WO2007062556A1

WO2007062556A1 - Ballast device in power saving and voltage regulation

Info

Publication number: WO2007062556A1
Application number: PCT/CN2006/001170
Authority: WO
Inventors: Junzhong Peng
Original assignee: Junzhong Peng
Priority date: 2005-12-02
Filing date: 2006-05-31
Publication date: 2007-06-07

Abstract

A ballast device in power saving and voltage regulation, comprises bridge rectifier circuit, electrolytic capacitor filter, half-bridge converter circuit, and LC output circuit in electrical series connection. The ballast device further comprises electromagnetic compatible (EMC) filter circuit for restraining the resonance wave current of high frequency from impacting the power network, power factor correction circuit with source for improving power factor, reducing resonance wave, realizing constant power output, abnormal state protect circuit for preventing the ballast device from damage in the abnormal state. The electromagnetic compatible (EMC) filter circuit is connected between the input end of voltage and bridge rectifier circuit. The power factor correction circuit with source is connected between the bridge rectifier circuit and electrolytic capacitor filter. The abnormal state protect circuit is set in the half-bridge converter circuit. The ballast device could resist instantaneous peak impulse and thunder interfere, restrain burst current, have multiple load output, delay startup, and prolong the life.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a power-saving and voltage-stabilizing ballast device, and more particularly to a power-saving ballast ballast device for use in a fluorescent lamp. BACKGROUND OF THE INVENTION In the current lighting fixture industry, the conventional universal ballast is composed of electrical components such as a power capacitor, a normally closed thermal switch, and a thermal resistance coil. The ballast has strong vibration noise and temperature. Lit, and there is light flashing. When the power is turned on, the lamp cannot be quickly lit. At the same time, due to the unstable mains voltage, the ballast and the lamp are easy to burn out, causing loss to the user.

The new ballast has been improved in some parts. The circuit includes bridge rectifier circuit, electrolytic capacitor filter circuit, half bridge inverter circuit and LC output circuit. It can reduce vibration noise and control temperature rise, and quickly start lighting. Other aspects have been improved, but there are still quite a few problems, such as the protection of abnormal state. The common abnormal state is divided into the following cases: One of the lamps or one of the lamps is not connected; the fluorescent lamp cannot be activated due to a cathode damage; although the cathode is intact, the lamp cannot be activated; the fluorescent lamp works, but the cathode An inactive or rectifying effect; a short circuit of the starter switch, etc.; usually an electronic ballast is used with a fluorescent tube (such as a T5, T8 straight tube or other shaped fluorescent tube), if an abnormal condition occurs during use, Will cause ballast damage. As an independent installation, the electronic ballast that can be replaced by the lamp must have an abnormal protection function. After the abnormal state occurs, the ballast can not be damaged. After replacing the new lamp or eliminating the abnormal state, the ballast should still be able to continue to use.

This is only the protection of abnormal state, existing in the lighting industry in terms of anti-overvoltage, suppression of inrush current, extension of lamp life, multi-load linkage, improvement of power factor, reduction of harmonics, realization of constant power output, etc. There are still many shortcomings in ballasts.

Therefore, it is necessary to invent a new power-saving and voltage-stabilizing ballast device to solve the above problems. SUMMARY OF THE INVENTION The object of the present invention is to provide a power-saving and voltage-stabilizing ballast device, which can resist the occurrence of grid voltage Instantaneous spike or strong lightning interference, effectively suppress surge current, improve line power factor, reduce harmonics, achieve constant power output, have abnormal protection function, suppress high frequency current harmonics to grid pollution, multi-load output, delay When starting up, extending the working life of the luminaire, using this kind of power-saving and voltage-stabilizing ballast device is enough to solve the problems in the prior art.

In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

A power-saving and voltage-stabilizing ballast device comprises a bridge rectifier circuit, an electrolytic capacitor filter circuit, a half-bridge inverter circuit and an LC output circuit, which are sequentially electrically connected, wherein the power-saving and voltage-stabilizing ballast device further comprises An electromagnetic compatibility filter EMC circuit for suppressing high-frequency current harmonics from polluting the power grid, an active power factor correction circuit for improving power factor, reducing harmonics, and realizing constant power output, to prevent abnormal state from being ballasted The device generates a damage abnormal state protection circuit, the electromagnetic compatibility filter EMC circuit is connected between the voltage input end and the bridge rectifier circuit, and the active power factor correction circuit is connected to the bridge rectifier circuit and the electrolytic capacitor filter circuit The abnormal state protection circuit is disposed in the half bridge inverter circuit.

The electromagnetic compatibility filter EMC circuit further includes an overvoltage protection circuit for preventing damage to the ballast device and related circuits by instantaneous spike or super high voltage interference, and the overvoltage protection circuit includes a zinc oxide pressure sensitive component.

The abnormal state protection circuit further includes an overcurrent protection circuit for suppressing a surge current, wherein the overcurrent protection circuit is a series current limiting resistor in the input circuit.

The abnormal state protection circuit further includes an overcurrent protection circuit for suppressing a surge current, wherein the overcurrent protection circuit is a series negative temperature coefficient NTC resistor in the input circuit.

The LC output circuit further includes a start preheating circuit for supplying a cathode of the fluorescent lamp to the preheating current and the warm-up time before the system voltage reaches the rated value, thereby avoiding the glow discharge and causing the cathode to be damaged. The preheating circuit heats the filament of the fluorescent lamp to a lighting temperature by the heat sensitive element.

The LC output circuit further includes a multi-load working circuit for simultaneously dragging two or more fluorescent lamps.

The active power factor correction circuit uses an APFC circuit.

The abnormal state protection circuit is a circuit that uses a transistor to detect the magnitude of the current to control the operation of the inverter circuit.

Optionally, the multi-load working circuit uses an LC multi-lamp series resonant circuit.

Optionally, the multi-load working circuit uses a current push-pull multi-lamp output circuit. The invention provides a power-saving and voltage-stabilizing ballast device design scheme, and the electromagnetic compatibility filter EMC circuit can suppress the high-frequency current harmonics from polluting the power grid; setting the active power factor correction circuit can improve the power factor, reduce the harmonics, and realize Constant power output; setting abnormal state protection circuit can prevent abnormal state from causing damage to ballast device; setting overvoltage protection circuit can prevent instantaneous spike or ultra high voltage interference from damage to ballast device and related circuits; setting overcurrent protection circuit It can suppress the inrush current; setting the start preheating circuit can avoid the glow discharge and cause the cathode to be damaged, thus prolonging the working life of the lamp; setting the multi-load working circuit can simultaneously drive two or more fluorescent lamps to work. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a prior art circuit;

2 is a schematic diagram of a circuit used in the present invention;

3 is a schematic diagram of an EMC circuit process of the electromagnetic compatibility filter of the present invention;

4 is a schematic diagram of an active power factor correction APFC circuit of the present invention;

5 is a schematic diagram of a prior art power factor correction PPFC circuit;

6 is a schematic diagram of an abnormal state protection circuit of the present invention;

7 is a schematic diagram of an overvoltage protection circuit of the present invention;

8 is a schematic diagram of an overcurrent protection circuit of the present invention;

9 is a schematic diagram of a startup preheating circuit scheme of the present invention;

10 is a schematic diagram of the second embodiment of the startup preheating circuit of the present invention;

11 is a schematic diagram of the third embodiment of the startup preheating circuit of the present invention;

12 is a schematic diagram of a multi-load working circuit scheme of the present invention;

FIG. 13 is a schematic diagram of the second embodiment of the multi-load working circuit of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION For a better understanding of the present invention, the following is explained by way of examples.

Referring to FIG. 2, a power-saving voltage-stabilized ballast device provided by the present invention includes a bridge rectifier circuit, an electrolytic capacitor filter circuit, a half-bridge inverter circuit, and an LC output circuit, which are sequentially electrically connected, and the power saving The voltage-stabilized ballast device also includes an electromagnetic compatibility filter EMC circuit for suppressing contamination of the power grid by high-frequency current harmonics, for improving power factor, reducing harmonics, and realizing constant power output. a source power factor correction circuit, an abnormal state protection circuit for preventing damage to the ballast device caused by an abnormal state, wherein the electromagnetic compatibility filter EMC circuit is connected between the voltage input terminal and the bridge rectifier circuit, the active power factor The correction circuit is connected between the bridge rectifier circuit and the electrolytic capacitor filter circuit, and the abnormal state protection circuit is disposed in the half bridge inverter circuit.

Referring to Fig. 3, an electromagnetic compatibility filter EMC circuit provided by the present invention is illustrated, which is composed of an inductor and a capacitor.

Referring to Figure 4, an active power factor corrected APFC circuit provided by the present invention is illustrated. Such power factor correction circuits use dedicated integrated circuits, transistors, and some peripheral components, which are called active power factor correction circuits because they involve active components.

Referring to Figure 6, an abnormal state protection circuit provided by the present invention is illustrated. Under normal operating conditions, setting the secondary winding to produce a voltage of only 20-25V (or lower) on capacitor C2 is not sufficient to turn DB3 on. Therefore, Q3 Q4 does not get enough base current and trigger current, and it is in the off and off state. At this time, the abnormal protection circuit does not work. In the event of an abnormal state, the voltage induced on C2 exceeds the trigger voltage of DB3, causing DB3 to conduct, thereby turning on Q3 Q4, causing the half-bridge inverter circuit to stop working and not triggering again.

Referring to Figure 7, an overvoltage protection circuit provided by the present invention is illustrated. A zinc oxide varistor is connected in parallel to its input circuit, which clips or limits the instantaneous spike of the grid voltage present in the input circuit, reducing the voltage applied to the ballast.

Referring to Figure 8, the overcurrent protection circuit provided by the present invention is illustrated. The best way to reduce the inrush current is to connect a current limiting resistor or a negative temperature coefficient (NTC) resistor in series with the input circuit. The NTC resistor is at room temperature. The lower cold resistance is larger, which can effectively suppress the inrush current.

Referring to any one of FIG. 9, FIG. 10 and FIG. 11, the starting preheating circuit provided by the present invention is illustrated. First, the cathode is required to reach the temperature required for the emission, that is, the cathode (ie, the filament) is provided. The current and a certain preheating time, before the cathode reaches the electron emission state, and before the cathode forms a sufficient electron fog, the voltage applied to both ends of the lamp should be low enough to avoid glow discharge and damage to the cathode.

Referring to any one of FIG. 12 and FIG. 13, the multi-load working circuit provided by the present invention is illustrated. The so-called multi-load working circuit is a ballast that simultaneously illuminates two or more lamps and continues to work. Line. The circuit has the advantages of convenient installation, high reliability, remarkable energy saving effect, low power grid pollution, low loss, etc. The invention adopts two kinds of electronic circuits: one is an LC multi-lamp series resonant circuit, and the other is a current push. Pull multiple lamp output lines. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the scope of the present invention remain within the scope of the present invention.

Claims

Rights request

1. A power-saving and voltage-stabilizing ballast device, comprising a bridge rectifier circuit, an electrolytic capacitor filter circuit, a half-bridge inverter circuit, and an LC output circuit, which are sequentially electrically connected, wherein the power-saving and voltage-stabilizing ballast device It also includes an EMC filter circuit for suppressing high-frequency current harmonics from polluting the power grid. An active power factor correction circuit for improving power factor, reducing harmonics, and achieving constant power output is used to prevent abnormal state pairs. The ballast device generates a damage abnormal state protection circuit, the electromagnetic compatibility filter EMC circuit is connected between the voltage input terminal and the bridge rectifier circuit, and the active power factor correction circuit is connected to the bridge rectifier circuit and the electrolytic capacitor filter Between the circuits, the abnormal state protection circuit is disposed in the half bridge inverter circuit.

2. The power-saving voltage-stabilized ballast device of claim 1, wherein the EMC circuit of the electromagnetic compatibility filter further comprises: preventing instantaneous spikes or ultra-high voltage interference from generating a ballast device and related circuits. A damaged overvoltage protection circuit, wherein the overvoltage protection circuit includes a zinc oxide pressure sensitive element.

3. The power-saving regulated ballast device of claim 1, wherein the abnormal state protection circuit further comprises an overcurrent protection circuit for suppressing a surge current, wherein the overcurrent protection circuit is at the input A series current limiting resistor in the circuit.

4. The power-saving regulated ballast device of claim 1, wherein the abnormal state protection circuit further comprises an overcurrent protection circuit for suppressing a surge current, wherein the overcurrent protection circuit is at the input A negative temperature coefficient NTC resistor is connected in series in the circuit.

5. The power-saving regulated ballast device of claim 1, wherein the LC output circuit further comprises a cathode for supplying a fluorescent lamp to preheat current and preheating before the system voltage reaches a rated value. Time, a start preheating circuit that avoids a glow discharge that causes damage to the cathode, and the start preheating circuit heats the filament of the fluorescent lamp to a lighting temperature by the heat sensitive element.

6. The power-saving voltage-stabilized ballast device of claim 1, wherein the LC output circuit further comprises a multi-load working power for simultaneously dragging two or more fluorescent lamps. Road.

7. The power-saving regulated ballast device of claim 1, wherein the active power factor correction circuit is an APFC circuit.

The power-saving regulated ballast device according to claim 1, wherein the abnormal state protection circuit is a circuit that detects a magnitude of a current by using a transistor to control an operation of the inverter circuit.

9. The power-saving regulated ballast device of claim 6, wherein the multi-load working circuit employs an LC multi-lamp series resonant circuit.

10. The power-saving regulated ballast device of claim 6, wherein the multi-load operating circuit employs a current push-pull multi-lamp output circuit.