Full wave rectification and half wave rectification are two common rectification methods in the circuit, and their main difference lies in the efficiency of the rectification and the output waveform.
Half-wave rectification is a simple form of rectification that uses only one diode to cut off the negative half-cycle of the AC electrical signal, leaving only the positive half-cycle output. Therefore, half of the waveform of the half-wave rectifier output has no signal in half of the cycle, and because only half of the cycle has output, the average output voltage is low, the efficiency is low, and the waveform contains more harmonic components.
Full-wave rectification uses a diode bridge grounded at a central point to convert the entire AC signal into a DC signal. Because the signal of the whole cycle is used, the output voltage is higher, the average is half the absolute value of the input AC signal, and the efficiency is also higher. Moreover, the output waveform of full-wave rectifier is smoother than that of half-wave rectifier, and almost contains no harmonic components.
Therefore, full-wave rectifier is more efficient and stable than half-wave rectifier, and the output voltage is higher, which is suitable for occasions with higher voltage requirements. But because of the need to use four diodes to form a bridge structure, the cost is also relatively higher.
Full wave rectification and half wave rectification are two common rectification methods in the circuit, and their main difference lies in the efficiency of the rectification and the output waveform.
Half-wave rectification is a simple form of rectification that uses only one diode to cut off the negative half-cycle of the AC electrical signal, leaving only the positive half-cycle output. Therefore, half of the waveform of the half-wave rectifier output has no signal in half of the cycle, and because only half of the cycle has output, the average output voltage is low, the efficiency is low, and the waveform contains more harmonic components.
Full-wave rectification uses a diode bridge grounded at a central point to convert the entire AC signal into a DC signal. Because the signal of the whole cycle is used, the output voltage is higher, the average is half the absolute value of the input AC signal, and the efficiency is also higher. Moreover, the output waveform of full-wave rectifier is smoother than that of half-wave rectifier, and almost contains no harmonic components.
Therefore, full-wave rectifier is more efficient and stable than half-wave rectifier, and the output voltage is higher, which is suitable for occasions with higher voltage requirements. But because of the need to use four diodes to form a bridge structure, the cost is also relatively higher.
The key differences between half-wave and full-wave rectification are:
1. Half wave rectification converts only half a cycle of the supplied AC input into a pulsating DC signal. Full wave rectification converts the two halves of the applied input signal into pulsed DC.
2, the other main difference between the two is that the rectification efficiency of the half-wave rectifier is lower than that of the full-wave rectifier.
1, In the circuit, there is a significant difference between full wave and half wave rectification.
2, half-wave rectification based on the single pilot diode, the positive half-cycle signal through and the negative half-cycle signal shielding, so that only half of the effective signal output. In contrast, a full-wave rectifier circuit can use two diodes and a central oscillator, so that both positive and negative half-cycle signals can be converted into positive signals, which will greatly increase the overall output power. 3, it should be noted that compared with half-wave rectifier, full wave rectifier circuit requires more devices and complex design, but its output power is higher, suitable for some applications requiring high output power.
Half-wave rectifier is often used in low-power applications because of its simple design and easy assembly and debugging.
The two big differences are:
First, the rectifier circuit is different, full wave rectifier is a full wave rectifier circuit, such as the simplest bridge rectifier circuit. Half wave rectifier is a half wave rectifier circuit, such as the simplest diode.
The form of DC wave after two cycles is different, full wave rectification is full wave DC in one cycle, half wave rectification is half wave DC in one cycle.
Third, the power is different, and the power of the direct current of full wave rectification is twice that of the half wave.
1. Different implementation methods
Full wave rectification means that the negative half cycle and positive half cycle of the AC signal are retained, and they are converted into a single pilot signal through two diodes, and then the two signals are combined into one output signal.
Half-wave rectification means that the negative half cycle of the AC signal is cut off, only the positive half cycle is retained, and then the positive half cycle signal is converted into a single pilot signal through a diode.
2. Different output signals
The output signal of full-wave rectification does not contain AC component, and is smoother than that of half-wave rectification, so it does not need too much filtering, but the implementation cost is higher.
The output signal of half-wave rectification contains half of the original signal, so further filtering is needed to obtain a smooth DC signal.
3, different application occasions
Full wave rectification is suitable for large load current situations.
Half wave rectification is suitable for the occasion of low load current.
1, the output waveform is different
The half-wave rectifier is basically equivalent to a diode, which clips the alternating current emitted by the magneto, only allowing the current in one direction to pass through, and the current in the other direction to be discharged.
The full-wave rectifier is equivalent to four diodes, and it uses the part of the current that is discharged by the half-wave rectifier, and the charging amount is large and stable.
2, the output frequency is not the same
Full wave rectification is to make use of the positive and negative half cycle current of alternating current, and the output pulsating current is to turn the negative half cycle of alternating current into a positive half cycle, that is, the 50Hz AC current becomes a pulsating current of 100Hz.
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.
3. The cost is not the same, the effect is not the same
The structure of half wave rectifier is simple, the cost is low, the disadvantage is low charging efficiency, small charging amount.
The structure of full wave rectifier is more complex, and the cost is higher than that of half wave rectifier, but the charging efficiency is high and the charging amount is large.
1. The difference between full wave rectification and half wave rectification is the shape and frequency of the output waveform.
2. Half-wave rectification only a half-cycle sine wave can pass through, so the frequency of the output signal is half of the input signal, and the waveform can only be positive half-cycle or negative half-cycle.
Full wave rectification is to convert the whole sine wave into a positive half wave or a negative half wave, and the output signal frequency is the same as the input signal, and the waveform is smoother.
3. In addition to the difference in waveform and frequency, the output voltage stability of full-wave rectifier is better than that of half-wave rectifier, and the output DC voltage is also more stable.
Therefore, in practical circuit applications, full wave rectification is more common.
1 The difference between full wave rectification and half wave rectification is that the output waveform is different.
2 Full wave rectifier can convert the negative half-cycle of periodic signals such as sine waves into positive half-cycle output, so the output signal frequency is twice the input frequency; The half-wave rectifier takes only the positive half-cycle signal, so the output signal frequency is the same as the input signal, but the output voltage peak is only half of the input voltage peak. In practical applications, full wave rectification is more widely used than half wave rectification, because the output signal frequency of full wave rectification is twice that of the input signal, and it is more suitable for applications requiring high-frequency operation, such as radio transceivers, laser transmitters, etc., and half wave rectification is often used in low-frequency applications such as measuring instruments, vibration receivers, and pressure sensors.
1 Both full wave and half wave rectification are methods used to convert alternating current to direct current, but they differ in the diodes used in the circuit.
2 Half wave rectifier uses a unidirectional diode that can only pass through a positive or negative half wheel of current, so that only half of the current can be converted to direct current. The full wave rectifier uses two diodes in parallel in reverse, which can allow the current of both the positive and negative half wheels to pass through, so that the full current of the alternating current can be converted into direct current.
3 In addition, the DC voltage of the full-wave rectifier output is relatively stable, and the fluctuation is small, which is suitable for the circuit requiring stable output; The DC voltage output of half-wave rectifier is relatively unstable, and the fluctuation is large, which is generally suitable for charging and other occasions that do not require DC voltage stability.
1 The difference between full wave rectifier and half wave rectifier is that the rectifier diode works differently.
2 Half wave rectifier only the signal in the positive half cycle can be output through the diode, while the full wave rectifier can output the signal in the positive half cycle and the negative half cycle.
Therefore, the current smoothness of full wave rectification is higher, and the output DC signal is more stable.
3 In addition, full-wave rectification requires twice as many diodes as half-wave rectification and is slightly more complex to construct.
However, it is more efficient than half-wave rectification.
Supplement: The circuit commonly used for full wave rectifier has four forms, which are midpoint rectification, bridge rectification, four-diode bridge rectification and full wave bridge rectification.
Both the bridge rectifier and the four diode bridge rectifier achieve full wave rectification through four diodes.
A: In the circuit, the difference between full wave rectification and half wave rectification is: first, the object of rectification is different.
The object of full wave rectification is each period of the waveform. Half wave rectification is only half cycle rectification of the waveform.
Second, the output rectifier wave is different after rectification. Full wave rectification is more stable than half wave rectification.
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1. The rectification principle is different
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Half wave rectification allows only half a cycle of the input signal to pass through, so the output signal retains only the positive half of the input signal, and the negative half is filtered out. The full wave rectification can make full use of all the cycles of the input signal, by using a central lead (such as the neutral point in the transformer) to convert the input signal into two phase opposite signals relative to the ground, so that the positive and negative half weeks can pass in the output, and the full cycle rectification is realized.
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Because full wave rectification is able to take advantage of the full cycle of the input signal, the output DC signal is more stable and has a smaller ripple factor. However, the output of half-wave rectifier has a large ripple phenomenon, because it cannot completely filter out the AC component of the input signal.
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3. Different circuit complexity
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In practical applications, full-wave rectifier requires the use of multiple diodes and capacitors to form a bridge rectifier circuit, so its circuit complexity is higher than half-wave rectifier. At the same time, because only one diode is needed for half-wave rectification, it is cheaper than full-wave rectification.
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In summary, the rectifier efficiency and output quality of full-wave rectifier are higher than that of half-wave rectifier, but its circuit complexity is also higher, and the cost is more expensive. Therefore, in practical applications, it is necessary to choose the appropriate rectification mode according to the specific needs.
The answer is: the capacity of the rectification is different. This is the answer from the question in the question. The specific difference is:
(1) Full wave rectification means that 100% capacity output can be generated through the installation of the rectifier, and the overall rectifier is fully functional and suitable for use.
Half wave rectifier means that the rectifier installed with half wave rectifier can only form half of the capacity output through the function of the rectifier.
1 Full wave rectification and half wave rectification are common rectification methods in circuits, but their difference lies in the efficiency of the rectification and the characteristics of the output waveform.
2 Half wave rectification can only use half of the AC waveform of the power supply, the efficiency is relatively low, and the output waveform is not smooth, there is a large ripple.
Full wave rectification can utilize the full range of AC waveforms of the power supply, which is more efficient and the output waveform is smoother.
3 Due to the high efficiency of full wave rectification and smooth output waveform, it is widely used in some occasions with high output quality requirements, such as electronic power supplies and electronic frequency converters.
Half wave rectifier is used more in some occasions with small power and low output quality requirements, such as small power supplies and ordinary household appliances.
1. Compared with half-wave rectifier, the output DC voltage is more stable and has less fluctuation. 2. This is because in the full wave rectifier circuit, the current can be switched on by two diodes, so that the positive half cycle and the negative half cycle can be rectified, so that the output voltage is relatively smooth. 3. The half-wave rectifier circuit can only use one and a half weeks of the current to conduct conduction, so the output waveform has a certain fluctuation, and the rectification efficiency is lower than that of the full-wave rectifier.
In practical applications, full wave rectifier circuits are often used in power supply regulator circuits, and half wave rectifier circuits are often used in low-power electronic devices.
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.
Half wave rectifier circuit is a common circuit that uses the rectifier element to remove half cycle in one direction, and the remaining half week to open the rectifier.
In half a cycle, the current flows through one rectifier, in another half a week, the current flows through the second rectifier, the two rectifier devices are connected so that the current flowing through them flows through the load in the same direction.
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The difference between full wave and half wave rectification
Ac current period
Half-wave rectification: Only half of the entire cycle of the AC power is output by the AC power.
Full wave rectification: The AC current outputs energy through the entire cycle.
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circuit configuration
Half-wave rectification: Rectification to DC voltage by a diode to eliminate the input negative voltage component.
Full wave rectification: The negative voltage component of the input voltage is converted into a positive voltage by a diode bridge circuit and then rectified into a DC voltage.
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condenser capacity
Half-wave rectification: The ripple voltage is larger
Full wave rectification: The ripple voltage is smaller, the ripple voltage is smaller, the stability is higher, the performance is better.
In the circuit, the rectifier circuit is a device that converts alternating current into direct current, and full wave rectification and half wave rectification are two common rectification methods.
Full wave rectification converts the signals in both directions of alternating current into forward signals, and the DC component of the output current is more stable and the voltage quality is better, but four diodes are needed.
Half-wave rectification, on the other hand, converts the signal in only one direction of the alternating current into a forward signal, and the output current has a less stable DC component and a lower voltage quality, but uses fewer diodes.
Therefore, the effect of full wave rectification is better, but the cost is higher. You can select an appropriate rectification mode based on application scenarios and cost constraints.
1 Full wave rectifier and half wave rectifier are two commonly used rectification methods in the circuit, and their difference is that there are certain differences in the stability and efficiency of the output voltage.
2 Half wave rectification can only output half a week of voltage selected from the sine wave, so there are more pulses in the output waveform, the voltage fluctuation is large, and the quality is poor.
The full wave rectifier can output both half cycles of the sine wave, so the output waveform is smoother, the stability is better, and the voltage efficiency is higher.
3 It is worth noting that full wave rectification requires the use of two diodes to achieve output rectification, so the overall cost and complexity are also higher.
In addition, in the circuit design, the appropriate rectification mode should be selected according to the specific use scenario.
1 The difference between full wave rectification and half-wave rectification is that when dealing with AC signals, full wave rectification can incorporate the complete cycle of each AC into the processing, while half-wave rectification can only process half of the signal of one cycle. This is because the full wave rectification can pass through two diodes and a central point, so that all the frequency components of the output signal after rectification are positive half wave, while the signal of the negative half wave can also be filtered through the capacitive filter, so as to obtain a direct current signal with higher amplitude and quality.
Half-wave rectifier can only use a diode to pass the positive half-wave signal, the frequency component is not complete, and the quality of the output DC signal is relatively low.
3 From the practical application scenario, full wave rectification is suitable for applications that require high-quality DC signals, such as linear power supplies, and half wave rectification is suitable for applications that require simple and low-cost, such as voltage multiple circuits.