CN115268530B - Temperature acquisition system and method based on DVR series-connected silicon controlled rectifier - Google Patents
Temperature acquisition system and method based on DVR series-connected silicon controlled rectifier Download PDFInfo
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- CN115268530B CN115268530B CN202210843431.9A CN202210843431A CN115268530B CN 115268530 B CN115268530 B CN 115268530B CN 202210843431 A CN202210843431 A CN 202210843431A CN 115268530 B CN115268530 B CN 115268530B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 52
- 239000010703 silicon Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 31
- 238000007405 data analysis Methods 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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Abstract
The invention relates to a temperature acquisition system and a temperature acquisition method based on DVR series connection silicon controlled rectifier, belonging to the field of temperature control systems; a temperature acquisition system and method based on DVR series connection silicon controlled rectifier comprises: a silicon controlled unit; the thyristor unit includes: three-phase silicon controlled rectifier NTC and temperature control module; the temperature control module includes: the invention realizes real-time temperature acquisition and monitoring of the bidirectional thyristor in the dynamic voltage restorer device DVR, and the fan controls heat dissipation; the invention has the advantages that the service life of the fan is reduced, the circuit is simple, the cost is low, the energy is saved, the environment is protected, the silicon controlled rectifier is connected between the power grid and the user load in series, the temperature is monitored in real time, the stability and the safety of the system are obviously improved, the service life of the fan is prolonged, the cost of the circuit is reduced, the temperature value of the three-phase silicon controlled rectifier can be monitored by using a single-path AD port, and AD resources are reduced.
Description
Technical Field
The invention relates to a temperature acquisition system and method based on DVR series-connected thyristors, and belongs to the field of temperature control systems.
Background
Along with the increasing of the running speed, the power consumption and the temperature of the microprocessor are continuously increased, so that the processor can safely run, the reliability of the system is improved, dead halt, blue screen, repeated restarting and even processor burnout caused by overheat are prevented, and the method is not only a dilemma faced by the processor, but also an important subject faced by the design of a main board. For this reason, intel proposes a concept of a Temperature Monitor (TM) for increasing the stability and safety of the processor by performing temperature control and overheat protection on the processor.
The current temperature control modes comprise the following two modes:
1. the temperature control treatment is not carried out on the silicon controlled rectifier: forced air cooling by using a fan, namely the current air cooling;
2. sampling temperature control switch: the temperature control switch is adopted to adjust the temperature of the silicon controlled rectifier,
(1) Forced air cooling is adopted: when the current of the load end is large and the temperature of the silicon controlled rectifier is abnormal, the equipment cannot give an alarm in time, and the rear-end equipment is possibly powered off, so that the DVR function cannot be realized, and the long-time working and rerun state of the fan is also extremely consumed for the service life of the fan, and meanwhile useless power consumption is increased.
(2) The temperature control switch is adopted: by adopting the scheme, the fan can be effectively prevented from running for a long time, but the scheme can not collect and monitor the temperature of the silicon controlled rectifier in DVR equipment, and the abnormal state of the silicon controlled rectifier can not be effectively avoided.
Disclosure of Invention
The invention aims to: a temperature acquisition system and a temperature acquisition method based on DVR series-connected thyristors are provided, and the problems are solved.
The technical scheme is as follows: in a first aspect, a temperature acquisition system based on DVR series thyristors is provided, comprising:
the controllable silicon unit is connected in series between the power grid and the user load and used for monitoring the temperature in real time;
the thyristor unit includes: the temperature control module is connected with the three-phase silicon controlled rectifier NTC;
the temperature control module includes:
the signal acquisition circuit is connected with an input interface of the three-phase silicon controlled rectifier NTC by using a temperature sensor;
the input end of the conversion circuit is connected with the output end of the signal acquisition circuit, and the NTC signal is converted into a voltage signal;
the fan control circuit is used for setting a voltage threshold value according to the temperature sensor resistance curve received in the conversion circuit and controlling the fan to start and stop;
the data analysis circuit compares the voltage signals output by the conversion circuit and converts the voltage signals into digital signals to be output;
and the gating circuit is used for receiving the digital signal output by the data analysis circuit, screening out the value with the maximum temperature in the three-phase silicon controlled rectifier NTC through the digital circuit, and outputting the screened signal to the upper-level controller.
In a further embodiment, the input end of the silicon controlled rectifier unit is connected with a three-phase power supply, the output end of the silicon controlled rectifier unit is connected with an inversion unit and a load, a breaker is arranged on the three-phase power supply to protect a circuit, the input end of the inversion unit is connected with a super capacitor, the input end of the super capacitor is connected with a pre-charging unit, and the input end of the pre-charging unit is connected with the three-phase power supply.
In a further embodiment, the signal acquisition circuit comprises: the input end of the temperature sensor is connected with the input interface of the three-phase silicon controlled rectifier NTC, the temperature sensor adopts a negative temperature coefficient, a resistor R11, a resistor R21 and a resistor R31 are arranged in the temperature sensor, the higher the temperature is, the lower the resistance values of the resistor R11, the resistor R21 and the resistor R31 are, one ends of the resistor R11, the resistor R21 and the resistor R31 are grounded, and the other ends of the resistor R11, the resistor R21 and the resistor R31 are connected with the input interface of the three-phase silicon controlled rectifier NTC and output signals.
In a further embodiment, the conversion circuit comprises: diode D101, diode D102, diode D103, resistor R4, resistor R114, comparator U134-D, resistor R5; the diode D101, the diode D102 and the diode D103 are connected in parallel, the anodes are respectively input with signals, the cathodes of the diode D101, the diode D102 and the diode D103 are simultaneously connected with one end of the resistor R2 and the inverting input end of the comparator U134-D and output working voltage, the non-inverting input end of the comparator U134-D is simultaneously connected with one end of the resistor R114 and one end of the resistor R4, the other end of the resistor R2 is grounded, the other end of the resistor R4 outputs voltage, the other end of the resistor R114 is grounded, the output end of the comparator U134-D outputs signals and is connected with one end of the resistor R5, and the other end of the resistor R5 outputs voltage.
In a further embodiment, the data analysis circuit comprises: the first comparison branch, the second comparison branch and the third comparison branch; the first comparison branch circuit, the second comparison branch circuit and the third comparison branch circuit are connected in parallel;
the first comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-A are connected with the conversion circuit, the output end of the comparator U134-A is connected with one end of the resistor R12 and outputs a signal, and the other end of the resistor R12 outputs a voltage;
the second comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-B are connected with the conversion circuit, the output end of the comparator U134-B is connected with one end of the resistor R22 and outputs a signal, and the other end of the resistor R22 outputs a voltage;
the third comparison branch comprises: the non-inverting input end and the inverting input end of the comparator U134-C are connected with the conversion circuit, the output end of the comparator U134-C is connected with one end of the resistor R32 and outputs a signal, and the other end of the resistor R32 outputs a voltage.
In a further embodiment, the gating circuit includes: decoder U104, photo coupler U122, photo coupler U101, photo coupler U102, resistor R110, resistor R111, resistor R112, resistor R109, resistor R106, resistor R191, diode D104, diode D101, diode D105, diode D110, diode D108, diode D106, diode D109, diode D112, resistor R103, resistor R107, resistor R123;
the resistor R103, the resistor R107 and the resistor R123 are all connected with the decoder U104, the other end of the resistor R103 is connected with the other end of the resistor R107 and grounded, the other end of the resistor R123 outputs voltage, the signal input end of the decoder is input and connected with the output end of the data analysis circuit, the cathodes of the diode D104, the diode D101, the diode D105, the diode D110, the diode D108, the diode D106, the diode D109 and the diode D112 are all connected with the decoder U104, the positive input end of the photoelectric coupler U122 is connected with one end of the resistor R110, the negative input end of the photoelectric coupler U122 is simultaneously connected with one end of the resistor R191, the diode D110, the diode D112 and the positive electrode of the diode D106, and the other end of the resistor R191 is connected with the other end of the resistor R110 and outputs voltage;
the positive input end of the photoelectric coupler U101 is connected with one end of the resistor R111, the negative input end of the photoelectric coupler U101 is simultaneously connected with one end of the resistor R106, the positive electrodes of the diode D109 and the diode D108, and the other end of the resistor R106 is connected with the other end of the resistor R111 and outputs voltage;
the positive input end of the photoelectric coupler U102 is connected with one end of the resistor R112, the negative input end of the photoelectric coupler U102 is simultaneously connected with one end of the resistor R109, the positive electrodes of the diode D101, the diode D104 and the diode D105, and the other end of the resistor R109 is connected with the other end of the resistor R112 and outputs voltage; and signals are output in parallel between the output ends of the photoelectric coupler U122, the photoelectric coupler U101 and the photoelectric coupler U102 to the upper-level controller.
In a second aspect, a temperature collection method based on a DVR series thyristor is provided, which comprises the following steps:
step 1, power supply is electrified, a three-phase power supply is input into a silicon controlled rectifier unit through a circuit breaker, and at the moment, a three-phase silicon controlled rectifier NTC works, and then the three-phase power supply works with a temperature control module connected with the three-phase silicon controlled rectifier NTC;
in the step 2, in the signal acquisition circuit, a temperature sensor is connected with three-phase silicon controlled rectifier (NTC) input interfaces CN111, CN102 and CN101, acquires a circuit temperature value, judges the temperature according to a resistor R11, a resistor R21 and a resistor R31, and outputs an NTC signal;
step 3, inputting an NTC signal into a conversion circuit, converting the NTC signal into a voltage signal and outputting the voltage signal;
step 4, the voltage signals are simultaneously input into a data analysis circuit and a fan control circuit, and the data analysis circuit compares the voltage signals and converts the voltage signals into digital signals to be output; the fan control circuit sets a voltage threshold according to the resistance curve of the temperature sensor and controls the start and stop of the fan;
and step 5, the gating circuit receives the digital signal output by the data analysis circuit, and transmits the value with the maximum temperature in the screened three paths of three-phase thyristors NTCs to the upper-level controller through the signal acquisition channel.
In a further embodiment, since the three-phase thyristor NTC is resistive in step 3, a voltage division is formed with the resistor R11, the resistor R21, and the resistor R31, respectively, to generate the voltage signals T-C, T-B and T-a, which become larger as the temperature increases.
In a further embodiment, in step 4, the voltage signals T-C, T-B and T-a output by the conversion circuit are isolated by the diode D101, the diode D102 and the diode D103, the voltage higher in 3 points is compared with the voltage dividing signal in progress at the non-inverting input terminal of the comparator, wherein the resistor R4 and the resistor R114 divide the voltage, and when the negative voltage of the comparator U134-D is greater than the positive voltage, the fan is controlled to rotate, otherwise the fan is stopped;
meanwhile, the voltage signals T-C, T-B and T-A output by the conversion circuit are input into the data analysis circuit, and the three voltage signals are converted into logic sums 1 by the comparator U134-A, the comparator U134-B and the comparator U134-C, and three digital signals D-A, D _B and D_C are generated.
In a further embodiment, the three digital signals D-A, D _b and d_c are connected to the decoder U104 in the gate circuit, and channel allocation is performed on the output port of the decoder U104, and the working states of the photocoupler U122, the photocoupler U101 and the photocoupler U102 are controlled, so that dynamic collection is realized, and the temperature values of the three-phase thyristors are monitored and uploaded to the upper-level controller.
The beneficial effects are that: the invention relates to a temperature acquisition system and a method based on DVR series-connected silicon controlled rectifier, belonging to the field of temperature control systems; a temperature acquisition system and method based on DVR series connection silicon controlled rectifier comprises: a silicon controlled unit; the thyristor unit includes: three-phase silicon controlled rectifier NTC and temperature control module; the temperature control module includes: the invention realizes real-time temperature acquisition and monitoring of the bidirectional thyristor in the dynamic voltage restorer device DVR, and the fan controls heat dissipation; the invention has the advantages that the service life of the fan is reduced, the circuit is simple, the cost is low, the energy is saved, the environment is protected, the silicon controlled rectifier is connected between the power grid and the user load in series, the temperature is monitored in real time, the stability and the safety of the system are obviously improved, the service life of the fan is prolonged, the cost of the circuit is reduced, the temperature value of the three-phase silicon controlled rectifier can be monitored by using a single-path AD port, and AD resources are reduced.
Drawings
Fig. 1 is a schematic diagram of a thyristor-DVR system of the invention.
Fig. 2 is a functional diagram of a thyristor temperature acquisition circuit according to the present invention.
Fig. 3 is a schematic diagram of a signal acquisition circuit of the present invention.
Fig. 4 is a schematic diagram of a conversion circuit of the present invention.
Fig. 5 is a schematic diagram of a data analysis circuit of the present invention.
Fig. 6 is a schematic diagram of a gating circuit of the present invention.
Fig. 7 is a table of decoder values according to the present invention.
Fig. 8 is a logic conversion diagram of the present invention.
Fig. 9 is a flow chart of the method of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details; in other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
Example 1
As shown in fig. 2, a temperature acquisition system based on DVR series thyristors includes:
the controllable silicon unit is connected in series between the power grid and the user load and used for monitoring the temperature in real time;
the thyristor unit includes: the temperature control module is connected with the three-phase silicon controlled rectifier NTC;
the temperature control module includes:
the signal acquisition circuit is connected with an input interface of the three-phase silicon controlled rectifier NTC by using a temperature sensor;
the input end of the conversion circuit is connected with the output end of the signal acquisition circuit, and the NTC signal is converted into a voltage signal;
the fan control circuit is used for setting a voltage threshold value according to the temperature sensor resistance curve received in the conversion circuit and controlling the fan to start and stop;
the data analysis circuit compares the voltage signals output by the conversion circuit and converts the voltage signals into digital signals to be output;
and the gating circuit is used for receiving the digital signal output by the data analysis circuit, screening out the value with the maximum temperature in the three-phase silicon controlled rectifier NTC through the digital circuit, and outputting the screened signal to the upper-level controller.
In one embodiment, as shown in fig. 1, the input end of the silicon controlled rectifier unit is connected with a three-phase power supply, the output end of the silicon controlled rectifier unit is connected with an inversion unit and a load, a circuit breaker is arranged on the three-phase power supply to protect a circuit, the input end of the inversion unit is connected with a super capacitor, the input end of the super capacitor is connected with a pre-charging unit, and the input end of the pre-charging unit is connected with the three-phase power supply.
In one embodiment, as shown in fig. 3, the signal acquisition circuit includes: the input end of the temperature sensor is connected with the input interface of the three-phase silicon controlled rectifier NTC, the temperature sensor adopts a negative temperature coefficient, a resistor R11, a resistor R21 and a resistor R31 are arranged in the temperature sensor, the higher the temperature is, the lower the resistance values of the resistor R11, the resistor R21 and the resistor R31 are, one ends of the resistor R11, the resistor R21 and the resistor R31 are grounded, and the other ends of the resistor R11, the resistor R21 and the resistor R31 are connected with the input interface of the three-phase silicon controlled rectifier NTC and output signals.
In one embodiment, as shown in fig. 4, the conversion circuit includes: diode D101, diode D102, diode D103, resistor R4, resistor R114, comparator U134-D, resistor R5; the diode D101, the diode D102 and the diode D103 are connected in parallel, the anodes are respectively input with signals, the cathodes of the diode D101, the diode D102 and the diode D103 are simultaneously connected with one end of the resistor R2 and the inverting input end of the comparator U134-D and output working voltage, the non-inverting input end of the comparator U134-D is simultaneously connected with one end of the resistor R114 and one end of the resistor R4, the other end of the resistor R2 is grounded, the other end of the resistor R4 outputs voltage, the other end of the resistor R114 is grounded, the output end of the comparator U134-D outputs signals and is connected with one end of the resistor R5, and the other end of the resistor R5 outputs voltage.
In one embodiment, as shown in fig. 5, the data analysis circuit includes: the first comparison branch, the second comparison branch and the third comparison branch; the first comparison branch circuit, the second comparison branch circuit and the third comparison branch circuit are connected in parallel;
the first comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-A are connected with the conversion circuit, the output end of the comparator U134-A is connected with one end of the resistor R12 and outputs a signal, and the other end of the resistor R12 outputs a voltage;
the second comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-B are connected with the conversion circuit, the output end of the comparator U134-B is connected with one end of the resistor R22 and outputs a signal, and the other end of the resistor R22 outputs a voltage;
the third comparison branch comprises: the non-inverting input end and the inverting input end of the comparator U134-C are connected with the conversion circuit, the output end of the comparator U134-C is connected with one end of the resistor R32 and outputs a signal, and the other end of the resistor R32 outputs a voltage.
In one embodiment, as shown in fig. 6, the gating circuit includes: decoder U104, photo coupler U122, photo coupler U101, photo coupler U102, resistor R110, resistor R111, resistor R112, resistor R109, resistor R106, resistor R191, diode D104, diode D101, diode D105, diode D110, diode D108, diode D106, diode D109, diode D112, resistor R103, resistor R107, resistor R123;
the resistor R103, the resistor R107 and the resistor R123 are all connected with the decoder U104, the other end of the resistor R103 is connected with the other end of the resistor R107 and grounded, the other end of the resistor R123 outputs voltage, the signal input end of the decoder is input and connected with the output end of the data analysis circuit, the cathodes of the diode D104, the diode D101, the diode D105, the diode D110, the diode D108, the diode D106, the diode D109 and the diode D112 are all connected with the decoder U104, the positive input end of the photoelectric coupler U122 is connected with one end of the resistor R110, the negative input end of the photoelectric coupler U122 is simultaneously connected with one end of the resistor R191, the diode D110, the diode D112 and the positive electrode of the diode D106, and the other end of the resistor R191 is connected with the other end of the resistor R110 and outputs voltage;
the positive input end of the photoelectric coupler U101 is connected with one end of the resistor R111, the negative input end of the photoelectric coupler U101 is simultaneously connected with one end of the resistor R106, the positive electrodes of the diode D109 and the diode D108, and the other end of the resistor R106 is connected with the other end of the resistor R111 and outputs voltage;
the positive input end of the photoelectric coupler U102 is connected with one end of the resistor R112, the negative input end of the photoelectric coupler U102 is simultaneously connected with one end of the resistor R109, the positive electrodes of the diode D101, the diode D104 and the diode D105, and the other end of the resistor R109 is connected with the other end of the resistor R112 and outputs voltage; and signals are output in parallel between the output ends of the photoelectric coupler U122, the photoelectric coupler U101 and the photoelectric coupler U102 to the upper-level controller.
Example 2
As shown in fig. 9, a temperature collection method based on DVR series thyristors includes the following steps:
step 1, power supply is electrified, a three-phase power supply is input into a silicon controlled rectifier unit through a circuit breaker, and at the moment, a three-phase silicon controlled rectifier NTC works, and then the three-phase power supply works with a temperature control module connected with the three-phase silicon controlled rectifier NTC;
in the step 2, in the signal acquisition circuit, a temperature sensor is connected with three-phase silicon controlled rectifier (NTC) input interfaces CN111, CN102 and CN101, acquires a circuit temperature value, judges the temperature according to a resistor R11, a resistor R21 and a resistor R31, and outputs an NTC signal;
step 3, inputting an NTC signal into a conversion circuit, converting the NTC signal into a voltage signal and outputting the voltage signal;
step 4, the voltage signals are simultaneously input into a data analysis circuit and a fan control circuit, and the data analysis circuit compares the voltage signals and converts the voltage signals into digital signals to be output; the fan control circuit sets a voltage threshold according to the resistance curve of the temperature sensor and controls the start and stop of the fan;
and step 5, the gating circuit receives the digital signal output by the data analysis circuit, and transmits the value with the maximum temperature in the screened three paths of three-phase thyristors NTCs to the upper-level controller through the signal acquisition channel.
In one embodiment, as shown in fig. 3, since the three-phase thyristor NTC is resistive, in step 3, partial voltages are formed with the resistor R11, the resistor R21, and the resistor R31, respectively, to generate the voltage signals T-C, T-B and T-a, which become larger as the temperature increases.
In one embodiment, as shown in fig. 4 and 5, in step 4, the voltage signals T-C, T-B and T-a output by the conversion circuit are isolated by the diode D101, the diode D102 and the diode D103, the voltage higher in 3 points is compared with the voltage dividing signal in progress at the non-inverting input terminal of the comparator, wherein the resistor R4 and the resistor R114 divide the voltage, and when the negative voltage of the comparator U134-D is greater than the positive voltage, the fan is controlled to rotate, and conversely, the fan is stopped;
meanwhile, the voltage signals T-C, T-B and T-A output by the conversion circuit are input into the data analysis circuit, and the three voltage signals are converted into logic sums 1 by the comparator U134-A, the comparator U134-B and the comparator U134-C, and three digital signals D-A, D _B and D_C are generated.
In one embodiment, as shown in fig. 6, three digital signals D-A, D _b and d_c are connected to the decoder U104 in the gating circuit, and channel allocation is performed on the output port of the decoder U104, and the working states of the photocoupler U122, the photocoupler U101 and the photocoupler U102 are controlled, so that dynamic collection is realized, and the temperature values of the three-phase thyristors are monitored and uploaded to the upper-level controller.
In one embodiment, as shown in FIG. 8, D_A is a logic "1" when T-A > T-B and D_A is a logic "1" when T-A > T-C, which can reflect that the temperature of the SCR to which CN111 is connected is the largest, so that the circuit can generate D-A, D-B and D-C3 digital signals.
In one embodiment, as shown in fig. 7, the gating circuit screens out the value with the largest temperature in three paths of three-phase thyristors through a digital circuit, connects the screened signal acquisition channel to the upper-level controller, and connects the D-A, D-B and the D-C to the decoder U104, and the channel distribution can be carried out on the output port of the decoder U104 through the truth table of the gating circuit as shown in fig. 7 and the D-A, D-B and the D-C state diagrams, and the working states of the photoelectric coupler U122, the photoelectric coupler U101 and the photoelectric coupler U102 are controlled, so that the dynamic acquisition is realized, and the temperature values of the three-phase thyristors are monitored; examples: when the temperature of the A-phase silicon controlled rectifier is highest, the secondary side of the photoelectric coupler U122 is conducted, the CN107 and the CN103 are connected in series, and the NTC value connected with the CN103 is uploaded to the upper-level controller through the CN 107.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and these equivalent changes all fall within the scope of the present invention.
Claims (7)
1. Temperature acquisition system based on DVR series connection silicon controlled rectifier, its characterized in that includes:
the controllable silicon unit is connected in series between the power grid and the user load and used for monitoring the temperature in real time;
the thyristor unit includes: the temperature control module is connected with the three-phase silicon controlled rectifier NTC;
the temperature control module includes:
the signal acquisition circuit is connected with an input interface of the three-phase silicon controlled rectifier NTC by using a temperature sensor;
the input end of the conversion circuit is connected with the output end of the signal acquisition circuit, and the NTC signal is converted into a voltage signal;
the fan control circuit is used for setting a voltage threshold according to the resistance curve of the temperature sensor and controlling the fan to start and stop;
the data analysis circuit compares the voltage signals output by the conversion circuit and converts the voltage signals into digital signals to be output;
the gating circuit receives the digital signal output by the data analysis circuit, screens out the value with the maximum temperature in the three-phase silicon controlled rectifier NTC through the digital circuit, and outputs the screened signal to the upper-level controller;
the gating circuit includes: decoder U104, photo coupler U122, photo coupler U101, photo coupler U102, resistor R110, resistor R111, resistor R112, resistor R109, resistor R106, resistor R191, diode D104, diode D101, diode D105, diode D110, diode D108, diode D106, diode D109, diode D112, resistor R103, resistor R107, resistor R123;
the resistor R103, the resistor R107 and the resistor R123 are all connected with the decoder U104, the other end of the resistor R103 is connected with the other end of the resistor R107 and grounded, the other end of the resistor R123 outputs voltage, the signal input end of the decoder is input and connected with the output end of the data analysis circuit, the cathodes of the diode D104, the diode D101, the diode D105, the diode D110, the diode D108, the diode D106, the diode D109 and the diode D112 are all connected with the decoder U104, the positive input end of the photoelectric coupler U122 is connected with one end of the resistor R110, the negative input end of the photoelectric coupler U122 is simultaneously connected with one end of the resistor R191, the diode D110, the diode D112 and the positive electrode of the diode D106, and the other end of the resistor R191 is connected with the other end of the resistor R110 and outputs voltage;
the positive input end of the photoelectric coupler U101 is connected with one end of the resistor R111, the negative input end of the photoelectric coupler U101 is simultaneously connected with one end of the resistor R106, the positive electrodes of the diode D109 and the diode D108, and the other end of the resistor R106 is connected with the other end of the resistor R111 and outputs voltage;
the positive input end of the photoelectric coupler U102 is connected with one end of the resistor R112, the negative input end of the photoelectric coupler U102 is simultaneously connected with one end of the resistor R109, the positive electrodes of the diode D101, the diode D104 and the diode D105, and the other end of the resistor R109 is connected with the other end of the resistor R112 and outputs voltage; and signals are output in parallel between the output ends of the photoelectric coupler U122, the photoelectric coupler U101 and the photoelectric coupler U102 to the upper-level controller.
2. The temperature acquisition system based on the DVR serial thyristors according to claim 1, wherein the input end of the thyristor unit is connected with a three-phase power supply, the output end of the thyristor unit is connected with an inversion unit and a load, a circuit breaker is arranged on the three-phase power supply for protecting a circuit, the input end of the inversion unit is connected with a super capacitor, the input end of the super capacitor is connected with a pre-charging unit, and the input end of the pre-charging unit is connected with the three-phase power supply.
3. The temperature acquisition system based on DVR series thyristors as set forth in claim 2, wherein,
the signal acquisition circuit includes: the input end of the temperature sensor is connected with the input interface of the three-phase silicon controlled rectifier NTC, the temperature sensor adopts a negative temperature coefficient, a resistor R11, a resistor R21 and a resistor R31 are arranged in the temperature sensor, the higher the temperature is, the lower the resistance values of the resistor R11, the resistor R21 and the resistor R31 are, one ends of the resistor R11, the resistor R21 and the resistor R31 are grounded, and the other ends of the resistor R11, the resistor R21 and the resistor R31 are connected with the input interface of the three-phase silicon controlled rectifier NTC and output signals.
4. A temperature acquisition system based on DVR series thyristors as claimed in claim 3, wherein,
the conversion circuit includes: diode D101, diode D102, diode D103, resistor R4, resistor R114, comparator U134-D, resistor R5; the diode D101, the diode D102 and the diode D103 are connected in parallel, the anodes are respectively input with signals, the cathodes of the diode D101, the diode D102 and the diode D103 are simultaneously connected with one end of the resistor R2 and the inverting input end of the comparator U134-D and output working voltage, the non-inverting input end of the comparator U134-D is simultaneously connected with one end of the resistor R114 and one end of the resistor R4, the other end of the resistor R2 is grounded, the other end of the resistor R4 outputs voltage, the other end of the resistor R114 is grounded, the output end of the comparator U134-D outputs signals and is connected with one end of the resistor R5, and the other end of the resistor R5 outputs voltage.
5. The temperature acquisition system based on DVR series thyristors as set forth in claim 4, wherein,
the data analysis circuit includes: the first comparison branch, the second comparison branch and the third comparison branch; the first comparison branch circuit, the second comparison branch circuit and the third comparison branch circuit are connected in parallel;
the first comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-A are connected with the conversion circuit, the output end of the comparator U134-A is connected with one end of the resistor R12 and outputs a signal, and the other end of the resistor R12 outputs a voltage;
the second comparison branch includes: the non-inverting input end and the inverting input end of the comparator U134-B are connected with the conversion circuit, the output end of the comparator U134-B is connected with one end of the resistor R22 and outputs a signal, and the other end of the resistor R22 outputs a voltage;
the third comparison branch comprises: the non-inverting input end and the inverting input end of the comparator U134-C are connected with the conversion circuit, the output end of the comparator U134-C is connected with one end of the resistor R32 and outputs a signal, and the other end of the resistor R32 outputs a voltage.
6. An acquisition method using the DVR series thyristor-based temperature acquisition system of claim 5, comprising the steps of:
step 1, power supply is electrified, a three-phase power supply is input into a silicon controlled rectifier unit through a circuit breaker, and at the moment, a three-phase silicon controlled rectifier NTC works, and then the three-phase power supply works with a temperature control module connected with the three-phase silicon controlled rectifier NTC;
in the step 2, in the signal acquisition circuit, a temperature sensor is connected with three-phase silicon controlled rectifier (NTC) input interfaces CN111, CN102 and CN101, acquires a circuit temperature value, judges the temperature according to a resistor R11, a resistor R21 and a resistor R31, and outputs an NTC signal;
step 3, inputting an NTC signal into a conversion circuit, converting the NTC signal into a voltage signal and outputting the voltage signal;
step 4, the voltage signals are simultaneously input into a data analysis circuit and a fan control circuit, and the data analysis circuit compares the voltage signals and converts the voltage signals into digital signals to be output; the fan control circuit sets a voltage threshold according to the resistance curve of the temperature sensor and controls the start and stop of the fan;
step 5, the gating circuit receives the digital signal output by the data analysis circuit, and transmits the value with the maximum temperature in the screened three paths of three-phase thyristors NTCs to the upper-level controller through the signal acquisition channel;
in step 4, the voltage signals T-C, T-B and T-a output by the conversion circuit are isolated by the diode D101, the diode D102 and the diode D103, the voltage higher in 3 points is compared with the voltage dividing signal in progress at the non-inverting input end of the comparator, wherein the resistor R4 and the resistor R114 divide the voltage, and when the negative voltage of the comparator U134-D is greater than the positive voltage, the fan is controlled to rotate, otherwise the fan is stopped;
meanwhile, the voltage signals T-C, T-B and T-A output by the conversion circuit are input into the data analysis circuit, the voltage signals are converted into logic sums 1 by the comparator U134-A, the comparator U134-B and the comparator U134-C between every two of the three voltage signals, and three digital signals D-A, D _B and D_C are generated;
the three digital signals D-A, D _B and D_C are connected to the decoder U104 in the gating circuit, channel distribution is carried out on the output port of the decoder U104, and the working states of the photoelectric coupler U122, the photoelectric coupler U101 and the photoelectric coupler U102 are controlled, so that dynamic acquisition is realized, and the temperature values of the three-phase thyristors are monitored and uploaded to the upper-level controller.
7. The method of claim 6, wherein in step 3, since the three-phase thyristor NTC is resistive, voltage division is formed with the resistor R11, the resistor R21, and the resistor R31, respectively, to generate the voltage signals T-C, T-B and T-a, which become larger as the temperature increases.
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