How does Open Frame work?

Open Frame, as the name suggests, is a motherboard that handles power. Power strips are used in many electronic products, including our computers, mobile phones and tablet computers, etc., which use Open Frame.

What is the role of Open Frame?

How does Open Frame work?

What is the workflow of Open Frame?

What is the role of Open Frame?

Open Frame is a functional circuit used in electronic equipment to convert the input power supply voltage (such as power frequency 220V~) into various levels of working voltage (such as 12V-, 15V-) required by electronic circuits, and make it on a circuit board. It is called the power board.

Open Frame is a kind of power conversion circuit. Different from linear power supply, switching power supply has high efficiency, small size and light weight. The average output voltage is adjusted by the on-off time of the switching tube. This power board is called a switching power board.

How does Open Frame work?

1. After the Open Frame is powered on, the secondary power supply first starts to work, providing a positive 5V working voltage for the main circuit board microprocessor control system.

2. After power on, the auxiliary power supply provides VCC-ON power supply for the PFC power factor correction circuit drive control circuit UCC28051 and the main switching power supply drive giant circuit DL A001, and the main switching power supply starts to work, providing positive 24 volts and positive volts to the load circuit of the main circuit board. 12 volts for both voltages.

3. The clutter interference in the mains is filtered out by the anti-interference circuit, and the rectifier, PFC inductance, and filtering output 300V DC voltage to the secondary power supply circuit, and the secondary power supply starts to work and outputs +5v voltage.

What is the workflow of Open Frame?

1. Through the Open Frame output socket port 1 pin to the digital board CPU circuit, the CPU circuit outputs a high-level boot voltage after reading the data and booting.

2. Through the Open Frame socket port 2 to the power supply board voltage regulator switch control circuit, the switch control circuit works, the output voltage is sent to the PFC oscillation circuit, and the high frequency square is output.

The transition pulse drives the PFC switch tube to work, and uses the reverse pulse generated by the PFC inductance.

3. After rectification and filtering, a PFC voltage of 400V is generated. The PFC voltage is sent to the main power circuit and the PFC voltage detection circuit, the PFC detection circuit detects that the PFC voltage reaches 400V, the PFC detection switch circuit outputs the voltage to the main power oscillation circuit, and the oscillation circuit outputs high-frequency square wave pulses to the main power switch tube circuit .

4. The work of the switch tube drives the work of the switch transformer, outputs 2 sets of voltages from the secondary induction, and outputs +12V and +24V voltages after rectification and filtering. At this point, the entire power board startup process is complete.

5. When the TV is in standby, the VCC-ON power supply of the PFC power factor correction circuit drive control circuit UCC28051 and the main switching power supply drive control circuit DL.A00I is cut off, and the main power supply stops working.

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