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How to understand this power circuit [Copy link]

How to understand this power circuit

What are the functions of the three resistors R5, R9 and R10?

How to calculate the voltage at point A

This post is from Power technology

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The voltage at the VZC point is about 4.5. Does VZC mean voltage zero cross?  Details Published on 2023-1-10 17:03
 
 

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How to understand this power circuit?

I don't quite understand it. Pretty weird circuit.

This post is from Power technology

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This is a power failure detection circuit diagram. The leftmost is the secondary winding of the flyback switching power supply.  Details Published on 2023-1-10 17:43
 
 
 

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What are the functions of the three resistors R5, R9 and R10?

I can only ask the original author of the circuit what the function of these resistors is.

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[How to calculate the voltage at point A]

The voltage at point A can only be estimated. The transformer secondary voltage is estimated to be 12V effective, so the peak value is 16.8V. The average value is 10.8V. The voltage at point A is about -15V to ground.

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The voltage at point A is almost 0
This post is from Power technology

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This is a power failure detection circuit diagram. The leftmost is the secondary winding of the flyback switching power supply.  Details Published on 2023-1-10 17:44
 
 
 

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The voltage at the VZC point is about 4.5. Does VZC mean voltage zero cross?
This post is from Power technology
 
 
 

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maychang posted on 2023-1-10 11:40 "How to understand this power supply circuit" I don't quite understand it. It's a very weird circuit.

This is a power failure detection circuit.

The leftmost part of the figure shows the secondary winding of the flyback switching power supply.

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akii posted on 2023-1-10 17:02 The voltage at point A is almost 0

This is a power failure detection circuit.

The leftmost part of the figure shows the secondary winding of the flyback switching power supply.

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oulijit1234 posted on 2023-1-31 23:32 Is it a power-off inspection circuit?

Yes

Any advice?

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