CN2817287Y - Full-bridge changing electronic ballast - Google Patents

Abstract

The utility model discloses a full-bridge conversion type electron ballast of a full-bridge driving circuit, which comprises a power supply input unit, a filtering unit and a starting unit. The utility model is characterized in that the output end of the starting unit is connected with electronic switches Q1, Q2, Q3 and Q4 which are respectively in a full-bridge type structure; protective diodes D1, D2, D3 and D4 are respectively connected in parallel beside the electronic switches Q1, Q2, Q3 and Q4; Q1 and Q4 form a pair of bridge arms, and Q2 and Q3 form a pair of bridge arms; an XY load branch circuit and a main winding L1 are arranged between bridge circuits M and N points; the bridge circuits M and N, the bridge arms of Q1 and Q4, the bridge arms of Q2 and Q3, and a power supply form a working loop; a driving circuit B is arranged between the driving ends of the electronic switches Q1, Q2, Q3 and Q4 and the bridge circuits M and N, and the driving circuit B is composed of five groups of independent coils L1, L2, L3, L4 and L5 which are wound in series on a magnetic ring. The utility model solves the bottleneck problem that the full-bridge conversion type circuit is generalized and used in electron ballast and relevant fields.

Description

Full-bridge transform electric ballast

Technical field

The utility model relates to a kind of electric ballast, particularly a kind of full-bridge transform electric ballast.

Background technology

Electric ballast in existing free-standing electric ballast and the self-ballasted fluorescent lamp (electricity-saving lamp), its circuit structure form overwhelming majority is " voltage feed half bridge converter circuit ", be characterized in: 1. the transistorized requirement of withstand voltage of power switch (electronic switch) is lower, never surpasses bus voltage value; 2. the transistor saturation voltage drop is less; 3. be in series with automatic correction capacitor C at load circuit, avoid magnetic core saturated; 4. compare with " voltage feed push-pull converter circuit ", export identical power, the electronic switch transistor must flow through the electric current of twice.

The characteristics of " voltage feed push-pull converter circuit " are: 1. drive circuit is simple, and the required electric current of electronic switch transistor is less relatively; 2. the transistorized voltage rating of electronic switch is higher, needs 3.3 times of circuit busbar voltage usually, and such electronic switch costs an arm and a leg; 3. the magnetic core of high frequency transformer is very easily sent out magnetic saturation, because do not have block isolating circuit in the high frequency transformer primary return, the circuit imbalance is arranged slightly, and very little DC deviation just can cause magnetic core saturated.

The characteristics of " voltage feed full-bridge converter circuit " are: 1. kept the voltage character of " voltage feed half bridge converter circuit ", promptly the transistorized requirement of withstand voltage of power electronic switching never surpasses bus voltage value; 2. kept the electric current character of " voltage feed is pushed off the formula converter circuit ", when promptly exporting identical power, the electronic switch transistor current is less, is half of half-bridge circuit; 3. the transistorized quantity of electronic switch is the twice of " voltage feed half bridge converter circuit " or " voltage feed is pushed off the formula converter circuit ", i.e. four electronic switch transistors, and need four groups of electronic switch transistor driver circuits of isolating mutually, the cost of control Driver Circuit is very high.

Just because of the control Driver Circuit of full-bridge circuit is complicated and cost an arm and a leg, cause full-bridge circuit to use seldom.Only there is a spot of integrated circuit manufacturer to release the full-bridge driver IC circuits at present, as the IR2153.IR2111 combination, UCC3895, UCC3879, UBA2032T/TS etc., as shown in Figure 5.

Summary of the invention

The purpose of this utility model is to provide a kind of simple in structure for the deficiency that solves above-mentioned technology, both there be not big current requirements, have or not the high voltage requirement, do not have the saturated danger of inductance core, and the full-bridge transform electric ballast of cheap reliable quality full bridge driving circuit.

In order to achieve the above object; a kind of full-bridge transform electric ballast that the utility model is designed; comprise conventional power supply input; filter unit and start unit; it is characterized in that the output at start unit is connected with the electronic switch Q1 of full-bridge type structure; Q2; Q3; Q4; at Q1; Q2; Q3; Q4 is other respectively and be connected to protection diode D1; D2; D3; D4; Q1; Q4 constitutes a pair of brachium pontis; Q2; Q3 constitutes a pair of brachium pontis; bridge circuit M; the N point-to-point transmission contains XY load branch and main winding L1; bridge circuit M; N and brachium pontis Q1; Q4 and Q2; Q3 and power supply composition work loop; at electronic switch Q1; Q2; Q3; the drive end of Q4 and bridge circuit M; be provided with drive circuit B between N; drive circuit B is by five groups of absolute coil L1; L2; L3; L4; the L5 string constitutes on magnet ring; five groups of absolute coil L1; L2; L3; L4; L5 can constitute drive circuit B on same magnet ring; the L1 winding can be serially connected with Y; between 2 of the N, also can be serially connected with X; between 2 of the M.In addition, also L1 can be divided into L11, L12, and be around in a magnet ring by L11, L2, L3 and constitute drive circuit B1, L12, L4, L5 are around in the another magnet ring and constitute drive circuit B2, and L11, L12 are serially connected between M, the N point; Can be serially connected between capacitor C and the FL as L11, L12 can be serially connected between L and the FL.

The peripheral auxiliary circuits R1 that on electronic switch Q1, Q2, Q3, Q4, also can be respectively equipped with, RD1, R2, RD2, R3, RD3, R4, RD4, they both can be the resistance on the single meaning, also can be the combinations of resistance, electric capacity, diode.

Q1, Q2, Q3, Q4 is a power electronic switching, is made of semi-conducting material, can be transistor, also field effect transistor, igbt, double pole mode static induction transistor etc.

L1, L2, L3, L4, L5 equate by L2, L3, L4, L5 wire circle, the L1 wire circle according to the design needs more than or equal to or less than the principle string of L2, L3, L4, L5 five groups of absolute coils in the magnet ring, what mark stain is end of the same name, L2 controls Q1, L3 controls Q2, L4 controls Q3, and L5 controls Q4.

In addition,, before filter unit, can add conventional rectification unit and Electromagnetic interference filter circuit unit for satisfying the needs of Alternating Current Power Supply occasion, however before the Electromagnetic interference filter circuit unit input ac power.

A kind of full-bridge transform electric ballast that the utility model is designed, its operation principle is: start-up circuit is started working behind power connection, start-up circuit can make Q1, Q2, any electronic switch conducting of Q3, Q4, in this example, suppose the Q2 conducting, M point current potential descends, make and equipotential 2 disequilibriums of M, N originally pulse current is arranged from positive source → electronic switch Q3 → RD3 → N point → Y point → L → FL and C1 → C → X point → L1 main winding → M point → electronic switch Q2 → RD2 → power cathode.Because the coupling of magnetic ring transformer B, in auxiliary winding L2, L3, L4, L5, induce induced electromotive force and induced current, induced current among L3, the L4 makes the complete conducting of Q2, Q3 respectively, induced electromotive force among L2, the L5 makes the control of Q1, Q4 extremely partially anti-respectively, Q1, Q4 end fully, and magnetic ring transformer B enters saturation condition.

After magnetic ring transformer B enters saturation condition, auxiliary winding L2, L3, L4, induced electromotive force among the L5 is zero, L3, electric current among the L4 does not stop owing to effect of inertia, reduce but transfer to from increase, magnetic ring transformer B withdraws from saturation condition, L2, L3, L4, induced electromotive force counter-rotating among the L5, L2, induced electromotive force among the L5 makes Q1 respectively, the control utmost point positively biased conducting of Q4, after this because the effect L2 of positive feedback, the induced potential that induces among the L5 makes Q1, the complete conducting of Q4, the sense of current are positive source → electronic switch Q1 → RD1 → M point → main winding L1 → X point → C → FL and C1 → L → Y point → N point → electronic switch Q4 → RD4 → power cathode.Induced electromotive force among L3, the L4 makes the control of Q2, Q3 extremely partially anti-respectively, and Q2, Q3 end fully, and magnetic ring transformer B enters saturation condition once more.

After magnetic ring transformer B enters saturation condition, induced electromotive force among auxiliary winding L2, L3, L4, the L5 is zero, electric current among L2, the L5 does not stop owing to effect of inertia, reduce but transfer to from increase, magnetic ring transformer B withdraws from saturation condition, induced electromotive force among L2, L3, L4, the L5 reverses once more, and the induced electromotive force among L3, the L4 makes the control utmost point positively biased conducting of Q2, Q3 respectively, repeats the process of front.Q2, Q3, Q1, Q4 alternate conduction and end obtain the high-frequency alternating voltage supply load at output XY two ends.

A kind of full-bridge transform electric ballast that the utility model obtains, solved the bottleneck problem that present full-bridge transform circuit is promoted the use of in electric ballast and association area, increasing slightly under the condition of cost, the advantage that integrates half bridge converter and push-pull converter, both there be not the requirement of half bridge converter to the big electric current of electronic switch, there is not push-pull converter again to the requirement of electronic switch high voltage, simultaneously do not have the saturated danger of inductance L magnetic core again, electric ballast is accomplished simply, at a low price, reliably.Be particularly suitable for the electric ballast of low-voltage high-power.The electric ballast of this full bridge structure can be applicable to direct current 6V-400V, exchanges the work down of 6V-260V voltage.Particularly can be applicable to the electric ballast in free-standing electric ballast and the integrated energy-saving lamp.

Description of drawings

Fig. 1 is the enforcement illustration under the direct current supply state;

Fig. 2 is the enforcement illustration under the Alternating Current Power Supply state;

Fig. 3 is that the another kind under the direct current supply state is implemented illustration;

Fig. 4 is the enforcement illustration that two magnet rings drive;

Fig. 5 is the full-bridge converter circuit diagram that integrated circuit (IC) drives;

Fig. 6, Fig. 7, Fig. 8, Fig. 9 are the connecting mode embodiment connection diagrams of load;

Figure 10 is the coil winding arrangement schematic diagram of drive circuit B;

Figure 11, Figure 12 are the structural representation of drive circuit B when being separated into B11, B12.

Embodiment

The utility model will be further described in conjunction with the accompanying drawings below by embodiment.

Embodiment 1:

As shown in Figure 1; a kind of full-bridge transform electric ballast that present embodiment is described; comprise conventional power supply input 1; filter unit 2 and start unit 3; be connected with the electronic switch Q1 of full-bridge type structure at the output of start unit 3; Q2; Q3; Q4; at Q1; Q2; Q3; Q4 is other respectively and be connected to protection diode D1; D2; D3; D4; Q1; Q4 constitutes a pair of brachium pontis; Q2; Q3 constitutes a pair of brachium pontis; bridge circuit M; the N point-to-point transmission contains XY load branch and main winding L1; bridge circuit M; N and brachium pontis Q1; Q4; Q2; Q3 and power supply composition work loop; at electronic switch Q1; Q2; Q3; the drive end of Q4 and bridge circuit M; be provided with drive circuit B between N; drive circuit B is by five groups of absolute coil L1; L2; L3; L4; the L5 string constitutes (as shown in figure 10), five groups of absolute coil L1 on magnet ring 4; L2; L3; L4; L5 can constitute drive circuit B on same magnet ring.The peripheral auxiliary circuits R1 that on Q1, Q2, Q3, Q4, is respectively equipped with, RD1, R2, RD2, R3, RD3, R4, RD4, they can be the combinations of resistance, electric capacity, diode, as R1, R2, R3, the R4 combination that can be an electric capacity connect with a resistance with a diode parallel connection again; RD1, RD2, RD3, RD4 can be a resistance and an in parallel or tandem compound of diode.Q1, Q2, Q3, Q4 is a power electronic switching, is made of semi-conducting material, can be transistor, also field effect transistor, igbt, double pole mode static induction transistor etc.L1, L2, L3, L4, L5 equate by L2, L3, L4, L5 wire circle, the L1 wire circle according to the design needs more than or equal to or less than the principle string of L2, L3, L4, L5 five groups of absolute coils in the magnet ring, what mark stain is end of the same name, L2 controls Q1, L3 controls Q2, L4 controls Q3, and L5 controls Q4, and L1 is serially connected with between 2 of X, the M (as shown in Figure 1 and Figure 2).

Embodiment 2:

As shown in Figure 2, a kind of full-bridge transform electric ballast that present embodiment is described, when being used for AC power, can before filter unit 2, add conventional rectification unit 5 and Electromagnetic interference filter circuit unit 6, however before Electromagnetic interference filter circuit unit 6 input ac power 1.Because filter unit 2, rectification unit 5 and Electromagnetic interference filter circuit unit 6 all are the custom circuit unit, are not described in detail at this.

Embodiment 3:

As shown in Figure 3, coil windings L1 also can be serially connected with between 2 of Y, the N in the bridge circuit, plays the effect identical with embodiment 1.

Embodiment 4:

As shown in Figure 4, a kind of full-bridge transform electric ballast that present embodiment is described can be divided into coil windings L1 L11, L12, as Figure 11, shown in Figure 12, is around on the magnet ring 41 by L11, L2, L3 and constitutes drive circuit B1; L12, L4, L5 are around in and constitute drive circuit B2 on the another magnet ring 42, coil windings L11, L12 are serially connected between bridge circuit M, the N point, but be not limited to position shown in Figure 4, can be serially connected between capacitor C and the illuminating lamp FL as coil windings L11, coil windings L12 can be serially connected between inductor L and the illuminating lamp FL.When using installation, the connecting mode of load can be as Fig. 6, Fig. 7, Fig. 8, shown in Figure 9.

Claims (8)

1; a kind of full-bridge transform electric ballast; comprise conventional power supply input; filter unit and start unit; it is characterized in that the output at start unit is connected with the electronic switch Q1 of full-bridge type structure; Q2; Q3; Q4; at Q1; Q2; Q3; Q4 is other respectively and be connected to protection diode D1; D2; D3; D4; Q1; Q4 constitutes a pair of brachium pontis; Q2; Q3 constitutes a pair of brachium pontis; bridge circuit M; the N point-to-point transmission contains XY load branch and main winding L1; bridge circuit M; N and brachium pontis Q1; Q4 and Q2; Q3 and power supply composition work loop; at electronic switch Q1; Q2; Q3; the drive end of Q4 and bridge circuit M; be provided with drive circuit B between N, drive circuit B is by five groups of absolute coil L1; L2; L3; L4; the L5 string constitutes on magnet ring.

2, a kind of full-bridge transform electric ballast according to claim 1 is characterized in that five groups of absolute coil L1, L2, L3, L4, L5 constitute drive circuit B on same magnet ring.

3, a kind of full-bridge transform electric ballast according to claim 1 and 2 is characterized in that the L1 winding is serially connected with between Y, the N at 2.

4, a kind of full-bridge transform electric ballast according to claim 1 and 2 is characterized in that the L1 winding is serially connected with between X, the M at 2.

5, a kind of full-bridge transform electric ballast according to claim 1, it is characterized in that among five groups of absolute coil L1, L2, L3, L4, the L5 L1 being divided into L11, L12, and be around in a magnet ring by L11, L2, L3 and constitute drive circuit B1, L12, L4, L5 are around in the another magnet ring and constitute drive circuit B2, and L11, L12 are serially connected between M, the N point.

6,, it is characterized in that peripheral auxiliary circuits R1, the RD1 that on electronic switch Q1, Q2, Q3, Q4, can be respectively equipped with, R2, RD2, R3, RD3 and R4, RD4 according to claim 1 or 2 or 5 described a kind of full-bridge transform electric ballasts.

7, a kind of full-bridge transform electric ballast according to claim 3 is characterized in that peripheral auxiliary circuits R1, the RD1 that can be respectively equipped with, R2, RD2, R3, RD3 and R4, RD4 on electronic switch Q1, Q2, Q3, Q4.

8, a kind of full-bridge transform electric ballast according to claim 4 is characterized in that peripheral auxiliary circuits R1, the RD1 that can be respectively equipped with, R2, RD2, R3, RD3 and R4, RD4 on electronic switch Q1, Q2, Q3, Q4.

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