CONVERTER CONTROL DEVICE

• US 20090316453A1
• Filed: 10/01/2007
• Published: 12/24/2009
• Est. Priority Date: 10/20/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Manabe, Kota, Maenaka, Takeshi, Hasegawa, Takahiko
• Granted Patent: US 8,159,850 B2
• Time in Patent Office: Days
• US Class Current: 363/78
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H02P 23/0004 Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

A converter control device includes a converter device formed by three converter circuits connected together in parallel between a secondary battery as a first power source and a fuel cell as a second power source. A control unit includes: a PID control module for controlling the converter device by PID control and executing a desired voltage conversion; a drive phase quantity changing module for changing the number of drive phases of the converter device in accordance with the passing power of the converter device; and an integration term correction function switching module which switches the PID control integration term correction function when changing the number of drive phases.

Claims

1. A converter control device, including an arrangement in which a plurality of converters are connected together in parallel, the converters being connected between a first power source and a second power source and each having a plurality of switching elements and a reactor to convert a voltage in both directions, and changes the number of converter phases to be driven according to converter passing power, the converter control device comprising:

a control unit feeding back a measured value of duty ratio of an actual operation with respect to an instruction value of the duty ratio provided to the plurality of switching elements for the voltage conversion, to inhibit a deviation between the measured value of the duty ratio and the instruction value of the duty ratio by PID control;

a storage section which, in order to correct the integration term in the PID control, predetermines and stores a correction function for the integration term in each drive phase quantity, the correction function corresponding to a relationship between converter passing power and a correction value for the integration term; and

a correction function switching section which, when number of drive phases is changed according to the converter passing power, switching to the correction function for the integration term corresponding to the changed number of drive phases of the converters.

2. The converter control device according to claim 1, wherein the storage section stores the integral correction value for each of the states into which the state of the converter passing power is distinguished and which include a positive state that the power passes from a first power source side to a second power source side, a negative state that the power passes from the second power source side to the first power source side, and a zero cross state that is intermediate between the positive state and the negative state.

3. The converter control device according to claim 2, wherein the storage section stores the integral correction value for each of the states of the converter passing power distinguished from one another based on comparison between predefined thresholds and both a maximum value and a minimum value for a converter passing current waveform varying depending on a control cycle of the duty ratio.