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AC/DC-SENSITIVE DIFFERENTIAL CURRENT SENSORS (DI-SENSORS)

Applications of the Current Sensors

Control devices with all-current sensitive differential current sensors are used primarily in transformerless solar or traction inverters. Also in EV charging infrastructure and charging devices in general, DI sensors can be used.

An important safety function of these devices is the monitoring of the leakage currents against earth of the entire system. This leakage current contains DC and AC components. Therefore an AC/DC-sensitive monitoring unit is necessary. Their heart is the VAC differential current sensor, whose output voltage is evaluated by the control system of the solar inverter. In EV charging applications the sensor can be used to directly drive the power contactors.

Characteristics of Inverter Sensors:

  • closed loop sensors with magnetic probe for highest accuracy and reliability
  • differential current range typically 30 mA, up to 1000 mA
  • full load current to 85 A
  • single +5 V voltage supply
  • voltage output for direct connection at A/D-converters
  • automatic demagnetization of the sensor core for offset decrease
  • self-monitoring and test functions
  • measuring accuracy 1.5%
  • smallest temperature drift, highest long-term stability
  • magnetic shielding against external fields
  • frequency range DC to 10 kHz
  • variants with pass-through opening or with integrated primary conductors
  • variant with or without test winding
  • cost effective design

Characteristics of EV Sensors:

  • fault current detection according to IEC 62752 or UL 2231
  • frequency range DC up to 2 KHz
  • open collector output for each tripping level
  • integrated self-monitoring and test functions
  • measurement resolution of 0.2 mA
  • variants with pass through opening or with integrated primary conductors
  • robust mechanical design suitable for IC-CPD
  • widely usable in harsh electronic environment

Sensor variants:
 
The following types are available:
• variants with pass through opening
• variants with two, three or four integrated primary conductors for PCB mounting
• variants with integrated test-current pin (PV variants only)

Further product information can be found in our brochure All-current Sensitive Differential Current Sensors (AC/DC DI-Sensors).

VAC-product

Acc. to
Standard

Tripping level

Primary
conductor

Number of primaries

T60404-N

I [mA]

4641-X900  
         X901

IEC62752 
UL 2231

6 mA DC and 30 mA rms
5 mA rms and 20 mA rms

pass through opening

-

4641-X910  
         X911

IEC62752 
UL 2231

6 mA DC and 30 mA rms
5 mA rms and 20 mA rms

conductor ∅ 1.8 mm

2 or 3

4641-X920 
         X921

IEC62752 
UL 2231

6 mA DC and 30 mA rms
5 mA rms and 20 mA rms

conductor ∅ 2.5 mm

4

VAC-product

IPN

IΔN

IΔN, max

VC

Test pin
integrated

Output voltage
@ IΔP

Primary
conductor

Number of
primaries

T60404-N

A

mA

mA

V

Y / N

V

4646-X911

50*

300

850

5

Y

VREF + (0.74 * IΔP/IΔN)

pass through opening

 -

4646-X921

50

300

850

5

Y

VREF + (0.74 * IΔP/IΔN)

conductor ∅ 2.8 mm

2

4646-X931

85

1000

1700

5

Y

VREF  + (1.2 * IΔP/IΔN)

conductor ∅ 4.5 mm

4

4646-X932

50

300

850

5

Y

VREF +  (0.74 * IΔP/ IΔN)

conductor ∅ 2.8 mm

4

4646-X934

50

1000

1700

5

Y

VREF +  (1.2 *  IΔP/IΔN)

conductor ∅ 2.8 mm

4

4646-X950

50*

300

850

5

N

VREF +  (0.74 *  IΔP/IΔN )

pass through opening

-

4646-X951

50*

150

270

5

N

VREF +  (1.185 * IΔP/IΔN)

pass through opening

-

4646-X956

50*

300

850

5

Y

VREF +  (0.74 *  IΔP/IΔN)

pass through opening

-

4646-X960

50

300

850

5

N

VREF +  (0.74 *  IΔP/ IΔN)

conductor ∅ 2.8 mm

2

4646-X970

50

300

850

5

Y

VREF +  (0.74 *  IΔP/IΔN)

conductor ∅ 2.8 mm

2

4646-X975

50

300

850

5

Y

VREF +  (0.74 *  IΔP/IΔN)

conductor ∅ 2.8 mm

2

4646-X976

50

300

850

5

Y

VREF +  (0.74 *  IΔP/IΔN)

conductor ∅ 2.8 mm

 4

* Information about maximum primary current is a guideline only

Notes:

IPN = primary nominal rms current
IΔN = nominal differential current
IΔN, max = max. measurable differential current
VC = supply voltage
IΔP = measured value of the differential current
VREF = reference voltage = 2.5 V

Further current sensor-types, e.g. for higher currents and with integrated electronics or passive modules for the use with external electronics can be found here:

Active Current Sensors for Maximum Accuracy
Passive Current Sensors for operation with the IC DRV 401

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Last update: 27.09.2018