| CPC H02M 3/33584 (2013.01) [H04L 12/10 (2013.01)] | 17 Claims |
|
1. A bidirectional converter, wherein the bidirectional converter is arranged in an Ethernet device, comprising:
a first switch transistor, having a first end connected to a first wiring terminal of a network port, and a second end connected to a first end of a primary winding of a first transformer;
a second switch transistor, having a first end connected to a second wiring terminal of the network port, and a second end connected to a second end of the primary winding of the first transformer;
the first transformer; wherein secondary windings of the first transformer comprise a first secondary winding and a second secondary winding, a second end of the first secondary winding is connected to a first end of the second secondary winding, and a connection end there-between is connected to a positive electrode of a load bus; and the first end of the primary winding of the first transformer, a first end of the first secondary winding and the first end of the second secondary winding are dotted terminals of each other;
a third switch transistor, having a first end connected to the first end of the first secondary winding, and a second end respectively connected to a second end of a fourth switch transistor and a negative electrode of the load bus;
the fourth switch transistor, having a first end connected to a second end of the second secondary winding; and
a controller; wherein control ends of the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor are all connected to the controller, and the controller is configured to: enable the bidirectional converter to be in a forward mode or in a flyback mode by controlling respective on/off states of the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor;
wherein the bidirectional converter is configured to: in response to being in the forward mode, receive power supplied from the network port and transmit electric energy to the load bus, and in response to being in the flyback mode, receive power supplied from the load bus and transmit electric energy to the network port;
wherein in the forward mode, any one of the first wiring terminal of the network port and the second wiring terminal of the network port is used as a positive electrode power supply end, and a voltage of the positive electrode of the load bus is higher than a voltage of the negative electrode of the load bus,
wherein the controller is configured to:
in response to controlling the bidirectional converter to be in the flyback mode, control the bidirectional converter to periodically switch between a preset first state and a preset second state, or control the bidirectional converter to periodically switch between a preset third state and the preset second state;
in response to controlling the bidirectional converter to be in the forward mode and in response to a voltage of the first wiring end of the network port being higher than a voltage of the second wiring end of the network port, control the bidirectional converter to periodically switch between a preset fourth state and a preset fifth state; and
in response to a voltage of the second wiring terminal of the network port being higher than a voltage of the first wiring terminal of the network port, control the bidirectional converter to periodically switch between a preset sixth state and a preset seventh state;
wherein:
the first state is: the third switch transistor and the first switch transistor are in a turned-off state, and the fourth switch transistor and the second switch transistor are in a turned-on state;
the second state is: the third switch transistor and the fourth switch transistor are in a turned-off state, and the first switch transistor and the second switch transistor are in a turned-on state;
the third state is: the third switch transistor and the first switch transistor are in a turned-on state, and the fourth switch transistor and the second switch transistor are in a turned-off state;
the fourth state is: the first switch transistor, the second switch transistor and the fourth switch transistor are in a turned-on state, and the third switch transistor is a turned-off state;
the fifth state is: the first switch transistor and the third switch transistor are in a turned-on state, and the second switch transistor and the fourth switch transistor are in a turned-off state;
the sixth state is: the first switch transistor, the second switch transistor, and the third switch transistor are in a turned-on state, and the fourth switch transistor is in a turned-off state; and
the seventh state is: the second switch transistor and the fourth switch transistor are in a turned-on state, and the first switch transistor and the third switch transistor are in a turned-off state.
|