Current mode DC/DC converter with controlled output impedance
DCFirst Claim
1. A DC/DC converter having an output voltage and sourcing an output current to a load, said DC/DC converter comprising:
- an error amplifier having a reference input and a summing input, said reference input being electrically connected to a reference voltage, said summing input being electrically connected to each of the output voltage and the output current of said DC/DC converter, said summing input configured for adding together the output voltage and the output current, said error amplifier issuing an error signal and being configured for adjusting said error signal dependent at least in part upon the output voltage and the output current;
a comparator receiving said error signal, said comparator having a ramp input electrically connected to a voltage ramp signal, said comparator having a comparator output signal, said comparator output signal based at least in part upon said error input; and
a power switch having an on condition and an off condition, said power supply configured for supplying dc current to the load when in said on condition, said power switch having a control input electrically connected to said comparator output signal, said power switch being responsive to said comparator output signal to change between said on condition and said off condition to thereby adjust the output current of said DC/DC converter.
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Abstract
A DC/DC converter has an output voltage and sources an output current to a load. The DC/DC converter includes an error amplifier with a reference input and a summing input. The reference input is electrically connected to a reference voltage. The summing input is electrically connected to the output voltage and the output current. The summing input is configured for adding together the output voltage and the output current. The error amplifier issues an error signal and adjusts the error signal dependent at least in part upon the output voltage and the output current. A comparator receives the error signal. The comparator has a ramp input electrically connected to a voltage ramp signal. The comparator issues an output signal that is based at least in part upon said error input. A power switch has an on condition and an off condition, and supplies dc current to the load when in the on condition. The power switch has a control input electrically connected to the comparator output signal. The power switch is responsive to the control input to change between the on condition and the off condition to thereby adjust the output current of the DC/DC converter.
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Citations
19 Claims
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1. A DC/DC converter having an output voltage and sourcing an output current to a load, said DC/DC converter comprising:
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an error amplifier having a reference input and a summing input, said reference input being electrically connected to a reference voltage, said summing input being electrically connected to each of the output voltage and the output current of said DC/DC converter, said summing input configured for adding together the output voltage and the output current, said error amplifier issuing an error signal and being configured for adjusting said error signal dependent at least in part upon the output voltage and the output current;
a comparator receiving said error signal, said comparator having a ramp input electrically connected to a voltage ramp signal, said comparator having a comparator output signal, said comparator output signal based at least in part upon said error input; and
a power switch having an on condition and an off condition, said power supply configured for supplying dc current to the load when in said on condition, said power switch having a control input electrically connected to said comparator output signal, said power switch being responsive to said comparator output signal to change between said on condition and said off condition to thereby adjust the output current of said DC/DC converter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of providing droop in the output voltage of a DC/DC converter having an output current, said method comprising the steps of:
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sensing the output current to thereby determine an output current signal representative of the output current;
further sensing the output voltage to thereby determine an output voltage signal representative of the output voltage;
summing said output current signal and said output voltage signal to thereby determine a voltage feedback signal;
comparing said voltage feedback signal with a reference voltage to thereby determine an error signal;
further comparing said error signal to a ramp voltage signal to thereby determine a current control signal; and
controlling the output voltage based at least in part upon said current control signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for controlling a DC/DC converter having an output voltage and sourcing an output current to a load, the method comprising:
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receiving a signal representative of the output current;
receiving a signal representative of the output voltage;
issuing an error signal dependent at least in part upon the signal representative of the output voltage, the signal representative of the output current and a first reference signal;
issuing a comparison signal, the comparison signal based at least in part upon the error signal and a second reference signal; and
issuing a control signal based at least in part upon the comparison signal, wherein the control signal controls the DC/DC converter. - View Dependent Claims (14, 15, 16, 18)
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17. A method of providing droop in the output voltage of a DC/DC converter having an output current, the method comprising:
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determining an output current signal representative of the output current;
determining an output voltage signal representative of the output voltage;
combining the output current signal, the output voltage signal and a first reference signal to thereby determine an error signal;
comparing the error signal to a second reference signal to thereby determine a control signal; and
controlling the DC/DC converter based at least in part upon said control signal. - View Dependent Claims (19)
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Specification