MPS photovoltaic inverter overall solution introduction, leading technology show time!

The above picture shows the overall solution of MPS inverter. Below we will focus on several types of products with significant advantages of MPS:

1. Technologically advanced flyback auxiliary power

1) . Flyback chip with built-in 700V 40W MOS: HF500-40 The built-in MOS of 700V allows it to be used in the AC auxiliary power of single-phase inverters, meeting the single-phase mains voltage input with sufficient margin. The built-in MOS can also streamline the BOM and reduce the board area. The new generation of HF500-40 is expected to be launched next year, which will support both QR and CCM modes.

2) . Fixed-frequency flyback controller "HFC0310 new generation product", supports SiC drive, peak current mode The DC auxiliary power of the three-phase inverter needs to support an ultra-wide input voltage range, such as 160-1100V; this means that a 1700V SiC MOS is required to support such a high-voltage input flyback. It also needs to support a wide load, because the power requirements vary greatly depending on the size of the model, and there are requirements in the range of 30-200W. Therefore, in such scenarios, the controller solution with external MOS and support for SiC drive is very suitable. It can be matched with MOS and heat sinks of different specifications and flexibly applied to various power segments. The new generation of HFC0310 products will be released soon. Its first highlight is that it supports SiC drive, and the second highlight is that the startup current is extremely low, which greatly reduces the design difficulty of the Vcc pull-up startup circuit.

3) . Flyback converter with built-in 900V MOS: HF9XX The AC auxiliary power of the three-phase inverter often needs to support line voltage input, so a 900V high-voltage MOS is required. The first highlight of HF9XX is that it integrates 900V MOS, which can simplify BOM and reduce the board area. The second highlight is that it supports PSR feedback, which can save optocouplers and reduce BOM costs. The third highlight is that it supports QR quasi-resonant switching and reduces switching losses. MPS's patented technology allows HF9XX to lock the valley steadily and will not jump between multiple valleys, avoiding the generation of audible noise.

2. Ultra-high cost-effective SMD current Hall chip

1) . SMD Hall chip MCS1810/2, supports 5-100A range, replaces 50A Hall module MPS uses innovative IC technology to integrate the conductor for current flow, the Hall for inducing current magnetic field, and the wafer for Hall signal processing into the cost-effective package of SOIC-16, and can meet the isolation design requirements of reinforced insulation. Compared with the same specification Hall module, it can significantly reduce costs.

2) . Hall chip module "high current version of MCS1810/2", the range is further expanded to 400A MPS's integrated Hall chip module uses SMT or DIP packaging to further reduce the primary impedance, improve temperature rise, and the maximum current range can reach 400A.

3. Reliable capacitive isolation driver chip

1) . Capacitive isolation driver MPQ18811, supports active Miller clamping function: Because the three-phase inverter needs to support a bus voltage of up to 1100V, 1200V withstand voltage SiC power devices have become an excellent choice for high efficiency and improving the power density of the whole machine. However, SiC devices have their own limitations and have many requirements for the hardware design of the inverter: SiC devices require higher driving voltages, often requiring +15V, +18V to fully conduct the tube; SiC devices have extremely low Vth, often between 2~4V; this means that some voltage fluctuations on GS may cause the SiC tube to turn on by mistake; SiC devices switch quickly, which will generate a high dv/dt at the midpoint of the half-bridge, which will cause the Miller effect and cause crosstalk oscillations at the gate level; these oscillations may cause the SiC to turn on by mistake. In order to deal with the above problems, engineers often provide +18V and -5V auxiliary power supplies to SiC drivers. +18V can fully turn on SiC; -5V negative voltage bias can make it more difficult for SiC gate level to reach Vth upward, avoiding crosstalk causing SiC to turn on incorrectly. However, this approach will also bring two new problems: Negative voltage drive requires an additional winding for the flyback auxiliary source, which increases the difficulty of auxiliary source debugging, and increases the overall volume and cost; Some SiC GSs have weak tolerance to negative voltage, which may be only -8V; on the basis of -5V bias, if a negative crosstalk is superimposed, it may exceed the negative voltage tolerance range of SiC GS; this means that negative voltage bias will also bring new risks. MPQ18811 not only has a 30V power supply range, but also supports +18V and -5V auxiliary power supply; it also supports active Miller clamping function: When it is actively output low, it not only has a pull-down on VSS from the OUT pin, but also has a stronger and more direct pull-down on VSS from the CLAMP pin. The latter has lower impedance than the Gate path, because this path does not require a series gate-level resistor to suppress EMI radiation, and often has a shorter and more direct path on the layout. Therefore, it has lower parasitic inductance and parasitic resistance. With the support of the dual pull-down path, the gate level of the SiC device will be difficult to surge to Vth due to crosstalk, so it may be possible to save the negative voltage drive winding and avoid the two problems caused by the above negative voltage drive.

4. Innovative small-volume isolation module

1). Innovative small-volume isolation module MIE1W0505, etc.: MIE1W0505B is an isolated voltage-regulated DC/DC power supply module. It supports input voltage (VIN) applications as wide as 3V to 5.5V, which means it can support both 3.3V and 5V inputs; It supports 3.3V or 5V output voltages, and the output voltage can be flexibly set through the VSEL pin; Under the 5V to 5V setting, the output power (POUT) can reach 1W; The output voltage feedback is achieved by using capacitive isolation technology, so it has excellent load and input regulation, and the load regulation is within +/-0.4%; It has continuous short circuit protection (SCP) and over temperature protection (OTP); There are two packages: MIE1W0505BGLVH is a small size LGA-12 (4mmx5mm) package, which is suitable for occasions with insulation voltage less than or equal to 2.5kV, with smaller size and higher cost performance; MIE1W0505BGYMIE1W is a standard SOIC-16 WB package, which is suitable for occasions requiring 3kV/5kV insulation voltage. MIE1W0505BGLVH uses capacitive isolation technology to achieve feedback blocking, and can adjust the output voltage (VOUT) without the need for traditional optocouplers and TL431. Compared with traditional isolated power modules, its module size can be greatly reduced and its operation reliability is higher.