Apparatus and method for controlling AC ptc heater, AC device, and vehicle

Abstract

The invention discloses a device and method for controlling an AC PTC heater, an AC device and a vehicle, and the device for controlling the AC PTC heater. The device includes: a zero-crossing detection module, which is used for detecting the signal of the AC power supplying the AC PTC heater. Zero-crossing signal; drive module, the drive module includes a controllable switch for controlling the AC PTC heater; control module, the control module is connected with the zero-crossing detection module and the drive module, used to obtain the required heating power, according to the required heating power The target phase shift angle for driving the controllable switch is obtained, and in response to the zero-crossing signal, the conduction time of the controllable switch is controlled according to the target phase shift angle, so that the AC PTC heater outputs the required heating power. The device for controlling the AC PTC heater in the embodiment of the present invention can meet the thermal energy supply for low-temperature heating of the heat pump system by setting the AC PTC heater, and meet the heating demand. The technology is mature, the cost is low, and the application range is wide.

Description

technical field [0001] The present invention relates to the technical field of vehicles, and in particular, to a device and method for controlling an alternating current PTC (Positive Temperature Coefficient, positive temperature coefficient) heater, an alternating current device and a vehicle. Background technique [0002] The main power of an electric vehicle comes from the battery pack, and the power supply is mostly DC, and most of the electrical loads in the vehicle are DC loads. Among them, the high-voltage DC load generally includes a motor controller, a DC / DC (direct current / direct current, DC-to-DC) converter, an air conditioner PTC (Positive Temperature Coefficient, positive temperature coefficient) heater, and a vehicle power supply assembly. In the HVDC load, the air conditioner PTC heater can use AC and DC power supply. However, the working power of the DC PTC heater is affected by the total voltage of the battery pack. It is difficult to standardize and standar...

AI Technical Summary

Problems solved by technology

PTC heaters for air conditioners in high-voltage DC loads can use AC and DC power supplies. However, the working power of DC PTC heaters is affected by the total voltage of the battery pack. It is difficult to platformize and standardize PTC for different battery voltage platforms. At the same time, the production process of PTC cores is not enough. Mature, and the AC PTC power supply voltage is 220V mains, the power supply voltage is unified, and it is easy to realize the platformization and standardization of the PTC core. The AC PTC is widely used in household air conditioners, and the technology is relatively mature compared to the DC PTC core manufacturing process

In the thermal management system of the air conditioner, due to the high heat conversion efficiency of the heat pump and the low power consumption, the heat pump solution has increasingly become the mainstream management solution for the thermal management of the air conditioner. Auxiliary heating by the heater is expensive and has a small scope of application. If the DC PTC heater is cancelled, the normal heating capacity of the heat pump is likely to be insufficient to meet the temperature requirements of the passenger compartment.

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