Electric heater protection device and electric heater
An electric heater and protection device technology, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve problems such as hidden safety hazards, complex operating conditions, waste of battery energy, etc., and achieve the effect of safe use
Active Publication Date: 2013-12-25
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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An electric heater protection device is disclosed. At least one stage of filter circuit is arranged in a control circuit of the electric heater so as to control driving to a heating core of the electric heater. The filter circuit is arranged between a signal generating unit and a driving circuit of the electric heater. Pulse signals can pass through the filter circuit and arrive at the driving circuit of the electric heater and the heating core can be driven to heat only if a driving signal emitted by a signal generating unit is a column of pulse signals which are higher than a certain frequency or the pulse signals located in a certain frequency scope. Therefore, a phenomenon that the electric heater is driven to heat when a circuit board or the circuit generates an abnormal signal is avoided.
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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Login to View More IPC IPC(8): H03H11/12H03H11/06
Inventor 席卫东
Owner HANGZHOU SANHUA RES INST CO LTD