Patent ID: 7656636
Filing Date: 2010-02-02
Classification: H01H,H02H

Abstract:
1. An electronic trip device comprising: at least one current sensor for supplying a secondary current representative of a primary current in a main conductor of a circuit breaker, a rectifying circuit for rectifying the secondary current and for supplying a supply current, an electronic processing unit for controlling an actuator capable of actuating an opening mechanism of the main conductor, and an electric power supply circuit having a storage capacitor for supplying the actuator with electric power and a voltage regulator for supplying a supply voltage to the electronic processing unit, said storage capacitor being charged by the supply current, wherein the power supply circuit comprises voltage raising means supplying a raised voltage to an input of the voltage regulator, said raised voltage being greater than a voltage at the terminals of the storage capacitor, the voltage raising means comprise a voltage limiter connected in series with the storage capacitor, for accelerating an increase in voltage level of the raised voltage when the supply current flows to charge said storage capacitor, and for enabling the raised voltage to reach a value greater than or equal to the sum of the voltage at the terminals of said capacitor and of a limiting voltage of said voltage limiter, and the voltage raising means further comprise a resistor connected in series with the storage capacitor such that when the supply current flows to charge said storage capacitor, the raised voltage has a value greater than or equal to the sum of the voltage at the terminals of said capacitor and of the voltage at the terminals of said resistor.