The bidirectional DC-DC converter is a device that realizes the bidirectional flow of DC power, and is mainly used in hybrid electric vehicles and DC uninterrupted power supply systems, etc.
The bidirectional DC converter adopts the classic BUCK/BOOST circuit topology and has the function of buck-boost bidirectional conversion, that is, the buck-boost chopper circuit. When energy flows from C1 to C2, the DC converter works in BOOST mode to realize the boost function; when energy flows from C2 to C1, the DC converter works in BUCK mode to realize the step-down function.
Constant voltage charging and discharging machine conversion, constant power charging, discharging and conversion, etc.;
Two-way step-up and down-boost on the battery side and the DC bus side; l Compatible with a variety of different configurations and models of batteries;
When the battery side is connected to the photovoltaic panel, it has the MPPT function;
Parallel operation control function of multiple converters (master-slave control, droop control);
Principle of Bidirectional DC ConverterThe so-called bidirectional DC-DC converter is the dual-quadrant operation of the DC-DC converter. Its input and output voltage polarity remains unchanged, but the direction of the input and output current can be changed. The output state of the converter can be changed in the first and second quadrants of the Vo-lo plane. The converter's input and output ports can still be exchanged to complete the voltage conversion function. Power can not only flow from the input end to the output end, but also from the output end to the input end. Figure 1-1 is a schematic diagram of the two ports of the BDC. From the perspective of various basic converter topologies, using bidirectional switches instead of unidirectional switches can achieve bidirectional flow of energy.
The bidirectional DC-DC converter realizes the two-way transmission of energy. It is equivalent to two unidirectional DC-DC converters in function. It is a typical dual-purpose device. It can be greatly reduced in applications that require bidirectional energy flow. The volume, weight and cost of the system have important research value.
Application of bidirectional DC-DC converterWhere there is a need for bidirectional energy flow between DC power sources (or DC source loads) in a system, bidirectional DC-DC converters are required. Therefore, DC motor drive systems, uninterrupted power supply systems, aerospace power supply systems, solar (wind) power generation systems, energy storage systems (such as superconducting energy storage), electric vehicle systems and other systems have their applicable occasions. Here are a few pre-researched or applied examples to make the concept of BDC clearer.
Introduction of bidirectional DC converter due to public environment The bidirectional DC-DC converter is a DC-to-DC converter capable of adjusting energy bidirectional transmission according to energy needs. The bidirectional DC-DC converter realizes the charging function of the battery through the constant current source composed of the integrated operational amplifier and the triode, and the boost circuit composed of TL494 realizes the discharge function of the battery. The LCD screen is used to display the charging current of the rechargeable battery. And can automatically switch the converter charging and discharging work mode. This work has a simple circuit, high efficiency, and stable performance; it can meet the requirements of the subject and can be applied to DC non-stop power systems, solar battery converters, electric vehicles, etc.
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