CN101656527B - Three-limit time-base circuit - Google Patents

Three-limit time-base circuit Download PDF

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CN101656527B
CN101656527B CN2008100489421A CN200810048942A CN101656527B CN 101656527 B CN101656527 B CN 101656527B CN 2008100489421 A CN2008100489421 A CN 2008100489421A CN 200810048942 A CN200810048942 A CN 200810048942A CN 101656527 B CN101656527 B CN 101656527B
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circuit
voltage comparator
resistance
input
operational amplifier
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CN101656527A (en
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刘圣平
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刘圣平
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Abstract

The invention provide a three-limit time-base circuit composed of analogue integrated circuit operational amplifier A (or voltage comparator B), few separate electronic elements by using new principle and ingenious connection mode. The three-limit time-base circuit has top and bottom limit main control functions completely compatible to all functions of classic 555 time-base circuit can be used as ultra-top and bottom limit control circuit and astable, monostable and bistable circuit. The invention increases exceed bottom limit protection and control function, when inputted sensing circuit has fault, fault display and protection control can be executed in time to prevent the main control circuit from being out of control. The invention, used in control circuits for temperature, pressure, water level etc., may improve security, and prevent severe accidents (such as fire hazard). So, the invention has wide use in electronic application field such as household electrical appliances, simple controllers, and high cost performance of products are provided.

Description

Three-limit time-base circuit
Technical field
The invention belongs to and utilize analog integrated circuit operational amplifier A (or voltage comparator B) fully, add a small amount of discrete electronic component, use new principle, with the simple three-limit time-base circuit that constitutes of connected mode cleverly.The compatible fully all functions through canonical form 555 time-base circuits of its bound master control function can be used as ultra spacing control circuit up and down and no stable state, monostable, bistable circuit.The present invention has increased and has surmounted lowest limit monitoring function, when the sensing circuit of input breaks down, can carry out in time that fault shows and protection control, prevents that governor circuit is out of control.Be applied in the control circuits such as temperature, pressure, water level, can improve its security performance.Avoid generation like serious accidents such as fire or pressure blasts.Therefore, the present invention is wider in electronic application field purposes such as small household appliances, ordinary surveying control, safety protection control, and makes product/price ratio higher.
Background technology
In order to examine novelty of the present invention.The designer has consulted a large amount of correlation technique data (professional book, newpapers and periodicals).A large amount of related patent U.S. Patent No. documents have been retrieved.The temperature-control circuit of all only finding completion master control (ultra spacing control up and down) function is more.But never find to relate to and master control function is carried out error protection control prevent related data out of control.
At present, electronic application field be used widely through canonical form 555 time-base circuits, as most basic versatility function element; By U.S. company development and design; After putting on market, enjoy electronic application professional designer and electrophile's favor, and obtained the common approval of academia at present; A lot of universities electronics specialty " digital circuit " textbook is listed 555 time-base circuits in certain chapters and sections.
Though it is, of many uses through canonical form 555 time-base circuit highly versatiles.But have only single master control (ultra spacing control up and down) function, internal structure is complicated, roughly is made up of five parts such as voltage divider, comparator, R-S trigger, rp-drive, discharge switch.8 of leading foot positions are if CMOS type 555 circuit are also wanted many two inverters (is used to reset, and another is located between R-S trigger Q end and the driver).Its principle is: voltage divider is provided with upper and lower bound, and comparator will import current potential and upper and lower bound is made comparisons, if the input current potential exceeds the upper limit or lower limit current potential; Two comparators are held with the R end or the S of pulse-triggered R-S trigger respectively; Q end output respective electrical mean longitude driver output control load, this control procedure and principle can only be accomplished ultra spacing controlled function up and down; Not having the error protection controlled function fully, is void item.On performance, have not good part in addition, it is improper that reset terminal MR (the 4th pin) reset potential is provided with, and discreteness is too big, can not make comparisons with the input current potential again.Control end VC (the 5th pin) upper limit of can only transfering to other localities, lower limit is built-in fixing.Because the R-S trigger is with pulsed, antijamming capability is not strong, so control end VC (the 5th pin) direct-to-ground capacitance is essential.
Summary of the invention
(1) the present invention mainly solves the simple ultra frequent failover of spacing control circuit up and down and technical problem out of control provides a kind of three-limit time-base circuit module that surmounts lowest limit monitoring and protection function that has, and improves the security performance of temperature control or pressure control or timing circuit.Be electronic application field such as small household appliances, safety protection control, offer as a tribute the higher basic general utility functions device of property/price ratio.
(2) for achieving the above object; The present invention has adopted following technical scheme and technical measures: utilize simulation integrated operational amplifier A (or voltage comparator B) fully; Cooperate a small amount of discrete electronic component,, simply constitute the three-limit time-base circuit functional module by new principle, with connected mode cleverly.Preferentially monitors back level Schmidt trigger by lowest limit comparator in the module, realizes the error protection controlled function, and master control (bound comparator) circuit output end with control of Electric potentials after the level Schmidt trigger, without the pulse-triggered late-class circuit.Two kinds of technical schemes are specifically arranged:
First kind of technical scheme is Fig. 1 circuit; By four simulation integrated operational amplifier A1~A4 in the frame of broken lines and semistor Ptc or fixed value resistance, resistance R 1~R6, diode D1, triode T1 composition module circuit; Operational amplifier A 1 is as lowest limit comparator; Operational amplifier A 2 is as upper limit comparator, and operational amplifier A 3 is as the lower limit comparator, and operational amplifier A 4 is as Schmidt trigger; Positive (+) input of operational amplifier A 1, A2, A3 also meets (assembly) signal input part (V in modular circuit I), anti-phase (-) input of operational amplifier A 2, A3 is provided with end (V as the upper limit of modular circuit respectively H) and lower limit end (V is set L), anti-phase (-) input of operational amplifier A 1 is provided with end (V as the lowest limit d), the lowest limit (V d) reference potential is that dividing point by semistor Ptc or fixed value resistance series resistance R1 provides, resistance R 1 other end connects positive source (V +), the semistor Ptc or the fixed value resistance other end connect power cathode (V -); The output of operational amplifier A 1 connects diode D1 negative pole, and the guarantor of anodal anti-phase (-) input and the modular circuit with operational amplifier A 4 of diode D1 is apparent/and reseting port BER links to each other; The output of operational amplifier A 2, A3, A4 connects resistance R 2, R3, R4 respectively, and positive (+) input of the other end of resistance R 2, R3, R4 and operational amplifier A 4 also connects (assembly) in circuit node V f, resistance R 5Be serially connected with circuit node V fAnd positive source (V +) between, resistance R 6Be serially connected with the output of triode T1 base stage and operational amplifier A 4; Triode T1 collector electrode is as the discharge end (DIS) of modular circuit, and the output of operational amplifier A 4 is as the control output end (V of modular circuit ZO) be connected with load driving circuits.
Second kind of technical scheme is Fig. 2 circuit; By four simulation integrated voltage comparator B1~B4 and semistor Ptc in the frame of broken lines or fixed value resistance, resistance R 1, R6, R8 composition module circuit; Voltage comparator B 1 is as lowest limit comparator; Voltage comparator B 2 is as upper limit comparator, and voltage comparator B 3 is as the lower limit comparator, and voltage comparator B 4 is as Schmidt trigger; Anti-phase (-) input of positive (+) input of voltage comparator B 1 and voltage comparator B 2, B3 also meets (assembly) signal input part (V in modular circuit I), positive (+) input of voltage comparator B 2 is provided with end (V as the upper limit of modular circuit H), positive (+) input of voltage comparator B 3 is provided with end (V as the lower limit of modular circuit L), anti-phase (-) input of voltage comparator B 1 is provided with end (V as the lowest limit d), the lowest limit (V d) reference potential is that dividing point by semistor Ptc or fixed value resistance series resistance R1 provides, resistance R 1 other end connects positive source (V +), the semistor Ptc or the fixed value resistance other end connect power cathode (V -); Be serially connected with resistance R 6 between the output of voltage comparator B 1, B2; Be serially connected with resistance R 8 between the output of voltage comparator B 2, B3; The output of voltage comparator B 1 also directly shows with the guarantor of modular circuit/and reseting port BER is connected, and the output of voltage comparator B 2 (Vm) is and directly be connected with anti-phase (-) input of voltage comparator B 4; Positive (+) input of voltage comparator B 4 is as the preferential control input end (FK) of modular circuit, and the output of voltage comparator B 4 is as the control output end (V of modular circuit ZO) be connected with load driving circuits.
(3) beneficial effect:
Because circuit connecting mode of the present invention is ingenious, simple in structure, principle is novel unique, thereby makes it produce significant beneficial effect: function is more, and performance is more excellent, and purposes is wider.
Specifically, and compare through canonical form 555 time-base circuits, the present invention has following ten differences and advantage:
1, the fully compatible all functions of function (that is: have ultra spacing control up and down, monostable, bistable state, astable multibrator, functions such as timer) through canonical form 555 time-base circuits, and the governor circuit structural principle is unique novel, and different fully with 555 circuit theories.
2, increased newly governor circuit has been got over end monitoring function (fault show and protection controlled function), improved the fail safe of reliability of applying and controlled electric appliance equipment in control circuits such as temperature, pressure, water level.
3, increased circuit module self overtemperature prote controlled function newly.
4, increased function setting port (FK) newly, for Application Design is expanded new function, the condition of providing convenience.
5, improved the circuit reset performance (among Fig. 1 less than 1/4V +Just can reset, Fig. 2 circuit is less than 1/3V +Just can reset, and the reset level of 555 circuit has only 0.4~1.0V, and discreteness is big, acts on limited), also can be as required, change the height of reset level, convenient in application by the function setting port.Protect apparent/reseting port (BER) and also have the error protection Presentation Function concurrently.
6, error protection control circuit (A1 and B1) excellent performance in when action protection, no threshold oscillation phenomenon, also can improve the unfavorable characteristic of Ntc low temperature high resistant.
7, input circuit is simple, has only a port, and high-low level triggers all effective, uses easy.
8, lower limit is provided with opening, and upper and lower spacing height and return difference size thereof, can be provided with arbitrarily, makes the input sensing circuit simple.
9, upper limit V H, lower limit V LEnd is set also can makes input use, former input V IPort also can be set use convenient in application.
10, because back level Schmidt circuit adopts current potential to trigger, without pulse-triggered, interference free performance is better, also can save anti-interference capacitor.
Therefore, the present invention is the upgrading type circuit of 555 time-base circuits, and purposes is wider, so abbreviate three-limit time-base circuit as.
Description of drawings
Fig. 1 is first kind of three-limit time-base circuit figure, also is the embodiment 1 that is applied to the easy temperature-adjusting circuit of tube.
Fig. 2 is second kind of three-limit time-base circuit figure, also is the embodiment 2 that is applied to the easy temperature-adjusting circuit of tube.
Embodiment
Below in conjunction with embodiment, and the contrast accompanying drawing, the essentiality content of two kinds of technical schemes of the present invention (belonging to same design) is elaborated respectively:
(1) first kind of technical scheme is exactly first kind of three-limit time-base circuit; Also be the embodiment 1 that is applied to the easy temperature-adjusting circuit of tube, as shown in Figure 1, the interior circuit of frame of broken lines is the core circuit in the module among the figure; The frame of broken lines external circuit is the outer application circuit of module; The inside and outside circuit connection interface of frame of broken lines boundary is exactly the leading foot of core circuit module, and pin symbol, pin name are following:
Module inner core circuit; Constitute by four simulation integrated operational amplifier A1~A4 in the frame of broken lines among Fig. 1 and semistor Ptc or fixed value resistance, resistance R 1~R6, diode D1, triode T1; Operational amplifier A 1 is as lowest limit comparator; Operational amplifier A 2 is as upper limit comparator, and operational amplifier A 3 is as the lower limit comparator, and operational amplifier A 4 is as Schmidt trigger; Positive (+) input of operational amplifier A 1, A2, A3 also meets (assembly) signal input part (V in modular circuit I), anti-phase (-) input of operational amplifier A 2, A3 is provided with end (V as the upper limit of modular circuit respectively H) and lower limit end (V is set L), anti-phase (-) input of operational amplifier A 1 is provided with end (V as the lowest limit d), the lowest limit (V d) reference potential is that dividing point by semistor Ptc or fixed value resistance series resistance R1 provides, resistance R 1 other end connects positive source (V +), the semistor Ptc or the fixed value resistance other end connect power cathode (V -); The output of operational amplifier A 1 connects diode D1 negative pole, and the guarantor of anodal anti-phase (-) input and the modular circuit with operational amplifier A 4 of diode D1 is apparent/and reseting port BER links to each other; The output of operational amplifier A 2, A3, A4 connects resistance R 2, R3, R4 respectively, and positive (+) input of the other end of resistance R 2, R3, R4 and operational amplifier A 4 also connects (assembly) in circuit node V f, resistance R 5Be serially connected with circuit node V fAnd positive source (V +) between, resistance R 6Be serially connected with the output of triode T1 base stage and operational amplifier A 4; Triode T1 collector electrode is as the capacitor discharge end (DIS) of modular circuit, and the output of operational amplifier A 4 is as the control output end (V of modular circuit ZO) be connected with load driving circuits.
The outer application circuit of module is made up of discrete electronic devices and components such as the outer negative tempperature coefficient thermistor Ntc of frame of broken lines among Fig. 1 and resistance R 7~R16, diode D2, triode T2, LED, relay J.Resistance R 11, R12, R13 series connection dividing potential drop are provided with upper limit V HWith lower limit V LCurrent potential; The dividing point of negative tempperature coefficient thermistor Ntc series resistance R14 is signal input part (V I) signal potential of variations in temperature is provided; Resistance R 15 is serially connected with signal input part (V I) and protect between apparent/reseting port (BER); Resistance R 16 is parallelly connected with LED; The LED negative pole connects to protect and shows/reseting port BER, the anodal serial connection dividing point that connects resistance R 7, R8 of LED, and resistance R 7 other ends connect positive source (V +), the other end of resistance R 8 connects power cathode (V -); Resistance R 9, R10 link block circuit control output (V ZO), resistance R 9 other ends connect positive source (V +), resistance R 10 other ends connect triode T2 base stage, and triode T2 emitter connects positive source (V +), triode T2 collector connection relay J coil and diode D2 negative pole, the anodal and relay J coil other end ground connection (GND) of diode D2, relay J normally opened contact control electrothermal load power supply.
Fig. 1 circuit (first kind of three-limit time-base circuit) operation principle:
When low temperature,, make signal input part (V because negative tempperature coefficient thermistor Ntc resistance is bigger I) current potential be lower than lower limit be provided with the end V LCurrent potential (V I<V L), lower limit comparator A3 output low level L, and this moment, upper limit comparator A2 output is in low level L state already, and anti-phase (-) the input current potential of Schmidt circuit A4 is greater than its positive (+) input current potential, thereby the output (V of Schmidt circuit A4 ZO) output low level L, through resistance R 4 feedbacks, make positive (+) the input Vf current potential decline of Schmidt circuit A4 be about 1/3V +Or 1/4V +Below, control output end V ZOBe low level L, can directly drive little load (R9) or promote triode T2 conducting, make relay J get electric adhesive, give large power, electrically heat load energising heat temperature raising through resistance R 10.After the intensification, negative tempperature coefficient thermistor Ntc resistance diminishes gradually, makes signal input part V ICurrent potential rises, and works as V I>V LThe time, lower limit comparator A3 output high level H makes V fThe point current potential rises to 1/2V +, but positive (+) the input current potential of Schmidt circuit A4 still is lower than its anti-phase (-) input current potential, so the control output end V of Schmidt circuit A4 ZOStill maintain low level L state, the adhesive of relay J normally opened contact, load continue the energising heat temperature raising.When temperature rises, make signal input part V ICurrent potential is higher than the upper limit end V is set HCurrent potential, upper limit comparator A2 output high potential H, at this moment, V fCurrent potential rises to anti-phase (-) the input current potential greater than Schmidt circuit A4, makes Schmidt circuit A4 output state by V ZO=L state triggers upset and is V ZO=H state through resistance R 4 positive feedbacks, makes V fThe point current potential rises to near V again +Current potential, control output end V ZO=H state ends triode T2, and the relay J coil blackout discharges (back-emf of J coil disappears through D2), makes the load outage stop heating.Simultaneously, V ZO=H drives triode T1 conductings through resistance R 6, and triode T1 collector electrode (DIS port) is for other circuit provides low level, or the Electrical Discharge Machine meeting is provided for electric capacity.
After treating that temperature reduces, V I<V H, upper limit comparator A2 output recovers electronegative potential L, V again fThe point current potential still is higher than the anti-phase (-) of Schmidt circuit A4 and goes into terminal potential, and Schmidt circuit A4 continues to maintain V ZO=H state has only equitemperature to continue to be reduced to V I<V LThe time, V fThe point current potential is lower than the anti-phase (-) of Schmidt circuit A4 and goes into terminal potential, and the output state flip of Schmidt circuit A4 is V ZO=L state drives the T2 conducting once more, and relay J adhesive, load electric heating again heat up, and carry out next duty cycle, and the temperature stabilization that makes heating is in certain scope.The normal operating conditions of this master control receives lowest limit comparator A1 monitoring at any time.
When input circuit breaks down (like thermistor Ntc broken string or shorted to earth), input current potential V IExtremely low (V I<Vd), lowest limit comparator A1 exports electronegative potential, through the luminous demonstration fault of the direct driving LED of diode D1, simultaneously, also directly triggers anti-phase () input of Schmidt circuit A4, owing to protect apparent/reseting port BER current potential less than V fThe point current potential makes Schmidt circuit A4 be in reset mode (control output end V ZOOutput high level H), triode T2 is ended, relay J discharges (reverse potential is eliminated through diode D2) and cuts off load power source, stops heating, guarantees safety.
Resistance R 15 is positive feedback resistors of lowest limit comparator A1; When lowest limit comparator A1 output high level; Thermistor Ntc low temperature high resistant undesirable feature can be improved, when lowest limit comparator A1 output low level, the threshold oscillation phenomenon that lowest limit comparator A1 produces can be eliminated when the protection action.
(2) second kinds of technical schemes are exactly second kind of three-limit time-base circuit; Also be the embodiment 2 that is applied to the easy temperature-adjusting circuit of tube, as shown in Figure 2, the interior circuit of frame of broken lines is the core circuit in the module among the figure; The frame of broken lines external circuit is the outer application circuit of module; The inside and outside circuit connection interface of frame of broken lines boundary is exactly the leading foot of core circuit module, and pin symbol, pin name are following:
Module inner core circuit; Constitute by four simulation integrated voltage comparator B1~B4 and semistor Ptc in the frame of broken lines among Fig. 2 or fixed value resistance, resistance R 1, R6, R8; Voltage comparator B 1 is as lowest limit comparator; Voltage comparator B 2 is as upper limit comparator, and voltage comparator B 3 is as the lower limit comparator, and voltage comparator B 4 is as Schmidt trigger; Anti-phase (-) input of positive (+) input of voltage comparator B 1 and voltage comparator B 2, B3 also meets (assembly) signal input part (V in modular circuit I), positive (+) input of voltage comparator B 2 is provided with end (V as the upper limit of modular circuit H), positive (+) input of voltage comparator B 3 is provided with end (V as the lower limit of modular circuit L), anti-phase (-) input of voltage comparator B 1 is provided with end (V as the lowest limit d), the lowest limit (V d) reference potential is that dividing point by fixed value resistance or semistor Ptc or fixed value resistance series resistance R1 provides, resistance R 1 other end connects positive source (V +), the semistor Ptc or the fixed value resistance other end connect power cathode (V -); Be serially connected with resistance R 6 between the output of voltage comparator B 1, B2; Be serially connected with resistance R 8 between the output of voltage comparator B 2, B3; The output of voltage comparator B 1 also directly shows with the guarantor of modular circuit/and reseting port BER is connected, and the output of voltage comparator B 2 (Vm) is and directly be connected with anti-phase (-) input of voltage comparator B 4; Positive (+) input of voltage comparator B 4 is as the preferential control input end (FK) of modular circuit, and the output of voltage comparator B 4 is as the control output end (V of modular circuit ZO) be connected with load driving circuits.
The outer application circuit of module, the discrete electronic devices and components such as negative tempperature coefficient thermistor Ntc, resistance R 2~R5, R7, R9~R16 and diode D, LED, triode T1, T2 and relay J outer by frame of broken lines among Fig. 2 constitute.Resistance R 11, R12, R13 series connection dividing potential drop are provided with upper limit V HWith lower limit V LCurrent potential; The dividing point of negative tempperature coefficient thermistor Ntc series resistance R14 is signal input part (V I) signal potential of variations in temperature is provided; Resistance R 15 is serially connected with signal input part (V I) and protect between apparent/reseting port (BER), resistance R 16 is parallelly connected with LED, and the LED negative pole connects to protect and shows/reseting port BER, the anodal connection of LED resistance R 7, resistance R 7 other ends connect positive source (V +); The also preferential control input end (FK) of contact link block circuit of resistance R 2, R3, R4, resistance R 2 other ends connect positive source (V +), resistance R 3 other ends connect power cathode (V -), resistance R 4 other end link block circuit control output (V ZO); Resistance R 5 is serially connected with the control output end (V of triode T1 base stage and modular circuit ZO) between, triode T1 emitter meets power cathode (V -), triode T1 collector electrode is as capacitor discharge end (DIS) or other circuit control end; Resistance R 9, R10 link block circuit control output (V ZO), resistance R 9 other ends connect positive source (V +), resistance R 10 other ends connect triode T2 base stage, and triode T2 emitter connects positive source (V +), triode T2 collector connection relay J coil and diode D negative pole, the anodal and relay J coil other end ground connection (GND) of diode D, relay J normally opened contact control electrothermal load power supply.
Fig. 2 circuit (second kind of three-limit time-base circuit) operation principle:
When low temperature,, make signal input part (V because negative tempperature coefficient thermistor Ntc resistance is bigger I) current potential is lower than lower limit current potential V L, i.e. V I<V L, lower limit comparator B3 output high level H, and this moment, upper limit comparator B2 output (Vm) is in high potential H state already, and the anti-phase (-) of voltage comparator B 4 is gone into terminal potential and is higher than its positive (+) and goes into terminal potential, makes voltage comparator B 4 output (V ZO) output electronegative potential L, preferential control input end (FK) current potential is also reduced to 1/3V thereupon +About, V ZO=L can directly drive low-power load R 9, or by resistance R 10 promotion triode T2 conductings, the relay J coil gets electric adhesive, and to high power load energising heat temperature raising, after the intensification, thermistor Ntc resistance tails off V ICurrent potential rises, and works as V I>V LThe time, voltage comparator B 3 output low level L make Vm point current potential +A little less than 1/2 place of protecting apparent/reseting port BER current potential, but still greater than preferential control input end FK current potential (about 1/3V +), make voltage comparator B 4 outputs continue to maintain electronegative potential L state, triode T2 continues conducting, and relay J continues to load energising heat temperature raising.When rising, temperature makes signal input part V ICurrent potential is higher than upper limit V HDuring current potential, i.e. V I>V H, voltage comparator B 2 output low level L (less than the FK current potential) directly trigger the upset of Schmidt trigger B4 operating state, control output end (V ZO) output high level H, triode T2 is ended, relay J discharges (reverse potential is eliminated by D), and the switching off load power supply stops heating.Simultaneously, control output end V ZOHigh level H also make preferential control input end FK current potential rise to (about 2/3V +), also making triode T1 conducting, triode T1 collector electrode (discharge end DIS) output low level L lets capacitor discharge.
After treating that the electrothermal load temperature slightly reduces, V I<V H, voltage comparator B 2 outputs recover original current potential (5/6V again +1/2 place), compare 1/2V +Lower slightly, but than positive (+) input FK current potential (about 2/3V of voltage comparator B 4 +) low, make voltage comparator B 4 output (V ZO) continuing to keep high level H state, load continues the cooling that has a power failure, and thermistor Ntc resistance continues to increase signal input part V ICurrent potential continues to descend, and works as V I<V LThe time, voltage comparator B 3 output high level H, Vm point current potential is lifted near protecting and shows/reseting port BER current potential (because of voltage comparator B 4 input impedance are very big, the pressure drop on the resistance R 6 is very little), goes into the current potential (2/3V of end greater than voltage comparator B 4 positives (+) +), the upset of trigger voltage comparator B4 operating state is V by the reset mode upset ZO=L state is because the feedback effect of resistance R 4 is reduced to 1/3V with the FK current potential +, control output end (V ZO) the low level L of output, making triode T2 conducting, relay J adhesive, the load heating of switching on again gets into next duty cycle, and the temperature stabilization that makes heating is in certain scope.This normal condition of master control receives auxiliary monitoring at any time.
When input circuit breaks down (like thermistor Ntc broken string or resistance R 14 short circuits), input current potential V IExtremely low, i.e. V I<V d, lowest limit comparator B1 output electronegative potential L directly shows/the luminous demonstration fault of reseting port BER driven for emitting lights diode (LED) (resistance R by protecting 7Be to limit glow current, resistance R 16 is for the BER port 5/6V to be provided +The path that operating voltage and reset level are required).Simultaneously, the electronegative potential L of voltage comparator B 1 output also makes anti-phase (-) input (V of voltage comparator B 4 through series resistance R6 mCurrent potential reduction point) (because voltage comparator B 4 input impedance are high, so the pressure drop on the resistance R 6 is minimum, V mThe point electronegative potential approaches the electronegative potential L of voltage comparator B 1 output), V mThe point electronegative potential triggers Schmidt circuit B4 upset and is reset mode (control output end V ZOOutput high level H), triode T2 is ended, relay J discharges (its reverse potential is eliminated by D), cuts off load power source, stops heating, guarantees safety.
Resistance R 15 is positive feedback resistors of voltage comparator B 1; When voltage comparator B 1 output high level; Thermistor Ntc low temperature high resistant undesirable feature can be improved, when voltage comparator B 1 output low level L, the threshold oscillation phenomenon of voltage comparator B 1 when the protection action can be eliminated.

Claims (2)

1. three-limit time-base circuit; It is characterized in that: by four simulation integrated operational amplifier A1~A4 and semistor Ptc, fixed value resistance R1~R6, diode D1, triode T1 composition module core circuit; Operational amplifier A 1 is as lowest limit comparator; Operational amplifier A 2 is as upper limit comparator, and operational amplifier A 3 is as the lower limit comparator, and operational amplifier A 4 is as Schmidt trigger; Positive (+) input of operational amplifier A 1, A2, A3 is attempted by the signal input part (V of module core circuit I), anti-phase (-) input of operational amplifier A 2, A3 is provided with end (V as the upper limit of module core circuit respectively H) and lower limit end (V is set L), anti-phase (-) input of operational amplifier A 1 is provided with end (V as the lowest limit d), the lowest limit is provided with end (V d) reference potential be that dividing point by semistor Ptc or fixed value resistance R1 provides, the end of fixed value resistance R1 connects positive source (V +), the other end of fixed value resistance R1 connects the end of semistor Ptc, and the other end of semistor Ptc connects power cathode (V -); The output of operational amplifier A 1 connects diode D1 negative pole, and the guarantor of anodal anti-phase (-) input and the module core circuit with operational amplifier A 4 of diode D1 is apparent/and reseting port BER links to each other; The output of operational amplifier A 2, A3, A4 connects the end of resistance R 2, R3, R4 respectively, and positive (+) input of the other end of resistance R 2, R3, R4 and operational amplifier A 4 is connected to circuit node V f, resistance R 5Be serially connected with circuit node V fAnd positive source (V +) between, resistance R 6Be serially connected with between the output of triode T1 base stage and operational amplifier A 4; The collector electrode of triode T1 is as the discharge end (DIS) of module core circuit, and the output of operational amplifier A 4 is connected with load driving circuits as the control output end (Vzo) of module core circuit.
2. three-limit time-base circuit; It is characterized in that: by four simulations integrated voltage comparator B1~B4 and semistor Ptc, fixed value resistance R1, R6, R8 composition module core circuit; Voltage comparator B 1 is as lowest limit comparator; Voltage comparator B 2 is as upper limit comparator, and voltage comparator B 3 is as the lower limit comparator, and voltage comparator B 4 is as Schmidt trigger; Anti-phase (-) input of positive (+) input of voltage comparator B 1 and voltage comparator B 2, B3 is attempted by the signal input part (V of module core circuit I), positive (+) input of voltage comparator B 2 is provided with end (V as the upper limit of module core circuit H), positive (+) input of voltage comparator B 3 is provided with end (V as the lower limit of module core circuit L), anti-phase (-) input of voltage comparator B 1 is provided with end (V as the lowest limit d), the lowest limit is provided with end (V d) reference potential be that dividing point by semistor Ptc series connection fixed value resistance R1 provides, the end of fixed value resistance R1 connects positive source (V +), the other end of fixed value resistance R1 connects the end of semistor Ptc, and the other end of semistor Ptc connects power cathode (V -); Be serially connected with resistance R 6 between the output of voltage comparator B 1, B2; Be serially connected with resistance R 8 between the output of voltage comparator B 2, B3; The output of voltage comparator B 1 also directly shows with the guarantor of module core circuit/and reseting port BER is connected, and the output of voltage comparator B 2 (Vm) is and directly be connected with anti-phase (-) input of voltage comparator B 4; Positive (+) input of voltage comparator B 4 is as the preferential control input end (FK) of module core circuit, and the output of voltage comparator B 4 is connected with load driving circuits as the control output end (Vzo) of module core circuit.
CN2008100489421A 2008-08-22 2008-08-22 Three-limit time-base circuit Expired - Fee Related CN101656527B (en)

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Publication number Priority date Publication date Assignee Title
CN103338034A (en) * 2013-06-15 2013-10-02 刘圣平 Novel method for arranging ports of bottom anti-control time-base circuit

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Publication number Priority date Publication date Assignee Title
CN102111137B (en) * 2010-04-09 2013-06-05 刘圣平 Safe control time-base circuit
CN102157917A (en) * 2010-06-01 2011-08-17 刘圣平 Lower-than-lower-limit reverse control time base circuit
CN104101365B (en) * 2014-07-09 2016-04-06 江西省智成测控技术研究所有限责任公司 A kind of hysteresis logic realization method that return difference is adjustable and implement device

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CN87204357U (en) * 1987-06-20 1988-06-29 曾艳林 Four-function integrated circuit automatic protector for refrigerator
CN1776985A (en) * 2005-12-08 2006-05-24 谭启仁 Shock proof wall detecting chip for current-type detecting interface with time base circuit zero earth wire

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CN87204357U (en) * 1987-06-20 1988-06-29 曾艳林 Four-function integrated circuit automatic protector for refrigerator
CN1776985A (en) * 2005-12-08 2006-05-24 谭启仁 Shock proof wall detecting chip for current-type detecting interface with time base circuit zero earth wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103338034A (en) * 2013-06-15 2013-10-02 刘圣平 Novel method for arranging ports of bottom anti-control time-base circuit

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