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Electric
Vehicle Systems
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Isolation between the high voltage
connections and chassis ground are monitored
using the ISO recommended method and
limits. An LCD display shows the output
voltage and current, along with status
information. A 12V safety loop output must
be connected, and isolation must be ok
before a drive to the battery pack
contactors is enabled. Control is by
pushbuttons for bench rig safety use, or CAN
for in vehicle use. |
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A
280V to 14.2V 40A DC-DC convertor to provide
the equivalent of an alternator output on
electric vehicles. Built for a one off
electric Elise. |
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A well-known production electric sports car
uses a PTC heating element to provide cabin
heating. Abbeygate designed the controller
and brought it into production. It is in use
in the car today. The electronics is powered
from 450VDC, and features current limiting
to prevent high inrush due to the nature of
PTC elements (low resistance when cold). It
is driven by a 100Hz PWM signal and detects
a stuck on input, so that risk of over
heating is reduced. It uses economical parts
and incorporates an isolated serial output
port for system diagnostics. |
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Cell
SOC and balance controller
(in progress) |
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Using the Analog Devices battery
conditioning chips. |
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HVAC controller |
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A
controller to provide air-conditioning and
heating control using a DC compressor for
electric vehicles. It operates on 12 or 24V
battery systems and as well as providing
full air-conditioning control also generates
the PWM signal for a PTC based heater.
Simple operation or full climate control is
possible. It features a CAN bus and an SD
card slot for logging capability. |
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400V LED
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A
simple circuit which lights an LED if a
voltage in the range of 50 to 500V is
applied. It is used on electric vehicles to
indicate if the HV systems are live. |
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