Single-phase bridge rectifier with power factor correction function
By integrating two additional diodes into the conventional single-phase bridge rectifier, the device extends current conduction time and simplifies the circuit, effectively addressing the challenges of poor current continuity and high complexity in existing solutions, thereby improving power factor and reducing costs and reliability risks.
Patent Information
- Application Number
- JP2025001262U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2025-03-21
- Filing Date
- 2025-04-22
- Publication Date
- 2025-06-30
- Estimated Expiration
- 2035-04-22
AI Technical Summary
Conventional single-phase bridge rectifiers have poor current continuity and difficulty in improving the power factor due to limited current action time, and existing active Boost PFC solutions are complex, costly, and reliability-risk prone.
A single-phase bridge rectifier with a power factor compensation function is achieved by adding two diode elements (D5 and D6) to the conventional bridge rectifier structure, extending the current conduction time and simplifying the circuit configuration.
The modified rectifier significantly improves current waveform continuity, achieves power factor compensation without complex external circuits, reduces component costs and area occupation, and enhances reliability.
Smart Images
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Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power electronics technology, and particularly relates to a single-phase bridge rectifier having a power factor compensation function.
Background Art
[0002] In the operation of power electronic devices, the power factor is an important indicator for evaluating power utilization efficiency. However, the following problems exist in conventional single-phase bridge rectifiers. Conventional single-phase bridge rectifiers rely on energy storage by capacitors and achieve energy conversion only at the voltage peak. Therefore, current flows only near the maximum value of the AC voltage, and the current action time is only 2 - 3 ms. As a result, the continuity of the current is poor, and it is difficult to improve the power factor. Currently, the mainstream active Boost PFC occupies more than 98% of the market share. However, although the power factor is compensated by the active Boost PFC, a complex combination of an inductor, a capacitor, and a control IC is required, and problems such as high cost, large occupied area, and reliability risk (increase in failure rate due to an increase in the number of components) can be cited. Therefore, it is urgent to develop a rectifier device with a simple structure and high power factor.
Summary of the Invention
[0003] The purpose of this utility model is to provide a single-phase bridge rectifier having a power factor compensation function in order to solve the above problems.
[0004] To achieve the above object, this utility model adds two diode elements to the conventional bridge rectifier structure to also have a power factor compensation function. This utility model adopts the following technical means. The single-phase bridge rectifier having a power factor compensation function according to this device includes an input terminal, a diode group, and an output terminal. The input terminal consists of terminal N and terminal L, and the output terminal consists of terminal H and terminal M. The diode group includes diodes D1, D2, D3, D4, D5, and D6. The anode of diode D1 is connected to terminal N, and the cathode is connected to the cathode of diode D6. The cathode of diode D2 is connected to terminal N, and the anode is connected to the anode of diode D5. The anode of diode D3 is connected to the cathode of diode D5 and terminal B, and the cathode is connected to terminal L. The anode of diode D4 is connected to terminal L, and the cathode is connected to the anode of diode D6 and terminal A. Furthermore, for all of diodes D1 to D6, the anode sides are arranged downward. Furthermore, terminal H is connected to the cathodes of diode D6 and diode D1 respectively. Furthermore, terminal M is connected to the anodes of diode D5 and diode D2 respectively.
[0005] The advantages of this utility model are as follows. In this utility model, by newly adding diodes D5 and D6 to the diode group of the conventional single-phase bridge rectifier circuit, the conduction time of the current is extended from the conventional 2 - 3 ms to 6 - 8 ms, significantly improving the continuity of the current waveform, and realizing a power factor compensation function. Thereby, it does not require a complex external circuit such as an additional inductor, the circuit configuration is simple and easy to implement, while simultaneously achieving a reduction in the number of used parts, a reduction in component costs, and a reduction in the substrate occupation area.
Brief Description of the Drawings
[0006]
Figure 1
Figure 2
Figure 3
Modes for Carrying Out the Invention
[0007] With reference to the drawings in the embodiments of the present utility model below, the technical means in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Usually, the components of the embodiments of the present utility model described and shown in the attached drawings here can be arranged and designed in various different arrangements. The following is a specific introduction of the present utility model based on specific embodiments, which is only for better understanding, but the following embodiments do not limit the protection scope of the present utility model.
[0008] Embodiment 1 In this embodiment, a single-phase bridge rectifier with a power factor compensation function is disclosed. As shown in FIG. 1, the power factor compensation single-phase bridge rectifier includes an input terminal, a diode group, and an output terminal. The input terminal consists of terminal N and terminal L, and the output terminal consists of terminal H and terminal M. The diode group includes diodes D1, D2, D3, D4, D5, and D6. The anode of diode D1 is connected to terminal N, and the cathode is connected to the cathode of diode D6. The cathode of diode D2 is connected to terminal N, and the anode is connected to the anode of diode D5. The anode of diode D3 is connected to the cathode of diode D5 and terminal B, and the cathode is connected to terminal L. The anode of diode D4 is connected to terminal L, and the cathode is connected to the anode of diode D6 and terminal A. Furthermore, the anodes of all diodes D1 to D6 are arranged downward. Furthermore, terminal H is respectively connected to the cathodes of diode D6 and diode D1. Furthermore, terminal M is respectively connected to the anodes of diode D5 and diode D2.
[0009] Embodiment 2 As shown in FIGS. 2 to 3, a 50 Hz sinusoidal AC voltage is applied to the input, and in the positive half cycle, terminal N is set as the positive electrode and terminal L is set as the negative electrode. Also, it is assumed that the initial voltage of capacitor C3 is zero. The single-phase bridge rectifier with a power factor compensation function in this embodiment includes an input terminal, a diode group, a capacitor section, and an output terminal. The input terminal consists of terminal N and terminal L, and the output terminal consists of terminal H and terminal M. The diode group includes diodes D1, D2, D3, D4, D5, and D6. The anode of diode D1 is connected to terminal N and the negative electrode of capacitor C1, and the cathode is connected to the cathode of diode D6. The cathode of diode D2 is connected to terminal N, and the anode is connected to the anode of diode D5. The anode of diode D3 is connected to the cathode of diode D5, and the cathode is connected to terminal L. The anode of diode D4 is connected to terminal L, and the cathode is connected to the anode of diode D6. Furthermore, the capacitor section includes capacitors C1, C2, and C3. The negative electrode of capacitor C1 is connected to the anode of diode D1 and terminal N, and the positive electrode is connected to the anode of diode D6 and the cathode of diode D4 via terminal A. The positive electrode of capacitor C2 is connected to the cathode of diode D2 and terminal N, and the negative electrode is connected to the anode of diode D3 and the cathode of diode D5 via terminal B. Both ends of capacitor C3 are respectively connected to terminal H and terminal M. Furthermore, the anodes of all diodes D1 to D6 are arranged downward. Furthermore, one end of inductor L1 is connected to capacitor C3, and the other end is connected to the cathodes of diodes D1 and D6.
[0010] When the sine-wave AC voltage starts to rise from 0, diodes D1, D3, and D5 conduct, forming a charging circuit to capacitor C3. At the same time, capacitor C2 is charged with the negative electrode of capacitor C1 as the positive electrode and the positive electrode of C1 as the negative electrode, and is connected to terminal L through the conducting diode D3. At this time, diodes D2, D4, and D6 are in the cut-off state. At this stage, power is supplied to capacitor C3 due to the conduction of the diodes, and capacitor C2 stores energy. When the time exceeds 5 ms, the sinusoidal AC voltage reaches the peak value, and the voltage between terminals L and N is reversed according to the principle of electromagnetic induction. At this time, the current flows continuously, and the stored capacitor C2 partially releases energy through diodes D5 and D1. Compared with the conventional bridge rectification (depending only on capacitors C1 and C2, with the current acting time of 2 - 3 ms), this circuit extends the continuity of the current to 6 - 8 ms and effectively improves it through the addition of diodes D5 and D6 and the cooperation of optimized components. When it exceeds 10 ms, the sinusoidal AC voltage is reversed, and diode D4 conducts to charge capacitor C1. At the same time, with the voltage reversal, capacitor C2 injects energy into capacitor C3 through diode D5, and this process repeats in a cycle.
[0011] The above has described in detail the specific embodiments of this utility model, but this is only an illustration, and this utility model is not equivalent to the above specific embodiments. For those skilled in the art, any equivalent changes or substitutions to this utility model are included within the scope of this utility model. Therefore, all equivalent deformations and changes made without departing from the spirit and scope of this utility model should be included within the scope of this utility model.
Claims
1. A single-phase bridge rectifier having a power factor compensation function, the single-phase bridge rectifier including an input terminal, a diode group, and an output terminal, the input terminal including a terminal N and a terminal L, and the output terminal including a terminal H and a terminal M, a cathode of the diode D1 is connected to the terminal N, a cathode of the diode D2 is connected to the terminal N, anode of the diode D2 is connected to the anode of the diode D5, an anode of the diode D3 is connected to the cathode of the diode D5 and the terminal B, a cathode of the diode D3 is connected to the terminal L, and an anode of the diode D4 is connected to the terminal L, a cathode of the diode D4 is connected to the anode of the diode D6 and the terminal A.
2. 2. The single-phase bridge rectifier with power factor compensation function as claimed in claim 1, wherein the diodes D1 to D6 are all arranged with their anodes facing downward.
3. 2. The single-phase bridge rectifier with power factor correction function as claimed in claim 1, wherein the terminal H is connected to the cathodes of the diodes D6 and D1, respectively.
4. 2. The single-phase bridge rectifier with power factor correction function as claimed in claim 1, wherein the terminal M is connected to the anode of the diode D5 and the anode of the diode D2, respectively.