Overcurrent protection circuit, control method and air conditioner of intelligent power module
A technology of intelligent power module and overcurrent protection circuit, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as damage to IPM modules, and achieve the effects of reliable cost, avoidance of damage, and simple circuit
Active Publication Date: 2019-10-29
WUHU MATY AIR CONDITIONING EQUIP CO LTD +1
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Problems solved by technology
[0003] When the Microcontroller Unit (MCU) that controls the IPM module breaks down and makes the insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) of a certain bridge arm inside the IPM module conduct for a long time, the IPM module When current overcurrent occurs, the overcurrent protection function of the IPM module will detect the overcurrent signal and turn off the internal IGBT; but when the current decreases to less than the protection value, the IPM module’s IGBT will be turned on again, and the IPM module will re-occur overcurrent , the overcurrent protection function of the IPM module will detect the overcurrent signal again and turn off the internal IGBT; in this way, the IPM module will eventually be damaged after multiple current overcurrent shocks
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[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
[0039] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0040] In describing the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front ", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the pres...
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The invention discloses an overcurrent protection circuit of an intelligent power module. The overcurrent protection circuit comprises a sampling resistor, a microprocessor and an overcurrent protection module with a latch function. One end of the sampling resistor is connected with the output end of a lower bridge arm and the input end of the overcurrent protection module. The other end of the sampling resistor is grounded. The protection signal and unlocking end of the overcurrent protection module is connected with the IO port of the microprocessor. The output end of the overcurrent protection module is connected with an overcurrent protection pin. According to the invention, the overcurrent protection circuit of the intelligent power module stimulates the intelligent power module to switch on an overcurrent protection function when the intelligent power module has overcurrent, and the overcurrent condition is locked by the overcurrent protection module until the microprocessor outputs an unlocking signal to enable the intelligent power module to restore to normal operation; the intelligent power module is prevented from being damaged by repeated overcurrent shock; and the circuit is simple, reliable and low-cost. In addition, the invention further discloses a control method and an air conditioner.
Description
technical field [0001] The invention relates to the technical field of protection circuits, in particular to an overcurrent protection circuit of an intelligent power module, a control method and an air conditioner. Background technique [0002] In the intelligent power module (IPM) application, the connection mode of the overcurrent protection circuit is usually: the output end of the lower bridge arm of the IPM module is connected to one end of a sampling resistor, and is connected to the overcurrent protection circuit of the IPM module at the same time. Protection pin, the other end of the sampling resistor is grounded. [0003] When the micro control unit (Microcontroller Unit, MCU) that controls the IPM module breaks down and makes the insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) of a certain bridge arm inside the IPM module conduct for a long time, the IPM module When current overcurrent occurs, the overcurrent protection function of the...
Claims
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IPC IPC(8): H02H7/122
CPCH02H7/1227
Inventor 梁汝锦
Owner WUHU MATY AIR CONDITIONING EQUIP CO LTD