CN103475331A - Electric heater protection device and electric heater - Google Patents
Electric heater protection device and electric heater Download PDFInfo
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- CN103475331A CN103475331A CN2012101872145A CN201210187214A CN103475331A CN 103475331 A CN103475331 A CN 103475331A CN 2012101872145 A CN2012101872145 A CN 2012101872145A CN 201210187214 A CN201210187214 A CN 201210187214A CN 103475331 A CN103475331 A CN 103475331A
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Abstract
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 the 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 drive the heating core to heat through the filter circuit 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. The filter circuit also comprises an operational amplifier. Therefore, a phenomenon that the electric heater is driven to heat when a circuit board or the circuit generates an abnormal signal is avoided and the signals of the signal generating unit can be guaranteed to be accurately transmitted to a driving terminal or a common terminal of the electric heater so that the electric heater is accurately driven.
Description
Technical field
The present invention relates to electric heater control technology field, particularly the protection control device of the electric heater on a kind of electric automobile or hybrid vehicle, avoid electric heater to be driven by abnormal level signal.
Background technology
In the automobile of current electric automobile or hybrid power, need to warm oneself as thermal source or provide Insulation to battery with electric heater, electric heater generally has many group electric heating cores to combine.For the control of this type of heating core, generally adopt simple low and high level control mode signal at present, utilize high level or low level as signal, control heating core and whether work.In current heating core drive scheme, " driving signal " is generally the low and high level signal, carries out heating core work whether control.Because automobile generally has larger vibrations or shake in the process of moving, add concrete applying working condition relative complex, cause so sometimes abnormal to the driving signal of heating core, in addition at some in particular cases, as main control singlechip crashes or control circuit board itself is damaged, cause controlling the control terminal of heating core, be placed in random high level or low level state, if and this level state is just in time PTC while driving needed level state, thereby cause the lasting unlatching heating of heating core, PTC will continue to connect, cause secondary disaster, there is so larger potential safety hazard, in addition in the situation that do not need the heating heating also can cause the energy waste of battery.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of protective device for electric heater, while making driving signal to electric heater be general high level or low level, can not drive the heater starting heating, and only have the enable port that arrives electric heater or drive port, be that frequency is when the pulse signal of particular range, electric heater just can be driven, thereby avoided the driving in the system exception situation, with the energy waste of having avoided electric heater to be driven without driving the time; In addition due in electric automobile or hybrid vehicle, signal generating unit is as relatively low as the control signal voltage sent of master control circuit plate, signal when the filter circuit relatively a little less than, for guaranteeing accurately to drive electric heater, the present invention by the following technical solutions:
A kind of electric heater protective device, be provided with at least filter circuit of one-level in the control circuit of described electric heater, control the driving to the heating core of described electric heater, described filter circuit is arranged between the drive circuit of described signal generating unit and described electric heater; The driving signal that only has signal generating unit to send is that row are higher than the pulse signal of certain frequency or while being positioned at the pulse signal of certain frequency scope, pulse signal is by described filter circuit, and arriving the drive circuit of described electric heater, heating core could driven heating; Also comprise operational amplifier in described filter circuit.
Described filter circuit only comprises the high pass filter that allows the signal higher than certain frequency to pass through, described filter circuit also comprises the operational amplification circuit of operational amplifier, rectifier cell, switching component, and described filter circuit comprises following job step:
(10) filtering: will filter out lower than the signal that frequency is set, and only higher than the signal that frequency is set, can pass through high pass filter;
(20) will pass through operational amplification circuit by the signal after filtering;
(30) change AC signal into direct current signal;
(40) make direct current signal realize switch control by switching component;
(50) drive circuit to described electric heater by the signal after switching component, the switch of control drive circuit, realize the switch drive of electric heater is controlled.
Described filter circuit is high-pass filtering circuit, and described filter circuit is one-level filtering; Described filter circuit comprises high pass filter, rectifier diode D41, capacitor C 43 and resistance R 44, switching component, operational amplification circuit, and operational amplification circuit comprises operational amplifier, feedback resistance Rf, resistance R 41; Signal generating unit first, by high pass filter, passes through high pass filter higher than the AC signal of certain frequency after sending and driving signal; Then AC signal, by operational amplification circuit, again by rectifier diode D41, becomes direct current signal, and then, by capacitor C 43 and resistance R 44, becomes the comparatively stable direct current signal of voltage; Comparatively stable direct current signal is used for the switch of control switch components and parts, thereby realizes the switch of the drive circuit of described electric heater is controlled.The driving signal that can pass through is so just controlled as the signal in original fixed frequency scope of setting, if and just can not pass through filter circuit higher or lower than the signal of setpoint frequency scope, even the circuit board abnormal occurs that some drive signal, generally also can not drive electric heater work by filter circuit.
Described high pass filter comprises resistance R 42 and capacitor C 41, and capacitor C 41 is connected with the driving signal output part of signal generating unit; The switching component of described filter circuit is triode Q41; The capacitor C 43 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 44, the other end is connected with negative electrode, the resistance R 43 of rectifier diode D41, an end of the output of the anodic bonding operational amplifier of rectifier diode D41, feedback, resistance R _ f; The other end of capacitor C 41 is connected to the positive input of operational amplifier, and the reverse input end of operational amplifier is by resistance R 41 ground connection; The other end of resistance R 43 is connected to the base stage of triode Q41, the grounded emitter of triode Q41, and the collector electrode of triode Q41 is connected to the switching component of drive circuit;
Perhaps, described triode Q41 can be substituted by field effect transistor or Darlington transistor.
Described filter circuit can also be bandwidth-limited circuit, described filter circuit is one-level filtering, described filter circuit comprises high pass filter, rectifier diode D41, capacitor C 43 and resistance R 44, switching component, operational amplification circuit, and operational amplification circuit comprises operational amplifier, feedback resistance Rf, resistance R 41; Described filter circuit only also comprises the low pass filter that allows the signal lower than certain frequency to pass through; After signal generating unit sends and drives signal, first by high pass filter, higher than the AC signal of certain frequency by high pass filter and then pass through low pass filter; After perhaps signal generating unit sends and drives signal, first by low pass filter, lower than the AC signal of certain frequency by low pass filter and then pass through high pass filter;
AC signal by high pass and low pass filter after again by operational amplification circuit, again by rectifier diode D41, become direct current signal, and then, by capacitor C 43 and resistance R 44, become the comparatively stable direct current signal of voltage; Comparatively stable direct current signal is used for the switch of control switch components and parts, thereby realizes the switch of the drive circuit of described electric heater is controlled.
Described high pass filter comprises resistance R 32 and capacitor C 31, and described low pass filter comprises resistance R 35 and capacitor C 34; The switching component of described filter circuit is triode Q31; The capacitor C 33 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 34, the other end is connected with negative electrode, the resistance R 33 of rectifier diode D31, the output of the anodic bonding operational amplifier of rectifier diode D31, the end of feedback resistance Rf; The positive input of operational amplifier connects the output of high pass filter or low pass filter, and the input of high pass filter or low pass filter connects the signal output part of signal generating unit, and the reverse input end of operational amplifier is by resistance R 31 ground connection; The other end of resistance 343 is connected to the base stage of triode Q41, the grounded emitter of triode Q31, and the collector electrode of triode Q31 is connected to the switching component of drive circuit;
Perhaps, described triode Q31 is substituted by field effect transistor or Darlington transistor.
The present invention also provides a kind of electric heater, comprises and sends signal output unit, the drive circuit that drives signal, and also comprise in addition the described electric heater protective device of the claims, the filter circuit of described electric heater protective device is active filter circuit.
Described filter circuit is connected to the drive end of described electric heater, described filter circuit carries out the filtering processing for one group of heating core of described electric heater, and the output of the switching component of described filter circuit is connected to the switching component of the drive circuit of the heating core that described electric heater is corresponding.
Described filter circuit can also be connected to the common port of described electric heater, described filter circuit is for two groups of described electric heater or organize heating core more and carry out the filtering processing, and the output of the switching component of described filter circuit is connected to the switching component of drive circuit of the heating core of described electric heater; Described filter circuit is for two groups of described electric heater or organize heating core more and carry out the filtering processing.Circuit is relatively simple like this, and low cost of manufacture, connects also relatively simple.
Described signal generating unit can be main control unit MCU, the switching component of the drive circuit of the heating core of described electric heater also is electrically connected to the output of described main control unit, particularly, as by as described in the output of base stage and main control unit of switching component of drive circuit of heating core of electric heater by being electrically connected to.
Compared with prior art, the present invention has the following advantages: because the driving signal of electric heater first passes through filter circuit, can avoid like this electric automobile or hybrid vehicle sometimes due to the driving signal jolted, circuit signal causes extremely, use safer, energy-conservation, be provided with again operational amplification circuit simultaneously in filter circuit, make the signal of signal generating unit can be sent to like clockwork drive end or the common port of electric heater, electric heater is accurately driven.
The accompanying drawing explanation
Fig. 1 is the connection diagram of the first embodiment circuit of the present invention;
Fig. 2 is the connection diagram of the second embodiment circuit of the present invention;
Fig. 3 is the connection diagram of the third embodiment circuit of the present invention;
Fig. 4 is the connection diagram of the 4th kind of embodiment circuit of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be appreciated that embodiment described herein is only used for explaining the present invention, and be not intended to limit the present invention.
Fig. 1 is the connection diagram of the first embodiment of the present invention to the relevant part of protective circuit of the driving of the heating core of electric heater, in present embodiment, signal generating unit is main control singlechip MCU, be provided with the one-level high-pass filtering circuit as protective circuit in present embodiment the drive end of the heating core 2 from main control singlechip MCU to electric heater PTC, high-pass filtering circuit adopts active power filtering; Be provided with drive circuit before the driving port of the heating core 2 of electric heater PTC; Drive circuit comprises resistance R 5, resistance R 7, triode Q2, rectifier diode D2, resistance R 6, relay K 1.Wherein high-pass filtering circuit is as shown in dotted line frame part in Fig. 1, comprise capacitor C 41, resistance R 42, resistance R 41, rectifier diode D41, resistance R 43, capacitor C 43, resistance R 44, NPN triode Q41, operational amplifier U1A, feedback resistance Rf, wherein capacitor C 43 is arranged in parallel a rear end ground connection with resistance R 44, the other end is connected with negative electrode, the resistance R 43 of rectifier diode D41, output, the feedback resistance Rf of the anodic bonding operational amplifier U1A of rectifier diode D41; The other end ground connection of feedback resistance Rf; The reverse input end of operational amplifier U1A is by resistance R 41 ground connection, the positive input contact resistance R42 of operational amplifier U1A, capacitor C 41; Capacitor C 41 other ends are connected to the signal output port of main control singlechip MCU, and the other end ground connection of resistance R 42; The other end of resistance R 43 is connected to the base stage of NPN triode Q41, the grounded emitter of NPN triode Q41, the collector electrode of NPN triode Q41 is connected to power supply VCC port by resistance R 5 and is connected to the base stage of the triode Q2 of drive circuit by the resistance R 7 of drive circuit; The emitter of the triode Q2 of drive circuit is connected to power supply VCC port, and the collector electrode of triode Q2 is connected to relay K 1 and passes through rectifier diode D2 and resistance R 6 ground connection; The switch of relay K 1 is controlled the heating core 2 of PTC electric heater.
This high-pass filtering circuit only allows the high pass filter formed by R42 and C41 higher than the signal of a certain frequency, the appearance value of the decay of the frequency of signal and capacitor C 41 and the resistance of resistance R 42 are relevant, wherein as the main control singlechip MCU of signal generating unit or the square-wave signal of other programmable, intelligent chips generation, by the high pass filter of R42 and C41, higher than the AC signal of certain frequency, pass through high pass filter; The operational amplification circuit that above AC signal forms by operational amplifier U1A, feedback resistance Rf, resistance R 41; And then, by rectifier diode D41, become direct current signal, and, by C43 and R44, become the comparatively stable direct current signal of voltage; The direct current signal that above voltage is comparatively stable, be used for controlling the switch of triode Q41, thereby realize the control to triode Q2, thus control relay K1; The final switch control realized one group of heating core 2 of PTC.
High-pass filtering circuit described above, just in order to describe the problem, be illustrated, components and parts wherein also can be comprised of other circuit elements devices, as above-mentioned triode Q1 can be also other switch amplifying circuits or the circuit elements device of realizing said function, as field effect metal-oxide-semiconductor, Darlington transistor etc.; As the high pass filter be comprised of R42 and C41 also can be by the high pass filter that resistance and inductance were formed; Rectifier diode D41 can substitute etc. with rectifier bridge.
The high-pass filtering circuit that drive end of the present invention adopts present embodiment as protective circuit after, what signal generating unit sent must be the pulse signal higher than certain frequency, drives signal just can arrive the driving port, this group heating core of PTC just can be switched on; And in the ordinary course of things, unless main control singlechip MCU is controlled, drive port can automatically not produce qualified pulse signal.Therefore, PTC can not led to by misconnection, in addition in present embodiment by operational amplifier is set, also can avoid because driving signal signal after high-pass filtering circuit problem less than normal, operational amplifier can well isolate the filter circuit of prime and subsequent conditioning circuit get up in addition, avoids interference between the two; And by regulating the resistance of R41 and Rf, the gain of conditioning signal filtering easily, the orderly driven of assurance signal.
Below introduce the second execution mode of the present invention, as shown in Figure 2, Fig. 2 is the connection diagram of the second embodiment of the present invention to the circuit of the heating core of electric heater.In this execution mode, what protective circuit adopted is active bandwidth-limited circuit, wherein bandwidth-limited circuit is as shown in dotted line part in Fig. 2, present embodiment is to be provided with bandwidth-limited circuit as protective circuit the driving port of the heating core from main control singlechip MCU to electric heater PTC, and is provided with drive circuit before the driving port of the heating core of electric heater PTC; Bandwidth-limited circuit comprises the high pass filter that capacitor C 31, resistance R 32 form, the low pass filter that capacitor C 34, resistance R 35 form, bandwidth-limited circuit also comprises resistance R 31, rectifier diode D31, resistance R 33, capacitor C 33, resistance R 34, NPN triode Q31, operational amplifier U1A, feedback resistance Rf.
Wherein capacitor C 33 is arranged in parallel a rear end ground connection with resistance R 34, the other end is connected with negative electrode, the resistance R 33 of rectifier diode D31; The anodic bonding feedback resistance Rf of rectifier diode D31, the output of operational amplifier U1A, the reverse input end of operational amplifier U1A is by resistance R 31 ground connection, the other end ground connection of feedback resistance Rf, the positive input of operational amplifier U1A connects capacitor C 34, resistance R 35, the other end ground connection of capacitor C 34; The other end of resistance R 35 is connected to capacitor C 31, also passes through resistance R 32 ground connection, and the other end of capacitor C 31 is connected to the signal output port of main control singlechip MCU; The other end of resistance R 33 is connected to the base stage of NPN triode Q31, the grounded emitter of NPN triode Q31, the collector electrode of NPN triode Q31 is connected to power supply VCC port by resistance R 5 and is connected to the base stage of the triode Q2 of drive circuit by the resistance R 7 of drive circuit; The emitter of the triode Q2 of drive circuit is connected to power supply VCC port, and the collector electrode of the triode Q2 of drive circuit is connected to relay K 1.
The band pass filter network that this bandwidth-limited circuit only allows the signal of certain limit frequency band to form by R32 and C31, R35 and C34, the decay of signal frequency is relevant with C34 to R32 and C31, R35, the minimum of the frequency range that permission is passed through is relevant to the appearance value of the resistance of R32 and C31, the resistance of the peak of the frequency range that permission is passed through and resistance R 35 is relevant with the appearance value of capacitor C 34, and with the first execution mode, comparing is to have increased the low pass filter that a resistance R 35 and capacitor C 34 form.The square-wave signal that main control singlechip MCU or other programmable, intelligent chips produce, the band pass filter network formed by above-mentioned resistance R 32 and capacitor C 31, resistance R 35 and capacitor C 34, what signal generating unit sent must be the pulse signal in the certain frequency scope, drive signal just can lead to filter rete cutaneum network by band and arrive the driving port, this group heating core of PTC just can be switched on; Above AC signal, the operational amplification circuit formed by operational amplifier U1A, feedback resistance Rf, resistance R 31, and then, by rectifier diode D31, become direct current signal, and, by C33 and R34, become the comparatively stable direct current signal of voltage; Below comparatively stable direct current signal, be used for controlling the switch of triode Q31, thereby realize the control to triode Q2, thus control relay K1; The final switch control realized the heating core 2 of PTC electric heater.After adopting this bandwidth-limited circuit as protective circuit, the signal of driving port that leads to the heating core of PTC must be the pulse signal in a certain frequency range, and the heating core of PTC just can be connected by electricity; And in the ordinary course of things, unless main control singlechip MCU is controlled, drive port can not receive qualified pulse signal, therefore, PTC can not led to by misconnection.The high pass filter that R32, C31 form in addition can be regulated with the order of the low pass filter be comprised of R35, C34, and the low pass filter soon be comprised of R35, C34 is arranged near signal generating unit, can form bandwidth-limited circuit too.
In the execution mode of introducing in the above, each drive end of PTC needs circuit kit to process, if when PTC is many gears type; may reach 2,3 drive ends; will need the protective circuit of respective numbers, thereby cause the circuit complexity, volume increase and cost are relatively high.Therefore can adopt execution mode as shown in Figure 3, Figure 4, Fig. 3 is the connection diagram of the third embodiment of the present invention to the relevant part of the circuit of electric heater, and Fig. 4 is the connection diagram of the 4th kind of embodiment circuit of the present invention.Wherein the 3rd execution mode is a kind of improvement to above-mentioned the first execution mode, its main distinction point is that the high-pass filtering circuit in present embodiment is that the common port that is connected to the PTC electric heater (or claims Enable Pin, the COM end), and be connected to each heating core of electric heater PTC by the drive circuit of each heating core, rather than as being connected to the drive end of PTC electric heater in execution mode one, be used for controlling the switch of triode Q41 in present embodiment by the high pass protective circuit, that the output of NPN triode Q41 connects is triode Q61, relay K 1, triode Q62, the common port (COM end) of the PTC drive circuit that relay K 11 forms, as long as control the switch of NPN triode Q41, just can control the switch of above-mentioned triode Q61, relay K 1 and triode Q62, relay K 11 like this, NPN triode Q41 has realized enable (ENABLE) of above-mentioned drive circuit.Particularly, drive circuit comprise to the first heating core 2 of PTC electric heater provide driving drive circuit one, the drive circuit two of driving is provided to the second heating core 3, drive circuit one comprises resistance R 81, resistance R 83, triode Q61, rectifier diode D71, relay K 1, and drive circuit two comprises resistance R 84, resistance R 82, triode Q62, rectifier diode D72, relay K 11.The collector electrode of NPN triode Q41 is connected to power supply VCC end by resistance R 45, and is connected to the emitter of triode Q62 of emitter, the drive circuit two of the triode Q61 of drive circuit one; The base stage of the triode Q61 of drive circuit one is connected to main control singlechip MCU by resistance R 81, the collector electrode of triode Q61 is connected to relay K 1 and is connected to the anode of rectifier diode D71, and the negative electrode of the other end of relay K 1, rectifier diode D71 is connected to power supply VCC end by resistance R 83; The base stage of the triode Q62 of drive circuit two is connected respectively to main control singlechip MCU, the base stage of the triode Q61 of drive circuit one is connected to main control singlechip MCU by resistance R 84, the collector electrode of triode Q61 is connected to relay K 11 and is connected to the anode of rectifier diode D72, and the negative electrode of the other end of relay K 11, rectifier diode D72 is connected to power supply VCC end by resistance R 82.
Like this, as the high-pass filtering circuit of protective circuit as long as one group just can be realized the control to whole PTC electric heater, and need not for every group of heating core of PTC electric heater, high-pass filtering circuit be set separately again, other connections of this execution mode and control mode can, with reference to above-mentioned the first execution mode, be not described in detail here; Understand the protection control of one group of high-pass filtering circuit to two groups of heating cores of electric heater although only introduce in present embodiment in addition, so just for convenience, heating core can be three groups or more, and it connects with control mode is similar.
Equally, the 4th execution mode shown in Fig. 4, its bandwidth-limited circuit is common port (the COM end that is connected to the PTC electric heater, or title Enable Pin), rather than as being connected to the drive end of PTC electric heater in execution mode two, particularly, that the collector electrode of Q31 connects is Q61, K1, the common port (COM end) of the PTC drive circuit that Q62, K11 form; As long as control the switch of Q31, just can control the switch of above-mentioned Q61, K1 and Q62, K11 like this, Q31 has realized enable (ENABLE) of above-mentioned drive circuit.Therefore, equally also needing only one group of bandwidth-limited circuit just can be controlled many groups heating core of whole PTC electric heater.The connection that present embodiment is concrete can, with reference to the second and the 3rd execution mode, just be introduced here no longer in detail.
What the present invention related generally in addition is the protection to the type of drive of PTC electric heater, so the drawings and the specific embodiments also just show and described part related to the present invention in detail.In addition, the electric elements that adopt are not limited to described above, also can adopt other electric elements, as NPN triode Q31, Q41, can be also other switch amplifying circuits or the circuit elements device of realizing said function, as the field effect metal-oxide-semiconductor, Darlington transistor, rectifier diode can substitute with rectifier bridge etc.And the filter network that the filter network be comprised of resistance and electric capacity as described above also can be comprised of other components and parts, as the filter network formed by inductance and resistance.The heating core of PTC electric heater can be two groups, three groups or more groups, and the principle of its connection and working method are identical.。And can separately control for every group of heating core of electric heater, also can centralized and unifiedly control.In addition, in execution mode described above, filter circuit is the one-level filtering mode, also can, according to the needs of concrete system, be designed to secondary or above multiple-stage filtering mode in addition.High pass or bandwidth-limited circuit in execution mode in addition can be separately set on the wiring board of controller, in addition, can also be directly arrange and solidify on control chip, as long as its function reaches high-pass filtering recited above or bandpass filtering just can be realized purpose of the present invention equally.
The present invention by arranging operational amplifier U1A in filter circuit, make the filtering part and well isolation of subsequent conditioning circuit of prime, and by regulating the resistance of R22 and Rf, the gain of conditioning signal filtering easily, the too little problem of signal signal after filter that can effectively avoid signal generating unit to send like this.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention,, all still belong in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (10)
1. an electric heater protective device, be provided with at least filter circuit of one-level in the control circuit of described electric heater, control the driving to the heating core of described electric heater, described filter circuit is arranged between the drive circuit of signal generating unit and described electric heater; The driving signal that only has signal generating unit to send is that row are higher than the pulse signal of certain frequency or while being positioned at the pulse signal of certain frequency scope, pulse signal is by described filter circuit, and arriving the drive circuit of described electric heater, heating core could driven heating; Also comprise operational amplifier in described filter circuit.
2. electric heater protective device according to claim 1; it is characterized in that; described filter circuit only comprises the high pass filter that allows the signal higher than certain frequency to pass through; described filter circuit also comprises the operational amplification circuit of operational amplifier, rectifier cell, switching component, and described filter circuit comprises following job step:
(10) filtering: will filter out lower than the signal that frequency is set, and only higher than the signal that frequency is set, can pass through high pass filter;
(20) will pass through operational amplification circuit by the signal after filtering;
(30) change AC signal into direct current signal;
(40) make direct current signal realize switch control by switching component;
(50) drive circuit to described electric heater by the signal after switching component, the switch of control drive circuit, realize the switch drive of electric heater is controlled.
3. electric heater protective device according to claim 1 and 2, is characterized in that described filter circuit is high-pass filtering circuit, and described filter circuit is one-level filtering; Described filter circuit comprises high pass filter, rectifier diode D41, capacitor C 43 and resistance R 44, switching component, operational amplification circuit, and operational amplification circuit comprises operational amplifier, feedback resistance Rf, resistance R 41; Signal generating unit first, by high pass filter, passes through high pass filter higher than the AC signal of certain frequency after sending and driving signal; Then AC signal, by operational amplification circuit, again by rectifier diode D41, becomes direct current signal, and then, by capacitor C 43 and resistance R 44, becomes the comparatively stable direct current signal of voltage; Comparatively stable direct current signal is used for the switch of control switch components and parts, thereby realizes the switch of the drive circuit of described electric heater is controlled.
4. electric heater protective device according to claim 3, is characterized in that, described high pass filter comprises resistance R 42 and capacitor C 41, and capacitor C 41 is connected with the driving signal output part of signal generating unit; The switching component of described filter circuit is triode Q41; The capacitor C 43 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 44, the other end is connected with negative electrode, the resistance R 43 of rectifier diode D41, an end of the output of the anodic bonding operational amplifier of rectifier diode D41, feedback, resistance R _ f; The other end of capacitor C 41 is connected to the positive input of operational amplifier, and the reverse input end of operational amplifier is by resistance R 41 ground connection; The other end of resistance R 43 is connected to the base stage of triode Q41, the grounded emitter of triode Q41, and the collector electrode of triode Q41 is connected to the switching component of drive circuit;
Perhaps, described triode Q41 is substituted by field effect transistor or Darlington transistor.
5. electric heater protective device according to claim 1 and 2, it is characterized in that, described filter circuit is bandwidth-limited circuit, described filter circuit is one-level filtering, described filter circuit comprises high pass filter, rectifier diode D41, capacitor C 43 and resistance R 44, switching component, operational amplification circuit, and operational amplification circuit comprises operational amplifier, feedback resistance Rf, resistance R 41; Described filter circuit only also comprises the low pass filter that allows the signal lower than certain frequency to pass through; After signal generating unit sends and drives signal, first by high pass filter, higher than the AC signal of certain frequency by high pass filter and then pass through low pass filter; After perhaps signal generating unit sends and drives signal, first by low pass filter, lower than the AC signal of certain frequency by low pass filter and then pass through high pass filter;
AC signal by high pass and low pass filter after again by operational amplification circuit, again by rectifier diode D41, become direct current signal, and then, by capacitor C 43 and resistance R 44, become the comparatively stable direct current signal of voltage; Comparatively stable direct current signal is used for the switch of control switch components and parts, thereby realizes the switch of the drive circuit of described electric heater is controlled.
6. electric heater protective device according to claim 5, is characterized in that, described high pass filter comprises resistance R 32 and capacitor C 31, and described low pass filter comprises resistance R 35 and capacitor C 34; The switching component of described filter circuit is triode Q31; The capacitor C 33 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 34, the other end is connected with negative electrode, the resistance R 33 of rectifier diode D31, the output of the anodic bonding operational amplifier of rectifier diode D31, the end of feedback resistance Rf; The positive input of operational amplifier connects the output of high pass filter or low pass filter, and the input of high pass filter or low pass filter connects the signal output part of signal generating unit, and the reverse input end of operational amplifier is by resistance R 31 ground connection; The other end of resistance 343 is connected to the base stage of triode Q41, the grounded emitter of triode Q31, and the collector electrode of triode Q31 is connected to the switching component of drive circuit;
Perhaps, described triode Q31 is substituted by field effect transistor or Darlington transistor.
7. an electric heater, comprise and send signal output unit, the drive circuit that drives signal, also comprises in addition arbitrary described electric heater protective device wherein as claim 1-6, and the filter circuit of described electric heater protective device is active filter circuit.
8. electric heater according to claim 8, it is characterized in that, described filter circuit is connected to the drive end of described electric heater, described filter circuit carries out the filtering processing for one group of heating core of described electric heater, and the output of the switching component of described filter circuit is connected to the switching component of the drive circuit of the heating core that described electric heater is corresponding.
9. electric heater according to claim 8, it is characterized in that, described filter circuit is connected to the common port of described electric heater, described filter circuit is for two groups of described electric heater or organize heating core more and carry out the filtering processing, and the output of the switching component of described filter circuit is connected to the switching component of drive circuit of the heating core of described electric heater.
10. electric heater protective device according to claim 9, is characterized in that, described signal generating unit is main control unit MCU, and the switching component of the drive circuit of the heating core of described electric heater also is electrically connected to the output of described main control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210187214.5A CN103475331B (en) | 2012-06-08 | 2012-06-08 | A kind of electric heater protective device and electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210187214.5A CN103475331B (en) | 2012-06-08 | 2012-06-08 | A kind of electric heater protective device and electric heater |
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| Publication Number | Publication Date |
|---|---|
| CN103475331A true CN103475331A (en) | 2013-12-25 |
| CN103475331B CN103475331B (en) | 2018-07-31 |
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| CN201210187214.5A Active CN103475331B (en) | 2012-06-08 | 2012-06-08 | A kind of electric heater protective device and electric heater |
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| CN104967322A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Logic protection emitter coupling-type three-filtering nonlinear negative feedback switching voltage-stabilizing power supply |
| CN105373163A (en) * | 2015-12-20 | 2016-03-02 | 成都雷纳斯科技有限公司 | Multifunctional intelligent control system for electric water heater |
| CN109830936A (en) * | 2019-02-26 | 2019-05-31 | 深圳乐桥电子有限公司 | A kind of current foldback circuit solving PTC breakdown |
| CN110631100A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Smoke machine circuit of dry combustion method is prevented in hot washing |
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| CN104967322A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Logic protection emitter coupling-type three-filtering nonlinear negative feedback switching voltage-stabilizing power supply |
| CN105373163A (en) * | 2015-12-20 | 2016-03-02 | 成都雷纳斯科技有限公司 | Multifunctional intelligent control system for electric water heater |
| CN109830936A (en) * | 2019-02-26 | 2019-05-31 | 深圳乐桥电子有限公司 | A kind of current foldback circuit solving PTC breakdown |
| CN110631100A (en) * | 2019-08-10 | 2019-12-31 | 中山华帝电子科技有限公司 | Smoke machine circuit of dry combustion method is prevented in hot washing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103475331B (en) | 2018-07-31 |
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