DC power supply with electronically controlled power dissipation

Details DC power supply with electronically controlled power dissipation DC power supply with electronically controlled power dissipation

1987-07-09

1988-09-13

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 86, H02P 1326

Patent

active

047713739

ABSTRACT:
A supply circuit for supplying a smoothed direct current to a load comprises a series FET element in series with the load resistance. The supply circuit is fed from the AC supply network via a rectifier 54 and a smoothing capacitor 52 causing a ripple voltage to be present on the input terminals 2-1 and 2-2. The direct voltage component of the input voltage is present across load resistance 60 and the alternating voltage component of the input voltage is present across transistor 10. In the case of known supply voltage circuits the voltage drop across the series element is selected to be equal to the maximum peak-to-peak value of the alternating voltage component thereby causing unnecessary power dissipation to be developed at a minor ripple amplitude. This will cause rapid ageing of the series element. The supply circuit in accordance with the invention comprises a comparator 42 comparing the voltage across FET transistor 10 to a threshold voltage. Comparator 42 controls the charge on the filter capacitors 30 and 32. Consequently, the overall voltage across transistor 10 will never exceed the sum of the threshold voltage and the peak-to-peak voltage of the alternating voltage component of the input voltage.

REFERENCES:
patent: 3226630 (1965-12-01), Lampke
patent: 3354380 (1967-11-01), Fly et al.
patent: 4127895 (1978-11-01), Krueger
patent: 4341990 (1982-07-01), Davis
patent: 4473784 (1984-09-01), Morez
patent: 4685046 (1987-08-01), Sanders

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