DC-AC conversion circuit having a first double ended DC pulse stage and a second AC stage
A voltage converter system includes a first DC-AC voltage converter that converts a first DC voltage signal to a first AC voltage signal. A DC link converts the first AC voltage signal to a second DC voltage signal. A second DC-AC voltage converter converts the second DC voltage signal to a second AC voltage signal. In another configuration a DC-AC voltage converter converts a DC voltage signal to a first AC voltage signal. An AC-AC voltage converter converts the first AC voltage signal to a second, lower-frequency AC voltage signal. In yet another configuration a first voltage converter portion converts a DC voltage signal to pulses of DC voltage. A second voltage converter portion converts the pulses of DC voltage to a relatively low-frequency AC voltage signal. The voltage converter system is selectably configurable as a DC-AC voltage converter or an AC-DC voltage converter.
1. A voltage converter system comprising:
a first voltage converter portion, configured to receive a DC voltage signal and convert the DC voltage signal to pulses of DC voltage;
and a second voltage converter portion, configured to receive the pulses of DC voltage and convert the pulses of DC voltage to an AC voltage signal;
wherein the first voltage converter portion comprises:
a Ćuk-type voltage converter,
and a single-ended primary inductor converter (SEPIC) voltage converter,
the Ćuk-type voltage converter and the SEPIC voltage converter being electrically combined to operate cooperatively;
further wherein a switch and an inductor are common to both the Ćuk-type voltage converter and the SEPIC voltage converter.
2. A voltage converter system comprising:
a first voltage converter portion, configured to receive a DC voltage signal and convert the DC voltage signal to pulses of DC voltage;
and a second voltage converter portion, configured to receive the pulses of DC voltage and convert the pulses of DC voltage to an AC voltage signal;
wherein the first voltage converter portion comprises:
a Ćuk-type voltage converter having two input terminals and an inverting output terminal;
a SEPIC voltage converter having two input terminals and a non-inverting output terminal;
a voltage converter system input terminal pair comprising the respective input terminals of the Ćuk-type voltage converter connected in parallel to the SEPIC voltage converter;
and a voltage converter system output terminal pair comprising the inverting output terminal of the Ćuk-type voltage converter and the non-inverting output terminal of the SEPIC voltage converter.
3. A voltage converter system, comprising:
a first voltage converter portion, configured to receive a DC voltage signal and convert the DC voltage signal to pulses of DC voltage;
and a second voltage converter portion, configured to receive the pulses of DC voltage and convert the pulses of DC voltage to an AC voltage signal;
wherein the first voltage converter portion comprises:
an input stage comprising,
a first input terminal connected to a first end of a first inductor and a second input terminal connected to a first end of a switch,
a second end of the first inductor connected to a second end of the switch at a first node;
the input stage being common to,
a Ćuk-type voltage converter having an inverting output terminal,
and a SEPIC voltage converter having a non-inverting output terminal;
and an output terminal pair comprising the inverting output terminal of the Ćuk-type voltage converter and the non-inverting output terminal of the SEPIC voltage converter.
4. The voltage converter system of claim 3 further comprising:
the first inductor comprising a primary stage of a transformer;
a secondary stage of the transformer having first and second terminals,
the second terminal connected to the inverting output terminal of the Ćuk-type voltage converter at a second node;
the first terminal of the secondary stage of the transformer being connected to an anode of a first diode;
a cathode of the first diode being connected to a first end of a second inductor at a third node;
an anode of a second diode being connected to the second node;
a cathode of the second diode being connected to the third node;
a second end of the second inductor being connected to the non-inverting output terminal of the SEPIC voltage.
5. The voltage converter system of claim 4 further comprising:
the first terminal of the secondary stage of the transformer being polarity-matched to the first input terminal of the input stage.