Nano-second pulse generator with adjustable pulse width and output impedance

Abstract

The invention discloses a nano-second pulse generator with adjustable pulse width and output impedance, which is mainly composed of a direct current power supply, a pulse generation circuit, a drive circuit and a trigger circuit. The pulse generation circuit comprises a Blumlein type pulse forming line, a MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) and a load; the pulse forming line comprises a first transmission line and a second transmission line, which are coaxial lines and are connected with a circuit board of the pulse generation circuit through a BNC or SMA interface; the MOSFET is connected between an inner conductor and an outer conductor at one end of the first transmission line through a source electrode and a drain electrode; the direct current power supply is connected with the inner conductor at the end of the first transmission line; and the trigger circuit is connected with a grid electrode of the MOSFET through the drive circuit. According to the invention, the double-transmission line Blumlein type pulse forming line is adopted, and the MOSFET is used as a high speed switch, thus, high-frequency nano-second pulse output can be realized, moreover, the output impedance and the pulse width of the power supply are adjustable.

Description

technical field [0001] The invention relates to the fields of analog electronics and power electronics, in particular to a nanosecond pulse power supply with adjustable pulse width and output impedance. Background technique [0002] The concept of Blumlein-type pulse formation line was proposed by A.D. Blumlein in 1948, also known as double formation line. Compared with the single forming line, it can obtain pulses with an amplitude equal to the charging voltage, while the single forming line can only obtain pulses with an amplitude equal to half of the charging voltage. Blumlein-type pulse forming lines are divided into double transmission line types (such as Figure 1A shown) and compact (as Figure 1B shown) two. The Blumlein pulse forming line power supply in the prior art mostly adopts a compact Blumlein pulse forming line. For example, the patent of publication number CN102931948 discloses a high-voltage sub-nanosecond pulse source of a gas switch and a compact Bluml...

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Problems solved by technology

Since the design uses a gas switch, the discharge pulse frequency will not be very high, and the length and impedance of the forming line are not adjustable, which is also the shortcoming of the compact Blumlein type pulse forming line

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