CN219204740U

CN219204740U - Dimming control circuit for alternating current output driving LED lamp tube and fluorescent lamp tube

Info

Publication number: CN219204740U
Application number: CN202320151838.5U
Authority: CN
Inventors: 程雅文; 侯启杭
Original assignee: Guyuan Photoelectric Technology Shanghai Co ltd
Current assignee: Guyuan Photoelectric Technology Shanghai Co ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-06-16
Anticipated expiration: 2033-02-08

Abstract

The utility model provides a dimming control circuit for driving an LED lamp tube and a fluorescent lamp tube by alternating current output, which has the technical scheme that a pulse modulation circuit outputs PWM signals with different duty ratios to a sampling circuit, the sampling circuit processes the PWM signals with different duty ratios and then outputs direct current voltages with different values to a control circuit, the control circuit outputs voltages with different alternating current frequencies to an output circuit, the output circuit is connected with the load LED lamp tube or the fluorescent lamp tube, the control circuit outputs voltages with different alternating current frequencies, the output circuit is driven to output alternating current with different values, and the load LED lamp tube or the fluorescent lamp tube is lightened, so that the dimming purpose is achieved. The dimming circuit has the advantages of being applicable to dimming of the LED lamp tube, being applicable to dimming of the fluorescent lamp tube of the electronic ballast, being compatible with dimming circuits of two lamps, simplifying the types of drivers, saving equipment cost and improving economic benefit.

Description

Dimming control circuit for alternating current output driving LED lamp tube and fluorescent lamp tube

Technical Field

The utility model relates to the field of lamplight illumination, in particular to a power supply for LED illumination and fluorescent lamp illumination

Road technology.

Background

The LED has the characteristics of energy conservation, electricity saving, environmental protection, long service life, small volume, rich colors, flexible combination, strong shock resistance, no noise and the like. LED lamps are currently one of the accepted sources of green light, and have fully penetrated the market. Along with the popularization of LED technology, the LED lamp enriches the lamp market to a great extent, so that the functions of the lamp are more diversified, and the LED lamp tube driven by the electronic ballast is also common in the market. The need to use LED lamps and the control requirements for LED lamps are also constantly increasing. Dimmable LED lamps become increasingly important.

More and more fluorescent lamps have been replaced by LED lamps, and the traditional electronic ballast is mainly matched with fluorescent lamps, and how to perform dimming control on the fluorescent lamps is a problem to be solved quickly by the utility model.

Disclosure of Invention

In order to solve the dimming problem of the traditional electronic ballast fluorescent lamp, the utility model provides a power supply control circuit which is applicable to dimming of an LED lamp and dimming of the electronic ballast fluorescent lamp. The technical scheme of the utility model is that a pulse modulation circuit outputs PWM signals with different duty ratios to a sampling circuit, the sampling circuit processes the PWM signals with different duty ratios and then outputs direct current voltages with different values to a control circuit, the control circuit outputs voltages with different alternating current frequencies to an output circuit, the output circuit is connected with a load LED lamp tube or a fluorescent lamp tube, the control circuit outputs voltages with different alternating current frequencies, the output circuit is driven to output alternating current with different values, and the load LED lamp tube or the fluorescent lamp tube is lightened, so that the dimming purpose is achieved.

The sampling circuit is characterized in that PWM signals output by the pulse modulation circuit are respectively connected with a resistor and a diode, the resistor is connected with a voltage stabilizing source, the diode is connected with another parallel resistor and another parallel capacitor through the resistor, the parallel resistor and the parallel capacitor are connected with the chip IC through the resistor, PWM signals with different duty ratios enable the parallel capacitor to be charged with voltages with different values, the voltage stabilizing source is a capacitor connected with the output circuit, the other end of the capacitor is connected with the diode, and the diode is connected with the parallel voltage stabilizing tube and the capacitor.

The control circuit is an oscillation circuit with a resistor and capacitor combined outside the chip IC, different direct-current voltages are input into the IC chip, the resistor and capacitor combined oscillation circuit outside the chip IC can automatically combine different resistor and capacitor oscillation circuits to generate different alternating-current oscillation frequencies, and the alternating-current oscillation frequencies are output to the output circuit.

The output circuit is a connection point of two serially connected switching tubes, an inductor and a capacitor are serially connected, the capacitor is connected with the LED lamp tube or the fluorescent lamp tube, the inductor is also connected with a capacitor to be grounded, and the LED lamp tube or the fluorescent lamp tube is serially connected with the capacitor to be grounded.

The utility model has the advantages that the utility model is applicable to dimming of the LED lamp tube, also applicable to dimming of the fluorescent lamp tube of the electronic ballast, compatible to dimming circuits of two lamps, simplified in the type of the driver and richer in the diversity of the dimmable lamp tube. The equipment cost is saved, and the economic benefit is improved.

Drawings

FIG. 1 is a circuit block diagram of the present utility model;

FIG. 2 is a diagram of an embodiment of the principle circuit of FIG. 1;

the reference numerals in the figures illustrate:

1-an input circuit comprising a rectifying circuit and a PWM pulse modulation circuit; 2-a control circuit; a 3-output circuit; 4-sampling circuitry.

Detailed Description

Referring to fig. 1 and 2, the PWM pulse modulation circuit of the input circuit 1 outputs PWM signals with different duty ratios to the sampling circuit 4, the sampling circuit 4 processes the PWM signals with different duty ratios, and then outputs dc voltages with different values to the control circuit 2, the control circuit 2 outputs voltages with different ac frequencies to the output circuit 3, the output circuit 3 is connected to the load LED Lamp1, lamp2 or fluorescent Lamp, the control circuit 2 outputs voltages with different ac frequencies fx1 and fx2, the output circuit 3 is driven to output ac currents with different values, and the load LED Lamp or fluorescent Lamp is lightened, so as to achieve the dimming purpose.

The sampling circuit is a PWM signal output by the pulse modulation circuit and is respectively connected with a resistor R12 and a diode D3 at the point bThe resistor R12 is connected with a voltage stabilizing source, the diode D3 is connected with the other parallel resistor R7 and the capacitor C6 through a resistor R11, the parallel resistor R7 and the capacitor C6 are connected with the chip IC through a resistor R10, the type of the IC is L6574D, PWM signals with different duty ratios enable the parallel capacitor C6 to be charged with voltages V2 with different values, and OPIN of the IC is fed ₊ And (3) feet. The voltage stabilizing source is a capacitor C4 connected with the f point of the two series switching tubes Q1 and Q2 of the output circuit 3, the other end of the capacitor C4 is connected with a diode D2, and the diode D2 is connected with a voltage stabilizing tube ZD1 and a capacitor C7 which are connected in parallel. The capacitor C4 obtains alternating current from the Q1 and Q2 switching tubes connected in series, and is stabilized by the voltage stabilizing tube ZD1 and the capacitor C7 after being rectified by the D2.

The control circuit is an oscillating circuit with resistors R3, R4, R5 and R6 and capacitors C1, C2 and C3 connected with the chip IC, different direct-current voltages V2 are input into the IC chip, the oscillating circuit with the resistors and the capacitors connected with the chip IC can automatically combine the oscillating circuits with the different resistors and the capacitors to generate different alternating-current oscillating frequencies, and the alternating-current oscillating frequencies are output to the output circuit.

For example, when the IC starts to operate, C2 and R3 form a loop with oscillation frequency fx1, the IC generates operating frequency fx1, and Q1 and Q2 are driven alternately by R8 and R9, respectively. When the charging voltage V2 on the capacitor C6 changes, it is supplied to the input terminal OPIN of the IC ₊ Then, a voltage V4 equal to V2 is outputted at the IC port OPOUT (point d) through the internal operational amplifier group of the IC. When V5 is higher than V4, D1 is conducted, the oscillation loop is formed by connecting R3 with (R4+R5+R6) in parallel and then with C2, another working frequency fx2 is generated at the moment, and Q1 and Q2 are driven by R8 and R9 in turn respectively.

The output circuit is a connection point f of two series switching tubes Q1 and Q2, and is connected with an inductor T1, a capacitor C8, a capacitor C9 and a capacitor Cn in series, wherein the capacitor is connected with LED Lamp lamps Lamp1, lamp2 or fluorescent Lamp, the inductor T1 is also connected with a capacitor C5 to be grounded, and the LED Lamp or fluorescent Lamp is connected with a capacitor C10 to be grounded in series. Controlling the switching states of Q1 and Q2, wherein T1 and C5 form a series resonant circuit, generating a high voltage between g and i (the high voltage is sufficient to light the fluorescent lamp), and then alternately charging and discharging C10 to light the fluorescent lamp (fluorescent lamp and LED lamp); c4 is connected to the intersection of Q1 and Q2 to obtain alternating current, and D2 and ZD1 are used for rectifying and stabilizing to provide energy for C7.

Dimming is performed by adjusting the duty cycle of the PWM signal by a manual knob or switch.

Claims

1. A dimming control circuit for alternating current output driving LED lamp tubes and fluorescent lamp tubes is characterized in that a pulse modulation circuit outputs PWM signals with different duty ratios to a sampling circuit, the sampling circuit processes the PWM signals with different duty ratios and then outputs direct current voltages with different values to a control circuit, the control circuit outputs voltages with different alternating current frequencies to an output circuit, the output circuit is connected with a load LED lamp tube or a fluorescent lamp tube, the control circuit outputs voltages with different alternating current frequencies, the output circuit is driven to output alternating current with different values, and the load LED lamp tube or the fluorescent lamp tube is lightened, so that the dimming purpose is achieved.

2. The dimming control circuit for driving an LED lamp tube and a fluorescent lamp tube by AC output according to claim 1, wherein the sampling circuit is characterized in that PWM signals output by a pulse modulation circuit are respectively connected with a resistor and a diode, the resistor is connected with a voltage stabilizing source, the diode is connected with another parallel resistor and a capacitor through a resistor, the parallel resistor and the capacitor are connected with a chip IC through a resistor, PWM signals with different duty ratios enable the parallel capacitor to be charged with voltages with different values, the voltage stabilizing source is a capacitor connected with the output circuit, the other end of the capacitor is connected with the diode, and the diode is connected with the voltage stabilizing tube and the capacitor which are connected in parallel.

3. The dimming control circuit for driving an LED lamp tube and a fluorescent lamp tube by AC output according to claim 1, wherein the control circuit is an oscillation circuit with a resistor and capacitor combination externally connected with a chip IC, different DC voltages are input to the IC chip, the resistor and capacitor combination oscillation circuit externally connected with the chip IC can automatically combine different resistor and capacitor oscillation circuits to generate different AC oscillation frequencies, and the different AC oscillation frequencies are output to the output circuit.

4. The dimming control circuit for driving an LED lamp and a fluorescent lamp according to claim 1, wherein the output circuit is a connection point of two series switching tubes, an inductor and a capacitor are connected in series, the capacitor is connected with the LED lamp or the fluorescent lamp, the inductor is also connected with a capacitor to be grounded, and the LED lamp or the fluorescent lamp is connected with a capacitor to be grounded.