrically connected with an input voltage detection end, and the Vout2 end is electrically connected with a COMP pin of the chip U1.

Further, the intelligent control circuit comprises: a resistor R32, a resistor R67, a resistor R68, a resistor R15, a resistor R16, a resistor R33, a resistor R21, a diode ZD 21, a transistor Q21 and a MOS transistor QN 21, wherein the transistor Q21 is an NPN transistor, the MOS transistor QN 21 is an NMOS transistor, a first end of the resistor R21 is electrically connected with a +12VDC/24VDC terminal, the other end of the resistor R21 is electrically connected with a negative electrode of the diode ZD 21, an anode of the diode ZD 21 is electrically connected with one end of the resistor R21, a negative electrode of the diode ZD 21 and a collector of the transistor Q21, the other end of the resistor R21 is electrically connected with one end of the resistor R21 and a gate of the MOS transistor QN 21, a base of the transistor Q21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 and the PWM transistor Q21 are electrically connected with the resistor PWM 21, the other end of the resistor R68 is electrically connected with the PWM2 end, the other end of the resistor R15, the emitter of the triode Q6, the anode of the diode ZD2, the other end of the resistor R21 and the source of the MOS tube QN1 are all grounded, the drain of the MOS tube QN1 is electrically connected with the-LED.OUT end, wherein the +12VDC/24VDC end is connected with the anode of the load, and the PWM1 end and the PWM2 end are respectively connected with a PWM signal end, and the-LED.OUT end is connected with the cathode of the load.

By adopting the scheme, the utility model has the beneficial effects that: the first module can output different working voltages when the input voltages are different, so that the utilization efficiency of electric energy is improved, the MOS tube is prevented from being damaged or burnt due to excessive loss, the safety performance of the circuit can be improved, and the circuit is green and energy-saving; the control circuit can be in a low power consumption mode, and power consumption reduction and green energy conservation are facilitated.

Drawings

Fig. 1 is a block diagram of a boost segmented control circuit of an intelligent power PFC of an LED constant voltage power supply according to the present invention.

Fig. 2 is a circuit diagram of a boost segment circuit according to an embodiment of the utility model.

Fig. 3 is a circuit diagram of an intelligent control circuit according to an embodiment of the utility model.

Fig. 4 is a circuit diagram of a control low power consumption circuit according to an embodiment of the utility model.

Fig. 5A and 5B are circuit diagrams of an LED constant voltage power supply intelligent power PFC boost segmented control circuit according to an embodiment of the present invention.

Detailed Description

The utility model is described in detail below with reference to the figures and the specific embodiments.

Referring to fig. 1 to fig. 5B, in the present embodiment, the present invention provides an intelligent power PFC boost segmented control circuit for an LED constant voltage power supply, including: the module comprises a first module 7, a second module 11 and a third module 14, wherein the first module 7 is respectively electrically connected with the second module 11 and the third module 14, and the second module 11 is electrically connected with the third module 14; the first module 7 comprises: an EMC rectification circuit 8, an active PFC boost circuit 9 and a boost segmented circuit 10; the second module 11 comprises a main isolation driving circuit 12 and an intelligent control circuit 13; the third module 14 comprises: the control low-power-consumption circuit 15, the EMC rectifying circuit 8 and the active PFC boost circuit 9 are electrically connected, the active PFC boost circuit 9 is electrically connected with the boost segmented circuit 10, the main isolation driving circuit 12 and the control low-power-consumption circuit 15, and the main isolation driving circuit 12 is electrically connected with the intelligent control circuit 13. The first module 7 is electrically connected to the current input end, and can output 380VDC or 260VDC according to the magnitude of the input ac voltage. The second module 11 may control the working power of the load LED lamp according to the control of the PWM signal. The third module 14 can control the working state of the first module 7, so that the LED constant voltage power supply intelligent power PFC boost segmented control circuit can be controlled to work in a low power consumption mode.

Further, the first module 7 includes a chip U1 with a model OB6563, and the chip U1 includes an INP pin, a COMP pin, a MULT pin, a CS pin, a ZCD pin, a GND pin, a GD pin, and a VCC pin.

Further, the second module 11 includes a chip U2, model OB2203, and the chip U2 includes: SS pin, FB pin, CS pin, GND pin, GATE pin, VDD pin, PFCVCC pin, DEM pin.

Specifically, the boost section circuit 10 includes: a transistor Q4, a transistor Q5, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, and a polarity capacitor EC8, wherein the transistor Q4 and the transistor Q5 are NPN transistors, one end of the resistor R40 is electrically connected to the terminal Vout1, the other end of the resistor R40 is electrically connected to the base of the transistor Q4, the collector of the transistor Q4 is electrically connected to the terminal VCC, the emitter of the transistor Q4 is electrically connected to one end of the resistor R41, the other end of the resistor R41 is electrically connected to one end of the resistor R42, the first end of the resistor R43, and the anode of the polarity capacitor EC8, the other end of the resistor R43 is electrically connected to the base of the transistor Q5, the other end of the resistor R42, the cathode of the polarity capacitor EC8, and the emitter of the transistor Q5 are all grounded, the collector of the transistor R45 is electrically connected to one end of the resistor R45, the other end of the resistor R45 is electrically connected with one end of the resistor R44, the other end of the resistor R44 is electrically connected with a Vout2 end, the Vout1 end is electrically connected with an input voltage detection end, and the Vout2 end is electrically connected with a COMP pin of the chip U1.

Specifically, the intelligent control circuit 13 includes: a resistor R32, a resistor R67, a resistor R68, a resistor R15, a resistor R16, a resistor R33, a resistor R21, a diode ZD 21, a transistor Q21 and a MOS transistor QN 21, wherein the transistor Q21 is an NPN transistor, the MOS transistor QN 21 is an NMOS transistor, a first end of the resistor R21 is electrically connected with a +12VDC/24VDC terminal, the other end of the resistor R21 is electrically connected with a negative electrode of the diode ZD 21, an anode of the diode ZD 21 is electrically connected with one end of the resistor R21, a negative electrode of the diode ZD 21 and a collector of the transistor Q21, the other end of the resistor R21 is electrically connected with one end of the resistor R21 and a gate of the MOS transistor QN 21, a base of the transistor Q21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 and the PWM transistor Q21 are electrically connected with the resistor PWM 21, the other end of the resistor R68 is electrically connected with the PWM2 end, the other end of the resistor R15, the emitter of the triode Q6, the anode of the diode ZD2, the other end of the resistor R21 and the source of the MOS tube QN1 are all grounded, the drain of the MOS tube QN1 is electrically connected with the-LED.OUT end, wherein the +12VDC/24VDC end is connected with the anode of the load, and the PWM1 end and the PWM2 end are respectively connected with a PWM signal end, and the-LED.OUT end is connected with the cathode of the load.

With reference to fig. 1 to 5B, in the present scheme, an externally input AC power is subjected to EMC interference rejection and AC-DC rectification output through the EMC rectification circuit 8, and the active PFC boost circuit 9 and the boost segmented circuit 10 are used to implement power factor correction, effectively improve the utilization rate of power grid resources, reduce harmonics, and do not generate stroboflash. When the external input voltage is 220VAC, the input voltage is divided by a resistor R24, a resistor R25 and a resistor 36 to enable the triode Q4 to be conducted, so that the triode Q5 is conducted, at this time, a resistor R26, a resistor R27 and a resistor R28 are connected in series to form a PFC boost output high potential, the resistor R44 and the resistor R45 are connected in parallel with a resistor R75 after being serially connected to form an output low potential detection voltage to an INV pin of the chip U1, the chip U1 works by controlling the conduction of an MOS transistor G1 through a GD pin, and therefore the first module 7 outputs a constant voltage 380V through a + Vbus end; when the voltage input from the outside is 110VAC, the triode Q4 is not conducted, the triode Q5 is also not conducted, the resistor R26, the resistor R27 and the resistor R28 are connected in series to form a PFC boost output high potential, and the resistor R75 is used for outputting a low potential detection voltage to an INV pin of the chip U1, so that the chip U1 controls the conduction time of the MOS transistor Q1 to realize the output of a constant voltage 265V. This scheme can be according to the voltage of the change output of input, can avoid MOS pipe Q1 loss increase and transformer T2's the loss increase of during operation prevents MOS pipe Q1 produces and damages and burns out the scheduling problem, helps promoting the security performance, can change power factor simultaneously, improves energy utilization efficiency, realizes better energy-conserving effect. The main isolation driving circuit 12 and the intelligent control circuit 13 are used for controlling a circuit for converting high-voltage power into isolated safe low-voltage output. The voltage output by the + Vbus end of the first module 7 is transformed by a transformer T1 and then is used for being provided for a load LED to work, a resistor R32 and a diode ZD1 are connected in series to provide voltage for the resistor R33, so that the MOS transistor QN1 is conducted, the PWM1 end and the PWM2 end are respectively connected with a PWM signal end, pulse duty ratio signals provided by the PWM1 end and the PWM2 end are adjusted to control the conduction of the triode Q6, and therefore the conduction of the MOS transistor QN1 is controlled, and therefore the working power of the load LED is controlled. When the intelligent control circuit 13 works to change the power of the load LED, in the control low-power-consumption circuit 15, the CS pin of the chip U2 enters a low-power-consumption mode after comparison and error amplification are performed, and the PFCVCC pin of the chip U2 stops outputting the voltage VCC, so that the chip U1 has no driving voltage, the active PFC boost circuit 9 does not work, and the power supply enters a low-power-consumption working mode, which can reduce power consumption.

In conclusion, the first module can output different working voltages when the input voltages are different, so that the utilization efficiency of electric energy is improved, the MOS transistor is prevented from being damaged or burnt due to excessive loss, the safety performance of the circuit can be improved, and the circuit is green and energy-saving; the control circuit can be in a low power consumption mode, and the power consumption reduction and green energy conservation are facilitated

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a LED constant voltage power supply intelligence power PFC boost segmentation control circuit which characterized in that includes: the first module is electrically connected with the second module and the third module respectively, and the second module is electrically connected with the third module; the first module includes: the power supply comprises an EMC rectifying circuit, an active PFC boosting circuit and a boosting sectional circuit; the second module comprises a main isolation driving circuit and an intelligent control circuit; the third module includes: the control low-power-consumption circuit, EMC rectifier circuit with active PFC boost circuit electric connection, active PFC boost circuit with boost segment circuit, main isolation drive circuit, control low-power-consumption circuit electric connection, main isolation drive circuit with intelligent control circuit electric connection.

2. The LED constant voltage power supply intelligent power PFC boost section control circuit of claim 1, characterized in that said first module comprises a chip U1, said chip U1 comprises an INP pin, a COMP pin, a MULT pin, a CS pin, a ZCD pin, a GND pin, a GD pin, and a VCC pin.

3. The LED constant voltage power supply intelligent power PFC boost section control circuit of claim 2, characterized in that the model of said chip U1 is OB 6563.

4. The LED constant voltage power supply intelligent power PFC boost section control circuit of claim 2, wherein said second module includes a chip U2, said chip U2 including: SS pin, FB pin, CS pin, GND pin, GATE pin, VDD pin, PFCVCC pin, DEM pin.

5. The LED constant voltage power supply intelligent power PFC boost section control circuit of claim 4, characterized in that the model of said chip U2 is OB 2203.

6. The LED constant voltage power supply intelligent power PFC boost section control circuit of any one of claims 2 to 5, characterized in that said boost section circuit comprises: a transistor Q4, a transistor Q5, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, and a polarity capacitor EC8, wherein the transistor Q4 and the transistor Q5 are NPN transistors, one end of the resistor R40 is electrically connected to the terminal Vout1, the other end of the resistor R40 is electrically connected to the base of the transistor Q4, the collector of the transistor Q4 is electrically connected to the terminal VCC, the emitter of the transistor Q4 is electrically connected to one end of the resistor R41, the other end of the resistor R41 is electrically connected to one end of the resistor R42, the first end of the resistor R43, and the anode of the polarity capacitor EC8, the other end of the resistor R43 is electrically connected to the base of the transistor Q5, the other end of the resistor R42, the cathode of the polarity capacitor EC8, and the emitter of the transistor Q5 are all grounded, the collector of the transistor R45 is electrically connected to one end of the resistor R45, the other end of the resistor R45 is electrically connected with one end of the resistor R44, the other end of the resistor R44 is electrically connected with a Vout2 end, the Vout1 end is electrically connected with an input voltage detection end, and the Vout2 end is electrically connected with a COMP pin of the chip U1.

7. The LED constant voltage power supply intelligent power PFC boost section control circuit as claimed in any one of claims 1 to 5, characterized in that said intelligent control circuit comprises: a resistor R32, a resistor R67, a resistor R68, a resistor R15, a resistor R16, a resistor R33, a resistor R21, a diode ZD 21, a transistor Q21 and a MOS transistor QN 21, wherein the transistor Q21 is an NPN transistor, the MOS transistor QN 21 is an NMOS transistor, a first end of the resistor R21 is electrically connected with a +12VDC/24VDC terminal, the other end of the resistor R21 is electrically connected with a negative electrode of the diode ZD 21, an anode of the diode ZD 21 is electrically connected with one end of the resistor R21, a negative electrode of the diode ZD 21 and a collector of the transistor Q21, the other end of the resistor R21 is electrically connected with one end of the resistor R21 and a gate of the MOS transistor QN 21, a base of the transistor Q21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 is electrically connected with one end of the resistor R21, the other end of the resistor R21 and the PWM transistor Q21 are electrically connected with the resistor PWM 21, the other end of the resistor R68 is electrically connected with the PWM2 end, the other end of the resistor R15, the emitter of the triode Q6, the anode of the diode ZD2, the other end of the resistor R21 and the source of the MOS tube QN1 are all grounded, the drain of the MOS tube QN1 is electrically connected with the-LED.OUT end, wherein the +12VDC/24VDC end is connected with the anode of the load, and the PWM1 end and the PWM2 end are respectively connected with a PWM signal, and the-LED.OUT end is connected with the cathode of the load.