HD22020-3 EMERSON Power Module

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Product Details

The Emerson rectifiers comprise two parts: 3phase passive PFC and DC/DC converter circuit. Besides, there are the auxiliary power supply and the I/O detection protection circuit. The operation principle of rectifiers is shown in Figure HD22020-3

The 3-phase passive PFC circuit at the front-end comprises input EMI and passive PFC, which are used to rectify and filter the AC input, and to calibrate the input current, so as to ensure that the power factor of the input circuit is bigger than 0.94, meeting the related EMI and EMC standards in GB/T 17794.2.2-2003, as well as the 3-phase harmonic standard in DL/T781-2001.

The DC/DC converter circuit at the back end uses PWM generator to control the PFC-output DC voltage, and output DC voltage through high frequency transforming, rectification and filtering. It is used to convert the rectified voltage from the front end into the steady DC voltage output as required by the power system.

The auxiliary power supply is located between the input passive PFC and the DC/DC converter. It uses the DC output from the 3-phase passive PFC and powers the control circuits.

The input detection circuit can detect input over/under-voltage and phase failure, while DC/DC detection circuit can detect output voltage/current and heat sink temperature. All these signals are used for the control and protection of DC/DC conversion.

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