Power supply control device and method

a control device and power supply technology, applied in the direction of process and machine control, pulse technique, instruments, etc., can solve the problems of large packaging space, poor response of microcomputer basis control to such abnormal current, and failure to opera

Inactive Publication Date: 2001-08-02
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, those fail to operate when a layer short, e.g., an imperfect short having some short resistance, occurs and small short current flows.
A response of the MICROCOMPUTER basis control to such an abnormal current is poor.
Since the shunt resistor RS, the MICROCOMPUTER 903 and the like are indis...

Method used

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  • Power supply control device and method
  • Power supply control device and method

Examples

Experimental program
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Effect test

first embodiment

[0048] First Embodiment

[0049] A power supply control device, which forms a first embodiment of the present invention, will be described in accordance with FIG. 1. The power supply control device is arranged such that a drain (D)--source (SA) path of a main control FET QA as a semiconductor switch is inserted in a series fashion in a path for supplying an output voltage VB of a power supply 101 to a load 102. In this instance, the main control FET QA is an NMOS FET having a DMOS structure. If required, it may be a PMOS FET.

[0050] In the figure, a circuit section for driving and controlling the main control FET QA includes a reference FET (second semiconductor switch) QB, resistors R1 to R12, and RG, a Zener diode ZD1, diodes D1 to D3, transistors Q1 to Q4, a comparator CMP1, a drive circuit 111, and a switch SW1. In the specification description to follow and the accompanying drawings attached thereto, the resistors are denoted as R followed by reference numerals and characters. Thos...

second embodiment

[0100] Second Embodiment

[0101] A power supply control device and method, which forms a second embodiment of the present invention, will be described with reference to FIG. 5. The power supply control device of the embodiment is characteristically featured in that the Reference current generating device is constructed as a constant current source. Specifically, difference of the circuit arrangement (FIG. 1) of the power supply control device of the first embodiment is that a resistor R13 is inserted between the resistor R11 and the collector of the transistor Q1 in the Reference current generating device, and a Zener diode ZD2 is connected between the other end of the resistor R13 and ground potential. In FIG. 5, a circuit section 110b enclosed with a dotted line indicates a circuit section to be analog integrated onto a chip (this section will be referred to a chip-circuitry section).

[0102] In the circuit arrangement, the collector current IC (Q3) is given by

IC(Q3)={VZD2-(on-voltage...

first modification

[0107] First Modification

[0108] The first modification is characteristically featured in that a inrush current mask circuit 105 as shown in FIG. 6 is additionally used to the circuit arrangement (FIG. 1 or 5) of the power supply control device of the first or second embodiment.

[0109] When the load 102 (e.g., head lights) is turned on, in rush current flows, which is several to several tens times as large as a normal current in amplitude. The period that the inrush current flows depends on the type and capacity of the load 102, but is about 3 msec to 20 msec. If the overcurrent control as described in the first or second embodiment is carried out during the surge-current flowing period, some time is taken till the load is settled down into a stationary state. As a result, the response of the load per se delays sometimes. Specifically, the headlights are delayed in lighting. The embodiment solves this problem by adding the inrush current mask circuit 105 (corresponding to prohibiting ...

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PUM

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Abstract

When the supply of electric power from a power supply (101) to a load (102) is controlled in a switching manner by a semiconductor switch (QA), reference current generating device (R11, Q2, Q3) generates a reference current, and reference voltage generating device (QB) generates a reference voltage (VDSB) based on the reference current. Detector CMP1 detects a difference between a terminal voltage (VDSA) of the semiconductor switch (QA) and the reference voltage, and the semiconductor switch (QA) is on/off controlled in accordance with the difference between the terminal voltage (VDSA) of the semiconductor switch (QA) and the reference voltage.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a power supply control device and method. More particularly, the invention relates to a power supply control device having a semiconductor switch which is controlled in accordance with a control signal supplied to a control signal input terminal to control the supply of electric power from a power supply to a load under the switching control, and a power supply control method in use for the power supply control device.[0003] 2. Related Art[0004] The power supply control device with a semiconductor device, which arranged as shown in FIG. 8 is known. This power supply control device, which is used in a vehicle, selectively supplies electric power source from a battery to respective loads, and controls the power supply to the load.[0005] As shown, the related power supply control device is arranged such that a shunt resistor RS and a drain (D)--source (S) path of a thermal FET QF are connected in series in a power ...

Claims

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Application Information

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IPC IPC(8): G05F1/10H02J1/00G05F1/56H03K17/08H03K17/082
CPCH02M2001/0009H03K17/0822H03K2017/0806H02M1/0009
Inventor OHSHIMA, SHUNZOU
Owner YAZAKI CORP
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