JP2013188084A5

JP2013188084A5 - DC / DC converter and system

Info

Publication number: JP2013188084A5
Application number: JP2012053545A
Authority: JP
Filing date: 2012-03-09
Publication date: 2015-04-02
Anticipated expiration: 2032-03-09

Description

このような構成によれば、フルブリッジ型とハーフブリッジ型の切り替えのときに入力
電力が不連続となることを抑制することにより、入力追従制御に支障を来さない。
上記目的を達成するために本発明は、太陽電池、燃料電池、または蓄電池のうちの少なくとも１つと、前記太陽電池、前記燃料電池、または前記蓄電池のいずれかが入力側に接続されたＬＬＣ共振方式を用いたＤＣ／ＤＣコンバータを備えるシステムであって、
前記ＤＣ／ＤＣコンバータは、
スイッチング素子と、
ＤＣ／ＤＣコンバータの入力電圧を検出する入力電圧検出部と、
前記入力電圧検出部によって検出された入力電圧と閾値電圧との比較に基づき、前記スイッチング素子の駆動形式をフルブリッジ型とハーフブリッジ型とで切り替える制御を行う制御部と、を備え、
前記制御部は、前記切り替えを行うときに、入力電力に応じたパルス幅の駆動信号により切り替え後の駆動を行う構成としている。 According to such a configuration, the input follow-up control is not hindered by suppressing the discontinuity of the input power when switching between the full bridge type and the half bridge type.
In order to achieve the above object, the present invention provides an LLC resonance method in which at least one of a solar cell, a fuel cell, or a storage battery, and any one of the solar cell, the fuel cell, or the storage battery is connected to an input side. A system comprising a DC / DC converter using
The DC / DC converter is
A switching element;
An input voltage detector for detecting an input voltage of the DC / DC converter;
A control unit that performs control to switch the drive type of the switching element between a full-bridge type and a half-bridge type based on a comparison between an input voltage detected by the input voltage detection unit and a threshold voltage;
The control unit is configured to perform driving after switching by a driving signal having a pulse width corresponding to input power when performing the switching.

Claims

A DC / DC converter using an LLC resonance method,
A switching element;
An input voltage detector for detecting an input voltage of the DC / DC converter;
A control unit that performs control to switch the drive type of the switching element between a full-bridge type and a half-bridge type based on a comparison between an input voltage detected by the input voltage detection unit and a threshold voltage;
The control unit, when performing the switching, performs driving after switching with a driving signal having a pulse width corresponding to input power.

2. The DC / DC converter according to claim 1, wherein the threshold voltage is variable in accordance with the direction in which the input voltage changes.

An input power detection unit for detecting the input power of the DC / DC converter;
A plurality of the threshold voltages are set according to at least one threshold input power,
The DC / DC converter according to claim 1 or 2, wherein the threshold voltage to be used is determined based on a comparison between the input power detected by the input power detection unit and the threshold input power. .

An input power detection unit for detecting the input power of the DC / DC converter;
A storage unit storing a table in which the relationship between the input power range and the pulse width is defined;
The said control part reads the pulse width according to the input power detected by the said input power detection part from the said table, when performing the said switching, The any one of Claims 1-3 characterized by the above-mentioned. The DC / DC converter described in 1.

An input power detection unit for detecting input power of the DC / DC converter;
A storage unit that stores the pulse width after switching according to the range of input power, and
When the control unit performs the switching, the control unit reads out a pulse width corresponding to the input power detected by the input power detection unit from the storage unit by a branching process of a CPU provided in the control unit. The DC / DC converter according to any one of claims 1 to 4.

The control unit, when performing switching, acquires a pulse width after switching processing according to an input voltage and input power by performing a calculation according to a relational expression with a pulse width before switching. The DC / DC converter according to any one of claims 1 to 3.

The DC / DC converter according to any one of claims 1 to 6, wherein the control unit includes a switching signal output unit and a flip-flop.
By using the switching signal output by the switching signal output means as an input signal to the flip-flop and a pulse width drive signal output from the control unit as a clock input, the half bridge type to the full bridge type, or the full bridge type The DC / DC converter is characterized in that the change of the drive format and the output of the drive pulse width are synchronized when switching from the half-bridge type.

The DC / DC converter according to any one of claims 1 to 7, wherein the switching of the drive type from the half-bridge type to the full-bridge type is reverse to the switching element at the time of the half-bridge type drive before the switching. A DC / DC converter characterized in that soft switching is realized by switching to a pulse width longer than a current commutation period to diodes connected in parallel.

At least one of a solar cell, a fuel cell, or a storage battery;
A system comprising the DC / DC converter according to claim 1, wherein any one of the solar cell, the fuel cell, and the storage battery is connected to an input side.