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Troubleshooting Widespread DC / DC Energy Begin-up Issues

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Troubleshooting Widespread DC / DC Energy Begin-up Issues

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– Commercial –

Are you experiencing points together with your DC/DC energy provide not beginning up correctly when designing your energy provide techniques? On this paper, we are going to type out the issues of the facility provide failing to start out or beginning improperly, analyze the explanations behind them, and supply options.

Widespread start-up failure of DC/DC Converter

The DC/DC energy provide is often put in on the PCB board after the AC/DC energy provide.  After we often design and use it, the primary concern is whether or not the facility provide may be output usually, and the way the load carrying capability.  Nonetheless, numerous issues usually come up throughout testing. The frequent ones are as follows:

  1. No output after the facility provide is turned on.
  2. The output retains hiccupping after the facility is turned on, and the system can not work correctly.

When encountering these points, how ought to we analyze, verify, and troubleshoot them? We’ll now analyze every drawback individually.

– Commercial –

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 facility provide inside the enter voltage vary specified within the datasheet.

Fig.1 Enter voltage specs within the datasheet (i.e. 30W DC/DC converter URB_YMD-10WR3)

2. Inadequate DC/DC converter energy

To find out this, calculate the precise energy of the output load and evaluate it with the facility of the front-end energy provide. If the facility of the DC/DC converter isn’t sufficient, take into account 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, verify the management logic of the CTRL pin in its datasheet and take a look at 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.

Fig. 2: Ctrl info within the datasheet (i.e. 30W DC/DC converter URB_LD-30WR3)

4. Reverse connection of the diode within the peripheral circuit

The output of the DC/DC energy provide is often related to electrolytic capacitors, voltage regulator diodes, and different peripheral gadgets with constructive and unfavourable terminals. It is very important keep away from reverse connection because it can lead to irregular output.

To find out if the module has an output, take a look at it individually. If the output of the module is regular however turns into irregular after including the peripheral circuit, verify every peripheral machine individually. To unravel the problem, appropriate the polarity of the output gadgets. and choose acceptable specs.

Moreover, if the chosen peripheral gadgets’ specs don’t meet the precise necessities, it could result in the poor output. Due to this fact, additionally it is essential to substantiate that the machine’s specs are acceptable after ruling out a reverse connection.

Fig. 3: The really useful peripheral circuit within the datasheet (i.e. 30W DC/DC converter URB_LD-30WR3)

Hiccup Output

Output failure is often brought on by capacitive masses which might be too excessive or by load transient energy that exceeds the facility provide specs.

1. Capacitive load exceeds specification

It is very important be aware that modules with totally 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 facility provide are inside the specification vary, it’s essential to verify the sum of all capacitance values. To resolve the problem of exceeding the capacitance specification, regulate the capacitive load or choose an influence provide that meets the mandatory specs of capacitance load.

Fig. 4: The capacitive load specs within the datasheet (i.e. 10W DC/DC converter URA_YMD-10WR3)

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 facility provide overcurrent level. If the start-up present exceeds the overcurrent level, then DC/DC energy module can not start-up usually. To resolve the problem, it is suggested to both select a module with increased energy or add the tender begin processing on the load aspect to restrict the start-up present.

Fig.5: Take a look at the transient load present on the output aspect with an oscilloscope

Abstract

This paper analyses frequent start-up issues encountered when utilizing DC/DC energy provides and gives corresponding affirmation strategies and options to cut back these points throughout 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 numerous functions and industries worldwide. MORNSUN gives a whole vary of companies, from product analysis and improvement to undertaking completion, guaranteeing that clients obtain an optimum resolution that mixes high quality, efficiency, design, supply, and after-sales service.

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