Centrifugal pump regulation and control circuit

Abstract

The invention discloses a centrifugal pump regulation and control circuit which comprises a main control unit and an auxiliary control unit, the main control unit is used for setting a functional interval, shielding signals outside the interval, filtering interference signals in the interval and activating the auxiliary control unit, and the auxiliary control unit is used for controlling the auxiliary control unit based on a feedback time node of an activation signal. According to the invention, a plurality of centrifugal pumps can share one regulation and control circuit in a one-to-many manner by setting a functional interval, so that the centrifugal pumps only need to be connected in parallel with a nearby centrifugal pump regulation and control transmission circuit when being additionally arranged, and the regulation and control signals in front of the node and at the instant of the node are limited on the non-activated node. According to the method, the current regulation and control signal can be automatically filtered out, unnecessary interference is avoided, after the function is started, regulation and control signals in front of the node and at the moment of the node can be limited on the basis of the feedback time node of the activation signal, and therefore instantaneous misadjustment is prevented when the activation signal is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a centrifugal pump control circuit. Background Art

[0002] After the pumping system is assembled, the controller of the centrifugal pump has been set up. Only when the parameters need to be changed later, the central control end will perform secondary control on the operating parameters of the local centrifugal pump through the signal line. However, in practice, when the pumping system is assembled, a control transmission line will be separately configured for each centrifugal pump. This will not only increase the complexity of the system assembly, but more importantly, in order to avoid possible future expansion needs, it is often necessary to reserve unnecessary control lines at each point. Therefore, a centrifugal pump control circuit is proposed, which can allow multiple centrifugal pumps to share a control line in a one-to-many manner by setting functional intervals, so that when adding centrifugal pumps, they only need to be connected in parallel with the nearest centrifugal pump control transmission line. At non-activated nodes, the current control signal can be automatically filtered out to avoid unnecessary interference. After the function is turned on, the control signal before the node and the node instantaneous can be limited based on the feedback time node of the activation signal, thereby effectively preventing instantaneous misadjustment when the activation signal is obtained. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide a centrifugal pump control circuit, which includes a main control unit and an auxiliary control unit. The main control unit is used for setting functional intervals, shielding signals outside the interval, filtering interference signals within the interval, and activating the auxiliary control unit. The auxiliary control unit limits the control signals before the node and at the node instant based on the feedback time node of the activation signal.

[0004] Further, the main control unit includes a first operational amplifier U1, a fifth operational amplifier U5, a fourth transistor Q4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a twentieth resistor R20, a fifth diode D5, a first capacitor C1, and a first connector P1;

[0005] The first operational amplifier U1 is connected to the same phase end of the first connector P1, the first operational amplifier U1 is connected to the opposite phase end of the second resistor R2 and the third resistor R3, the output end of the first operational amplifier U1 is connected to the anode of the fifth diode D5, the same phase end of the fifth operational amplifier U5 is connected to the collector of the fourth transistor Q4, the sixth resistor R6 and the first capacitor C1, the opposite phase end of the fifth operational amplifier U5 is connected to the seventh resistor R7 and the eighth resistor R8, the fourth transistor Q4 base is connected to the fifth resistor R9, and the base of the fourth transistor Q5 is connected to the collector of the fifth transistor Q6. R5 is connected, the emitter of the fourth transistor Q4 is connected to the cathode of the fifth diode D5 and one end of the fourth resistor R4, one end of the first resistor R1 is connected to the other end of the second resistor R2, the other end of the first resistor R1 is connected to one end of the twentieth resistor R20, the other end of the eighth resistor R8 and the other end of the twentieth resistor R20 are connected to the power supply, the other end of the third resistor R3, the other end of the fourth resistor R4, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the seventh resistor R7, and the other end of the first capacitor C1 are connected to the ground.

[0006] Further, the main control unit also includes a second operational amplifier U2, a fourth operational amplifier U4, a second field effect transistor Q2, a third field effect transistor Q3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a fourth diode D4, and a second capacitor C2;

[0007] The in-phase end of the second operational amplifier U2 is connected to the end of the first connector P1, the inverting end of the second operational amplifier U2 is connected to one end of the first resistor R1, the output end of the second operational amplifier U2 is connected to the gate of the second field effect transistor Q2, the gate of the third field effect transistor Q3, and the anode of the fourth diode D4, the in-phase end of the fourth operational amplifier U4 is connected to the source of the third field effect transistor Q3, one end of the fifteenth resistor R15, and one end of the second capacitor C2, the inverting end of the fourth operational amplifier U4 is connected to one end of the seventh resistor R7, the drain of the second field effect transistor Q2 is connected to one end of the first capacitor C1, the drain of the third field effect transistor Q3 is connected to one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, the cathode of the fourth diode D4 is connected to one end of the fifth resistor R5, the other end of the thirteenth resistor R13 is connected to the power supply, and the other end of the fourteenth resistor R14, the other end of the fifteenth resistor R15, and the other end of the second capacitor C2 are connected to the ground.

[0008] Further, the main control unit also includes a third operational amplifier U3, a first field effect transistor Q1, a fifth field effect transistor Q5, a sixth field effect transistor Q6, and a nineteenth resistor R19;

[0009] The in-phase end of the third operational amplifier U3 is connected to the end of the first connector P1, the inverting end of the third operational amplifier U3 is connected to one end of the twentieth resistor R20, the output end of the third operational amplifier U3 is connected to the gate of the fifth field effect transistor Q5, the gate of the sixth field effect transistor Q6, and one end of the nineteenth resistor R19, the gate of the first field effect transistor Q1 is connected to the gate of the second field effect transistor Q2, the source of the first field effect transistor Q1 is connected to one end of the second capacitor C2, the drain of the fifth field effect transistor Q5 is connected to the anode of the fifth diode D5, the drain of the sixth field effect transistor Q6 is connected to the anode of the fourth diode D4, and the drain of the first field effect transistor Q1, the source of the fifth field effect transistor Q5, the source of the sixth field effect transistor Q6, and the other end of the nineteenth resistor R19 are connected to the ground end.

[0010] Further, the main control unit also includes a sixth operational amplifier U6, a first diode D1, a second diode D2, a third diode D3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a sixteenth resistor R16, and a seventeenth resistor R17;

[0011] The in-phase end of the sixth operational amplifier U6 is connected to the cathode of the first diode D1, the cathode of the second diode D2, one end of the tenth resistor R10, and one end of the twelfth resistor R12. The inverting end of the sixth operational amplifier U6 is connected to the cathode of the third diode D3, one end of the ninth resistor R9, and one end of the eleventh resistor R11. The output end of the sixth operational amplifier U6 is connected to the anode of the first diode D1. The anode of the second diode D2 is connected to the output end of the fifth operational amplifier U5 and one end of the sixteenth resistor R16. The anode of the third diode D3 is connected to the output end of the fourth operational amplifier U4 and one end of the seventeenth resistor R17. The other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are connected to the power supply. The other end of the ninth resistor R9, the other end of the twelfth resistor R12, the other end of the sixteenth resistor R16, and the other end of the seventeenth resistor R17 are connected to the ground.

[0012] Further, the auxiliary control unit includes a seventh operational amplifier U7, a seventh transistor Q7, a sixth diode D6, a seventh diode D7, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fifth resistor R25, a second connector P2, and a third connector P3;

[0013] The in-phase end of the seventh operational amplifier U7 is connected to the end of the third connector P3, the inverting end of the seventh operational amplifier U7 is connected to one end of the twenty-second resistor R22 and one end of the twenty-third resistor R23, the output end of the seventh operational amplifier U7 is connected to the anode of the seventh diode D7, the base of the seventh transistor Q7 is connected to the cathode of the seventh transistor Q7 and one end of the twenty-fifth resistor R25, the emitter of the seventh transistor Q7 is connected to the cathode of the sixth diode D6, the anode of the sixth diode D6 is connected to the end of the second connector P2, the other end of the twenty-third resistor R23 is connected to the power supply, and the other end of the twenty-second resistor R22 and the other end of the twenty-fifth resistor R25 are connected to the ground.

[0014] Further, the auxiliary control unit further includes an eighth operational amplifier U8, an eighth field effect transistor Q8, a ninth field effect transistor Q9, a twenty-first resistor R21, a twenty-fourth resistor R24, and a twenty-seventh resistor R27;

[0015] The in-phase end of the eighth operational amplifier U8 is connected to the collector of the seventh transistor Q7 and one end of the twenty-first resistor R21, the inverting end of the eighth operational amplifier U8 is connected to one end of the twenty-second resistor R22, the output end of the eighth operational amplifier U8 is connected to the gate of the eighth field effect transistor Q8 and the gate of the ninth field effect transistor Q9, the drain of the eighth field effect transistor Q8 is connected to the anode of the seventh diode D7, the drain of the ninth field effect transistor Q9 is connected to the end of the third connector P3, the source of the ninth field effect transistor Q9 is connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27 is connected to the end of the second connector P2, the source of the eighth field effect transistor Q8, the other end of the twenty-first resistor R21, the other end of the twenty-fourth resistor R24, the other end of the twenty-seventh resistor R27 and the ground end are connected.

[0016] Furthermore, the main control unit further includes an eighteenth resistor R18;

[0017] One end of the eighteenth resistor R18 is connected to the gate of the second field effect transistor Q2, and the other end of the eighteenth resistor R18 is connected to the ground.

[0018] Furthermore, the auxiliary control unit further includes a twenty-sixth resistor R26;

[0019] One end of the twenty-sixth resistor R26 is connected to the gate of the eighth field effect transistor Q8, and the other end of the twenty-sixth resistor R26 is connected to the ground.

[0020] The beneficial effects of the present invention compared with the prior art are:

[0021] The present invention can set functional intervals so that multiple centrifugal pumps can share a control line in a one-to-many manner, so that when adding centrifugal pumps, they only need to be connected in parallel with the nearest centrifugal pump control transmission line. At non-activated nodes, the current control signal can be automatically filtered out to avoid unnecessary interference. After the function is turned on, the control signal before the node and the node instantaneous can be limited based on the feedback time node of the activation signal, thereby preventing instantaneous misadjustment when the activation signal is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the main control unit circuit provided by the present invention.

[0024] Figure 2 This is a schematic diagram of the auxiliary control unit circuit provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0026] The present invention discloses a centrifugal pump control circuit, which includes a main control unit and an auxiliary control unit. The main control unit is used for setting a functional interval, shielding signals outside the interval, filtering interference signals within the interval, and activating the auxiliary control unit. The auxiliary control unit limits the control signals before the node and at the node instant based on the feedback time node of the activation signal.

[0027] like Figure 1 As shown, specifically, the main control unit includes a first operational amplifier U1, a fifth operational amplifier U5, a fourth transistor Q4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a twentieth resistor R20, a fifth diode D5, a first capacitor C1, and a first connector P1;

[0028] The first operational amplifier U1 is connected to the same phase end of the first connector P1, the first operational amplifier U1 is connected to the opposite phase end of the second resistor R2 and the third resistor R3, the output end of the first operational amplifier U1 is connected to the anode of the fifth diode D5, the same phase end of the fifth operational amplifier U5 is connected to the collector of the fourth transistor Q4, the sixth resistor R6 and the first capacitor C1, the opposite phase end of the fifth operational amplifier U5 is connected to the seventh resistor R7 and the eighth resistor R8, the fourth transistor Q4 base is connected to the fifth resistor R9, and the base of the fourth transistor Q5 is connected to the collector of the fifth transistor Q6. R5 is connected, the emitter of the fourth transistor Q4 is connected to the cathode of the fifth diode D5 and one end of the fourth resistor R4, one end of the first resistor R1 is connected to the other end of the second resistor R2, the other end of the first resistor R1 is connected to one end of the twentieth resistor R20, the other end of the eighth resistor R8 and the other end of the twentieth resistor R20 are connected to the power supply, the other end of the third resistor R3, the other end of the fourth resistor R4, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the seventh resistor R7, and the other end of the first capacitor C1 are connected to the ground.

[0029] like Figure 1 As shown, specifically, the main control unit also includes a second operational amplifier U2, a fourth operational amplifier U4, a second field effect transistor Q2, a third field effect transistor Q3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a fourth diode D4, and a second capacitor C2;

[0030] The in-phase end of the second operational amplifier U2 is connected to the end of the first connector P1, the inverting end of the second operational amplifier U2 is connected to one end of the first resistor R1, the output end of the second operational amplifier U2 is connected to the gate of the second field effect transistor Q2, the gate of the third field effect transistor Q3, and the anode of the fourth diode D4, the in-phase end of the fourth operational amplifier U4 is connected to the source of the third field effect transistor Q3, one end of the fifteenth resistor R15, and one end of the second capacitor C2, the inverting end of the fourth operational amplifier U4 is connected to one end of the seventh resistor R7, the drain of the second field effect transistor Q2 is connected to one end of the first capacitor C1, the drain of the third field effect transistor Q3 is connected to one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, the cathode of the fourth diode D4 is connected to one end of the fifth resistor R5, the other end of the thirteenth resistor R13 is connected to the power supply, and the other end of the fourteenth resistor R14, the other end of the fifteenth resistor R15, and the other end of the second capacitor C2 are connected to the ground.

[0031] like Figure 1 As shown, specifically, the main control unit further includes a third operational amplifier U3, a first field effect transistor Q1, a fifth field effect transistor Q5, a sixth field effect transistor Q6, and a nineteenth resistor R19;

[0032] The in-phase end of the third operational amplifier U3 is connected to the end of the first connector P1, the inverting end of the third operational amplifier U3 is connected to one end of the twentieth resistor R20, the output end of the third operational amplifier U3 is connected to the gate of the fifth field effect transistor Q5, the gate of the sixth field effect transistor Q6, and one end of the nineteenth resistor R19, the gate of the first field effect transistor Q1 is connected to the gate of the second field effect transistor Q2, the source of the first field effect transistor Q1 is connected to one end of the second capacitor C2, the drain of the fifth field effect transistor Q5 is connected to the anode of the fifth diode D5, the drain of the sixth field effect transistor Q6 is connected to the anode of the fourth diode D4, and the drain of the first field effect transistor Q1, the source of the fifth field effect transistor Q5, the source of the sixth field effect transistor Q6, and the other end of the nineteenth resistor R19 are connected to the ground end.

[0033] like Figure 1 As shown, specifically, the main control unit further includes a sixth operational amplifier U6, a first diode D1, a second diode D2, a third diode D3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a sixteenth resistor R16, and a seventeenth resistor R17;

[0034] The in-phase end of the sixth operational amplifier U6 is connected to the cathode of the first diode D1, the cathode of the second diode D2, one end of the tenth resistor R10, and one end of the twelfth resistor R12. The inverting end of the sixth operational amplifier U6 is connected to the cathode of the third diode D3, one end of the ninth resistor R9, and one end of the eleventh resistor R11. The output end of the sixth operational amplifier U6 is connected to the anode of the first diode D1. The anode of the second diode D2 is connected to the output end of the fifth operational amplifier U5 and one end of the sixteenth resistor R16. The anode of the third diode D3 is connected to the output end of the fourth operational amplifier U4 and one end of the seventeenth resistor R17. The other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are connected to the power supply. The other end of the ninth resistor R9, the other end of the twelfth resistor R12, the other end of the sixteenth resistor R16, and the other end of the seventeenth resistor R17 are connected to the ground.

[0035] like Figure 2 As shown, specifically, the auxiliary control unit includes a seventh operational amplifier U7, a seventh transistor Q7, a sixth diode D6, a seventh diode D7, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fifth resistor R25, a second connector P2, and a third connector P3;

[0036] The in-phase end of the seventh operational amplifier U7 is connected to the end of the third connector P3, the inverting end of the seventh operational amplifier U7 is connected to one end of the twenty-second resistor R22 and one end of the twenty-third resistor R23, the output end of the seventh operational amplifier U7 is connected to the anode of the seventh diode D7, the base of the seventh transistor Q7 is connected to the cathode of the seventh transistor Q7 and one end of the twenty-fifth resistor R25, the emitter of the seventh transistor Q7 is connected to the cathode of the sixth diode D6, the anode of the sixth diode D6 is connected to the end of the second connector P2, the other end of the twenty-third resistor R23 is connected to the power supply, and the other end of the twenty-second resistor R22 and the other end of the twenty-fifth resistor R25 are connected to the ground.

[0037] like Figure 2 As shown, specifically, the auxiliary control unit further includes an eighth operational amplifier U8, an eighth field effect transistor Q8, a ninth field effect transistor Q9, a twenty-first resistor R21, a twenty-fourth resistor R24, and a twenty-seventh resistor R27;

[0038] The in-phase end of the eighth operational amplifier U8 is connected to the collector of the seventh transistor Q7 and one end of the twenty-first resistor R21, the inverting end of the eighth operational amplifier U8 is connected to one end of the twenty-second resistor R22, the output end of the eighth operational amplifier U8 is connected to the gate of the eighth field effect transistor Q8 and the gate of the ninth field effect transistor Q9, the drain of the eighth field effect transistor Q8 is connected to the anode of the seventh diode D7, the drain of the ninth field effect transistor Q9 is connected to the end of the third connector P3, the source of the ninth field effect transistor Q9 is connected to one end of the twenty-fourth resistor R24, one end of the twenty-seventh resistor R27 is connected to the end of the second connector P2, the source of the eighth field effect transistor Q8, the other end of the twenty-first resistor R21, the other end of the twenty-fourth resistor R24, the other end of the twenty-seventh resistor R27 and the ground end are connected.

[0039] like Figure 1 As shown, specifically, the main control unit also includes an eighteenth resistor R18;

[0040] One end of the eighteenth resistor R18 is connected to the gate of the second field effect transistor Q2, and the other end of the eighteenth resistor R18 is connected to the ground.

[0041] like Figure 2 As shown, specifically, the auxiliary control unit further includes a twenty-sixth resistor R26;

[0042] One end of the twenty-sixth resistor R26 is connected to the gate of the eighth field effect transistor Q8, and the other end of the twenty-sixth resistor R26 is connected to the ground.

[0043] See also Figure 1A control circuit is set in the centrifugal pump. The number of control circuits can be set based on the number of mechanisms (functions) that need to be regulated in the pump. A centrifugal pump can be set with multiple control circuits. All control circuits share one control line. The control signal is fed back by the manual / backstage terminal. The function interval threshold range of all control circuits sharing the control line is set to be unique. Each control circuit is a node. During control, the control signal will be fed back to the first connector P1 of the main control unit of all control circuits. The threshold range and the reference value for distinguishing the function interval are set by adjusting the resistance values ​​of the twentieth resistor R20, the first resistor R1, the second resistor R2, and the third resistor R3 in the main control unit. The power signal passes through the twentieth resistor R20, the first resistor R1, the second resistor R2, and the third resistor R3 in the main control unit. The first resistor R1, the second resistor R2, and the third resistor R3 are connected to the ground terminal, the reference signal value at the third resistor R3 terminal to the reference signal value at the first resistor R1 terminal constitutes a threshold range of the functional interval, the reference signal value at the second resistor R2 terminal is a distinguishing reference value within the threshold range, and the distinguishing reference value is used to distinguish the control threshold range of the function start / stop within the threshold range of the functional interval, that is, when the signal amplitude at the first connector P1 terminal is within the threshold range of the functional interval of the control circuit, the signal feedback from the main control unit to the auxiliary control unit in the control circuit is turned on / off, and when the control signal amplitude is higher than the amplitude at the third resistor R3 terminal, the signal at the third resistor R3 terminal is fed back to the inverting terminal of the first operational amplifier U1, and the signal at the first connector P1 terminal is fed back to The first operational amplifier U1 is at the same phase terminal, the first operational amplifier U1 is output, the signal at the output terminal of the first operational amplifier U1 is connected to the ground terminal via the fifth diode D5 and the fourth resistor R4, the signal at the fourth resistor R4 is connected to the ground terminal via the fourth transistor Q4 emitter, the fourth transistor Q4 base, and the fifth resistor R5, the fourth transistor Q4 emitter and the fourth transistor Q4 base are forward biased, the fourth transistor Q4 is turned on, the signal at the fourth resistor R4 is connected to the ground terminal via the fourth transistor Q4 emitter, the fourth transistor Q4 collector, and the sixth resistor R6, and the potential of the first capacitor C1 rises at the same time, the signal at the first capacitor C1 is fed back to the same phase terminal of the fifth operational amplifier U5, and the power supply signal is connected to the eighth resistor R8 and the first The seventh resistor R7 is connected to the ground terminal, and the signal at the seventh resistor R7 end is fed back to the inverting terminal of the fifth operational amplifier U5. When the potential at the first capacitor C1 end is higher than that at the seventh resistor R7 end, the fifth operational amplifier U5 outputs, and the signal at the output end of the fifth operational amplifier U5 is a function-on signal. When the first connector P1 end is in the control threshold range that is turned on within the threshold range of the current control circuit function interval, the main control unit in the control circuit can turn on the signal feedback to the auxiliary control unit. By setting the first capacitor C1 to delay the output of the fifth operational amplifier U5, it is prevented that when P1 obtains an interference signal and the signal amplitude is within the threshold range of the function interval of the node (control circuit), it causes the start-up signal to be erroneously fed back.

[0044] See also Figure 1When the amplitude of the control signal is higher than the amplitude at the second resistor R2, the signal at the second resistor R2 is fed back to the inverting terminal of the second operational amplifier U2, the signal at the first connector P1 is fed back to the non-inverting terminal of the second operational amplifier U2, the second operational amplifier U2 outputs, the signal at the output terminal of the second operational amplifier U2 is connected to the ground terminal through the fourth diode D4 and the fifth resistor R5, the signal at the fifth resistor R5 is applied to the base of the fourth transistor Q4 to cut off the fourth transistor Q4, and at the same time, the signal at the output terminal of the second operational amplifier U2 is fed back to the gate of the second field effect transistor Q2, The gate of the third field effect transistor Q3, the eighteenth resistor R18 is used to discharge the parasitic capacitance of the gate of the second field effect transistor Q2 and the gate of the third field effect transistor Q3, the voltage difference between the gate of the second field effect transistor Q2 and the source of the second field effect transistor Q2 is higher than the conduction threshold, the second field effect transistor Q2 is turned on, the signal at the first capacitor C1 is connected to the ground terminal through the drain of the second field effect transistor Q2 and the source of the second field effect transistor Q2, the potential of the first capacitor C1 is connected to the ground potential, the fifth operational amplifier U5 is cut off, the voltage difference between the gate of the third field effect transistor Q3 and the source of the third field effect transistor Q3 is higher than The third field effect tube Q3 is turned on, and the power supply signal passes through the thirteenth resistor R13 and the fourteenth resistor R14 to the ground terminal. When the third field effect tube Q3 is turned on, the signal at the end of the fourteenth resistor R14 passes through the drain of the third field effect tube Q3, the source of the third field effect tube Q3, and the fifteenth resistor R15 to the ground terminal. The potential of the second capacitor C2 end rises, and the signal at the second capacitor C2 end is fed back to the in-phase end of the fourth operational amplifier U4. The signal at the seventh resistor R7 end is fed back to the inverting end of the fourth operational amplifier U4. When the potential of the second capacitor C2 end is higher than that of the seventh resistor R7 end, the fourth operational amplifier U4 outputs, and the signal at the output end of the fourth operational amplifier U4 is a function shutdown signal. When the first connector P1 end is in the control threshold range of the current control circuit function interval threshold range, the main control unit in the control circuit can turn off the signal feedback to the auxiliary control unit. By setting the first capacitor C2 to delay the output of the fourth operational amplifier U4, it is prevented that when P1 obtains an interference signal and the signal amplitude is within the threshold range of the function interval of the node (control circuit), the shutdown signal is erroneously fed back.

[0045] See also Figure 1If the amplitude of the control signal is higher than the amplitude at the first resistor R1, the signal at the first resistor R1 is fed back to the inverting terminal of the third operational amplifier U3, the signal at the first connector P1 is fed back to the non-inverting terminal of the third operational amplifier U3, the third operational amplifier U3 is output, and the output terminal signal of the third operational amplifier U3 is fed back to the gate of the fifth field effect transistor Q5 and the gate of the sixth field effect transistor Q6. The voltage difference between the gate of the fifth field effect transistor Q5 and the source of the fifth field effect transistor Q5 is higher than the conduction threshold, the fifth field effect transistor Q5 is turned on, the output terminal potential of the first operational amplifier U1 reaches the ground potential, the voltage difference between the gate of the sixth field effect transistor Q6 and the source of the sixth field effect transistor Q6 is higher than the conduction threshold, the sixth field effect transistor Q6 is turned on, and the output terminal potential of the second operational amplifier U2 reaches the ground potential. The signal at the output end of the second operational amplifier U2 is fed back to the gate of the first field effect transistor Q1. When the potential of the output end of the second operational amplifier U2 reaches the ground potential, the voltage difference between the gate of the first field effect transistor Q1 and the source of the first field effect transistor Q1 is lower than the conduction threshold, the first field effect transistor Q1 is turned on, and the potential of the second capacitor C2 reaches the ground end through the source of the first field effect transistor Q1 and the drain of the first field effect transistor Q1. The potential of the second capacitor C2 reaches the ground potential, and the fourth operational amplifier U4 is cut off. In this way, when the amplitude of the control signal is not within the threshold range of the functional interval of the node, the signal outside the interval is shielded, so that multiple centrifugal pumps can share a control line one-to-many. At the inactive node, the current control signal can be automatically filtered out to avoid unnecessary interference.

[0046] See also Figure 1, the power supply signal reaches the ground terminal through the tenth resistor R10 and the twelfth resistor R12, the signal at the twelfth resistor R12 end is fed back to the in-phase end of the sixth operational amplifier U6, the power supply signal reaches the ground terminal through the eleventh resistor R11 and the ninth resistor R9, the signal at the ninth resistor R9 end is fed back to the inverting end of the sixth operational amplifier U6, the circuit is initially set to make the signal at the ninth resistor R9 end higher than the signal at the twelfth resistor R12 end, the sixth operational amplifier U6 is in the cut-off state, the output terminal signal of the fourth operational amplifier U4 reaches the ground terminal through the seventeenth resistor R17, the output terminal signal of the fifth operational amplifier U5 reaches the ground terminal through the sixteenth resistor R16, when the fifth operational amplifier U5 outputs, the signal at the sixteenth resistor R16 end is clamped to the signal at the twelfth resistor R12 end after passing through the second diode D2, the twelfth resistor R12 end The signal is higher than the signal at the end of the ninth resistor R9, and the sixth operational amplifier U6 outputs. The signal at the output end of the sixth operational amplifier U6 is the activation signal of the auxiliary control unit. At the same time, the signal at the output end of the sixth operational amplifier U6 is clamped again to the signal at the end of the twelfth resistor R12 after passing through the first diode D1, so that the sixth operational amplifier U6 can continue to feedback the activation signal after the fifth operational amplifier U5 is turned off. When the fourth operational amplifier U4 outputs, the signal at the end of the seventeenth resistor R17 is clamped to the signal at the end of the ninth resistor R9 after passing through the third diode D3. The signal at the end of the ninth resistor R9 is higher than the signal at the end of the twelfth resistor R12, and the sixth operational amplifier U6 is turned off. In this way, the functional start / close signal fed back by the fifth operational amplifier U5 and the fourth operational amplifier U4 enables the sixth operational amplifier U6 to control the activation state of the node.

[0047] See also Figure 2 , the control signal is fed back to the auxiliary control unit through the third connector P3, the power signal is fed back to the ground terminal through the twenty-third resistor R23 and the twenty-second resistor R22, the signal at the twenty-second resistor R22 end is fed back to the inverting terminal of the seventh operational amplifier U7, the signal at the twenty-second resistor R22 end is a zero potential offset signal, which is slightly higher than the zero potential, and the signal at the third connector P3 end is fed back to the non-inverting terminal of the seventh operational amplifier U7. When the third connector P3 obtains any control signal feedback, the seventh operational amplifier U7 outputs, and the signal at the output terminal of the seventh operational amplifier U7 is a limiting signal. The signal goes to the ground terminal through the seventh diode D7 and the twenty-fifth resistor R25, the signal at the end of the twenty-fifth resistor R25 is applied to the base of the seventh transistor Q7, the activation signal is fed back to the second connector P2 of the auxiliary control unit, the signal at the end of the second connector P2 goes to the ground terminal through the twenty-seventh resistor R27, the signal at the end of the twenty-seventh resistor R27 is applied to the emitter of the seventh transistor Q7 through the sixth diode D6, and the seventh transistor Q7 is in the cut-off state, so that the auxiliary control unit can limit the control signal before the node and the node instantaneously based on the feedback time node of the activation signal, so as to prevent instantaneous misadjustment when obtaining the activation signal.

[0048] See also Figure 2 When the third connector P3 loses the current control signal feedback, the seventh operational amplifier U7 is cut off, the emitter of the seventh transistor Q7 and the base of the seventh transistor Q7 are forward biased, the seventh transistor Q7 is turned on, and the signal at the second connector P2 end is connected to the ground end via the sixth diode D6, the seventh transistor Q7, and the twenty-first resistor R21. The signal at the twenty-first resistor R21 end is fed back to the in-phase end of the eighth operational amplifier U8, and the signal at the twenty-second resistor R22 end is fed back to the inverting end of the eighth operational amplifier U8. The eighth operational amplifier U8 outputs, and the output end signal of the eighth operational amplifier U8 is fed back to the gate of the eighth field effect transistor Q8 and the gate of the ninth field effect transistor Q9. The twenty-sixth resistor R26 is used to discharge the parasitic capacitance of the gate of the eighth field effect transistor Q8 and the gate of the ninth field effect transistor Q9. The gate of the eighth field effect transistor Q8 and the gate of the eighth field effect transistor Q8 are connected to the gate of the eighth field effect transistor Q8. The voltage difference between the sources is higher than the conduction threshold, and the eighth field effect transistor Q8 is turned on, so that when the third connector P3 obtains the control signal again, the output potential of the seventh operational amplifier U7 can be pulled down to the ground potential. At the same time, the voltage difference between the gate of the ninth field effect transistor Q9 and the source of the ninth field effect transistor Q9 is higher than the conduction threshold, and the ninth field effect transistor Q9 is turned on. The signal at the third connector P3 end is connected to the ground end through the drain of the ninth field effect transistor Q9, the source of the ninth field effect transistor Q9, and the twenty-fourth resistor R24. The signal at the twenty-fourth resistor R24 ​​is fed back to the control mechanism, and the control mechanism performs corresponding control according to the amplitude of the signal at the third connector P3 end. The amplitude of the demand signal of the control mechanism is not within the functional interval threshold range of any node. Therefore, when the feedback of the control signal stops after the control signal activates the node, the restriction is lifted so that the control mechanism can obtain the next control signal feedback.

[0049] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A centrifugal pump control circuit, characterized in that: The control circuit includes a main control unit and an auxiliary control unit. The main control unit is used for setting functional intervals, shielding signals outside the interval, filtering interference signals within the interval, and activating the auxiliary control unit. The auxiliary control unit limits the control signals before the node and at the node instant based on the feedback time node of the activation signal.

2. The centrifugal pump control circuit according to claim 1, characterized in that: The main control unit includes a first operational amplifier, a fifth operational amplifier, a fourth triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a twentieth resistor, a fifth diode, a first capacitor, and a first connector; The non-inverting end of the first operational amplifier is connected to the first connector end, the inverting end of the first operational amplifier is connected to one end of the second resistor and one end of the third resistor, the output end of the first operational amplifier is connected to the anode of the fifth diode, the non-inverting end of the fifth operational amplifier is connected to the collector of the fourth transistor, one end of the sixth resistor, and one end of the first capacitor, the inverting end of the fifth operational amplifier is connected to one end of the seventh resistor and one end of the eighth resistor, the base of the fourth transistor is connected to one end of the fifth resistor, the emitter of the fourth transistor is connected to the cathode of the fifth diode and one end of the fourth resistor, one end of the first resistor is connected to the other end of the second resistor, the other end of the first resistor is connected to one end of the twentieth resistor, the other end of the eighth resistor and the other end of the twentieth resistor are connected to the power supply, and the other end of the third resistor, the other end of the fourth resistor, the other end of the fifth resistor, the other end of the sixth resistor, the other end of the seventh resistor, the other end of the first capacitor and the ground end are connected.

3. The centrifugal pump control circuit according to claim 2, characterized in that: The main control unit also includes a second operational amplifier, a fourth operational amplifier, a second field effect transistor, a third field effect transistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fourth diode, and a second capacitor; The non-inverting end of the second operational amplifier is connected to the first connector end, the inverting end of the second operational amplifier is connected to one end of the first resistor, the output end of the second operational amplifier is connected to the gate of the second field effect tube, the gate of the third field effect tube, and the anode of the fourth diode, the non-inverting end of the fourth operational amplifier is connected to the source of the third field effect tube, one end of the fifteenth resistor, and one end of the second capacitor, the inverting end of the fourth operational amplifier is connected to one end of the seventh resistor, the drain of the second field effect tube is connected to one end of the first capacitor, the drain of the third field effect tube is connected to one end of the thirteenth resistor and one end of the fourteenth resistor, the cathode of the fourth diode is connected to one end of the fifth resistor, the other end of the thirteenth resistor is connected to the power supply, and the other ends of the fourteenth resistor, the other ends of the fifteenth resistor, the other end of the second capacitor are connected to the ground.

4. The centrifugal pump control circuit according to claim 3, characterized in that: The main control unit also includes a third operational amplifier, a first field effect transistor, a fifth field effect transistor, a sixth field effect transistor, and a nineteenth resistor; The third operational amplifier has a common-phase end connected to the first connector end, an inverting end connected to one end of the twentieth resistor, an output end of the third operational amplifier connected to the fifth field effect transistor gate, the sixth field effect transistor gate, and one end of the nineteenth resistor, the first field effect transistor gate is connected to the second field effect transistor gate, the first field effect transistor source is connected to one end of the second capacitor, the fifth field effect transistor drain is connected to the fifth diode anode, the sixth field effect transistor drain is connected to the fourth diode anode, and the first field effect transistor drain, the fifth field effect transistor source, the sixth field effect transistor source, the other end of the nineteenth resistor are connected to the ground end.

5. The centrifugal pump control circuit according to claim 3, characterized in that: The main control unit further includes a sixth operational amplifier, a first diode, a second diode, a third diode, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a sixteenth resistor, and a seventeenth resistor; The in-phase end of the sixth operational amplifier is connected to the cathode of the first diode, the cathode of the second diode, one end of the tenth resistor, and one end of the twelfth resistor. The inverting end of the sixth operational amplifier is connected to the cathode of the third diode, one end of the ninth resistor, and one end of the eleventh resistor. The output end of the sixth operational amplifier is connected to the anode of the first diode. The anode of the second diode is connected to the output end of the fifth operational amplifier and one end of the sixteenth resistor. The anode of the third diode is connected to the output end of the fourth operational amplifier and one end of the seventeenth resistor. The other end of the tenth resistor and the other end of the eleventh resistor are connected to the power supply. The other end of the ninth resistor, the other end of the twelfth resistor, the other end of the sixteenth resistor, and the other end of the seventeenth resistor are connected to the ground.

6. The centrifugal pump control circuit according to claim 1, characterized in that: The auxiliary control unit includes a seventh operational amplifier, a seventh triode, a sixth diode, a seventh diode, a twenty-second resistor, a twenty-third resistor, a twenty-fifth resistor, a second connector, and a third connector; The non-inverting end of the seventh operational amplifier is connected to the third connector end, the inverting end of the seventh operational amplifier is connected to one end of the twenty-second resistor and one end of the twenty-third resistor, the output end of the seventh operational amplifier is connected to the anode of the seventh diode, the base of the seventh transistor is connected to the cathode of the seventh transistor and one end of the twenty-fifth resistor, the emitter of the seventh transistor is connected to the cathode of the sixth diode, the anode of the sixth diode is connected to the second connector end, the other end of the twenty-third resistor is connected to the power supply, and the other ends of the twenty-second resistor and the other ends of the twenty-fifth resistor are connected to the ground end.

7. The centrifugal pump control circuit according to claim 6, characterized in that: The auxiliary control unit further includes an eighth operational amplifier, an eighth field effect transistor, a ninth field effect transistor, a twenty-first resistor, a twenty-fourth resistor, and a twenty-seventh resistor; The in-phase end of the eighth operational amplifier is connected to the collector of the seventh transistor and one end of the twenty-first resistor, the inverting end of the eighth operational amplifier is connected to one end of the twenty-second resistor, the output end of the eighth operational amplifier is connected to the gate of the eighth field effect transistor and the gate of the ninth field effect transistor, the drain of the eighth field effect transistor is connected to the anode of the seventh diode, the drain of the ninth field effect transistor is connected to the third connector end, the source of the ninth field effect transistor is connected to one end of the twenty-fourth resistor, one end of the twenty-seventh resistor is connected to the second connector end, and the source of the eighth field effect transistor, the other end of the twenty-first resistor, the other end of the twenty-fourth resistor, the other end of the twenty-seventh resistor and the ground end are connected.

8. The centrifugal pump control circuit according to claim 2, characterized in that: The main control unit also includes an eighteenth resistor; One end of the eighteenth resistor is connected to the gate of the second field effect transistor, and the other end of the eighteenth resistor is connected to the ground.

9. The centrifugal pump control circuit according to claim 7, characterized in that: The auxiliary control unit further includes a twenty-sixth resistor; One end of the twenty-sixth resistor is connected to the gate of the eighth field effect transistor, and the other end of the twenty-sixth resistor is connected to the ground.

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