US 2015/0029762 A1 · VOLTAGE CONVERTER COMPENSATION APPARATUS AND METHODS

Abstract

On the secondary side of a flyback switching power converter, a compensation diode and a voltage divider with an averaging circuit generate an output current-compensated reference voltage that is proportional to converter output current. The current-compensated reference voltage is added to a regulation feedback controller reference voltage, which in turn adjusts the negative feedback signal to the PWM regulation controller on the primary side in proportion to the converter output current draw. The net effect is to increase the converter output voltage set-point in proportion to the converter output current draw as compensation for a voltage drop in a cable connecting the converter to a powered device. More precisely-regulated voltage levels may be delivered to an input of the powered device as a result.

Claims20

Dependent claims

A voltage drop compensation apparatus associated with voltage regulation in a flyback voltage converter, comprising:

an output voltage sense circuit to couple to an output of the voltage converter to generate an output voltage sense signal proportional to an output voltage generated by the voltage converter;
a regulation feedback controller coupled to the output voltage sense circuit to determine a voltage difference between the output voltage sense signal and a reference voltage and to generate a negative feedback control signal to send to a pulse width modulation (“PWM”) regulation controller, the negative feedback control signal to cause the PWM regulation controller to drive the converter output voltage closer to a set-point determined by the reference voltage;
and
an output current proportional voltage divider to couple to a secondary winding of a flyback transformer associated with the voltage converter to increase the reference voltage in proportion to a magnitude of current flow at the output of the converter and to increase the converter output voltage set-point to compensate for a voltage drop between the converter and a device powered by the converter.

1 more element

A voltage drop compensation apparatus associated with voltage regulation in a flyback voltage converter, comprising:

an output voltage sense circuit to couple to an output of the voltage converter to generate an output voltage sense signal proportional to an output voltage generated by the voltage converter;
a regulation device coupled to the output voltage sense circuit to determine a voltage difference between the output voltage sense signal and a reference voltage and to generate a negative feedback control signal proportional to the voltage difference, the negative feedback control signal to cause a pulse width modulation (“PWM”) regulation controller to drive the converter output voltage closer to a set-point determined by the reference voltage;
and
an output current proportional voltage divider and averaging circuit to couple to a secondary winding of a flyback transformer associated with the voltage converter to increase the reference voltage in proportion to current flow at the output of the voltage converter in order to increase the converter output voltage set-point to compensate for a voltage drop in a cable to couple the converter output to a device powered by the converter.

1 more element

Dependencies are inferred from the claim text.

Voltage converter compensation apparatus and methods

Life of this patent

Voltage converter compensation apparatus and methods

Life of this patent

Abstract

Claims20