Serial resonant switching power supply
A technology of series resonance and switching power supply, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc. It can solve the problems of power supply not starting, circuit protection malfunction, and no soft-start reset circuit, etc., so as to improve reliability and applicability Effect
Inactive Publication Date: 2013-02-27
张家港华峰电接插元件有限公司
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Problems solved by technology
The power supply efficiency of this chip is high, and the circuit is relatively simple. The circuit has a soft-start circuit for power-on, but there is no soft-start reset circuit. When the power supply is cut off or the load is short-circuited, when the power is turned on again immediately, it is easy to cause circuit protection errors. The action makes the power supply not start or the power supply is internally locked, and finally the power supply has no output. It needs to be powered off and restarted to resume work.
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[0015] Below in conjunction with accompanying drawing, preferred specific embodiment of the present invention is described:
[0016] Such as figure 2 Shown is a schematic diagram of a switching power supply, which is mainly composed of an LLC resonant converter chip 1 , a transformer 2 , a rectifier circuit 3 , a voltage stabilizing circuit 4 and a delay restart circuit 5 . The high-voltage DC power supply 6 of the LLC resonant converter chip 1 is converted by the previous stage voltage conversion circuit (not shown in the figure), that is, when the power supply is turned on, the high-voltage AC power supply is converted into a high-voltage DC power supply by the voltage conversion circuit and input to the LLC The resonant converter 1, the LLC resonant converter 1 converts the high-voltage direct current power into alternating current with a set frequency and then inputs it to the transformer 2, and outputs it to the load through the transformer 2.
[0017] The rectify...
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The invention relates to a serial resonant switching power supply which mainly comprises an LLC (Logical Link Control) resonant converter chip, a transformer, a rectifying circuit and a voltage-stabilizing circuit, wherein the LLC resonant converter chip is used for receiving a high-voltage direct-current power supply and converting the power supply into set frequency alternating current input to the transformer, and the LLC resonant converter chip is internally provided with a power-on soft-start circuit. The switching power supply also comprises a time-delay restart circuit which comprises a voltage comparison circuit connected between the output end of the high-voltage direct-current power supply and the voltage-stabilizing circuit, a time delay circuit and a switching control circuit, wherein when the voltage comparison circuit samples high-voltage direct-current voltage and normally outputs the voltage once again, the switching control circuit switches off the working voltage output to the LLC resonant converter chip by the voltage-stabilizing circuit in the time-delay time of the time delay circuit; and because the time-delay restart circuit is added, the switching power supply can be subjected to the soft start of the LLC resonant converter chip when being started every time, thereby the condition of non-start of the power supply or lock in the power supply is avoided, and the reliability of the switching power supply is improved.
Description
technical field [0001] The invention relates to a switching power supply, in particular to a switching power supply using an LLC series resonant converter chip with a soft start circuit. Background technique [0002] In the existing switching power supply, the FSFR2100 series resonant converter is mostly used, which is a high-efficiency LLC resonant converter, which can realize the zero-voltage soft switching (ZVS) of the primary side switching tube under full load, and the secondary side rectifier diode The voltage stress is low, so high output voltage applications can achieve high efficiency, etc. These advantages make LLC resonant converters especially suitable for high output voltage applications, and can be used in LED drive power supplies such as LED street lamps and LED floodlights, and switching power supplies for LCD TVs (LCD TVs) and plasma TVs (PDP TVs). figure 1 Shown is the circuit diagram for its specific application. The power supply efficiency of this chip ...
Claims
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IPC IPC(8): H02M3/335H02M3/338H02M1/36
Inventor 赵晖马敬义
Owner 张家港华峰电接插元件有限公司