CN214627420U

CN214627420U - Electronic ballast

Info

Publication number: CN214627420U
Application number: CN202022660664.4U
Authority: CN
Inventors: 杜龙彬; 郭健; 李昌骏
Original assignee: Golden Scorpion Co ltd
Current assignee: Golden Scorpion Co ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-11-05
Anticipated expiration: 2030-11-17

Abstract

The utility model relates to an electronic ballast, which solves the technical problems of complex wiring and thick input line, and comprises a three-phase alternating current input end and a rectifying unit connected with the three-phase alternating current input end, wherein the rectifying unit is connected with a bridge circuit unit for power factor correction and used as rectifier output; the technical scheme that the alternating current input end is connected with three phase branches of three-phase alternating current better solves the problem and can be used in electronic ballasting.

Description

Electronic ballast

Technical Field

The utility model relates to an electronic ballast field, concretely relates to electronic ballast.

Background

An Electronic ballast (Electronic ballast), which is a kind of ballast, refers to an Electronic device that uses Electronic technology to drive an electric light source to generate required illumination. Corresponding to this is an inductive ballast (or ballast). Modern fluorescent lamps are increasingly provided with electronic ballasts, which are light and small, and even can integrate the electronic ballasts with lamp tubes and the like, and meanwhile, the electronic ballasts can have the function of a starter, so that the independent starter can be omitted. The electronic ballast can also have more functions, such as improving or eliminating the flickering phenomenon of the fluorescent lamp by increasing the current frequency or the current waveform (such as changing the current waveform into a square wave); the fluorescent lamp can use a direct current power supply through a power supply inversion process. Some of the disadvantages of conventional inductive rectifiers are making them being replaced by increasingly sophisticated electronic ballasts.

The existing electronic ballast has the problems that wiring is troublesome, and a very thick zero line and live wire are needed to be used due to high current. The utility model provides an electronic ballast uses three-phase alternating current input, connects full-bridge circuit or half-bridge circuit after the rectification, can agree with the service environment that environment such as present agriculture all are three-phase electricity, solves aforementioned technical problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the wiring that exists is complicated among the prior art, the thick technical problem of input line. A new electronic ballast is provided, which has the characteristics of simpler and more convenient wiring, and no need of using a thick input line, thereby reducing construction and materials.

In order to solve the technical problems, the technical scheme is as follows:

an electronic ballast comprises a three-phase alternating current input end and a rectifying unit connected with the three-phase alternating current input end, wherein the rectifying unit is connected with a bridge circuit unit for power factor correction and used as the output of an electronic rectifier; the alternating current input end is connected with three phase branches of three-phase alternating current.

The utility model discloses a theory of operation: the utility model discloses be not applicable to traditional double-phase alternating current, be applicable to the circumstances that environments such as agriculture all are three-phase electricity. The existing electronic ballast has two input ends, which are troublesome in wiring, and needs to use a thick zero line live wire due to large current. The utility model discloses a three-phase alternating current input and three-phase alternating current one-to-one are connected, need not arrange extra cable. Meanwhile, the voltage of the three-phase ballast after rectification is different from that of the two phases, and the output voltage of the three-phase electronic ballast is basically direct current, so that a large-specification point-discharge capacitor is not needed, the power factor of the three-phase electronic ballast can meet the standard of more than 0.95.

In the above scheme, for optimization, the bridge circuit unit is a full bridge circuit unit or a half bridge circuit unit.

Furthermore, the front section of the rectifying unit is connected with a filtering unit.

Furthermore, the filtering unit is composed of an inductor L1, an inductor L2, an inductor L3, a capacitor CA1, a capacitor CA2 and a capacitor CA 3; the inductor L1 is connected to the 1 st AC input end of the three-phase AC input ends, the inductor L2 is connected to the 2 nd AC input end, and the inductor L3 is connected to the 3 rd AC input end; a capacitor CA1 and a capacitor CA2 are connected between the 2 nd end of the inductor L1 and the 2 nd end of the inductor L2 in parallel, and a capacitor CA3 is connected between the 2 nd end of the inductor L3 and the 2 nd end of the inductor L2.

Further, the rectifying unit is composed of a diode D1, a diode D2, a diode D3, a diode D4, a diode D5 and a diode D6; one end of the capacitor CA2, one end of the capacitor CA2 and the 2 nd end of the inductor L1 are connected to V through a forward diode D1_DCA voltage terminal connected to the GND terminal through a reverse diode D4;

the other end of the capacitor CA2, the other end of the capacitor CA2, one end of the capacitor CA3 and the 2 nd end of the inductor L2 are connected to V through a forward diode D2_DCA voltage terminal connected to the GND terminal through a reverse diode D5;

the 2 nd ends of the meter inductors L3 at the other ends of the capacitors CA3 are connected to V through forward diodes D3_DCThe voltage terminal is connected to the GND terminal through a reverse diode D6.

Further, the half-bridge circuit unit comprises a pin 1 connection V of a p-type MOSFET_BA2 nd pin of the voltage end is connected with the power amplifier and a1 st pin of the N-type MOSFET, and a3 rd pin of the voltage end is connected with the time-sharing driving unit; the time-sharing driving unit is connected with the level conversion circuit unit; the level conversion circuit unit is connected with the voltage stabilizing module which is connected with the voltage V_DCA voltage terminal.

Further, the time-sharing driving unit comprises an OUTPUT end connected with a3 rd pin of the p-type MOSFET; the OUTPUT end is connected with the 2 nd pin P2 of the PMOS tube and the MN of the NMOS tube₄No. 1 foot_、NMOS tube MN₃No. 1 foot_、NMOS tube MN₂A1 st pin and a2 nd pin of a PMOS pipe P1; the 3 rd pin of the PMOS pipe P1 is connected with an NMOS pipe MN₁A1 st pin and a resistor R5, the other end of the resistor R5 is connected to the 1 st pin and V of the PMOS tube P1_BVoltage terminal, diode DZ₁An anode, a resistor R6 and a1 st pin of a PMOS tube P2;

diode DZ₁Cathode-connected diode DZ₂The other end of the resistor R6 is connected with the 3 rd pin of the p-type MOSFET;

NMOS tube MN₄No. 2 pin NMOS tube MN₃No. 2 pin NMOS tube MN₂No. 2 pin NMOS tube MN₁The 2 nd pin is respectively connected to the GND terminal through a resistor R4, a resistor R3, a resistor R2 and a resistor R1, and the NMOS transistor MN₄No. 3, NMOS transistor MN₃No. 3, NMOS transistor MN₂No. 3, NMOS transistor MN₁The 3 rd pins are respectively connected with clock control signals n4, n3, n2 and n1 which form time-sharing control.

The utility model has the advantages that: the utility model discloses it is more simple and convenient to lay wire when industry and agriculture uses, also need not use thick input line to construction and material etc. expense have been reduced. The rectified voltage is different from the rectified voltage of two phases, and the output voltage of the three-phase electronic ballast is basically direct current, so that the power factor of the three-phase electronic ballast can meet >0.95 without using a large-specification dot-discharge capacitor.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1, schematic diagram 1 of an electronic ballast in embodiment 1.

Fig. 2 is a schematic diagram of an output of the rectifying unit in embodiment 1.

Fig. 3, a graph of luminous flux test data in example 1.

Fig. 4 is a schematic diagram of a half-bridge circuit unit in embodiment 1.

Fig. 5 is a schematic view of the time-sharing driving unit in embodiment 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

The present embodiment provides an electronic ballast, as shown in fig. 1, the electronic ballast includes a three-phase ac input terminal, a rectifying unit connected to the three-phase ac input terminal, the rectifying unit being connected to a bridge circuit unit for power factor correction as an electronic rectifier output; the alternating current input end is connected with three phase branches of three-phase alternating current.

The embodiment is not suitable for traditional two-phase alternating current and is suitable for the situation that the environments such as agriculture and the like are all three-phase electricity. The existing electronic ballast has two input ends, which are troublesome in wiring, and needs to use a thick zero line live wire due to large current. The utility model discloses a three-phase alternating current input and three-phase alternating current one-to-one are connected, need not arrange extra cable. Meanwhile, the voltage of the three-phase ballast after rectification is different from that of the two phases, and the output voltage of the three-phase electronic ballast is basically direct current, so that a large-specification point-discharge capacitor is not needed, the power factor of the three-phase electronic ballast can meet the standard of more than 0.95.

Specifically, the bridge circuit unit is a full bridge circuit unit or a half bridge circuit unit.

Preferably, a filtering unit is connected to the front section of the rectifying unit.

Specifically, as shown in fig. 1, the filtering unit is composed of an inductor L1, an inductor L2, an inductor L3, a capacitor CA1, a capacitor CA2 and a capacitor CA 3; the inductor L1 is connected to the 1 st AC input end of the three-phase AC input ends, the inductor L2 is connected to the 2 nd AC input end, and the inductor L3 is connected to the 3 rd AC input end; a capacitor CA1 and a capacitor CA2 are connected between the 2 nd end of the inductor L1 and the 2 nd end of the inductor L2 in parallel, and a capacitor CA3 is connected between the 2 nd end of the inductor L3 and the 2 nd end of the inductor L2.

Specifically, as shown in fig. 1, the rectifying unit is composed of a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, and a diode D6; one end of a capacitor CA2, one end of a capacitor CA2 and an inductor L1The 2 nd terminals are connected to V through forward diodes D1_DCA voltage terminal connected to the GND terminal through a reverse diode D4; the other end of the capacitor CA2, the other end of the capacitor CA2, one end of the capacitor CA3 and the 2 nd end of the inductor L2 are connected to V through a forward diode D2_DCA voltage terminal connected to the GND terminal through a reverse diode D5; the 2 nd ends of the meter inductors L3 at the other ends of the capacitors CA3 are connected to V through forward diodes D3_DCThe voltage terminal is connected to the GND terminal through a reverse diode D6.

Fig. 2 is an output curve of the rectifying unit.

Preferably, as shown in fig. 4, the half-bridge circuit unit comprises a pin 1 connection V of a p-type MOSFET transistor_BA2 nd pin of the voltage end is connected with the power amplifier and a1 st pin of the N-type MOSFET, and a3 rd pin of the voltage end is connected with the time-sharing driving unit; the time-sharing driving unit is connected with the level conversion circuit unit; the level conversion circuit unit is connected with the voltage stabilizing module which is connected with the voltage V_DCA voltage terminal.

In order to realize the extreme working condition that the power amplifier in the electronic rectifier works alternately in a continuous wave working state and a pulse working state. This embodiment eliminates the charge pump circuit unit of the conventional driver and provides a half-bridge circuit unit with a small circuit size. Unlike the original half-bridge driving unit, the present embodiment adopts a composite driving structure with one side PMOS driving and one side NMOS driving. The NMOS driving side can be internally provided with a chip, so that the scale of a peripheral circuit is reduced. When the PMOS is driven, the external PMOS power tube is directly driven, thereby using the working voltage V_BThe direct power supply avoids adopting a charge pump type structure and simplifies the circuit structure. Meanwhile, the PMOS power tube has normally open capacity, can cope with two working conditions of pulse input signals and continuous wave input signals, and can be switched randomly, the ground of the PMOS driving part is not connected out, an external capacitor is not adopted, and a time-sharing driving unit is adopted.

As shown in fig. 5, specifically, the time-sharing driving unit includes an OUTPUT terminal connected to pin 3 of the p-type MOSFET transistor; the OUTPUT end is connected with the 2 nd pin P2 of the PMOS tube and the MN of the NMOS tube₄No. 1 foot_、NMOS tube MN₃No. 1 foot_、NMOS tube MN₂A1 st pin and a2 nd pin of a PMOS pipe P1; PMOS pipe P1 pin 3Is connected with an NMOS tube MN₁A1 st pin and a resistor R5, the other end of the resistor R5 is connected to the 1 st pin and V of the PMOS tube P1_BVoltage terminal, diode DZ₁An anode, a resistor R6 and a1 st pin of a PMOS tube P2;

The signals n 1-n 4 control the switches respectively. NMOS tube MN₁～MN₄And PMOS transistor MP₁、MP₂The switching function is realized. The circuit current is controlled by resistors R1-R4, and the action of a clamper is realized by Zener diodes DZ1 and DZ 2. The R2 and R4 resistors respectively limit the switching tube MN₂、MN₄The current when conducting is matched with the clamping diode DZ1 and the clamping diode DZ2 to realize voltage drop clamping, and the voltage drop of the level when MN2 or MN4 is conducted does not exceed a preset value. Since the resistance value of R2 is only 1/y of that of R4, the voltage drop of the PMOS transistor in the opening stage is slightly larger than MN₄Voltage drop of OUTPUT when on.

As shown in fig. 3, the luminous flux test data is input at 380V, and the 1000W high-pressure sodium lamp test is output: the luminous flux of the ballast is about 2% higher than that of the traditional two-phase electronic ballast.

Although the invention has been described with respect to illustrative embodiments thereof so that those skilled in the art can understand the invention, it is to be understood that the invention is not limited to the disclosed embodiments, but rather, is intended to cover all modifications and variations within the spirit and scope of the invention as defined and defined by the appended claims.

Claims

1. An electronic ballast, characterized by: the electronic ballast comprises a three-phase alternating current input end and a rectifying unit connected with the three-phase alternating current input end, wherein the rectifying unit is connected with a bridge circuit unit for power factor correction and used as the output of a rectifier; the alternating current input end is connected with three phase branches of three-phase alternating current.

2. The electronic ballast of claim 1, wherein: the bridge circuit unit is a full bridge circuit unit or a half bridge circuit unit.

3. The electronic ballast of claim 1, wherein: the front section of the rectifying unit is connected with a filtering unit.

4. The electronic ballast of claim 3, wherein: the filtering unit consists of an inductor L1, an inductor L2, an inductor L3, a capacitor CA1, a capacitor CA2 and a capacitor CA 3; the inductor L1 is connected to the 1 st AC input end of the three-phase AC input ends, the inductor L2 is connected to the 2 nd AC input end, and the inductor L3 is connected to the 3 rd AC input end; a capacitor CA1 and a capacitor CA2 are connected between the 2 nd end of the inductor L1 and the 2 nd end of the inductor L2 in parallel, and a capacitor CA3 is connected between the 2 nd end of the inductor L3 and the 2 nd end of the inductor L2.

5. The electronic ballast of claim 4, wherein: the rectifying unit consists of a diode D1, a diode D2, a diode D3, a diode D4, a diode D5 and a diode D6; one end of the capacitor CA2 and the 2 nd end of the inductor L1 are connected to V through a forward diode D1_DCA voltage terminal connected to the GND terminal through a reverse diode D4;

the other end of the capacitor CA2, one end of the capacitor CA3 and the 2 nd end of the inductor L2 are connected to V through a forward diode D2_DCA voltage terminal connected to the GND terminal through a reverse diode D5;

the 2 nd ends of the meter inductors L3 at the other ends of the capacitors CA3 are connected to V through forward diodes D3_DCVoltage terminal by reverse connectionThe diode D6 is connected to the GND terminal.

6. The electronic ballast of claim 2, wherein: the half-bridge circuit unit comprises a p-type MOSFET (metal-oxide-semiconductor field effect transistor) pin 1 connected with a V_BA2 nd pin of the voltage end is connected with the power amplifier and a1 st pin of the N-type MOSFET, and a3 rd pin of the voltage end is connected with the time-sharing driving unit; the time-sharing driving unit is connected with the level conversion circuit unit; the level conversion circuit unit is connected with the voltage stabilizing module which is connected with the voltage V_DCA voltage terminal.

7. The electronic ballast of claim 6, wherein: the time-sharing driving unit comprises an OUTPUT end connected with the 3 rd pin of the p-type MOSFET; the OUTPUT end is connected with the 2 nd pin P2 of the PMOS tube and the MN of the NMOS tube₄No. 1 foot_、NMOS tube MN₃No. 1 foot_、NMOS tube MN₂A1 st pin and a2 nd pin of a PMOS pipe P1; the 3 rd pin of the PMOS pipe P1 is connected with an NMOS pipe MN₁A1 st pin and a resistor R5, the other end of the resistor R5 is connected to the 1 st pin and V of the PMOS tube P1_BVoltage terminal, diode DZ₁An anode, a resistor R6 and a1 st pin of a PMOS tube P2;