HIGHER HARMONIC REDUCING FILTER

PURPOSE:To suppress PWM higher harmonics by inserting a circuit comprising an inductance, a capacitor and a resistor, connected in parallel, between a carrier frequency locked higher harmonic(PWM) inverter and a load and then resonating the circuit with frequency approximately two times of the carri...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	TAKAKADO YUZO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	PURPOSE:To suppress PWM higher harmonics by inserting a circuit comprising an inductance, a capacitor and a resistor, connected in parallel, between a carrier frequency locked higher harmonic(PWM) inverter and a load and then resonating the circuit with frequency approximately two times of the carrier frequency. CONSTITUTION:A higher harmonic reducing filter 3 is a parallel circuit of an inductance 4, capacitor 5 and resistor 6, and the filter 3 is inserted between a PWM inverter 1 and each phase of a load 2. PWM higher harmonic composed of 2fc component is sufficiently suppressed with no influence on the basic wave when parallel resonance with frequency 2fc is induced by setting the inductance L of the inductance 4 and the capacitance C of the capacitor 5 are set such that 2fc=1/2 LC. By such arrangement, higher harmonic can be suppressed in a frequency region sufficiently higher than the basic frequency.