Apparatus to realize fast battery charging and motor driving for electric vehicles using one AC/DC converter
First Claim
1. An electric power conversion apparatus, comprising:
- an electronic controller including a processor and a memory;
a switching block controlled by said controller and having a first interface configured to be connected to a power grid source for receiving a first AC signal having first, second, and third phases, said switching block having a second interface configured to be connected to an electric motor;
a three-phase bidirectional AC/DC converter configured to be connected to a third interface of said switching block and including first, second, and third single-phase AC/DC conversion modules each connected to and controlled by said controller, said AC/DC conversion modules having respective inputs, respective outputs joined at an output node, and a respective transformer configured to provide electrical isolation;
wherein in a first mode of operation, said controller controls said switching block to assume a first condition that (i) connects said first and third interfaces so that said power grid is connected to said three-phase AC/DC converter which is controlled to convert said first AC signal to an output signal having a DC component at said output node for charging a battery, and (ii) disconnects said second and third interfaces to thereby disconnect said electric motor;
wherein in a second mode of operation, said controller controls said switching block to assume a second condition that (i) disconnects said first and third interfaces so as to disconnect said power grid, and (ii) connects said second and third interfaces to connect said electric motor to said three-phase bidirectional AC/DC converter which is controlled to convert DC power drawn from said battery to a second AC signal for energizing said electric motor; and
wherein each AC/DC conversion module respectively comprises (i) a rectifier stage for converting a respective phase of said first AC signal into a DC signal, and (ii) a dual-active-bridge (DAB) stage configured to convert said DC signal into said output signal having said DC component, wherein each dual-active-bridge (DAB) stage includes;
(i) a first full bridge coupled to said rectifier stage including a plurality of DC to AC switches,(ii) said transformer having a respective primary winding coupled to said first full bridge, said transformer having an electrically isolated and magnetically coupled secondary winding, and(iii) a second full bridge between said secondary winding and said output node and including a plurality of AC to DC switches.
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Abstract
An apparatus includes a controller, a switching block, and a three-phase bidirectional AC/DC converter. The switching block has a first interface connected to a power grid, a second interface connected to an electric motor, and a third interface connected to the three-phase bidirectional AC/DC converter that includes first, second, and third single-phase AC/DC conversion modules, and which have inputs and outputs joined at an output node, and a respective transformer configured to provide electrical isolation. In a first mode of operation, the switching block connects the power grid to the AC/DC converter for charging a battery connected to the output node and disconnects the electric motor. In a second mode of operation, the switching block disconnects the power grid and connects the electric motor to the AC/DC converter which is controlled to convert DC power drawn from the battery to energize the electric motor.
13 Citations
15 Claims
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1. An electric power conversion apparatus, comprising:
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an electronic controller including a processor and a memory; a switching block controlled by said controller and having a first interface configured to be connected to a power grid source for receiving a first AC signal having first, second, and third phases, said switching block having a second interface configured to be connected to an electric motor; a three-phase bidirectional AC/DC converter configured to be connected to a third interface of said switching block and including first, second, and third single-phase AC/DC conversion modules each connected to and controlled by said controller, said AC/DC conversion modules having respective inputs, respective outputs joined at an output node, and a respective transformer configured to provide electrical isolation; wherein in a first mode of operation, said controller controls said switching block to assume a first condition that (i) connects said first and third interfaces so that said power grid is connected to said three-phase AC/DC converter which is controlled to convert said first AC signal to an output signal having a DC component at said output node for charging a battery, and (ii) disconnects said second and third interfaces to thereby disconnect said electric motor; wherein in a second mode of operation, said controller controls said switching block to assume a second condition that (i) disconnects said first and third interfaces so as to disconnect said power grid, and (ii) connects said second and third interfaces to connect said electric motor to said three-phase bidirectional AC/DC converter which is controlled to convert DC power drawn from said battery to a second AC signal for energizing said electric motor; and wherein each AC/DC conversion module respectively comprises (i) a rectifier stage for converting a respective phase of said first AC signal into a DC signal, and (ii) a dual-active-bridge (DAB) stage configured to convert said DC signal into said output signal having said DC component, wherein each dual-active-bridge (DAB) stage includes; (i) a first full bridge coupled to said rectifier stage including a plurality of DC to AC switches, (ii) said transformer having a respective primary winding coupled to said first full bridge, said transformer having an electrically isolated and magnetically coupled secondary winding, and (iii) a second full bridge between said secondary winding and said output node and including a plurality of AC to DC switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification