Introduction HV9901 universal relay driver employing switching techniq

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Introduction HV9901 universal relay driver employing switching techniq

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HV9901DB1 Universal Relay Driver
Introduction HV9901 universal relay driver employing switching techniques utilizing relay coils inductance provide efficient operation over wide supply voltage range. Relay drive constant-current. Pull-in current, pull-in time, hold current programmable resistors capacitor. adjustable regulator provides external circuitry. HV9901DB1 demo board contains circuitry necessary demonstrate operation HV9901. Included on-board full-wave input rectifier, fuse, HV9901, relay. Provisions connecting external relay available. circuit modified accomodate drive requirements other relays. WARNING!!! connect earth-grounded instruments when connected line. Doing will short line, resulting damage demo board and/or instrument. isolation transformer line, high voltage differential probes, floating instrument make measurements when connected line. Specifications Relay Drive Current Pull-in Time Contact Form Input Voltage 10400VDC, 24277VAC 72mA pull-in, 24mA hold 20ms
Contact Rating
Enable
Auxillary Regulator (VCC)
10A@125VAC, 6A@277VAC <1.5V off, >3.5V 5.0V@1mA
SPDT (1FormC)
Switching Frequency
21kHz
Board Layout Connections
Input Voltage Common
Enable Polarity Selector
Relay Contacts
Normally Closed
Normally Open Relay Selector
WARNING!!! galvanic isolation. Dangerous voltages present when connected line. Input Voltage
External Relay Sync
Enable
Ground
Supply voltage. source range 10400VDC, source range 24277VACrms. full-wave bridge rectifier board rectifies Also included 250mA fuse. Relay Contacts connecting external load. traces rated 20°C rise. Relay Selector position, on-board relay operated. position, relay connected External Relay terminals operated. External Relay connection off-board relay.
Sync Synchronizes multiple HV9901s same frequency master clock. Frequency will highest independent frequency. Connect Sync pins other HV9901s master clock. Enable Logic-level enable relay operation. Enable Polarity Selector polarity.
Supplies external circuitry.
Ground Circuit common. Since galvanic isolation provided, ground will line potential!
Enable Polarity Selector Sets Enable polarity. position, Enable active low. position, Enable active high.
250mA
HV9901DB1 Schematic
DF06
100nF
NAIS JS1-5V RELAY
VREF
ES1J
4.7µF 100nF 1.0µF
VREF
SYNC
226k
1.21M
SYNC VN2450
8.25k
5.0V
1.0µF
374k 124k
270k
Modifications
Connect coil external relay External Relay terminals move Relay Selector shunt position. Pull-in Current, Pull-in Time, Hold Current with other relays, these parameters changed resistors capacitor Refer HV9901 data sheet details. Monitoring Relay Current on-board relay, coil current monitored replacing Relay Selector shunt with either wire loop (for current probe use) with value sense resistor (for voltage probe use). Remember that galvanic isolation provided! warnings first page. External Relay Switching Frequency change switching frequency, change according following equation:
3.23kHz
This equation valid frequencies 25kHz above. advised that frequencies below 20kHz cause relay coil emit audible noise. avoid higher frequencies that approach coils resonant frequency. provided, HV9901DB1 supplies external circuitry. Other volltages range 2.0V 5.5V obtained changing Current rating remains 1mA.
21.8GHz
Note that changing also changes Enable logic levels.
1.25V1
0.3VCC 0.7VCC

Introduction HV9901 universal relay driver employing switching techniq

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