CN2135898Y - Current changing fluorescent lamp ballast - Google Patents

Abstract

A fluorescent lamp ballast converts AC power into DC power to start and emit light. In the circuit, the input end of a rectifying and filtering circuit is electrically connected with the input end of a boosting and rectifying circuit through a series current limiter, the output end of the rectifying and filtering circuit is electrically connected with the output end of the boosting and rectifying circuit through a diode, and one output end of the boosting and rectifying circuit is electrically connected with the output end of a ballast through a buffer. The ballast has the advantages of strong reliability, lower cost, electricity saving, good starting performance, long service life of the fluorescent lamp, high lighting effect and good light quality.

Description

Ac fluorescent ballast

The utility model is a kind of fluorescent lamp ballast.

The fluorescent lamp ballast of extensive use at present is inductance type and frequency-variable electronic formula, frequency conversion type than inductance type economize on electricity, light efficiency height are arranged, advantage such as light quality is good, starting performance is good, but the frequency conversion type ballast exists shortcomings such as failure rate height, the high frequency width of cloth are penetrated, price height.

The purpose of this utility model provides that a kind of failure rate is low, economize on electricity, starting performance are good, make the fluorescent lamp ballast that fluorescent lifetime is long, light efficiency is high, light quality is good.

The purpose of this utility model is achieved in that in the circuit, one input of current rectifying and wave filtering circuit is electrically connected with the power end of boost rectifying circuit, the other end of current rectifying and wave filtering circuit is electrically connected with another power end of boost rectifying circuit by flow restricter, the boost rectifying circuit output is connected by diode electrically with the output of current rectifying and wave filtering circuit, one output of boost rectifying circuit is electrically connected with an end of buffer, the other end of buffer is an output of ballast, and another output of boost rectifying circuit is another output of ballast.When two output lines of ballast be connected with two electrode leads to client of fluorescent lamp respectively and energized after, boost rectifying circuit with big internal resistance is exported higher direct voltage rapidly, this voltage makes fluorescent lamp produce gas discharge via buffer, the interior resistance that is directed at fluorescent lamp descends, the voltage at fluorescent lamp two ends descends thereupon, when this voltage is lower than the crest voltage of power supply, be connected two diode current flows on the rectification filter circuit output end, the electric current that flows through fluorescent lamp continues to increase, the increase of buffer limit electric current with reduce speed, when the electric current of stream fluorescent lamp reached certain value, it continued flow restrictors limit to change.

Adopt such scheme, the components and parts of use are less, and the quality of each components and parts, parameter reach higher requirement easily, so simple in structure, good reliability, cost is lower.Boost rectifying circuit can produce starting voltage rapidly, makes the fluorescent lamp fast starting.Because the effect of buffer, the climbing of starter electric current is little, and the Alternating Component of glow current is little, and the rush of current that fluorescent lamp is subjected to when starter is little, the peak factor of glow current is low, so the starter of fluorescent lamp and luminescent lifetime are long, luminous efficiency is high, light quality is good.Because the electrical loss of each components and parts is less, the fluorescent lamp light efficiency improves, so power savings is arranged.

Below in conjunction with accompanying drawing and enforcement the utility model is further specified.

Fig. 1 is the circuit theory diagrams of first embodiment of the present utility model.

Fig. 2 is the circuit theory diagrams of second embodiment of the present utility model.

Among the figure: 1, boost rectifying circuit 2, current rectifying and wave filtering circuit 3, buffer 4, flow restricter 5, isolating diode 6, isolating diode 7, polarity switch 8, compensating inductance

In Fig. 1, one input of current rectifying and wave filtering circuit (2) is electrically connected with a power end of boost rectifying circuit (1), another input of current rectifying and wave filtering circuit (2) is electrically connected with another power end of boost rectifying circuit (1) by flow restricter (4), the output of boost rectifying circuit (1) is by isolating diode (5), (6) output with current rectifying and wave filtering circuit (2) is electrically connected, one output of boost rectifying circuit (1) is electrically connected with an output of ballast by buffer (3), and another output of boost rectifying circuit (1) is another output of ballast.

Boost rectifying circuit (1) need have bigger internal resistance, and it can be made of the voltage doubling rectifing circuit that diode, electric capacity are formed.Current rectifying and wave filtering circuit (2) can be connected into by diode or single-phase bridge rectifier and electric capacity.Buffer (3) can be made of active filter circuit or inductor, also can be made of resistance.Flow restricter (4) can be made of electric capacity or inductance.The output of current rectifying and wave filtering circuit (2) can be electrically connected resistance, to prevent the human electric shock.

Fig. 2 circuit is electrically connected in series the compensating inductance (8) that improves power factor in power line on the basis of Fig. 1; In two output lines, be electrically connected in series polarity switch (7), in order to make it luminous not foot phenomenon of end does not appear for conventional fluorescent lamps, polarity switch can be made of the time relay with two groups of transfer contacts, and its power supply can be supplied with by current rectifying and wave filtering circuit, also can use AC power; All obtain utilizing the useful life for two electrodes making fluorescent tube for high power or compact fluorescent lamp, polarity switch can be made of the hand switch with two groups of transfer contacts.

Claims (4)

1, a kind of fluorescent lamp ballast, in the circuit, a boost rectifying circuit is arranged 1., current rectifying and wave filtering circuit 2., buffer 3., flow restricter 4., it is characterized in that: a current rectifying and wave filtering circuit input 2. is electrically connected with a boost rectifying circuit power end 1., 4. the current rectifying and wave filtering circuit other end 2. is electrically connected with boost rectifying circuit another power end 1. by flow restricter, boost rectifying circuit output 1. by isolating diode 5., 6. be electrically connected with current rectifying and wave filtering circuit output 2., 4. a boost rectifying circuit output 1. is electrically connected with an output of ballast by buffer.

2, fluorescent lamp ballast according to claim 1 is characterized in that: can be electrically connected in series compensating inductance 8. in the power line.

3, fluorescent lamp ballast according to claim 1, it is characterized in that: can be electrically connected in series polarity switch 7. in the output line, it can be made of hand switch, and also the up duration relay constitutes, the power supply of the time relay by current rectifying and wave filtering circuit 2. or AC power supply with.

4, fluorescent lamp ballast according to claim 1 is characterized in that: 3. buffer can be made of active filter circuit, and 3. buffer also can be made of inductance or resistance.