CN115327440A - Program-controlled alternating current short circuit control system and method - Google Patents
Program-controlled alternating current short circuit control system and method Download PDFInfo
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- CN115327440A CN115327440A CN202211057939.2A CN202211057939A CN115327440A CN 115327440 A CN115327440 A CN 115327440A CN 202211057939 A CN202211057939 A CN 202211057939A CN 115327440 A CN115327440 A CN 115327440A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
A program control alternating current short circuit control system and method comprises a frequency multiplication phase-locked circuit, a reference phase setting module, a short circuit time setting module, a short circuit type setting module and a control unit; the reference phase setting module is connected with an alternating current power supply; the output signal of the reference phase setting module is connected with a frequency multiplication phase-locked circuit, and the frequency multiplication phase-locked circuit performs short-circuit protection at any equal division of the single cycle of the alternating voltage waveform; the output of the frequency multiplication phase-locked circuit is connected with a short-circuit time setting module, the short-circuit time setting module is provided with a special programmable capacitor, and the short-circuit time is controlled by adjusting the capacitance value of the capacitor; the invention can be set at any time; the short circuit type can be adjusted; various short circuit triggering modes can be selected; the numerical control can be completely realized remotely; after the AC short circuit occurs, the automatic reset can be realized, and the protection can be actively carried out; the method is used for testing and verifying the protection condition of the SSPC on the circuit under the complex condition, so that the circuit is protected, and the reliable and uninterrupted operation of the airplane is ensured.
Description
Technical Field
The invention belongs to the field of alternating current short circuit control, and particularly relates to a program control alternating current short circuit control system and method.
Background
With the rapid development and application of multi/full electric technology in aviation, chariot, ship and related commercial fields, the number and types of electric equipment increase dramatically, the electrical load characteristic curves of all the electric equipment of the whole machine are very different, and various power distribution equipment comes out endlessly, such as: particularly, with the continuous progress of electric power technology and computer technology, a Solid State Power Controller (SSPC) gradually replaces the traditional devices to realize overload and short circuit protection of a power supply line of the whole equipment, and further improves the reliability and safety of power distribution of the whole equipment.
Most of the existing short-circuit tests of the SSPC directly short circuit the ground, the interphase short-circuit tests are few, only the interphase short-circuit tests cannot select short-circuit points in an alternating-current voltage cycle, and the short-circuit is often uncontrollable, so that the SSPC short-circuit tests are greatly influenced, on one hand, the test contents are incomplete, and on the other hand, the SSPC is easily damaged after the short-circuit occurs. This presents higher requirements and challenges for testing of ac power distribution equipment. ,
disclosure of Invention
The present invention provides a program-controlled ac short circuit control system and method to solve the above problems.
In order to realize the purpose, the invention adopts the following technical scheme:
a program control alternating current short circuit control system comprises a frequency multiplication phase locking circuit, a reference phase setting module, a short circuit time setting module, a short circuit type setting module and a control unit; the reference phase setting module is connected with an alternating current power supply and used for selecting any phase in A, B, C phases of the alternating current power supply as a reference voltage; the output signal of the reference phase setting module is connected with a frequency multiplication phase-locked circuit, and the frequency multiplication phase-locked circuit performs short-circuit protection at any equi-division position of the single cycle of the alternating voltage waveform; the output of the frequency multiplication phase-locked circuit is connected with a short-circuit time setting module, the short-circuit time setting module is provided with a special programmable capacitor, and the short-circuit time is controlled by adjusting the capacitance value of the capacitor; the short circuit time setting module is connected with the short circuit type setting module, the short circuit type setting module is used for simulating short circuit faults of any phase voltage to the ground and short circuit faults between any phase and phases, and the alternating current power supply is connected with the short circuit type setting module; the short-circuit time setting module, the short-circuit type setting module and the reference phase setting module are all connected to the control unit, the control unit is used for controlling the frequency multiplication phase-locked circuit and the short-circuit time setting module to count, short-circuit type selection is achieved, and when the count value of the short-circuit time setting module is equal to a set value, short circuit is triggered.
Furthermore, the frequency multiplication phase-locked circuit comprises a logic phase-locked loop and a frequency divider, the output signal of the reference phase setting module is connected with the input end of the logic phase-locked loop, and the phase-locked loop outputs clock pulses to the counter.
Furthermore, the short-circuit moment setting module comprises a counter, a comparator, a trigger and an IO expansion chip which are connected with the frequency doubling phase-locked circuit, the counter, the comparator and the trigger are sequentially connected, and the control unit is connected with the comparator through the IO expansion chip; the counter and the reset end of the trigger are connected with the control unit through IO to carry out starting control.
Furthermore, the trigger is connected with an adjustable resistor Rtx and a programmable capacitor Crx.
Further, the short circuit type setting module comprises an IO expansion chip, a logic circuit, a power switch and a driving circuit; the logic circuit, the driving circuit and the power switch are sequentially connected to form a group of type settings, the plurality of groups of type settings are all connected to the IO expansion chip, the IO expansion chip is connected with the control unit, and the power switch is connected with the alternating current power supply; the logic circuit is connected with the trigger of the short-circuit moment setting module.
Furthermore, the reference phase setting module comprises a rectifier bridge, an isolation optocoupler and a logic circuit, an alternating current power supply input is connected with the isolation optocoupler after passing through the rectifier bridge, an output end of the isolation optocoupler is connected with the logic circuit, and the control unit is connected with the logic circuit through an IO expansion chip.
Furthermore, a communication control interface is arranged on the control unit and used for receiving instructions of the upper computer.
Further, a control method of the program-controlled alternating current short circuit control system comprises the following steps:
after the power is switched on, an alternating current power supply is input into a rectifier bridge circuit at the front end of the reference phase setting functional module, the rectifier bridge circuit converts alternating current into direct current, the direct current is output to an isolation optocoupler, an electric signal is output to one input end of a logic circuit and a gate, the other input end of the logic circuit and the gate is connected with a control unit through an IO expansion chip, and the reference phase setting is completed according to an instruction of an upper computer;
after the setting of one out of three of the reference phases is finished, a frequency doubling phase locking module consisting of a phase-locked loop and a binary ripple counter divides one period into n pulse signals and outputs the n pulse signals to a rear-end short-circuit moment control module to finish the function of frequency doubling phase locking;
the output pulses of the frequency multiplication phase locking module are accumulated by a counter and output to a comparator, the input end of the comparator is connected with the control unit through an IO expansion chip, the short-circuit moment is set through an upper computer instruction, and when the set value is equal to the counting value, the comparator outputs a level signal trigger to act; and the counter and the reset end of the trigger are connected with the control unit through IO, and are started and controlled through the upper computer, so that short circuit time setting is completed.
The short circuit moment setting module trigger acts to output an electric signal to one input end of the logic circuit AND gate, the other input end of the logic circuit AND gate is connected with the control unit through an IO expansion chip, and any driving circuit is controlled through the logic circuit according to an instruction of an upper computer to drive the rear-end power switch to complete short circuit type selection;
through the selection of the size of the capacitor, the short circuit is automatically reset and ended when the short circuit occurs to the corresponding moment, and the active protection of the device is realized.
Compared with the prior art, the invention has the following technical effects:
the invention can realize the adjustment of the short circuit type by the I/O output of the remote numerical control unit of the upper computer, and can meet all interphase short circuit types and ground short circuit tests; selecting a reference phase through a phase-locked loop, comparing the reference phase with a preset numerical value by adopting a frequency division counting method, and sending a short-circuit signal when the frequency division counting value is equal to the preset numerical value to realize that the short-circuit time can be set; the short circuit time can be controlled by adjusting the capacitance value, and the cross-linked power supply is automatically cut off after the set time of the AC short circuit, so that the SSPC and the rear-stage load equipment are prevented from being damaged.
Drawings
Fig. 1 is a circuit architecture diagram of an ac short circuit control device.
Fig. 2 is an electrical connection diagram of the semiconductor power switch and an ac power input.
Detailed Description
In order to make the method objects, technical solutions and advantages of the embodiments of the present invention more clear. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the present invention and are not limited to the contents constituting the present invention. Variations and modifications of the method and embodiments based on the present invention are also possible and are within the scope of the present invention.
A program-controlled AC short circuit control system and method includes: frequency multiplication phase-locked circuit, reference phase setting, short circuit time setting, short circuit type setting and control unit.
A method of zero-crossing detection and phase-locked frequency multiplication is utilized to equally divide the unit period of the alternating current signal into 256 parts, and a control unit is utilized to set the numerical value of the short-circuit time to be compared with the numerical value of a counter, so that short-circuit protection is realized at any (1/256) equal division of the single period of the alternating current voltage waveform. The resolution ratio can reach 1/256/T (T is the period of the alternating voltage signal), for example, when T =1/f =1/400Hz =1.25ms, the resolution ratio is 1/256/1/25=3.125 ‰.
The frequency multiplication phase-locked circuit can realize short-circuit protection at any (1/256) equal parts of the single cycle of the alternating voltage waveform through the modes of frequency multiplication phase locking and counting comparison.
The reference phase setting module can select any one of three phases of an alternating current power supply A, B, C as a reference voltage.
A short circuit time setting module for setting a special programmable capacitor C rx The active short-circuit protection is realized by adjusting the capacitance value of the capacitor and controlling the short-circuit occurrence time. After the short circuit is triggered, manual intervention is not needed, and the safety is good.
The short-circuit type setting can simulate any phase voltage to ground short-circuit fault and any phase to phase short-circuit fault.
After receiving a short-circuit instruction of an upper computer, the control unit controls the frequency multiplication phase locking and short-circuit time setting module to count; the drive circuit is controlled by the I/O expansion chip to realize the selection of the short circuit type. And triggering short circuit when the count value of the short circuit time setting module is equal to the set value.
The communication control interface is provided with a dual-redundancy communication bus, so that communication with external equipment is realized, and reliable data interaction and remote control are realized.
The invention divides the unit period of the alternating current signal into 256 equal parts by using a method of combining zero-crossing detection with phase-locked frequency multiplication, but the invention is not limited to 256 equal parts of the single period of the alternating voltage waveform, and the other frequency division conditions are still applicable.
The control unit is connected with the short-circuit type setting module for remote control so as to output an electric signal to control the driving circuit to realize the selection of the short-circuit type.
The driving circuit is connected with the controlled end of the semiconductor power switch which is used as a short circuit generator to realize six types of alternating current short circuit which can occur.
A CPU with more abundant resources can be selected as a control unit, and an I/O expansion chip is not needed.
The reference phase selection module and the short circuit type setting module comprise a plurality of AND gate logic devices so as to control subsequent circuits according to different triggering modes.
The reference phase setting module comprises a rectifier bridge, an isolation optocoupler and a logic circuit, an alternating current power supply input is connected with the isolation optocoupler after passing through the rectifier bridge, an output end of the isolation optocoupler is connected with the logic circuit, and the control unit is connected with the logic circuit through an IO expansion chip.
The frequency multiplication phase-locked module comprises a logic phase-locked loop and a binary ripple counter, the output signal of the reference phase setting module is connected with the input end of the logic phase-locked loop, and the phase-locked loop outputs clock pulses to the counter.
The short-circuit moment setting module comprises a counter connected with the frequency doubling phase-locked circuit, and the comparator is connected with the counter and the trigger and is connected with the control unit through an IO expansion chip; the counter and the reset end of the trigger are connected with the control unit through IO to carry out starting control.
The short circuit type setting module comprises a logic circuit which is connected with the control unit through an IO extended chip and is connected with the trigger together, the rear end of the logic circuit is connected into a driving circuit, and the output end of the driving circuit is connected into a power switch.
After the device controls the AC short circuit, the device automatically resets to finish the short circuit when the short circuit occurs to the corresponding moment through selecting the size of the capacitor, thereby realizing the active protection of the device
Referring to fig. 1: after the power-on, an alternating current power supply inputs a reference phase to set a rectifier bridge circuit at the front end of the functional module, the rectifier bridge circuit converts alternating current into direct current, the direct current is output to an isolation optocoupler, an electric signal is output to one input end of a logic circuit and a gate, the other input end of the isolation optocoupler is connected with a control unit through an IO (input/output) expansion chip, and the reference phase setting can be completed according to an instruction of an upper computer.
After the setting of one of the three reference phases is completed, a frequency doubling phase locking module consisting of a phase-locked loop and a binary ripple counter divides one period into 256 pulse signals and outputs the pulse signals to a rear-end short-circuit time control module to complete the function of frequency doubling phase locking.
The output pulses of the frequency multiplication phase locking module are accumulated by a counter and output to a comparator, the input end of the comparator is connected with the control unit through an IO expansion chip, the short-circuit moment can be set through an upper computer instruction, and when the set value is equal to the counting value, the comparator outputs a level signal trigger to act. And the counter and the reset end of the trigger are connected with the control unit through IO, and can be started and controlled through the upper computer, so that short circuit time setting is completed.
The short circuit time setting module trigger acts to output an electric signal to one input end of the logic circuit AND gate, the other input end of the logic circuit AND gate is connected with the control unit through the IO expansion chip, and any driving circuit can be controlled through the logic circuit according to an instruction of an upper computer to drive the rear-end power switch to complete short circuit type selection.
By selecting the size of the capacitor, the short circuit is automatically reset and ended when the short circuit occurs to the corresponding moment, and active protection of the device can be realized.
Referring to fig. 2, the semiconductor power switches are respectively connected with three phases of an input of an alternating current power supply and a ground wire, and all six types of interphase short circuit which may appear on the machine are simulated in a common mode, such as the situations of an AB interphase short circuit, an AC interphase short circuit, a BC interphase short circuit, a relative ground short circuit, B relative ground short circuit and C relative ground short circuit.
Claims (8)
1. A program-controlled alternating current short circuit control system is characterized by comprising a frequency doubling phase-locked circuit, a reference phase setting module, a short circuit time setting module, a short circuit type setting module and a control unit; the reference phase setting module is connected with an alternating current power supply and used for selecting any phase in A, B, C phases of the alternating current power supply as a reference voltage; the output signal of the reference phase setting module is connected with a frequency multiplication phase-locked circuit, and the frequency multiplication phase-locked circuit performs short-circuit protection at any equal division of the single cycle of the alternating voltage waveform; the output of the frequency multiplication phase-locked circuit is connected with a short-circuit time setting module, the short-circuit time setting module is provided with a special programmable capacitor, and the short-circuit time is controlled by adjusting the capacitance value of the capacitor; the short-circuit time setting module is connected with the short-circuit type setting module, the short-circuit type setting module is used for simulating short-circuit faults of any phase voltage to the ground and short-circuit faults between any phase and phases, and the alternating-current power supply is connected with the short-circuit type setting module; the short-circuit time setting module, the short-circuit type setting module and the reference phase setting module are all connected to the control unit, the control unit is used for controlling the frequency multiplication phase-locked circuit and the short-circuit time setting module to count, short-circuit type selection is achieved, and when the count value of the short-circuit time setting module is equal to a set value, short circuit is triggered.
2. The programmable ac short-circuit control system according to claim 1, wherein the frequency-doubling phase-locked circuit comprises a logic phase-locked loop and a frequency divider, the output signal of the reference phase setting module is connected to the input terminal of the logic phase-locked loop, and the phase-locked loop outputs the clock pulse to the counter.
3. The program-controlled alternating-current short-circuit control system according to claim 2, wherein the short-circuit time setting module comprises a counter, a comparator, a trigger and an IO expansion chip, the counter, the comparator and the trigger are connected with the frequency doubling phase-locked circuit, the counter, the comparator and the trigger are sequentially connected, and the control unit is connected with the comparator through the IO expansion chip; the counter and the reset end of the trigger are connected with the control unit through IO to carry out starting control.
4. The programmable AC short-circuit control system according to claim 3, characterized in that the trigger is connected with an adjustable resistor Rtx and a programmable capacitor Crx.
5. The program-controlled alternating-current short-circuit control system according to claim 3, wherein the short-circuit type setting module comprises an IO expansion chip, a logic circuit, a power switch and a driving circuit; the logic circuit, the driving circuit and the power switch are sequentially connected to form a group of type settings, the plurality of groups of type settings are all connected to the IO expansion chip, the IO expansion chip is connected with the control unit, and the power switch is connected with the alternating current power supply; the logic circuit is connected with the trigger of the short-circuit moment setting module.
6. The program-controlled alternating current short circuit control system according to claim 1, wherein the reference phase setting module comprises a rectifier bridge, an isolation optocoupler and a logic circuit, an alternating current power input is connected with the isolation optocoupler after passing through the rectifier bridge, an output end of the isolation optocoupler is connected with the logic circuit, and the control unit is connected with the logic circuit through an IO expansion chip.
7. The program-controlled alternating-current short-circuit control system according to claim 1, wherein the control unit is provided with a communication control interface for receiving an instruction of an upper computer.
8. A control method of a program-controlled ac short-circuit control system, based on any one of claims 1 to 7, comprising the steps of:
after the power is switched on, an alternating current power supply is input into a rectifier bridge circuit at the front end of the reference phase setting functional module, the rectifier bridge circuit converts alternating current into direct current, the direct current is output to an isolation optocoupler, an electric signal is output to one input end of a logic circuit and a gate, the other input end of the logic circuit and the gate is connected with a control unit through an IO expansion chip, and the reference phase setting is completed according to an instruction of an upper computer;
after the setting of one out of three of the reference phases is finished, a frequency doubling phase locking module consisting of a phase-locked loop and a binary ripple counter divides one period into n pulse signals and outputs the n pulse signals to a rear-end short-circuit moment control module to finish the function of frequency doubling phase locking;
the output pulses of the frequency multiplication phase locking module are accumulated by a counter and output to a comparator, the input end of the comparator is connected with the control unit through an IO expansion chip, the short-circuit moment is set through an upper computer instruction, and when the set value is equal to the counting value, the comparator outputs a level signal trigger to act; the counter and the reset end of the trigger are connected with the control unit through IO, and start control is carried out through the upper computer, so that short circuit time setting is completed;
the short circuit moment setting module trigger acts to output an electric signal to one input end of the logic circuit AND gate, the other input end of the logic circuit AND gate is connected with the control unit through an IO expansion chip, and any driving circuit is controlled through the logic circuit according to an instruction of an upper computer to drive the rear-end power switch to complete short circuit type selection;
through the selection of the size of the capacitor, the short circuit is automatically reset and finished when the short circuit occurs to the corresponding moment, and the active protection of the device is realized.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116759A (en) * | 2015-08-27 | 2015-12-02 | 南京航空航天大学 | Mixed signal state machine simulation model of AC solid state power controller |
| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
| US20200089183A1 (en) * | 2018-09-18 | 2020-03-19 | Texas Instruments Incorporated | Binary Digital Input Module Having Comparator and Isolated Output |
| CN113098238A (en) * | 2021-04-07 | 2021-07-09 | 岳阳东瑞电气有限公司 | Digital accurate three-phase synchronous signal acquisition and phase-shifting triggering method |
| CN213750720U (en) * | 2021-01-15 | 2021-07-20 | 毛维杰 | Intelligent program-controlled power supply device applied to simulation device |
| CN217213005U (en) * | 2021-12-15 | 2022-08-16 | 珠海派诺科技股份有限公司 | Test system and device of semiconductor short-circuit protector |
-
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- 2022-08-30 CN CN202211057939.2A patent/CN115327440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116759A (en) * | 2015-08-27 | 2015-12-02 | 南京航空航天大学 | Mixed signal state machine simulation model of AC solid state power controller |
| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
| US20200089183A1 (en) * | 2018-09-18 | 2020-03-19 | Texas Instruments Incorporated | Binary Digital Input Module Having Comparator and Isolated Output |
| CN213750720U (en) * | 2021-01-15 | 2021-07-20 | 毛维杰 | Intelligent program-controlled power supply device applied to simulation device |
| CN113098238A (en) * | 2021-04-07 | 2021-07-09 | 岳阳东瑞电气有限公司 | Digital accurate three-phase synchronous signal acquisition and phase-shifting triggering method |
| CN217213005U (en) * | 2021-12-15 | 2022-08-16 | 珠海派诺科技股份有限公司 | Test system and device of semiconductor short-circuit protector |
Non-Patent Citations (1)
| Title |
|---|
| 刘素英;梁军;孟昭勇;: "电力系统短路故障控制器的研究", 山东大学学报(工学版), no. 04, 31 December 1993 (1993-12-31) * |
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