Composite power system used for hybrid power bus

Abstract

The invention discloses a composite power system used for a hybrid power bus. The composite power system comprises a composite power control box and a vehicle controller and further comprises a bidirectional DC / DC converter and a composite power controller. The bidirectional DC / DC converter comprises a low-voltage bidirectional DC / DC converter and a high-voltage bidirectional DC / DC converter. The high-voltage bidirectional DC / DC converter is connected with a high-voltage battery set, and after the output end is connected with a high-voltage capacitor set used for energy storing and voltage stabilizing in parallel, a high-voltage power supply system is formed. The low-voltage bidirectional DC / DC converter is connected with a low-voltage battery set, and after the output end is connected with a low-voltage capacitor set used for energy storing and voltage stabilizing in parallel, a low-voltage power supply system is formed. The low-voltage capacitor set is sequentially connected with a relay and a diode in series and is then is connected with a starting motor power supply battery in parallel, and therefore an auxiliary circuit for supplying power to a starting motor is formed. By means of the composite power system used for the hybrid power bus, the problem that a diesel engine cannot be started due to the lack of electricity or low-temperature discharge limitation of a storage battery can be effectively solved, the system cost is reduced, and the system size is reduced.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a composite power supply system for hybrid electric passenger vehicles. Background technique [0002] At present, a single power battery system cannot meet the dual needs of energy and power for new energy vehicles. Therefore, in order to meet the needs, a composite power system composed of power batteries and super capacitors has become one of the best energy storage solutions for new energy vehicles. The main function of the management system of the composite power supply is to reasonably allocate the energy switching and energy distribution between the supercapacitor and the power battery by controlling the charging and discharging process between the two, so as to prolong the service life of the system. There are three main types of management systems for hybrid electric vehicle hybrid power storage systems consisting of supercapacitors and power batteries: diode-based, IGBT-bas...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite power supply system for hybrid electric passenger cars, which can effectively solve the problem that the diesel engine cannot be started due to battery loss or low-temperature discharge limitation, reduce system cost, and reduce system volume

Images