Safe Interlock Unit

Products

Safe Interlock Unit

Safely design interlock circuits of electric vehicles with the Safe Interlock Unit SIU

The SIU is a state-of-the-art, stand-alone interlock generator and measuring device used to protect against electric shocks in electric vehicles and machines. The interlock status is communicated via CAN and redundantly as a digital output.

01.

Reliable fault detection

Detects all possible faults in the interlocking system and meets the highest safety requirements.

02.

Meaningful measurement data

Measures the resistance in the locking circuit with exceptional accuracy and can warn of changes.

03.

Expandable functionality

Can be integrated into your HV components as a barbone board and expanded with additional functions if required.

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The high-voltage interlock is an important safety feature in electric vehicles that ensures that the high-voltage system is only activated when it is safe to do so.

By preventing dangerous situations, the high-voltage interlock protects both the occupants of the vehicle and anyone else who might come into contact with it.

Tech Specs

Technical Drawing

Norms and Regulations

  • AECQ-100 automotive compliant

  • ISO 6469-3:2018 compliant

  • ASIL Ready, ISO 26262 on request

  • ISO 20653 IP6K9K (with housing)

  • ECE R10 compliant on request

Specifications

  • From 1 to 3 independent interlock circuits

  • Redundant measurement

  • Comprehensive fault diagnosis of the interlocking loop: short circuit to GND, short circuit to battery, open loop, IL resistor

  • Current-controlled interlock PWM

  • Adjustable duty cycle and frequency

  • Limited short-circuit current, sink & drain

  • Wide-range supply (8-32V)

  • Wakeup-Time <100ms

  • Secured CAN2.0B interface, 500 kBaud

  • Configurable auxiliary outputs*

*Number and available functions depend on the hardware configuration

Order information

Connector (not included)

1x plug
German DTM06-12SA

12x contact
German 1062-20-0122

1x CPA
German WM-12S

12x sealing plug
German 0413-204-2005

1x sleeve
German DTM12S-BT

Schematic diagram

Pinning LV connector X1

(1) Ground (K31): Supply GND

(2) Supply (K30): Supply, 8-32V, always on

(3) Wake up (K15): Wake up, 8-32V

(4) Il Out: Interlock output

(5) Il_Fb: Interlock feedback

(6) CAN_L: High-side status output, supply voltage level, max 100mA

(7) CAN H: Locking circuit 1 output to the vehicle

(8) Aux 1: Configurable input/output 1

(9) Aux 2: Configurable input/output 2

(10) Aux 3: Configurable input/output 3

(11) Aux 4: Configurable input/output 4

(12) Aux 5: Configurable input/output 5

Sequence diagram

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