CN201795316U - Constant current LED lighting - Google Patents

Abstract

The utility model discloses a constant-current LED illuminating lamp, which is characterized by comprising a power rectifier filter circuit, a regulated-voltage constant-current LED driving circuit and an LED illumination control circuit, wherein the power rectifier filter circuit consists of a fuse FT1, bridge rectifiers D1-D4, filter voltage stabilizing capacitors C1-C5, inductors L1-L2, a diode D5, an integrated voltage stabilizing block U1 and the like which are connected, the regulated-voltage constant-current LED driving circuit consists of a triode T1, an optical coupler detection controller U2, a voltage stabilizing diode D6, resistors R1-R3 and the like which are connected, and the LED illumination control circuit consists of an illumination converting switch SW1, high-brightness warm white high-power light emitters LED1-LED7 and voltage stabilizing tubes D11-D17 which are connected. The constant-current LED illuminating lamp has the advantages of high luminous efficiency, fine light quality, electricity and energy conservation, wide applicable range of voltage, long service life, stable performance and the like.

Description

Constant current LED lighting

technical field

The utility model relates to an illuminating lamp, in particular to a constant current LED illuminating lamp.

Background technique

At present, incandescent lamps and fluorescent lamps or electronic energy-saving lamps are commonly used as lighting lamps. Traditional incandescent lamps have disadvantages such as low luminous efficiency, poor luminous quality, short service life and high energy consumption. The quality is high, but the electromagnetic interference is large, the voltage adaptation range is narrow, and the service life is short.

Utility model content

The problem to be solved by the utility model is how to provide a constant current LED lighting lamp. The utility model constant current LED lighting lamp has the following characteristics: high luminous efficiency, good light quality, power saving and energy saving, wide voltage adaptability range and long service life and stable performance.

The technical problem proposed by the utility model is solved by constructing a constant-current LED lighting lamp, which is characterized in that it includes a power supply rectification filter circuit, a voltage-stabilizing constant-current LED drive circuit and an LED illuminance control circuit. The power supply rectification and filtering circuit is composed of insurance FT1, bridge rectifier D1-D4, filtering and stabilizing capacitors C1-C5, inductors L1-L2, diode D5 and integrated voltage stabilizing block U1; the voltage stabilizing constant current LED drive The circuit is composed of triode T1, optocoupler detection and control device U2, Zener diode D6 and resistors R1-R3; the LED illumination control circuit is composed of illumination conversion switch SW1, high-brightness warm white high-power luminous body LED1-LED7 It is formed by connecting with voltage regulator tubes D11-D17.

According to the constant current LED lighting provided by the utility model, the characteristic is that the illuminance changeover switch SW1 is a six-position rotary switch.

The utility model has the beneficial effects of high luminous efficiency, good light quality, adjustable brightness, energy-saving power, wide voltage range, long service life and stable performance, and can be used as an eye-protecting desk lamp.

Description of drawings

Accompanying drawing 1 is the circuit structure diagram of the present utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, any voltage within the AC 80V-270V range is formed by insurance RT1, bridge rectifiers (D1-D4), capacitors (C2, C3, C4, C5), and inductors (L1, L2) to form a π-type filter The device outputs DC voltage, one way is supplied to the LED illuminant through R1, and the other way is through the triode T1, resistor R2, optocoupler U2, and highly integrated voltage regulator U1 for sampling, analysis, comparison and control to form a constant voltage and constant current LED driver. Circuit, D6 is the Zener diode of the base of the triode T1, D5 is the fast recovery diode, U1 is a highly stabilized integrated block, the (1) pin of the optocoupler U2 is connected to one end of the resistor R2, and the (2) of the optocoupler The pin is connected to the negative pole of the output, the (3) pin of the optocoupler is connected to the (2) pin of the highly stabilized integrated block U1, and the (4) pin of the optocoupler is connected to the output ground of the rectifier (D1-D4). When the voltage at both ends of the LED luminous body A and B decreases due to the change of the grid voltage, the base potential of the constant current sampling comparator T1 decreases, and the ec current of T1 increases, passing through R2, optocoupler (1), (2) pins As the current increases, the current of the optocoupler (3) and (4) decreases, the potential of the pin (3) of the highly stabilized integrated block U1 drops to the ground, and the voltage of the A and B terminals increases; due to the change of the grid voltage, it is sent to the LED to emit light When the voltage across the body A and B rises, the base potential of the constant current sampling comparator T1 rises, the ec current of T1 decreases, and the current through R2 and optocoupler (1), (2) pins decreases, and the optocoupler The current of devices (3) and (4) decreases, the ground potential of pin (3) of highly stabilized integrated block U1 rises, and the voltage of A and B terminals decreases, that is, the voltage at both ends of LED luminous body A and B is kept constant. In Figure 1, C1, C6, and C8 are high-frequency filter capacitors, C7 is a voltage-stabilizing low-frequency filter capacitor; SW1 is a manual rotary switch, LED1 and LED2 light up when the contact touches contact 1, and light when the contact touches contact 2 LED1-LED3 lights up, LED1-LED4 lights up when the contact touches 3 contacts, LED1-LED5 lights up when the contact touches 4 contacts, LED1-LED6 lights up when the contact touches 5 contacts, and touches 6 contacts LEDs are all lit up when the power is on; D11-D17 are zener diodes connected in parallel with the LEDs respectively. One is to prevent the single voltage of the LED illuminant from being too high and damage the LED illuminant at the moment of power-on. When the circuit breaks due to damage, the zener diodes connected in parallel on this luminous body will break down and conduct, ensuring that other LED luminous bodies in series can emit light normally.

The utility model can also be made various alternative ways, above by the specific implementation manner of the embodiment shown in accompanying drawing 1, is that the above-mentioned content of the utility model is described in detail further, but should not be interpreted as this utility model The scope of the novel above-described subject matter is limited only to the examples described. Without departing from the above-mentioned technical idea of the present utility model, various replacements and changes made according to ordinary technical knowledge and conventional means in the art shall be included within the scope of the present utility model.

Claims (2)

1. A constant current type LED lighting lamp, characterized in that: comprise a power supply rectification filter circuit, a constant voltage constant current LED driver circuit and an LED illuminance control circuit; the power supply rectification filter circuit consists of insurance (FT1), bridge rectifier ( D1-D4), filtering and stabilizing capacitors (C1-C5), inductors (L1-L2), diodes (D5) and integrated voltage stabilizing block (U1) are connected; ), an optocoupler detection control device (U2), a Zener diode (D6) and a resistor (R1-R3) are connected; Body (LED1-LED7) and Zener tube (D11-D17) connected to form. 2. The constant current LED lighting lamp according to claim 1, characterized in that the illuminance changeover switch (SW1) is a six-position rotary switch. the

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