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Controller for DC/DC converter

A technology of DC converters and control devices, applied in the direction of output power conversion devices, control/regulation systems, instruments, etc., which can solve problems such as errors, different offsets, and large transformers, so as to suppress costs and simplify configurations Effect

Active Publication Date: 2013-01-30
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the current sensor has an offset due to individual differences caused by mass production variation, and the offset amount is not the same
Therefore, if the current difference is calculated from the outputs of a plurality of current sensors as in the technique described in Patent Document 1, only the difference in the offset amount of each sensor will cause an error between the actual current differences, and as a result , it may not be possible to properly control the action of the first and second switching elements
[0009] In addition, when there is an error, even if the operation of the switching element is controlled so that the current difference becomes zero, the magnetic flux generated by the current of the error part remains in the transformer.
Therefore, due to the residual magnetic flux, it is necessary to increase the size of the transformer in order not to saturate the transformer magnetically.

Method used

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Embodiment 1

[0040] figure 1 It is a schematic diagram generally showing the control device of the DC / DC converter according to the first embodiment of the present invention.

[0041] exist figure 1 In , symbol 10 represents a vehicle. The vehicle 10 is composed of a fuel cell vehicle, and is equipped with a rotating electrical machine 12 (indicated by "electric motor" in the figure), a fuel cell (indicated by "FC" in the figure) 14, DC / DC converter 16 and inverter 20.

[0042] The rotating electric machine 12 is constituted by a brushless AC synchronous motor, and transmits a rotational output to wheels (drive wheels) 22 via a connecting shaft S when energized, thereby driving the vehicle 10 . The rotary electric machine 12 has a regenerative function of converting kinetic energy generated with the rotation of the connecting shaft S into electric energy and outputting the electric energy during deceleration. That is, the rotary electric machine 12 functions as a motor (motor) when energ...

Embodiment 2

[0096] Next, a control device for a DC / DC converter according to a second embodiment of the present invention will be described.

[0097] The description will focus on the points of difference from the first embodiment. In the second embodiment, the DC / DC converter 16 is mounted on a hybrid electric vehicle (HEV).

[0098] Figure 7 is a whole representation of the control device of the DC / DC converter according to the second embodiment and figure 1 Same sketch.

[0099] Such as Figure 7 As shown, a hybrid vehicle 100 includes an internal combustion engine (hereinafter referred to as "engine") 102 as a drive source in addition to a rotary electric machine 12 . The engine 102 is a gasoline-injected spark ignition type and has four cylinders, and is connected to a rotary electric machine 12 via a drive shaft S1 , and outputs of the rotary electric machine 12 and the engine 102 are input to a transmission 104 . The transmission 104 changes the speed of these outputs and tran...

Embodiment 3

[0104] Next, a control device for a DC / DC converter according to a third embodiment of the present invention will be described.

[0105] The description will focus on the points of difference from the first embodiment. In the third embodiment, the DC / DC converter 16 is mounted on an electric vehicle (EV).

[0106] Figure 8 is the overall representation of the control device of the DC / DC converter according to the third embodiment and figure 1 Same sketch.

[0107] Such as Figure 8 As shown, an electric vehicle 200 is equipped with a battery 202 instead of the fuel cell 14 of the first embodiment. The battery 202 is constituted by a secondary battery (storage battery) such as a lithium ion battery, as in the second embodiment.

[0108] Thus, in the third embodiment, since the DC / DC converter 16 is configured to be mounted on the electric vehicle 200, in the electric vehicle 200, the size of the transformer 16e can be increased without increasing the size of the transforme...

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Abstract

A controller for a DC / DC converter is disclosed. Specifically disclosed is a controller which comprises a current sensor (24) which senses a current passing through a positive line (16h1) that connects a second common terminal (16k2), located downstream of first and second windings (16e1), (16e2) of a magnetic offset transformer (16e), and a positive terminal (16b1) of a high-voltage-side port (16b). On the basis of the current sensed by the current sensor (24), the controller controls the operations of first and second switching elements (16f1), (16f2) connected with the respective windings. This allows the controller to accurately sense currents passing through the respective windings (16e1), (16e2) without an increase in the size of the transformer (16e), and to appropriately control the operations of the switching elements (16f1), (16f2) on the basis of the sensed currents.

Description

technical field [0001] The invention relates to a control device for a DC / DC converter. Background technique [0002] In recent years, a DC / DC converter has been proposed (for example, refer to Patent Document 1), which includes: a magnetic cancellation type transformer having first and second windings wound on an iron core in different winding directions; and 1st and 2nd switching elements connected to each winding. In addition, in the technology described in Patent Document 1, a plurality of (two) current sensors are used to detect the currents of the first and second windings, calculate the current difference (difference), and control the first and second switching elements. operation so that the calculated current difference becomes 0. [0003] Prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2008-43104 [0006] Summary of the invention [0007] The problem to be solved by the invention [0008] However, curr...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M1/00
CPCH02M3/1584H02M1/40H02M2001/0009H02M1/0009
Inventor 桥野哲安藤启吾平川三昭
Owner HONDA MOTOR CO LTD
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