Boost circuit and hybrid electric vehicle with it

Abstract

The invention discloses a boost circuit. The boost circuit comprises a first output end, a second output end, a third output end, a switching tube, an energy conversion module, an electrode conversion module and a sampling control module, wherein the energy conversion module is used for converting the energy in an input power supply to output a first voltage through the output ends; the electrode conversion module is used for converting polarities between the second output end and the third output, so that the first voltage and voltages at two ends of the input power supply are superposed and output through the output ends; and the sampling control module is used for sampling the voltages and currents of the first output end, the second output end and the third output end and generating control signals according to the sampled voltages and currents to control the switching tube so as to adjust the voltages output by the output ends. According to the boost circuit, the output and input power supplies are connected in series for boost, when the power supplies with identical voltages and power are output, the conversion efficiency of the power supplies is improved, sizes of devices are reduced, and device parameter standards are reduced, so that the cost is reduced. The invention further discloses a hybrid electric vehicle.

Description

technical field [0001] The invention relates to the technical field of power vehicles, in particular to a booster circuit and a hybrid vehicle with the booster circuit. Background technique [0002] In a hybrid drive vehicle, the voltage of the main battery pack mounted on the vehicle is relatively low. For example, the voltage of the main battery pack of a hybrid electric vehicle is 201V, but the voltage of the main drive motor needs to be about 500V, so in the main drive When the motor is working, it is necessary to increase the voltage of the 201V main battery pack to about 500V, and because the power of the main drive motor is greater than 50KW, the boost inductance is very large to complete the energy conversion. Due to the large boost inductance, it will bring certain difficulties to the layout of the whole vehicle and affect the efficiency of the whole vehicle. [0003] In addition, if figure 1 As shown, the conventional transformer (boost and step-down) circuits in...

AI Technical Summary

Problems solved by technology

Due to the large boost inductance, it will bring certain difficulties to the layout of the vehicle and affect the efficiency of the vehicle

[0003] In addition, if figure 1 As shown, the traditional transformer (boost and step-down) circuit includes a conversion circuit, and the output power of VO is passed through the conversion circuit. Therefore, the output power is completely converted by the buck-boost conversion circuit.

Moreover, the energy output after voltage conversion needs to be realized through circuit switch conversion, so that conversion loss is inevitable during the energy conversion process, and the output power of voltage conversion will also be restricted by the capacity and parameters of the device, which will result in low conversion efficiency. , large volume, high cost

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