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Heating arrangment and method for controlling heating arrangement

A technology for heating devices and heaters, which is applied in the direction of electric heating devices, fluid heaters, heating element materials, etc., and can solve problems such as limitations

Inactive Publication Date: 2020-11-17
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because of this, small temperature increases, for example in the reheating mode of the heating unit, are difficult to achieve
[0004] However, since the maximum control frequency and thus the minimum adjustable output power are limited by the electrical and physical characteristics of the PTC heater, the improvement of the resolution on the control side also has its limitations

Method used

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Embodiment Construction

[0017] In order to avoid repetitions, express reference is here made to the above description of the heating device according to the invention.

[0018]In order to illustrate the idea of ​​the present invention, a numerical example is now given. It should be understood that said numerical values ​​and said ranges are illustrative only and not limiting. Consider a PTC heater with a maximum output power of eg 10 kW, which can be controlled step-by-step by means of an HF modulation signal with several modulation stages. For example, the time frame of the HF modulation signal can amount to 1 second and the HF frequency of the HF modulation signal can be 100 Hz. Through the HF modulation signal, the output power of the PTC heater can be adjusted between the minimum output power and the maximum output power, for example, there are 100 levels in total, and the minimum adjustable output power is equal to 1% of the maximum output power or 100 watts. The LF modulated signal has, for e...

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PUM

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Abstract

The present disclosure describes to a heating arrangement for an electric vehicle and a method for controlling such a heating arrangement. The heating arrangement includes at least one PTC heater anda control device for controlling the at least one PTC heater. The control device includes an HF pulse width modulator that generates an HF modulation signal in multiple modulation steps. The respective modulation step of the HF pulse width modulator corresponds to an output step of the at least one PTC heater, so that the control device, via the HF pulse width modulator, adjusts the output of theat least one PTC heater between a minimum output and a maximum output, step-by-step, in the plural output steps. The invention also relates to a method for controlling the heating device.

Description

technical field [0001] The invention relates to a heating device for an electric vehicle according to the preamble of claim 1 , which has at least one PTC heater. The invention also relates to a method for controlling a heating device. Background technique [0002] For the air conditioning of electric vehicles, a heating device with a PTC heater (PTC: Positive Temperature Coefficient) is used. Since there are no more heat sources on electric vehicles, the maximum output of such PTC heaters often exceeds 5 kW. PTC heaters are mostly controlled by electronic components, which are usually attached directly to the PTC heater. The controller is usually a PWM controller (PWM: Pulse Width Modulation), which adjusts the voltage applied to the PTC heater by modulating a signal, thereby adjusting the output power of the PTC heater. Due to the electrical and physical characteristics of the PTC heater, its maximum achievable control frequency—that is, the frequency of the modulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/02H05B3/12H05B1/02
CPCH05B1/0202H05B1/0236H05B3/02H05B3/12B60H1/2218F24H9/1872B60H1/2225B60H2001/2231
Inventor 马蒂亚斯·沙尔
Owner MAHLE INT GMBH
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