CN2452244Y

CN2452244Y - Electronic ballast

Info

Publication number: CN2452244Y
Application number: CN 00261282
Authority: CN
Inventors: 金水锦; 屠世明
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-01
Filing date: 2000-11-01
Publication date: 2001-10-03
Anticipated expiration: 2010-11-01

Abstract

The utility model relates to an electronic ballast for the illumination of high-voltage mercury and sodium lamps in squares, roads and fields. The electronic ballast is composed of a rectification circuit, a main circuit and a protection circuit. A zero voltage switching circuit is designed in the main circuit for enhancing power and decreasing power consumption. The electronic ballast overcomes the defect that Inductance type ballasts have large power consumption. The protection circuit protects the service life of lamp bulbs and MOS field-effect tubes. The maintenance cost is decreased.

Description

A kind of electric ballast

The utility model relates to the electronic ballast technical field, specifically is a kind of electric ballast.

Existing square, the high-pressure mercury of the open-air illumination of road, the inductance type ballast of sodium vapor lamp of being used for adopts the pure inductance ballast technology, and the greatest drawback of existence is that starting current is big, and power factor (PF) is low, the power consumption height; Volume is big, Heavy Weight.

The utility model provides a kind of electric ballast, solves the defective that inductance type ballast exists, so that reduce the electrisity consumption of ballast itself.

The technical conceive scheme of the utility model record is as follows: this electric ballast is made up of rectification circuit, main circuit, protective circuit and shell; Rectification circuit includes bridge heap rectifying tube, dielectric capacitance and output resistance; Main circuit includes oscillating circuit, excitation output circuit and zero voltage switch circuit; Oscillating circuit mainly is made up of input oscillator coil and output oscillator coil, and the excitation output circuit mainly is made up of metal-oxide-semiconductor field effect transistor; The zero voltage switch circuit mainly is made up of metal-oxide-semiconductor field effect transistor and electric capacity.Protective circuit includes delay protection circuit and abnormity protection circuit.The delay protection circuit mainly is made up of triode and Resistor-Capacitor Unit, and abnormity protection circuit is mainly by triode, and diode and electric capacity are formed.Rectification circuit output end connects the input of main circuit.Oscillating circuit input oscillator coil connects the input of excitation output circuit; the output of excitation output circuit connects oscillating circuit output oscillator coil; excite and light lighting bulb; the metal-oxide-semiconductor field effect transistor shunt capacitance of exciting circuit is formed the zero voltage switch circuit; delay circuit is made up of output resistance and triode etc.; its output is succeeded the electric current coil; abnormity protection circuit is mainly by electric capacity; diode and triode are formed; input end capacitor connects the S utmost point of exciting circuit metal-oxide-semiconductor field effect transistor, and output connects the relay power coil.

Design the zero voltage switch circuit in the main circuit of the present utility model, can reduce the power loss of main circuit self, overcome the big disadvantage of primary inductance type ballast power loss, according to testing result, power saving 35%.Abnormity protection circuit in the circuit is for excitation output circuit overrate electric current; during voltage, can in time disconnect the relay current coil, cut off the electricity supply; reach the damage of the metal-oxide-semiconductor field effect transistor in the protection main circuit and the damage of circuit load lighting bulb, increase the service life.

Below, reach embodiment with reference to the accompanying drawings, technology contents of the present utility model is described in detail in detail.

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

Fig. 2 is a topology view of the present utility model.

The output of rectification circuit of the present utility model connects current coil P5,6 energisings of relay 7, when relay is inhaled lock, and B and C, b and c joint are connected, and connect the output controllable silicon Q of main circuit ₃(0405), the input self-oscillation coil T by oscillating circuit ₅And T ₆Produce the high-frequency signal of 30KHZ, be input to the metal-oxide-semiconductor field effect transistor Q of excitation output circuit ₁And Q ₂The G utmost point, metal-oxide-semiconductor field effect transistor Q ₁, Q ₂Be in series Q ₁The S utmost point just meet Q ₂D utmost point ground connection.Q ₂The S utmost point by oscillating circuit self-oscillation coil T ₃Output 4500V high voltage is lighted bulb, the metal-oxide-semiconductor field effect transistor Q of exciting circuit ₁And Q ₂Difference electrodeless electric capacity C in parallel ₈And C ₇, Q ₂And C ₈Compose in parallel the zero voltage switch circuit, make from trigger tube F ₁, to Q ₂G utmost point part electric current come out to pass through capacitor C by the D utmost point ₈Return Q ₂The S utmost point, reduce power loss.Metal-oxide-semiconductor field effect transistor Q ₁S pole tension 120V, by rectification circuit output resistance R ₁End is supplied with.The delay protection circuit is mainly by triode Q ₄-Q ₇(2N5551,9014, ZN5401), diode D ₅-D ₁₁(5399) and Resistor-Capacitor Unit form, the voltage of rectification circuit output is through protective circuit input resistance R ₈Obtain the 12V magnitude of voltage, supply with triode Q ₄Operating voltage is through Q ₅, Q ₆At last by Q ₇The certain voltage of getting is to dielectric capacitance E ₃Charging makes relay (BF) 7 current coil P work when reaching 12V, 5,6 connect, and the same B of contact C, c connect with b, light bulb by main circuit, electric capacity E ₃The time of charging time-delay, can give the preheating of load bulb, eliminate heavy current impact, the useful life of protection bulb.Triode Q in the circuit ₄, Q ₅, Q ₆Emitter serial connection diode D ₅, D ₆And D ₇As input resistance R ₈When big electric current occurring, play shunting triode Q ₄, Q ₅, Q ₆The part electric current, protection triode Q ₄, Q ₅, Q ₆Metal-oxide-semiconductor field effect transistor Q ₂The D utmost point and Q ₁Serial connection diode D between the S utmost point ₁₄, D ₁₅, D ₁₆(4007), dividing potential drop field effect transistor Q ₂G utmost point too high voltages output, protection metal-oxide-semiconductor field effect transistor Q ₁, Q ₂Abnormity protection circuit occurs as T at circuit ₃, T ₅, T ₆Fault is arranged, rectification circuit or MSO field effect transistor Q ₂When big electric current or high voltage occurring, pass through C ₄, D ₉, Q ₆, make Q ₆, Q ₇End, quit work, 56 disconnections together of relay 7 current coil P make relay 7 release lock.C and B, c and b disconnect and release lock, avoid the damage of metal-oxide-semiconductor field effect transistor and bulb.

Delay protection circuit of the present utility model and oscillating circuit be installed in respectively on the delay protection circuit board 9 that joins with shell 8 and oscillator circuit plate 10 on; in the relay 7 attaching shells 8; the capacitance resistance component of other circuit and self-oscillation coil are installed on the main circuit board 11, and the input 1,2 of rectification circuit connects power supply output 3,4 of the present utility model and connects the load lighting bulb.

Claims

1, a kind of electric ballast, it is by rectification circuit, and main-circuit protection circuit and shell are formed, and rectification circuit output end connects the controlled brick Q of input of main circuit ₃, the S utmost point output of excitation output circuit metal-oxide-semiconductor field effect transistor connects oscillating circuit output oscillator coil T ₃, oscillator coil T ₃Connect the load bulb, it is characterized in that:

A, excitation output circuit metal-oxide-semiconductor field effect transistor Q ₂, Q ₃Serial connection,

B, metal-oxide-semiconductor field effect transistor Q ₂Be parallel with capacitor C ₈

2, a kind of electric ballast according to claim 1 is characterized in that the delay protection circuit has output resistance R ₈, triode Q ₄, Q ₅, Q ₆, Q ₇And diode D ₅-D ₁Form output relay termination (7) current coil P.

3, a kind of electronics according to claim 1 town device is characterized in that abnormity protection circuit is by capacitor C ₄Diode D ₉And triode Q ₆And Q ₇Form input end capacitor C ₄Connect the S utmost point that encourages the output circuit metal-oxide-semiconductor field effect transistor, output triode Q ₇The E utmost point connect relay (7) current coil P.