Are you experiencing points together with your DC/DC energy provide not beginning up correctly when designing your energy provide programs? On this paper, we are going to type out the issues of the ability provide failing to begin or beginning improperly, analyze the explanations behind them, and supply options.
Frequent start-up failure of DC/DC Converter
The DC/DC energy provide is usually put in on the PCB board after the AC/DC energy provide. Once we normally design and use it, the primary concern is whether or not the ability provide may be output usually, and the way the load carrying capability. Nevertheless, varied issues usually come up throughout testing. The widespread ones are as follows:
- No output after the ability provide is turned on.
- The output retains hiccupping after the ability is turned on, and the system can’t work correctly.
When encountering these points, how ought to we analyze, verify, and troubleshoot them? We’ll now analyze every drawback individually.
No Output
There are sometimes a number of causes for “No output” from an influence provide.
1. The enter voltage could also be too excessive or too low
To find out this, use a multimeter to measure the voltage at each ends of the enter terminal and evaluate it to the enter voltage vary within the information sheet (e.g. 9-36V). If the voltage exceeds the desired vary, make the mandatory changes. Present energy to the ability provide inside the enter voltage vary specified within the datasheet.
2. Inadequate DC/DC converter energy
To find out this, calculate the precise energy of the output load and evaluate it with the ability of the front-end energy provide. If the ability of the DC/DC converter just isn’t sufficient, contemplate changing it with a better energy one or lowering the load energy.
3. The CTRL operate has a management logic error (for the DC/DC energy module with CTRL pin)
To find out this, test the management logic of the CTRL pin in its datasheet and check the precise state of the CTRL pin. Whether it is set incorrectly, observe the directions within the datasheet to design the CTRL pin and make sure that the management logic is appropriate.
4. Reverse connection of the diode within the peripheral circuit
The output of the DC/DC energy provide is normally linked to electrolytic capacitors, voltage regulator diodes, and different peripheral units with optimistic and damaging terminals. You will need to keep away from reverse connection because it can lead to irregular output.
To find out if the module has an output, check it individually. If the output of the module is regular however turns into irregular after including the peripheral circuit, test every peripheral machine individually. To unravel the difficulty, appropriate the polarity of the output units. and choose acceptable specs.
Moreover, if the chosen peripheral units’ specs don’t meet the precise necessities, it might result in the poor output. Due to this fact, it’s also essential to verify that the machine’s specs are acceptable after ruling out a reverse connection.
Hiccup Output
Output failure is usually attributable to capacitive hundreds which are too excessive or by load transient energy that exceeds the ability provide specs.
1. Capacitive load exceeds specification
You will need to be aware that modules with completely different output voltages have various capacitive load specs. To find out whether or not the capacitance values of all capacitors on the output aspect of the ability provide are inside the specification vary, it’s essential to test the sum of all capacitance values. To resolve the difficulty of exceeding the capacitance specification, regulate the capacitive load or choose an influence provide that meets the mandatory specs of capacitance load.
2. Extreme transient energy of the load (e.g. motor, and many others.)
To check the transient load present on the output aspect, use an oscilloscope and evaluate it with the ability provide overcurrent level. If the start-up present exceeds the overcurrent level, then DC/DC energy module can’t start-up usually. To resolve the difficulty, it is strongly recommended to both select a module with greater energy or add the comfortable begin processing on the load aspect to restrict the start-up present.
Abstract
This paper analyses widespread start-up issues encountered when utilizing DC/DC energy provides and gives corresponding affirmation strategies and options to cut back these points in the course of the design section. MORNSUN is a producer of energy provide options, providing DC/DC converters, AC/DC converters, enclosed AC/DC SMPS, Din-rail AC/DC SMPS for varied functions and industries worldwide. MORNSUN gives a whole vary of companies, from product analysis and growth to undertaking completion, making certain that clients obtain an optimum resolution that mixes high quality, efficiency, design, supply, and after-sales service.
