CN2745310Y

CN2745310Y - Electroluminescent device driver

Info

Publication number: CN2745310Y
Application number: CN200420076638.5U
Authority: CN
Inventors: 涂深俊; 邵忠文
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-16
Filing date: 2004-09-16
Publication date: 2005-12-07
Anticipated expiration: 2014-09-16

Abstract

The utility model relates to an electroluminescent device driver, comprising a rectifying filter and a transformer output loop. The electroluminescent device driver is characterized in that a duotriode closed loop oscillating circuit and a starting oscillation protective circuit are arranged between a rectifying filter circuit and the transformer output loop. The duotriode closed loop oscillating circuit comprises two triodes that are connected in series, the B pole and the E pole of the two triodes are respectively provided with feedback windings; the starting oscillation protective circuit comprises two capacitors C1 and C3 that are connected in series, the C3 is connected in parallel with a circuit that comprises a resistor R3, a capacitor C5, a resistor R6 and a capacitor C6. The electroluminescent device driver of the utility model provides more than 400Hz-3KHz 120V alternating current power supplies for an electroluminescent device, and has reliable performance, long lifespan and excellent short-circuit protection function. The electroluminescent device driver is mainly used for driving the electroluminescent device.

Description

The electroluminescent device driver

(1) technical field: the utility model relates to electrical installation, is a kind of driver that is used for the Driving Field electroluminescence device.

(2) background technology: electroluminescent device is to utilize the electroluminescent principle, needs the above AC field of 400HZ-3KHZ120V to drive a kind of luminescent device that just can send best visible light, is a kind of capacitive load.At present, the electroluminescent device driver has dual mode: 1. low-voltage direct input: the input direct current is through single triode, and inverter voltage is exported in transformer self-oscillation.This drive circuit is worked under the civil power communication environment, and front end need provide DC power supply, and the price height connects complicated (branch that is connected with positive and negative electrode of direct current and inverter circuit thereafter).2. civil power exchanges input: the input AC civil power, design rectification circuit in the driver, and civil power is transformed to dc low-voltage, the circuit of the back then circuit structure with aforementioned manner 1 is identical, has identical shortcoming.

(3) summary of the invention: the purpose of this utility model is to overcome problems of the prior art, provides a kind of dependable performance, life-span long, and has the electroluminescent device driver of short-circuit protection function.

Concrete scheme of the present utility model is: design has current rectifying and wave filtering circuit and transformer circuit, particularly: between current rectifying and wave filtering circuit and transformer output loop, be provided with double-triode valve closed-loop oscillating circuit and starting of oscillation protective circuit, wherein: the described double-triode valve closed-loop oscillating circuit of a. includes the triode of two series connection, the E utmost point of the C level of first triode and second triode wherein, be connected with current rectifying and wave filtering circuit, the E utmost point of first triode then is connected with the transformer output loop with the C utmost point of second triode, between the B of two triodes utmost point and the E utmost point feedback winding is housed respectively; B. described starting of oscillation protective circuit; include the capacitor C 1 and the C3 of two series connection; its two outer end connects current rectifying and wave filtering circuit; be parallel with the circuit that is composed in series by resistance R 3, capacitor C 5, resistance R 6, capacitor C 6 with C3; connect the transformer output loop from the front end lead-in wire of resistance R 3; is connected the B utmost point of aforementioned one of them triode from lead-in wire between capacitor C 5 and the resistance R 6, afterwards adorns commutating pole pipe D6 from lead-in wire between resistance R 6 and the capacitor C 6 and be connected the transformer output loop.

The utility model provides AC power more than the 400HZ-3KHZ120V for electroluminescent device, dependable performance, and the life-span is long, has good short-circuit protection function.

(4) description of drawings:

Fig. 1 is this driver circuit structure block diagram;

Fig. 2 is the starting of oscillation protective circuit schematic diagram in this driver.

Among the figure: the 1-current rectifying and wave filtering circuit, 2-starting of oscillation protective circuit, 3-feeds back winding, and 4-feeds back winding, and 5, the 6-triode, 7-double-triode valve closed-loop oscillating circuit, 8-transformer output loop.

(5) embodiment:

Referring to Fig. 1, the utility model includes current rectifying and wave filtering circuit 1 and transformer output loop 8 (adopting the prior art scheme to get final product), and particularly between is provided with double-triode valve closed-loop oscillating circuit 7 and starting of oscillation protective circuit 2.Described double-triode valve closed-loop oscillating circuit 7 includes the triode 5,6 of two series connection, and wherein the E utmost point of the C utmost point of triode 5 and triode 6 is connected with current rectifying and wave filtering circuit; The E utmost point of triode 5 then is connected with the transformer output loop with the C utmost point of triode 6; Feedback winding 3 and 4 respectively is housed between the B utmost point of two triodes 5,6 and the E utmost point; described starting of oscillation protective circuit 2 is referring to Fig. 2; include capacitor C 1, the C3 of two series connection; its two outer end connects current rectifying and wave filtering circuit; be parallel with the circuit that is composed in series by resistance R 3, capacitor C 5, resistance R 6, capacitor C 6 with C3; connect the transformer output loop from the front end lead-in wire of resistance R 3; is connected the B utmost point of aforementioned one or two triode from lead-in wire between capacitor C 5 and the resistance R 6, afterwards adorns commutating pole pipe D6 from lead-in wire between resistance R 6 and the capacitor C 6 and be connected the transformer output loop.

Operation principle of the present utility model is summarized as follows:

Civil power for circuit provides high voltage direct current, approximately is 1.4 times of line voltage through rectifying and wave-filtering; Starting of oscillation protective circuit schematic diagram as shown in Figure 2, form by C1, C3, R3, C5, R6, D6, C6, provide charging current at powered on moment C1, C3 for the charge circuit that R3, C5 form, thereby for closed-loop oscillating circuit provides bias current, under the positive feedback effect of transformer feedback winding 4, corresponding triode 6 conductings, and this moment, transformer feedback winding 3 was anti-phase, corresponding triode 5 ends; Because the magnetic saturation effect of transformer, 4 outputs of transformer feedback winding are anti-phase, corresponding triode 6 ends, transformer feedback winding 3 positives feedback, corresponding triode 5 conductings, so repeatedly, the double-triode valve alternate conduction, circuit starting of oscillation, its frequency of oscillation are mainly by transformer output winding electric sensibility reciprocal, load and closed loop circuit decision; After R3 is saturated to the C5 charging, the existing output of transformer, by a winding of transformer through rectifying tube D6 rectification, the C6 voltage stabilizing, the R6 current limliting self provides closed loop vibration bias current, and vibration continues to keep down, the above stable alternating voltage of transformer output loop output 400HZ-3KHZ120V, the Driving Field electroluminescence device sends visible light.Under the situation of output short-circuit, double-triode valve all ends, and transformer is output not, the R6 no current, and bias current disappears, and whole driver is in guard mode.

Claims

1. electroluminescent device driver, include current rectifying and wave filtering circuit and transformer output loop, it is characterized in that: between current rectifying and wave filtering circuit and transformer output loop, be provided with double-triode valve closed-loop oscillating circuit and starting of oscillation protective circuit, wherein: the described double-triode valve closed-loop oscillating circuit of a. includes the triode of two series connection, the E utmost point of the C level of first triode and second triode wherein, be connected with current rectifying and wave filtering circuit, the E utmost point of first triode then is connected with the transformer output loop with the C utmost point of second triode, between the B of two triodes utmost point and the E utmost point feedback winding is housed respectively; B. described starting of oscillation protective circuit; include the capacitor C 1 and the C3 of two series connection; its two outer end connects current rectifying and wave filtering circuit; be parallel with the circuit that is composed in series by resistance R 3, capacitor C 5, resistance R 6, capacitor C 6 with C3; connect the transformer output loop from the front end lead-in wire of resistance R 3; is connected the B utmost point of aforementioned one of them triode from lead-in wire between capacitor C 5 and the resistance R 6, afterwards adorns commutating pole pipe D6 from lead-in wire between resistance R 6 and the capacitor C 6 and be connected the transformer output loop.