What happens when you increase the width of a pulse?

What happens when you increase the width of a pulse?

Increasing the pulse width increases the amount of energy reflected off the target and thereby increases the range at which an object can be detected. Radars measure range based on the time between transmission and reception, and the resolution of that measurement is a function of the length of the received pulse.

What determines pulse width?

Pulse Width (PW) is the elapsed time between the rising and falling edges of a single pulse. To make this measurement repeatable and accurate, we use the 50% power level as the reference points. The basic unit of measure for PRF is hertz (Hz). Use PRF to report the number of pulses per second.

What effects the pulse width of the output voltage?

The resistance and capacitance values control the frequency of operation and the duty cycle. Your design can push the motor to run faster by increasing the duty cycle of the PWM output signal. Increasing the frequency results in wider “on” pulses and a higher average voltage.

What is pulse width in power electronics?

One widely used approach is pulse-width modulation (PWM), which controls the power switch output power by varying its ON and OFF times. The ratio of ON time to the switching period time is the duty cycle. The higher the duty cycle, the higher the power semiconductor switch output power.

Why do we use pulse width modulation?

Pulse width modulation is a great method of controlling the amount of power delivered to a load without dissipating any wasted power. The above circuit can also be used to control the speed of a fan or to dim the brightness of DC lamps or LED’s. If you need to control it, then use Pulse Width Modulation to do it.

How does pulse width modulation control motor speed?

As its name suggests, pulse width modulation speed control works by driving the motor with a series of “ON-OFF” pulses and varying the duty cycle, the fraction of time that the output voltage is “ON” compared to when it is “OFF”, of the pulses while keeping the frequency constant.

What is pulse width modulation in inverters?

Pulse-width modulation is the process of modifying the width of the pulses in a pulse train in direct proportion to a small control signal; the greater the control voltage, the wider the resulting pulses become.

What do you understand by pulse width modulation?

Pulse-width modulation (PWM) is a modulation process or technique used in most communication systems for encoding the amplitude of a signal right into a pulse width or duration of another signal, usually a carrier signal, for transmission.

How is the power of a pulse measured?

The energy content of the pulse is equal to the peak (maximum) power level of the pulse multiplied by the pulse width. However, meters used to measure power in radar system do so over a period of time that is longer than the pulse width. For this reason, pulse-repetition time is included in the power calculations for transmitters.

How does Pulse Width Modulation reduce electrical power?

Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a method of reducing the average power delivered by an electrical signal, by effectively chopping it up into discrete parts.

How is the spatial width of a pulse determined?

Spatial Width of a Pulse. The spatial width of a pulse in the propagation direction is given by the group velocity times the temporal pulse width. Despite the high velocity of light, ultrashort pulses can also be very short in the spatial domain.

Why is pulse repetition time included in power calculations?

For this reason, pulse-repetition time is included in the power calculations for transmitters. Power measured over such a period of time is referred to as average power. Peak power must be calculated more often than average power. This is because most measurement instruments measure average power directly.