Energy
Storage for
Transmission
Current
Source
Shunt
Regulator
Output
Voltage
AC Line
Voltage
V
A
(8.5V-16V)
V
DD5
(5V)
78L05
AC Line
Voltage
78L05
Raise Input Z
Partial
Temperature
Compensation
V
Input Capacitor
(5V)
DD5
V
(8.5V - 16V)
A
Figure 5.2
Capacitor-Input Power Supply Theory of Operation
Due to the low current available, the application of capacitor-input power
supplies is restricted to nodes which use 0.8µ or smaller geometry Neuron 3120
Chips and which require minimal I/O application current (e.g., latching relays,
SCR triggers, low-power LEDs). Figure 5.3 presents a schematic for a complete
node based on a Neuron 3120 Chip and powered by a capacitor-input power
supply. This node is designed to operate with an internal box air temperature
range of 0-70°C. The coupling circuit shown in this figure is different from those
shown in Chapter 4 to accommodate the unique requirements of this capacitor-
input node.
The schematic contains a table which shows typical and worst-case transmit duty
cycles achievable with 120VAC and 230VAC lines for various capacitor values
and load options. Each of these options provides sufficient energy storage to
transmit one complete 90.7ms packet under worst-case conditions.
Note that
the use of any of these capacitor-input power supply options requires
that the node's configuration data be programmed to enable power
management, as described in Chapter 3.
5-6
Power Supplies for the PLT-22 Transceiver
Summary of Contents for LONWORKS PLT-22
Page 6: ...iv Echelon...
Page 14: ...1 8 Introduction...
Page 67: ...LONWORKS PLT 22 Transceiver s User Guide 5 7 Figure 5 3 Capacitor Input Power Supply Schematic...
Page 92: ...6 10 Design and Test for Electromagnetic Compatibility...
Page 110: ...7 18 Communication Performance Verification...
Page 114: ...8 4 References...
Page 118: ...A 4 Appendix A...
