KR100523406B1 - A limited time illumination keep curcuit a time of switch off - Google Patents

Abstract

The present invention relates to a ballast of the lamp, the lamp is not immediately turned off when the power is cut off and maintains a low light condition (or the original illuminance state) for a certain time after a certain time low light maintenance circuit when the manual switch-off It is about.

According to the present invention, when the user turns off the manual on / off switch unit 11 while leaving the house or leaving the office, the capacitor C100, which was charged by the partial pressure of the resistors R100 and R101 at the time of switching on, is discharged and the FET is discharged. Since Q3 is off and FET Q4 is on to lower the voltage of pin 1 time constants of capacitor C11 and oscillation IC IC2 to control the frequency, lamp L is illuminated by the controlled frequency. Is maintained in a clouded state, but when the gate voltage of the FET Q100 gradually falls due to the discharge of the capacitor C101 and the resistor R103, the gate is turned off after a certain time, and thus the relay contact, the auxiliary power on / off switch 16, is turned on. Since this is switched from a to b, the ballast power is cut off and the lamp L is completely turned off.

Description

A limited time illumination keep curcuit a time of switch off}

The present invention relates to a ballast of a lamp, and in particular, so that the lamp is not immediately turned off when the power is cut off so that it can be completely turned off after maintaining a low light state (or original illuminance state) for a predetermined time.

In general, a fluorescent lamp is a kind of discharge tube, and a high voltage is required initially to emit hot electrons required for discharge, and the voltage applied to the fluorescent lamp after discharge has a negative resistance characteristic that decreases as the lamp current increases.

Therefore, the lighting may become unstable due to the negative resistance characteristic or the lamp itself may be broken.

That is, the ballast initially supplies a high voltage necessary for lighting to turn on the lamp, and after lighting, serves to maintain a constant brightness by controlling the current of the lamp.

The electronic circuit composed of semiconductor components and passive electronic components is used to convert AC 50 ㎐ / 60 전원 to high frequency (20 ㎑ to 100 ㎑) using a frequency conversion circuit, and then use the lamp as a lamp power source.

Therefore, the electronic ballast improves luminous efficiency by about 15% compared with the magnetic ballast, and the semiconductor device reduces the loss due to self-heating by about 25% due to the use of semiconductor devices. More than% power savings can be achieved.

In general, when the fluorescent lamp is switched off in the home or office, the power is cut off immediately and the fluorescent lamp is turned off.

Therefore, when the power is turned off while leaving the house or office, the fluorescent lamp is turned off immediately, so if you forget something for a while and enter the house or office again, there was a defect that the fluorescent lamp should be turned on again.

The present invention is to solve the conventional problems as described above, the object of the present invention, by turning off the power while leaving the house or office lamps such as fluorescent lamps are not turned off immediately after being turned off after maintaining a low light for a certain time The present invention provides a low-light maintaining circuit for a predetermined time during manual switch-off to maintain a certain degree of indoor brightness in a house or office even when the power is cut off.

The present invention for achieving the above object is to rectify and smooth the input AC power is converted into a DC voltage EMI filter and rectification smoothing unit, connected to the output terminal of the EMI filter and rectifying smoothing unit by a capacitor and an inductor inside the ballast A power factor correction unit for correcting the distorted power factor and harmonics, an oscillation and inverter drive unit for generating and driving a signal for switching an inverter output through the power factor correction unit, and an input terminal of the oscillation and inverter drive unit, and a lamp Soft preheating control unit to reduce the preheat peak pressure generated excessively by the frequency control, to extend the lamp on / off life, inverter switching unit for converting the DC voltage output from the oscillation and inverter drive unit into a high-frequency square wave LC resonance is connected to the output terminal of the inverter switching unit Lamp output unit for supplying a high frequency AC current formed by the lamp to the lamp stably, the protection circuit unit to detect the over-current flow over the lamp failure and output of the lamp output unit to stop the ballast to protect the ballast, the AC input terminal It is connected between and the soft preheating control unit is characterized in that it comprises a low light maintaining unit that detects this when the AC power is cut off to control the oscillation frequency to maintain a low light for a predetermined time and then turn off the power.

In addition, the present invention includes two switching elements in which the low light maintaining unit is operated opposite to each other, a frequency crystal capacitor connected to pin 1 of the oscillation IC, and a plurality of resistors and capacitors connected to the two switching elements. In addition, the present invention provides the above-described time delay unit comprising: a capacitor in which charge is charged at power-on, a resistor for discharging the capacitor, a switching element connected to each side of the capacitor and the resistor; It is characterized in that it comprises a relay coil operated in accordance with the on / off of the switching element. Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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1 is an overall block diagram of the present invention, which is provided with an EMI filter and a rectifying smoothing unit (1) for rectifying and smoothing an input AC power and converting it into a DC voltage. Do not let the generated noise leak out.

In addition, a power factor correction unit 2 is connected to an output terminal of the EMI filter and the rectification smoothing unit 1 to correct power factor and harmonics distorted by a capacitor and an inductor inside the ballast.

In addition, the output terminal of the power factor correcting unit 2 is provided with an oscillation and inverter drive unit 3 for generating and driving a signal for switching the inverter.

And it is connected to the input terminal of the oscillation and inverter drive unit 3, soft preheating to extend the lamp on / off life by reducing the preheat peak voltage generated excessively when the lamp (L) is lit by frequency control A control unit 4 is provided, and an inverter switching unit 5 for converting the DC voltage output from the oscillation and inverter drive unit 3 into a square wave of high frequency.

In addition, the lamp output unit 7 is connected to the output terminal of the inverter switching unit 5 to stably supply the high frequency AC current formed by L-C resonance to the lamp L.

In addition, the output terminal of the lamp output unit 7 is provided with a protection circuit unit 6 which detects when an overcurrent flows due to a lamp failure and an output abnormality, stops the ballast operation, and protects the ballast. 4) Between when the AC power is cut off, it controls the oscillation frequency to maintain a low light for a predetermined time, and is provided with a low light maintaining unit 8 to turn off the power.

FIG. 2 is a detailed block diagram of the low light maintaining unit 8 and includes a manual switch on / off detection unit 12 for detecting on / off of the manual on / off switch unit 11 and the manual on. The output level of the on / off switch detector 11 is provided with a voltage level detector 13 for detecting the input voltage level.

In addition, an output terminal of the voltage level sensing unit 13 is provided with an illumination control unit 14 for controlling the illumination according to the voltage sensing, the auxiliary power supply in accordance with the voltage level detected by the voltage level sensing unit 13 An auxiliary power switch on / off and delay controller 15 for delaying and controlling the on / off of the switch for a predetermined time is provided.

In addition, the output terminal of the auxiliary power switch on / off and delay control unit 15 is provided with an auxiliary power on / off switch unit 16 for turning on / off the auxiliary power. The off switch unit 16 is configured to include relay contacts a and b operated in conjunction with the relay coil CO.

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The operation of the present invention configured as described above will be described with reference to FIG. 3, which is a detailed circuit diagram.

First, the lamp L is turned on by turning on the manual on / off switch 11 which is usually installed in a wall of a home or an office.

That is, when the AC power is input to the ballast when the manual on / off switch 11 is turned on, the AC power is rectified and smoothed through the EMI filter and the rectifying smoothing unit 1 to be converted into DC power.

Further, the power factor and harmonics distorted by the capacitor and the inductor inside the ballast are corrected through the power factor correcting unit 2.

In addition, since a signal for switching the inverter is generated through the oscillation and the inverter drive unit 3, the inverter switching unit 5 is switched so that the DC voltage rectified and smoothed through the EMI filter and the rectifying smoothing unit 1 has a high frequency. Are converted to square waves.

In addition, the lamp output unit 7 connected to the output terminal of the inverter switching unit 5 supplies a high frequency AC current formed by LC resonance to the lamp stably, and a protection circuit unit 6 at the output terminal of the lamp output unit 7. ), It detects when over current flows in case of lamp failure and output abnormality, and stops ballast operation.

On the other hand, the soft preheating control section 4 reduces the preheat peak voltage generated excessively when the lamp is turned on by the frequency control to extend the life of the lamp L.

As described above, when the manual on / off switch unit 11 is turned on, the voltage level of the switch is sensed through the manual switch on / off detector 12 and the voltage level detector 13, and the resistors R100 and R101 are used. The divided voltage is rectified and smoothed by the diode D101 and the condenser C100 to form a DC voltage level.

In addition, referring to the operation of the auxiliary power switch on / off and delay control unit 15, when the capacitor (C100) is charged and the voltage flows when the voltage level is equal to or higher than the zener voltage of the zener diode (Z100), the capacitor (C101) is charged. When the FET Q100 is turned on and the current induced on the secondary side of the choke transformer is rectified and smoothed by the diode D102 and the capacitor C102, the relay is operated when the relay operation power is supplied, and the contact is connected to a. Becomes

In addition, when the capacitor C100 is charged and the zener diode Z101 is equal to or higher than the zener voltage, current flows to charge the capacitor C14, the FET Q3 is turned on, and the FET Q4 gate voltage is lowered. (Q4) is turned off.

Therefore, when the FET Q4 is in the on state, the oscillation and the inverter drive unit 3 operate at a frequency higher than the normal frequency to preheat the lamp, and when the operation of the FET Q4 is turned off by the FET Q3, the oscillation and The inverter drive section 3 is converted to a normal frequency and the lamp L is normally turned on.

On the other hand, when the user turns off the manual on / off switch unit 11 while leaving home or leaving the office, the voltage level is lowered as opposed to the time of switching on as described above.

Therefore, when the capacitor C100, which was charged by the partial voltage of the resistors R100 and R101, is discharged, the FET Q3 is turned off and the FET Q4 is turned on so that the voltage of the capacitor C11 and the IC pin 1 time constant is turned on. Since the frequency is controlled by decreasing the frequency of the lamp, the lamp maintains the illumination level blurred by the controlled frequency, but when the gate voltage of the FET Q100 is gradually dropped by the discharge of the capacitor C101 and the resistor R103, the relay coil is turned off. Since no power is induced to CO, the relay contact, which is the auxiliary power on / off switch 16, is switched from a to b so that the lamp L is completely turned off. On the other hand, the illuminance lower than the original illuminance is maintained. Although the process for doing this has been described, the present invention is not limited thereto, and may be turned on for a predetermined time with the same illumination as the original illumination.

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The present invention as described in detail above, when the power is turned off, the lamp is not immediately turned off and maintains a low light state (originally lit state) for a predetermined time, and then turns off the lamp even after entering the home or office again after the lamp is turned off. Even if you do not have a certain amount of lighting is maintained in the room for a certain time, you can see what you need, as well as do not need to switch on again, there is a beneficial effect such as saving power.

1 is an overall block diagram of the present invention.

2 is a block diagram for illuminance and time delay control of the present invention;

3 is a detailed circuit diagram of the present invention.

<Explanation of symbols for main parts of drawing>

1: EMI filter and rectification smoother 2: Power factor correction

3: Oscillation and inverter driver part 4: Soft preheating control part

5: inverter switching part 6: protection circuit part

7: Lamp output section 8: Low light holding section

11: Manual on / off switch part 12: Manual switch on / off detection part

13: voltage level detection unit 14: illuminance control unit

15: Auxiliary power switch on / off and delay control

Claims (2)

EMI filter and rectification smoothing unit for rectifying and smoothing the input AC power to DC voltage, and connected to the output terminal of the EMI filter and rectifying smoothing unit to correct the power factor and harmonics distorted by the capacitor and inductor inside the ballast. Pre-heating is connected to a power factor corrector, an oscillation and inverter drive unit for generating and driving a signal for switching an inverter output through the power factor correction unit, and an input terminal of the oscillation and inverter drive unit and is excessively generated when a lamp is turned on. Soft preheating control unit for reducing peak pressure by frequency control and extending lamp on / off life, inverter switching unit for converting DC voltage output from the oscillation and inverter drive unit into high frequency square wave, and inverter switching unit Connected to the output terminal to generate high frequency AC current In a circuit comprising a lamp output unit for stably supplying the lamp, and a protection circuit unit for detecting the occurrence of overcurrent beyond the lamp failure and output of the lamp output unit to stop the ballast operation to protect the ballast, Connected between the AC input terminal and the soft preheating control unit detects this when the manual switch-off, and controls the oscillation frequency to maintain the low light for a predetermined time, the power is characterized in that it comprises a low light maintenance and time natural part to turn off the power Constant time low-light maintenance circuit. The method of claim 1, wherein the low light maintenance and time delay unit, A low light maintaining unit including two switching elements operated opposite to each other, a frequency determining capacitor connected to pin 1 of the oscillation IC, Including a capacitor for charging the charge when the power is turned on, a resistor for discharging the capacitor, a switching element connected to each side of the capacitor and the resistor, a time delay unit including a relay coil operated in accordance with the on / off of the switch element Low light maintaining circuit for a predetermined time when the manual switch off, characterized in that configured.