CN204679874U - A kind of heating boiler level sensing display control circuit - Google Patents
A kind of heating boiler level sensing display control circuit Download PDFInfo
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- CN204679874U CN204679874U CN201520364723.XU CN201520364723U CN204679874U CN 204679874 U CN204679874 U CN 204679874U CN 201520364723 U CN201520364723 U CN 201520364723U CN 204679874 U CN204679874 U CN 204679874U
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Abstract
The utility model discloses a kind of heating boiler level sensing display control circuit, comprise the high liquid level line of induction and the middle liquid level line of induction, and oscillatory circuit, reference voltage generating circuit and relay drive circuit, one end of the high liquid level line of induction and one end of the middle liquid level line of induction all connect with the output terminal of oscillatory circuit, the other end of the high liquid level line of induction is connected to the first voltage comparator circuit, the other end of the middle liquid level line of induction is connected to the second voltage comparator circuit, the output terminal of the first voltage comparator circuit is connected to high liquid level indicator light circuit, the output terminal of the second voltage comparator circuit is connected to low liquid level indicator light circuit, middle liquid level indicator light circuit and bleeder circuit is connected between the output terminal of the first voltage comparator circuit and the output terminal of the second voltage comparator circuit, the comparative voltage input end of relay drive circuit connects with the output terminal of bleeder circuit.The utility model circuit structure is simple, and functional reliability is high, and detection accuracy is high, extends the life-span of heating boiler, avoids potential safety hazard.
Description
Technical field
The utility model belongs to Technology of Level Detection field, is specifically related to a kind of heating boiler level sensing display control circuit.
Background technology
Heating boiler liquid level protecting control plays very important effect in whole heating system, and maintaining heating boiler liquid level is the necessary condition ensureing that heating boiler normally runs within the specific limits.When heating boiler lack of water, there will be dry combustion method and burn out the phenomenon of water-cooling wall, have impact on the serviceable life of heating boiler, and there is potential safety hazard.In prior art, in order to overcome the above problems, although also use some control modes, be not only minority, and also there is limitation and hidden danger, as adopted probe, utilize water to carry out conductivity detection water level, so not only there is the pollution that electrolysis brings, probe also can be corroded, have impact on the serviceable life of probe, and reduce the reliability of water level detecting.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, a kind of heating boiler level sensing display control circuit is provided, its circuit structure is simple, and realization is convenient and cost is low, and antijamming capability is strong, functional reliability is high, the accuracy detecting liquid level is high, extends the serviceable life of heating boiler, avoids potential safety hazard, practical, be convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of heating boiler level sensing display control circuit, the water inlet of described heating boiler is connected with water source with the water pump be arranged on water inlet pipe by water inlet pipe, the relay of the current supply circuit for being switched on or switched off water pump is in series with in the current supply circuit of described water pump, it is characterized in that: described heating boiler level sensing display control circuit comprises the high liquid level line of induction stretching into heating boiler internal upper part and the middle liquid level line of induction stretching into middle part in heating boiler, and oscillatory circuit, reference voltage generating circuit and relay drive circuit, one end of the described high liquid level line of induction and one end of the middle liquid level line of induction all connect with the output terminal of oscillatory circuit, the other end of the described high liquid level line of induction is connected to the first voltage comparator circuit, the other end of the described middle liquid level line of induction is connected to the second voltage comparator circuit, the reference voltage input of described first voltage comparator circuit, the reference voltage input of the second voltage comparator circuit and the reference voltage input of relay drive circuit all connect with the output terminal of reference voltage generating circuit, the output terminal of described first voltage comparator circuit is connected to high liquid level indicator light circuit, the output terminal of described second voltage comparator circuit is connected to low liquid level indicator light circuit, middle liquid level indicator light circuit and bleeder circuit is connected between the output terminal of described first voltage comparator circuit and the output terminal of the second voltage comparator circuit, the comparative voltage input end of described relay drive circuit connects with the output terminal of bleeder circuit, described relay connects with the output terminal of relay drive circuit,
Described relay drive circuit comprises comparer U1D, triode Q1 and resistance R18, the inverting input of described comparer U1D is the comparative voltage input end of relay drive circuit, the in-phase input end of described comparer U1D connects with one end of resistance R18, the other end of described resistance R18 is the reference voltage input of relay drive circuit, resistance R19 is connected between the in-phase input end of described comparer U1D and output terminal, the base stage of described triode Q1 is connected with the output terminal of comparer U1D by resistance R21, the output terminal of the current collection of described triode Q1 very relay drive circuit, the grounded emitter of described triode Q1.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described oscillatory circuit comprises operational amplifier U1A, the in-phase input end of described operational amplifier U1A is connected with the output terminal of+5V power supply by resistance R1, and by resistance R12 ground connection, resistance R3 is connected between the in-phase input end of described operational amplifier U1A and output terminal, the inverting input of described operational amplifier U1A is by nonpolar electric capacity C1 ground connection, resistance R2 is connected between the inverting input of described operational amplifier U1A and output terminal, the output terminal of described operational amplifier U1A is the output terminal SIG of oscillatory circuit.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described reference voltage generating circuit is made up of resistance R10, resistance R11 and polar capacitor C10, one end after described resistance R10 connects with resistance R11 connects with the output terminal of+5V power supply, other end ground connection, the link of described resistance R10 and resistance R11 is the output terminal VREF of reference voltage generating circuit, and the link of described resistance R10 and resistance R11 is by polar capacitor C10 ground connection.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described relay is relay K, one end of the coil of described relay K connects with the output terminal of relay drive circuit, the other end of the coil of described relay K connects with the output terminal of+5V power supply, the common of described relay K connects with the positive source of water pump, the normally opened contact of described relay K connects with the output terminal VCC of the power supply of water pump, the normally closed contact of described relay K is unsettled, the power cathode ground connection of described water pump.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described first voltage comparator circuit comprises comparer U1B, commutation diode D1, commutation diode D2, nonpolar electric capacity C2 and resistance R5, the negative electrode of described commutation diode D1 and the anode of commutation diode D2 all connect with one end of nonpolar electric capacity C2, the other end of described nonpolar electric capacity C2 connects with the other end of the high liquid level line of induction, the negative electrode of described commutation diode D2, one end of nonpolar electric capacity C4 and one end of resistance R4 all connect with the inverting input of comparer U1B, the anode of described commutation diode D1, the other end of nonpolar electric capacity C4 and the equal ground connection of the other end of resistance R4, the in-phase input end of described comparer U1B connects with one end of resistance R5, the other end of described resistance R5 is the reference voltage input terminal of the first voltage comparator circuit, the output terminal of described comparer U1B is the output terminal of the first voltage comparator circuit, resistance R6 is connected between the in-phase input end of described comparer U1B and output terminal.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described second voltage comparator circuit comprises comparer U1C, commutation diode D4, commutation diode D5, nonpolar electric capacity C7 and resistance R14, the negative electrode of described commutation diode D4 and the anode of commutation diode D5 all connect with one end of nonpolar electric capacity C7, the other end of described nonpolar electric capacity C7 connects with the other end of the middle liquid level line of induction, the negative electrode of described commutation diode D5, one end of nonpolar electric capacity C9 and one end of resistance R13 all connect with the inverting input of comparer U1C, the anode of described commutation diode D4, the other end of nonpolar electric capacity C9 and the equal ground connection of the other end of resistance R13, the in-phase input end of described comparer U1C connects with one end of resistance R14, the other end of described resistance R14 is the reference voltage input terminal of the second voltage comparator circuit, the output terminal of described comparer U1C is the output terminal of the second voltage comparator circuit, resistance R15 is connected between the in-phase input end of described comparer U1C and output terminal.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described high liquid level indicator light circuit is made up of green LED D3 and resistance R7, the anode of described green LED D3 connects with the output terminal of+5V power supply, and the negative electrode of described green LED D3 is connected with the output terminal of the first voltage comparator circuit by resistance R7.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described low liquid level indicator light circuit is made up of red light emitting diodes D6 and resistance R17, the anode of described red light emitting diodes D6 is connected with the output terminal of the second voltage comparator circuit by resistance R17, the plus earth of described red light emitting diodes D6.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described middle liquid level indicator light circuit is made up of yellow light-emitting diode D7 and resistance R9, the anode of described yellow light-emitting diode D7 is connected with the output terminal of the first voltage comparator circuit by resistance R9, and the negative electrode of described yellow light-emitting diode D7 connects with the output terminal of the second voltage comparator circuit.
Above-mentioned a kind of heating boiler level sensing display control circuit, it is characterized in that: described bleeder circuit is made up of resistance R8 and resistance R16, one end after described resistance R8 and resistance R16 connects connects with the output terminal of the first voltage comparator circuit, the other end connects with the output terminal of the second voltage comparator circuit, and the link of described resistance R8 and resistance R16 is the output terminal VIN of bleeder circuit.
The utility model compared with prior art has the following advantages:
1, the utility model circuit structure is simple, rationally novel in design, and realization is convenient and cost is low.
2, antijamming capability of the present utility model is strong, and functional reliability is high, and the accuracy detecting liquid level is high.
3, use of the present utility model, can avoid the phenomenon occurring dry combustion method and burn out water-cooling wall, extends the serviceable life of heating boiler, and avoids potential safety hazard.
4, of the present utility model practical, result of use is good, is convenient to promote the use of.
In sum, the utility model circuit structure is simple, and realization is convenient and cost is low, and antijamming capability is strong, and functional reliability is high, and the accuracy detecting liquid level is high, extends the serviceable life of heating boiler, avoids potential safety hazard, practical, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit connection diagram of the utility model relay drive circuit, relay and water pump.
Fig. 3 is the circuit theory diagrams of the utility model oscillatory circuit.
Fig. 4 is the circuit theory diagrams of the utility model reference voltage generating circuit.
Fig. 5 is the circuit connection diagram of the utility model high liquid level line of induction, the middle liquid level line of induction, the first voltage comparator circuit, the second voltage comparator circuit, high liquid level indicator light circuit, low liquid level indicator light circuit, middle liquid level indicator light circuit and bleeder circuit.
Description of reference numerals:
1-high liquid level the line of induction; 2-middle liquid level the line of induction; 3-oscillatory circuit;
4-reference voltage generating circuit; 5-relay drive circuit; 6-the first voltage comparator circuit;
7-the second voltage comparator circuit; 8-high liquid level indicator light circuit; 9-low liquid level indicator light circuit;
10-middle liquid level indicator light circuit; 11-bleeder circuit; 12-relay;
13-water pump.
Embodiment
As shown in Figure 1, the heating boiler level sensing display control circuit that the utility model comprises, the water inlet of described heating boiler is connected with water source with the water pump 13 be arranged on water inlet pipe by water inlet pipe, the relay 12 of the current supply circuit for being switched on or switched off water pump 13 is in series with in the current supply circuit of described water pump 13, described heating boiler level sensing display control circuit comprises the high liquid level line of induction 1 stretching into heating boiler internal upper part and the middle liquid level line of induction 2 stretching into middle part in heating boiler, and oscillatory circuit 3, reference voltage generating circuit 4 and relay drive circuit 5, one end of the described high liquid level line of induction 1 and one end of the middle liquid level line of induction 2 all connect with the output terminal of oscillatory circuit 3, the other end of the described high liquid level line of induction 1 is connected to the first voltage comparator circuit 6, the other end of the described middle liquid level line of induction 2 is connected to the second voltage comparator circuit 7, the reference voltage input of described first voltage comparator circuit 6, the reference voltage input of the second voltage comparator circuit 7 and the reference voltage input of relay drive circuit 5 all connect with the output terminal of reference voltage generating circuit 4, the output terminal of described first voltage comparator circuit 6 is connected to high liquid level indicator light circuit 8, the output terminal of described second voltage comparator circuit 7 is connected to low liquid level indicator light circuit 9, middle liquid level indicator light circuit 10 and bleeder circuit 11 is connected between the output terminal of described first voltage comparator circuit 6 and the output terminal of the second voltage comparator circuit 7, the comparative voltage input end of described relay drive circuit 5 connects with the output terminal of bleeder circuit 11, described relay 12 connects with the output terminal of relay drive circuit 5, during concrete enforcement, the described high liquid level line of induction 1 and the middle liquid level line of induction 2 are formed by tinned wird.
As shown in Figure 2, described relay drive circuit 5 comprises comparer U1D, triode Q1 and resistance R18, the inverting input of described comparer U1D is the comparative voltage input end of relay drive circuit 5, the in-phase input end of described comparer U1D connects with one end of resistance R18, the other end of described resistance R18 is the reference voltage input of relay drive circuit 5, resistance R19 is connected between the in-phase input end of described comparer U1D and output terminal, the base stage of described triode Q1 is connected with the output terminal of comparer U1D by resistance R21, the output terminal of the current collection of described triode Q1 very relay drive circuit 5, the grounded emitter of described triode Q1.
As shown in Figure 3, in the present embodiment, described oscillatory circuit 3 comprises operational amplifier U1A, the in-phase input end of described operational amplifier U1A is connected with the output terminal of+5V power supply by resistance R1, and by resistance R12 ground connection, resistance R3 is connected between the in-phase input end of described operational amplifier U1A and output terminal, the inverting input of described operational amplifier U1A is by nonpolar electric capacity C1 ground connection, be connected to resistance R2 between the inverting input of described operational amplifier U1A and output terminal, the output terminal of described operational amplifier U1A is the output terminal SIG of oscillatory circuit 3.In oscillatory circuit 3, + 5V the voltage that the right+5V power supply of resistance R1 and resistance R12 exports carries out dividing potential drop, resistance R3 is positive feedback resistor, jointly for the in-phase input end of operational amplifier U1A provide reference voltage V+, the anti-phase input terminal voltage V-of operational amplifier U1A takes from by resistance R2, the two ends of electric capacity C1 in the integrating circuit that electric capacity C1 forms, V+ and V-compares the height of the output terminal SIG output voltage determining oscillatory circuit 3, because electric capacity C1 is constantly at positive and negative both direction charging and discharging, the voltage of V-is made constantly to be greater than V+ and to be less than V+, the voltage that the output terminal SIG of oscillatory circuit 3 exports also overturns between low and high level with regard to continuous, this creates the terminal required oscillator signal.
As shown in Figure 4, in the present embodiment, described reference voltage generating circuit 4 is made up of resistance R10, resistance R11 and polar capacitor C10, one end after described resistance R10 connects with resistance R11 connects with the output terminal of+5V power supply, other end ground connection, the link of described resistance R10 and resistance R11 is the output terminal VREF of reference voltage generating circuit 4, and the link of described resistance R10 and resistance R11 is by polar capacitor C10 ground connection.Described reference voltage generating circuit 4 obtains reference voltage by resistance R10 dividing potential drop of connecting with resistance R11, and polar capacitor C10 serves the effect of further stable reference voltage.
As shown in Figure 2, in the present embodiment, described relay 12 is relay K, one end of the coil of described relay K connects with the output terminal of relay drive circuit 5, the other end of the coil of described relay K connects with the output terminal of+5V power supply, and the common of described relay K connects with the positive source of water pump 13, and the normally opened contact of described relay K connects with the output terminal VCC of the power supply of water pump 13, the normally closed contact of described relay K is unsettled, the power cathode ground connection of described water pump 13.
As shown in Figure 5, in the present embodiment, described first voltage comparator circuit 6 comprises comparer U1B, commutation diode D1, commutation diode D2, nonpolar electric capacity C2 and resistance R5, the negative electrode of described commutation diode D1 and the anode of commutation diode D2 all connect with one end of nonpolar electric capacity C2, the other end of described nonpolar electric capacity C2 connects with the other end of the high liquid level line of induction 1, the negative electrode of described commutation diode D2, one end of nonpolar electric capacity C4 and one end of resistance R4 all connect with the inverting input of comparer U1B, the anode of described commutation diode D1, the other end of nonpolar electric capacity C4 and the equal ground connection of the other end of resistance R4, the in-phase input end of described comparer U1B connects with one end of resistance R5, the other end of described resistance R5 is the reference voltage input terminal of the first voltage comparator circuit 6, the output terminal of described comparer U1B is the output terminal of the first voltage comparator circuit 6, resistance R6 is connected between the in-phase input end of described comparer U1B and output terminal.In described first voltage comparator circuit 6, nonpolar electric capacity C2 is coupling capacitance, commutation diode D1 and commutation diode D2 is used for rectification, nonpolar electric capacity C4 is used for filtering, voltage after resistance R4 forms rectifying and wave-filtering is the anti-phase input terminal voltage of comparer U1B, and the in-phase input end voltage of comparer U1B is provided by reference voltage generating circuit 4; Its in-phase input end voltage and anti-phase input terminal voltage compare by comparer U1B, when in-phase input end voltage is greater than anti-phase input terminal voltage export high level, otherwise when anti-phase input terminal voltage is greater than in-phase input end voltage output low level.
As shown in Figure 5, in the present embodiment, described second voltage comparator circuit 7 comprises comparer U1C, commutation diode D4, commutation diode D5, nonpolar electric capacity C7 and resistance R14, the negative electrode of described commutation diode D4 and the anode of commutation diode D5 all connect with one end of nonpolar electric capacity C7, the other end of described nonpolar electric capacity C7 connects with the other end of the middle liquid level line of induction 2, the negative electrode of described commutation diode D5, one end of nonpolar electric capacity C9 and one end of resistance R13 all connect with the inverting input of comparer U1C, the anode of described commutation diode D4, the other end of nonpolar electric capacity C9 and the equal ground connection of the other end of resistance R13, the in-phase input end of described comparer U1C connects with one end of resistance R14, the other end of described resistance R14 is the reference voltage input terminal of the second voltage comparator circuit 7, the output terminal of described comparer U1C is the output terminal of the second voltage comparator circuit 7, resistance R15 is connected between the in-phase input end of described comparer U1C and output terminal.In described second voltage comparator circuit 7, nonpolar electric capacity C7 is coupling capacitance, commutation diode D4 and commutation diode D5 is used for rectification, nonpolar electric capacity C9 is used for filtering, voltage after resistance R13 forms rectifying and wave-filtering is the anti-phase input terminal voltage of comparer U1C, and the in-phase input end voltage of comparer U1C is provided by reference voltage generating circuit 4; Its in-phase input end voltage and anti-phase input terminal voltage compare by comparer U1C, when in-phase input end voltage is greater than anti-phase input terminal voltage export high level, otherwise when anti-phase input terminal voltage is greater than in-phase input end voltage output low level.
As shown in Figure 5, in the present embodiment, described high liquid level indicator light circuit 8 is made up of green LED D3 and resistance R7, the anode of described green LED D3 connects with the output terminal of+5V power supply, and the negative electrode of described green LED D3 is connected with the output terminal of the first voltage comparator circuit 6 by resistance R7.
As shown in Figure 5, in the present embodiment, described low liquid level indicator light circuit 9 is made up of red light emitting diodes D6 and resistance R17, and the anode of described red light emitting diodes D6 is connected with the output terminal of the second voltage comparator circuit 7 by resistance R17, the plus earth of described red light emitting diodes D6.
As shown in Figure 5, in the present embodiment, described middle liquid level indicator light circuit 10 is made up of yellow light-emitting diode D7 and resistance R9, the anode of described yellow light-emitting diode D7 is connected with the output terminal of the first voltage comparator circuit 6 by resistance R9, and the negative electrode of described yellow light-emitting diode D7 connects with the output terminal of the second voltage comparator circuit 7.
As shown in Figure 5, in the present embodiment, described bleeder circuit 11 is made up of resistance R8 and resistance R16, one end after described resistance R8 and resistance R16 connects connects with the output terminal of the first voltage comparator circuit 6, the other end connects with the output terminal of the second voltage comparator circuit 7, and the link of described resistance R8 and resistance R16 is the output terminal VIN of bleeder circuit 11.
When the utility model uses, during low liquid level, the high liquid level line of induction 1 and the middle liquid level line of induction 2 are open-circuit condition, equal no-voltage on resistance R4 and resistance R13, now the output terminal of comparer U1B and the output terminal of comparer U1C all export high level, only have the red light emitting diodes D6 in low liquid level indicator light circuit 9 to light, instruction is now low liquid level, during middle liquid level, the high liquid level line of induction 1 is still open-circuit condition, the output terminal of comparer U1B still exports high level, the short circuit of the middle liquid level line of induction 2, the oscillator signal that oscillatory circuit 3 produces is coupled through nonpolar electric capacity C7, commutation diode D4 and commutation diode D5 rectification, nonpolar electric capacity C9 filtering, voltage after resistance R13 forms rectifying and wave-filtering is as the anti-phase input terminal voltage of comparer U1C, this voltage is greater than the in-phase input end voltage of comparer U1C, therefore the output terminal output low level of comparer U1C, red light emitting diodes D6 in low liquid level indicator light circuit 9 extinguishes, yellow light-emitting diode D7 in middle liquid level indicator light circuit 10 lights, instruction is now middle liquid level, during high liquid level, the also short circuit of the high liquid level line of induction 1, the oscillator signal that oscillatory circuit 3 produces is coupled through nonpolar electric capacity C2, commutation diode D1 and commutation diode D2 rectification, nonpolar electric capacity C4 filtering, voltage after resistance R4 forms rectifying and wave-filtering is as the anti-phase input terminal voltage of comparer U1B, this voltage is greater than the in-phase input end voltage of comparer U1B, therefore the output terminal output low level of comparer U1B, yellow light-emitting diode D7 in middle liquid level indicator light circuit 10 extinguishes, green LED D3 in high liquid level indicator light circuit 8 lights, instruction is now high liquid level.In addition, resistance R8 in bleeder circuit 11 and resistance R16 also carries out dividing potential drop to the voltage of the output terminal of comparer U1B and the output of comparer U1C, the voltage obtained after dividing potential drop is as the anti-phase input terminal voltage of comparer U1D, the in-phase input end voltage of comparer U1D is provided by reference voltage generating circuit 4, when low liquid level, the voltage obtained after the reference voltage that reference voltage generating circuit 4 produces is greater than bleeder circuit 11 dividing potential drop, now, the output terminal of comparer U1D exports high level, triode Q1 conducting, the normally opened contact of relay K closes, water pump 13 is started working, described heating boiler starts water inlet, when central liquid level or high liquid level, the voltage obtained after the reference voltage that reference voltage generating circuit 4 produces is less than bleeder circuit 11 dividing potential drop, now, the output terminal output low level of comparer U1D, triode Q1 ends, and relay K does not work, water pump 13 does not work, and described heating boiler is not intake.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (10)
1. a heating boiler level sensing display control circuit, the water inlet of described heating boiler is connected with water source with the water pump be arranged on water inlet pipe (13) by water inlet pipe, the relay (12) of the current supply circuit for being switched on or switched off water pump (13) is in series with in the current supply circuit of described water pump (13), it is characterized in that: described heating boiler level sensing display control circuit comprises the high liquid level line of induction (1) stretching into heating boiler internal upper part and the middle liquid level line of induction (2) stretching into middle part in heating boiler, and oscillatory circuit (3), reference voltage generating circuit (4) and relay drive circuit (5), described one end of the high liquid level line of induction (1) and one end of the middle liquid level line of induction (2) all connect with the output terminal of oscillatory circuit (3), the other end of the described high liquid level line of induction (1) is connected to the first voltage comparator circuit (6), the other end of the described middle liquid level line of induction (2) is connected to the second voltage comparator circuit (7), the reference voltage input of described first voltage comparator circuit (6), the reference voltage input of the second voltage comparator circuit (7) and the reference voltage input of relay drive circuit (5) all connect with the output terminal of reference voltage generating circuit (4), the output terminal of described first voltage comparator circuit (6) is connected to high liquid level indicator light circuit (8), the output terminal of described second voltage comparator circuit (7) is connected to low liquid level indicator light circuit (9), middle liquid level indicator light circuit (10) and bleeder circuit (11) is connected between the output terminal of described first voltage comparator circuit (6) and the output terminal of the second voltage comparator circuit (7), the comparative voltage input end of described relay drive circuit (5) connects with the output terminal of bleeder circuit (11), described relay (12) connects with the output terminal of relay drive circuit (5),
Described relay drive circuit (5) comprises comparer U1D, triode Q1 and resistance R18, the inverting input of described comparer U1D is the comparative voltage input end of relay drive circuit (5), the in-phase input end of described comparer U1D connects with one end of resistance R18, the other end of described resistance R18 is the reference voltage input of relay drive circuit (5), resistance R19 is connected between the in-phase input end of described comparer U1D and output terminal, the base stage of described triode Q1 is connected with the output terminal of comparer U1D by resistance R21, the output terminal of the current collection of described triode Q1 very relay drive circuit (5), the grounded emitter of described triode Q1.
2. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described oscillatory circuit (3) comprises operational amplifier U1A, the in-phase input end of described operational amplifier U1A is connected with the output terminal of+5V power supply by resistance R1, and by resistance R12 ground connection, resistance R3 is connected between the in-phase input end of described operational amplifier U1A and output terminal, the inverting input of described operational amplifier U1A is by nonpolar electric capacity C1 ground connection, resistance R2 is connected between the inverting input of described operational amplifier U1A and output terminal, the output terminal of described operational amplifier U1A is the output terminal SIG of oscillatory circuit (3).
3. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described reference voltage generating circuit (4) is made up of resistance R10, resistance R11 and polar capacitor C10, one end after described resistance R10 connects with resistance R11 connects with the output terminal of+5V power supply, other end ground connection, the link of described resistance R10 and resistance R11 is the output terminal VREF of reference voltage generating circuit (4), and the link of described resistance R10 and resistance R11 is by polar capacitor C10 ground connection.
4. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described relay (12) is relay K, one end of the coil of described relay K connects with the output terminal of relay drive circuit (5), the other end of the coil of described relay K connects with the output terminal of+5V power supply, the common of described relay K connects with the positive source of water pump (13), the normally opened contact of described relay K connects with the output terminal VCC of the power supply of water pump (13), the normally closed contact of described relay K is unsettled, the power cathode ground connection of described water pump (13).
5. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described first voltage comparator circuit (6) comprises comparer U1B, commutation diode D1, commutation diode D2, nonpolar electric capacity C2 and resistance R5, the negative electrode of described commutation diode D1 and the anode of commutation diode D2 all connect with one end of nonpolar electric capacity C2, the other end of described nonpolar electric capacity C2 connects with the other end of the high liquid level line of induction (1), the negative electrode of described commutation diode D2, one end of nonpolar electric capacity C4 and one end of resistance R4 all connect with the inverting input of comparer U1B, the anode of described commutation diode D1, the other end of nonpolar electric capacity C4 and the equal ground connection of the other end of resistance R4, the in-phase input end of described comparer U1B connects with one end of resistance R5, the other end of described resistance R5 is the reference voltage input terminal of the first voltage comparator circuit (6), the output terminal of described comparer U1B is the output terminal of the first voltage comparator circuit (6), resistance R6 is connected between the in-phase input end of described comparer U1B and output terminal.
6. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described second voltage comparator circuit (7) comprises comparer U1C, commutation diode D4, commutation diode D5, nonpolar electric capacity C7 and resistance R14, the negative electrode of described commutation diode D4 and the anode of commutation diode D5 all connect with one end of nonpolar electric capacity C7, the other end of described nonpolar electric capacity C7 connects with the other end of the middle liquid level line of induction (2), the negative electrode of described commutation diode D5, one end of nonpolar electric capacity C9 and one end of resistance R13 all connect with the inverting input of comparer U1C, the anode of described commutation diode D4, the other end of nonpolar electric capacity C9 and the equal ground connection of the other end of resistance R13, the in-phase input end of described comparer U1C connects with one end of resistance R14, the other end of described resistance R14 is the reference voltage input terminal of the second voltage comparator circuit (7), the output terminal of described comparer U1C is the output terminal of the second voltage comparator circuit (7), resistance R15 is connected between the in-phase input end of described comparer U1C and output terminal.
7. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described high liquid level indicator light circuit (8) is made up of green LED D3 and resistance R7, the anode of described green LED D3 connects with the output terminal of+5V power supply, and the negative electrode of described green LED D3 is connected with the output terminal of the first voltage comparator circuit (6) by resistance R7.
8. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described low liquid level indicator light circuit (9) is made up of red light emitting diodes D6 and resistance R17, the anode of described red light emitting diodes D6 is connected with the output terminal of the second voltage comparator circuit (7) by resistance R17, the plus earth of described red light emitting diodes D6.
9. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described middle liquid level indicator light circuit (10) is made up of yellow light-emitting diode D7 and resistance R9, the anode of described yellow light-emitting diode D7 is connected with the output terminal of the first voltage comparator circuit (6) by resistance R9, and the negative electrode of described yellow light-emitting diode D7 connects with the output terminal of the second voltage comparator circuit (7).
10. according to a kind of heating boiler level sensing display control circuit according to claim 1, it is characterized in that: described bleeder circuit (11) is made up of resistance R8 and resistance R16, one end after described resistance R8 and resistance R16 connects connects with the output terminal of the first voltage comparator circuit (6), the other end connects with the output terminal of the second voltage comparator circuit (7), and the link of described resistance R8 and resistance R16 is the output terminal VIN of bleeder circuit (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520364723.XU CN204679874U (en) | 2015-05-30 | 2015-05-30 | A kind of heating boiler level sensing display control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520364723.XU CN204679874U (en) | 2015-05-30 | 2015-05-30 | A kind of heating boiler level sensing display control circuit |
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| CN204679874U true CN204679874U (en) | 2015-09-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106982746A (en) * | 2015-10-15 | 2017-07-28 | 金基柱 | The water feeder of the automatic dump loader of the potential difference of pin is perceived using two current potentials |
| CN108981848A (en) * | 2018-08-28 | 2018-12-11 | 山东中车华腾环保科技有限公司 | Level display device and its application with analog-digital conversion function |
-
2015
- 2015-05-30 CN CN201520364723.XU patent/CN204679874U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106982746A (en) * | 2015-10-15 | 2017-07-28 | 金基柱 | The water feeder of the automatic dump loader of the potential difference of pin is perceived using two current potentials |
| CN106982746B (en) * | 2015-10-15 | 2020-11-10 | 金基柱 | Water supply device of automatic feed feeder using potential difference of two potential sensing needles |
| CN108981848A (en) * | 2018-08-28 | 2018-12-11 | 山东中车华腾环保科技有限公司 | Level display device and its application with analog-digital conversion function |
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