UM1542 datasheet(21/43 Pages) STMICROELECTRONICS

Part #	UM1542

Description	Cold thermostat kit based on AC switches and the STM8S003F3

PDF	43 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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21 / 43 page

UM1542

Using the STEVAL-IHT001V2 thermostat kit

Doc ID 023172 Rev 1

21/43

Figure 7.

GUI - temperature control tab

3.6.2

Timing control tab

This section (Figure 8) controls the gate current width for the AC switches, the delay to

switch ON the AC switches Q1 (for compressor) and Q3 (for fan), the ZVS delay, the delay to

activate defrost and the defrost duration. These parameters are sent and received by

clicking on the “Set” or “Get” buttons, respectively. Note that the default parameters are

given in Appendix G, and they can be retrieved by clicking on the “Restore Default” push

button.

Figure 8.

GUI - timing control window

The ZVS delay is the delay between the AC mains zero voltage and the detection of this

zero voltage by the MCU in order to synchronize the MCU orders with the AC mains voltage.

The MCU uses the zero-voltage crossing (ZVC) events to synchronize the AC switches gate

current pulses.

UM1542 Datasheet(PDF) 21 Page - STMicroelectronics