If the voltage is too low, a regulator should be used instead of a regulator.
If the voltage is too low, the power equipment may not work properly, such as the motor speed is too slow, the light bulb is dim, etc. In this case, a voltage regulator is needed to increase the voltage so that the device can operate normally.
A voltage regulator is an electronic device used to adjust the voltage, which converts the incoming low voltage into the desired high voltage. A voltage regulator typically consists of an input power supply, a control circuit, and an output circuit. The input power supply inputs the low voltage to the control circuit, which adjusts the voltage of the output circuit according to demand. Common types of regulators include step-up transformers, step-up switching power supplies, and step-up regulators. 
A step-up transformer is a type of transformer that boosts the input voltage to the desired output voltage. It consists of an input coil and an output coil, and the voltage is increased by the ratio relationship of the coil. Step-up transformers are widely used in power systems such as transmission lines and power substations.
Step-up switching power supplies achieve voltage regulation through the switching operation of electronic components. It can increase the input DC voltage, or the input AC voltage can be rectified and filtered. Step-up switching power supplies have the advantages of fast regulation speed, high efficiency and small size, and are widely used in electronic equipment. A step-up regulator is a type of regulator that keeps the output voltage stable even when the input voltage fluctuates. It samples, compares, and controls the input voltage through a control circuit to keep the output voltage near the set value. Step-up regulators can be used in a variety of power equipment and electronic equipment with high stability and reliability.
However, it is not appropriate to use a voltage regulator when the voltage is too low. The voltage regulator is mainly used to adjust the output voltage so that it remains at the set value, but cannot increase the input voltage. If a voltage regulator is used to regulate the voltage, the power equipment still does not work properly because the input voltage is too low. Therefore, when the voltage is too low, a voltage regulator should be used to increase the voltage so that the device can operate normally.