CN200973190Y - Controller of LED electric saving lamp - Google Patents

Abstract

The utility model discloses a controller for an LED energy-saving lamp, which comprises a DC power supply composed of a rectification circuit and a filter circuit; the output terminal of the DC power supply is electrically connected with the input terminal of a constant current control circuit; the output terminal of the constant current control circuit terminal is electrically connected to the input terminal of the current amplifying circuit; the output terminal of the current amplifying circuit is electrically connected to the LED lamp holder. The utility model has the advantages of strong versatility, no need for transformers and ballasts, the power factor of the power supply network is 1, and the automatic adjustment of working voltage and working current can be realized according to the different numbers of LED lamps used. Through the current negative feedback circuit, the problem of lighting quality degradation caused by voltage and current fluctuations of the power supply network is overcome. A direct current path is formed by field effect tubes, and the current is amplified to supply power to LED lighting lamps, achieving the purpose of stable power supply with low voltage and small current.

Description

LED energy-saving lamp controller

technical field

The utility model relates to a lighting fixture, in particular to a controller for an LED energy-saving lamp.

Background technique

As a light source, the LED lamp not only consumes less power, but is not easy to be damaged, has a long service life, and has a fast response speed (can be operated at high frequency). It is an ideal energy-saving and environment-friendly lamp. However, due to its strict requirements on current and voltage, it is greatly restricted as a lighting fixture. If different occasions require different brightness, different numbers of LED lights need to be connected in series and parallel reasonably, which requires a dedicated DC power supply to complete.

Utility model content

The purpose of the utility model is to provide an LED energy-saving lamp controller with strong versatility.

In order to achieve the above object, the utility model can take the following technical solutions:

The LED energy-saving lamp controller described in the utility model includes a DC power supply composed of a rectifier circuit and a filter circuit; the output terminal of the DC power supply is electrically connected to the input terminal of the constant current control circuit; the output terminal of the constant current control circuit It is electrically connected with the input end of the current amplifying circuit; the output end of the current amplifying circuit is electrically connected with the LED lamp holder.

The constant current control circuit is composed of a voltage stabilizing circuit, two comparators, an OR gate circuit, an oscillator, an RS flip-flop, a pulse width modulator and an AND gate circuit; the current amplifying circuit is composed of a field effect transistor; the The output terminal of the voltage stabilizing circuit is electrically connected to the inverting input terminal of one comparator, and the inverting input terminal of the other comparator is connected to the reference power supply; the non-inverting input terminals of the two comparators are electrically connected, and the output terminals are respectively connected to the input terminals of the OR gate Electrically connected; the output end of the OR gate circuit is electrically connected to the S end of the RS flip-flop, and the output end of the oscillator is electrically connected to the R end of the RS flip-flop; the two input ends of the AND gate circuit are respectively connected to the RS trigger The output terminals of the device and the pulse width modulator are electrically connected; the output terminals of the AND gate circuit are electrically connected with the gate of the field effect transistor.

The source of the field effect transistor is electrically connected to the non-inverting input terminals of the two comparators to form a current negative feedback circuit.

The utility model has the advantages of strong versatility, no need for transformers and ballasts, power factor of the power supply network is 1, and automatic adjustment of working voltage and working current according to the number of LED lamps used. Through the current negative feedback circuit, the problem of lighting quality degradation caused by voltage and current fluctuations of the power supply network is overcome. A direct current path is formed by field effect tubes, and the current is amplified to supply power to LED lighting lamps, achieving the purpose of stable power supply with low voltage and small current.

Description of drawings

Fig. 1 is the schematic circuit diagram of the utility model.

Detailed ways

As shown in the figure, the LED energy-saving lamp controller described in the utility model includes a DC power supply composed of a rectifier circuit 1 and a filter circuit 2); the output terminal of the DC power supply is electrically connected to the input terminal of the constant current control circuit 3 ; The output end of the constant current control circuit 3 is electrically connected to the input end of the current amplifying circuit; the output end of the current amplifying circuit is electrically connected to the LED lamp holder. The constant current control circuit 3 is made up of a voltage stabilizing circuit 4, two comparators 5,6, an OR gate circuit 7, an oscillator 8, an RS flip-flop 9, a pulse width modulator 10 and an AND gate circuit 11; the current The amplifying circuit is composed of a field effect transistor GATE; the output terminal of the voltage stabilizing circuit 4 is electrically connected to the inverting input terminal of a comparator 6, and the inverting input terminal of the other comparator 5 is connected to the reference power supply; the non-inverting input terminals of the two comparators 5 and 6 The input terminals are electrically connected to each other, and its output terminals are electrically connected to the input terminals of the OR circuit 7 respectively; the output terminals of the OR circuit 7 are electrically connected to the S terminal of the RS flip-flop 9, and the output terminals of the oscillator 8 are electrically connected to the RS. The R terminal of flip-flop 9 is electrically connected; the two input ends of described AND gate circuit 11 are electrically connected with the output end of RS flip-flop 9, pulse width modulator 10 respectively; GATE is electrically connected to the gate. The source of the field effect transistor GATE is electrically connected to the non-inverting input terminals of the two comparators 5 and 6 to form a current negative feedback circuit.

Claims (3)

1, a kind of LED energy-saving lamp controller, it comprises the DC power supply that is made up of rectification circuit (1), filter circuit (2); It is characterized in that: described DC power supply output end and constant current control circuit (3) input end electrical connection; the output end of the constant current control circuit (3) is electrically connected to the input end of the current amplifying circuit; the output end of the current amplifying circuit is electrically connected to the LED lamp holder. 2. The LED energy-saving lamp controller according to claim 1, characterized in that: the constant current control circuit (3) is composed of a voltage stabilizing circuit (4), two comparators (5, 6), and an OR gate circuit ( 7), an oscillator (8), an RS flip-flop (9), a pulse width modulator (10) and an AND gate circuit (11); the current amplifying circuit is made up of a field effect transistor (GATE); the voltage regulator The output terminal of the circuit (4) is electrically connected to the inverting input terminal of a comparator (6), and the inverting input terminal of the other comparator (5) is connected to the reference power supply; the non-inverting input terminals of the two comparators (5, 6) are electrically connected, Its output terminal is electrically connected with the input terminal of described OR gate circuit (7) respectively; The output end is electrically connected to the (R) end of the RS flip-flop (9); the two input ends of the AND gate circuit (11) are electrically connected to the output ends of the RS flip-flop (9) and the pulse width modulator (10) respectively. connected; the output terminal of the AND gate circuit (11) is electrically connected with the gate of the field effect transistor (GATE). 3. The LED energy-saving lamp controller according to claim 2, characterized in that: the source of the field effect transistor (GATE) is electrically connected to the non-inverting input terminals of the two comparators (5, 6) to form a current negative feedback circuit.

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