CN2455037Y - Flash-free eye-protective lamp for reading - Google Patents

Abstract

A flicker-free reading eye protection lamp, under the action of the voltage stabilizing, rectifying and filtering control circuit, the lamp converts the AC mains power into a stable DC 220V to supply power for incandescent bulbs, and achieves no flickering under poor power grid conditions Phenomenon, the filament of the incandescent bulb emits light evenly, completely eliminates the stroboscopic phenomenon of the incandescent bulb which is harmful to the human body, and can be widely used in the field of daily lighting.

Description

No stroboscopic is read eye-protective lamp

The utility model relates to a kind of lighting, particularly a kind of thermal light source desk lamp.

Existing thermal light source desk lamp all uses the sinusoidal wave industrial AC power of 220V 50HZ directly to power, and thermal light source is the ordinary incandescent lamp bubble.Because power supply network voltage fluctuation, wave distortion and 100 situations such as zero passage of industrial AC power per second that various random causes such as industrial electric interference, high-power household electrical appliance automatic start-stop cause have caused the luminous stroboscopic phenomenon of incandescent lamp bulb, this phenomenon is particularly serious when peak of power consumption and electricity shortage.All people who under the serious desk lamp of stroboscopic, works, learns for a long time, spirit is easily tired, the vision fatiguability, health is easily impaired.

The purpose of this utility model provide a kind of under relatively poor electrical network condition no any scintillation, the novel reading lamp of incandescent lamp bulb filament uniformly light-emitting.

The utility model comprises lamp housing, lampshade, incandescent lamp bulb L, switch SW, is characterized in: also comprise power-supplying circuit; This circuit is made of voltage stabilizing, rectification, filter circuit, an input of power-supplying circuit connects the phase line of single phase alternating current (A.C.) civil power through switch SW, another input connects the zero line of single phase alternating current (A.C.) civil power, and two terminals of two outputs and incandescent lamp bulb L are connected in parallel.

Described voltage stabilizing, rectification, filter circuit are made of compensation transformer T1, full-wave rectification bridge D1～D4, electrolytic capacitor C1, C2; The input of compensation transformer T1 connects the phase line of single phase alternating current (A.C.) civil power through switch SW, another input connects the zero line of single phase alternating current (A.C.) civil power, two outputs of compensation transformer T1 are connected with two inputs of full-wave rectification bridge D1～D4, two outputs of full-wave rectification bridge D1～D4 and two terminals of incandescent lamp bulb L are connected in parallel, after electrolytic capacitor C1, the C2 parallel connection, its positive pole is connected with the output (negative pole) of full-wave rectification bridge D1～D4, and its negative pole is connected with the output (positive pole) of full-wave rectification bridge D1～D4.

Described compensation transformer T1 is made of primary coil L1, secondary coil L2, silicon sheet core; Primary coil L1, secondary coil L2 are co-located on the silicon sheet core, primary coil L1, secondary coil L2 respectively get an end respectively as input, the remaining two ends of two coils link together, constitute the output of compensation transformer T1, another output is made of the input of primary coil L1; Can also primary coil L1, secondary coil L2 respectively get an end respectively as output, the remaining two ends of two coils link together, and constitute the input of compensation transformer T1, and another input is made of the output of primary coil L1.

During use, connect switch SW, the 220V electric main is added on the compensation transformer T1 input.Owing to adopt compensation step-down mode, guaranteed that the two ends of incandescent lamp bulb L obtain the 220V direct voltage, make the light bulb filament caloric value identical with 220V AC value power supplying and heating amount, guarantee the design power of bulb; Compensation transformer T1 can be considered an equivalent inductance string at input, because flowing through the electric current of inductance can not suddenly change, when switch SW is closed, input current can only progressively increase by zero with the regular hour constant, with limiting capacitance device charging current, reduce the impact of capacitor charging, and prolong capacitor charge time AC power and rectifier diode.During each energized, because the voltage at capacitor two ends can not suddenly change, the voltage at capacitor two ends begins to increase by zero, and light bulb filament voltage raises with condenser voltage and increases, thereby the excessive problem of impulse current when reducing the light bulb filament cold conditions and powering up has suddenly prolonged useful life of bulb.

The utility model is under the effect of power-supplying circuit, it is the incandescent lamp bulb power supply that electric main is converted to steady direct current 220V, accomplished no any scintillation under relatively poor electrical network condition, incandescent lamp bulb filament uniformly light-emitting has thoroughly been eliminated the luminous stroboscopic phenomenon of harmful incandescent lamp bulb.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described:

Accompanying drawing 1 is the electrical schematic diagram of the utility model embodiment

With reference to the accompanying drawings 1, the utility model comprises lamp housing, lampshade, incandescent lamp bulb L, switch SW, is characterized in: also comprise power-supplying circuit; This circuit is made of voltage stabilizing, rectification, filter circuit, an input of power-supplying circuit connects the phase line of single phase alternating current (A.C.) civil power through switch SW, another input connects the zero line of single phase alternating current (A.C.) civil power, and two terminals of two outputs and incandescent lamp bulb L are connected in parallel.

Described voltage stabilizing, rectification, filter circuit are made of compensation transformer T1, full-wave rectification bridge D1～D4, electrolytic capacitor C1, C2; The input of compensation transformer T1 connects the phase line of single phase alternating current (A.C.) civil power through switch SW, another input connects the zero line of single phase alternating current (A.C.) civil power, two outputs of compensation transformer T1 are connected with two inputs of full-wave rectification bridge D1～D4, two outputs of full-wave rectification bridge D1～D4 and two terminals of incandescent lamp bulb L are connected in parallel, after electrolytic capacitor C1, the C2 parallel connection, its positive pole is connected with the output (negative pole) of full-wave rectification bridge D1～D4, and its negative pole is connected with the output (positive pole) of full-wave rectification bridge D1～D4.

Described compensation transformer T1 is made of primary coil L1, secondary coil L2, silicon sheet core; Primary coil L1, secondary coil L2 are co-located on the silicon sheet core, primary coil L1, secondary coil L2 respectively get an end respectively as input, the remaining two ends of two coils link together, constitute the output of compensation transformer T1, another output is made of the input of primary coil L1; Can also primary coil L1, secondary coil L2 respectively get an end respectively as output, the remaining two ends of two coils link together, and constitute the input of compensation transformer T1, and another input is made of the output of primary coil L1.

During use, connect switch SW, the 220V electric main is added on the compensation transformer T1 input.Owing to adopt compensation step-down mode, guaranteed that the two ends of incandescent lamp bulb L obtain the 220V direct voltage, make the light bulb filament caloric value identical with 220V AC value power supplying and heating amount, guarantee the design power of bulb; Compensation transformer T1 can be considered an equivalent inductance string at input, because flowing through the electric current of inductance can not suddenly change, when switch SW is closed, input current can only progressively increase by zero with the regular hour constant, with limiting capacitance device charging current, reduce the impact of capacitor charging, and prolong capacitor charge time AC power and rectifier diode.During each energized, because the voltage at capacitor two ends can not suddenly change, the voltage at capacitor two ends begins to increase by zero, and light bulb filament voltage raises with condenser voltage and increases, thereby the excessive problem of impulse current when reducing the light bulb filament cold conditions and powering up has suddenly prolonged useful life of bulb.

In embodiment of the present utility model, the primary coil L1 of compensation transformer presses the setting of 220V voltage, and secondary coil L2 presses the setting of 40V voltage; Rectifier diode D1～D4 model is IN4007; Electrolytic capacitor C1, C2 are 400V 47 μ f.

Claims (4)

1. A flicker-free reading eye protection lamp, including a lamp housing, a lampshade, an incandescent bulb (L), and a switch (SW), is characterized in that: it also includes a power supply control circuit; One input of the control circuit is connected to the phase line of the single-phase AC mains through a switch (SW), the other input is connected to the neutral line of the single-phase AC mains, and the two output terminals are connected in parallel with the two terminals of the incandescent bulb (L) connect. 2. The flicker-free reading eye protection lamp according to claim 1, characterized in that: the voltage stabilizing, rectifying and filtering circuits are composed of a compensation transformer (T1), a full-wave rectifier bridge (D1～D4), an electrolytic capacitor ( C1, C2) composition; one input end of the compensation transformer (T1) is connected to the phase line of the single-phase AC mains through a switch (SW), and the other input end is connected to the neutral line of the single-phase AC mains, and the compensation transformer (T1 ) are connected to the two input terminals of the full-wave rectifier bridge (D1-D4), and the two output terminals of the full-wave rectifier bridge (D1-D4) are connected in parallel with the two terminals of the incandescent bulb (L), After the electrolytic capacitors (C1, C2) are connected in parallel, their positive poles are connected to the output terminals (negative poles) of the full-wave rectifier bridges (D1-D4), and their negative poles are connected to the output terminals (positive poles) of the full-wave rectifier bridges (D1-D4). 3. The flicker-free reading eye protection lamp according to claim 1, characterized in that: the compensation transformer (T1) is composed of a primary coil (L1), a secondary coil (L2), and a silicon steel sheet core; the primary coil (L1) and the secondary coil (L2) are jointly arranged on the silicon steel sheet iron core, each of the primary coil (L1) and the secondary coil (L2) takes one end as the input end, and the remaining two ends of the two coils are connected together to form a One output end of the compensation transformer (T1) and the other output end are formed by the input end of the primary coil (L1). 4. The flicker-free reading eye protection lamp according to claim 1, characterized in that: the compensation transformer (T1) is composed of a primary coil (L1), a secondary coil (L2), and a silicon steel sheet core; the primary coil (L1) and the secondary coil (L2) are jointly arranged on the silicon steel sheet iron core, each of the primary coil (L1) and the secondary coil (L2) takes one end as the output end, and the remaining two ends of the two coils are connected together to form a One input end of the compensation transformer (T1) and the other input end are formed by the output end of the primary coil (L1).

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