Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural periodic switches or multiple contact periodic switch
Patent
1986-10-02
1988-02-16
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Plural periodic switches or multiple contact periodic switch
315283, 315307, 315244, 363 17, 363 58, H05B 3702, H05B 3904, H05B 4136
Patent
active
047257628
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a circuit supplied with direct voltage for generating voltages and/or currents with different curve forms and/or different frequencies and/or different polarities, with at least one load.
2. Description of Related Art
In many technological and research fields, it is essential and important to have available voltages and currents which are controllable within wide limits, as far as their magnitude and their progression as a function of time is concerned. Without any claims of completeness, several application areas are enumerated here: regulation of DC current motors with reversible directions of rotation; regulation of alternating current motors as far as their rpm and directions of rotation are concerned; low frequency currents or voltages for research and investigation work, for instance in the biological field; direct current supplies for gas discharge lamps and their brightness regulation; testing of electrical apparatus with complex resistance behavior over wide frequency ranges and more of the same.
SUMMARY OF THE INVENTION
An object of the invention is to develop a circuit proceeding from a direct voltage supply, with which the solution of the task is possible. The invention is characterized by a choke coil arranged in series with this load and at least two controlled semiconductor switches, which each lie in a series circuit as far as the load and the choke coil are concerned. However, these two switches lie in different current paths and these current paths are connected at differing potentials of the supply voltage, wherein, in actual operation, one switch is held open while the other switch is opened and closed in alternating sequence, and, after the termination of an adjustable or selectable time period the switch which has hitherto been actuated in alternating sequence (clock pulse frequency) is kept open, while the hitherto held open switch is, in alternating sequence, opened and closed, this alternating sequence of switch actuation (polarity reversal frequency) being continuously repeated. With such a circuit according to the invention, voltages and currents of whatever progression can be produced at a load. The respective continuous on and off switching of one of the semiconductor switches provided in pairs is designated as the clock pulse frequency herein while the alternating sequence of putting into operation of the two semiconductor switches provided in pairs is designated as the polarity reversal frequency.
A particularly simple circuit of this type is characterized in accordance with a feature of the invention by the current path containing the load and the choke in series arrangement being connected at an average value of the supply voltage. With such a circuit, currents and voltages of very low frequency (lower than 20 Hertz) can be obtained without requiring any particular switching complications, however the output which can be handled by this circuit is limited.
An additional circuit of this type also suitable for low outputs and particularly low frequencies is characterized, in accordance with an additional feature of the invention, by the current path containing the load and the choke in series arrangement being connected at different potentials of the supply voltage through at least two condensers, which each lie in series, as far as the load and the choke coil are concerned, but which, however, lie in different current paths, wherein the condensers are connected at the same potentials of the supply voltage as the controlled semiconductor switches.
Another circuit, which satisfies all requirements as far as the output and variation possibilities are concerned, is characterized, in accordance with an additional feature of the invention, in that the current path containing the load and the choke in series arrangement is connected at differing potentials of the supply voltage through two additional controllable semiconductor switches, which each lie in series arrangement with respect to the loa
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"IEEE Transactions on Industrial Electronics", vol. IE-30, No. 1, Feb. 1983, New York, N.Y. U.S.A.: article by T. K. M. Babu et al., Evaluation of Single-Phase PWM Inverter Performance, p. 61, right column, paragraphs 1,2,5; FIG. 1.
Chatmon Saxfield
Zumtobel Aktiengesellschaft
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