Media Report | InnoMux™-2 Constant Voltage and Constant Current Output Flyback Power Supply Actual Measurement
The article is reproduced from "Electronic Engineering World", September 20
This time I got the DER-714 test board, which is a test board with 1 constant voltage and 1 constant current output. The main chip is InnoMux2-EP IMX2268C.
The basic information of DER is as follows:
The actual photos are as follows.
DER-714 test board front
Back of DER-714 test board
DER-714 Schematic
InnoMux™-2 does not have a DC-DC converter, and directly outputs two DC voltages and currents from AC. Therefore, the circuit structure is relatively simple, and in addition to InnoMux™-2, it mainly consists of passive components.
The input wiring of the test board is relatively simple, and the AC input range is 90-265V. We have taken 4 common typical values and limit values. They are:
4、250V/50Hz
The output includes 12V constant voltage load and 380 mA constant current load. The constant current load uses LED light string.
In addition, the output of the LED light string is configured with PWM dimming control signal according to the document.
The specific wiring method is shown in the figure below.
DER-714 Test Wiring Diagram
The actual test environment is as follows:
Here, the output conditions of no load, CV full load only, CC full load only, and full load are tested under four AC input conditions. The measured results are summarized in the following table.
For comparison, the following screenshot shows the efficiency recorded in the DER document.
First, observe the output accuracy, all of which are within the allowable error range.
Then observe the no-load condition, the no-load power consumption is very low, the maximum no-load power consumption is only 0.095W. According to this power consumption, it only consumes about 0.8 degrees of electricity after one year of power supply, which helps the electrical appliances meet the requirements of green environmental protection.
The lowest efficiency measured is 85.27% at 90V/60Hz input and full load output.
The highest efficiency occurs at 250V/50Hz input and full load output, and the maximum efficiency is 88.80%.
This result is 1 to 2 percentage points higher than the result recorded in the DER document. It can be seen that InnoMux™-2 can indeed achieve high efficiency, low no-load power consumption, and high-precision multi-channel output.
The ripple test here uses the oscilloscope connection method recommended by DER, as shown in the figure below.
The test results are shown in the figure below.
The maximum ripple occurs at full load at 90V/60Hz input, which is 90.40mV, which is not much different from the results in the DER document.
The corresponding 12 waveform graphs are shown below.
Under full load, a thermal imager was used to record the temperature of the entire board. The results are as follows.
Refer to the RGB diagram to find the location of high-temperature components:
The maximum temperature at full load is 77.9 degrees, with a temperature rise of about 47.9 degrees. This result is better than the result recorded by DER.
The highest temperature is not on the main chip InnoMux™-2 IMX2268C, but on the SR diode D8. The ambient temperature of this experiment is 30 degrees Celsius. When the ambient temperature is higher than the standard temperature, the temperature rise performance is still better than expected.
This article verifies the specific performance indicators of the InnoMux™-2 constant voltage and constant current output flyback power supply through actual measurement. It can be found that the InnoMux™-2 solution does have the characteristics of high efficiency, low no-load power consumption, and high-precision multi-channel output, and the performance indicators are even better than the values in the DER document. In
order to further explore the performance of the InnoMux™-2 solution in actual applications, we conducted a long-term stress test on it. The test results show that the solution shows excellent stability under continuous working conditions, and its temperature control performance is particularly outstanding, and it can maintain a low temperature rise even in high temperature environments. These comprehensive performances make InnoMux™-2 a very competitive solution in the field of power supply design.
Related reading:
1. InnoMux-2 obtains safety certification in major global markets
2. PI launches InnoMux-2 high-precision multi-output power supply solution
To learn more about PI’s solutions, visit power.com or read the original article.
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