Feedback-type DC electronic load circuit having high voltage and wide voltage input range
A DC electronic load, wide voltage input technology, applied in high-efficiency power electronic conversion, AC power input conversion to DC power output, DC power input conversion to DC power output, etc. Voltage input range, no high frequency transformer isolation, etc.
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[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0054] like figure 1 As shown, the present invention proposes a high voltage, wide voltage input range feedback DC electronic load circuit, including an isolated DC / DC converter, a DC / AC converter and a control unit; the DC tested equipment with a wide voltage input range is isolated type DC / DC converter and DC / AC converter to achieve grid-connected energy feedback; the isolated DC / DC converter adopts a two-stage structure, including two-phase interleaved parallel BOOST converter 1 and LLC-DCX converter 2, DC / DCX The AC converter adopts T-type inverter 3, and the control unit includes sampling circuit and DSP digital control.
[0055] The first stage of the two-stage isolated DC / DC converter includes a first switch tube Q 1 , the second switching tube Q 2 , the first diode D 1 , the second diode D 2 , the third diode D 3、 The first inductance L1 a...
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