Renesas Energy Saving "function Module" Solution

"Function module" is composed of Renesas's high-performance MCU, power device and simulator, and provides customers with hardware, software and system technology as a complete set of solutions. In this way, the time of system development can be shortened, the number of components can be reduced, and the higher performance and function of the system can be promoted.

Power electronics technology to promote low power consumption

Power electronic technology refers to the overall name of the system of generating electric energy (power generation), transmitting electric energy (power transmission), changing electric energy (power transformation) and storing electric energy (power storage), and also includes the meaning of constructing and using the system.

Power electronics is composed of circuit technology, control technology, application technology and so on. At present, the biggest purpose of power electronics is to reduce power consumption. How to generate, transmit, transform and store electricity more efficiently, and support the technology of power electronics to promote low power consumption.

Development of power electronics technology

Current situation and subject

In order to reduce power consumption, today's power electronic systems pursue accurate work control, efficient operation and reduce the waste of energy consumption. Therefore, the traditional analog control will be replaced by digital control using MCU.

Analog control does not need to understand the knowledge of MCU for the circuit designer of power electronics technology. However, once the era of digital control, the circuit design of power electronics technology must have a sufficient understanding of MCU and its suitable devices. Similarly, the software designer must also understand the complex power electronics technology circuit.

In fact, we can hear from many analog designers of power electronic technology circuits that they are difficult to adapt to MCU and MCU software development, resulting in confusion.

In addition, the design should also start from the function, performance and cost. It takes a lot of time to select the most appropriate MCU and its matching devices.

Moreover, for more and more power electronic technology systems that need digital operation control, flexible use of MCU with higher performance than traditional MCU and high-precision system design integrating power electronic technology circuit and control software require designers to have higher knowledge and experience.

"Answer" to the subject of power electronic technology system development

Expecting "function module"

For a long time, Renesas has launched various low-end to high-end control MCU for power devices such as IGBT and MOSFET, as well as analog-digital IC, optocoupler and driver IC. Renesas proposes to take the "AC-DC", "DC-DC" and "DC-AC" functions of the basic functions of power electronic technology circuits as "functional modules", which will give full play to this technical strength.

Thus, in order to realize the required functions, Renesas can support all-round proposals from MCU, power devices and various ICs to system implementation.

It has also been mentioned before that when developing the power electronic technology system promoting digital control, the power electronic technology circuit designer has insufficient knowledge and experience in MCU and MCU software development, as well as the time spent on the selection of MCU and various devices.

However, after using the MCU and devices recommended by Renesas as "functional modules", designers do not need to spend too much time on selection, but can focus more on circuit design and software development. In addition, Renesas has also prepared a large number of technical data such as MCU routines and device usage methods, which can be fully and reliably supported by designers.

In addition, designers can also design higher-level circuits by participating in various seminars arranged by Renesas, such as device application, power electronic technology circuit design, MCU control program development and so on.

The "function module" provided by Renesas can be said to be the "answer" to overcome the problem of power electronic technology system development.

"Functional module" of power electronic technology system

Ordinary power electronic system is composed of several functional modules, and its functional modules can find a common structure. The input is analog signal and the output is PWM (pulse width modulation) signal. The control circuit is composed of MCU and program, and the power circuit is composed of driving circuit and power device.

The input analog signals include voltage, current, temperature, speed, etc. The output PWM signal has constant amplitude and different duration pulse sequence to drive power devices such as IGBT (insulated gate bipolar transistor) and power MOS FET. The control circuit integrates the control algorithm as a software program. Even the same functional module can meet different specifications by changing the program.

Let's take a practical look at the cases of four areas of special concern in the power electronic technology system using the "functional modules" provided by Renesas.

â—† household solar regulator to maximize solar energy

First of all, we want to introduce the household solar power generation system. The system is called "household solar regulator", which is composed of control circuit composed of "DC / DC boost module", "frequency converter module" and MCU. The direct current generated by solar panel power generation is converted into alternating current through frequency converter and then transmitted to commercial power supply system.

The output power of the solar panel will not only change due to the sunshine conditions, but also change due to the voltage required on the load side. At this time, MCU is used to control the DC / DC boost module to keep the output power of the solar cell at the maximum value through a control mode called "maximum power point tracking (MPPT).

â—† motor frequency converter for air conditioner to realize energy saving and mute

Next, we will introduce the motor control system of household air conditioner. The system is called "motor frequency converter for air conditioning", which is composed of control circuit composed of "PFC (power factor correction) module", "three-phase frequency converter module" and MCU. PFC module can rectify the input commercial power AC into DC, and remove harmonic noise at the same time. The three-phase frequency converter module converts the DC into three-phase AC (the phase difference of the three potential is 120 degrees) to drive the motor smoothly. The speed of the motor is monitored through the sensor, and the operation of the functional module is always controlled at the best value through MCU.

â—† UPS (uninterruptible power supply device) with high efficiency backup power supply

Next, we will introduce the application example of small ups. The system can be used as a standby power supply when the commercial power supply stops power transmission for some reason. The power supply time of different UPS also ranges from 3 minutes to 3 hours.

UPS is composed of control circuit composed of "PFC module", "DC / DC boost module", "frequency converter module" and MCU. PFC module can rectify the AC input from commercial power supply into DC, and remove harmonic noise at the same time. The DC power is stored in the battery inside the ups. The DC / DC boost module usually converts the output of PFC into appropriate DC voltage and supplies power to the battery at the same time. In case of power failure, it shall be output from the battery and boosted to the appropriate DC voltage. The frequency converter module converts the current output by the DC / DC boost module into the same AC power as the commercial power supply.

â—† electric vehicle (EV) charging station supporting the next generation of vehicles

Finally, an example of charging station for electric vehicle (EV) is introduced. EV charging station is a new system that can charge electric vehicles (EV) in a short time. It is believed that the number at home and abroad will increase rapidly in the future.

The EV charging station is composed of a control circuit composed of "three-phase PFC module", "insulated DC / DC converter module" and MCU. The input power supply is not the usual 100V AC power supply, but a three-phase 200V AC power supply. In order to shorten the charging time, a high-power power supply is also used. The three-phase PFC module is the same as the PFC module mentioned above, which can convert three-phase AC into DC. The insulated DC / DC converter module electrically insulates the input and output and generates the high voltage and high current required for EV charging.

So far, Dr. tanamoto has introduced many examples of power electronic technology systems that make use of "functional modules". Next time, we will introduce Renesas MCU, power devices and simulator products that support the "function module" solution.

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