PWM control for power distribution circuit interrupting devices

An electronic control circuit for one or more protective relays in a power distribution system circuit interrupting device, the electronic control circuit comprising:

• a boost circuit configured to increase a low DC input voltage to a higher DC output voltage that is greater than a threshold voltage used to drive the one or more protective relays;
• a capacitor storage unit electrically coupled to the boost circuit, the capacitor storage unit is configured to store the higher DC output voltage of the boost circuit and to output a fixed DC voltage that is greater than the threshold voltage;
• and
• a pulse width modulator control circuit electrically coupled to the capacitor storage unit and configured to receive the fixed DC voltage from the capacitor storage unit, the pulse width modulator control circuit being responsive to one or more input pulses from a control and enable circuit to turn “on” and “off” a voltage to the one or more protective relays in the power distribution system circuit interrupting device at a frequency of at least 1 KHz to regulate energy delivered from the capacitor storage unit to the one or more protective relays for multiple instances of turning “on” and “off” the voltage to the one or more protective relays without waiting for the capacitor storage unit to charge to output the fixed DC voltage by limiting current flow to the one or more protective relays to a predefined steady state value.

An electronic control circuit for one or more protective relays in a power distribution system circuit interrupting device, the electronic control circuit comprising:

• a boost circuit configured to increase a low DC input voltage to a higher DC output voltage that is greater than a threshold voltage used to drive the one or more protective relays;
• a capacitor storage unit electrically coupled to the boost circuit, the capacitor storage unit is configured to store the higher DC output voltage of the boost circuit and to output a fixed DC voltage that is greater than the threshold voltage;
• and
• a pulse width modulator control circuit electrically coupled to the capacitor storage unit and configured to receive the fixed DC voltage from the capacitor storage unit, the pulse width modulator control circuit is configured to turn “on” and “off” a voltage to the one or more protective relays in power distribution system circuit interrupting device at a frequency of at least 1 KHz to regulate energy delivered from the capacitor storage unit to the one or more protective relays for multiple instances of turning “on” and “off” the voltage to the one or more protective relays without waiting for the capacitor storage unit to charge to output the fixed DC voltage based on the current flow to the one or more protective relays.