RU205307U1 - Controlled nanosecond pulse generator - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to a driver device, and can be used in the design of voltage converters for generating pulses of power supply of various loads, for example, a gate of a field-effect transistor, a winding of a pulse transformer, etc. A controlled nanosecond pulse generator containing a gate driver that includes a direct input the driver inverting the driver input and the driver output additionally contains a circuit for creating a high voltage level at the direct input of the driver and a control device connected to the direct input of the driver, and the output of the driver is closed to the inverting input of the driver. The technical result of the utility model is the creation of a controlled generator of nanosecond pulses by forming nanosecond pulses using a gate driver without using a PWM controller or digital microcontroller.

Description

The utility model relates to electrical engineering, in particular to a driver device, and can be used in the design of voltage converters to generate pulses for supplying various loads, for example, a gate of a field-effect transistor, winding of a pulse transformer, etc.

Known device LM5112 (products of Texas Instruments; https://www.ti.com/lit/ds/symlink/lm5112.pdf), which is a high-speed single-channel gate driver of a field-effect transistor with a high output peak current (7A). The high output current of the LM5112 turns the FET on and off with short rise and fall times, thereby significantly reducing switching losses. The LM5112 includes both direct and inverting inputs, which provide the flexibility to drive the FET with logic low or high.

Known device FAN3100C (products of ONSemiconductor; https://www.onsemi.com/pub/Collateral/FAN31 OOT-D.PDF), which is a gate driver for a field-effect transistor for applications that require its switching from the lower side by providing high peak current pulses during short switching intervals. The internal circuitry of the FAN3100C also contains an undervoltage blocking function.

The closest to the proposed utility model is the MAX5048C device (products of MaximIntegrated; https://datasheets.maximintegrated.com/en/ds/MAX5048C.pdf), which is a high-speed gate driver for a field-effect transistor with output peak inflow / outflow currents of 7A / 3A ... This device works with input signals of logic levels and can drive a powerful external field-effect transistor. The device has direct and inverting inputs, which provide flexibility in driving the FET.

A common disadvantage of these devices when they are included in the control circuit of voltage converters is the need for a PWM controller or digital microcontroller.

The technical result consists in creating a controlled generator of nanosecond pulses by forming nanosecond pulses using a gate driver without using a PWM controller or digital microcontroller.

The technical result is achieved in that a controlled nanosecond pulse generator containing a gate driver, including a direct driver input, an inverting driver input and a driver output, characterized in that it additionally contains a circuit for creating a high logic voltage level at the direct input of the driver and a control device connected to the direct input of the driver, and the output of the driver is closed to the inverting input of the driver.

The essence of the proposed utility model is illustrated by drawings, where Fig. 1 shows a schematic diagram of a controlled nanosecond pulse generator.

FIG. 1 the following designations are adopted:

1 - driver;

2 - load;

3 - direct driver input;

4 - inverting input of the driver;

5 - driver output;

6 - circuit for creating a high logic voltage level;

7 - control device.

The proposed circuit of a controlled generator of nanosecond pulses (Fig. 1) is used for pulsed power supply of various loads in voltage converters, for example, a gate of a field-effect transistor, a winding of a pulse transformer, etc.

In the scheme under consideration, a controlled nanosecond pulse generator is built on driver 1, which has a direct driver input 3 and an inverting driver input 4. A high logic voltage level at the direct input of driver 3 is provided by a circuit for creating a high logic voltage level 6, a control device is also connected to the direct input of driver 3 7.

The basic principle inherent in the utility model is the use of a signal propagation delay from the direct input of driver 3 and from the inverting input of driver 4 to the output of driver 5 (units to tens of nanoseconds) to form 2 nanosecond voltage pulses of a fixed width at the load.

For this, the output of the driver 5 is closed to the inverting input of the driver 4. Such inclusion leads to the fact that at a high logic voltage level at the direct input of the driver 3, created by the circuit for creating a high logic level of voltage 6, a voltage appears at the output of the driver 5, which leads to power supply load 2 and to the appearance of a high logic voltage level at the inverting input of the driver 4, which after a delay time (units-tens of nanoseconds) transfers the output of the driver 5 and the associated inverting input of the driver 4 to a low-level state, removing the voltage from the load 2.

After that, after approximately the same delay time, a high logic voltage level appears again at the output of the driver 5, the load 2 is again powered, and the described process is repeated with a period equal to approximately twice the delay time. Controlling the duty cycle or turning off the output pulses at the output of the driver 5 is implemented by the control device 7, which sets the direct input of the driver 3 to a state of a low logic voltage level at the required moment for the required time.

Claims (1)

A controlled nanosecond pulse generator containing a gate driver, which includes a direct driver input, an inverting driver input and a driver output, characterized in that it additionally contains a circuit for creating a high voltage level at the direct input of the driver and a control device connected to the direct input of the driver, and the output the driver is closed to the inverting input of the driver.

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