Power supply for solid state lasers
A compound converter was developed to get low voltage (2.5V) out and high current (l0A) out. The buck converter used Pulse Width Modulation (PWM). The PWM control function was contained in the UC3827N-1 controller chip. A voltage feedback loop was used to control the duty cycle of the buck to produce a desired output voltage. A push-pull operation followed the buck operation for high frequency. The design specifications were: • Input voltage = 50V • Output voltage = 2.5V • Output current = l0A • Switching frequency = 50kHz Two PC boards were designed. One had a 175mil output trace and was tested for 5A current output. The other one had a 500mil output trace and was tested for l0A current output. Two types of transformers were designed, one used the core of P36/22 and the other used the core of P30/19.