CN1610477A

CN1610477A - Working circuit for electrode free gas discharge lamp

Info

Publication number: CN1610477A
Application number: CN 200310101187
Authority: CN
Inventors: 任文华
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-10-22
Filing date: 2003-10-22
Publication date: 2005-04-27

Abstract

The work circuit for electrode-less gas discharge lamp consists of mainly filter circuit, bridge rectifier, class-E converter and power factor correcting circuit. The circuit has simple structure and reliable operation, and can provide the lamp load with high frequency electromagnetic field energy in high efficiency.

Description

The operating circuit of electrode-less gas discharge lamp

Technical field

The present invention relates to a kind of operating circuit of electrode-less gas discharge lamp.

Background technology

Electrode-less gas discharge lamp is a kind of high efficiency light source that is driven by high-frequency ac power, and the frequency of its high-frequency ac power is very high, generally should be greater than 50KHZ.But the frequency of the AC power that is provided by Utilities Electric Co. is very low on the line, and its frequency generally is about 50Hz or 60Hz.Therefore, in order to make electrode-less gas discharge lamp energy operate as normal, the AC power of low frequency need be converted to the AC power of high frequency.

AC power becomes another kind of frequency to be realized by rectifier circuit from a kind of frequency inverted.Release first compact electrodeless lamp that is called as " Genura " since General Electric Apparatus Co.(U.S.A.) in 1994, around the development and the requirement of electrode-less gas discharge lamp, the designing technique of its ballast circuit and the requirement of industrialization are also improving constantly.The inventor has proposed " being used for the research of the high-frequency electronic ballast of an electrodeless fluorescent lamp " literary composition on " illuminating engineering journal " (in March, 1999, the 10th volume, first phase .P12), introduced the basic principle of theme circuit.Fig. 1 has provided the schematic diagram of this circuit, and this circuit mainly comprises line filter 1, rectification circuit 2, positive feedback converter 3, DC-AC converter 4 and coupling output circuit 5.Line filter 1 links to each other with the terminal of the line voltage of the low-frequency ac power of 50Hz or 60Hz, is used for the High-frequency Interference that the input noise of filtering line voltage and filtering positive feedback converter 3 and DC-AC converter 4 high-frequency operations are produced; Low-frequency ac produces the direct current of pulsation through bridge rectifier 2 rectifications; Positive feedback converter 3 is active circuit of power factor correction, and the direct voltage of pulsation is through the conversion of positive feedback converter 3, has improved the power factor of circuit and presses for the DC-AC converter 4 that is connected the back provides galvanic current; DC-AC converter 4 is the semi-bridge alternation circuit by integrated controll block control, and it becomes high-frequency ac voltage to dc voltage conversion, for lamp load provides the high-frequency electromagnetic field energy.

Circuit shown in Figure 1, its major defect is: to the needs of independent passive power factor corrective converter and independent DC-AC converter are set, increased the volume and the cost of manufacture of entire circuit device; Because the structure of its passive power factor corrective converter and DC-AC converter all is complicated, influence the reliability of its circuit working simultaneously.

Summary of the invention

The objective of the invention is to propose the operating circuit of the electrode-less gas discharge lamp of a kind of low cost, miniaturization.Utilize the setting of the E quasi-converter circuit that simple circuit of power factor correction and feedback signal drive, simplified structure on the whole, reduces cost at reduced volume, improves the reliability of its work simultaneously.

The operating circuit of electrode-less gas discharge lamp provided by the invention mainly comprises:

A line filter is made up of twin coil inductance and the filter capacitor that is connected across its two ends, is used for filtering input noise and high-frequency interferencing signal;

A bridge rectifier is used for the AC power of electrical network input is transformed into DC power supply;

A capacitor, it is coupled to described rectifier, is used for stored energy, as described DC power supply;

A start-up circuit is made up of resistance, electric capacity, diode and trigger tube, is used for producing enabling signal;

An E quasi-converter circuit is made up of transistor, choking-winding, load circuit and control circuit, and this circuit produces high-frequency oscillation signal, for lamp load provides the high-frequency electromagnetic field energy;

A circuit of power factor correction is used for the power factor of correcting circuit;

It is characterized in that:

(1), the control circuit of described E quasi-converter circuit, formed by electric capacity and transformer, its electric capacity a bit is connected with load circuit, this circuit is used for controlling the work of E quasi-converter;

(2), described circuit of power factor correction, formed by diode and high frequency capacitance, its high frequency capacitance is connected with load circuit, the high-frequency energy of this circuit utilization feedback carries out power factor correction.

The operating frequency of described E quasi-converter is higher than 80KHz; The capacity of described high frequency capacitance is 20PF-1000PF.

The present invention has following good effect:

(1), realized the high frequency conversion of power supply, for the operate as normal of electrode-less gas discharge lamp provides effective and necessary high-frequency electromagnetic field energy;

(2), circuit simple in structure, help improving the reliability of work;

(3), circuit arrangement low cost, miniaturization.

Description of drawings

Fig. 1 is the schematic block circuit diagram of prior art.

Fig. 2 is a kind of working circuit diagram of the present invention.

Fig. 3 is two of embodiments of the invention.

Embodiment

Referring to Fig. 2, the operating circuit of a kind of electrode-less gas discharge lamp of the present invention comprises: line filter 1, bridge rectifier 2, circuit of power factor correction 3, capacitor 4, start-up circuit 5 and E quasi-converter circuit 6.Wherein: line filter 1 is made up of twin coil inductance T1 and filter capacitor C1, C2; Circuit of power factor correction 3 is made up of diode D1, D2 and high frequency capacitance C5, C6, and high frequency capacitance C5 links to each other with the B point of load circuit, and high frequency capacitance C6 links to each other with the C point of load circuit; Start-up circuit 5 is made up of resistance R, capacitor C 7, diode D5 and trigger tube DB, and the output of trigger tube DB links to each other with the end of transformer T2; E quasi-converter circuit 6 is made up of transistor Q, choking-winding L1, load circuit and control circuit; Its load circuit is made up of inductance L 2, loading coil L5 and capacitor C 8, C9, and its control circuit is made up of capacitor C 10 and transformer T2.

Referring to Fig. 2, electric network source inserts from E, F two-end-point, and electrode-less gas discharge lamp G is as the load of loading coil L5.Grid ac voltage is earlier through line filter 1, and noise and high-frequency interferencing signal are imported in filtering; Pass through the rectification of bridge rectifier D then, make low frequency ac be transformed into the direct current of pulsation; This galvanic most of energy is stored among the electrochemical capacitor C4, as the DC power supply of the E quasi-converter circuit 6 of back; Start-up circuit 5 is used for producing enabling signal, after start-up circuit 5 triggering work, makes the E quasi-converter startup work of back; After the E quasi-converter starts, the drive signal of E quasi-converter is provided by the control circuit that capacitor C 10 and transformer T2 are formed, because the C point on the load circuit of capacitor C 10 and E quasi-converter circuit 6 links to each other, it is coupled to transformer T2 to the part higher-order of oscillation energy of load circuit, so that the high-frequency signal of feedback drives E quasi-converter operate as normal, so the work of E quasi-converter belongs to self-oscillation work; The loading coil L5 of high-frequency energy on load circuit that self-oscillation produces is coupled to lamp load G; Because the high frequency capacitance C5 in the circuit of power factor correction, B point and the C point that C6 is connected to load circuit, they can be the part higher-order of oscillation energy back of load circuit to the A point, so that the high-frequency signal of power factor correction to be provided, thereby make the circuit of power factor correction operate as normal to improve the power factor of circuit.

Fig. 3 has provided an alternative embodiment of the invention, and it is compared with embodiment shown in Figure 2, and just diode D1, the D2 of its circuit of power factor correction are slightly different with high frequency capacitance C5, the C6 connected mode in circuit.

The foregoing description is the explanation of the principle of the invention, and those skilled in the art can design different embodiment in its scope.

Claims

1, a kind of operating circuit of electrode-less gas discharge lamp comprises:

A line filter is made up of twin coil inductance (T1) and the filter capacitor (C1, C2) that is connected across its two ends, is used for filtering input noise and high-frequency interferencing signal;

A bridge rectifier (D) is used for the AC power of electrical network input is transformed into DC power supply;

A capacitor (C4), it is coupled to described rectifier, is used for stored energy, as described DC power supply;

A start-up circuit is made up of resistance (R), electric capacity (C7), diode (D5) and trigger tube (DB), is used for producing enabling signal;

An E quasi-converter circuit is made up of transistor (Q), choking-winding (L1), load circuit (L2, L5, C8, C9) and control circuit, and this circuit produces high-frequency oscillation signal, for lamp load provides the high-frequency electromagnetic field energy;

It is characterized in that:

(1), the control circuit of described E quasi-converter circuit, formed by electric capacity (C10) and transformer (T2), its electric capacity (C10) is connected with load circuit a bit (C);

(2), described circuit of power factor correction, formed by diode (D1, D2) and high frequency capacitance (C5, C6), its high frequency capacitance (C5, C6) is connected with load circuit.

2, the operating circuit of electrode-less gas discharge lamp as claimed in claim 1 is characterized in that the operating frequency of described E quasi-converter is higher than 80KHz.

3, the operating circuit of electrode-less gas discharge lamp as claimed in claim 1 is characterized in that the capacity of described high frequency capacitance (C5, C6) is 20PF-1000PF.