Power supply circuit and switching power supply
A technology of power supply circuit and switching power supply, applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problems of high cost and large volume of switching power supply, and achieve the effect of simple structure and reduced production cost
Active Publication Date: 2015-07-15
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology
[0006] In view of this, the present application provides a power supply circuit to solve the problem that the power supply circuit in the prior art needs to use a start-up resistor to provide a start-up current, which causes the switching power supply to be too bulky and costly
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[0031] For the power supply circuit of the switching power supply in the prior art, a starting resistor directly connected to the input voltage needs to be used, and the starting resistor receiving a high voltage can only be arranged in an external circuit, resulting in a large volume of the switching power supply, For the problem of high cost, this application provides a new power supply circuit for switching power supply.
[0032] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0033] figure 2 It is a structural diagram of the power supply ...
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The invention discloses a power supply circuit applied to a switching power supply and the switching power supply. The power supply circuit comprises a first transistor and a first diode, wherein a drain electrode of the first transistor connected with an input power supply; an anode of the first diode is connected with a source electrode of the first transistor, and a cathode of the first diode is grounded through a bias capacitor. A gate electrode of the first transistor is respectively connected with the cathode of the first diode and the power input end of a power supply object. The first transistor is a power tube capable of being conducted when the gate-to-source voltage is zero. As can be seen, the structure of the power supply circuit is simple, the switching power supply using the power supply circuit does not need a start resistor, integration of the switching power supply is facilitated, and thus the production cost of the switching power supply is reduced.
Description
technical field [0001] The present application relates to the technical field of system power supply, and more specifically, to a power supply circuit and a switching power supply using the power supply circuit. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of switching on and off to maintain a stable output voltage. At present, the circuit structure of the more commonly used switching power supply includes power stage circuits and control circuits. Also included is a supply voltage generating circuit for powering the control circuit. [0003] figure 1 It is a structural diagram of a switching power supply in the prior art. [0004] See eg figure 1 , figure 1 The main circuit of the switching power supply adopts a flyback isolated topology. The switching power supply includes a power supply generating circuit 101, a power stage circuit 102 and a control circuit 103. T...
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IPC IPC(8): H02M1/36H02M3/335H02M3/155
CPCH02M1/36H02M3/158H02M1/0006
Inventor 金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD