CN204350426U

CN204350426U - Ballast

Info

Publication number: CN204350426U
Application number: CN201420775566.7U
Authority: CN
Inventors: 郑水花; 徐承金
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-09
Filing date: 2014-12-09
Publication date: 2015-05-20
Anticipated expiration: 2024-12-09

Abstract

The utility model discloses a kind of ballast, the AC/DC change-over circuit, filter rectifier, flyback converter, the output that comprise, described ballast also comprises electromagnetic filter circuit, power factor correction circuit and short-circuit protection.The utility model by multiple ballast is connected to same ballast controller, thus realizes multiple ballast controlling functions, and this device can also suppress instantaneous high pressure, effectively suppresses instant pulse current.

Description

Ballast

Technical field

The utility model relates to a kind of ballast, particularly relates to the ballast that a kind of fluorescent lamp uses.

Background technology

In current lighting industry, existing universal electronic ballast is made up of electrotechnical elements such as thermoswitch, thermal resistance coils, this ballast have very strong noise and working temperature high, and there is passage of scintillation light, light fixture can not be lighted fast when the power is turned on, simultaneously because supply power voltage is unstable, ballast and light fixture are all easy to burn out, and cause the loss of user.

At present, ballast is the requisite device of fluorescent lamp.When turning on light, ballast can produce high self induction voltage and supply voltage superposition, makes lamp tube ends obtain higher starting resistor; After starting, it is connected with fluorescent tube as a retardation coil, makes the voltage of lamp tube ends be reduced to rated value.Circular ring type pipe fluorescent lamp is generally spliced by several sections of fluorescent tubes, and existing single ballast is difficult to realize the conversion between multiple fluorescent tube and control.

Therefore, need a kind of new ballast of invention to solve the problem.

Summary of the invention

The purpose of this utility model is to provide the control that a kind of structure is simple, can realize multiple fluorescent tube, the ballast of multi-load output.

The utility model, in order to realize above-mentioned technical purpose, adopts following technical scheme:

A kind of ballast, comprise the AC/DC change-over circuit of order electrical connection, filter rectifier, flyback converter, output, it is characterized in that, described ballast also comprises suppressing high-frequency current harmonic wave electrical network to be produced to the electromagnetic filter circuit polluted, in order to improve power factor, reduce harmonic wave, realize the power factor correction circuit of constant power output, short-circuit protection, described electromagnetic filter circuit is connected between voltage input end and AC/DC change-over circuit, described power factor correction circuit is connected between AC/DC change-over circuit and filter rectifier, described short-circuit protection circuit is arranged among flyback converter.

Also overvoltage crowbar is comprised in described electromagnetic filter circuit.

Described short-circuit protection circuit also comprises current foldback circuit, and described current foldback circuit is series limiting resistor in input circuit.

Described short-circuit protection circuit also comprises current foldback circuit, and described current foldback circuit is thermal resistance of connecting in input circuit.

Also comprise startup preheat circuit in described output, described startup preheat circuit is heated to a brightness temperature by the filament of thermal resistance to fluorescent lamp.

Multi-load operating circuit is also comprised in described output.

Described short-circuit protection circuit utilizes transistor to the circuit of the size thus the work of control inverter circuit that detect electric current.

Optionally, what described multi-load operating circuit adopted is many lamps series circuit.

The ballast design scheme that the utility model provides, by two or more ballasts being placed in same ballast module, and the ballast control circuit be attached thereto controls, thus realize the function of the startup of two or more ballasts, closedown and cross exchanged.A kind of circular ring type pipe electron section ballast like this, is easy to conversion and control between multiple fluorescent tube, simple to operate, safety.

Accompanying drawing explanation

Fig. 1 is the line principle schematic diagram of prior art;

The line principle schematic diagram that Fig. 2 adopts for the utility model;

Fig. 3 is electromagnetic filter circuit working process schematic of the present utility model;

Fig. 4 is APFC schematic diagram of the present utility model;

Fig. 5 is the circuit of power factor correction schematic diagram of prior art;

Fig. 6 is short-circuit protection circuit schematic diagram of the present utility model;

Fig. 7 is overvoltage crowbar schematic diagram of the present utility model;

Fig. 8 is current foldback circuit schematic diagram of the present utility model;

Fig. 9 is one of startup preheat circuit scheme of the present utility model schematic diagram;

Figure 10 is two schematic diagrames of startup preheat circuit scheme of the present utility model;

Figure 11 is three schematic diagrames of startup preheat circuit scheme of the present utility model;

Figure 12 is one of multi-load operating circuit scheme of the present utility model schematic diagram;

Figure 13 is two schematic diagrames of multi-load operating circuit scheme of the present utility model;

Embodiment

For understanding the utility model better, set forth below by embodiment.

With reference to figure 2, illustrate a kind of ballast that the utility model provides, comprise order electricity

The AC/DC change-over circuit connected, filter rectifier, flyback converter, output, described ballast also comprises suppressing high-frequency current harmonic wave electrical network to be produced to the electromagnetic filter circuit polluted, in order to improve power factor, reduce harmonic wave, realize the power factor correction circuit of constant power output, short-circuit protection, described electromagnetic filter circuit is connected between voltage input end and AC/DC change-over circuit, described power factor correction circuit is connected between AC/DC change-over circuit and filter rectifier, described short-circuit protection circuit is arranged among flyback converter.

With reference to figure 3, illustrate the electromagnetic filter circuit that the utility model provides, be made up of inductance and electric capacity.

With reference to figure 4, illustrate the APFC that the utility model provides.This kind of circuit of power factor correction will use special integrated circuit, transistor and some peripheral cells, because relate to active components and parts so be called power factor correction circuit.

With reference to figure 6, illustrate the short-circuit protection circuit that the utility model provides.In normal operation, arranging the voltage that auxiliary winding produces on electric capacity C2 only has 22-27V(or lower), it is not enough to make DB3 conducting.Therefore Q3 Q4 can not get enough base currents and trigger current, and be in cut-off and off state, at this moment abnormal protection circuit is inoperative.And once there is short circuit, the voltage that C2 induces, more than the trigger voltage of DB3, makes DB3 conducting, thus conducting Q3 Q4, flyback converter is quit work, and can not again trigger.

With reference to figure 7, illustrate the overvoltage crowbar that the utility model provides.A Zinc-oxide piezoresistor in parallel in its input circuit, it can, by the line voltage momentary spike pulsecutting that occurs in input circuit or amplitude limit, make the voltage being added to ballast reduce.

With reference to figure 8; illustrate the current foldback circuit that the utility model provides; reducing the best approach of surge current is exactly the resistance of a current-limiting resistance or negative temperature coefficient of connecting in input circuit, and negative temperature coefficient resister cold resistance is at ambient temperature comparatively large, can surge current suppression effectively.

With reference to any width in figure 9, Figure 10, Figure 11, illustrate the startup preheat circuit that the utility model provides, first should ensure to make negative electrode to reach temperature required for transmitting, namely negative electrode (i.e. filament) is supplied to enough electric currents and certain warm-up time, reach electron emission state at negative electrode, and form enough electronic fogs around negative electrode before, the voltage being added to lamp tube ends should be enough low, in order to avoid there is glow discharge, negative electrode is caused to sustain damage.

With reference to any width in Figure 12, Figure 13, illustrate the multi-load operating circuit that the utility model provides, so-called multi-load working line is exactly the fluorescent tube that a ballast controls more than two or two.This circuit has easy for installation, and unfailing performance is high, advantage that energy-saving effect is remarkable etc., electronic circuit many fluorescent tubes series circuit that the utility model adopts.

Above disclosedly be only preferred embodiment of the present utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.

Claims

1. a ballast; it is characterized in that; comprise the AC/DC change-over circuit of order electrical connection, filter rectifier, flyback converter, output, electromagnetic filter circuit, power factor correction circuit and short-circuit protection; described electromagnetic filter circuit is connected between voltage input end and AC/DC change-over circuit; described power factor correction circuit is connected between AC/DC change-over circuit and filter rectifier, and described short-circuit protection circuit is arranged among flyback converter.

2. ballast as claimed in claim 1, is characterized in that, also comprise overvoltage crowbar in described electromagnetic filter circuit.

3. ballast as claimed in claim 1, it is characterized in that, described short-circuit protection circuit is also included in series limiting resistor current foldback circuit in input circuit.

4. ballast as claimed in claim 1, it is characterized in that, also comprise startup preheat circuit in described output, described startup preheat circuit is heated by the filament of thermal resistance to fluorescent lamp.

5. ballast as claimed in claim 1, is characterized in that, also comprise multi-load operating circuit in described output.

6. ballast as claimed in claim 1, is characterized in that, described short-circuit protection circuit utilizes transistor to the circuit of the size thus the work of control inverter circuit that detect electric current.

7. ballast as claimed in claim 5, it is characterized in that, described multi-load operating circuit adopts many lamps series circuit.