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UM0277 Datasheet(PDF) 12 Page - STMicroelectronics

Part # UM0277
Description  Getting started with the Cold Thermostat Kit based on AC switches and ST7LITE MCU
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0277 Datasheet(HTML) 12 Page - STMicroelectronics

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Getting started
UM0277
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3.3
Pulse control
All loads are controlled in full cycle mode by a pulsed gate current. The MCU senses both
the mains rising and falling edges to synchronize the gate pulse with the mains supply. Their
delays and widths can be adjusted using the GUI from 0 to 4 ms in order to ensure a correct
control of loads (especially in case of different phase shift for the compressor than the
default value: 0.5 to 1.5 ms). Figure 6 shows the different times useful to understand when
the gate current pulses are applied for the three AC switches (Q1, Q2 and Q3):
●
T1 is the mains voltage / compressor current phase shift. It helps to apply the gate
current pulse just when the Q1 current reaches zero, in order to control the compressor
in full cycle mode. Rq: a higher delay could be applied to test the compressor in phase
angle mode.
●
T3 is the gate current pulse width for switch Q1 (compressor)
●
T2 is the gate current pulse width for switches Q2 and Q3 (light bulb and defrost
resistor)
Figure 6.
Timing definition for gate current pulses
Note:
The gate currents are negative (i.e. they are sunk from the gates).
Table 4.
Measurement points
Footprint Name
Description
LLine
NNeutral
VDD
+5V power supply (also connected to ACS/ACST cathodes)
GND
GND power supply
ZVS
Zero Voltage Signal at MCU Input
NTC-
NTC value at MCU Input
RUN
Gate control of the ACST6 (compressor) at MCU Output
LIGHT
Gate control of the ACS102 (light bulb) at MCU Output
DEFROST
Gate control of the ACS110 (Defrost) at MCU Output
Gate current (Light bulb / Defrost or Fan)
AC Mains
Gate current (Compressor)
T2
T1
T3
T2
t (s)
t (s)
t (s)
T3
T1
T2
IICOMPRESSOR
Gate current (Light bulb / Defrost or Fan)
AC Mains
Gate current (Compressor)
T2
T1
T3
T2
t (s)
t (s)
t (s)
T3
T1
T2
Gate current (Light bulb / Defrost or Fan)
AC Mains
Gate current (Compressor)
T2
T1
T3
T2
t (s)
t (s)
t (s)
T3
T1
T2
IICOMPRESSOR
Gate current (Light bulb / Defrost or Fan)
AC Mains
Gate current (Compressor)
T2
T1
T3
T2
t (s)
t (s)
t (s)
T3
T1
T2



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