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Энэ ажлаар дахин цэнэглэгддэг батарейны багтаамж болон дотоод эсэргүүцлийг хэмжих LabVIEW систем хөгжүүлсэн. Ингэхдээ Panasonic үйлдвэрийн AA хэмжээтэй Eneloop батарейны багтаамж, дотоод эсэргүүцлийг электроник ачаа (DL3021), програмчлагддаг тэжээлийн үүсгүүр (DP821), DAQ NI-9219 болон термохос ашиглан автоматаар хэмжиж авах аргыг боловсруулсан.
This study proposes a practical output current measurement system in a three-phase inverter with a single printed circuit board (PCB) Rogowski coil sensor inserted in the bus between the DC-link capacitor and the power semiconductor module. This system demonstrates its advantage over conventional output current sensors, such as the Hall effect current sensors, in terms of the size, weight, operation temperature and cost. The system can be applied to 6-in-1 power modules as it does not require sensors in the inverter phase legs. In our previous works, we have developed a method called “envelope tracking”, which is used in this system as well. This method traces the switching current instead of the output current to reproduce the output current signal in real-time. Envelope tracking successfully reproduced the output current waveform for single phase inverters under certain conditions. However, a large error is observed in the three-phase inverter demonstration under a high switching frequency (narrow pulse) or when the switching of different phases overlap each other. These errors must be completely suppressed to implement the system for feedback control in three-phase inverters. In this study, a new analog basis output current waveform reproduction system is introduced to suppress the above mentioned errors. This system is implemented in a three-phase insulated-gate bipolar transistor (IGBT) inverter and successfully reproduces the output current with a single PCB sensor inserted between a 6-in-1 IGBT power module and DC-link capacitor, operating under a switching frequency of 3.5–7.0 kHz and output current of 6 A with DC-link voltage of 150 V.
Энэ ажлаар практик хэрэглээнд чадлын хагас дамжуулагч төхөөрөмжийн модулд бусад хамгаалалтын хэлхээнүүдийн хамт интеграц хийх боломж бүхий гүйдлийн сенсорыг судалсан. Шинэ төрлийн гүйдлийн сенсор нь PCB хавтангаар хийсэн Роговски ороомог бөгөөд инвертер, конвертерийн түлхүүрийн элементын гүйдэлийн өөрчлөлтөөс шууд хамааралтай хүчдэл үүсгэх төхөөрөмж юм. Эндээс үүсэх хүчдлийн утгаас системийн гаралтын хүчдэлийг энгийн үйлдлийн өсгөгчд суурилсан аналог хэлхээ ашиглан тодорхойлох боломжтой. Уг санаанд суурилсан гйүдэл хэмжих “Envelop tracking” аргыг 1фазын инвертер системд туршиж баталсан ба удирдлагын сигналын (SPWM) хэт нарийн мужд аналог хэлхээнээс үүдэх хэмжүүрийн алдааг засах аналог хэлхээний шинэчлэлтийг мөн хийж туршилтаар баталгаажуулсан.
Measuring the current of a power conversion system is imperative. So, we have developed a new method of measuring a three-phase inverter’s currents of all loads with a single current sensor. We successfully tested this method on a computer simulation and an experimental setup. Which showed that the method can be integrated into power inverters. We proposed an inexpensive analog circuit suitable for capturing current information from a tiny PCB Rogowski coil. It measures the current of the power inverter’s DC supply line and resynthesizes all load currents separately. This way it will reduce the size and cost of a power conversion system’s current measuring devices.
Health monitoring of the power conversion system is very important. Therefore, we developed a new method for measuring IGBT currents and reproducing average load current to monitor IGBTs. This method was successfully tested on an experimental setup which showed that the tiny PCB sensors can be integrated into intelligent power modules. We proposed an inexpensive analogue circuit which is suitable for capturing current information from a tiny PCB Rogowski coil. The sensors and corresponding circuit can be embedded into an Intelligent Power Module. The method was named “Envelop tracking” as it simultaneously measures the currents of the high and low side switches of a power converter and reproduces the upper and lower edges of the load current which can be averaged by further digital processing.
This paper proposes a practical current sensor integration in the intelligent power modules (IPMs) using simple PCB Rogowski coil sensors. The PCB sensors produce signals that proportional to the high frequency switching current from high and low side IGBTs. Then with only general-purpose Op- Amps and photo-couplers based integrator and sample and hold (S/H) circuits reproduce output current of the inverter. Specifically, the “envelop tracking” method has successfully proved on an experimental inverter setup. A significant accomplishment of an improved new analog circuit is the measurement during narrow pulse width around unity modulation index that leads to higher inverter output power.
This paper proposes a practical current sensor integration in the intelligent power modules (IPMs) using simple PCB Rogowski coil sensors. The PCB sensors produce signals that proportional to the high frequency switching current from high and low side IGBTs. Then with only general-purpose Op- Amps and photo-couplers based integrator and sample and hold (S/H) circuits reproduce output current of the inverter. Specifically, the “envelop tracking” method has successfully proved on an experimental inverter setup. A significant accomplishment of an improved new analog circuit is the measurement during narrow pulse width around unity modulation index that leads to higher inverter output power.
