Method for controlling a PTC heater and a PTC heater
DE102025106411B3Undetermined Publication Date: 2026-08-06MAHLE INT GMBH
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- MAHLE INT GMBH
- Filing Date
- 2025-02-20
- Publication Date
- 2026-08-06
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Abstract
The invention relates to a method (3) for controlling a PTC heater (1) to a required predetermined setpoint heating power (P_setpoint). A first duty cycle (DC1) is calculated based on the setpoint heating power (P_setpoint) and the current actual heating power (P_actual) of the PTC heater (1), and a maximum duty cycle (DC_max) is determined depending on a predetermined maximum resistance (R_max) of the PTC heater (1) and its current actual resistance (R_actual). The first duty cycle (DC1) and the maximum duty cycle (DC_max) are compared, and a setpoint duty cycle (DC_setpoint) is set equal to the lower value. Then, a control signal (PWM) with the setpoint duty cycle (DC_setpoint) is generated, and a voltage (U) modulated by the control signal (PWM) is applied to the PTC heater (1). The invention also relates to the PTC heater (1) with a control unit (2) for carrying out the method (3).
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Citation Information
Patent Citations
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