Gas tube sign power supply midget








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Gas Tube Sign Power Supply

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As described above, the present invention prevents water drop formation on the surface of the neon tube and also the blackening phenomenon of the argon tube by controlling the oscillation frequency and duty cycle ratio in a gas-tube power supply apparatus for a neon tube or an argon tube. Water drop formation on the surface of the neon tube and also the blackening phenomenon of the argon tube are prevented by controlling the oscillation frequency and duty cycle ratio in a gas-tube power supply apparatus for a neon tube or an argon tube. A current detecting portion 16 constituted by diodes D 6 and D 7 is connected to one end of the primary side of the transformer HVT and one end of the first bridge diode BD 1. Switching mode power supply with protection function against overcurrent and overvoltage. In the power supply apparatus having such a structure according to the first embodiment of the present invention, when AC is applied and a predetermined AC is generated via transformer L 1 , the AC is rectified and smoothed into DC via a first bridge diode BD 1 , a resistor R 1 and a capacitor C 5. Also, the current detecting portion 16 for detecting the mount of current flowing in the primary side of the transformer HVT is provided so that operational stabilization of the high voltage output preventing portion 14 is achieved and simultaneously the circuit is simplified since the transformer T 1 is not needed in the high voltage transformer driving portion The signal output from an output port Q of the R-S flip-flop is amplified after passing through the buffer and applied to a primary side of the transformer T 1 via an output port OUT. A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein.. Description of the Related Art In a conventional power supply apparatus for a gas tube sign, power consumption increases due to a large amount of leakage current of a transformer and an electric shock or danger of fire occurs due to corona discharge during no load or shorts. When the trouble of the high-power output portion is sensed so that overcurrent flows therethrough, the current detecting portion detects it.

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Description: It should be understood that the present invention is not limited to the particular embodiment disclosed herein as the best mode contemplated for carrying out the present invention, but rather that the present invention is not limited to the specific embodiments described in this specification except as defined in the appended claims. Switching mode power supply with protection function against overcurrent and overvoltage. The resistors VR 1 and R 4 are for adjusting the oscillation frequency and duty cycle ratio and a capacitor CT connected to the diode D 1 is for adjusting the oscillation frequency. The second rectifying portion 10 of FIG. Accordingly, the second rectifying portion of FIG. Uninterruptible power supply based on non-invasive connection of backup circuit to switch power supply. First, when the electronic neon transformer is employed for a neon tube, a phenomenon occurs in which pea-shaped drops of water flow on a surface of the neon tube. Also, the following problems are caused in manufacturing an electronic neon transformer of a high voltage and high frequency type. For this reason, although the output of transformer L 1 of the first rectifying portion is unstable, the voltage is transformed by the transformer T 3 of the second rectifying portion 10 so that it is stabilized. A power supply apparatus as claimed in claim 4, further comprising an output safe returning portion, comprising diodes, a resistor and a capacitor, connected between an output port of said high voltage transformer driving portion and said switching means. Therefore, in order to overcome the problem casued due to the potential difference between the high and low voltages, the high-level GND potential and the low-level GND potential are completely separated. Also, the current detecting portion 16 for detecting the mount of current flowing in the primary side of the transformer HVT is provided so that operational stabilization of the high voltage output preventing portion 14 is achieved and simultaneously the circuit is simplified since the transformer T 1 is not needed in the high voltage transformer driving portion The signal output from an output port Q of the R-S flip-flop is amplified after passing through the buffer and applied to a primary side of the transformer T 1 via an output port OUT.
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