Realization method of pulse high voltage power supply

Recently, I have met some friends who use pulse power supplies. I found that when they need square wave output, they use full bridge plus transformer, and the secondary directly outputs square wave. I personally think that this method has great defects, such as the primary oscillation will be transmitted to the secondary, making the output waveform very poor; it is difficult to adjust the output duty cycle; when the frequency is relatively low, the transformer is more difficult to design and the volume will become larger; the resistance to short circuit is also quite poor.

The use of high-voltage switches can completely solve the above problems. Use a DC power supply and a switch to achieve pulse output by controlling the on and off of the switch. This switch uses a simple circuit to connect MOS tubes or IGBTs in series. Through a low-inductance and small layout, it can achieve switching of any frequency and pulse width, and has a long life and is easy to maintain.

The switch is composed of a large number of MOSFETs or IGBTs connected in series and parallel in a compact, low-inductance layout. It has a small size and good performance. It contains the drive circuit itself and is a small component with extremely high reliability and excellent switching performance (including low on-resistance, high off-resistance, nanosecond control transmission delay and hundreds of nanoseconds of opening and closing time). At the same time, the full isolation of the control drive circuit and the switch circuit ensures that the switch can be used for high-end switches, low-end switches, and push-pull circuits composed of two high-voltage switches. The use of the switch is also extremely simple. As long as a 5V power supply and a TTL switch control signal are provided, the switch can work under a fixed pulse width or a variable pulse width. The selected devices are all commonly used devices with low cost. The high-voltage switch can be produced in series with a very wide load voltage and current range.

At the same time, the full isolation of the control drive circuit and the switch circuit ensures that the switch can be used for high-end switches, low-end switches, and push-pull circuits composed of two high-voltage switches. The use of the switch is also extremely simple. As long as a 5V power supply and a TTL switch control signal are provided, the switch can work under a fixed pulse width or a variable pulse width. The selected devices are all commonly used devices with low cost. The high-voltage switch can have a very wide load voltage and current range through serialized production.

The overall picture is as follows:

This type of switch can completely replace the direct output method of the transformer, and can also completely replace various trigger tubes, such as vacuum tubes, thyratrons, etc.

Below is the positive power supply high side switch

The negative power supply is connected to the switch at the high end.