CN203561078U - Water bath tank heating control circuit - Google Patents
Water bath tank heating control circuit Download PDFInfo
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- CN203561078U CN203561078U CN201320676648.1U CN201320676648U CN203561078U CN 203561078 U CN203561078 U CN 203561078U CN 201320676648 U CN201320676648 U CN 201320676648U CN 203561078 U CN203561078 U CN 203561078U
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Abstract
The utility model relates to a water bath tank heating control circuit which comprises a voltage stabilizing circuit, wherein the output end of the voltage stabilizing circuit is respectively connected with the input ends of a PWM (Pulse-Width Modulation) driving circuit, a subtraction circuit and a reference voltage circuit; the output ends of the reference voltage circuit and a low voltage giving circuit are both connected with the input end of the subtraction circuit; the output end of the subtraction circuit is connected with the input end of the PWM driving circuit; the output end of the PWM driving circuit is connected with the input end of a bidirectional triode thyristor output circuit. The water bath tank heating control circuit is applied to a power adjustable control circuit of an electric heating disc inside a water bath tank; the input end of the electric heating disc inside the water bath tank is connected with the output end of a bidirectional triode thyristor Q1. The voltage output from the bidirectional triode thyristor Q1 is controlled according to the change of external input voltage, and the alternative current energy of a power grid is adjusted to output variable power through the bidirectional triode thyristor Q1, so that the heating amount of thermal fuse in the heating disc is adjusted, and the heat can be effectively conducted to the water in the water bath tank.
Description
Technical field
The utility model relates to a kind of water bath heating control circuit.
Background technology
Water bath provides a heat cold controlled for user, and temperature is constant field source evenly, and the product of test specimen or production is carried out to steady temperature test or test, also can be used as thermal source or the low-temperature receiver of direct heating or refrigeration and auxiliary heating or refrigeration.At present, for the power drive control circuit of electrical heating wire in water bath, its output voltage cannot change along with the variation of input voltage, cannot automatically adjust output.
Utility model content
The purpose of this utility model is to provide the water bath heating control circuit that a kind of stability is strong, safe, can automatically adjust with input voltage variation output.
For achieving the above object, the utility model has adopted following technical scheme: a kind of water bath heating control circuit, comprise mu balanced circuit, its output is connected with the input of PWM drive circuit, subtraction circuit and reference voltage circuit respectively, the output of reference voltage circuit, low-voltage given circuit is all connected with the input of subtraction circuit, the output of subtraction circuit is connected with the input of PWM drive circuit, and the output of PWM drive circuit is connected with the input of bidirectional triode thyristor output circuit.
Described PWM drive circuit is comprised of zero cross detection circuit, voltage comparator circuit and triangle wave generating circuit, the output of zero cross detection circuit is connected with the input of triangle wave generating circuit, the output of described mu balanced circuit is connected with the input of voltage comparator circuit, triangle wave generating circuit respectively, the output of triangle wave generating circuit, subtraction circuit is all connected with the input of voltage comparator circuit, and the output of voltage comparator circuit is connected with the input of bidirectional triode thyristor output circuit.
Described bidirectional triode thyristor output circuit is comprised of power supply circuits, control circuit, output circuit and holding circuit; power supply circuits are powered to control circuit; the output of control circuit, holding circuit is all connected with the input of output circuit, and the output of described voltage comparator circuit is connected with the input of control circuit.
Described mu balanced circuit comprises the first three terminal regulator chip 7809, the 2nd pin of its input termination bridge silicon B3, its output termination power VCC, its earth terminal ground connection and being connected with one end of capacitor C 6, the 2nd pin of another termination bridge silicon B3 of capacitor C 6, the 2nd pin of bridge silicon B3 connects the normal phase input end of amplifier U3D by capacitor C 6, electrochemical capacitor C7 is attempted by capacitor C 6, the inverting input of amplifier U3D is connected with its output, the output of amplifier U3D is connected with the earth terminal of the first three terminal regulator chip 7809 by resistance R 10, electrochemical capacitor C8, after capacitor C 9 parallel connections, be connected across between the output and ground of the first three terminal regulator chip 7809, the 1st of bridge silicon B3, 3 pins are connected with the two ends of the first secondary coil N2 of transformer T1.
Described low-voltage given circuit comprises resistance R 19, and resistance R 19 is in parallel with capacitor C 11, and capacitor C 11 is connected across between the 1st, 2 pins of chip J2; Described reference voltage circuit comprises resistance R 14, and one end of resistance R 14 is connected with resistance R 19, and the other end of resistance R 14 is connected with one end of potentiometer W1; Described subtraction circuit comprises amplifier U3A, and its normal phase input end is connected with the other end of potentiometer W1, and meets power supply VCC by resistance R 17, and its inverting input is connected with resistance R 19 by resistance R 16, and is connected with its output by resistance R 13.
Described zero cross detection circuit comprises resistance R 3, R4, one end of resistance R 3, R4 connects respectively the two ends of the primary coil N1 of transformer T1, the 3rd pin of another termination bridge silicon B2 of resistance R 3, the 1st pin of another termination bridge silicon B2 of resistance R 4, the 2nd pin of bridge silicon B2 is connected with the 1st pin of optocoupler U4 by resistance R 5, the 4th pin of bridge silicon B2 is connected with the 2nd pin of optocoupler U4, and the 3rd pin of optocoupler U4 connects the earth terminal of the first three terminal regulator chip 7809; Described triangle wave generating circuit comprises amplifier U3C, its normal phase input end connects the 4th pin of optocoupler U4, and meet power supply VCC by resistance R 7, its inverting input meets power supply VCC by resistance R 8, its output connects the base stage of triode Q3 by resistance R 12, the grounded emitter of triode Q3, the colelctor electrode of triode Q3 is connected with the colelctor electrode of triode Q4, the emitter stage of triode Q4 meets power supply VCC by resistance R 15, the base stage of triode Q4 is connected with the negative pole of electrochemical capacitor C10 by resistance R 18, and the positive pole of electrochemical capacitor C10 connects the colelctor electrode of triode Q4; Described voltage comparator circuit comprises amplifier U3B, and its normal phase input end connects the colelctor electrode of triode Q3, the output of its anti-phase input termination amplifier U3A.
Described power supply circuits comprise bridge silicon B1, its the 1st, 3 pin is connected with the two ends of the second subprime coil N3 of transformer T1 respectively, its the 2nd, 4 pin is connected with the two ends of capacitor C 2 respectively, capacitor C 2 is in parallel with electrochemical capacitor C3, and electrochemical capacitor C3 is connected across between the output and ground of the second three terminal regulator chip 7809; Described control circuit comprises triode Q2, its base stage is connected with the 3rd pin of optocoupler U5 by resistance R 6, the 2nd pin ground connection of optocoupler U5, the 1st pin of optocoupler U5 connects the output of amplifier U3B by resistance R 11, and the colelctor electrode of triode Q2 is connected with the 4th pin of optocoupler U5; Described holding circuit comprises capacitor C 1, and capacitor C 1 is connected with resistance R 1; Described output circuit comprises bidirectional triode thyristor Q1, the emitter stage of triode Q2 connects the control utmost point of bidirectional triode thyristor Q1 by resistance R 2, a termination capacitor C 1 of bidirectional triode thyristor Q1, other end connecting resistance R1, the two ends of bidirectional triode thyristor Q1 connect the input of electric heating plate by the 1st, 2 pins of connector J1.
As shown from the above technical solution, the utility model is for the capable of regulating power control circuit of the electric heating plate in water bath, the output of electric heating plate input termination bidirectional triode thyristor Q1 in water bath, by the variation of extraneous input voltage, control the voltage swing of bidirectional triode thyristor Q1 output, adjust the AC energy of electrical network by bidirectional triode thyristor Q1 output variable power, thereby adjust the caloric value of heating wire in heating plate, and the water in water bath is carried out to transferring heat effectively.The utility model stability is strong, safe, can automatically adjust with the variation of input voltage output, can, according to the voltage swing of controller output, adjust the power output of bidirectional triode thyristor Q1.
Accompanying drawing explanation
Fig. 1,2 is respectively circuit block diagram of the present utility model, circuit theory diagrams.
The specific embodiment
A kind of water bath heating control circuit, comprise mu balanced circuit 1, its output is connected with PWM drive circuit 5, subtraction circuit 4 and the input of reference voltage circuit 3 respectively, the output of reference voltage circuit 3, low-voltage given circuit 2 is all connected with the input of subtraction circuit 4, the output of subtraction circuit 4 is connected with the input of PWM drive circuit 5, and the output of PWM drive circuit 5 is connected with the input of bidirectional triode thyristor output circuit 6.Described PWM drive circuit 5 is comprised of zero cross detection circuit 5a, voltage comparator circuit 5c and triangle wave generating circuit 5b, the output of zero cross detection circuit 5a is connected with the input of triangle wave generating circuit 5b, the output of described mu balanced circuit 1 is connected with the input of voltage comparator circuit 5c, triangle wave generating circuit 5b respectively, the output of triangle wave generating circuit 5b, subtraction circuit 4 is all connected with the input of voltage comparator circuit 5c, and the output of voltage comparator circuit 5c is connected with the input of bidirectional triode thyristor output circuit 6.Described bidirectional triode thyristor output circuit 6 is comprised of power supply circuits 6a, control circuit 6b, output circuit 6c and holding circuit 6d; power supply circuits 6a powers to control circuit 6b; the output of control circuit 6b, holding circuit 6d is all connected with the input of output circuit 6c, and the output of described voltage comparator circuit 5c is connected with the input of control circuit 6b.As shown in Figure 1.
As shown in Figure 2, described mu balanced circuit 1 comprises the first three terminal regulator chip 7809, the 2nd pin of its input termination bridge silicon B3, its output termination power VCC, its earth terminal ground connection and being connected with one end of capacitor C 6, the 2nd pin of another termination bridge silicon B3 of capacitor C 6, the 2nd pin of bridge silicon B3 connects the normal phase input end of amplifier U3D by capacitor C 6, electrochemical capacitor C7 is attempted by capacitor C 6, the inverting input of amplifier U3D is connected with its output, the output of amplifier U3D is connected with the earth terminal of the first three terminal regulator chip 7809 by resistance R 10, electrochemical capacitor C8, after capacitor C 9 parallel connections, be connected across between the output and ground of the first three terminal regulator chip 7809, the 1st of bridge silicon B3, 3 pins are connected with the two ends of the first secondary coil N2 of transformer T1.Alternating current 220V in electrical network becomes interchange low-voltage by transformer T1, through bridge silicon B3, be transformed into Rectified alternating current, through filter capacitor C6, C7, become smooth direct current, through the first three terminal regulator chip 7809, become required galvanic current again, then, for reference voltage circuit 3 and amplifier integrated circuit provide operating current.By luminous tube D1, resistance R 18, form power supply indication, when mu balanced circuit 1 is normal, luminous tube D1 lights.
As shown in Figure 2, described low-voltage given circuit 2 comprises resistance R 19, and resistance R 19 is in parallel with capacitor C 11, and capacitor C 11 is connected across between the 1st, 2 pins of chip J2; Described reference voltage circuit 3 comprises resistance R 14, and one end of resistance R 14 is connected with resistance R 19, and the other end of resistance R 14 is connected with one end of potentiometer W1; Described subtraction circuit 4 comprises amplifier U3A, and its normal phase input end is connected with the other end of potentiometer W1, and meets power supply VCC by resistance R 17, and its inverting input is connected with resistance R 19 by resistance R 16, and is connected with its output by resistance R 13.Low-voltage given circuit 2 sends 0～10V adjustable voltage by controller, through resistance R 19, capacitor C 11, composes in parallel anti-jamming circuit, as the input signal Ui in subtraction circuit 4.Reference voltage circuit 3 is composed in series by resistance R 17, R14, potentiometer W1, by regulator potentiometer W1, obtain reference voltage Uref, be connected to the normal phase input end of amplifier U3A in subtraction circuit 4, the output voltage of subtraction circuit 4 is: Uo=2Uref-Ui (V), and as shown in indicating in Fig. 2.
As shown in Figure 2, described zero cross detection circuit 5a comprises resistance R 3, R4, one end of resistance R 3, R4 connects respectively the two ends of the primary coil N1 of transformer T1, the 3rd pin of another termination bridge silicon B2 of resistance R 3, the 1st pin of another termination bridge silicon B2 of resistance R 4, the 2nd pin of bridge silicon B2 is connected with the 1st pin of optocoupler U4 by resistance R 5, the 4th pin of bridge silicon B2 is connected with the 2nd pin of optocoupler U4, and the 3rd pin of optocoupler U4 connects the earth terminal of the first three terminal regulator chip 7809; Described triangle wave generating circuit 5b comprises amplifier U3C, its normal phase input end connects the 4th pin of optocoupler U4, and meet power supply VCC by resistance R 7, its inverting input meets power supply VCC by resistance R 8, its output connects the base stage of triode Q3 by resistance R 12, the grounded emitter of triode Q3, the colelctor electrode of triode Q3 is connected with the colelctor electrode of triode Q4, the emitter stage of triode Q4 meets power supply VCC by resistance R 15, the base stage of triode Q4 is connected with the negative pole of electrochemical capacitor C10 by resistance R 18, and the positive pole of electrochemical capacitor C10 connects the colelctor electrode of triode Q4; Described voltage comparator circuit 5c comprises amplifier U3B, and its normal phase input end connects the colelctor electrode of triode Q3, the output of its anti-phase input termination amplifier U3A.
Zero cross detection circuit 5a is by resistance R 3, R4 step-down, bridge silicon B2 rectification, the normal phase input end that obtains one and the synchronous pulsating direct current of network source and enter amplifier U3C through optocoupler U4 isolation, outputs to triangle wave generating circuit 5b, controls triangular wave frequency and synchronizes with network source.Triangle wave generating circuit 5b forms charge and discharge circuit by resistance R 12, R15, R18, capacitor C 10, triode Q3, Q4, same network source of charge and discharge cycle, and output signal connects the normal phase input end of amplifier U3B in voltage comparator circuit 5c.Voltage comparator circuit 5c consists of amplifier U3B, and output is impulse wave, and pulse wave frequency is consistent with triangular wave, and the width of impulse wave is by the decision of subtraction circuit output signal size, and optocoupler U5 plays the effect of separation net power supply.
As shown in Figure 2, described power supply circuits 6a comprises bridge silicon B1, its the 1st, 3 pin is connected with the two ends of the second subprime coil N3 of transformer T1 respectively, its the 2nd, 4 pin is connected with the two ends of capacitor C 2 respectively, capacitor C 2 is in parallel with electrochemical capacitor C3, and electrochemical capacitor C3 is connected across between the output and ground of the second three terminal regulator chip 7809; Described control circuit 6b comprises triode Q2, its base stage is connected with the 3rd pin of optocoupler U5 by resistance R 6, the 2nd pin ground connection of optocoupler U5, the 1st pin of optocoupler U5 connects the output of amplifier U3B by resistance R 11, and the colelctor electrode of triode Q2 is connected with the 4th pin of optocoupler U5; Described holding circuit 6d comprises capacitor C 1, and capacitor C 1 is connected with resistance R 1; Described output circuit 6c comprises bidirectional triode thyristor Q1, the emitter stage of triode Q2 connects the control utmost point of bidirectional triode thyristor Q1 by resistance R 2, a termination capacitor C 1 of bidirectional triode thyristor Q1, other end connecting resistance R1, the two ends of bidirectional triode thyristor Q1 connect the input of electric heating plate by the 1st, 2 pins of connector J1.Control signal, through optocoupler U5 isolation, drives triode Q2, controls the switching of bidirectional triode thyristor Q1.By output bidirectional triode thyristor, Q1 obtains 0 to 200V alternating current, and electric heating plate in water receiving bath, realizes electrodeless power regulating.After resistance R 1, capacitor C 1 series connection, be connected to bidirectional triode thyristor Q1 input, output two ends, composition resistance capaciting absorpting circuit, prevents high-voltage breakdown bidirectional triode thyristor Q1, plays protection bidirectional triode thyristor Q1 effect.
The utility model is for the capable of regulating power control circuit of the electric heating plate in water bath, the output of electric heating plate input termination bidirectional triode thyristor Q1 in water bath, by the variation of extraneous input voltage, control the voltage swing of bidirectional triode thyristor Q1 output, adjust the AC energy of electrical network by bidirectional triode thyristor Q1 output variable power, thereby the caloric value of heating wire in adjustment heating plate, and the water in water bath is carried out to transferring heat effectively.The utility model stability is strong, safe, can automatically adjust with the variation of input voltage output, can, according to the voltage swing of controller output, adjust the power output of bidirectional triode thyristor Q1.
Claims (7)
1. a water bath heating control circuit, it is characterized in that: comprise mu balanced circuit (1), its output is connected with PWM drive circuit (5), subtraction circuit (4) and the input of reference voltage circuit (3) respectively, the output of reference voltage circuit (3), low-voltage given circuit (2) is all connected with the input of subtraction circuit (4), the output of subtraction circuit (4) is connected with the input of PWM drive circuit (5), and the output of PWM drive circuit (5) is connected with the input of bidirectional triode thyristor output circuit (6).
2. water bath heating control circuit according to claim 1, it is characterized in that: described PWM drive circuit (5) is by zero cross detection circuit (5a), voltage comparator circuit (5c) and triangle wave generating circuit (5b) composition, the output of zero cross detection circuit (5a) is connected with the input of triangle wave generating circuit (5b), the output of described mu balanced circuit (1) respectively with voltage comparator circuit (5c), the input of triangle wave generating circuit (5b) is connected, triangle wave generating circuit (5b), the output of subtraction circuit (4) is all connected with the input of voltage comparator circuit (5c), the output of voltage comparator circuit (5c) is connected with the input of bidirectional triode thyristor output circuit (6).
3. water bath heating control circuit according to claim 2; it is characterized in that: described bidirectional triode thyristor output circuit (6) is comprised of power supply circuits (6a), control circuit (6b), output circuit (6c) and holding circuit (6d); power supply circuits (6a) are powered to control circuit (6b); the output of control circuit (6b), holding circuit (6d) is all connected with the input of output circuit (6c), and the output of described voltage comparator circuit (5c) is connected with the input of control circuit (6b).
4. water bath heating control circuit according to claim 3, it is characterized in that: described mu balanced circuit (1) comprises the first three terminal regulator chip 7809, the 2nd pin of its input termination bridge silicon B3, its output termination power VCC, its earth terminal ground connection and being connected with one end of capacitor C 6, the 2nd pin of another termination bridge silicon B3 of capacitor C 6, the 2nd pin of bridge silicon B3 connects the normal phase input end of amplifier U3D by capacitor C 6, electrochemical capacitor C7 is attempted by capacitor C 6, the inverting input of amplifier U3D is connected with its output, the output of amplifier U3D is connected with the earth terminal of the first three terminal regulator chip 7809 by resistance R 10, electrochemical capacitor C8, after capacitor C 9 parallel connections, be connected across between the output and ground of the first three terminal regulator chip 7809, the 1st of bridge silicon B3, 3 pins are connected with the two ends of the first secondary coil N2 of transformer T1.
5. water bath heating control circuit according to claim 4, is characterized in that: described low-voltage given circuit (2) comprises resistance R 19, and resistance R 19 is in parallel with capacitor C 11, and capacitor C 11 is connected across between the 1st, 2 pins of chip J2; Described reference voltage circuit (3) comprises resistance R 14, and one end of resistance R 14 is connected with resistance R 19, and the other end of resistance R 14 is connected with one end of potentiometer W1; Described subtraction circuit (4) comprises amplifier U3A, and its normal phase input end is connected with the other end of potentiometer W1, and meets power supply VCC by resistance R 17, and its inverting input is connected with resistance R 19 by resistance R 16, and is connected with its output by resistance R 13.
6. water bath heating control circuit according to claim 5, it is characterized in that: described zero cross detection circuit (5a) comprises resistance R 3, R4, resistance R 3, one end of R4 connects respectively the two ends of the primary coil N1 of transformer T1, the 3rd pin of another termination bridge silicon B2 of resistance R 3, the 1st pin of another termination bridge silicon B2 of resistance R 4, the 2nd pin of bridge silicon B2 is connected with the 1st pin of optocoupler U4 by resistance R 5, the 4th pin of bridge silicon B2 is connected with the 2nd pin of optocoupler U4, the 3rd pin of optocoupler U4 connects the earth terminal of the first three terminal regulator chip 7809, described triangle wave generating circuit (5b) comprises amplifier U3C, its normal phase input end connects the 4th pin of optocoupler U4, and meet power supply VCC by resistance R 7, its inverting input meets power supply VCC by resistance R 8, its output connects the base stage of triode Q3 by resistance R 12, the grounded emitter of triode Q3, the colelctor electrode of triode Q3 is connected with the colelctor electrode of triode Q4, the emitter stage of triode Q4 meets power supply VCC by resistance R 15, the base stage of triode Q4 is connected with the negative pole of electrochemical capacitor C10 by resistance R 18, and the positive pole of electrochemical capacitor C10 connects the colelctor electrode of triode Q4, described voltage comparator circuit (5c) comprises amplifier U3B, and its normal phase input end connects the colelctor electrode of triode Q3, the output of its anti-phase input termination amplifier U3A.
7. water bath heating control circuit according to claim 6, it is characterized in that: described power supply circuits (6a) comprise bridge silicon B1, its the 1st, 3 pin is connected with the two ends of the second subprime coil N3 of transformer T1 respectively, its the 2nd, 4 pin is connected with the two ends of capacitor C 2 respectively, capacitor C 2 is in parallel with electrochemical capacitor C3, and electrochemical capacitor C3 is connected across between the output and ground of the second three terminal regulator chip 7809; Described control circuit (6b) comprises triode Q2, its base stage is connected with the 3rd pin of optocoupler U5 by resistance R 6, the 2nd pin ground connection of optocoupler U5, the 1st pin of optocoupler U5 connects the output of amplifier U3B by resistance R 11, and the colelctor electrode of triode Q2 is connected with the 4th pin of optocoupler U5; Described holding circuit (6d) comprises capacitor C 1, and capacitor C 1 is connected with resistance R 1; Described output circuit (6c) comprises bidirectional triode thyristor Q1, the emitter stage of triode Q2 connects the control utmost point of bidirectional triode thyristor Q1 by resistance R 2, a termination capacitor C 1 of bidirectional triode thyristor Q1, other end connecting resistance R1, the two ends of bidirectional triode thyristor Q1 connect the input of electric heating plate by the 1st, 2 pins of connector J1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676648.1U CN203561078U (en) | 2013-10-30 | 2013-10-30 | Water bath tank heating control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676648.1U CN203561078U (en) | 2013-10-30 | 2013-10-30 | Water bath tank heating control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203561078U true CN203561078U (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320676648.1U Withdrawn - After Issue CN203561078U (en) | 2013-10-30 | 2013-10-30 | Water bath tank heating control circuit |
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| Country | Link |
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| CN (1) | CN203561078U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542536A (en) * | 2013-10-30 | 2014-01-29 | 安徽英特电子有限公司 | Water bath heating control circuit |
-
2013
- 2013-10-30 CN CN201320676648.1U patent/CN203561078U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542536A (en) * | 2013-10-30 | 2014-01-29 | 安徽英特电子有限公司 | Water bath heating control circuit |
| CN103542536B (en) * | 2013-10-30 | 2016-06-29 | 安徽英特电子有限公司 | Water bath heating control circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140423 Effective date of abandoning: 20160629 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |