A pulse modulator controls the amount of energy supplied to an electronic device, maintaining accuracy and consistency. It acts as a switch, modulating power to prevent overheating or incorrect voltage supply. It is used in electric stoves, computer towers, and broadcast frequency signals.
A pulse modulator is a device used within an electronic circuit to alter or maintain the amount of energy supplied to the device that the circuit is powering. If the device has a specific power tolerance threshold that must be maintained to protect circuit components, a pulse modulator is often the modulation source for the voltage or power signal supplied to the device. The pulse modulator works to ensure that the accuracy or consistency of the device is maintained.
Power modulation is performed by the pulse modulator when the modulator acts as a control switch. Here, the modulator switches between on and off positions to allow only a specific amount of signal to reach the circuit. If necessary, it will clip the signal to modulate the power.
For example, the amount of voltage supplied to the circuits within an electric stove determines the amount of heat supplied by the stove. The input voltage in the circuit depends on the temperature that the user sets as desired heat, and therefore must be modulated to be maintained. The pulse modulator acts as a switch supplying that specific amount of voltage so that the electric stove does not simply heat to its full capacity and become dangerously hot, or simply turn on and stay on for the duration of the cooking time . To maintain the desired level of heat, the pulse modulator controls the amount of power signal delivered to the heating element.
Another example of the need for pulse modulation is the power supply used in a desktop computer tower. Because different voltages are required in different components of computer circuits, the power supply must be equipped with a pulse modulator. The modulator is able to switch the amount of voltage to each component to ensure that a component running on 5 volts does not get 12.
Modulators are also used in the pulse width modulation of a broadcast frequency signal, mainly for telecommunication or signal delivery over a wider range. The modulator is placed in the circuit directly before the transmitter of the output signal and used to modulate the amount of power delivered to the transmitter. This modulation is used to make the signal reach a wider bandwidth by increasing the amount of power driving the transmitter, making the signal stronger.
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