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Current detection circuit and power supply unit

A current detection circuit and current technology, applied in the direction of measuring devices, measuring current/voltage, and only measuring current, can solve the problems of deterioration of current detection accuracy

Active Publication Date: 2021-05-28
AUTONETWORKS TECH LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a voltage drop due to the use of diodes, which has a temperature characteristic
Therefore, in a configuration in which the magnitude (threshold) of the detected voltage is set based on the voltage drop of the diode, the threshold fluctuates, and the accuracy of current detection may deteriorate.

Method used

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  • Current detection circuit and power supply unit
  • Current detection circuit and power supply unit
  • Current detection circuit and power supply unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Hereinafter, Example 1 in which the present invention is embodied will be described.

[0063] figure 1 The illustrated vehicle-mounted power supply system 100 (hereinafter, also referred to as the system 100 ) constitutes a power supply system for supplying electric power to the vehicle-mounted load 13 (hereinafter, also referred to as the load 13 ). Such as figure 1 As shown, the system 100 includes a main power supply unit 11 , an auxiliary power supply unit 12 , a load 13 , a power path 14 , a power supply device 10 , a control unit, and the like. The main power supply unit 11 is a main power supply source for the load 13 . The auxiliary power supply unit 12 is a power supply source different from the main power supply unit 11 . The power path 14 is a power supply path between the main power supply unit 11 , the auxiliary power supply unit 12 , and the load 13 . The power supply device 10 includes a vehicle-mounted DCDC converter 20 (hereinafter also referred t...

Embodiment 2

[0095] Next, Example 2 will be described.

[0096] The system 100 of the second embodiment differs from the first embodiment mainly in the structure of the first output unit 240 and the second output unit 250 of the current detection circuit 30 . In addition, the structure other than that is the same as that of Example 1. Therefore, in the following, the same reference numerals as in the first embodiment are attached to the parts having the same configuration as the first embodiment, and the detailed description is omitted, and the differences from the first embodiment are mainly explained.

[0097] Such as image 3 As shown, the current detection circuit 30 of Embodiment 2 includes a first sensor 31, a second sensor 32, a first signal path L1, a second signal path L2, a first output unit 240, a second output unit 250, resistors 33-36 , comparator 37 and so on. The first output unit 240 includes a diode 241, a diode 242, and a third signal path L3. The diode 241 correspond...

Embodiment 3

[0111] Next, Example 3 will be described.

[0112] The system 100 of the third embodiment is mainly that the first voltage dividing circuit 311 is arranged between the first sensor 31 and the first signal path L1, and the second voltage dividing circuit 321 is arranged between the second sensor 32 and the second signal path L2. Point is different from Example 1. In addition, the structure other than that is the same as that of Example 1. Therefore, in the following, the same reference numerals as those in the first embodiment are attached to the parts having the same configuration as the first embodiment, and detailed descriptions are omitted, and the differences from the first embodiment are mainly explained.

[0113] Such as Figure 4 As shown, the current detection circuit 30 of Embodiment 3 includes a first sensor 31, a second sensor 32, a first voltage dividing circuit 311, a second voltage dividing circuit 321, a first signal path L1, a second signal path L2, a first ...

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Abstract

The present invention relates to a current detection circuit and a power supply device, capable of reducing the number of parts and detecting current with high precision. A current detection circuit (30) detects the current flowing in the DCDC converter (20). The first output unit (40) applies a voltage corresponding to an output from a detection sensor that detects a large current among the first sensor (31) and the second sensor (32), to the third signal path (L3). Furthermore, the first output unit (40) transmits a voltage reflecting a voltage drop of elements connected to the detection sensor among the transistor (41) and the transistor (42) to the third signal path (L3) with respect to the output voltage from the detection sensor. ) applied. The second output unit (50) supplies to the fourth signal path ( L4) applied.

Description

technical field [0001] The invention relates to a current detection circuit and a power supply device. Background technique [0002] A power supply device for vehicles uses a DCDC converter that boosts or steps down a DC voltage to convert it to a desired DC voltage. In such a DCDC converter, a structure capable of detecting the magnitude of the current flowing in the conduction path on the input side and the output side with high precision is required. For example, the overcurrent detection circuit disclosed in Patent Document 1 has a configuration in which a voltage obtained by dividing an input voltage of a load device by a diode and a voltage dividing resistor is applied as a base bias to the base of a transistor. When an overcurrent flows in the power supply path and the voltage across the current detection resistor is greater than the voltage across the divider resistor, the transistor is biased in the forward direction and turned on, and the overcurrent detection sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02M3/00G01R19/32
CPCH02M3/00G01R19/32H02M1/0009H03K2217/0027G01R19/0092H02M1/009H02M3/156
Inventor 上妻健太郎杉泽佑树
Owner AUTONETWORKS TECH LTD