Hello! I am working on an air purifier but have some questions about the ionization voltage source and was hoping I could find some help. If you could answer some of my questions you would be a bonafide hero to me! Thank you for your time and lending your smarts to help someone out!
The plans I'm looking at can be found here: http://www.freepatentsonline.com/4232355.pdf .
Questions:
“Gate G of the SCR device is initially at zero potential; but when capacitor 21 is charged by voltage V1 through the primary of transformer 20, the potential on the gate of the SCR device rises until the trigger point is reached to render it conductive, thereby abruptly discharging capacitor 21 through the SCR device. This discharge results in a high intensity current pulse through the primary of transformer 20 which shock excites the transformer.”
1. Why does the Gate G of the SCR device control the discharging of Capacitor 21?
2. When Gate G becomes conductive does it completely bypass diodes 18 and 19?
“Transformer 20 is of the open-core ferrite type and it functions as an oscillatory or ringing circuit. Shock excitation is the excitation of natural oscillations in an oscillatory system due to the sudden acquisition of energy from an external source, which in this instance is capacitor 21 when discharged through the SCR device.”
3. What does it mean to “shock excite the transformer?”
4. What is an oscillatory or ringing circuit?
The AC output of transformer 20 is rectified by series-connected diodes 22 and 23 to produce a DC voltage that is filtered by a series chain of capacitors 24. The output voltage wave developed across capacitor 24 is fed through a series resistor 25 whose value determines the output impedance of the source to an output terminal 26 which is connectable to the ionization electrode.
5. What does it mean to “filter” the DC voltage?
6. If the voltage goes through Diodes 22 and 23 to a Series Chain of Capacitors 24 how does it get back to the Series Resistor 25?
Ionization Voltage Source
The plans I'm looking at can be found here: http://www.freepatentsonline.com/4232355.pdf .
Questions:
“Gate G of the SCR device is initially at zero potential; but when capacitor 21 is charged by voltage V1 through the primary of transformer 20, the potential on the gate of the SCR device rises until the trigger point is reached to render it conductive, thereby abruptly discharging capacitor 21 through the SCR device. This discharge results in a high intensity current pulse through the primary of transformer 20 which shock excites the transformer.”
1. Why does the Gate G of the SCR device control the discharging of Capacitor 21?
2. When Gate G becomes conductive does it completely bypass diodes 18 and 19?
“Transformer 20 is of the open-core ferrite type and it functions as an oscillatory or ringing circuit. Shock excitation is the excitation of natural oscillations in an oscillatory system due to the sudden acquisition of energy from an external source, which in this instance is capacitor 21 when discharged through the SCR device.”
3. What does it mean to “shock excite the transformer?”
4. What is an oscillatory or ringing circuit?
The AC output of transformer 20 is rectified by series-connected diodes 22 and 23 to produce a DC voltage that is filtered by a series chain of capacitors 24. The output voltage wave developed across capacitor 24 is fed through a series resistor 25 whose value determines the output impedance of the source to an output terminal 26 which is connectable to the ionization electrode.
5. What does it mean to “filter” the DC voltage?
6. If the voltage goes through Diodes 22 and 23 to a Series Chain of Capacitors 24 how does it get back to the Series Resistor 25?
Ionization Voltage Source
