JPH0224387U - - Google Patents
Info
- Publication number
- JPH0224387U JPH0224387U JP10163688U JP10163688U JPH0224387U JP H0224387 U JPH0224387 U JP H0224387U JP 10163688 U JP10163688 U JP 10163688U JP 10163688 U JP10163688 U JP 10163688U JP H0224387 U JPH0224387 U JP H0224387U
- Authority
- JP
- Japan
- Prior art keywords
- current detection
- coil load
- switching element
- differential amplifier
- input voltage
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Description
第１図は本考案の平均電流検出回路を示す図、
第２図は第１図の平均電流検出回路の動作を説明
するための各部の波形図、第３図及び第４図はそ
れぞれ従来の平均電流検出回路を示す図である。
図中、１…ＣＰＵ、２…出力ポート、３…制御
トランジスタ、４…リニアソレノイド、５…電流
検出用抵抗器、６…フライホイールダイオード、
７…差動アンプ、８…Ａ／Ｄ変換器、９…基準電
源。
FIG. 1 is a diagram showing the average current detection circuit of the present invention.
FIG. 2 is a waveform diagram of various parts for explaining the operation of the average current detection circuit of FIG. 1, and FIGS. 3 and 4 are diagrams showing conventional average current detection circuits, respectively. In the figure, 1... CPU, 2... Output port, 3... Control transistor, 4... Linear solenoid, 5... Current detection resistor, 6... Flywheel diode,
7... Differential amplifier, 8... A/D converter, 9... Reference power supply.
Claims (1)
流をＯＮ・ＯＦＦするスイツチング素子と、前記
スイツチング素子により駆動されるコイル負荷と
、該コイル負荷の逆起電力をコイル負荷に還流さ
れるフライホイールダイオードと、前記還流回路
の途中に挿入された電流検出用抵抗器とを有し、
該電流検出用抵抗器の両端の電位差を差動アンプ
によつて検出する平均電流検出回路において、前
記差動アンプの片側の入力端子をアンプの許容入
力電圧範囲に維持するような基準電源に接続した
ことを特徴とする平均電流検出回路。 A switching element that periodically turns on and off a current using a PWM (pulse width modulation) method, a coil load driven by the switching element, and a flywheel diode that circulates back electromotive force of the coil load to the coil load. , and a current detection resistor inserted in the middle of the freewheeling circuit,
In an average current detection circuit that detects a potential difference between both ends of the current detection resistor using a differential amplifier, one input terminal of the differential amplifier is connected to a reference power supply that maintains the input voltage within the allowable input voltage range of the amplifier. An average current detection circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163688U JPH0224387U (en) | 1988-07-29 | 1988-07-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163688U JPH0224387U (en) | 1988-07-29 | 1988-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0224387U true JPH0224387U (en) | 1990-02-19 |
Family
ID=31330810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10163688U Pending JPH0224387U (en) | 1988-07-29 | 1988-07-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0224387U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100532168B1 (en) * | 1997-04-24 | 2006-01-27 | 산요덴키가부시키가이샤 | Current detecting circuit having a automatic correlation circuit of offset voltage |
| JP2008078680A (en) * | 2007-11-05 | 2008-04-03 | Komatsu Ltd | Solenoid drive device |
| JP2011010512A (en) * | 2009-06-29 | 2011-01-13 | Denso Corp | Step up/down converter |
| JP2012105274A (en) * | 2010-11-08 | 2012-05-31 | Visteon Global Technologies Inc | Inrush current limiter circuit for driver module |
-
1988
- 1988-07-29 JP JP10163688U patent/JPH0224387U/ja active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100532168B1 (en) * | 1997-04-24 | 2006-01-27 | 산요덴키가부시키가이샤 | Current detecting circuit having a automatic correlation circuit of offset voltage |
| JP2008078680A (en) * | 2007-11-05 | 2008-04-03 | Komatsu Ltd | Solenoid drive device |
| JP2011010512A (en) * | 2009-06-29 | 2011-01-13 | Denso Corp | Step up/down converter |
| JP2012105274A (en) * | 2010-11-08 | 2012-05-31 | Visteon Global Technologies Inc | Inrush current limiter circuit for driver module |
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