A single phase passive power factor compensation circuit

Abstract

The utility model relates to the field of power electronics, concretely relates to a single -phase passive power factor compensation circuit, including input terminal, output terminal, diode group, capacitor assembly and inductance L1, input terminal includes terminal N and terminal L, the output terminal includes terminal H and terminal M, terminal N is connected with one end of inductance L1, diode group includes diode D1, D2, D3, D4, D5, D6, the anode of diode D1 is connected with the cathode of diode D2, the cathode of diode D2 is connected terminal N, the anode of diode D3 is connected with one end of inductance L1 and the cathode of diode D4, the anode of diode D5 is connected with the cathode of diode D6, the cathode of diode D5 is connected with the anode of diode D3, the cathode of diode D6 is connected with the anode of diode D4, the utility model constructs the phase -shifting PFC circuit, utilizes inductance capacitance phase characteristic, prolongs current conduction time, and power factor is promoted to 0.9, and active power is increased.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, specifically to a single-phase passive power factor compensation circuit. Background Technology

[0002] In the operation of power electronic equipment, the power factor is an important indicator for measuring the efficiency of electrical energy utilization. However, traditional single-phase rectifier bridge devices have some problems in practical applications.

[0003] Traditional single-phase rectifier bridge devices rely on capacitor energy storage and only achieve energy conversion in the voltage peak region. Their current waveform only conducts near the AC voltage peak, with a current duration of only 2-3 ms, resulting in poor current continuity and difficulty in improving the power factor. Currently, active boost PFC accounts for over 98% of the market. However, while active boost PFC can improve the power factor, it employs complex inductors, capacitors, and control circuits, leading to high cost, complex structure, and large board area. This not only increases system complexity but also raises manufacturing costs and space requirements.

[0004] Therefore, there is an urgent need to design a single-phase passive power factor compensation circuit that can effectively extend the conduction time of AC current and improve the power factor. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned problems and provide a single-phase passive power factor compensation circuit.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-phase passive power factor compensation circuit includes an input terminal, an output terminal, a diode group, a capacitor assembly, and an inductor L1;

[0008] The input terminal includes terminal N and terminal L; the output terminal includes terminal H and terminal M; terminal N is electrically connected to one end of inductor L1; the diode group includes diodes D1, D2, D3, D4, D5, and D6; the anode of diode D1 is connected to the cathode of diode D2; the cathode of diode D2 is connected to terminal N; the anode of diode D3 is connected to one end of inductor L1 and the cathode of diode D4; the anode of diode D5 is connected to the cathode of diode D6; the cathode of diode D5 is electrically connected to the anode of diode D3; and the cathode of diode D6 is electrically connected to the anode of diode D4.

[0009] Furthermore, the capacitor assembly includes capacitor C1 and capacitor C2; capacitor C1 is connected in parallel between the cathode of diode D1 and the anode of diode D2; both ends of capacitor C1 are connected to terminal H and terminal M respectively; one end of capacitor C2 is electrically connected to terminal L, and the other end is connected to the anode of diode D5 and the cathode of diode D6.

[0010] Furthermore, diodes D1, D2, D3, D4, D5, and D6 all have their positive terminals facing downwards.

[0011] The advantages of this utility model are:

[0012] This invention constructs a phase-shifting PFC circuit by adding diodes D5 and D6 and capacitor C2. By utilizing the characteristics of inductor current lag and capacitor current lead, the AC current conduction time is extended from the traditional 2-3 milliseconds to 8-9 milliseconds, solving the problem of short current conduction time and improving the power factor from 0.7 to 0.9. Attached Figure Description

[0013] Figure 1 This is a circuit connection diagram of a single-phase passive power factor compensation circuit in Example 1. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] The present invention will be described in detail below through specific embodiments to enable a better understanding of the present invention. However, the following embodiments do not limit the scope of protection of the present invention.

[0016] Example 1

[0017] This embodiment discloses a single-phase passive power factor compensation circuit.

[0018] like Figure 1 As shown, a single-phase passive power factor compensation circuit includes an input terminal, an output terminal, a diode group, a capacitor assembly, and an inductor L1.

[0019] The input terminals include terminal N and terminal L; the output terminals include terminal H and terminal M; terminal N is electrically connected to one end of inductor L1; the diode group includes diodes D1, D2, D3, D4, D5, and D6; the anode of diode D1 is connected to the cathode of diode D2; the cathode of diode D2 is connected to terminal N; the anode of diode D3 is connected to one end of inductor L1 and the cathode of diode D4; the anode of diode D5 is connected to the cathode of diode D6; the cathode of diode D5 is electrically connected to the anode of diode D3; and the cathode of diode D6 is electrically connected to the anode of diode D4.

[0020] Input terminals N and L are the power input terminals of the circuit, used to connect to a single-phase AC power supply. Input terminal N is electrically connected to one end of inductor L1 via a wire, while input terminal L is directly connected to one end of capacitor C2 and the anode of diode D6 via a wire. As the energy entry point of the circuit, input terminals N and L introduce AC power into the circuit, providing the power basis for subsequent phase shifting, rectification, filtering, and other stages.

[0021] One end of inductor L1 is connected to the input terminal N via a wire, and the other end is connected to both the anode of diode D5 and one end of capacitor C2 via a wire. Inductor L1 has the characteristic of current lagging behind voltage. By forming a shunt structure with capacitor C2, inductor L1 participates in current phase adjustment and extends the overall current conduction time.

[0022] The capacitor assembly includes capacitor C1 and capacitor C2; capacitor C1 is connected in parallel between the cathode of diode D1 and the anode of diode D2; both ends of capacitor C1 are connected to terminal H and terminal M respectively; one end of capacitor C2 is electrically connected to terminal L, and the other end is connected to the anode of diode D5 and the cathode of diode D6.

[0023] Capacitor C1 is the energy storage element of the filter circuit, and its two ends are connected in parallel between the cathode of diode D1 and the anode of diode D2 through wires. Under the action of rectified pulsating DC current, capacitor C1 smooths the voltage ripple through the charging and discharging process, providing a stable DC power output to the load.

[0024] Capacitor C2 is another phase-shifting element in the circuit. One end of it is connected to the other end of inductor L1 via a wire, and the other end is connected to the input terminal L via a wire. Capacitor C2 has the characteristic that the current leads the voltage. By forming a shunt structure with inductor L1, capacitor C2 superimposes the lagging current and the leading current, further extending the total current conduction time.

[0025] Furthermore, diodes D1, D2, D3, D4, D5, and D6 all have their positive terminals facing downwards.

[0026] Furthermore, this circuit is a phase-shifting PFC circuit. Because the capacitor current leads the voltage and the inductor current lags the voltage, the capacitor provides the current in the first half of the sine wave, while the inductor L1 provides the current in the second half. This extends the current conduction time from 2-3 milliseconds to 8-9 milliseconds, effectively reducing reactive power and increasing active power. This achieves the goal of improving the power factor.

[0027] The specific embodiments of this utility model have been described in detail above, but they are merely examples, and this utility model is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to this utility model are also within the scope of this utility model. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of this utility model should be covered within the scope of this utility model.

Claims

1. A single phase passive power factor compensation circuit, characterized by: Includes input terminals, output terminals, diode groups, capacitor assembly, and inductor L1; The input terminal includes terminal N and terminal L; the output terminal includes terminal H and terminal M; terminal N is electrically connected to one end of inductor L1; the diode group includes diodes D1, D2, D3, D4, D5, and D6; the anode of diode D1 is connected to the cathode of diode D2; the cathode of diode D2 is connected to terminal N; the anode of diode D3 is connected to one end of inductor L1 and the cathode of diode D4; the anode of diode D5 is connected to the cathode of diode D6; the cathode of diode D5 is electrically connected to the anode of diode D3; the cathode of diode D6 is electrically connected to the anode of diode D4. The capacitor assembly includes capacitor C1 and capacitor C2; capacitor C1 is connected in parallel between the cathode of diode D1 and the anode of diode D2; both ends of capacitor C1 are connected to terminal H and terminal M respectively; one end of capacitor C2 is electrically connected to terminal L, and the other end is connected to the anode of diode D5 and the cathode of diode D6.

2. A single phase passive power factor compensation circuit as claimed in claim 1, characterized in that: Diodes D1, D2, D3, D4, D5, and D6 all have their positive terminals facing downwards.

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