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PFC circuit and method for dynamically adjusting switching frequency

A switching frequency, dynamic adjustment technology, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., can solve problems such as damage to power switching devices, reduce switching frequency, increase switching frequency, reduce Effect of Current Ripple

Active Publication Date: 2021-03-02
RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a PFC circuit and method for dynamically adjusting the switching frequency, which is used to solve the problem in the prior art that the power switching device is damaged due to excessive temperature

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  • PFC circuit and method for dynamically adjusting switching frequency
  • PFC circuit and method for dynamically adjusting switching frequency
  • PFC circuit and method for dynamically adjusting switching frequency

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Embodiment Construction

[0022] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, so only the components related to the present invention are shown in the drawings rather than the number, shape and Dimensional drawin...

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Abstract

The invention provides a PFC circuit and method for dynamically adjusting switching frequency, and the circuit comprises a PFC control chip, and a switching frequency programming pin of the PFC control chip is externally connected with an equivalent resistor Rf; the PFC control chip is grounded based on a grounding pin, is connected with the Vcc based on a power supply pin to supply power, and isconnected with a gate pole Gate of a power switching device of the PFC circuit based on a driving signal output pin; and the equivalent resistor Rf is composed of a first fixed resistor R1, a second fixed resistor R1 and a PTC resistor RPTC, and the resistance value of the equivalent resistor Rf is determined by the temperature of the power switch device according to the resistance value of the PTC resistor RPTC. According to the power switching device for protecting the PFC circuit, the switching frequency is improved and the current pulsation in the switching period is reduced during light load, so that the current ripple rate, the current ripple and the EMC noise are reduced, and the switching frequency, the switching loss and the temperature rise of the power switching device are dynamically reduced in real time according to the temperature rise of the power switching device during heavy load; and power switching device lifetime is enhanced.

Description

technical field [0001] The invention relates to the technical field of PFC circuits, in particular to a PFC circuit and method for dynamically adjusting switching frequency. Background technique [0002] In industrial power electronic circuits, many chip suppliers provide a variety of integrated control chips using power factor correction (PFC), such as Texas Instruments (TI) UCC28180. In this type of PFC control chip, the frequency of the drive signal used to drive the power switching device: MOSFET or IGBT is often designed through resistance programming to design the switching frequency. In the application process, once the resistance is determined, the switching frequency is often fixed, and there are many disadvantages in the application process. [0003] When the load of the PFC circuit is light, the load current is small, and the temperature rise of the power switching device is generally not high. However, due to the relatively low switching frequency, the harmonic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/32
CPCH02M1/4225H02M1/32Y02B70/10
Inventor 许德强饶葳
Owner RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
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