PTC electric heating control device, method, air conditioner, medium and computer equipment

Abstract

The invention belongs to the technical field of PTC electric heating control, and discloses a PTC electric heating control device, method, air conditioner, medium and computer equipment. The PTC electric heating control device includes: an electromagnetic relay, an excitation coil, an electromagnetic relay contact, and an electric heating assembly , power resistors and peripheral control chips. The present invention reduces the impact of the PTC start-up impulse current on the relay contacts, improves the reliability of the service life of the relay, reduces the probability of relay adhesion, and improves the user's comfort during use; uses different time periods to control the access and connection of series resistors The time of disconnection and connection is designed so that the PTC is in a low-resistance state at the moment of power-on, reducing the instantaneous current of the heating element PTC; the moment of disconnection is to disconnect after the resistance of the heating element is stable, so as to ensure the stability of the PTC output and solve the problem of PTC startup current. Too large will affect the reliability of the contact connection and disconnection of the relay, and improve the reliability of the power supply circuit of the PTC heating element.

Description

technical field [0001] The invention belongs to the technical field of PTC electric heating control, and in particular relates to a PTC electric heating control device, method, air conditioner, medium and computer equipment. Background technique [0002] At present, in order to meet the heating capacity requirements of air conditioners, most air conditioners on the market currently use additional electric heating as an auxiliary heat source, especially PTC electric heating. PTC is turned on and off through the relay signal. Due to the characteristics of PTC, a large inrush current will be generated at the moment of starting, far exceeding the operating current during normal operation. Air-conditioning electric heating devices in the industry generally use two electromagnetic relays with the same rated current value and greater than the inrush current value for synchronous control. The relay with a higher rated current value is more expensive, resulting in an increase in the ...

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Problems solved by technology

[0008] (1) Air-conditioning electric heating devices in the industry generally use two electromagnetic relays with the same rated current value and greater than the inrush current value for synchronous control. The relay with a higher rated current has a higher cost, resulting in an increase in the production cost of the enterprise

[0009] (2) The existing method of using the IGBT driver chip to keep the voltage duty cycle at a low level during start-up, so that the electric heating can be started at a low voltage, uses IGBT signal control, the cost is high, and the circuit change is more complicated and cumbersome

[0010] (3) The existing method of delaying the pull-in of the electromagnetic relay is used to deal with the influence of the large current of the PTC electric heating on the contact of the small relay when the relay is pulled in, and the purpose of reducing the inrush current cannot be achieved.

[0011] (4) The existing method of controlling the starting sequence of multiple PTC electric heating components with time delay through multiple electromagnetic relays, and starting the electric heating in batches is only applicable to multiple electric heating components, and the current electric heating used in household air conditioners is For a complete component, there is no test requirement for starting electric heating in batches, so this control method cannot be used to achieve protection against large inrush currents

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