DC converters with modified droop control and method of use

An electrical power system, comprising:

• a DC bus configured to be coupled to an electrical load;
• a first DC converter defining a first droop characteristic and a first resonant frequency, said first DC converter coupled to said DC bus, said first DC converter configured to operate substantially at the first resonant frequency to generate a DC output voltage on said DC bus according to a first variable reference voltage;
• a second DC converter defining a second droop characteristic and a second resonant frequency, said second DC converter coupled to said DC bus, said second DC converter configured to operate substantially at the second resonant frequency to generate the DC output voltage on said DC bus according to a second variable reference voltage, said second DC converter further configured to share the electrical load with said first DC converter;
• and
• wherein said DC bus is operable in a range of 22 volts DC to 29 volts DC, inclusively.

A method of controlling a direct current (DC) to DC converter, said method comprising:

• measuring an output current of the DC to DC converter;
• generating a reference voltage as a function of the output current, an input voltage of the DC to DC converter, and a voltage setpoint for the DC to DC converter;
• computing the reference voltage such that the reference voltage produces a substantially constant switching frequency substantially equal to a resonant frequency of the DC to DC converter;
• operating the DC to DC converter substantially at the resonant frequency according to the reference voltage to generate a DC output voltage;
• receiving a variable input voltage;
• and
• generating the reference voltage as a function of the output current, the variable input voltage, and the voltage setpoint.