Pre-Packaged Spike & Hold Circuit



  • Easy hook-up terminal connections
  • User adjustable spike times from
    0.1 to 5 milliseconds
  • Automatic reduced power consumption and lower operating temperature
  • High initial voltage for fast response time without excess heat
  • Up to 40 volt spike voltage
  • Simplifies circuitry for accurate valve dispensing


PART NUMBER
SPIKE TIME ADJUSTMENT RANGE
IECX0501350A
0.1 to 5 ms. (Factory Pre-set 0.30 ms)
IECX0501500A
1 to 100 ms. (Factory Pre-set 50 ms)

Lee Engineering has designed the spike and hold driver to assist a developer in producing precision fluid dispense volumes from Lee valves. This unit is fully assembled and requires minimal knowledge of electronics. Its use ensures optimized fluid dispensing while reducing the risk of overheating Lee valves. The driver is pre-tuned to apply precise sculpted power pulses to the valve. This allows a developer to easily experiment with various valve actuation times and/or frequencies to attain fast and precise fluid dispense capabilities.

The Lee VHS valve requires a spike of power to actuate (this also reduces the response time). This power level will generate more heat than the valve can safely dissipate. After the valve has opened, the voltage must be reduced to prevent permanent damage to the valve.

Standard VHS valves require the spike voltage (sometimes referred to as pulse voltage) for 0.30 ms to open the valve. The specific minimum spike time, spike voltage and hold voltage is specified on the inspection drawing (available from The Lee Company) for each valve.

The drive circuit module (IECX0501350A) provides a safe operating voltage profile for the Lee VHS valves. This module converts a TTL control signal into a spike and hold voltage, which is usable by the VHS valves.

For valves requiring a spike duration longer than 5.0 ms, drive circuit module IECX0501500A is available.

Features:
  • Automatic timed drop-out from initial "spike-voltage" to a lower "holding-voltage" to reduce power consumption and lower operating temperature.
  • High initial voltage allows valves to be operated with a reduced response time and without excessive heat build up.
  • User adjustable spike times from 0.1 to 5 ms.(IECX0501350A) or from 1 to 100 ms (IECX0501500A).
  • For use with valves requiring up to a 40 volt spike.
  • Easy hook-up terminal connections.
  • Simplifies circuitry requirements for accurate valve dispensing.

(INIX0500200A driver instructions Link here)

Block diagram of circuit operation*

Fig. 1

Figure 1 shows the operation of the spike and hold circuit. The function generator outputs a TTL signal (0-5 volts pulse), which acts as the control (or trigger) voltage. The on time, duty cycle and operating frequency of the valve are determined by this input signal.

When the control signal is low (at 0 volts), the circuit and valve are not energized. When the signal is high (5 volts), the circuit energizes the spike timer and the hold voltages to the valve. The spike timer is factory preset at 0.30 ms (50.0 ms on IECX0501500A). After the spike period, the circuit turns off the spike voltage and leaves the hold voltage energized for as long as the control signal remains high. When the control signal decreases, all power to the valve is turned off, regardless of the spike timer status.

*note; Function Generator (i.e., Pulse Generator, P.C.) and 2 power supplies are required for the circuit operation. These items are to be provided by the end user.

For more information, please send us your application information via our ASK LEE service. Or contact our application engineers in the USA at 1-800-LEE-PLUG or our representatives around the world.
Copyright 11/2009 by The Lee Company, USA
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