Hep the 4 big reasons that cause power source module to give out heat
[introduction] the face that touchs power source module, of warm, is module bad? Wait a moment, a bit give out heat, just working hard because of it merely. But high temperature is extremely big to the dependability influence of power source module! Be based on power source module to heat up the knowledge of the design, this, we gather up the cause that causes power source module to give out heat.
Touch the face of power source module, of warm, is module bad? Wait a moment, a bit give out heat, just working hard because of it merely. But high temperature is extremely big to the dependability influence of power source module! Be based on power source module to heat up the knowledge of the design, this, we gather up the cause that causes power source module to give out heat.
Power source module has energy loss in voltage transition, generation heat energy brings about module to give out heat, reduce the changeover efficiency of power source, module of influence power source works normally, and may be affected all round the function of other parts of an apparatus, this kind of circumstance needs the platoon on the horse to check. But the meeting below what circumstance creates power source module calorific and serious? Specific reason is shown as follows:
One, those who use is linear power source
Principle of job of linear power source pursues as follows 1, adjust change tubal RW to output the size of voltage through adjusting. Because adjust a canal to be equivalent to a resistor, the meeting when electric current passes resistor is calorific, bring about efficiency not tall.
Graph graph of principle of 1 linear power source
Give out heat to prevent power source module serious, can take the following step: Increase carbon fin, execute wind material of cold, heat conduction is solved (fill of fat of heat conduction silicon, heat conduction seals glue) , convert switch power source.
2, load is too small
Power source carries gently, namely impedance of load of power source circuit is bigger, at this moment power source is smaller to laden output electric current. What power supply does not allow in circuit of some power source is light carry, the dc job voltage that can make power source circuit is outputted otherwise is a lot of more elevatory, build the attaint of circuit of didymous power source. Module of common power source has the smallest laden restriction, each manufacturer differs somewhat, it is generally 10% the left and right sides.
If output is laden too light, the proposal carries paralell connection in output a false laden resistor, if pursue,2 are shown. Power of this false laden resistor adds the sum of actual and laden power>10% load.
Graph 2 load are too small, shunt-wound holiday is laden
3, load flows too
Power source overload, record a case gently with power source apropos and contrary, the short circuit of laden circuit existence that is power source circuit, make power source circuit exports very big electricity, and exceeded power supply can susceptive limits.
Shed power source module of protection to been not have, output need stabilized voltage, press too had reached those who shed protection the simplest method is inputting the linear manostat that one belt receives to shed protection too outside end namely, if pursue,3 are shown.
Graph 3 load flow too, increase linear manostat
4, environmental temperature exorbitant or medicinal powder heat is undesirable
Before use module power source, the temperature order and degree that considers power source module without fail and the working temperature range that need actually. Undertake according to laden power and actual environmental temperature the forehead is designed falling.