An electric heater protection device and an electric heater
A technology for electric heaters and protection devices, applied in the direction of frequency selection two-terminal pair network, multi-terminal pair network, etc., can solve problems such as potential safety hazards, abnormal heating core drive signals, secondary disasters, etc., and achieve the effect of safe use
Active Publication Date: 2018-07-31
HANGZHOU SANHUA RES INST CO LTD
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Problems solved by technology
Because the car generally has a large vibration or vibration during driving, and the specific operating conditions are relatively complicated, this sometimes causes abnormalities in the driving signal of the heating core. In addition, in some special cases, such as the main control The single-chip microcomputer crashes or the control circuit board itself is damaged, causing the control terminal of the heating core to be placed in a random high-level or low-level state, and if this level state is exactly the level state required by the PTC drive, As a result, if the heating core is continuously turned on and heated, the PTC will continue to be connected, causing a secondary disaster, which has a greater safety hazard. In addition, heating without heating will also cause energy waste of the battery.
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[0034] Introduce the second kind of implementation mode of the present invention below, as figure 2 as shown, figure 2 It is a schematic diagram of the circuit connection of the heating core of the electric heater in the second embodiment of the present invention. In this embodiment, the protection circuit adopts a band-pass filter circuit, where the band-pass filter circuit is such as figure 2 As shown by the dotted line in the middle, in this embodiment, a band-pass filter circuit is provided as a protection circuit between the main control microcontroller MCU and the driving port of the heating core of the electric heater PTC, and the heating core of the electric heater PTC There is a drive circuit before the drive port; the band-pass filter circuit is as figure 2 As shown by the middle dotted line, the bandpass filter circuit includes capacitor C11, resistor R12, resistor R11, capacitor C12, rectifier diode D11, resistor R13, capacitor C13, resistor R14, and NPN tran...
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A protection device for an electric heater, at least one level of filter circuit is set in the control circuit of the electric heater to control the driving of the heating core of the electric heater, the filter circuit is set between the signal generating unit and the electric Between the driving circuits of the heater; only when the driving signal sent by the signal generating unit is a series of pulse signals higher than a certain frequency or within a certain frequency range, the pulse signal can pass through the filter circuit and reach the electric heater The heating core can only be driven and heated by the driving circuit, which avoids the phenomenon that the electric heater may be driven to heat when an abnormal signal occurs on the circuit board or circuit.
Description
technical field [0001] The invention relates to the technical field of electric heater control, in particular to a protection and control device for an electric heater on an electric vehicle or a hybrid vehicle, which prevents the electric heater from being driven by an abnormal level signal. Background technique [0002] In current electric vehicles or hybrid vehicles, it is necessary to use an electric heater as a heat source for heating or to provide heat preservation measures for the battery. The electric heater is generally composed of multiple sets of electric heating cores. At present, for the control of this kind of heating core, a simple high and low level signal control method is generally adopted, that is, using high level or low level as a signal to control whether the heating core is working. In the current heating core driving scheme, the "driving signal" is generally a high or low level signal to control whether the heating core is working or not. Because the...
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IPC IPC(8): H03H11/12H03H11/06
Inventor 席卫东
Owner HANGZHOU SANHUA RES INST CO LTD