CN102623956A - 60-DEG C thermal circuit breaker - Google Patents
60-DEG C thermal circuit breaker Download PDFInfo
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- CN102623956A CN102623956A CN2012101250791A CN201210125079A CN102623956A CN 102623956 A CN102623956 A CN 102623956A CN 2012101250791 A CN2012101250791 A CN 2012101250791A CN 201210125079 A CN201210125079 A CN 201210125079A CN 102623956 A CN102623956 A CN 102623956A
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Abstract
The invention relates to a 60-DEG C thermal circuit breaker, which comprises an overtemperature protection control circuit, an electronic switch field effect transistor Q1, a 5V three terminal regulator U1, a negative power supply forming circuit for a comparer, a temperature sampling circuit, a sampling circuit follower circuit, a reference voltage forming circuit, a comparer circuit, an automatic shut-off circuit and a power supply filtering circuit. The 60-DEG C thermal circuit breaker is an overtemperature alarm protection device independent of a constant temperature control device. When the 60-DEG C thermal circuit breaker is used in a physiotherapeutic instrument with a heating function and the temperature rises abnormally, the treating surface does not exceed 60 DEG C. After protection action, the 60-DEG C thermal circuit breaker is not damaged and can be restarted up just by powering off the power supply and waiting the reduction of temperature, and the 60-DEG C thermal circuit breaker can restore to work. The protection state of the thermal circuit breaker can be self-locked and cannot automatically restore if no manual intervention exists once the protection action is carried out. The 60-DEG C thermal circuit breaker is applicable to various physiotherapeutic instruments with heating function.
Description
Technical field
The invention belongs to medical instruments field, relate to a kind of 60 degree thermal circuit berakers, be particularly useful in the various physiotherapeutic instrumentss that heating function arranged, in the rigid or soft treatment body of particularly various sharp moral therapeutic equipments, as 60 degree overtemperature prote parts.
Background technology
At present, in the therapeutic equipment universal standard of heating function was arranged, requirement will have the overtemperature prote circuit that is independent of constant temperature control circuit.When temperature anomaly raise, treatment face must not surpass 60 degree, and the overtemperature prote action can not recover automatically.In the rigid or soft treatment body of existing various sharp moral therapeutic equipments, the serviceability temperature protective tube is as the overtemperature prote element, because it is the element that can not recover automatically.But this way has a shortcoming: protective tube protection action in a single day (even mistake protection), and promptly self fuse and damage, must change, repair by the maintenance personal.Increase the quantity and the workload of repairing, also reduced prestige on quality.Increase user's trouble, influenced user's use confidence.
Summary of the invention
Problem to be solved by this invention is, overcomes the deficiency of prior art, and a kind of 60 degree thermal circuit berakers are provided, and adopts an overtemperature prote control circuit, and final executive component is an electronic switch.When thermostatic control was lost efficacy, temperature anomaly raises, and when reaching the protection temperature of setting (as: 60 degree), control circuit breaks off electronic switch, cuts off the power supply to the electric heating electric, stops the rising of temperature, plays the effect of overtemperature prote.And under the situation that does not have manual intervention, power supply to connect all the time, guard mode is kept all the time.Even temperature lowers, can not recover automatically yet.Until there being the people to get involved, artificial power cutoff, guard mode could be recovered.
The present invention solves its technical problem and takes following technical scheme to realize:
According to a kind of 60 degree thermal circuit berakers provided by the invention, comprise the overtemperature prote control circuit, institute
The overtemperature prote control circuit of stating forms circuit, temperature sampling circuit, sampled voltage follower circuit, reference voltage by electronic switch FET Q1,5V three terminal regulator U1, comparator with negative supply and forms circuit, comparator circuit, automatic shut-off circuit, electric source filter circuit and form, wherein:
Described electronic switch FET Q1 is made up of P channel MOS enhanced power FET; Positive 12V inlet wire connects the source electrode of electronic switch FET Q1, and the drain electrode of electronic switch FET Q1 is positive 12V output line, connects the load of electricity consumption; The grid of electronic switch FET Q1 is the control end of electronic switch; Connect the negative pole of voltage stabilizing didoe D2, the positive pole of D2 connects comparator output terminal, the break-make of comparator control electronic switch;
Described 5V three terminal regulator U1 provides 5V reference voltage, forms circuit supply to temperature sampling circuit and reference voltage; The input of 5V three terminal regulator U1 connects the positive pole of 12V inlet wire, and the output of 5V three terminal regulator U1 connects temperature sampling circuit and reference voltage forms circuit, is these two circuit supplies;
Described comparator forms circuit with negative supply, connects the negative electrode of voltage stabilizing didoe D1 by the ground terminal of 5V three terminal regulator U1, and the anode of voltage stabilizing didoe D1 connects the negative pole of 12V inlet wire; The tie point of the ground terminal of 5V three terminal regulator U1 and the negative electrode of voltage stabilizing didoe D1 is the inner 0V point of thermal circuit beraker; And the current potential that the anode of voltage stabilizing didoe D1 is ordered with respect to 0V is negative 2.5V; This negative 2.5V connects the negative power end of comparator, and the positive power source terminal of comparator connects positive 12V inlet wire;
Described temperature sampling circuit is made up of resistance R 0, thermistor R1, the precision resistance R2 of adjustment protection temperature; The output of 5V three terminal regulator U1 connects the resistance R 0 of adjustment protection temperature; The other end serial connection thermistor R1 of the resistance R 0 of adjustment protection temperature; The other end serial connection precision resistance R2 of thermistor R1, the inner 0V point of another termination of precision resistance R2, the voltage that the tie point of thermistor R1 and precision resistance R2 is ordered to 0V is temperature sampling voltage;
Described sampled voltage follower circuit is made up of resistance R 9, capacitor C 2, diode D3, voltage follower: at the tie point connecting resistance R9 of thermistor R1 and precision resistance R2, and another termination capacitor C 2 of resistance R 9, another termination 0V point of capacitor C 2; Voltage follower and comparator are made up of a double operational; One of them amplifier is connected into voltage follower; The tie point of resistance R 9 and capacitor C 2 connects the in-phase input end of voltage follower, and inverting input links to each other with output, is connected into voltage follower circuit; The voltage that the output of voltage follower is ordered to 0V is identical with sampled voltage; The positive pole of the output terminating diode D3 of voltage follower, diode D3 negative pole is received the in-phase input end of comparator, and the voltage that in-phase input end is ordered to 0V is exactly comparative voltage;
Described reference voltage forms circuit and is made up of precision resistance R3, precision resistance R4, precision resistance R10, diode D4.The output termination precision resistance R3 of 5V three terminal regulator U1, another termination precision resistance R4 of precision resistance R3, another termination 0V point of precision resistance R4; The tie point of precision resistance R3 and precision resistance R4 connects the positive pole of diode D4, and the negative pole of diode D4 meets precision resistance R10, another termination 0V point of precision resistance R10; The voltage that diode D4 and precision resistance R10 tie point are ordered to 0V is exactly reference voltage, receives reference voltage the inverting input of comparator;
Described comparator circuit is made up of comparator, capacitor C 5, voltage stabilizing didoe D2, resistance R 7, resistance R 8; An amplifier with in the double operational integrated circuit is connected into comparator; Inverting input connects reference voltage, and in-phase input end connects comparative voltage, between two inputs, connects a capacitor C 5; The positive pole of the output termination voltage stabilizing didoe D2 of comparator; The negative pole of voltage stabilizing didoe D2 connects the grid of electronic switch FET Q1, between the grid of electronic switch FET Q1 and source electrode, connects bleeder resistance R7, between comparator output terminal is to the 12V negative pole, is connected with resistance R 8;
Described automatic shut-off circuit is made up of resistance R 5, resistance R 6, diode D3; At the output of comparator to being connected to resistance R 6 between the in-phase input end; Between the 0V point, be connected to resistance R 5 at in-phase input end, output to from voltage follower and be connected with diode D3 between the comparator in-phase input end;
Described electric source filter circuit divides three parts: first is made up of the positive supply filter circuit of comparator resistance R 11, capacitor C 3; Resistance R 11 1 termination 12V inlet wires are anodal; Another termination capacitor C 3; Another termination 12V inlet wire negative pole of capacitor C 3, the tie point of resistance R 11 and capacitor C 3 connects the positive power source terminal of comparator; Second portion is by the filter capacitor of capacitor C 4 as the 12V inlet wire, and the two ends of capacitor C 4 connect the both positive and negative polarity of 12V inlet wire respectively; Third part is by the output filter capacitor of capacitor C 1 as 5V three terminal regulator U1, and the two ends of capacitor C 1 connect the output and the ground terminal of 5V three terminal regulator respectively.
The present invention compared with prior art has significant advantage and beneficial effect:
Because the present invention adopts the forecast scheme configuration of electronic switch, it can cut off the DC power-supply circuit of heater, makes it to lose power supply, thereby has prevented the improper rising of temperature.The overtemperature alarm protective device that is independent of thermostatically-controlled equipment is arranged, when appearance temperature raises unusually, be used for the treatment face that guarantees to be no more than 60C; And 60 degree thermal circuit berakers itself do not damage, as long as powered-down, treat that temperature lowers after; Again start can be resumed work.Unlike temperature safety tube, protection has been moved, and itself has just fused, and has damaged.Must just can resume work through repairing.In addition, the guard mode of thermal circuit beraker can self-locking, in case protection has been moved, as long as do not close mains switch, even temperature lowers, the protection action does not recover yet, and is keeping guard mode always.Have, the protection operating temperature of thermal circuit beraker can change again.As long as change the resistance of a resistance, can raise or reduce temperature subtly, can satisfy the requirement of different protection temperature easily.This point, Temperature protection is not accomplished yet.
Embodiment of the present invention is provided by following examples and accompanying drawing thereof in detail.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, characteristic and effect thereof, specify as after.
A kind of 60 degree thermal circuit berakers as shown in Figure 1; Actual is the overtemperature prote control circuit; Described overtemperature prote control circuit; Form circuit, comparator circuit, automatic shut-off circuit, electric source filter circuit and form by forming circuit, temperature sampling circuit, sampled voltage follower circuit, reference voltage with negative supply as the P channel MOS FET Q1 of electronic switch, 5V three terminal regulator U1, comparator, wherein:
Described electronic switch FET Q1 is made up of P channel MOS enhanced power FET; Positive 12V inlet wire connects the source electrode of electronic switch FET Q1, and the drain electrode of electronic switch FET Q1 is positive 12V output line, connects the load of electricity consumption; The grid of electronic switch FET Q1 is the control end of electronic switch; Connect the negative pole of voltage stabilizing didoe D2, the positive pole of D2 connects comparator output terminal, the break-make of comparator control electronic switch; Switch connection during the comparator output low level, switch breaks off during high level.
Described 5V three terminal regulator U1 provides 5V reference voltage, forms circuit supply to temperature sampling circuit and reference voltage, and the output of three terminal regulator is stable, pure direct voltage; The input of 5V three terminal regulator U1 connects the positive pole of 12V inlet wire, and the output of 5V three terminal regulator U1 connects temperature sampling circuit and reference voltage forms circuit, is these two circuit supplies;
Described comparator forms the negative electrode (the K utmost point) of circuit by the ground terminal connection 2.5V voltage-reference diode D1 TL431 of 5V three terminal regulator U1 with negative supply, and the anode (the A utmost point) of 2.5V voltage-stabiliser tube D1 TL431 connects the negative pole of 12V inlet wire; 2.5V the control termination of voltage-reference diode D1 TL431 self the K utmost point.The voltage stabilizing value of TL431 is 2.5V.The tie point of the negative electrode of the ground terminal of 5V three terminal regulator U1 and 2.5V voltage-stabiliser tube D1 TL431 is the inner 0V point of thermal circuit beraker; And the current potential that the anode of voltage-stabiliser tube D1 is ordered with respect to 0V is negative 2.5V; This negative 2.5V connects the negative power end of comparator, and the positive power source terminal of comparator connects positive 12V inlet wire.With respect to inner 0V point, realized that comparator is the negative and positive dual power power supply.
Described temperature sampling circuit is made up of resistance R 0, negative tempperature coefficient thermistor R1, the precision resistance R2 of adjustment protection temperature; The output of 5V three terminal regulator U1 connects resistance R 0; The other end serial connection thermistor R1 of R0; The other end serial connection precision resistance R2 of thermistor R1, the inner 0V point of another termination of precision resistance R2, the voltage that the tie point of thermistor R1 and precision resistance R2 is ordered to 0V is temperature sampling voltage; Because the resistance of thermistor reduces with the rising of temperature, so the sampled voltage of getting on the R2 also increases with the rising of temperature.Temperature value corresponding a magnitude of voltage, strict functional relation is arranged.So a magnitude of voltage is represented a temperature, so the voltage of getting on the R2 is claimed " sampled voltage ".
The voltage follower that described sampled voltage follower circuit is connected into by amplifier, resistance R 9, capacitor C 2, diode D3 form: at the tie point connecting resistance R9 of thermistor R1 and precision resistance R2; Another termination capacitor C 2 of resistance R 9, another termination 0V point of capacitor C 2; Resistance R 9 is formed a filter with capacitor C 2; The 50Hz alternating voltage that possibly respond on the long line of filtering thermistor; Voltage follower and comparator are made up of a double operational LM358, and the tie point of resistance R 9 and capacitor C 2 connects the in-phase input end of voltage follower, i.e. 3 pin of LM358.Inverting input 2 pin link to each other with output 1 pin, are connected into follower circuit.Voltage and sampled voltage that the output of voltage follower is ordered to 0V are basic identical, and output 1 pin of voltage follower connects the positive pole of diode D3, and diode D3 negative pole is received the in-phase input end of comparator, i.e. 5 pin of LM358.The voltage that in-phase input end is ordered to 0V is exactly " comparative voltage ".
Described reference voltage forms circuit and is made up of for ± 1% precision resistance R3, precision resistance R4, precision resistance R10, diode D4 error.The output termination precision resistance R3 of 5V three terminal regulator U1, another termination precision resistance R4 of precision resistance R3, another termination 0V point of precision resistance R4; The tie point of precision resistance R3 and precision resistance R4 connects the positive pole of diode D4, and the negative pole of diode D4 meets precision resistance R10, another termination 0V point of precision resistance R10; The voltage that diode D4 and precision resistance R10 tie point are ordered to 0V is exactly " reference voltage ", receives the inverting input of comparator, i.e. 6 pin of LM358 to reference voltage; The effect of diode D4 is that the temperature of compensation diode D3 is floated.
Described comparator circuit is comparator, capacitor C 5, voltage stabilizing didoe D2, resistance R 7 and R8 by an amplifier and is formed.An amplifier with among the double operational integrated circuit LM358 is connected into comparator, and inverting input 6 pin connect reference voltage, and in-phase input end 5 pin connect comparative voltage; Between two inputs, connect the capacitor C 5 of a 1uF; Capacitor C 5 has been arranged, only can accomplish relatively direct voltage, do not compared alternating voltage.The common-mode voltage that it can become any one tunnel disturbing pulse voltage transition wherein two-way all to have, thus do not participate in comparison, do not change the output state of comparator.Improved the antijamming capability of comparator; Output 7 pin of comparator connect the positive pole of 3.3V voltage stabilizing didoe D2, and the negative pole of voltage stabilizing didoe D2 connects the grid of electronic switch FET Q1, connect bleeder resistance R7 (10K) between the grid of Q1 and the source electrode.Through this passage of D2, comparator just can be controlled the conducting and the disconnection of electronic switch FET.The effect of D2 is to guarantee reliably pinch off of electronic switch FET; R7 is the bleeder resistance between electronic switch fet gate and source electrode, bleeds off the electric charge of grid source capacitance stores.Between comparator output terminal is to the 12V negative pole, be connected with resistance R 8 (10K), resistance R 7 plays a dividing potential drop effect with resistance R 8, guarantees that when just powering on comparator works is in normal condition.
Described automatic shut-off circuit is made up of resistance R 5, resistance R 6, diode D3, between in-phase input end 5 pin, is connected to resistance R 6 at output 7 pin of comparator, between the 0V point, is connected to resistance R 5 at in-phase input end 5 pin.This is a kind of method that connects of introducing strong positive feedback to amplifier.Export 1 pin from voltage follower and to comparator in-phase input end 5 pin, be connected with diode D3, when the protection action, D3 plays buffer action.During operate as normal, comparative voltage is lower than reference voltage, the comparator output low level, and the conducting of P channel electrons switched field effect pipe, load obtains 12V voltage.When temperature anomaly raise, the comparative voltage of in-phase end 5 pin was higher than the reference voltage of end of oppisite phase 6 pin, comparator toggles, and output output high level makes electronic switch FET pinch off, has stopped 12V output.When comparator output high level, because the dividing potential drop and the positive feedback effect of resistance R 6 and resistance R 5, make the current potential of in-phase input end be much higher than the current potential of inverting input, comparator is locked in rollover states, i.e. guard mode.This moment, diode D3 was by reverse bias; Blocked getting in touch between temperature sampling voltage 1 pin and comparator in-phase end 5 pin; Temperature sampling voltage can not influence the state of comparator again, and it is constant that comparator remains on the overtemperature prote state, realized in case protection with regard to automatic blocking.Until power-off, treat that temperature lowers after, start again, just unlocking is reworked.
Described electric source filter circuit divides three parts: first is made up of the positive supply filter circuit of comparator resistance R 11, capacitor C 3; Resistance R 11 1 termination 12V inlet wires are anodal, another termination capacitor C 3, another termination 12V inlet wire negative pole of capacitor C 3; The tie point of resistance R 11 and capacitor C 3 connects the positive power source terminal of comparator; Be 8 pin of LM358, like this, resistance R 11 and capacitor C 3 have been formed the positive supply filter circuit of comparator; Second portion is by the filter capacitor of capacitor C 4 as the 12V inlet wire, and the two ends of capacitor C 4 connect respectively on the positive and negative polar curve of 12V inlet wire, as the filter element of power input part branch; Third part is by the output filter capacitor of capacitor C 1 as 5V three terminal regulator U1, and the two ends of capacitor C 1 connect the output and the ground terminal of 5V three terminal regulator respectively, as the output filter capacitor and the electric capacity that prevents parasitic oscillation of 5V three terminal regulator.
Requiring error among Fig. 1 is 1% resistance, must use 1%, can not use 5% to replace, otherwise the protection point tolerance possibly surpass positive and negative 3 degree, and this is unallowed.
Whole elements of 60 degree thermal circuit berakers all are contained on the little wiring board.The size of wiring board is 42x10mm, and thick 1mm adds that component thickness is 4mm.In can being placed in the connecting groove of soft treatment body or treating between the proper air of body firmly.In order to dwindle the size of parts, all adopt surface mount elements.Draw three lines onboard altogether, be respectively+12V incoming line (red line); + 12V output line (green line); 12V negative line (blue line).
Technical indicator:
1. protection operating temperature: can more than 58 degree, regulate, by the resistance value decision of R0.
Use cold resistance R=5k Ω ± 1% at temperature sensor (thermistor), under the temperature-sensitive index B=3470 condition,
When R0=0 Ω, operating temperature is 58o ± 3oC;
When R0=560 Ω ± 1%, operating temperature is 72o ± 3oC.
More than the protection operating temperature is meant the temperature of thermistor present position.
There is the pad that is provided with by 1/6W resistance size at R0 place in the circuit board, can change resistance, is used for changing the temperature value of protection action.
2. electronic switch allows the direct current maximum passed through: 10A.
3. the current drain of thermal circuit beraker itself: when supplying power to 12V, about 9mA.
Operation principle:
The electronic switch of between red line and green line, forming by P ditch MOS enhancement mode FET.This electronic switch is connected at normal temperatures.Making has 12V voltage between green line and the blue line, supply with the treatment body and use.This is the normal operating conditions of protecting when not moving.
One of them amplifier by double operational LM358 is connected into comparator.The inverting input of this comparator (6 pin) connects " reference voltage ".This reference voltage is to be obtained after the precision resistance dividing potential drop by the reference voltage that three end power supply 78L05 provide.This reference voltage is temperature independent, not temperature influence.The in-phase input end of this comparator (5 pin) connects " comparative voltage ", and this comparative voltage is connected in series the back by temperature adjustment resistance R 0 and obtains with 5.1k Ω precision resistance R2 dividing potential drop with temperature sensor (thermistor).This voltage is connected into " follower " transmission through another amplifier of LM358, delivers to 5 pin of comparator again through a diode D3, and this voltage is exactly " comparative voltage " of reaction temperature state.
Protection is used same model with thermistor and constant temperature with thermistor, is placed on same position in the treatment body, experiences the temperature of heating plate simultaneously." comparative voltage " is lower than " reference voltage " at normal temperatures.When the temperature of heating plate raise, comparative voltage also raise gradually.When heating plate reaches thermostat temperature, and when being stabilized in this temperature, comparative voltage still forces down than reference electrode.Therefore, the output of comparator (7 pin of LM358) is output low level all the time, delivers to the P ditch metal-oxide-semiconductor field effect transistor grid as electronic switch, the FET conducting, and its conducting resistance has only several milliohms, can regard the switch of a connection as.The treatment body obtains the supply of 12V power supply.Under the normal condition, comparator and FET keep this state always, then treat the operating state that body maintains normal power supply.
Break down when treating body, thermostatic control is malfunctioning, and heating plate always works in heated condition, and when temperature constantly raise in the treatment body, comparative voltage also constantly raise thereupon.When comparative voltage equals even during greater than reference voltage, comparator toggles, 7 pin output high level is delivered to the grid of electronic switch FET, makes the FET pinch off, and then " electronic switch " breaks off.At this moment the output voltage of green line end becomes 0V from 12V.The treatment body can not get supply voltage, and heating plate has also just stopped heating.Prevent the generation of superheating phenomenon, played protective effect.
Comparator is connected to exclusive circuit in addition, in case upset is kept rollover states with regard to automatic blocking.This is connected into the positive feedback state to comparator and is accomplished by R6, R5.R6, R5 are the divider resistances of comparator output voltage.Be added in in-phase end to the voltage of getting on the R5, positive feedback that Here it is.Comparator is in case overturn just by locked.After the comparator toggles, because diode D3 is in anti-state partially, it plays buffer action between sampled voltage follower and comparator.After temperature reduced, the comparative voltage that has descended can not be delivered to 5 pin of comparator, " comparative voltage " effect out of hand.As long as therapeutic equipment does not cut out mains switch, just keep guard mode always.Even temperature has lowered, do not recover automatically yet.
After the temperature of treatment body lowers, if closed mains switch, treat to reclose mains switch again after electric capacity has been put electricity, then the lock release of comparator is accepted the control of " comparative voltage " again.Green line has had the 12V output voltage again, and the treatment body gets into operating state again.If overtemperature then can be protected once more once more.
The method for using of thermal circuit beraker:
Thermal circuit beraker is applied in the basic skills in the treatment body, seals in its " electronic switch " in the power supply circuits of treatment body exactly.Receive temperature controlled switch as one.When improper rising appears in temperature, cut off the electricity supply, prevent superheating phenomenon.
Concrete use and mode of connection are following:
1. mode of connection:
Join the red line of the 12V supply lines (red line) in treatment body five heart yearns with circuit breaker;
The end that heating plate and pulsed coil are prepared and supply lines joins, join with the green line of circuit breaker;
Constant temperature is with the earth terminal of thermistor in the blue line of circuit breaker and the heating plate, promptly blue line joins.This blue line is the negative line of 12V supply lines, is the loop to the circuit breaker power supply.Do not have big electric current above that, have only the consumed current of circuit breaker own.Whole heating currents and pulsed magnetic electric current that the treatment body is then arranged in red line and the green line.
In the treatment body of temperature safety tube was arranged, if want to replace temperature safety tube with thermal circuit beraker, then the red line of thermal circuit beraker should connect the red line of five heart yearns, and the green line of thermal circuit beraker should connect the line of load end.Both can not wrong, otherwise the treatment body can not be worked.And the blue line of thermal circuit beraker will join with the blue line of five heart yearns (being the earth terminal of constant temperature with thermistor), to ensure to the power supply of thermal circuit beraker.
2. protect placement location with thermistor:
Thermistor on the thermal circuit beraker will be placed on same position with thermistor with the constant temperature of heating plate, makes both experience identical temperature, can prevent the mistake protection like this.This point is very important.
If two thermistors are placed on different positions, because the temperature of diverse location maybe be different in the treatment body, the mistake protection then might take place or leak protection.
3. the adjustment of protection operating temperature:
Because the difference of various element actual numerical values causes between each different thermal circuit beraker, its protection operating temperature also slightly variant (in the batch process, in ± 3oC).When the protection temperature that requires does not conform to circuit breaker preset protection temperature, can protect temperature adjustment to it.Method is the value that changes temperature adjustment resistance R 0.The R0 resistance strengthens, and then temperature improves; The R0 resistance reduces, and then temperature reduces.Be about every variation 30 Ω, temperature change 1oC (on the basis of existing 560 Ω of R0, is this value when changing again.When R0=0 Ω, be about 50 Ω/oC).
4. subordinate list: the value of temperature adjustment resistance R 0 and the protection temperature table of comparisons
Annotate: " protection temperature " is meant the temperature of temperature sensor (being temperature-sensitive resistance) present position.It is the internal temperature of treatment body.Surface temperature than the treatment body is high.Both difference depends on the thermal resistance of treating body case and the temperature difference from the temperature sensor to the outer casing inner wall.The value of temperature adjustment resistance R 0 sees following table 1 for details with the protection temperature table of comparisons:
Table 1:
| The protection temperature | The R0 exact value | But 1% serial R0 value | But 5% serial R0 value |
| Degree centigrade | Ohm | Ohm | Ohm |
| 75 | 641 | 649 | 620 |
| 74 | 613 | 619 | 620 |
| 73 | 584 | 590 | 560 |
| 72 | 554 | 560 | 560 |
| 71 | 522 | 523 | 510 |
| 70 | 490 | 487 | 510 |
| 69 | 456 | 453 | 470 |
| 68 | 421 | 422 | 430 |
| 67 | 385 | 383 | 390 |
| 66 | 348 | 348 | 360 |
| 65 | 310 | 309 | 300 |
| 64 | 271 | 270 | 270 |
| 63 | 231 | 232 | 240 |
| 62 | 188 | 187 | 200 |
| 61 | 143 | 143 | 150 |
| 60 | 96 | 95.3 | 91 |
| 59 | 49 | 48.7 | 51 |
| 58 | 0 | 0 | 0 |
Maintenance after thermal circuit beraker breaks down:
All do not have disconnected at heater wire and pulsed coil; Five heart yearns do not have one of following two kinds of phenomenons to occur under the situation of broken string yet, can be judged as thermal circuit beraker and break down:
Start and be provided with heating and pulsed magnetic after, treat body and do not heat, do not have pulsed magnetic yet.Flashlight on the treatment body does not work yet.This is " mistake protection ", does not have overtemperature and gets into guard mode.
2. the surface temperature of treatment body raises unusually, has surpassed 63 degree, even has reached 65 degree, does not still have the sign of protection, and flashlight is still in flicker; Temperature is continuing rising.This is " leaking protection ", overtemperature, but protection not action.
Second kind of above-mentioned phenomenon after having keeped in repair thermal circuit beraker, also will be searched the reason that temperature anomaly raises, and get rid of it.
Because what use on the thermal circuit beraker wiring board all is surface mount elements, is not easy to field Welding and changes element.So field service should be main with the whole wiring board of direct replacing.To carefully all be transplanted to the thermistor on the raw sheet, temperature adjustment resistance R 0 on the new plate, weld three lines by the original position correspondence again, not wrong.Fix thermistor and wiring board, the test-run a machine of can switching on.
When thermal circuit beraker is taken back maintenance, weld with lower-powered microbrenner.After pulling down former surface mount elements, before the repair welding new element, not have the position of scolding tin at the element center, component affixing in the circuit board, carry out welding again with the fritter double-sided adhesive.So be convenient to operation.Attention: adhesive sticker can only be bonded at the middle part of element, can not expand to the scolding tin position of element, otherwise, cause rosin joint easily.
The treatment body gets into the performance after the guard mode:
After general treatment body heat circuit breaker got into guard mode, primary was to lose the power supply power supply, and heating plate stops heating, and pulsed magnetic has not had yet.The temperature of treatment body can reduce gradually.For main frame, then can send the corresponding chimes of doom of " heater strip is disconnected " and/or " pulsed coil is disconnected " with fault diagnosis functions.
Versions in 2011 with LD-20B are example below, and the performance state that gets into after protecting is described:
1. the flashlight on the treatment body extinguishes, no longer flicker (on blue LD-20B treatment body, flashlight being arranged).Simultaneously, pulsed magnetic has not had yet.
2. the treatment body no longer heats, and temperature begins to descend.Even but temperature lowers, guard mode is also still kept, and does not recover.If shutdown after temperature lowers is waited for after charactron extinguishes and being started shooting, can resume work.Guard mode is then still kept in the start again if temperature does not just lower.
3. the warning phenomenon of " ringing when subtracting " can appear in main frame.Promptly whenever subtract at 1 o'clock, an acoustic alarm sound of " ticking " occurs at the number that shows the time.
4.A two of road treatment body A1 and A2, when one of them overtemperature prote, frequency modulation of another treatment body can not extinguish fully, by bright, going out to become is bright, dark variation.This is a normal phenomenon, is not fault.This is because influencing each other of being caused of A1 and the shared FET driving pulse magnetic of A2 two-way.Pull up the treatment body plug of overtemperature prote, another treatment body promptly recovers normal.
5. the guard mode of respectively treating body is independently, and it has stopped heating and pulsed magnetic itself behind some treatment body overtemperature protes, and other treatment body still can work on.After certain treatment body protection, the state that is provided with of main frame does not change yet.
The expanded application of thermal circuit beraker:
This thermal circuit beraker comes down to one " the overload alarm controller " that can be used for various physical quantitys.Top example application is to be used for overtemperature prote.The sensing element that uses is thermally sensitive thermistor.Be transformed into direct voltage to resistance with variation of temperature with variation of temperature.Compare then and report to the police.
The physical quantity of reporting to the police if desired is a pressure; Flow; During weight or the like; Only need use the sensing element corresponding instead, become corresponding voltage to the value of physical quantity, this voltage is carried out suitable decay or amplification with physical quantity; Make it to be fit to the operating voltage range of comparator, just can use this " overload alarm controller " to carry out alarm operation.
The core of " overload alarm controller " is a comparator.Comparator has one " reference voltage ", also has a voltage that changes with physical quantity, i.e. " comparative voltage ".The pairing magnitude of voltage of the alarming value of physical quantity, be set to the magnitude of voltage of " reference voltage ".When " comparative voltage " reaches the value of " reference voltage ", just explain that physical quantity has reached alarming value, at this moment comparator toggles is carried out alarm operation.This has just realized the overload alarm of this physical quantity.So, this overload alarm controller be one can be general the overload alarm controller, can realize the overload alarm of various physical quantitys.If increase relay and contactor at the back at electronic switch, then DC power supply can not only be cut off, and single phase alternating current (A.C.) or three-phase alternating-current supply can be cut off, realize the overload alarm and protection action of various power supply forms.
Claims (1)
1. spend thermal circuit beraker for one kind 60; Comprise the overtemperature prote control circuit; It is characterized in that: described overtemperature prote control circuit forms circuit, temperature sampling circuit, sampled voltage follower circuit, reference voltage by electronic switch FET Q1,5V three terminal regulator U1, comparator with negative supply and forms circuit, comparator circuit, automatic shut-off circuit, electric source filter circuit and form, wherein:
Described electronic switch FET Q1 is made up of P channel MOS enhanced power FET; Positive 12V inlet wire connects the source electrode of electronic switch FET Q1, and the drain electrode of electronic switch FET Q1 is positive 12V output line, connects the load of electricity consumption; The grid of electronic switch FET Q1 is the control end of electronic switch; Connect the negative pole of voltage stabilizing didoe D2, the positive pole of D2 connects comparator output terminal, the break-make of comparator control electronic switch;
Described 5V three terminal regulator U1 provides 5V reference voltage, forms circuit supply to temperature sampling circuit and reference voltage; The input of 5V three terminal regulator U1 connects the positive pole of 12V inlet wire, and the output of 5V three terminal regulator U1 connects temperature sampling circuit and reference voltage forms circuit, is these two circuit supplies;
Described comparator forms the negative electrode of circuit by the ground terminal connection voltage stabilizing didoe D1 of 5V three terminal regulator U1 with negative supply, and the anode of voltage stabilizing didoe D1 connects the negative pole of 12V inlet wire; The tie point of the ground terminal of 5V three terminal regulator U1 and the negative electrode of voltage stabilizing didoe D1 is the inner 0V point of thermal circuit beraker; And the current potential that the anode of voltage stabilizing didoe D1 is ordered with respect to 0V is negative 2.5V; This negative 2.5V connects the negative power end of comparator, and the positive power source terminal of comparator connects positive 12V inlet wire;
Described temperature sampling circuit is made up of resistance R 0, thermistor R1, the precision resistance R2 of adjustment protection temperature; The output of 5V three terminal regulator U1 connects the resistance R 0 of adjustment protection temperature; The other end serial connection thermistor R1 of the resistance R 0 of adjustment protection temperature; The other end serial connection precision resistance R2 of thermistor R1, the inner 0V point of another termination of precision resistance R2, the voltage that the tie point of thermistor R1 and precision resistance R2 is ordered to 0V is temperature sampling voltage;
Described sampled voltage follower circuit is made up of resistance R 9, capacitor C 2, diode D3, voltage follower: at the tie point connecting resistance R9 of thermistor R1 and precision resistance R2, and another termination capacitor C 2 of resistance R 9, another termination 0V point of capacitor C 2; Voltage follower and comparator are made up of a double operational, and one of them amplifier is connected into voltage follower, and the tie point of resistance R 9 and capacitor C 2 connects the in-phase input end of voltage follower, and inverting input links to each other with output, is connected into voltage follower circuit.The voltage that the output of voltage follower is ordered to 0V is identical with sampled voltage, the positive pole of the output terminating diode D3 of voltage follower, and diode D3 negative pole is received the in-phase input end of comparator, and the voltage that in-phase input end is ordered to 0V is exactly comparative voltage;
Described reference voltage forms circuit and is made up of precision resistance R3, precision resistance R4, precision resistance R10, diode D4; The output termination precision resistance R3 of 5V three terminal regulator U1; Another termination precision resistance R4 of precision resistance R3, another termination 0V point of precision resistance R4; The tie point of precision resistance R3 and precision resistance R4 connects the positive pole of diode D4, and the negative pole of diode D4 meets precision resistance R10, another termination 0V point of precision resistance R10; The voltage that diode D4 and precision resistance R10 tie point are ordered to 0V is exactly reference voltage, receives reference voltage the inverting input of comparator;
Described comparator circuit is made up of comparator, capacitor C 5, voltage stabilizing didoe D2, resistance R 7, resistance R 8; An amplifier with in the double operational integrated circuit is connected into comparator; Inverting input connects reference voltage, and in-phase input end connects comparative voltage, between two inputs, connects a capacitor C 5; The positive pole of the output termination voltage stabilizing didoe D2 of comparator; The negative pole of voltage stabilizing didoe D2 connects the grid of electronic switch FET Q1, between the grid of electronic switch FET Q1 and source electrode, connects bleeder resistance R7, between comparator output terminal is to the 12V negative pole, is connected with resistance R 8;
Described automatic shut-off circuit is made up of resistance R 5, resistance R 6, diode D3; At the output of comparator to being connected to resistance R 6 between the in-phase input end; Between the 0V point, be connected to resistance R 5 at in-phase input end, output to from voltage follower and be connected with diode D3 between the comparator in-phase input end;
Described electric source filter circuit divides three parts: first is made up of the positive supply filter circuit of comparator resistance R 11, capacitor C 3; Resistance R 11 1 termination 12V inlet wires are anodal; Another termination capacitor C 3; Another termination 12V inlet wire negative pole of capacitor C 3, the tie point of resistance R 11 and capacitor C 3 connects the positive power source terminal of comparator; Second portion is by the filter capacitor of capacitor C 4 as the 12V inlet wire, and the two ends of capacitor C 4 connect the both positive and negative polarity of 12V inlet wire respectively; Third part is by the output filter capacitor of capacitor C 1 as 5V three terminal regulator U1, and the two ends of capacitor C 1 connect the output and the ground terminal of 5V three terminal regulator respectively.
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| CN2012101250791A CN102623956A (en) | 2012-04-26 | 2012-04-26 | 60-DEG C thermal circuit breaker |
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| CN2012101250791A CN102623956A (en) | 2012-04-26 | 2012-04-26 | 60-DEG C thermal circuit breaker |
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| CN103245328A (en) * | 2013-04-16 | 2013-08-14 | 河南中光学集团有限公司 | Automatic universal digital attitude measuring circuit |
| CN104967305A (en) * | 2015-06-05 | 2015-10-07 | 惠而浦（中国）股份有限公司 | Automatic power-off discharge control circuit and automatic discharge method |
| CN105226608A (en) * | 2015-10-30 | 2016-01-06 | 深圳市共进电子股份有限公司 | A kind of overheating protection circuit and Set Top Box |
| CN105610126A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
| CN105610125A (en) * | 2015-12-24 | 2016-05-25 | 深圳市共进电子股份有限公司 | Overtemperature protection circuit of network equipment |
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| CN107509259A (en) * | 2017-09-13 | 2017-12-22 | 广州龙之杰科技有限公司 | A kind of heating apparatus and method with self-lock protection function |
| CN110474622A (en) * | 2019-08-22 | 2019-11-19 | 海信（山东）空调有限公司 | A kind of self-locking protective circuit and air conditioner |
| CN110474622B (en) * | 2019-08-22 | 2023-08-15 | 海信空调有限公司 | Self-locking protection circuit and air conditioner |
| CN111416329A (en) * | 2020-03-31 | 2020-07-14 | 上海空间电源研究所 | Shunt switch tube overheat protection circuit for aerospace power supply |
| CN113253613A (en) * | 2021-06-21 | 2021-08-13 | 武汉中原电子信息有限公司 | Circuit breaker control method and system based on RSM prediction model |
| CN113253613B (en) * | 2021-06-21 | 2021-10-08 | 武汉中原电子信息有限公司 | Circuit breaker control method and system based on RSM prediction model |
| CN115754797A (en) * | 2021-09-03 | 2023-03-07 | 合肥美的电冰箱有限公司 | Pulse lamp state detection method and sterilization cabinet |
| CN115754797B (en) * | 2021-09-03 | 2023-12-15 | 合肥美的电冰箱有限公司 | Pulse lamp state detection method and sterilizing cabinet |
| CN113992117A (en) * | 2021-11-01 | 2022-01-28 | 常州机电职业技术学院 | Motor control system for robot with temperature automatic compensation function |
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Application publication date: 20120801 |