H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/27, 321/89
H02M 3/337 (2006.01) H03K 17/687 (2006.01) H02M 7/538 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 1297533
ABSTRACT OF THE DISCLOSURE A voltage converter (100) converts a high voltage, low frequency input (120 volts at 60 Hz) to a low D.C. voltage output (0-30 volts). The voltage converter (100) initiallly rectifies the input to provide an intermediate high level D.C. voltage which facilitates operation of an oscillator (202) at a frequency of 25 KHz. A pair of MOSFETS (124 and 126) are alternately switched into operation at the 25 KHz frequency. Upon operation of MOSFET (124), the intermediate D.C. voltage functions as a first power source which is applied across and directs current in one direction through a primary winding (132) of a high frequency step-down transformer (134) and also charges a series-connected capacitor (152). Upon operation of MOSFET (126), capacitor (152) functions as a second power source which discharges to provide current through primary winding (132) in the opposite direction. Thus, the alternately switched operation of MOSFETS (124) and (126) in this manner facilitates the application of an alternating voltage at the frequency of 25 KHz which is stepped down to a secondary winding (142) of transformer (134) and is then rectified to provide the low D.C. voltage output of voltage converter (100). A pair of diodes (120 and 122) are provided to prevent undesirable oscillations from occurring within voltage converter (100) if a short should occur in any load connected to the output of the converter. In one embodiment (FIG. 4), a multivibrator (308) is controlled to turn off oscillator (202) in response to undesirable wide swings in the voltage of capacitor (152) resulting from an overload in the load to terminate operation of voltage converter (100). In other embodiments, a second capacitor (220 or 408) is charged simltaneously with capacitor (152) and functions as a third power source to bias the MOSFET (126) on when MOSFET (124) is off. A power buffer (600) is used to convert D.C. power to A.C. power at a prescribed output voltage and frequency. 3903P
590690
Black & Decker Inc.
Gowling Lafleur Henderson Llp
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