{"id":236,"date":"2023-01-10T19:08:04","date_gmt":"2023-01-10T19:08:04","guid":{"rendered":"http:\/\/www.skynext.tech\/?p=236"},"modified":"2023-08-22T10:41:24","modified_gmt":"2023-08-22T10:41:24","slug":"egmicro-egs00x-boards-review","status":"publish","type":"post","link":"https:\/\/www.skynext.tech\/index.php\/2023\/01\/10\/egmicro-egs00x-boards-review\/","title":{"rendered":"EGMicro EGS002 board review"},"content":{"rendered":"\n

The goal of this post is to analyze in detail the advertised features of the EGS002 board, and show possible modding hacks.<\/p>\n\n\n\n

The EGS002 board is the oldest provided by the EGMicro supplier still distributed on common Chinese reseller platforms. It superseded the even older EGS001.<\/p>\n\n\n\n

It is based on the EG8010 ASIC and also features either two IR2110S half bridge drivers, or two EG2113, an EGMicro driver. Whether you get one or the other depends on the reseller. Check for comments and reviews on marketplace product page to see who’s getting what.<\/p>\n\n\n\n

Most if not all all of the EGS002 information is also provided in the EG8010 datasheet, plus many more details! We will use the EG8010 datasheet as the reference material, but also compare them to the EGS002 board features, to see what features are restricted by the board.<\/p>\n\n\n\n

<\/p>\n\n\n\n

EG8010 ASIC Features<\/strong><\/h4>\n\n\n\n

Input DC Voltage. <\/strong>The EGS002 can drive high voltage MOSFETs easily. no restrictive voltage limitations on the high side MOSFETs, and it is at least ok for 400V DC input to the MOSFET bridge. Supplied design schematics show power coming through a 400V DC link PFC output.<\/p>\n\n\n\n

Inverter output frequency.<\/strong> EG8010 can be used for fixed 50Hz,60Hz or frequency adjustable 0~100Hz or 0~400Hz output.<\/p>\n\n\n\n

The EGS002 on the other hand restricts this feature to fixed frequency operation : either 50Hz or 60Hz, through jumpers.<\/p>\n\n\n\n

These jumpers are exposed on the bottom plane of the board and are set with solder bridges over two pads. They do not appear to be through hole, so it would be difficult to insert header pins and use a real jumper there.<\/p>\n\n\n\n

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the backside exposes the configuration jumpers. top left of image<\/figcaption><\/figure>\n\n\n\n

JP1 and JP5 on the board control FREQSEL0 pin 18 <\/strong>level (either HIGH=JP1 short for 60Hz or LOW=JP5 short for 50Hz). They can’t be short or open at the same time !!<\/p>\n\n\n\n

Is the board moddable for further frequency control ? let’s see.<\/p>\n\n\n\n

There seems to be two methods to apply mods. Either through hardware or through software (by serial commands). Let’s explore the hardware method first.<\/p>\n\n\n\n

Variable Frequency mode modification<\/strong><\/h4>\n\n\n\n

Up to 100Hz or up to 400Hz variable frequency operation mode selection is controlled by FREQSEL1. It seems however that the EGS002 has the FREQSEL1 pin 19<\/strong> grounded in the EGS002 schematic. So it depends on the suppliers of EGS002 to create derivative boards that expose FREQSEL1.<\/p>\n\n\n\n

As far as I searched on Chinese marketplaces that doesn’t seem to be the case.<\/p>\n\n\n\n

<\/p>\n\n\n\n

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PIN 19 and PIN 20 Traces Merge. right around the center of R33. Processed image to better expose the traces<\/figcaption><\/figure>\n\n\n\n

FREQSEL1 pin 19 and MODSEL pin 20. seem both connected to ground in most boards available on the market through merging traces. This is in conformity with the EGS002 datasheet.<\/p>\n\n\n\n

That restricts the unmodded board to 50\/60 Hz Operation and Unipolar switching<\/strong><\/p>\n\n\n\n

Modding for tests to enable VVVF to 100 Hz or to 400 Hz would require cutting the FREQSEL1 pin trace and patching the pin with maybe AWG30 hookup wires and connect it to HIGH level. MODSEL would be still kept to GND.<\/p>\n\n\n\n

JP1 and JP5 would allow to control max frequency to 100Hz or 400Hz.<\/p>\n\n\n\n

Note that variable frequency with constant voltage mode and variable frequency with variable voltage both require Unipolar switching.<\/strong> That is why you don’t have to bother with MODSEL in this mod<\/strong><\/p>\n\n\n\n

Once FREQSEL1 is set to HIGH, Variable frequency mode type<\/strong> is enabled through VVVF pin 32. In EGS002 again, it is connected to ground. This mode would give EGS002 the variable frequency constant voltage mode by default. (without further mods)<\/p>\n\n\n\n

To enable VVVF variable freq\/variable voltage (albeit with constant V\/F ratio) for single phase VFD applications, bring VVVF to HIGH<\/strong><\/p>\n\n\n\n

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Pin 32 VVVF. For variable frequency mode in unipolar switching<\/figcaption><\/figure>\n\n\n\n

Again, the trace after the pin may be cut if other pins do not depend on the cut trace, which may be difficult to check since some trace may hide under the IC.<\/p>\n\n\n\n

Note that there are several test points \/ open vias on the board that can be used to patch the board with additional connections.<\/p>\n\n\n\n

Then you have to expose FRQADJ\/VFB2<\/strong> pin to set the desired frequency<\/strong> in variable frequency mode through an external potentiometer in figure 8.6a of the datasheet. Voltage regulation is still performed through R23 and VFB1<\/strong><\/p>\n\n\n\n

In constant voltage\/frequency ratio mode, you use R23 to set the nominal voltage at 50Hz through VFB1<\/strong> Frequency ratio control goes through FRQADJ\/VFB2<\/strong> in this mode. It is a bit unclear in the datasheet.<\/strong><\/p>\n\n\n\n

<\/p>\n\n\n\n

Bipolar SPWM enable modification<\/strong><\/h4>\n\n\n\n

Remember that you cannot use VVVF features in this mode.<\/p>\n\n\n\n

The mod would require :<\/p>\n\n\n\n