CN110034609B - 35KV transformer substation detection control system - Google Patents
35KV transformer substation detection control system Download PDFInfo
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Abstract
A35 KV transformer substation detection control system comprises a main control chip, wherein the main control chip is AT89C51 in model, the main control chip is connected with a clock module, a power supply module, an equipment selection module, a temperature module and a residual current module through a lead, an amplification module is further arranged in the main control chip and used for receiving detection data and amplifying the detection data, the amplification module comprises a main amplifier and an auxiliary amplifier which are electrically connected, the main amplifier is ICL7650 in model, and the auxiliary amplifier is OP07 in model; the device comprises a clock module, a power supply module, a device selection module, a temperature module and a residual current module, wherein the clock module is used for setting check time nodes corresponding to different devices, the power supply module is used for supplying power to a main control chip, the device selection module is used for selecting different devices in a transformer substation to detect, the temperature module is used for detecting the temperature of the devices, and the residual current module is used for detecting the residual current of the devices.
Description
The technical field is as follows:
the invention relates to a 35KV transformer substation detection control system.
Background art:
the transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system, and the transformer substation in a power plant is a boosting transformer substation which is used for boosting the electric energy generated by a generator and then feeding the electric energy into a high-voltage power grid.
The transformer station mainly comprises a first-class transformer station, a second-class transformer station, a third-class transformer station and a fourth-class transformer station, wherein the 35KV transformer station belongs to the fourth-class transformer station; the electrical equipment in the transformer substation is divided into primary equipment and secondary equipment, the primary equipment mainly comprises a transformer, a high-voltage circuit breaker, a disconnecting switch, a bus, a lightning arrester, a capacitor, a reactor and the like, and the secondary equipment mainly comprises a relay protection device, an automatic device, a measurement and control device, a metering device, an automatic system and direct current equipment for providing power for the secondary equipment.
Because the 35KV transformer substation has more types and numbers of devices, in order to ensure that the 35KV transformer substation can normally operate and use for a long time, various detection devices are required to be additionally arranged in the transformer substation for monitoring, particularly temperature detection and residual current detection; every detection device on the existing transformer substation detection control system works independently, and data interaction and information transmission among the detection devices are less, so that the practicability and safety of the detection control system are reduced.
The invention content is as follows:
the 35KV transformer substation detection control system provided by the embodiment of the invention is reasonable in structural design, data and information on various detection modules can be collected and sorted by adopting a mode of combining a main control chip and various detection modules, the use state of the transformer substation is judged by analyzing and processing various different detection data, the normal operation of the transformer substation is ensured, accidents are prevented, the safety is improved, and the problems in the prior art are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a35 KV transformer substation detection control system comprises a main control chip, wherein the main control chip is AT89C51 in model, the main control chip is connected with a clock module, a power supply module, an equipment selection module, a temperature module and a residual current module through a lead, an amplification module is further arranged in the main control chip and used for receiving detection data and amplifying the detection data, the amplification module comprises a main amplifier and an auxiliary amplifier which are electrically connected, the main amplifier is ICL7650 in model, and the auxiliary amplifier is OP07 in model; the device comprises a clock module, a power supply module, a device selection module, a temperature module and a residual current module, wherein the clock module is used for setting check time nodes corresponding to different devices, the power supply module is used for supplying power to a main control chip, the device selection module is used for selecting different devices in a transformer substation to detect, the temperature module is used for detecting the temperature of the devices, and the residual current module is used for detecting the residual current of the devices.
The main control chip is in the model of AT89C51, 40 pins are arranged on the main control chip, the main control chip is connected with a reset circuit through an RST pin, and the reset circuit comprises a resistor, a capacitor and a reset key which are electrically connected; the main control chip is connected with a crystal oscillator circuit through an X1 pin and an X2 pin, and the crystal oscillator circuit comprises a capacitor and a crystal oscillator which are connected through current.
The fifth grounding of the main amplifier is arranged, a signal input interface and a fourth resistor which are connected in series are arranged between the fourth pin and the fifth pin of the main amplifier, a first resistor, a second resistor and a fifth resistor which are connected in series are arranged between the fourth pin and the tenth pin of the main amplifier, a first capacitor is connected in parallel to the first resistor, the first resistor is connected in series with a third resistor, the third resistor is arranged in a grounding manner, the third resistor is connected with a third capacitor, and the third capacitor is connected with the seventh pin of the main amplifier; a pin seven of the main amplifier is connected with a voltage of-5V, a pin eleven of the main amplifier is connected with a voltage of +5V and a second capacitor, a fourth capacitor is arranged between the pin I and the pin eight of the main amplifier, and a fifth capacitor is arranged between the pin II and the pin eight of the main amplifier; the main amplifier is connected with a second pin of the auxiliary amplifier through a fifth resistor and a sixth resistor which are connected in series, a third pin of the auxiliary amplifier is connected with a seventh resistor, the seventh resistor is grounded, a first variable resistor is arranged between the third pin and the sixth pin of the auxiliary amplifier, a second variable resistor is arranged between the second pin and the sixth pin of the auxiliary amplifier, the seventh pin of the auxiliary amplifier is connected with +15V and a sixth capacitor, and a fourth pin of the auxiliary amplifier is connected with-15V and a seventh capacitor; the first capacitor and the first resistor form a feedback network to reduce self-oscillation generated by phase shift, and the first resistor, the second resistor and the third resistor form a T-shaped network as a feedback high resistance to improve the amplification factor of the circuit and increase the signal-to-noise ratio of an output signal.
The power supply module comprises a transformer, a rectifier bridge is arranged on the secondary side of the transformer, a first voltage stabilizing chip and a second voltage stabilizing chip are arranged on the rectifier bridge, and a first diode, a second diode, a fourth diode and a fifth diode are arranged between the first voltage stabilizing chip and the second voltage stabilizing chip; the model of first steady voltage chip is LM7815, the model of second steady voltage chip is LM 7915.
The device selection module comprises 7 keys, the keys S1, S2, S3, S4, S5, S6 and S7 are respectively and correspondingly connected with a P31 pin, a P32 pin, a P33 pin, a P34 pin, a P35 pin, a P36 pin and a P37 pin of the main control chip, and the keys are arranged in common; the keys are used for accessing different devices.
The clock module comprises a clock chip, the model of the clock chip is DS1302, 8 pins are arranged on the clock chip, a second crystal oscillator is connected to a second pin and a third pin of the clock chip, an eighth pin of the clock chip is connected with a power supply, a fourth pin of the clock chip is grounded, and a fifth pin, a sixth pin and a seventh pin of the clock chip are correspondingly connected with a P12 pin, a P11 pin and a P10 pin of the main control chip respectively.
The temperature module comprises a temperature detection chip, wherein 3 pins are arranged on the temperature detection chip, a pin of the temperature detection chip is grounded, a pin of the temperature detection chip is connected with a power supply, a pin of the temperature detection chip is connected with a P21 pin of the main control chip, and an eleventh resistor is connected between the pin of the temperature detection chip and the pin of the main control chip.
The model of the temperature detection chip is DS18B 20.
The main control chip is connected with a residual current module through an EA pin, the residual current module comprises a first operational amplifier UL1, a second operational amplifier UL2, a third operational amplifier UL3 and a fourth operational amplifier UL4 which are electrically connected, and a protective peripheral circuit composed of a resistor and a capacitor is arranged between the operational amplifiers respectively.
The models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are all LM 712.
By adopting the structure, the received detection data signal is amplified through the amplification module in the main control chip, so that the detection data received by the main control chip is more accurate; different devices in the transformer substation are selected for detection through keys on the device selection module; setting corresponding detection time periods for different devices in the transformer substation through a clock module; carry out temperature detection and residual current detection through temperature module and residual current module to the equipment in the transformer substation, guarantee the equipment normal operating and the use in the transformer substation, have that factor of safety is high, the practicality is strong advantage.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an electrical schematic diagram of the main control chip of the present invention.
Fig. 3 is an electrical schematic of the amplification module of the present invention.
Fig. 4 is an electrical schematic of the power module of the present invention.
Fig. 5 is an electrical schematic of the device selection module of the present invention.
Fig. 6 is an electrical schematic diagram of the clock module of the present invention.
Fig. 7 is an electrical schematic of the temperature module of the present invention.
Fig. 8 is an electrical schematic of a residual current module of the present invention.
The specific implementation mode is as follows:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1 to 8, a 35KV substation detection control system includes a main control chip, the main control chip is AT89C51 in model, the main control chip is connected to a clock module, a power supply module, a device selection module, a temperature module and a residual current module through wires, the main control chip is further provided with an amplification module in the main control chip, the amplification module is used for receiving detection data and amplifying the detection data, the amplification module includes a main amplifier and an auxiliary amplifier which are electrically connected, the main amplifier is ICL7650 in model, and the auxiliary amplifier is OP07 in model; the device comprises a clock module, a power supply module, a device selection module, a temperature module and a residual current module, wherein the clock module is used for setting check time nodes corresponding to different devices, the power supply module is used for supplying power to a main control chip, the device selection module is used for selecting different devices in a transformer substation to detect, the temperature module is used for detecting the temperature of the devices, and the residual current module is used for detecting the residual current of the devices.
The main control chip is in the model of AT89C51, 40 pins are arranged on the main control chip, the main control chip is connected with a reset circuit through an RST pin, and the reset circuit comprises a resistor, a capacitor and a reset key which are electrically connected; the main control chip is connected with a crystal oscillator circuit through an X1 pin and an X2 pin, and the crystal oscillator circuit comprises a capacitor and a crystal oscillator which are connected through current.
The fifth grounding of the main amplifier is arranged, a signal input interface and a fourth resistor which are connected in series are arranged between the fourth pin and the fifth pin of the main amplifier, a first resistor, a second resistor and a fifth resistor which are connected in series are arranged between the fourth pin and the tenth pin of the main amplifier, a first capacitor is connected in parallel to the first resistor, the first resistor is connected in series with a third resistor, the third resistor is arranged in a grounding manner, the third resistor is connected with a third capacitor, and the third capacitor is connected with the seventh pin of the main amplifier; a pin seven of the main amplifier is connected with a voltage of-5V, a pin eleven of the main amplifier is connected with a voltage of +5V and a second capacitor, a fourth capacitor is arranged between the pin I and the pin eight of the main amplifier, and a fifth capacitor is arranged between the pin II and the pin eight of the main amplifier; the main amplifier is connected with a second pin of the auxiliary amplifier through a fifth resistor and a sixth resistor which are connected in series, a third pin of the auxiliary amplifier is connected with a seventh resistor, the seventh resistor is grounded, a first variable resistor is arranged between the third pin and the sixth pin of the auxiliary amplifier, a second variable resistor is arranged between the second pin and the sixth pin of the auxiliary amplifier, the seventh pin of the auxiliary amplifier is connected with +15V and a sixth capacitor, and a fourth pin of the auxiliary amplifier is connected with-15V and a seventh capacitor; the first capacitor and the first resistor form a feedback network to reduce self-oscillation generated by phase shift, and the first resistor, the second resistor and the third resistor form a T-shaped network as a feedback high resistance to improve the amplification factor of the circuit and increase the signal-to-noise ratio of an output signal.
The power supply module comprises a transformer, a rectifier bridge is arranged on the secondary side of the transformer, a first voltage stabilizing chip and a second voltage stabilizing chip are arranged on the rectifier bridge, and a first diode, a second diode, a fourth diode and a fifth diode are arranged between the first voltage stabilizing chip and the second voltage stabilizing chip; the model of first steady voltage chip is LM7815, the model of second steady voltage chip is LM 7915.
The device selection module comprises 7 keys, the keys S1, S2, S3, S4, S5, S6 and S7 are respectively and correspondingly connected with a P31 pin, a P32 pin, a P33 pin, a P34 pin, a P35 pin, a P36 pin and a P37 pin of the main control chip, and the keys are arranged in common; the keys are used for accessing different devices.
The clock module comprises a clock chip, the model of the clock chip is DS1302, 8 pins are arranged on the clock chip, a second crystal oscillator is connected to a second pin and a third pin of the clock chip, an eighth pin of the clock chip is connected with a power supply, a fourth pin of the clock chip is grounded, and a fifth pin, a sixth pin and a seventh pin of the clock chip are correspondingly connected with a P12 pin, a P11 pin and a P10 pin of the main control chip respectively.
The temperature module comprises a temperature detection chip, wherein 3 pins are arranged on the temperature detection chip, a pin of the temperature detection chip is grounded, a pin of the temperature detection chip is connected with a power supply, a pin of the temperature detection chip is connected with a P21 pin of the main control chip, and an eleventh resistor is connected between the pin of the temperature detection chip and the pin of the main control chip.
The model of the temperature detection chip is DS18B 20.
The main control chip is connected with a residual current module through an EA pin, the residual current module comprises a first operational amplifier UL1, a second operational amplifier UL2, a third operational amplifier UL3 and a fourth operational amplifier UL4 which are electrically connected, and a protective peripheral circuit composed of a resistor and a capacitor is arranged between the operational amplifiers respectively.
The models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are all LM 712.
When the temperature detection device is used, the temperature detection chip is electrically connected to each device of the transformer substation, the probe of the temperature detection chip is placed on the component with the highest temperature of the device, temperature detection is carried out, and each component in the transformer substation is prevented from being burnt; the residual current module is used for connecting the output current of each device of the transformer substation to the main control chip and detecting the residual current of each device, so that a worker can be helped to quickly find the position of a fault generating device, faults in the transformer substation are efficiently discharged, and the operation of the transformer substation is ensured; the amplifying module in the main control chip can filter and amplify signal data received by the system, so that the information acquired by the main control chip is more accurate, the accuracy of system operation instructions is ensured, and the phenomenon of misoperation can not occur; the signal input interface on the main amplifier can be accessed with various different detection data, so that the diversity of system functions is increased; the clock module on the system can set different detection time for different devices in the transformer substation, so that the main control chip can more stably monitor the transformer substation; the equipment selection module is provided with a plurality of button switches, each button switch corresponds to equipment in different substations, different buttons are pressed down to enable different equipment to be connected, and the equipment enters a detection state; the power supply module provides direct-current voltages of different grades to the main control chip through the first voltage stabilizing module and the second voltage stabilizing module, so that the main control chip can normally operate under various different conditions; in the detection control system, the detection device on each device is not independently or separately separated according to the existing detection mode, each device carries out corresponding signal acquisition, and cannot form a whole, so that detection errors are easily caused, and the normal use of a transformer substation is influenced; the clock module is matched with the equipment selection module, so that the main control chip can select equipment one by one for detection, and the main control chip can comprehensively master the use state of each equipment in the transformer substation; the main control chip can be connected with a wireless module or a display module, so that an operator can visually and timely receive detection information and data, and when a certain device in the transformer substation breaks down, the operator can quickly respond to the failure to carry out emergency repair, thereby avoiding large safety accidents and ensuring the normal operation of the transformer substation; AT89C51 is selected to the main control chip, and is multiple functional, low cost, and each electrical component and each functional module in the cooperation system carry out information interaction and data transmission between main control chip and each functional module, can detect different equipment in the transformer substation.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (7)
1. The 35KV transformer substation detection control system is characterized in that: the intelligent detection device comprises a main control chip, wherein the main control chip is AT89C51 in model, the main control chip is connected with a clock module, a power supply module, an equipment selection module, a temperature module and a residual current module through a lead, an amplification module is further arranged in the main control chip and used for receiving detection data and amplifying the detection data, the amplification module comprises a main amplifier and an auxiliary amplifier which are electrically connected, the main amplifier is ICL7650 in model, and the auxiliary amplifier is OP07 in model; the clock module is used for setting check time nodes corresponding to different devices, the power supply module is used for supplying power to the main control chip, the device selection module is used for selecting different devices in the transformer substation for detection, the temperature module is used for detecting the temperature of the devices, and the residual current module is used for detecting the residual current of the devices;
the No. 5 pin of the main amplifier is grounded and is connected to the signal input port; the pin No. 4 of the main amplifier is connected with one end of a resistor R4, and the other end of the resistor R4 is respectively connected with a signal input port, the pin No. 9 of the main amplifier, one end of a capacitor C1 and one end of a resistor R1; the other end of the capacitor C1 is connected to the other end of the resistor R1, one end of the resistor R2 and one end of the resistor R3 respectively; the other end of the resistor R1 is connected to the other end of the capacitor C1, one end of the resistor R2 and one end of the resistor R3 respectively; the No. 10 pin of the main amplifier is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with one end of a resistor R8 and is also connected with the No. 2 pin of the auxiliary amplifier; the other end of the resistor R2 is connected with the other end of the resistor R5 and is also connected with one end of the resistor R6; the other end of the resistor R3 is connected to one end of the capacitor C3 and is grounded; the other end of the capacitor C3 is connected with a No. 7 pin of the main amplifier and is simultaneously connected with a-5V power supply;
the No. 2 pin of the secondary amplifier is simultaneously connected to one end of the resistor R8; the pin No. 3 of the secondary amplifier is connected with one end of a resistor R7, and the other end of the resistor R7 is grounded; the No. 3 pin is connected to one end of a resistor R9; the No. 6 pin of the auxiliary amplifier is respectively connected to the other end of the resistor R8 and the other end of the resistor R9, and the No. 6 pin of the auxiliary amplifier is simultaneously used as an output end to output amplified detection data;
the equipment selection module is provided with a plurality of key switches, each key switch corresponds to different equipment in the transformer substation, and different equipment is switched on based on different key switches so as to enable the equipment to enter a detection state;
the clock module and the equipment selection module are matched with each other, so that the main control chip selects equipment one by one for detection, and the main control chip obtains the use state of each equipment in the transformer substation;
the main control chip is connected with a residual current module through an EA pin, and the residual current module comprises a first operational amplifier UL1, a second operational amplifier UL2, a third operational amplifier UL3 and a fourth operational amplifier UL4 which are electrically connected;
the reverse input end of the UL1 is respectively connected with one end of a resistor RL4, one end of a resistor RL1 and one end of a diode DL 1; the other end of the resistor RL4 is grounded and is connected with one end of a resistor RL5 and one end of a capacitor CL 3; the positive input end of the UL1 is connected with one end of a RL 6; the other end of the resistor RL6 is respectively connected with the other end of the resistor RL5, the other end of the capacitor CL3, the data input port and one end of the resistor RL 9; the output end of the UL1 is connected with the other end of the diode DL1 and is also connected with one end of the diode DL 2; the other end of the diode DL2 is connected with the other end of the resistor RL1 and is also connected with one end of the resistor RL 7;
the reverse input end of the UL2 is connected to the other end of the resistor RL7 and is also connected to one end of the resistor RL 2; the positive input end of the UL2 is connected to the other end of the resistor RL 9; the output end of the UL2 is connected to the other end of the resistor RL2 and is also connected to one end of the resistor RL 10;
the other end of the resistor RL10 is connected with the positive input end of the UL 3; the reverse input end of the UL3 is respectively connected with one end of a resistor RL11, one end of a capacitor CL1, one end of a resistor RL3 and one end of a resistor RL 8; the other end of the resistor RL8 is grounded; the other end of the resistor RL11 is connected with a 3.3V power supply; the output end of the UL3 is respectively connected with the other end of the capacitor CL1, the other end of the resistor RL3 and the positive input end of the UL 4;
the positive input end of the UL4 is also connected to the other end of the resistor RL3 and the other end of the capacitor CL 1; the reverse input end of the UL4 is connected with one end of a resistor RL13 and one end of a resistor RL 12; the other end of the resistor RL12 is grounded; the output end of the UL4 is respectively connected with the other end of the resistor RL13, one end of the capacitor CL4 and the data output port; the other end of the capacitor CL4 is grounded;
the power supply ends of the UL1, UL2, UL3 and UL4 are connected with a power supply AVCC in common, and the power supply ends of the UL1, UL2, UL3 and UL4 are connected with one end of a capacitor CL5 at the same time; the other end of the capacitor CL5 is grounded;
the clock module comprises a clock chip, the model of the clock chip is DS1302, 8 pins are arranged on the clock chip, a second crystal oscillator is connected to a second pin and a third pin of the clock chip, an eighth pin of the clock chip is connected with a power supply, a fourth pin of the clock chip is grounded, and a fifth pin, a sixth pin and a seventh pin of the clock chip are correspondingly connected with a P12 pin, a P11 pin and a P10 pin of the main control chip respectively;
the main control chip is connected with a crystal oscillator circuit through an X1 pin and an X2 pin, and the crystal oscillator circuit comprises a capacitor and a crystal oscillator;
the power supply module provides direct current voltages of different grades to the main control chip through the first voltage stabilizing module and the second voltage stabilizing module.
2. The system of claim 1, wherein: the main control chip is provided with 40 pins and is connected with a reset circuit through an RST pin, and the reset circuit comprises a resistor, a capacitor and a reset key which are electrically connected.
3. The system of claim 1, wherein: the amplification module further comprises:
one end of the resistor R1 is respectively connected with one end of the capacitor C1, one end of the resistor R4, the No. 9 pin of the main amplifier and the signal input interface; the other end of the resistor R1 is connected to the other end of the capacitor C1, one end of the resistor R2 and one end of the resistor R3 respectively;
one end of the resistor R2 is connected to one end of the resistor R1, one end of the resistor R3 and one end of the capacitor C1 respectively; the other end of the resistor R2 is connected to one end of the resistor R5 and is also connected to one end of the resistor R6;
one end of the resistor R3 is connected to one end of the capacitor C3 and is grounded; the other end of the resistor R3 is connected to one end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1 respectively;
one end of the resistor R4 is connected to the No. 4 pin of the main amplifier; the other end of the resistor R4 is respectively connected with a signal input interface, one end of a resistor R1, one end of a capacitor C1 and a No. 9 pin of the main amplifier;
one end of the resistor R5 is connected to the No. 10 pin of the main amplifier; the other end of the resistor R5 is connected to one end of the resistor R2 and is also connected to one end of the resistor R6;
one end of the resistor R6 is connected with one end of the resistor R5 and is also connected with the other end of the resistor R2; the other end of the resistor R6 is connected with the pin No. 2 of the secondary amplifier and is also connected with one end of a resistor R8;
one end of the resistor R7 is connected to the pin No. 3 of the secondary amplifier, and is also connected to one end of the resistor R9; the other end of the resistor R7 is grounded;
one end of the resistor R8 is connected with one end of the resistor R6, and is also connected with the No. 2 pin of the secondary amplifier; the other end of the resistor R8 is connected to the No. 6 pin of the sub amplifier, and is also connected to one end of a resistor R9;
one end of the resistor R9 is connected with the pin No. 6 of the secondary amplifier, and is also connected with one end of the resistor R8; the other end of the resistor R9 is connected to one end of a resistor R7 and is also connected to the No. 3 pin of the secondary amplifier;
one end of the capacitor C1 is connected to one end of the resistor R1, one end of the resistor R2 and one end of the resistor R3, respectively; the other end of the capacitor C1 is respectively connected with the other end of the resistor R1, one end of the resistor R4, the No. 9 pin of the main amplifier and the signal input interface;
one end of the capacitor C2 is connected to a +5V power supply and is also connected to the No. 11 pin of the main amplifier; the other end of the capacitor C2 is grounded;
one end of the capacitor C3 is connected to a-5V power supply and is also connected to the No. 7 pin of the main amplifier; the other end of the capacitor C3 is connected to one end of the resistor R3 and is grounded;
one end of the capacitor C4 is connected to the No. 1 pin of the main amplifier; the other end of the capacitor C4 is connected to one end of a capacitor C5 and is also connected to the No. 8 pin of the main amplifier;
one end of the capacitor C5 is connected to the No. 2 pin of the main amplifier; the other end of the capacitor C5 is connected to the No. 8 pin of the main amplifier, and is also connected to one end of a capacitor C4;
one end of the capacitor C6 is connected to the pin No. 7 of the secondary amplifier and is also connected to a +15V power supply; the other end of the capacitor C6 is grounded;
one end of the capacitor C7 is connected to the pin No. 4 of the secondary amplifier and is also connected to a-15V power supply; the other end of the capacitor C7 is grounded;
the capacitor C1 and the resistor R1 form a feedback network; the resistor R1, the resistor R2 and the resistor R3 form a T-shaped network to serve as feedback high resistance.
4. The system of claim 1, wherein: the power supply module comprises a transformer, a rectifier bridge is arranged on the secondary side of the transformer, a first voltage stabilizing chip and a second voltage stabilizing chip are arranged at the output end of the rectifier bridge, and a first diode, a second diode, a fourth diode and a fifth diode are arranged between the first voltage stabilizing chip and the second voltage stabilizing chip; the model of the first voltage stabilizing chip is LM7815, and the model of the second voltage stabilizing chip is LM 7915;
the cathode of the first diode is respectively connected to one end of a capacitor Cl2, one end of a capacitor Cl3, one end of a capacitor Cl4, the output end of the rectifier bridge and the No. 1 pin of the first voltage stabilizing chip; the positive electrode of the first diode is respectively connected with the No. 3 pin of the first voltage stabilizing chip, one end of a capacitor Cl5, a +15V power supply and the positive electrode of the second diode;
the anode of the second diode is respectively connected with the +15V power supply, the No. 3 pin of the first voltage stabilizing chip, the anode of the first diode and one end of the capacitor Cl 5; the cathode of the second diode is connected with one end of a resistor Rl7 and is also connected with the anode of a fourth diode;
the anode of the fourth diode is also connected with one end of a resistor Rl 7; the negative electrode of the fourth diode is connected with a-15V power supply and is also connected with one end of a resistor Rl 8;
the cathode of the fifth diode is respectively connected to the other end of the resistor Rl8, one end of the capacitor Cl9 and the No. 3 pin of the second voltage stabilizing chip; the anode of the fifth diode is respectively connected to one end of a capacitor Cl6, one end of a capacitor Cl7, one end of a capacitor Cl8 and the No. 1 pin of the second voltage stabilizing chip; the other end of the capacitor C16 is connected to the other end of the capacitor C12, the other end of the resistor R17 and the input end of the rectifier bridge respectively; the other end of the capacitor C17 is connected to the other end of the capacitor C14, the other end of the resistor R17 and the input end of the rectifier bridge respectively; the capacitor C18 is respectively connected to the other end of the capacitor C13, the other end of the resistor R17 and the input end of the rectifier bridge.
5. The system of claim 1, wherein: the device selection module comprises 7 key switches, which are respectively S1, S2, S3, S4, S5, S6 and S7;
one ends of the key switches S1, S2, S3, S4, S5, S6 and S7 are respectively and correspondingly connected with a P31 pin, a P32 pin, a P33 pin, a P34 pin, a P35 pin, a P36 pin and a P37 pin of the main control chip, and the other ends of the key switches S1, S2, S3, S4, S5, S6 and S7 are commonly arranged;
the key switches S1, S2, S3, S4, S5, S6, and S7 are used to access different devices.
6. The system of claim 1, wherein: the temperature module comprises a temperature detection chip, and the model of the temperature detection chip is DS18B 20;
the temperature detection chip is provided with 3 pins, a pin of the temperature detection chip is grounded, a pin III of the temperature detection chip is connected with a power supply, a pin II of the temperature detection chip is connected with a pin P21 of the main control chip, and an eleventh resistor is connected between the pin II and the pin III of the temperature detection chip.
7. The system of claim 1, wherein: the models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are all LM 712.
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