RU33284U1 - Electronic ballast for powering a discharge lamp - Google Patents

Description

The utility model relates to the field of electrical engineering and is intended for use in lighting devices equipped with gas discharge lamps with incandescent filaments fed by a high-frequency current.

Schematic diagram of an electronic ballast (ECG) for gas discharge lamps contains a rectifier designed to be connected to an alternating current source, a storage capacitor, an inverter and a ballasts (ballasts) (see M.I. Fugenfirov, Ballasts for fluorescent lamps. M., “Energy, 1971, p. 61, Fig. 25).

The closest analogue is a device for powering a gas discharge lamp according to the author's certificate of the USSR. No. 1751864 (IPC 5PO5 V 41/29, published July 30, 1992, Bull. No. 28). This device contains a rectifier, storage capacitor, ballasts

(PRA) and an electromagnetic choke connected in series in front of the rectifier to the power circuit.

The known device does not exhaust the possibilities of increasing efficiency and cos f, and also does not have the ability to operate lamps with faulty filaments, and electronic ballasts with high operational properties are complex and expensive. Therefore, the task solved by this utility model is to expand the arsenal of electronic ballasts in order to ensure high performance of these products with a minimum of simple and reliable tools, informing them of new functions, relationships and refined parameters.

The problem is solved as follows.

An electronic ballast circuit for supplying a gas discharge lamp with incandescent filaments, comprising a rectifier, an accumulating capacitor, an inverter, a ballasts (PRA) and an electromagnetic inductor in series with the electronic ballast in front of the rectifier, which, in accordance with this utility model, has reactive power within from 50 to 100 percent of the active power of the load, and in the power circuit parallel to the input of the rectifier and after the electromagnetic inductor

a capacitor is included, the reactive power of which is at least 20 percent of the active load power. At the same time, the resonance circuit includes a resonant circuit for increasing the voltage on the lamp with faulty filaments until it returns to normal operation.

Solving the task with the totality

the minimum number of interconnected elements of electronic ballasts ensures efficiency and cos f close to unity, as well as the necessary filtering of mains energy, voltage stabilization and operation of discharge lamps with faulty filament.

As a result of solving the problem, the arsenal of electronic ballasts has been expanded, which have high operational properties, wide functionality with extreme simplicity of design.

The drawing shows a schematic diagram of electronic ballasts.

The electronic ballast contains an electromagnetic inductor Dr 1, capacitor C1, a rectifier, a smoothing capacitor C2, an inverter and a ballast (PRA), which includes a reactor Dr 2, a capacitor C3, designed to

parallel connection to the discharge lamp Гл, and capacitor C4, designed for parallel connection to the filament of the lamp Гл.

Electronic ballast apparatus operates as follows.

When the electronic ballast is connected to the network, an alternating current of a given frequency, passing through the inductor Dr1, is phase shifted, providing an increase in efficiency and power factor, is rectified by a rectifier and charges the storage capacitor C2. The inverter converts the constant voltage of the capacitor C2 to the voltage of the required high frequency, which, through the ballast, ensures the inclusion of the gas discharge lamp HL and its output to normal operating mode.

If the filament of the gas-discharge lamp Гл is faulty, the voltage on it rises until it reaches its normal operating mode due to the voltage resonance, which is provided, for example, by the resonant ballast circuit due to a decrease in the total capacitance of SZ and C4 connected to each other in parallel and in series with the inductor Др2 due to the disconnection of the capacitor C4 in case of breakage or combustion of at least one filament.

The increase in the load current from the network is smoothed out by the inductor Dr1.

The inclusion of capacitor C1 provides an increase in the voltage at the input of the rectifier due to the resonance of the voltages in the series circuit of the inductor Др1 and capacitor C2 to the source of an alternating mains voltage, which leads to an additional increase in efficiency and correction of the coefficient of loss, and a decrease in the level of radio noise.

Electronic ballasts can be implemented by available technical means. Its industrial applicability is confirmed experimentally.

Applicants: V. Chernichkov 04/05/03 Tuniev A.A. 5.04.03 / Lazarev A.G. 04/05/03

Claims (1)

An electronic ballast for feeding a gas discharge lamp with filament, containing a rectifier, a storage capacitor, an inverter and a ballast (PRA) and an electromagnetic inductor in series with the electronic ballast in front of the rectifier, characterized in that said electromagnetic inductor has a reactive power of in the range from 50 to 100% of the active power of the load, and in parallel to the input of the rectifier and after the electromagnetic inductor, a capacitor is turned on, the reactive power to it is at least 20% of the active load power, while the ballast circuit includes a resonant circuit to increase the voltage on a gas discharge lamp with faulty filament until it enters its normal operating mode.