Scheme design of DC variable frequency hot water circulating pump based on GD32E230C8

The hot water circulating pump is a device that re-heats the cold water stranded in the home pipes through internal circulation to the hot heating system, and then delivers the hot water to all the hot water pipes in turn. The hot water circulating pump realizes that hot water is ready to use without waiting, which greatly improves the comfort of household hot water. At the same time, the preheating circulation technology of domestic hot water circulation pump avoids the unprovoked waste of pipeline cold water in traditional water heaters, saves a lot of domestic water, and is a necessary product for modern high-end household life.

Brief introduction of scheme

GD32E230C8T6 is used as the controller of DC variable frequency hot water circulating pump, and the GD32E230C8T6 chip is used as the main controller. It provides two power supply modes of 110V and 220V, adopts sine wave vector control algorithm, and has the characteristics of fast and stable start-up, less chopping, high carrier frequency, low noise, low temperature rise and stable power control. It has passed 3C, CE and GS certification with the whole machine.

Program characteristics

◆ The latest value Arm Cortex-M23@72MHz core is adopted
◆ Quickly locate the rotor position and realize 500ms quick start.
◆ Less chopping control to reduce temperature rise.
◆ High carrier frequency reduces noise.
◆ Speed intelligent control
◆ It has the function of limiting maximum power operation.
◆ Multiple operation modes

Scheme parameters

◆ working power supply: AC220V± 20%, 50/60Hz, AC110V± 20%, 50/60Hz
◆ Input power: 9W, 45W, 52W, 130W, 140W, 180W, 270W, 400W, 550W, 600W◆ Drive mode: sine wave drive.
◆ Lift: 3m,4m,5m,6m,8m,10m,11m,12m.
◆ Speed range: the water pump automatically generates the speed according to the change of flow pressure.
◆ Operating acceleration: max 4000rpm/s
◆ Safety performance: conform to GB4706.1, GB4706.32 or IECEN60335-1 and IECEN60335-2-40E.
◆ EMC performance: conforming to GB4343.1, GB4343.2 CISPR14-1, CISPR14-2, EN55014-1 and EN55014-2.

Introduction of system block diagram and main control MCU circuit

The MCU adopts GD32E230C8T6 chip, which uses the latest Cortex-M23 core of Arm, and its main frequency is as high as 72MHz. It is equipped with 64KB embedded flash memory and 8KB SRAM, and with the built-in hardware multiplier, divider and acceleration unit, its working performance can reach 55DMIPS at the highest main frequency, and the CoreMark test can reach 154 points. Compared with similar Cortex-M0 products in the market, the code execution efficiency at the same frequency is improved by 40%, and compared with Cortex-M0+ products, it is also improved by more than 30%.

The chip integrates a 16-bit advanced timer supporting three-phase PWM output and Hall acquisition interface, as many as five 16-bit general timers, a 16-bit basic timer, a high-speed rail-to-rail input/output analog voltage comparator, and a 12-bit 2.6M SPS sampling rate high-performance ADC. Suitable for various motor control and frequency conversion applications.

Main specifications of GD32E230 series MCU

◆ Cortex-M23@72MHz, 55 MIPS processing performance;
◆ Flash: 64KB/32KB/16KB;
◆ SRAM: 8KB/6KB/4KB;
◆ High-speed and high-precision ADC,12Bits ADCx1@2.6Msps,10 channels;
◆ Advanced timer x1, which can generate 6 complementary PWM outputs with adjustable dead zone;
◆ Universal timer x5;
◆ Flash with hardware encryption protection;
◆ Multiple serial communication modes: I2C x2,SPI x2,UART x2;
◆ Rich package types: TSSOP20/LGA20QFN28/QFN32/LQFP32/LQFP48
◆ Power supply voltage: 1.8V~3.6V
◆ Operating temperature range of industrial grade: -40℃~+85℃;
◆ Industrial ESD characteristics: 6000 Volt

Show the whole machine

Focusing on the 32-bit MCU of the GD32 series of Zhaoyi Innovation (www.bjzycxkjgf.dayinmao.com), the mos FET of SAKO Micro SLKOR (www.slkormicro.com) is widely used in this kind of scheme, such as TVS and ESD tubes which are responsible for motor driving, anti-static and surge discharge in peripheral circuits. Sawei Technology Co., Ltd. (http://www.slkormicro.com) was founded in 2005. For more than ten years, it has been adhering to the concept of "creating value by technology", mainly researching and producing silicon carbide, SiC silicon carbide diode, SiC silicon carbide MOS tube and IGBT single tube. Series 2301, 3401, 3904 and 13n50 products such as high and low voltage MOS tube, ChinaMOS, COOL MOS tube, power management IC, hall Hall element SL1603SL SL1613SH SL1615SH, thyristor, fast recovery diode and diode can also be matched with KingHelm (WWW.BDS666.COM) WiFi antenna, GPS antenna, Beidou antenna and TWS Bluetooth headset ceramic antenna. Mainly used in: new energy vehicles, intelligent robots, inverters, power tools, power electronics, switching power supplies, outdoor lighting power supplies, PD fast charging, TWS Bluetooth headsets and other fields.

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