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Switch tube control method, device and air conditioner

A control method and control device technology, applied in the field of control methods of air conditioners, devices, and switching tubes, can solve the problems of unavailable and difficult to achieve global universal use

Active Publication Date: 2020-01-14
GD MIDEA AIR CONDITIONING EQUIP CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In the active PFC circuit, fixed carrier frequency and voltage control parameters are generally used, but because different countries and regions use different standard grid parameters, a single carrier frequency and voltage control parameters cannot be well adapted to different grids characteristics, so the best EMI (Electro Magnetic Interference, electromagnetic interference) and EMC (Electro Magnetic Compatibility, electromagnetic compatibility) effects cannot be obtained, and it is difficult to achieve global universal use

Method used

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  • Switch tube control method, device and air conditioner
  • Switch tube control method, device and air conditioner
  • Switch tube control method, device and air conditioner

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Embodiment Construction

[0061] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] The invention proposes a control method for a switch tube, which is applied to a PFC circuit.

[0063] The power factor of a traditional single-phase power supply system can be defined as: the ratio of the average power (active power) actually consumed by the load to the measured apparent power, where the active power is the ratio of the instantaneous voltage to the instantaneous The average value of the product of the current over time, such as figure 1 As shown, in this circuit, the capacitor EC is usually a large capacitor, and the slow discharge characteristic of the large capacitor is used to make the load across a stable DC voltage. If the power switch tube Q does not operate, the input current can only flow when the input voltage is greater than the output voltage. In order to make the input current not...

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Abstract

The invention discloses a control method and device of a switch tube and an air conditioner. When the control method is used, a frequency of an input power supply of a power factor correction (PFC) circuit is periodically acquired, a switch frequency of a power switch tube is set, an output duty ratio of the power switch tube is calculated according to an AC voltage value an AC current value, which are acquired, of the input power supply of the PFC circuit and an acquired DC bus voltage value, and the power switch tube is driven to be periodically switched off or switched on according to the switch frequency and the output duty ratio. By the control method, the switch-on and the switch-off of the power switch tube can be controlled according to different frequencies of the input power supply, the power factor of the PFC circuit is increased, so that the optimal electro magnetic interference (EMI) effect is achieved.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a control method and device for a switching tube and an air conditioner. Background technique [0002] At present, in the frequency conversion air conditioner products, in order to reduce the current carrier and improve the power factor, an active PFC (Power Factor Correction, power factor correction) circuit is usually used. In the active PFC circuit, fixed carrier frequency and voltage control parameters are generally used, but because different countries and regions use different standard grid parameters, a single carrier frequency and voltage control parameters cannot be well adapted to different grids characteristics, so the best EMI (Electro Magnetic Interference, electromagnetic interference) and EMC (Electro Magnetic Compatibility, electromagnetic compatibility) effects cannot be obtained, and it is difficult to achieve global universal use. Contents of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44H02M1/42
CPCH02M1/4258H02M1/44Y02B70/10
Inventor 梁国强
Owner GD MIDEA AIR CONDITIONING EQUIP CO LTD
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