Variable frequency air conditioner and over-current protective circuit of power factor correction (PFC) circuit
A power factor correction and over-current protection technology, which is applied in the direction of emergency protection circuit devices and electrical components, can solve the problems of incorrect protection of the charging current of electrolytic capacitors and the inability to realize over-current protection, so as to improve reliability and avoid damage Effect
Active Publication Date: 2016-02-17
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology
However, its disadvantages are that the charging current of the electrolytic capacitor is likely to cause false protection, and the overcurrent protection cannot be realized when the hardware comparison circuit fails.
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[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0022] The following describes the overcurrent protection device of the power factor correction PFC (Power Factor Correction, power factor correction) circuit in the inverter air conditioner and the inverter air conditioner proposed by the embodiments of the present invention with reference to the accompanying drawings.
[0023] Among them, according to Figure 1-3 As an example, an inverter air conditioner may include a rectifier circuit 10, a PFC circuit 20, a compressor 30, and a compressor driver 31, wherein the input termina...
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The invention discloses a variable frequency air conditioner and an over-current protective circuit of a power factor correction (PFC) circuit. The over-current protective circuit comprises a PFC driver, a current detection unit, a comparison unit, and a microcontroller. The PFC driver is used for driving the PFC circuit. The current detection unit is used for detecting the input current of the PFC circuit in order to acquire the instantaneous value of the complete input current of the variable frequency air conditioner. The comparison unit is used for generating an over-current protective signal according to the instantaneous value of the complete input current. The microcontroller is used for receiving the over-current protective signal, sampling the instantaneous value of the complete input current, outputting a PFC control signal to the PFC driver, and outputting a compressor control signal to a compressor driver. The PFC driver drives the PFC circuit according to the over-current protective signal and the PFC control signal. The microcontroller controls the output states of a PFC signal output end and a compressor signal output end according to the over-current protective signal and the instantaneous value of the complete input current. Accordingly, dual protection is provided for the PFC circuit in hardware and software aspects, the PFC circuit is prevented from being damaged by over-current, and system reliability is improved.
Description
technical field [0001] The invention relates to the technical field of air conditioners, in particular to an overcurrent protection circuit of a power factor correction PFC circuit in an inverter air conditioner and an inverter air conditioner. Background technique [0002] Inverter air conditioners have been widely used. In order to reduce current harmonics and improve power factor, most of the electric control boards of inverter air conditioners use active power factor correction PFC circuits. The tube is damaged. [0003] In related technologies, the following overcurrent protection strategy is usually adopted: detect the input current of the whole machine, and compare the input current of the whole machine with the current protection threshold through a hardware comparison circuit to generate an input overcurrent protection signal. When the protection threshold is reached, the driving signal of the PFC circuit and the driving signal of the compressor are turned off. Ho...
Claims
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Inventor 黄招彬张国柱
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD