发明名称 |
Electric load drive apparatus |
摘要 |
A current control circuit controls a gate potential of a transistor to equalize a load current IL with a trapezoidal wave signal Sb. The trapezoidal wave signal Sb increases at a constant gradient when a drive command signal Sa turns into H level. Due to increase of load current IL, the transistor starts operating in a linear region and a gate voltage VGS abruptly increases. A saturation state detecting circuit turns a current saturation signal Sc into L level when the gate voltage VGS exceeds a reference voltage Vr. A trapezoidal wave generating circuit stops increase of trapezoidal wave signal Sb. When drive command signal Sa turns into L level, the trapezoidal wave signal Sb decreases at a constant gradient. The load current IL decreases according to reduction of trapezoidal wave signal Sb.
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申请公布号 |
US6545513(B2) |
申请公布日期 |
2003.04.08 |
申请号 |
US20020146741 |
申请日期 |
2002.05.16 |
申请人 |
DENSO CORPORATION |
发明人 |
TSUCHIDA MASAHIRO;UEDA NOBUMASA;FUJIMOTO HIROSHI;KOYAMA YOSHIKI |
分类号 |
H03K4/94;H03K17/042;H03K17/16;(IPC1-7):H03K3/00 |
主分类号 |
H03K4/94 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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