JPS6430680U - - Google Patents
Info
- Publication number
- JPS6430680U JPS6430680U JP12293887U JP12293887U JPS6430680U JP S6430680 U JPS6430680 U JP S6430680U JP 12293887 U JP12293887 U JP 12293887U JP 12293887 U JP12293887 U JP 12293887U JP S6430680 U JPS6430680 U JP S6430680U
- Authority
- JP
- Japan
- Prior art keywords
- control signal
- duty
- circuit
- fet
- duty control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案に係る車両用ＤＣ／ＤＣコンバ
ータの回路構成を示す図、第２図はその要部電流
電圧波形を示す図、第３図は従来のＤＣ／ＤＣコ
ンバータの回路構成を示す図、第４図はＶＢの電
圧とデユーテイ比との関係を示す図、第５図は第
３図の要部電圧電流波形を示す図である。
１０……主バツテリ、１２……ＤＣ／ＤＣコン
バータ、１４……補機バツテリ、１６……補機系
負荷、１８……主回路、２０……ドライブ回路、
２２……コントロール回路、３２……ＦＥＴ、３
４……主スイツチ、４６……デユーテイ制御ＩＣ
、４８……入力ラインヒユーズ、５０，５２……
ホトカプラ、６６……ソフトオフ回路。
Fig. 1 is a diagram showing the circuit configuration of the vehicle DC/DC converter according to the present invention, Fig. 2 is a diagram showing the main part current and voltage waveforms, and Fig. 3 is a diagram showing the circuit configuration of the conventional DC/DC converter. 4 is a diagram showing the relationship between the voltage of VB and the duty ratio, and FIG. 5 is a diagram showing the voltage and current waveform of the main part of FIG. 3. 10... Main battery, 12... DC/DC converter, 14... Auxiliary battery, 16... Auxiliary system load, 18... Main circuit, 20... Drive circuit,
22...Control circuit, 32...FET, 3
4...Main switch, 46...Duty control IC
, 48... Input line fuse, 50, 52...
Photocoupler, 66...Soft-off circuit.
Claims (1)
フ制御するＦＥＴを含む一次側チヨツパ回路と該
チヨツパ回路の出力を変圧するトランスと該トラ
ンス出力を平滑する出力フイルタ回路とを含む主
回路と、前記ＦＥＴにチヨツパ制御信号を供給す
るデユーテイ制御ＩＣと該デユーテイ制御ＩＣの
デユーテイ制御信号入力端子に前記主回路の二次
側出力電圧を所定のデユーテイ制御信号として供
給する主スイツチを含むドライブ回路を備え、前
記デユーテイ制御ＩＣはデユーテイ制御信号の増
大にともないＦＥＴに供給されるチヨツパ制御信
号のデユーテイ比を減少制御する特性を有する車
両用ＤＣ／ＤＣコンバータにおいて、前記ドライ
ブ回路は主スイツチのオフ作動時に前記デユーテ
イ制御ＩＣに一時的に高いデユーテイ制御信号を
供給するソフトオフ回路を含み、主回路の二次側
出力が完全に消滅するまでＦＥＴをほぼ０デユー
テイに保持することを特徴とする車両用ＤＣ／Ｄ
Ｃコンバータ。 A main circuit including a primary side chopper circuit including an FET that controls on/off the primary side DC voltage at a predetermined duty ratio, a transformer that transforms the output of the chopper circuit, and an output filter circuit that smoothes the output of the transformer; A drive circuit including a duty control IC that supplies a chopper control signal and a main switch that supplies the secondary side output voltage of the main circuit as a predetermined duty control signal to a duty control signal input terminal of the duty control IC; In the vehicle DC/DC converter, the control IC has a characteristic of decreasing the duty ratio of the chopper control signal supplied to the FET as the duty control signal increases, and the drive circuit controls the duty control IC when the main switch is turned off. A DC/D for a vehicle, which includes a soft-off circuit that temporarily supplies a high duty control signal to the FET, and maintains the FET at approximately 0 duty until the secondary output of the main circuit completely disappears.
C converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12293887U JPH062470Y2 (en) | 1987-08-10 | 1987-08-10 | DC / DC converter for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12293887U JPH062470Y2 (en) | 1987-08-10 | 1987-08-10 | DC / DC converter for vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6430680U true JPS6430680U (en) | 1989-02-27 |
| JPH062470Y2 JPH062470Y2 (en) | 1994-01-19 |
Family
ID=31371333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12293887U Expired - Lifetime JPH062470Y2 (en) | 1987-08-10 | 1987-08-10 | DC / DC converter for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062470Y2 (en) |
-
1987
- 1987-08-10 JP JP12293887U patent/JPH062470Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH062470Y2 (en) | 1994-01-19 |