Power factor correction circuit
A power factor correction and circuit technology, which is applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve the problems of low switching frequency, high cost, and poor current harmonic suppression effect of power correctors, etc., to achieve Good current harmonic suppression effect, good power factor correction effect, and reduced switching frequency effect
Active Publication Date: 2015-07-29
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
Due to the low switching frequency of this power corrector, a large inductor is required, so the cost is high, and its current harmonic suppression effect is poor
Some companies have proposed a fast-switching power factor corrector, which uses an average current algorithm to realize fast switching control of the IGBT, and has good power factor correction and current harmonic suppression effects. The operating frequency is higher, so the switching loss is larger, and the temperature rise of the switching device is higher
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[0031] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0032] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.
[0033] figure 1 A schematic structural diagram of a power factor correction circuit according to an embodiment of the present invention is shown.
[0034] Such as figure 1 As shown, the power fact...
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The invention provides a power factor correction circuit. The power factor correction circuit comprises: a switch assembly which comprises multiple switch devices in parallel connection; a sampling circuit for acquiring current parameter information and voltage parameter information in the power factor correction circuit; and a controller which is connected to the sampling circuit, is respectively connected with the control ends of the multiple switch devices, and according to the voltage parameter information and the current parameter information, respectively sends control signals to the multiple switch devices so as to enable the multiple switch devices to work alternatively. Through the technical scheme provided by the invention, the switch frequency of a single switch device is greatly reduced, the temperature rise of the switch devices is greatly reduced, and the reliability of the switch devices is improved.
Description
technical field [0001] The present invention relates to the technical field of power factor correction, in particular to a power factor correction circuit. Background technique [0002] In order to reduce the pollution of current harmonics and reactive power generated by electrical equipment to the power grid, my country has promulgated national standards to limit the current harmonics of electrical equipment, and electrical equipment can only enter the market if it meets the corresponding harmonic standards. In order to use electrical equipment to meet harmonic standards, power factor correction (Power Factor Correction, PFC) needs to be performed on it. [0003] In order to improve the power factor of electrical appliances and reduce current harmonics, some companies have proposed a power factor corrector that performs chopping on the AC side. The step-up switch operates several times to achieve the purpose of increasing the current conduction angle and reducing the input...
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IPC IPC(8): H02M1/42H02M1/12
CPCH02M1/12H02M1/4208H02M1/0054Y02B70/10
Inventor 张国柱
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD