JP3157446U - Electronic ballast - Google Patents

Abstract

An electronic ballast capable of accurately detecting gas leakage from a fluorescent lamp is provided. When a voltage difference between both ends of a fluorescent lamp is increased, the increased potential of the inductance element is detected by a sense unit and output as a detection signal. This detection signal is rectified and output as a drive potential by the drive circuit 431 of the control unit. When the drive potential is equal to or higher than the Zener voltage of the Zener diode Z01, the Zener diode Z01 is turned on and the diode D03 is turned on. The protection module is activated by the conduction of the diodes Z01 and D03, and the high frequency resonance lighting module 3 is disabled. Accordingly, the lighting of the fluorescent lamp 200 can be stopped, and the electronic ballast can be prevented from being destroyed. [Selection] Figure 1

Description

  The present invention relates to an electronic ballast used to stabilize lighting of a fluorescent lamp.

  In general, when a fluorescent lamp is directly connected to a power source due to its negative characteristics, once the lamp current starts to flow, the current rapidly increases, and the electrodes and sealing portions of the arc tube are instantaneously destroyed. On the other hand, a fluorescent lamp in which an electronic ballast that oscillates at a high frequency of several tens of kilohertz to light a fluorescent lamp is inserted and connected between an AC power source and the lamp can control the lamp current appropriately and stabilize the discharge of the lamp. The state can be maintained, there is little noise and flicker, the power used for lighting can be reduced, and the life of the fluorescent lamp can be extended. For this reason, such fluorescent lamps are being generalized.

  When a fluorescent lamp is used, it usually lights up with a gas leak due to aging of the fluorescent lamp and turns red, and then turns off. When the fluorescent lamp is lit in red, both ends of the lamp are in a high voltage state, so that there is a risk of electric shock if the user touches the lamp by mistake, and there is a possibility that the ballast will be burned out due to a change in voltage.

  Therefore, by providing a gas leakage prevention protection means that can detect gas leakage, it is intended to prevent gas leakage due to aging of the fluorescent lamp and improve safety, but fluorescent lamps arranged at long distances through a long cord Since the stray capacitance on the long cord is large when the light is turned on, the gas leakage prevention protection means detects that gas is leaking into the fluorescent lamp and tries to avoid the destruction of the lighting equipment. Since it works to cut off, it becomes inconvenient in use. In addition, since the user also replaces the lamp for safety in use, there is a problem that a fluorescent lamp that can still be used is actually wasted.

  The present invention has been made in view of the above problems, and an object thereof is to provide an electronic ballast capable of accurately detecting gas leakage from a fluorescent lamp.

  To achieve the above object, the present invention provides an electronic ballast for lighting a fluorescent lamp disposed between a power source and a fluorescent lamp, and is electrically connected to both ends of the fluorescent lamp to turn on the fluorescent lamp. A high-frequency resonant lighting module that generates and oscillates a high-frequency voltage, and a protection module that is connected to the high-frequency resonant lighting module so that a signal can be input and output, and that is operated so as not to light the high-frequency resonant lighting module A gas leakage detection module connected between the high-frequency resonant lighting module and the protection module so that signals can be input and output, and the gas leakage detection module is connected to the high-frequency resonant lighting module so that signals can be input and output A sensor that generates and outputs a detection signal according to a voltage difference caused by the high-frequency resonant lighting module. A filtering unit that is connected to the sense unit so that signals can be input and output, and filters and removes a frequency equal to or higher than a predetermined frequency in the detection signal from the sense unit, and the filtering unit and the protection module that allow signals to be input and output When the potential of the detection signal filtered and removed from the filtering unit is greater than or equal to a predetermined potential value, a control signal is generated and output to the protection module, and the protection module is activated to generate the high-frequency resonance. There is provided an electronic ballast including a controller that disables a lighting module and prevents a fluorescent lamp from lighting.

  In the electronic ballast, the high-frequency resonant lighting module includes an inductance element electrically connected to one end of the fluorescent lamp, the sense unit is configured by an induction coil, and the voltage generated by the inductance element is the induction coil. It is preferable to detect the difference and output the detection signal.

  In the electronic ballast, the control unit is electrically connected between a drive circuit that rectifies the filtered detection signal and outputs it as a drive potential, and the drive circuit and the protection module. It is preferable that the device includes a Zener diode that can be avalanche-conductive and can drive the protection module when the driving potential from is higher than a predetermined value.

  According to the electronic ballast of the present invention, it is possible to accurately detect that there is a gas leakage phenomenon by detecting a voltage difference greater than a predetermined value at both ends of the fluorescent lamp, the protection module is activated, and the high frequency resonant lighting circuit is Since the operation can be disabled, the fluorescent lamp can be prevented from being lit. Therefore, the voltage difference between both ends of the fluorescent lamp can be accurately detected, and the fluorescent lamp can be appropriately prevented from being turned on, so that the electronic ballast can be prevented from being destroyed and the use safety of the lighting device can be improved. Improvements can be made.

It is a circuit diagram of the electronic ballast concerning one embodiment by this invention used for a fluorescent lamp. The block diagram of FIG.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a circuit diagram of an electronic ballast according to an embodiment of the present invention used in a fluorescent lamp, and FIG. 2 is a block diagram of FIG. In the figure, Vdc is an external power source, 200 is an illumination facility connected to the external power source Vdc, such as a fluorescent lamp, and 100 is an electronic ballast connected to the external power source Vdc and electrically connected to the fluorescent lamp 200. In this example, although not shown, it is assumed that the electronic ballast 100 and the fluorescent lamp 200 are connected by a cord of 5 m or longer. The fluorescent lamp may be a general fluorescent lamp, and may be a T8, T5, or other standard lamp.

  The electronic ballast 100 is electrically connected to the fluorescent lamp 200 and operates so as to turn on the fluorescent lamp 200. The electronic ballast 100 is generally operated at a high frequency resonance lighting module 3, a gas leak detection module 4, and a protection module 5. including.

  The high-frequency resonant lighting module 3 is electrically connected to both ends of the fluorescent lamp 200, and includes, for example, a high-frequency half-bridge chip IC01 and transistors Q01 and Q02 so as to generate and oscillate a high-frequency voltage for lighting the fluorescent lamp 200. And an inductance element T01 electrically connected to one end of the fluorescent lamp 200. Since the high frequency resonant lighting circuit 3 has been widely used conventionally, detailed description thereof will be omitted.

  The protection module 5 is connected to the high-frequency resonance lighting module 3 so that signals can be input and output, and is operated so as to disable the high-frequency resonance lighting module 3 from operating. The configuration of the protection module 5 is conventionally known, and detailed description thereof is omitted here.

  The gas leak detection module 4 is connected between the high frequency resonant lighting module 3 and the protection module 5 so that signals can be input and output, and includes a sense unit 41, a filtering unit 42, and a control unit 43.

  The sense unit 41 is connected to the high-frequency resonant lighting module 3 so that signals can be input / output, and generates and outputs a detection signal according to the voltage difference of the fluorescent lamp 200 by the high-frequency resonant lighting module 3, for example, with an induction coil The voltage difference of the fluorescent lamp 200 by the inductance element T01 is detected by the induction coil.

  The filtering unit 42 is connected to the sense unit 41 so that a signal can be input and output, and is configured to filter and remove a frequency equal to or higher than a predetermined frequency in the detection signal from the sense unit 41. Specifically, the filtering unit 42 is composed of, for example, a low-pass filter including a resistor R01 and a capacitor C04. can do.

  The control unit 43 is connected between the filtering unit 42 and the protection module 5 so that signals can be input and output, and is controlled when the potential of the detection signal filtered out from the low-pass filter as the filtering unit 42 is equal to or higher than a predetermined potential value. A signal is generated and output to the protection module 5, and the protection module 5 is activated to disable the high-frequency resonance lighting module 3 so that it does not light up.

  In this example, the control unit 43 includes a drive circuit 431 connected between the filtering unit 42 and the protection module 5, and a Zener diode Z01 connected between the drive circuit 431 and the protection module 5 so that signals can be input and output. And a diode D03.

  The drive circuit 431 rectifies the filtered detection signal from the low-pass filter as the filtering unit 42 and outputs it as a drive potential. Here, by removing the high-frequency noise in the long-distance code by the filtering unit 42, interference due to the high-frequency noise can be eliminated, and generation of a surge in the drive potential output by rectifying the drive circuit 431 is avoided. Thus, the Zener diode Z01 can be prevented from operating erroneously.

  The Zener diode Z01 is avalanche-conductive when the drive potential from the drive circuit 431 is equal to or higher than the Zener voltage, for example. The diode D03 is turned on by the conduction of the Zener diode Z01, and the protection module 5 is driven by the drive potential from the drive circuit 431. In this example, the Zener voltage of the Zener diode Z01 is 15 volts, but the present invention is not limited to this.

  The protection module 5 is activated when a drive signal from the drive circuit is input through the conduction of the diodes Z01 and D03, grounds the high-frequency half-bridge chip IC01, stops driving the transistors Q01 and Q02, and the high-frequency resonant lighting module 3 Make it inoperable.

  The operation of the electronic ballast 100 configured as described above will be described below.

  The electronic ballast 100 of the present invention is attached to a lighting facility (not shown) and electrically connected to a remote fluorescent lamp 200 via a cord. When the power is turned on, the lighting equipment is activated, and the gas leak detection module 4 of the electronic ballast 100 detects the voltage difference between both ends of the fluorescent lamp 200 as needed through the inductance element T01. Here, when gas leakage does not occur in the fluorescent lamp 200, that is, when a voltage difference of a predetermined value or more is not detected, it is considered that the drive potential of the drive circuit 431 is lower than the Zener voltage of the Zener diode Z01, and the protection module 5 Is not activated, and the fluorescent lamp 200 is lit continuously.

  When the voltage difference between both ends of the fluorescent lamp 200 increases, the increased potential of the inductance element T01 is detected by the sense unit 41 and output as a detection signal. The filtering unit 42 filters out noise in the detection signal from the sense 41 and outputs the detection signal after the filtering process to the control unit 43.

  In the control unit 43, the drive circuit 431 rectifies the filtered detection signal from the low-pass filter as the filtering unit 42 and outputs it as a drive potential. If the drive potential is equal to or higher than the Zener voltage of the Zener diode Z01, the Zener diode Z01 is turned on and the diode D03 is turned on.

  When the diodes Z01 and D03 are turned on, the protection module 5 is activated, and the high frequency resonant lighting module 3 is disabled. Accordingly, the lighting of the fluorescent lamp 200 can be stopped, and the electronic ballast can be prevented from being destroyed.

  As described above, according to the electronic ballast of the present invention, it is possible to accurately detect a large voltage difference occurring at both ends of the fluorescent lamp 200, which seems to be due to gas leakage, and to stop the lighting of the fluorescent lamp 200. It is possible to avoid accidental electric shocks and to avoid the destruction of the electronic safety device. Therefore, it is possible to improve the use safety of the lighting equipment.

  The electronic ballast of the present invention is useful for lighting equipment that stops lighting of fluorescent lamps arranged at a long distance.

DESCRIPTION OF SYMBOLS 100 Electronic ballast 200 Fluorescent lamp 3 High frequency resonance lighting circuit 4 Gas leak detection module 41 Sense part 42 Filtration part 43 Control part 431 Drive circuit Z01 Zener diode 5 Protection module Vdc Power supply

Claims (3)

In an electronic ballast for lighting a fluorescent lamp arranged between a power source and a fluorescent lamp,
A high-frequency resonant lighting module that is electrically connected to both ends of the fluorescent lamp and oscillates by generating a high-frequency voltage for lighting the fluorescent lamp;
A protection module that is connected to the high-frequency resonant lighting module so that a signal can be input and output, and is operated so as not to light the high-frequency resonant lighting module;
A gas leakage detection module connected between the high-frequency resonant lighting module and the protection module so that a signal can be input and output, and
The gas leak detection module is
A sense unit that is connected to the high-frequency resonant lighting module so that a signal can be input and output, and generates and outputs a detection signal according to a voltage difference by the high-frequency resonant lighting module;
A filtering unit that is connected to the sense unit so that a signal can be input and output, and that filters out a frequency equal to or higher than a predetermined frequency in the detection signal from the sense unit;
A signal is connected between the filtering unit and the protection module so that a signal can be input / output, and when the potential of the detection signal filtered out from the filtering unit is equal to or higher than a predetermined potential value, a control signal is generated to the protection module. An electronic ballast, comprising: a controller for outputting and disabling the high-frequency resonant lighting module when the protection module is activated to prevent the fluorescent lamp from lighting. The high-frequency resonant lighting module has an inductance element electrically connected to one end of the fluorescent lamp,
2. The electronic ballast according to claim 1, wherein the sense unit includes an induction coil, and the induction coil detects a voltage difference due to the inductance element and outputs the detection signal. 3. The controller is
A drive circuit that rectifies the filtered detection signal and outputs it as a drive potential;
A zener diode electrically connected between the drive circuit and the protection module, wherein the Zener diode is avalanche-conductive when the drive potential from the drive circuit is equal to or higher than a predetermined value to drive the protection module; The electronic ballast according to claim 2, wherein:

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