High-frequency switching power supply module loop control unit
Technical field
The utility model relates to a kind of control circuit of high frequency switch power, particularly a kind of high-frequency switching power supply module loop control unit.
Background technology
High frequency switch power has been many indispensable power supplys of DC power supply environment that need to use.Existing high frequency switch power is owing to be subjected to the variation of extraneous input supply voltage or the variation of load size, and makes the output voltage of the DC power supply that high frequency switch power provides change, and influenced work.For this reason, people use loop control unit, i.e. feedback circuit in high-frequency switching power supply module; can make high frequency switch power not cause the variation of output voltage because of the variation of load; improve the serviceability of high frequency switch power greatly, simultaneously, protected the equipment that uses power supply.Yet, the electronic component of existing feedback circuit is mounted in the copper-clad plate commonly used (PCB), after working long hours, electronic component can generate heat, and the copper-clad plate heat transfer is slower, can not in time heat be distributed, and makes temperature of electronic component constantly raise, thereby making electronic component produce temperature floats, and can make electronic component damage or to make the stability of electronic component and reliability to descend greatly at a high speed, influence the performance and the precision of whole loop, and then influenced the performance and the precision of whole Switching Power Supply.
The utility model content
Technical problem to be solved in the utility model provides a kind of high-frequency switching power supply module loop control unit that can in time heat be distributed.
In order to solve the problems of the technologies described above, the utility model provides a kind of loop control unit of high-frequency switching power supply module circuit, it is characterized in that, the electronic component of its circuit is arranged on the ceramic wafer, the metal connecting line is set on described ceramic wafer, electronic component is fixed on the described ceramic wafer, and connects by described metal wire.
The high-frequency switching power supply module loop control unit that the utility model provides, guarantees that temperature of electronic component works long hours also can not raise even the heat that electronic component is produced distributes because sub-element is arranged on the ceramic wafer.Thereby improved, thereby reduced " null offset " of electronic component, guaranteed the stability and the reliability of electronic component, improved the service behaviour of whole loop.
Description of drawings
Fig. 1 is the circuit diagram of loop control unit of the present utility model.
Fig. 2 is the structural representation of loop control unit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.
Referring to Fig. 1, loop control unit 1 comprises a feedback circuit 11, short circuit retraction circuit 12, current-limiting circuit 13.Short circuit retraction circuit 12 is to prevent that load is short-circuited, and burns entire circuit.In case be short-circuited, short circuit retraction circuit 12, meeting reduce current reference automatically, and the power consumption of Switching Power Supply when short circuit reduced.Current-limiting circuit 13 is when load is excessive when causing that electric current is excessive, the output current of restricting circuits.When output voltage is higher or on the low side, feedback circuit 11 is by the ON time of the electronic switch of control switching circuit, thereby the input dc pulse voltage (the not shown in the figures meaning out) of control isolating transformer, when output voltage is on the low side or higher, conduction time lengthening or shortening makes the volume voltage of output keep stable.
Referring to Fig. 2, the electronic component of the loop control unit 1 of the high-frequency switching power supply module circuit that the utility model provides is arranged on the ceramic wafer 2, and metal connecting line (the not shown in the figures meaning out) is set on ceramic wafer 2, and this metal connecting line can adopt copper or silver.Ceramic wafer 2 is provided with above-mentioned welded disc, and above-mentioned electronic component is fixed on the welded disc of described ceramic wafer, and is connected by metal wire.
Certainly,, do not spend performing creative labour, on the basis of the foregoing description, can do multiple variation, can realize the purpose of this utility model equally for one of ordinary skill in the art.But this variation obviously should be in the protection range of claims of the present utility model.