On the whole,
China mass-produces various switching power supplies.
One of the application areas is chargers.
Among them, the core integrated circuit chips
are basically imported.
There are also companies that produce switching power supplies.
In order to reduce costs,
With domestic imitation chips,
there is only a small market for low-end products on the market.
From the analysis of skilled engineering and technical personnel of switching power supply,
Their answer to this question is to replace the pulse transformer,
< p>The power supply voltage is different,The size and air gap of the ferrite core of the pulse transformer remain unchanged,
Only the number of turns of the primary winding is different,
< p>Specifically, it requires repeated revisions after actual comparative testing and experiments.Only before it can be applied in practice.
To comprehensively answer this question,
the first step is to manufacture a switching power supply with a wide input power supply voltage.
Use China's high-end engineering technology to manufacture switching power supplies. personnel capabilities,
They suggest using a chip that can adjust both the oscillation frequency and pulse duty cycle.
This kind of chip is the most popular in China. There are also imitations.
Most switching power supply chips are chips that adjust the pulse duty cycle.
The actual problem with this question is that no matter what kind of chip,
it is difficult for the chip to obtain the initial startup current from the power supply.
Based on domestic and foreign standard designs,
a resistor is used to obtain the initial startup current of the chip.
And if this resistor is to be adapted to such a wide Input power supply voltage range,
The resistance of this resistor is determined according to the lowest input power supply voltage,
And when the input power supply voltage is the highest,
The power consumption on this resistor is extremely high,
The entire device has low efficiency, poor reliability, and increased temperature.
If the capacitive reactance of the capacitor is used to limit the current, the loss can be reduced.
It cannot be applied to the requirements of DC power input.
Moreover, the capacitor operates under high voltage conditions. When working under low conditions,
there is a chance of breakdown and short circuit, and the reliability is poor.
This is the design technique of high-performance, high-efficiency, high-reliability, and micro-power consumption circuits.
It is the basic skill in the aerospace field and military industry.
China Aerospace Industry Corporation does not have this capability,
It cannot reach this threshold.
I have already successfully manufactured related devices from two different approaches and have put them into practical use for many years.
Because before the reform and development,
I completely used domestic discrete semiconductor devices,
achieved an input power AC voltage effective value of 220V,
The peak power reaches kilowatts,
Wide-range frequency modulation, width modulation switching power supply,
Complete the testing work in accordance with the requirements of the International Electrotechnical Organization IEEE standards.