CN213461552U

CN213461552U - AC-AC hybrid boost switch capacitor converter

Info

Publication number: CN213461552U
Application number: CN202022182111.2U
Authority: CN
Inventors: 王红艳; 周媛; 陈景文; 田毅韬
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-06-15
Anticipated expiration: 2030-09-29

Abstract

An AC-AC hybrid boost switch capacitor converter comprises a switch S₁、S₂、S₃、S₄A first bridge arm formed by sequentially connecting in series and an output capacitor C₂、C₃The first bridge arm and the second bridge arm are connected in parallel; switch S₁、S₂Two-end parallel output capacitor C₃Switch S₂、S₃Two-end parallel switch capacitor C₁Switch S₃、S₄Two-end parallel output capacitor C₂(ii) a Switch S₁Both ends being input terminals of said converter, switch S₁An input inductor L is arranged between the input end and the input end; and two ends of the second bridge arm are used as output ends of the converter. Andcompared with the existing AC-AC converter which adopts a thyristor or a triac to adjust the voltage and the frequency, the converter topology integrates an inductive switch unit and a switch capacitor ladder unit, can enable the output voltage to follow the shape of the input voltage so as to keep the main frequency, and can execute direct energy conversion with high output voltage gain.

Description

AC-AC hybrid boost switch capacitor converter

Technical Field

The utility model belongs to the technical field of power electronics, a AC-AC mixes boost switch capacitance converter is related to.

Background

Autotransformers have been used in residential and industrial systems for decades as a means of regulating the voltage level between power electronics and the grid, but because they do not achieve isolation on the circuit, they cannot filter out harmonics, cannot maintain energy quality well, and are not high in safety. To address these problems, conventional autotransformers have been replaced by power converters that can regulate the output voltage/current, correct the power factor, and reduce the harmonic effects.

The most developed AC-AC converters use thyristors or triacs to regulate voltage and frequency and operate at lower switching frequencies. Although this type of converter has been used in industry, it has some limitations, such as low voltage gain, large input current THD, output frequency lower than input frequency, etc.

Disclosure of Invention

It is an object of the present invention to overcome the deficiencies of the prior art and to provide a Hybrid Boost Switched Capacitor Converter (HBSCC) for AC-AC conversion.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a hybrid boost switched capacitor converter for AC-AC conversion includes an input inductor L, a switched capacitor C₁Two output capacitors C₂And C₃And four switches S₁-S₄. Wherein, the switch S₁-S₄Each composed of two reverse series MOSFET tubes.

Further, an AC-AC hybrid boost switched capacitor converter includes a switch S₁、S₂、S₃、S₄A first bridge arm formed by sequentially connecting in series and an output capacitor C₂、C₃The first bridge arm and the second bridge arm are connected in parallel; switch S₁、S₂Two-end parallel output capacitor C₃Switch S₂、S₃Two-end parallel switch capacitor C₁Switch S₃、S₄Two-end parallel output capacitor C₂(ii) a Switch S₁Both ends being input terminals of said converter, switch S₁An input inductor L is arranged between the input end and the input end; and two ends of the second bridge arm are used as output ends of the converter.

The proposed converter combines a boost converter and a switched capacitor unit with an input voltage source V_SConnected in series with the input inductance L and connected to the switch S₁、S₂To (c) to (d); switched capacitor C₁Is connected across the input inductor L and the switch S₃、S₄To (c) to (d); four switches S₁、S₂、S₃、S₄After being connected in series two by two, the two are respectively connected with an output capacitor C₂And C₃Two sets of bridge arms are formed in parallel, and output capacitors C₂、C₃Two ends as output ends are connected with a load resistor Z₀The hybrid boost switched capacitor converter HBSCC is constructed.

In the converter, a switch S₁And S₃、S₂And S₄Are grouped with each other, are alternately turned on and off in one switching period, and are considered to have a switching frequency f_sMuch higher than the supply frequency f_g。

Adopt the beneficial effect that above-mentioned technical scheme brought:

the utility model discloses a mix boost switch capacitor converter for AC-AC conversion, there is the commutation problem in traditional direct AC-AC converter usually because there is not the effective path of input current in the dead time to lead to there being the overvoltage between the semiconductor. The proposed converter is modulated by one MOSFET per switch conducting during the half cycle of the output voltage, during which period it operates as a synchronous DC-DC topology.

Compared with the existing AC-AC converter which adopts a thyristor or a triac to adjust the voltage and the frequency, the converter topology integrates a basic induction switch unit and a switch capacitor ladder unit, can enable the output voltage to follow the shape of the input voltage so as to maintain the main frequency, and can perform direct energy conversion with a high output voltage gain.

Drawings

Fig. 1 is a circuit topology diagram of the present invention;

wherein: v_SIs an input voltage source; l is an input inductor; s₁、S₂、S₃、S₄The four switches are respectively formed by connecting two MOSFET tubes in series in the reverse direction; c₁、C₂、C₃Is a capacitor, wherein C₁Is a switched capacitor, C₂、C₃Is an output capacitor; z₀Is a load resistor.

Fig. 2 is a switch implementation of the present invention, consisting of two MOSFETs connected in reverse series;

fig. 3 is a circuit diagram of the operation of the present invention in two operation stages of the switch: (a) first stage (0 < t < DT)_S) (ii) a (b) Second stage (DTs < T < T)_S）。

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be described more clearly and completely with reference to the accompanying drawings.

Fig. 1 shows a topology of a hybrid boost switched capacitor converter incorporating a boost converter and a switched capacitor unit. Comprises an input inductor L and a switched capacitor C₁Two output capacitors C₂And C₃And four switches S₁-S₄. Wherein, the switch S₁-S₄Each consisting of two MOSFET tubes connected in series in opposite directions, see fig. 2.

The converter comprises an input voltage source V_SAnd an output terminal. In FIG. 1, an input source V_SHas a first source input connected thereto, so that the hybrid boost switched capacitor converter has an input source V_SAnd the input terminals in the converter are not indicated; similarly, the figure shows that the output end is connected with a load Z₀The latter schematic.

Specifically, referring to fig. 1, the input voltage source V of the hybrid boost switched capacitor converter_SConnected in series with the input inductance L and connected to the switch S₁、S₂To (c) to (d); switched capacitor C₁Is connected across the input inductor L and the switch S₃、S₄To (c) to (d); four switches S₁、S₂、S₃、S₄After being connected in series two by two, the two are respectively connected with an output capacitor C₂And C₃Two sets of bridge arms are formed in parallel, and output capacitors C₂、C₃Is connected with a load resistor Z by taking two ends as output ends₀The hybrid boost switched capacitor converter HBSCC is constructed.

In the converter, a switch S₁And S₃、S₂And S₄Are grouped with each other, are alternately turned on and off in one switching period, and are considered to have a switching frequency f_sMuch higher than the supply frequency f_g. When the converter is operating with alternating voltage and current, the switches must operate in all four quadrants.

The proposed converter is modulated by one MOSFET per switch conducting during the half cycle of the output voltage, during which period it operates as a synchronous DC-DC topology. The converter topology integrates a basic inductive switching cell and a switched capacitor ladder cell, allowing the output voltage to follow the shape of the input voltage to maintain the primary frequency and perform direct energy conversion with a high output voltage gain.

The utility model relates to a AC-AC mixes boost switch capacitance converter at switch S₁-S₄Has two working modes in two operation periods in one period. In the following, with reference to FIG. 3, in the first stage (0 < t < DT)_S) Second stage (DT)_S＜t＜T_S) To the working principle of the utility model, further explanation is carried out:

1. first stage (0 < t < DT)_S）

Switch S₁、S₃Is turned on, S₂、S₄Turning off; the input inductor L stores energy and the current increases; from a capacitor C₃Is transferred to the capacitorC₁Middle and high capacitance C₂And C₃To the load Z₀Providing energy;

2. second stage (DT)_S＜t＜T_S）

Switch S₂、S₄Is turned on, S₁、S₃Turning off; the energy stored in the inductor L is transferred to the capacitor C₃Middle and high capacitance C₁To C₂And (6) charging.

All switches adopt clamping circuits to prevent high voltage values from appearing at zero crossings of output voltage when modulation changes.

The switched capacitor unit has a voltage self-balancing characteristic and thus passes through three capacitors C without additional control₁、C₂And C₃Is equalized in each switching cycle.

Since there is no discontinuity in the input current, no input filter is required.

The converter has the following main components and parameters:

the type of the input inductor (L) is APH46P60-136 mu H; switched capacitor (C)₁) Using a polypropylene film capacitor, and an output capacitor (C)₂、C₃) Are both 20 mu F; switch (S)₁) Switch (S) with model number of SCT308AL-650V/80m Ω₂、S₃、S₄) The model is SCT2120AF-650V/120m Ω; power frequency 60Hz, switching frequency (f)_s) 100 kHz; input/output voltage (V)_S/V₀) 55/220V effective value; the duty cycle D is 0.5.

The utility model provides a single-phase AC-AC mixes boost switch capacitor converter, this converter have integrateed a basic inductive switch unit and a trapezoidal unit of switched capacitor, can make output voltage follow input voltage's shape in order to keep basic frequency, have avoided traditional AC-AC converter output frequency to be less than the condition of input frequency to carry out direct energy conversion with a high output voltage gain. Furthermore, the current stress in the switches and capacitors is related not only to the duty cycle and the output current value, but also to the on-resistance, capacitance and switching frequency of the switches. The voltage balance between the capacitors does not require an additional control circuit. The converter topology is effectively applicable to low voltage devices and ac conversion applications requiring high voltage gain. The utility model discloses a theory of operation and the design of relevant parameter of this converter to do with the analysis to the circuit in two stages under a switching cycle, supply this technical field personnel to understand better the utility model discloses the scheme.

Claims

1. An AC-AC hybrid boost switch capacitor converter, comprising a switch S₁、S₂、S₃、S₄A first bridge arm formed by sequentially connecting in series and an output capacitor C₂、C₃The first bridge arm and the second bridge arm are connected in parallel; switch S₁、S₂Two-end parallel output capacitor C₃Switch S₂、S₃Two-end parallel switch capacitor C₁Switch S₃、S₄Two-end parallel output capacitor C₂(ii) a Switch S₁Both ends being input terminals of said converter, switch S₁An input inductor L is arranged between the input end and the input end; and two ends of the second bridge arm are used as output ends of the converter.

2. The converter of claim 1, wherein switch S₁、S₂、S₃、S₄Each composed of two reverse series MOSFET tubes.

3. The converter of claim 1, wherein switch S₁、S₂、S₃、S₄Clamping circuits are adopted.

4. The converter according to claim 1, wherein the input inductance L is of a type APH46P60-136 μ H; switched capacitor C₁Adopts polypropylene film capacitor and switch capacitor C₁And an output capacitor C₂、C₃Are both 20 mu F; switch S₁The model is SCT308AL-650V/80m Ω and switch S₂、S₃、S₄The model is SCT2120AF-650V/120m Ω.