초록 ▼

A bi-directional boost circuit for power factor correction includes a power factor control circuit and a pair of diodes, a pair of inductors, and a pair of switches. A first diode, a second diode, a first inductor, a second inductor, a first switch, and a second switch convert the AC input voltage,

A bi-directional boost circuit for power factor correction includes a power factor control circuit and a pair of diodes, a pair of inductors, and a pair of switches. A first diode, a second diode, a first inductor, a second inductor, a first switch, and a second switch convert the AC input voltage, rectify the AC input voltage, and output an intermediate DC voltage. The power factor control circuit receives the AC input voltage and receives the intermediate DC voltage. The power factor control circuit regulates the DC output voltage. Based on the AC input voltage and the intermediate DC output voltage, the power factor control circuit controls an inductor current waveform by driving the first switch and the second switch to create a substantially sinusoidal current as seen by the power source that is in phase with the AC input voltage.

대표청구항 ▼

What is claimed is: 1. A bi-directional boost circuit for power factor correction, comprising: a first diode, a second diode, a first inductor, a second inductor, a first switch, and a second switch to convert an AC input voltage, rectify the AC input voltage, and output an intermediate DC voltage;

What is claimed is: 1. A bi-directional boost circuit for power factor correction, comprising: a first diode, a second diode, a first inductor, a second inductor, a first switch, and a second switch to convert an AC input voltage, rectify the AC input voltage, and output an intermediate DC voltage; and a power factor control circuit, the power factor circuit including a waveform generator to receive the AC input voltage and generate a haversign waveform; a pulse width modulator to generate a pulsed signal based on the intermediate DC voltage; a multiplier to multiply the haversign waveform and the pulsed signal and to create a multiplied haversign signal; an integrator to strip off high frequency characteristics of the multiplied haversign signal to create a haversign signal; a first control circuit to compare a magnitude of the haversign signal to a magnitude of a first inductor current to generate a first drive signal; and a second control circuit to compare a magnitude of the haversign signal to a magnitude of a second inductor current to generate a second drive signal, which controls an inductor current waveform to form a substantially sinusoidal waveform that is in phase with the AC input voltage. 2. The circuit of claim 1, wherein the power factor control circuit creates a clipped inductor current waveform if the power factor control circuit is configured with a clipping threshold value and a value of an inductor current is above the clipping threshold value. 3. The circuit of claim 1, wherein the first control circuit is a first current mode controller and the second control circuit is a second current mode controller. 4. The circuit of claim 1, further including an error amplifier to compare a reference voltage and the intermediate DC voltage and to generate an error signal and to input the error signal to the pulse width modulator to control a pulse width of the pulsed signal. 5. The circuit of claim 1, further including a comparator to clamp the haversign signal in response to a large instantaneous change in the intermediate DC output voltage. 6. A method of power factor correction, comprising: receiving an AC input voltage; generating an intermediate DC voltage; generating, at a waveform generator, a haversign waveform; generating a pulsed signal based on the intermediate DC voltage; multiplying the haversign waveform and the pulsed signal to create a multiplied haversign signal; stripping off high frequency characteristics of the multiplied haversign signal to create a haversign signal; receiving a first inductor current through a first switch; comparing a magnitude of the haversign signal with a value of the first inductor current; and generating a first driving signal to turn off the first switch if the value of the first inductor current is larger than the magnitude of the haversign signal. 7. The method of claim 6, further including receiving a second inductor current through a second switch; comparing a magnitude of the haversign signal with a value of the second inductor current; and generating a second driving signal to turn off the second switch if the value of the second inductor current is larger than the magnitude of the haversign signal. 8. The method of claim 7, further including, receiving the AC input voltage at a first inductor and a second inductor; rectifying the AC input voltage using the first switch, the second switch, a first diode, and a second diode to produce an intermediate DC voltage. 9. A method of power factor correction, comprising: receiving an AC input voltage; generating an intermediate DC voltage; generating, at a waveform generator, a haversign waveform; generating a pulsed signal based on the intermediate DC voltage; multiplying the haversign waveform and the pulsed signal to create a multiplied haversign signal; stripping off high frequency characteristics of the multiplied haversign signal to create a haversign signal; receiving a first inductor current through a first switch; comparing a clipping threshold value with a value of the first inductor current; and generating a first driving signal to turn off the first switch if the value of the first inductor current is larger than the magnitude of the clipping threshold value. 10. The method of claim 9, further including, receiving a second inductor current through a second switch; comparing the clipping threshold value with a value of the second inductor current; and generating a second driving signal to turn off the second switch if the value of the second inductor current is larger than the clipping threshold value. 11. The method of claim 10, further including, receiving the AC input voltage at a first inductor and a second inductor; rectifying the AC input voltage using the first switch, the second switch, a first diode, and a second diode to produce an intermediate DC voltage.