1, the half wave rectifier is basically equivalent to a diode, it clips the alternating current issued by the magneto, only allows the current in one direction through, the other direction of the electric discharge, the advantage is simple structure and low cost, the disadvantage is that the charging efficiency is low, the charging amount is small. The full-wave rectifier is equivalent to four diodes, and the part of the current discharged by the half-wave rectifier is also used, and the charging amount is large and stable.
2, full wave rectification is to use the positive and negative half current of alternating current, and the output pulsating current is to turn the negative half current of alternating current into a positive half current, that is, 50Hz AC current into 100Hz pulsating current. Half-wave rectification means that there is current output in half a cycle of alternating current and no current in the other half a cycle. After 50Hz AC is rectified by half wave, the output is 50Hz pulsating current.
Half-wave rectifier: the half-wave rectifier circuit has only one diode, which determines that the output voltage is only half a week, because the frequency of the input AC mains is 50Hz, so the main component of the output one-way direct current is still 50Hz; At the positive (negative) half-cycle the diode is on, but at the negative (positive) half-cycle the diode is off, so the half-wave rectification is a. Sacrifice; The commutation effect is exchanged for half of the AC at the cost, so the utilization rate of this circuit is very low, and this circuit is usually used in the case of high voltage and small current;
Full wave rectifier: The full wave rectifier circuit has two diodes, which can be regarded as the synthesis of two half-wave rectifier circuits, which is characterized by the positive and negative half weeks of the time, because the positive and negative half weeks of the alternating current are used, so the output of one-way pulsating direct current of the AC component is 100Hz. It can be seen that the full wave time requires a tap in the middle of the transformer secondary coil, so that the secondary coil is divided into two symmetrical windings, otherwise it is impossible to complete the full wave rectification.
answer
1. Different circuit structure. Half wave rectifier uses a diode rectifier. Full wave rectifier uses two diodes to form full wave rectifier.
2, DC output voltage is different. Half wave rectifier output DC voltage is 0.45 times the input AC voltage. The output DC voltage of full wave rectifier is 0.9 times that of the input AC voltage.
3, the transformer secondary is different. The half-wave rectifier transformer has no secondary tap. The full wave rectifier transformer has a middle point tap in the secondary.
Half-wave rectification requires only one diode, which only conducts positive or negative half-cycles during half a cycle, and its effective value is 0.45 times the input voltage.
Full wave rectifier has diode conduction in both positive and negative half cycles, and its effective value is 0.9 times the input voltage, which is twice the half wave rectifier.
To understand what people are saying, you first have to understand what is going on with the sine waves of mains electricity.
Half-wave rectification: the upper or lower half wave of the sine wave of the mains is separated into a discontinuous half-wave string with only a size change and no direction change (half wavelength separated in the middle).
Full wave rectification: separates the upper and lower two half waves of the sine wave of the mains electricity, and inverts one half wave into an uninterrupted half wave string with only a size change and no direction change. Difference: Half-wave rectification: The formation of a discontinuous half-wave string (half wavelength separated in the middle).
Full wave rectification: The formation of an uninterrupted half wave string.