Isolated switch converter as well as controller and control method thereof

A switching converter and controller technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, high-efficiency power electronic conversion, etc., can solve the damage of switching power supply and increase the possibility of pass-through , reduce the efficiency of switching power supply and other issues, to avoid the effect of pass-through

Active Publication Date: 2014-01-01
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The existing intelligent synchronous rectification technology turns off the secondary switching tube after the primary switching tube is turned on, which easily leads to the simultaneous conduction of the primary switching tube and the secondary switching tube (shoot through), reducing the efficiency of the switching power supply or even Damage to switching power supply
Moreover, in the actual circuit, due to the MOSFET's own characteristics and the delay of the control circuit, it takes a while from Vds increasing to greater than -70mV until the secondary switch is turned off, which undoubtedly further increases the possibility of direct connection

Method used

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  • Isolated switch converter as well as controller and control method thereof
  • Isolated switch converter as well as controller and control method thereof
  • Isolated switch converter as well as controller and control method thereof

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Embodiment Construction

[0024]Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0025] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in one...

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Abstract

The invention discloses an isolated switch converter as well as a controller and a control method thereof. The control method comprises the following steps of: sampling an output signal of the switch converter so as to generate a feedback signal; based on the difference between the feedback signal and a reference signal, generating a compensation signal; comparing the compensation signal with a modulation signal so as to generate a first comparison signal; detecting whether a primary switch tube is turned off, and then generating a primary turnoff detection signal; based on the primary turnoff detection signal and the first comparison signal, generating a secondary control signal to control a secondary switch tube; sending the first comparison signal to an isolating circuit so as to generate a synchronization signal isolated from the first comparison signal; based on the synchronization signal, generating a primary control signal to control the primary switch tube.

Description

technical field [0001] The present invention relates to an electronic circuit, in particular to an isolated switch converter and its controller and control method. Background technique [0002] Synchronous rectification is a technology that uses power metal-oxide-semiconductor field-effect transistors (MOSFETs) to replace rectifier diodes to reduce losses, and it can greatly improve the efficiency of switching power supplies. The power MOSFET is a voltage-controlled device, and its volt-ampere characteristic is linear when it is turned on. When using a power MOSFET as a rectifier, it is required that its gate voltage must be synchronized with the phase of the rectified voltage. [0003] figure 1 It is the waveform diagram of the existing intelligent synchronous rectification technology, wherein Vds is the drain-source voltage of the secondary switching tube, Isec is the current flowing through the secondary winding, and CTRLS is the control signal of the secondary switchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/38H02M7/217
CPCH02M3/33592Y02B70/10
Inventor 王斯然杨志江约翰·维根霍恩赵启明
Owner CHENGDU MONOLITHIC POWER SYST
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