Overload-limiting method based on the PWM (or LC3) control techn

Details Overload-limiting method based on the PWM (or LC3) control techn Overload-limiting method based on the PWM (or LC3) control techn

1991-05-14

1992-11-03

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 10, 361 58, 361 90, H02H 700, H02H 320

Patent

active

051610825

ABSTRACT:
The present invention relates to an overload-limiting method and circuit based on the PWM control technique. An overload-limiting induction coil is kept short circuited until a maximum value of a magnitude that is a function of the current flowing through the load is detected. The induction coil is put into circuit only after the maximum value of said magnitude has been detected and it is kept in circuit until a minimum value of said magnitude is detected. The magnitude may be constituted by the current flowing through the load or by the voltage across the terminals of the load. The means for short circuiting and inserting the induction coil comprise a transformer whose primary winding is constituted by the induction coil and whose secondary winding is in circuit with an electronic switch constituted by a full-wave electronic rectifier controlled by a comparator. The invention is applicable to the electronics industry.

REFERENCES:
patent: 1696177 (1928-12-01), Evans
patent: 4070699 (1978-01-01), Einbinder
patent: 4184186 (1980-01-01), Barkan
patent: 4309734 (1982-01-01), Warren
patent: 4366389 (1982-12-01), Hussey
Bo Tonnquist: "Current Limit Module for Power Distribution in Transient Sensitive Systems"; International Telecommunications Energy Conference, Oct. 1986, Toronto pp. 403-408, Figure 8.

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