CN102624275A - Inverter device based on DSP phase-shifting full bridge - Google Patents

Abstract

The invention relates to an inverter, in particular to an inverter device based on a DSP phase-shifted full bridge. The high-frequency transformer-based high-frequency inverter comprises an inverter bridge, a cycle converter, an LC filter, a high-frequency transformer and a DSP, wherein an A/D input interface of the DSP is connected with an output end of the LC filter through a voltage/current feedback circuit, and a PWM output interface of the DSP is connected with the inverter bridge and the cycle converter through a switching tube driving circuit respectively. The invention adopts a DC/AC/AC three-level topological structure, and the inverter bridge, the high-frequency transformer, the cycle converter and the filter are combined to form a main circuit, thereby reducing the first-level energy transmission compared with the traditional inverter structure; a high-frequency transformer is adopted, so that a heavy power frequency transformer is omitted; the control circuit adopts a DSP system, the digitization of the inverter is realized, the system control is flexible, the precision is high, control signals are directly synthesized by the DSP, the zero-voltage switch is realized, the switching loss is small, the efficiency is high, and the quality of output sine waves is good.

Description

Translated fromChinese

基于DSP移相全桥的逆变装置Inverter device based on DSP phase-shifting full bridge

  the

技术领域：Technical field:

本发明涉及逆变器，具体是一种基于DSP移相全桥的逆变装置。 The invention relates to an inverter, in particular to an inverter device based on a DSP phase shifting full bridge. the

背景技术： Background technique:

逆变器是一种把直流电转变为交流电的装置，在很多领域都有着重要的应用。逆变器在太阳能、风能等可再生能源利用中起着至关重要的作用。在UPS（不间断电源）和EPS（应急电源）中，逆变器也是重要组成部分。此外，在无功补偿、有源电力滤波等领域，逆变也是关键技术之一。An inverter is a device that converts direct current into alternating current and has important applications in many fields. Inverters play a vital role in the utilization of renewable energy such as solar energy and wind energy. In UPS (Uninterruptible Power Supply) and EPS (Emergency Power Supply), the inverter is also an important part. In addition, in the fields of reactive power compensation and active power filtering, inverter is also one of the key technologies.

传统逆变器采用“低压DC/工频低压AC/工频AC”或“DC/AC/DC/AC”结构，低压DC/工频低压AC/工频AC结构的逆变器工作频率低，需要体积庞大的工频变压器和滤波电感，设备笨重，效率低下；由于低频下多采用梯形波近似正弦波，谐波分量大，嗓声大，性能不可靠。DC/AC/DC/AC虽然也采用了高频链技术，但能量流动级较多，系统复杂。采用DSP等高速处理器，为逆变高频化的实现创造了条件。DSP具有强大的硬件和高速的指令速度，可以大大降低系统硬件结构的复杂度，从而提高系统的可靠性；控制灵活，可以使用多种基于计算机技术的高级控制算法。由DSP同步控制的周波变换器可以很容易将高频SPWM转变为工频交SPWM，相对于传统逆变器DC/AC/DC/AC的拓扑结构，减少了一级能量流动，提高了元件利用率和逆变效率。 The traditional inverter adopts "low voltage DC/power frequency low voltage AC/power frequency AC" or "DC/AC/DC/AC" structure, and the inverter with low voltage DC/power frequency low voltage AC/power frequency AC structure has low operating frequency. Large power frequency transformers and filter inductors are required, the equipment is bulky, and the efficiency is low; because trapezoidal waves are used to approximate sine waves at low frequencies, the harmonic components are large, the noise is loud, and the performance is unreliable. Although DC/AC/DC/AC also adopts high-frequency link technology, there are many levels of energy flow and the system is complex. The use of high-speed processors such as DSP creates conditions for the realization of high-frequency inverters. DSP has powerful hardware and high-speed instruction speed, which can greatly reduce the complexity of the system hardware structure, thereby improving the reliability of the system; flexible control, can use a variety of advanced control algorithms based on computer technology. The cycloconverter synchronously controlled by DSP can easily convert high-frequency SPWM into power-frequency alternating SPWM. Compared with the topology of traditional inverter DC/AC/DC/AC, it reduces the primary energy flow and improves component utilization. rate and inverter efficiency. the

发明内容： Invention content:

本发明旨在解决传统逆变器存在的上述问题，而提供一种采用DC/AC/AC三级拓扑结构并全数字化控制的基于DSP移相全桥的逆变器。The present invention aims to solve the above-mentioned problems existing in the traditional inverter, and provides a DSP-based phase-shifting full-bridge inverter that adopts a DC/AC/AC three-level topology and is fully digitally controlled.

本发明解决所述问题采用的技术方案是： The technical solution adopted by the present invention to solve the problem is:

一种基于DSP移相全桥的逆变装置，包括逆变桥、周波变换器、LC滤波器，它还包括高频变压器和DSP处理器，所述DSP处理器其A/D输入接口通过电压/电流反馈电路与LC滤波器的输出端连接，其PWM输出接口分别通过开关管驱动电路与逆变桥和周波变换器连接。A kind of inverter device based on DSP phase-shifting full bridge, including inverter bridge, cycloconverter, LC filter, it also includes high-frequency transformer and DSP processor, its A/D input interface of said DSP processor passes voltage The current feedback circuit is connected with the output terminal of the LC filter, and its PWM output interface is respectively connected with the inverter bridge and the cycle converter through the switch tube drive circuit.

更进一步： Going a step further:

所述DSP处理器芯片是MC56F8346，该芯片完成所有信号采集、运算、控制算法实现、移相SPWM产生。The DSP processor chip is MC56F8346, which completes all signal acquisition, calculation, control algorithm realization, and phase-shifting SPWM generation.

所述开关管驱动电路由四个IR2110芯片组成，分为两组，分别驱动逆变桥和周波变换器。 The switching tube driving circuit is composed of four IR2110 chips, which are divided into two groups, which drive the inverter bridge and the cycloconverter respectively. the

所述电压/电流反馈电路采用霍尔元件CLSM-10MA实现，将电压/电流信号线性转换为小电流信号，经过处理后，得到0-5V的电压信号，供AD采样。 The voltage/current feedback circuit is realized by Hall element CLSM-10MA, which linearly converts the voltage/current signal into a small current signal, and after processing, obtains a 0-5V voltage signal for AD sampling. the

本发明采用了DC/AC/AC三级拓扑结构，由逆变桥、高频变压器、周波变换器和滤波器组成功率主电路，比传统逆变结构减少了一级能量传输；采用了高频变压器，省去了笨重的工频变压器；控制电路由DSP系统、开关管驱动电路和电压/电流反馈电路组成，实现了逆变器的数字化。 The present invention adopts the DC/AC/AC three-level topology structure, and the power main circuit is composed of an inverter bridge, a high-frequency transformer, a cycloconverter and a filter, which reduces one-level energy transmission compared with the traditional inverter structure; The transformer saves the bulky power frequency transformer; the control circuit is composed of DSP system, switch tube drive circuit and voltage/current feedback circuit, realizing the digitization of the inverter. the

与现有技术相比，本发明的有益效果是：降低了硬件的复杂度，提升了硬件系统的可靠性。可以实现功率的双向流动，适合多种负载形式，并减小了逆变器的体积。数字控制系统灵活，精度高。采用移相SPWM技术，控制信号直接由DSP合成，实现零电压开关，开关损耗小，开关效率高，输出正弦波品质较好。 Compared with the prior art, the invention has the beneficial effects of reducing the complexity of the hardware and improving the reliability of the hardware system. The bidirectional flow of power can be realized, which is suitable for various load forms and reduces the volume of the inverter. The digital control system is flexible and has high precision. Using phase-shifting SPWM technology, the control signal is directly synthesized by DSP to realize zero-voltage switching, with small switching loss, high switching efficiency, and good output sine wave quality. the

附图说明： Description of drawings:

图1为本发明实施例系统结构示意图。Fig. 1 is a schematic diagram of the system structure of the embodiment of the present invention.

图2为本发明的功率主电路示意图。 Fig. 2 is a schematic diagram of the main power circuit of the present invention. the

具体实施方式： Detailed ways:

以下结合较佳实施例，详述本发明。The present invention will be described in detail below in conjunction with preferred embodiments.

参见图1、图2，一种基于DSP移相全桥的逆变装置，由逆变桥、高频变压器、周波变换器、LC滤波器和DSP处理器组成，DSP处理器芯片是MC56F8346，MC56F8346的A/D输入接口通过电压/电流反馈电路与LC滤波器的输出端连接，MC56F8346的PWM输出接口分别通过开关管驱动电路与逆变桥和周波变换器连接。逆变桥、高频变压器、周波变换器和LC滤波器组成功率主电路，DSP处理器、开关管驱动电路和电压/电流反馈电路组成控制系统。 Referring to Figure 1 and Figure 2, an inverter device based on DSP phase-shifting full bridge is composed of inverter bridge, high-frequency transformer, cycloconverter, LC filter and DSP processor. The DSP processor chip is MC56F8346, MC56F8346 The A/D input interface of the MC56F8346 is connected to the output terminal of the LC filter through the voltage/current feedback circuit, and the PWM output interface of the MC56F8346 is respectively connected to the inverter bridge and the cycloconverter through the switching tube drive circuit. Inverter bridge, high-frequency transformer, cycloconverter and LC filter constitute the power main circuit, DSP processor, switching tube drive circuit and voltage/current feedback circuit constitute the control system. the

DSP处理器芯片MC56F8346是整个数字控制系统的核心，DSP控制系统负责所有电流、电压的采集和运算、移相SPWM的产生以及人机接口的实现。具体是： DSP processor chip MC56F8346 is the core of the entire digital control system, and the DSP control system is responsible for the acquisition and calculation of all currents and voltages, the generation of phase-shifted SPWM, and the realization of man-machine interface. specifically is:

逆变桥接收DSP发出的移相SPWM信号，通过桥臂的开关，将低压直流电转变为高频SPWM交流电（SPWM低压功率信号）。The inverter bridge receives the phase-shifted SPWM signal from the DSP, and converts the low-voltage direct current into high-frequency SPWM alternating current (SPWM low-voltage power signal) through the switch of the bridge arm.

高频变压器将逆变桥产生的SPWM波形电压升压，转变成高压SPWM信号，以满足周波变换器的工作要求。 The high-frequency transformer boosts the SPWM waveform voltage generated by the inverter bridge and transforms it into a high-voltage SPWM signal to meet the working requirements of the cycle converter. the

周波变换器将高频变压器产生的SPWM波形交流电转变为工频SPWM波形电压，即工频交流电。 The cycloconverter converts the SPWM waveform alternating current generated by the high-frequency transformer into a power frequency SPWM waveform voltage, that is, power frequency alternating current. the

LC滤波器滤除工频SPWM电压中的高频成份，得到工频正弦交流电，为负载供电。 The LC filter filters out the high-frequency components in the power frequency SPWM voltage, and obtains the power frequency sinusoidal alternating current to supply power to the load. the

本实施例中，所述开关管驱动电路由IR2110及其外围电路组成，该芯片是MOSFET专用的驱动芯片，每个芯片可以为两路信号提供驱动，尤其适合对全桥电路进行驱动。 In this embodiment, the switching tube driving circuit is composed of IR2110 and its peripheral circuits. This chip is a MOSFET-specific driving chip. Each chip can provide driving for two-way signals, and is especially suitable for driving a full-bridge circuit. the

本实施例中，所述电压/电流反馈电路采用霍尔元件CLSM-10MA。CLSM-10MA可以检测频率为0-100kHz的信号，具有很高的线性度和抗干扰能力，满足逆变系统的需要。转换得到的电流信号滤波后，经过由运算放大器组成的调整电路，得到0-5V的电压信号，送入DSP采样通道。 In this embodiment, the voltage/current feedback circuit uses a Hall element CLSM-10MA. CLSM-10MA can detect signals with a frequency of 0-100kHz, has high linearity and anti-interference ability, and meets the needs of inverter systems. After the converted current signal is filtered, it passes through an adjustment circuit composed of an operational amplifier to obtain a 0-5V voltage signal and sends it to the DSP sampling channel. the

以上所述，仅是本发明的较佳实施例而已，并非对本发明的结构作任何形式上的限制。凡是依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明的技术方案的范围内。 The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the structure of the present invention in any form. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention. the

Claims (4)

1. inverter based on the DSP phase-shifting full-bridge; Comprise inverter bridge, frequency converter, LC filter; It is characterized in that; It also comprises high frequency transformer and dsp processor, and its A/D input interface of said dsp processor is connected with the output of LC filter through the voltage/current feedback circuit, and its PWM output interface is connected with frequency converter with inverter bridge through the switching tube drive circuit respectively.

2. the inverter based on the DSP phase-shifting full-bridge according to claim 1 is characterized in that, said dsp processor chip is MC56F8346, and this chip is accomplished all signals collecting, computing, control algolithm realization, phase shift SPWM generation.

3. the inverter based on the DSP phase-shifting full-bridge according to claim 1 is characterized in that, said switching tube drive circuit is made up of four IR2110 chips, is divided into two groups, respectively drive inverse bridge and frequency converter.

4. the inverter based on the DSP phase-shifting full-bridge according to claim 1 is characterized in that, said voltage/current feedback circuit adopts Hall element CLSM-10MA to realize.

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