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Control method for multi-branch PTC heater

A control method and heater technology, which are applied to electric heating devices, electrical components, etc., can solve problems such as fluctuations in the working current of the control system, impact of PTC heating devices, and impact on the service life of PTC heating devices.

Active Publication Date: 2020-06-16
无锡雷利电子控制技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicant found that in the temperature closed-loop control scheme, the output of the temperature difference after PI adjustment is directly used as the driving PWM duty cycle signal, which will cause a response hysteresis in the operating current of the PTC heating device, which will cause the work of the control system The large fluctuations and poor stability of the current have brought a great impact on the PTC heating device and related components of its control system, and ultimately have a negative impact on the service life of the PTC heating device

Method used

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  • Control method for multi-branch PTC heater
  • Control method for multi-branch PTC heater
  • Control method for multi-branch PTC heater

Examples

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Effect test

Embodiment 1

[0047] Example 1: see figure 1 and figure 2 As shown, a control method of a PTC heating device 20 adopts a drive controller 30 electrically connected between the DC bus power supply 10 and the PTC heating device 20 to realize the drive control of the PTC heating device 20; the drive controller The control method includes temperature outer closed-loop control and current inner closed-loop control; wherein, the output signal of the temperature outer closed-loop control is used as the target working current signal input by the current inner closed-loop control, and the output signal of the current inner closed-loop control is used as the PWM control for driving the PTC heating device 20. Air ratio signal; specifically, the temperature outer closed-loop control is based on the temperature difference between the preset target temperature signal and the actual sampling temperature signal, and then the target operating current signal is output after PI or PID adjustment; the current...

Embodiment 2

[0061] Example 2: see Figure 6 As shown, a control method for a multi-branch PTC heater 2, the multi-branch PTC heater 2 includes a number of parallel PCT heating devices 20, which are electrically connected between the DC bus power supply 1 and each PCT heating device 20 The driving controller is used to respectively realize the driving control to each PCT heating device 20; the driving controller includes an MCU main control module 31 and several driving circuits 32 for each PCT heating device 20 respectively, and the MCU main control module 31 provides to each PCT heating device 20 respectively. Each drive circuit 32 sends PWM duty cycle signals with equal frequencies, wherein the PWM duty cycle signals of at least two drive circuits 32 have a phase difference not equal to 0, which is used to improve the multi-branch PTC heater 2 in a single signal period. The average degree of internal input power; under the action of this technical idea, the current fluctuation range of ...

Embodiment 3

[0069] Embodiment 3: The remaining technical solutions of this embodiment 3 are the same as those of embodiment 2, the only difference being that the duty cycle ranges of the PWM duty cycle signals PTC1a, PTC2a, and PTC3a in this embodiment 3 are greater than 33.3% and less than 66.6% %; see further Figure 9 As shown, the PWM duty cycle signals PTC1a, PTC2a, PTC3a of each PCT heating device 20 in the present embodiment 3 and the working current waveform diagram of the PCT heater 2, it can be clearly seen that the working current of the present embodiment 3 has good stability Waveform, the input power of the multi-branch PTC heater 2 is evenly distributed in a single signal cycle.

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Abstract

The invention discloses a control method for a multi-branch PTC heater. The multi-branch PTC heater comprises a plurality of PCT heating devices which are connected in parallel, and employs a drive controller which is electrically connected between a DC bus power supply and each PCT heating device to achieve the drive control of each PCT heating device. The drive controller comprises an MCU main control module and a plurality of drive circuits applied to the PCT heating devices respectively. The MCU main control module sends PWM duty ratio signals with the same frequency to the drive circuitsrespectively. The PWM duty ratio signals of the at least two drive circuits have a phase difference which is not equal to 0, improving the average degree of input power of the multi-branch PTC heaterin a single signal period. According to the invention, impact on the PTC heater and related components in the working process of the multi-branch PTC heater can be reduced, and finally, the stability,safety and reliability of the multi-branch PTC heater are improved; and the service life of the multi-branch PTC heater in practical application is guaranteed.

Description

technical field [0001] The invention belongs to the control field of PTC heaters, and in particular relates to a control method for multi-branch PTC heaters. Background technique [0002] The characteristic of PTC (abbreviation of Positive Temperature Coefficient) usually means that its resistivity will increase as the temperature rises. Because of the existence of the PTC feature, people use the PTC feature to prepare a heating device with a temperature control function, which can also be called a PTC heating device. [0003] The existing control methods of PTC heating devices all adopt temperature closed-loop control, specifically, the temperature sensor is used to sample the temperature of the PTC element or its applied medium, and the target control temperature and the actual sampling temperature are PI adjusted, and the output signal is used as the PWM duty. The ratio signal drives the PTC to heat up until a new temperature balance is reached. However, the applicant f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B1/02
CPCH05B1/02
Inventor 王明仁娄明明
Owner 无锡雷利电子控制技术有限公司
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