Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1983-02-07
1985-12-31
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315DIG5, 315DIG7, 315227R, 315307, 323222, 323226, H05B 3702, H05B 3904, H05B 4136
Patent
active
045623830
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an inverter with a rectifier which is powered by an alternating-current (AC) voltage supply, and which delivers substantially a half-wave rectified voltage. A charging regulator is provided incorporating a charging condenser connected through a charging diode and a charging inductor to the rectifier, as well as a charging switch which is periodically closed by a control component with a variable keying ratio to connect the charging inductor to the rectifier. The inverter includes an AC voltage converter with two alternatingly controlled switches supplied with power by the charging condenser, hereafter identified as the primary switch and the secondary switch, which are in a series circuit in parallel with the charging condenser. In this arrangement the switching frequency of the charging switch and also of the AC voltage converter are higher than the frequency of the AC voltage supply.
2. Discussion Of The Prior Art
An inverter of this type is described in U.S. Pat. No. 4,251,752, incorporated herein by reference, in which the keying ratio for control of the charging switch is determined by a regulator which has the half-wave voltage of the rectifier coupled thereto as a reference value. This occurs, however, in a relatively complicated circuit.
In such a circuit the charging regulator should be deactivated when no energy is withdrawn from the charging condenser, for example, during non-oscillating periods of the alternating voltage converter.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to simplify the control of the charging switch in an inverter of the above-mentioned type; in particular, a design is provided such that the charging regulator will automatically switch off at a non-oscillating condition of the alternating voltage converter and operate with as low a loss as possible.
The foregoing object is achieved by the invention as described herein for an inverter of this type in that the control component for the charging switch of the charging regulator is synchronized with the square wave voltage at one of the switches of the alternating voltage converter.
Thus, in accordance with the present invention, the charging switch operates at the same switching frequency as the alternating voltage converter, and the control voltage for the charging switch, for example, across a capacitative voltage divider, is taken from the square-wave voltage at a switch of the alternating voltage converter. When this voltage terminates during a non-oscillating condition of the alternating voltage converter, then the charging switch of the charging regulator also remains open. At a disruption, accordingly only the alternating voltage converter need be deactivated.
The keying ratio of the actuation switching period of the charging switch relative to the total period interval determines the voltage on the charging condenser and also has an effect on the waveform of the supply current. This keying ratio is preferably determined by the charging period of a delay storage element, particularly a delay condenser. The charging or discharging circuit associated with the condenser includes one of the switches of the alternating current voltage converter for synchronizing.
Pursuant to a first embodiment of the present invention, the actuation period of the charging switch extends to the end of the square-wave voltage on one of the switches of the alternating voltage converter, and its commencement is determined through the end of the charging period of the delay storage element at a response value which begins with the commencement of the above square-wave voltage. The actuation period is thus smaller than the half period interval by the charge period of the delay storage element.
With the prerequisite that the mean voltage on the charging condenser should be only slightly larger than the peak value of the half-wave voltage of the rectifier, the discharge voltage (difference between the voltages on the chargin
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patent: 3611021 (1971-10-01), Wallace
patent: 3896336 (1975-07-01), Schreiner et al.
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patent: 3999100 (1976-12-01), Dendy et al.
patent: 4042856 (1977-08-01), Steigerwald
patent: 4188661 (1980-02-01), Bower et al.
patent: 4199710 (1980-04-01), Knoll
patent: 4251752 (1981-02-01), Stolz
patent: 4392085 (1983-07-01), Knoll et al.
Kerscher Max
Kroning Armin
Chatmon Saxfield
Siemens Aktiengesellschaft
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