G - Physics – 05 – F
Patent
G - Physics
05
F
323/4
G05F 1/44 (2006.01) H02M 3/335 (2006.01) H02M 3/337 (2006.01)
Patent
CA 1202075
MULTIPLE OUTPUT VOLTAGE SWITCHING POWER SUPPLY Abstract A multi-voltage switching power supply having a first pair of switches connected in series with each other across a pair of incoming power lines. The switches are alternately closed at a fifty percent duty cycle. A plurality of pairs of series-connected switches are also connected between the incom- ing power lines and operated in a pulse-width modulated mode. Power supply circuits are connected between the junction of the pulse-width modulated switches of each pair and the junction of the fifty percent duty cycle switches. The peak value of the current applied to the power supply circuit, which determines the power supply output voltage, is controlled by adjusting the closure time of the pulse-width modulated switches. However, the pulse-width modulated switches are synchronized to the operation of the fifty percent duty cycle switches so that all correspondingly connected, pulse-width modulated switches are closed only when the fifty percent duty cycle switch connected to the opposite incoming line is closed if the fifty percent duty cycle switches are running. Thus, all pairs of pulse-width modulated switches share the same fifty percent duty cycle switches. The switches are solid-state devices which inherently have an internal shunt capacitance. This capacitance allows current to flow through the switch even when the switch is not closed. As a result, under no-load conditions the output volt- age can rise in an uncontrolled manner. An uncontrolled in- crease in the output voltage is thus detected and used to alter the operation of the pulse-width modulation control circuitry to cause the pulse-width modulated switches corresponding to that power supply to open and close at the same time as the corre- spondingly connected fifty percent duty cycle switches. As a result, the voltage applied to the power supply circuit is always zero.
433885
Carpenter Ralph F.
Gordon David R.
Frayne & Company Robert
Pacific Electro Dynamics Inc.
LandOfFree
Multiple output voltage switching power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple output voltage switching power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple output voltage switching power supply will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1258592