SWITCHING POWER SUPPLY
First Claim
1. A buck-boost switching power supply including an H bridge converter at an input stage having a high side switch and a low side switch connected in series via a choke coil,wherein the high side switch is turned ON and the low side switch is turned ON and OFF when an absolute value of an instantaneous value of an input voltage is lower than an output voltage, and the high side switch and the low side switch are simultaneously turned ON or OFF to put the current of the choke coil in a critical mode when the absolute value of the instantaneous value of the input voltage is higher than the output voltage, thus controlling power factor correction.
1 Assignment
0 Petitions
Accused Products
Abstract
A buck-boost converter of an H bridge type having a function for initially charging a smoothing output capacitor without a relay and a rush current preventing resistance. A compact and flat power supply is attained by employing a current critical mode H bridge system for a PFC converter and providing a function of initially charging a smoothing output capacitor to a converter circuit.
51 Citations
11 Claims
-
1. A buck-boost switching power supply including an H bridge converter at an input stage having a high side switch and a low side switch connected in series via a choke coil,
wherein the high side switch is turned ON and the low side switch is turned ON and OFF when an absolute value of an instantaneous value of an input voltage is lower than an output voltage, and the high side switch and the low side switch are simultaneously turned ON or OFF to put the current of the choke coil in a critical mode when the absolute value of the instantaneous value of the input voltage is higher than the output voltage, thus controlling power factor correction.
- 6. A buck-boost switching power supply wherein a semiconductor switching element and a choke coil used for control of power factor correction cause a current peak value of the smoothing output capacitor in the initial charge mode to be controllably made constant.
Specification