CN103475332A - Electric heater protection device and electric heater - Google Patents
Electric heater protection device and electric heater Download PDFInfo
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- CN103475332A CN103475332A CN2012101872431A CN201210187243A CN103475332A CN 103475332 A CN103475332 A CN 103475332A CN 2012101872431 A CN2012101872431 A CN 2012101872431A CN 201210187243 A CN201210187243 A CN 201210187243A CN 103475332 A CN103475332 A CN 103475332A
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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 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
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 signal generating unit to the enable port of electric heater or drive port to send for frequency 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.The present invention is 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.
Described filter circuit only comprises the high pass filter that allows the signal higher than certain frequency to pass through, 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) change AC signal into direct current signal;
(30) make direct current signal realize switch control by switching component;
(40) 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 can be high-pass filtering circuit, and described filter circuit can be the first-level filtering ripple; Described filter circuit comprises high pass filter, rectifier diode D01, the capacitor C 03 and resistance R 04, switching component that resistance R 02 and capacitor C 01 form; After signal generating unit sends and drives signal, the high pass filter first formed by resistance R 02 and capacitor C 01, pass through high pass filter higher than the AC signal of certain frequency; Then AC signal by rectifier diode D01, becomes direct current signal again, and then, by capacitor C 03 and resistance R 04, 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 switching component of described filter circuit can be triode Q01; The capacitor C 03 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 04, the other end is connected with negative electrode, the resistance R 03 of rectifier diode D01, the anodic bonding capacitor C 01 of rectifier diode D01, an end of resistance R 02, the other end of capacitor C 01 is connected to the output port of signal generating unit, and the other end ground connection of resistance R 02; The other end of resistance R 03 is connected to the base stage of triode Q01, the grounded emitter of triode Q01, and the collector electrode of triode Q01 is connected to the switching component of drive circuit;
Perhaps, described triode Q01 is substituted by field effect transistor or Darlington transistor.
Described filter circuit can be also bandwidth-limited circuit, and described filter circuit is one-level filtering, and described filter circuit also comprises a low pass filter that only allows the signal lower than certain frequency to pass through; Described filter circuit comprises low pass filter, rectifier diode D11, the capacitor C 13 and resistance R 14, switching component of high pass filter, resistance R 11 and capacitor C 12 compositions that resistance R 12 and capacitor C 11 form; The input of described high pass filter or low pass filter is connected with the signal output part of signal generating unit, after signal generating unit sends and drives signal, first by high pass filter, again by low pass filter or first by low pass filter, pass through high pass filter again; And then, by rectifier diode D11, become direct current signal, and then, by capacitor C 13 and resistance R 14, 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, and the switch output signal of switching component is connected to the input of the drive circuit of described electric heater, 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 filter circuit can be high-pass filtering circuit, and described filter circuit is one-level filtering; Described filter circuit comprises high pass filter, rectifier diode D21, the capacitor C 23 and resistance R 24, switching component that resistance R 21 and inductance L 21 form; After signal generating unit sends and drives signal, the high pass filter first formed by resistance R 21 and inductance L 21, pass through high pass filter higher than the AC signal of certain frequency; Then AC signal by rectifier diode D21, becomes direct current signal again, and then, by capacitor C 23 and resistance R 24, 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.
Described filter circuit can be bandwidth-limited circuit, and described filter circuit is one-level filtering; Described filter circuit comprises low pass filter, rectifier diode D31, the capacitor C 33 and resistance R 34, switching component of high pass filter, resistance R 32 and inductance L 32 compositions that resistance R 31 and inductance L 31 form; The input of described high pass filter or low pass filter is connected with the signal output part of signal generating unit, after signal generating unit sends and drives signal, first by high pass filter, again by low pass filter or first by low pass filter, pass through high pass filter again; And then, by rectifier diode D31, become direct current signal, and then, by capacitor C 33 and resistance R 34, 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, and the switch output signal of switching component is connected to the input of the drive circuit of described electric heater, thereby realizes the switch of the drive circuit of described electric heater is controlled.
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 electric heater protective device as described above, the filter circuit of described electric heater protective device is passive 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 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, the output of the switching component of described filter circuit is connected to two groups of described electric heater or organizes the switching component of the drive circuit of heating core more, 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 in addition.Circuit is relatively simple like this, and low cost of manufacture, connects also relatively simple.
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.
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;
Fig. 5 is the connection diagram of the 5th kind of embodiment circuit of the present invention;
Fig. 6 is the connection diagram of the 6th kind of embodiment circuit of the present invention;
Fig. 7 is the connection diagram of the 7th kind of embodiment circuit of the present invention;
Fig. 8 is the connection diagram of the 8th kind of embodiment circuit of the present invention;
Fig. 9 is the connection diagram of the 9th 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 the circuit of the heating core of electric heater, present embodiment is to be provided with the one-level high-pass filtering 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; Drive circuit comprises resistance R 05, 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 part in Fig. 1, comprise capacitor C 01, resistance R 02, rectifier diode D01, resistance R 03, capacitor C 03, resistance R 04, NPN triode Q01, wherein capacitor C 03 is arranged in parallel a rear end ground connection with resistance R 04, the other end is connected with negative electrode, the resistance R 03 of rectifier diode D01, the anodic bonding capacitor C 01 of rectifier diode D01, an end of resistance R 02, the other end of capacitor C 01 is connected to the output port of main control singlechip MCU, and the other end ground connection of resistance R 02; The other end of resistance R 03 is connected to the base stage of NPN triode Q01, the grounded emitter of NPN triode Q01, the collector electrode of NPN triode Q01 is connected to power supply VCC port by resistance R 05 and is connected to the base stage of the triode Q2 of drive circuit by the resistance R 7 of drive circuit.
This high-pass filtering circuit only allows the high pass filter formed by R02 and C01 higher than the signal of a certain frequency, the appearance value of the decay of the frequency of signal and capacitor C 01 and the resistance of resistance R 02 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 R02 and C01, higher than the AC signal of certain frequency, pass through high pass filter; Above AC signal, by rectifier diode D01, becomes direct current signal, and, by C03 and R04, becomes the comparatively stable direct current signal of voltage; Above direct current signal, be used for controlling the switch of triode Q01, thereby realize the control to triode Q2, thus control relay K1; The final switch control realized one group of heating core 2 of PTC.Wherein the collector electrode of NPN triode Q01 is connected to the base stage of triode Q2 by resistance R 7, and the emitter of triode Q2 is connected to power supply VCC end, and the collector electrode of triode Q2 is connected to relay K 1.
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.
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.
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 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, wherein bandwidth-limited circuit is as shown in dotted line part in Fig. 2, bandwidth-limited circuit comprises capacitor C 11, resistance R 12, resistance R 11, capacitor C 12, rectifier diode D11, resistance R 13, capacitor C 13, resistance R 14, NPN triode Q11, wherein capacitor C 13 is arranged in parallel a rear end ground connection with resistance R 14, the negative electrode of the other end and rectifier diode D11, resistance R 13 connects, the anodic bonding capacitor C 12 of rectifier diode D11, one end of resistance R 11, the other end ground connection of capacitor C 12, the other end of resistance R 11 connects capacitor C 11, resistance R 12, the other end of capacitor C 11 is connected to the output port of main control singlechip MCU, and the other end ground connection of resistance R 12, the other end of resistance R 13 is connected to the base stage of NPN triode Q11, the grounded emitter of NPN triode Q11, the collector electrode of NPN triode Q11 is connected to power supply VCC port by resistance R 15 and is connected to the base stage of the triode Q2 of drive circuit by the resistance R 7 of drive circuit.
This bandwidth-limited circuit only allows the signal of certain limit frequency band by R12 and C11, the band pass filter network that R11 and C12 form, the decay of signal frequency and R12 and C11, R11 is relevant to C12, the minimum of the frequency range that permission is passed through is relevant to the appearance value of the resistance of R12 and C11, the peak of the frequency range that permission is passed through is relevant to the appearance value of the resistance of R11 and C12, the square-wave signal that main control singlechip MCU or other programmable, intelligent chips produce, by above-mentioned R12 and C11, the band pass filter of R11 and C12, what signal generating unit sent must be the pulse signal in the certain frequency scope, drive signal just can arrive the driving port, this group heating core of PTC just can be switched on, above AC signal, by rectifier diode D11, become direct current signal, and, by C13 and R14, become the comparatively stable direct current signal of voltage, above direct current signal, be used for controlling the switch of triode Q11, 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 driving port of 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 R12, C11 form in addition can be regulated with the order of the low pass filter be comprised of R11, C12, and the low pass filter soon be comprised of R11, C12 is arranged near signal generating unit, can form bandwidth-limited circuit too.
In superincumbent execution mode, 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 the Enable Pin that is connected to the PTC electric heater, and be connected to each heating core 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 Q01 in present embodiment by the high pass protective circuit, that the output of Q01 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 Q01, just can control the switch of above-mentioned Q61, K1 and Q62, K11 like this, Q1 has realized enable (ENABLE) of above-mentioned drive circuit.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.
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.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 output of Q11 connects is Q63, K1, the common port (COM end) of the PTC drive circuit that Q64, K11 form; As long as control the switch of Q11, just can control the switch of above-mentioned Q63, K1 and Q64, K11 like this, Q11 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.
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 Q1, Q11, 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.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, embodiment as shown in Figure 5-Figure 8, wherein Fig. 5 is the connection diagram that adopts the circuit that high-pass filtering circuit protected the heating core of electric heater, Fig. 6 is the connection diagram that adopts the circuit that bandwidth-limited circuit protected the heating core of electric heater, and the protective circuit of these two kinds of execution modes is the drive ends that are connected to the PTC electric heater; And Fig. 7 is the connection diagram that adopts the circuit that high-pass filtering circuit protected the heating core of electric heater; Fig. 8 is the connection diagram that adopts the circuit that bandwidth-limited circuit protected the heating core of electric heater, and the protective circuit of these two kinds of execution modes is the common ports (COM end or Enable Pin) that are connected to PTC electric heater drive circuit.
Wherein in the 5th execution mode high-pass filtering circuit as shown in dotted line frame part in Fig. 5, comprise inductance L 21, resistance R 21, rectifier diode D21, resistance R 23, capacitor C 23, resistance R 24, NPN triode Q21, wherein capacitor C 23 is arranged in parallel a rear end ground connection with resistance R 24, the other end is connected with negative electrode, the resistance R 23 of rectifier diode D21, the anodic bonding inductance L 21 of rectifier diode D21, an end of resistance R 21, the other end ground connection of inductance L 21, the other end of resistance R 21 is connected to the signal output port of main control singlechip MCU; The other end of resistance R 23 is connected to the base stage of NPN triode Q21, the grounded emitter of NPN triode Q21, the collector electrode of NPN triode Q21 is connected to power supply VCC port by resistance R 25 and is connected to the base stage of the triode Q2 of drive circuit by the resistance R 7 of drive circuit.
This high-pass filtering circuit only allows the high pass filter formed by R21 and L21 higher than the signal of a certain frequency, the decay of the frequency of signal is relevant to the resistance of inductance L 21 and resistance R 21, the square-wave signal that wherein main control singlechip MCU or other programmable, intelligent chips produce, by the high pass filter of inductance L 21 and resistance R 21, only have over the AC signal of certain frequency and can pass through; Above AC signal, by rectifier diode D21, becomes direct current signal, and, by C23 and R24, becomes the comparatively stable direct current signal of voltage; Above direct current signal, be used for controlling the switch of triode Q21, thereby realize the control to triode Q2, thus control relay K1; The final switch control realized one group of heating core 2 of PTC.
And the 6th execution mode shown in Fig. 6 and the difference of top the 5th execution mode are, the 6th execution mode is bandwidth-limited circuit, comprise inductance L 31, inductance L 32, resistance R 31, resistance R 32, rectifier diode D31, resistance R 33, capacitor C 33, resistance R 34, NPN triode Q31, this bandwidth-limited circuit only allows the signal of frequency in certain limit by R31 and L31, the band pass filter that R32 and L32 form, the decay of the frequency of signal and resistance R 31 and inductance L 31, resistance R 32 is relevant to inductance L 32, the minimum of the frequency range that permission is passed through is relevant with inductance L 31 to the resistance of R31, the peak of the frequency range that permission is passed through is relevant with inductance L 32 to the resistance of R32, concrete signal and control can be with reference to execution modes recited above, here introduce no longer in detail.
And the 7th execution mode and the main distinction of the 5th execution mode are connected mode different of the output of filter circuit, in this execution mode, the output of filter circuit is connected to the common port (COM end) of PTC drive circuit, and the output of filter circuit Q21 connects is Q61, the K1 of PTC drive circuit, the COM end of PTC drive circuit that Q62, K11 form; As long as control the switch of Q21, just can control the switch of above-mentioned Q61, K1 and Q62, K11 like this, Q21 has realized enable (ENABLE) of above-mentioned drive circuit.And the 8th this execution mode and the main distinction of the 6th this execution mode are connected mode different of the output of filter circuit equally, in this execution mode, the output of filter circuit is connected to the common port (COM end) of PTC drive circuit, that be that the output of filter circuit Q31 connects is Q61, the K1 of PTC drive circuit, the 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.
In execution mode described above, filter circuit is the one-level filtering mode, in addition also can be according to the needs of concrete system, be designed to secondary or above multiple-stage filtering mode, in addition, triode in above-mentioned execution mode can be also other switch amplifying circuits or the circuit elements device of realizing said function, as field effect transistor (metal-oxide-semiconductor) or Darlington transistor etc.The drive circuit of PTC electric heater, only draw two groups as problem definition in top execution mode, actual conditions can be 1 group, also can 2 groups or be greater than 2 many groups, and the principle of its connection and working method are identical.Filter 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.
In addition, in the embodiment that the above introduces, what filter circuit adopted is the passive filtering mode, in addition, the present invention can also adopt the active power filtering mode, as shown in Figure 9, Fig. 9 is the connection diagram of the 9th kind of embodiment circuit of the present invention, and present embodiment adopts the active power filtering mode.Particularly, filter circuit is as shown in dotted line frame part in Fig. 9, comprise capacitor C 41, resistance R 42, rectifier diode D41, resistance R 41, resistance R 43, capacitor C 43, resistance R 44, NPN triode Q41, feedback resistance Rf, operational amplifier U1A, 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, the anodic bonding feedback resistance Rf of rectifier diode D41 and the output of operational amplifier U1A; The reverse input end of one end ground connection of resistance R 41, other end concatenation operation amplifier U1A; One end contact resistance R42 of capacitor C 41 and the positive input of operational amplifier U1A, the other end of capacitor C 41 is connected to the output port of main control singlechip MCU; And the other end ground connection of resistance R 42; The other end ground connection of feedback resistance Rf; The other end of resistance R 43 is connected to the base stage of NPN triode Q41, the grounded emitter of NPN triode Q41, and the collector electrode of NPN triode Q41 is connected to power supply VCC port and is connected to the triode Q61 of drive circuit, the emitter of Q62 by resistance R 45.
The characteristics of this execution mode are by operational amplifier U1A is set 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.
In addition, in the execution mode that the above introduces, some components and parts can adopt other components and parts to substitute, and as triode can be substituted by field effect transistor or Darlington transistor, rectifier diode can substitute etc. with rectifier bridge.
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.
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, 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) change AC signal into direct current signal;
(30) make direct current signal realize switch control by switching component;
(40) 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 D01, the capacitor C 03 and resistance R 04, switching component that resistance R 02 and capacitor C 01 form; After signal generating unit sends and drives signal, the high pass filter first formed by resistance R 02 and capacitor C 01, pass through high pass filter higher than the AC signal of certain frequency; Then AC signal by rectifier diode D01, becomes direct current signal again, and then, by capacitor C 03 and resistance R 04, 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, the switching component of described filter circuit is triode Q01; The capacitor C 03 of described filter circuit is arranged in parallel a rear end ground connection with resistance R 04, the other end is connected with negative electrode, the resistance R 03 of rectifier diode D01, the anodic bonding capacitor C 01 of rectifier diode D01, an end of resistance R 02, the other end of capacitor C 01 is connected to the output port of signal generating unit, and the other end ground connection of resistance R 02; The other end of resistance R 03 is connected to the base stage of triode Q01, the grounded emitter of triode Q01, and the collector electrode of triode Q01 is connected to the switching component of drive circuit;
Perhaps, described triode Q01 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, and described filter circuit is one-level filtering, and described filter circuit also comprises a low pass filter that only allows the signal lower than certain frequency to pass through; Described filter circuit comprises low pass filter, rectifier diode D11, the capacitor C 13 and resistance R 14, switching component of high pass filter, resistance R 11 and capacitor C 12 compositions that resistance R 12 and capacitor C 11 form; The input of described high pass filter or low pass filter is connected with the signal output part of signal generating unit, after signal generating unit sends and drives signal, first by high pass filter, again by low pass filter or first by low pass filter, pass through high pass filter again; And then, by rectifier diode D11, become direct current signal, and then, by capacitor C 13 and resistance R 14, 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, and the switch output signal of switching component is connected to the input of the drive circuit of described electric heater, thereby realizes the switch of the drive circuit of described electric heater is controlled.
6. 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 D21, the capacitor C 23 and resistance R 24, switching component that resistance R 21 and inductance L 21 form; After signal generating unit sends and drives signal, the high pass filter first formed by resistance R 21 and inductance L 21, pass through high pass filter higher than the AC signal of certain frequency; Then AC signal by rectifier diode D21, becomes direct current signal again, and then, by capacitor C 23 and resistance R 24, 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.
7. electric heater protective device according to claim 1 and 2, is characterized in that, described filter circuit is bandwidth-limited circuit, and described filter circuit is one-level filtering; Described filter circuit comprises low pass filter, rectifier diode D31, the capacitor C 33 and resistance R 34, switching component of high pass filter, resistance R 32 and inductance L 32 compositions that resistance R 31 and inductance L 31 form; The input of described high pass filter or low pass filter is connected with the signal output part of signal generating unit, after signal generating unit sends and drives signal, first by high pass filter, again by low pass filter or first by low pass filter, pass through high pass filter again; And then, by rectifier diode D31, become direct current signal, and then, by capacitor C 33 and resistance R 34, 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, and the switch output signal of switching component is connected to the input of the drive circuit of described electric heater, thereby realizes the switch of the drive circuit of described electric heater is controlled.
8. 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 1-7, and the filter circuit of described electric heater protective device is passive filter circuit.
9. 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.
10. 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 two groups of described electric heater or organizes the switching component of the drive circuit of heating core more.
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| CN201210187243.1A CN103475332B (en) | 2012-06-08 | 2012-06-08 | A kind of electric heater protective device and electric heater |
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| CN201210187243.1A CN103475332B (en) | 2012-06-08 | 2012-06-08 | A kind of electric heater protective device and electric heater |
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| CN103475332B CN103475332B (en) | 2018-07-31 |
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| CN103475332B (en) | 2018-07-31 |
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