Current limited for constant current for switching driving devic

Details Current limited for constant current for switching driving devic Current limited for constant current for switching driving devic

1987-04-09

1988-02-16

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 361 18, G05F 1573

Patent

active

047257695

ABSTRACT:
The switching driving device with current limitation, operating reliably even with high switching frequencies, comprises a drive stage receiving at the input a timing clock signal at a preset frequency and generating at the output a drive signal synchronized with the timing clock signal, a power element connected at the input to the drive stage, receiving therefrom the drive signal and generating a load supply signal, a load fed by the power element, and a current sensor generating an overload signal when the current in the load has reached a preset threshold. The current limitation is obtained through a memory element connected to the current sensor and disabling the drive stage in the presence of the overload signal. In order to obtain a reliable operation, in the presence of the overload signal the drive stage is controlled at a switching frequency which is lower than the preset frequency of the timing clock signal.

REFERENCES:
patent: 3818306 (1974-06-01), Marini
patent: 3970919 (1976-07-01), Butcher
patent: 3978393 (1976-08-01), Wisner et al.
patent: 4309650 (1982-01-01), Boros et al.
patent: 4438473 (1984-03-01), Cawley et al.
Faulkenberry, "Low Cost Timers Govern Switched-Mode Regulator", Electronics, vol. 53, No. 27, Dec. 18, 1980, p. 97.

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