News Release

- New Product Information -

2019/08/27
AKM releases ultra-high accuracy unipolar coreless current sensor supporting 60Arms with more than 8mm of Creepage / Clearance Distance

Product Name
CZ-372x (x: 0 to 6)
Product Category:
Current Sensors > Ultra-high Accuracy Coreless Current Sensors
Title
Ultra-high accuracy coreless current sensor
Supporting 60 Arms
Creepage / Clearance Distance > 8 mm
Applications
Power Conditioner (DC side)
Overcurrent Detection of Industrial Equipment
CZ-372x
CZ-372x

Description

Asahi Kasei Microdevices Corporation (AKM) has released the CZ-370x series of 60 Arms bipolar detection coreless current sensors that are intended for use in phase current detection of inverters and AC servo motors. In addition to these applications, AKM develops new CZ-372x series of coreless current sensors of the unipolar detection type for power conditioner (DC side). When measuring current flowing in one direction, higher SNR can be achieved compared to the bipolar detection type.

Features

● Creepage / Clearance Distance > 8 mm

By developing AKM’s original package, both creepage distance and clearance distance of 8 mm or more are achieved. It supports a Working Voltage of 600 Vrms (with reinforced insulation), making insulation design easy.


● Supports 10.3 to 345.2 App and 60 Arms Low-heat Generation

The CZ-372x series has a low resistance of 0.27 mΩ as the primary conductor resistance with AKM’s original package. As a result, compared to shunt resistors and similar products of other companies, heat generation when applying the current can be greatly suppressed, and 60 Arms continuous current can be applied.
Furthermore, availability with wide current detection ranges from 10.3 App (CZ-3720) to 345.2 App (CZ-3726) is achieved. This enables to adopt a common design of system boards, making it easy to roll it out to other models with different ratings.


● Ultra-High Accuracy

The CZ-372x series is ultra-high accurate coreless current sensor with 1.0% F.S. (typical). In addition, it has a built-in stray magnetic field reduction function, a challenge for conventional coreless current sensors, contributing to improvement of system efficiency and precise control in a wide range of applications.

Unipolar Detection CZ-372x series' Specifications

Product NameLinear Sensing Range
(A)
Sensitivity
(mV/A)
Temperature Drift of Sensitivity
(%) *1
Temperature Drift of Zero-Current Output
(mV) *1
Total Accuracy
(%F.S.) *2
Response Time
(μs)
CZ-3720 -0.4 to 10.3 400




±0.6
±5.4


1.0
(Typ.)

-0.9 to 1.6
(Min. to Max.)





1
CZ-3721 -0.8 to 20.6 200 ±4.4
CZ-3722 -1.7 to 41.3100±3.8
CZ-3723 -2.9 to 68.860±3.6
CZ-3724 -4.4 to 103.440±3.5
CZ-3725 -7.1 to 165.825±3.5
CZ-3726 -14.9 to 345.212±3.4
*1  It is defined as the "average value ± 3σ" of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.
*2  The typical value is defined as the “average value ± 1σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.  In the same manner, the minimum and maximum values are defined as the “average value ± 3σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.

Bipolar Detection CZ-370x series' Specifications  (released in October 2018)

Product NameLinear Sensing Range
(A)
Sensitivity
(mV/A)
Temperature Drift of Sensitivity
(%) *1
Temperature Drift of Zero-Current Output
(mV) *1
Total Accuracy
(%F.S.) *2
Response Time
(μs)
CZ-3700 ±5.3 400




±0.6
±5.4


0.5
(Typ.)

-0.4 to 0.8
(Min. to Max.)





1
CZ-3701 ±10.7 200 ±4.4
CZ-3702 ±21.5100±3.8
CZ-3703 ±3660±3.6
CZ-3704 ±5440±3.5
CZ-3705 ±86.425±3.5
CZ-3706 ±18012±3.4
*1  It is defined as the "average value ± 3σ" of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.
*2  The typical value is defined as the “average value ± 1σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.  In the same manner, the minimum and maximum values are defined as the “average value ± 3σ” of the actual measurement result (Ta = 0 to 90 °C) in a certain lot.

[Notes]
* Information on this page is current on the date of press release.
* AKM is a trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Currentier is a trademark of Asahi Kasei Microdevices Corporation (under registration review).

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