CN114879003A - Conduction angle detection device and method of silicon controlled rectifier for textile electric control system - Google Patents
Conduction angle detection device and method of silicon controlled rectifier for textile electric control system Download PDFInfo
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- CN114879003A CN114879003A CN202210618968.5A CN202210618968A CN114879003A CN 114879003 A CN114879003 A CN 114879003A CN 202210618968 A CN202210618968 A CN 202210618968A CN 114879003 A CN114879003 A CN 114879003A
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/263—Circuits therefor for testing thyristors
Abstract
The invention relates to the technical field of silicon controlled rectifiers for textile electric control systems, in particular to a device and a method for detecting a conduction angle of a silicon controlled rectifier for a textile electric control system. A silicon controlled rectifier conduction angle detection device for a textile electric control system comprises a detection device body, an optical coupler and a control device, wherein the detection device body comprises the optical coupler which works in a saturation area or a cut-off area; a first end of the first resistor is connected with the positive electrode of the positive side of the optical coupler; the first power supply is connected with the second end of the first resistor; a first end of the second resistor is connected with a first interface end of the optical coupler secondary side; a first end of the third resistor is connected with a second interface end of the optical coupler secondary side; the first connecting interface is connected with the second end of the second resistor and is used for being connected with the first anode of the controlled silicon to be detected; and the second connection interface is connected with the second end of the third resistor and is used for being connected with the second anode of the controllable silicon to be detected. The conduction angle detection equipment and the conduction angle detection method can simply and conveniently realize the conduction angle detection of the bidirectional controllable silicon.
Description
Technical Field
The invention relates to the technical field of silicon controlled rectifiers for textile electric control systems, in particular to a device and a method for detecting a conduction angle of a silicon controlled rectifier for a textile electric control system.
Background
The thyristor is a half-controlled device, also known as a thyristor, and the input is alternating current (the period of the alternating current is 360 degrees, the positive half cycle is 180 degrees, and the negative half cycle is 180 degrees). When alternating current passes through the silicon controlled rectifier, the silicon controlled rectifier allows positive 180-degree electricity to pass (positive voltage is applied to the anode of the silicon controlled rectifier in the positive half cycle), and negative 180-degree electricity is prevented from passing. However, the thyristor does not let all the positive 180 degrees of electricity pass through, and a trigger pulse needs to be added to the control electrode of the thyristor at a certain angle of 180 degrees from the time when the positive half-cycle electricity is added to the anode of the thyristor, so that the thyristor actually starts to be switched on until the positive half-cycle is ended. The electrical angle corresponding to the non-conducting part is called a control angle, the electrical angle corresponding to the conducting part is called a conducting angle, for example, when a pulse is added at 30 degrees, the thyristor can only allow the rest 150 degrees to pass through, then the control angle is 30 degrees, and the conducting angle is 150 degrees.
The principle of the triac is similar, except that both positive 180 degrees and negative 180 degrees can pass through (a trigger pulse is also required when the negative 180 degrees passes through). The weaving electrical system needs to use the bidirectional thyristor, and the conduction angle is the key parameter of weaving electrical system with the silicon controlled rectifier, if weaving electrical system with the silicon controlled rectifier the conduction angle can not satisfy the operation requirement, then can direct influence weaving electrical system's performance. For this reason, it is desirable to be able to detect the conduction angle of the triac before it is used to determine whether the triac meets the use requirements.
However, the prior art does not have a device or method capable of detecting the conduction angle of the single bidirectional triode thyristor, the prior art can only detect the circuit system connected with the bidirectional triode thyristor generally, and the detection operation is very inconvenient.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the conduction angle detection equipment and the conduction angle detection method of the controllable silicon for the textile electric control system, which can detect the conduction angle of the single bidirectional controllable silicon and are very convenient to detect.
The technical scheme adopted by the invention for solving the technical problems is as follows: weaving is conduction angle check out test set of silicon controlled rectifier for electrical system, include
The detection equipment body comprises
The optical coupler works in a saturation region or a cut-off region;
a first end of the first resistor is connected with the positive electrode of the positive side of the optical coupler;
the first power supply is connected with the second end of the first resistor;
a first end of the second resistor is connected with a first interface end of the optical coupler secondary side;
a first end of the third resistor is connected with a second interface end of the optical coupler secondary side;
the first connecting interface is connected with the second end of the second resistor and is used for being connected with the first anode of the controlled silicon to be detected;
the second connecting interface is connected with the second end of the third resistor and is used for being connected with the second anode of the controlled silicon to be detected;
the third connecting interface is connected with the first interface end of the optocoupler secondary side and is used for being connected with the control electrode of the silicon controlled rectifier to be detected;
the load is detachably connected with the detection equipment body, and the detection equipment body further comprises a load interface connected with the second end of the second resistor;
the second power supply is detachably connected with the detection equipment body and used for providing an alternating current power supply, the detection equipment body further comprises a power supply interface connected with the second end of the third resistor, and the second power supply is connected with the load;
the PWM wave generator is detachably connected with the detection equipment body and is used for generating PWM wave with required duty ratio, and the detection equipment body also comprises a wave generator interface connected with the positive side and the negative side of the optical coupler;
the waveform display is detachably connected with the detection equipment body and used for obtaining and displaying a voltage waveform diagram between a first anode of the controllable silicon to be detected and a second anode of the controllable silicon to be detected, the detection equipment body further comprises a first display interface connected with a second end of the second resistor and used for being connected with a first detection terminal of the waveform display, and a second display interface connected with a second end of the third resistor and used for being connected with a second detection terminal of the waveform display.
Preferably, the conduction angle detecting apparatus further comprises a controller connected to the PWM wave generator, the controller including
The conduction angle detection value input unit is used for inputting the conduction angle detection value of the silicon controlled rectifier to be detected;
a duty ratio calculation unit connected to the conduction angle detection value input unit, for calculating a duty ratio required for the PWM wave based on the conduction angle detection value;
and the duty ratio adjusting unit is connected with the duty ratio calculating unit and adjusts the PWM wave generator according to the required duty ratio of the PWM wave to enable the PWM wave generator to generate the PWM wave with the corresponding duty ratio.
Preferably, the controller is further connected to the second power supply, and the controller further includes
And the period adjusting unit is used for adjusting the PWM wave so as to enable the period of the PWM wave to be synchronous with the positive/negative half period of the alternating current power supply.
Preferably, the load is a motor.
Preferably, the detection device body further comprises
A first end of the fourth resistor is connected with a second end of the second resistor;
and the anode of the capacitor is connected with the second end of the fourth resistor, and the cathode of the capacitor is connected with the second end of the third resistor.
The method for detecting the conduction angle of the silicon controlled rectifier for the textile electric control system adopts the conduction angle detection equipment and comprises the following steps
The L1 connects the first anode of the controlled silicon to be detected with the first connecting interface, connects the second anode of the controlled silicon to be detected with the second connecting interface, and connects the control electrode of the controlled silicon to be detected with the third connecting interface;
l2 turns on a PWM wave generator to generate a PWM wave, turns on a second power supply to generate an ac power, and aligns the PWM wave such that a period of the PWM wave is synchronized with a positive/negative half period of the ac power;
l3 determining the conduction angle detection value of the silicon controlled rectifier to be detected, determining the required duty ratio of the PWM wave according to the conduction angle detection value, and adjusting the PWM wave generator according to the required duty ratio of the PWM wave to enable the PWM wave generator to generate the PWM wave with the corresponding duty ratio;
the method comprises the steps that an L4 waveform display obtains and displays a voltage waveform diagram between a first anode of the controlled silicon to be detected and a second anode of the controlled silicon to be detected, and the conduction angle condition of the controlled silicon to be detected is determined through the voltage waveform diagram;
l5 judges whether the conduction angle detection of the current silicon controlled rectifier to be detected is finished, if yes, the conduction angle detection is finished; otherwise, return to L3.
Preferably, the L2 is specifically configured to adjust the PWM wave by a period adjustment unit so that the period of the PWM wave is synchronized with the positive/negative half period of the ac power source.
Preferably, said L3 specifically comprises,
l31 inputs the conduction angle detection value of the silicon controlled rectifier to be detected through the conduction angle detection value input unit;
l32 calculating the required duty ratio of PWM wave by a duty ratio calculating unit according to the conduction angle detection value;
l33 passes through the duty ratio regulating unit and adjusts the PWM wave generator according to the required duty ratio of the PWM wave to generate the PWM wave with the corresponding duty ratio.
Preferably, L4 specifically includes
L41, when the voltage amplitude in the voltage waveform diagram is 0 or the voltage amplitude fluctuation is obvious, judging that the conduction angle is abnormal, and entering L5; otherwise, go to L42;
l42 calculates the actual value of the conduction angle of the silicon controlled rectifier to be detected according to the voltage waveform diagram, and calculates the delay value of the conduction angle according to the actual value of the conduction angle and the detection value of the conduction angle, when the delay value of the conduction angle is in the allowable range, the conduction angle is judged to be normal; otherwise, judging that the conduction angle is abnormal.
Preferably, a maximum voltage amplitude reference line and a minimum voltage amplitude reference line for assisting in determining whether or not the voltage amplitude fluctuation is significant are provided in the voltage waveform diagram.
Advantageous effects
The conduction angle detection equipment and the conduction angle detection method can form a trigger signal for triggering the conduction of the silicon controlled rectifier to be detected through the first power supply, the first resistor, the optocoupler and the PWM wave generator in a simulation mode, can form a detection circuit allowing the silicon controlled rectifier to be detected to be conducted in two directions through the second resistor, the third resistor, the load and the second power supply, can obtain a voltage waveform diagram through the waveform display to determine whether the current detection conduction angle of the silicon controlled rectifier to be detected is normal or abnormal, and then can detect the conduction angle of a single bidirectional silicon controlled rectifier very simply and conveniently.
Drawings
Fig. 1 is a circuit connection diagram of a conduction angle detection device of a controllable silicon for a textile electric control system.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example 1: as shown in figure 1, the silicon controlled rectifier conduction angle detection device for the textile electric control system comprises a detection device body, a load 6, a second power supply 8, a PWM wave generator 4 and a waveform display.
The detection device body comprises a shell body, a circuit board is arranged inside the shell body, a first connecting interface, a second connecting interface, a third connecting interface, a load interface, a power interface, a waveform generator interface, a first display interface and a second display interface are arranged on the shell body.
The circuit board includes opto-coupler 1, first resistance 2, first power 3, second resistance 5 and third resistance 7. The optical coupler 1 works in a saturation region or a cut-off region and plays a role of a switch. The first end of the first resistor 2 is connected with the positive electrode of the positive side of the optical coupler 1, and the resistance value of the first resistor may be 330 Ω. The first power supply 3 is connected to the second end of the first resistor 2 and may be 3.3V. The first end of the second resistor 5 is connected with the first interface end of the secondary side of the optical coupler 1, and the resistance value of the second resistor may be 100 Ω. The first end of the third resistor 7 is connected with the second interface end of the secondary side of the optocoupler 1, and the resistance value of the third resistor may be 100 Ω.
The first connection interface is connected with the second end of the second resistor 5 and is used for being connected with the first anode of the controllable silicon 9 to be detected. And the second connection interface is connected with the second end of the third resistor 7 and is used for being connected with the second anode of the controllable silicon 9 to be detected. And the third connecting interface is connected with the first interface end of the secondary side of the optocoupler 1 and is used for being connected with the control electrode of the controllable silicon 9 to be detected.
The load 6 with the check out test set body dismantles the formula and is connected, just the check out test set body be equipped with the load interface that the second end of second resistance 5 is connected, load 6 passes through load interface and this body coupling of check out test set. In this embodiment, the load 6 is a motor, and may be a torque motor or a roller motor. The load 6 can be connected with the load interface of the detection equipment body without being detached for a long time.
The second power supply 8 is detachably connected with the detection device body and used for providing alternating current power supply, and the second power supply 8 can be 110V alternating current. The detection device body is provided with a power interface connected with the second end of the third resistor 7, the second power supply 8 is connected with the detection device body through the power interface, and the second power supply 8 is also connected with the load 6. The second power supply 8 is connected with the power interface of the detection device body and the load 6, and then is not detached for a long time.
The PWM wave generator 4 is detachably connected with the detection equipment body and used for generating PWM wave forms with required duty ratios, and the detection equipment body is provided with a wave form generator interface connected with a positive negative electrode of the optocoupler 1. PWM wave generator 4 passes through waveform generator interface and is connected with the check out test set body, and PWM wave generator 4 need not dismantle for a long time after being connected with the check out test set body. In this embodiment, when the PWM wave is at a high level, the light emitting diode on the positive side of the optocoupler 1 is not turned on, and therefore the secondary side of the optocoupler 1 is also not turned on; when the PWM wave is at a low level, the light emitting diode on the positive side of the optical coupler 1 is switched on, so that the secondary side of the optical coupler 1 is also switched on simultaneously. In this embodiment, in one period of the PWM wave, the front part is set to high level, the rear part is set to low level, and at the moment of switching from high level to low level, the circuits of the second resistor 5 and the third resistor 7 are turned on due to the conduction of the secondary side of the optocoupler 1, so that the control electrode of the control silicon 9 to be detected has trigger current. In one period, the proportion of the high level in the whole period is the duty ratio of the PWM wave, and the secondary side of the optocoupler 1 can be controlled to be switched on by adjusting the duty ratio, so that the time for providing trigger current for the control electrode of the control silicon 9 to be detected can be controlled.
The waveform display is detachably connected with the detection equipment body and used for obtaining and displaying a voltage waveform diagram between a first anode of the controllable silicon 9 to be detected and a second anode of the controllable silicon 9 to be detected, and the detection equipment body is provided with a first display interface which is connected with a second end of the second resistor 5 and used for being connected with a first detection terminal of the waveform display, and a second display interface which is connected with a second end of the third resistor 7 and used for being connected with a second detection terminal of the waveform display. The first detection terminal of the waveform display is connected with the detection equipment body through the first display interface, the second detection terminal of the waveform display is connected with the detection equipment body through the second display interface, and the first detection terminal and the second detection terminal are not required to be detached for a long time after being connected.
Before the specific detection of the conduction angle of the silicon controlled rectifier 9 to be detected, it is necessary to determine the conduction angle (i.e. the detected value of the conduction angle, which is assumed to be 135 degrees, there may be a plurality of conduction angle detected values) of the silicon controlled rectifier 9 to be detected which needs to be used in the textile electric control system, and then the corresponding control angle should be 45 degrees, so that a trigger current needs to be provided for the silicon controlled rectifier 9 to be detected when the positive half period or the negative half period of the alternating current power supply is 45 degrees. In addition, the period of the PWM wave is consistent with the positive half period or the negative half period of the alternating current power supply, and when the positive half period (or the negative half period) of the alternating current power supply begins, the period of the PWM wave begins; at the end of the positive half cycle (or negative half cycle) of the ac power source, the PWM wave cycle ends. When the control angle of the thyristor 9 to be detected is 45 degrees, the control angle accounts for 25% of the positive half cycle (or the negative half cycle) of the alternating-current power supply, so that the PWM wave needs to be converted into high and low levels at the position of 25%, and the duty ratio of the PWM wave can be determined to be 25%.
The specific detection process of the conduction angle of the silicon controlled rectifier 9 to be detected is as follows: the PWM wave generator 4 is turned on first and the PWM wave generator 4 is adjusted to generate a PWM wave having a high level in the first half and a low level in the second half and a duty ratio of 25%, and the second power supply 8 is turned on at the same time. When the second power supply 8 is in a positive half cycle, the second anode of the thyristor 9 to be detected is in a positive voltage, and the first anode is in a negative voltage. When the PWM wave is converted from a high level to a low level, the secondary side of the optocoupler 1 is conducted, and at the moment, the circuits of the second resistor 5 and the third resistor 7 are conducted to provide a trigger current for the control electrode of the silicon controlled rectifier 9 to be detected, so that the second anode of the silicon controlled rectifier 9 to be detected is conducted with the first anode, and the load 6 works. When the second power supply 8 is in a negative half cycle, the first anode of the thyristor 9 to be detected is in a positive voltage, and the second anode is in a negative voltage. When the PWM wave is converted from a high level to a low level, the secondary side of the optocoupler 1 is conducted, and at the moment, the circuits of the second resistor 5 and the third resistor 7 are conducted to provide a trigger current for the control electrode of the silicon controlled rectifier 9 to be detected, so that the first anode and the second anode of the silicon controlled rectifier 9 to be detected are conducted, and the load 6 works.
And then, a voltage waveform chart between the first anode of the controlled silicon 9 to be detected and the second anode of the controlled silicon 9 to be detected is checked through the waveform display. If the voltage amplitude of the voltage waveform diagram is 0, it indicates that the first anode and the second anode of the controlled silicon 9 to be detected are not conducted, and the conduction angle detected by the controlled silicon 9 to be detected correspondingly is problematic and abnormal. If the voltage waveform diagram has voltage amplitude, but the voltage amplitude fluctuates greatly up and down, the conduction angle detected by the thyristor 9 to be detected is still problematic and abnormal. If the voltage waveform diagram has voltage amplitude and the voltage amplitude does not fluctuate greatly, the conduction delay condition of the conduction angle needs to be further determined.
The conduction delay condition can be determined by firstly determining the proportion of voltage waveforms with voltage amplitudes not being 0 in a voltage waveform diagram, multiplying 180 degrees to obtain a conduction angle actual value, subtracting the conduction angle actual value from a conduction angle detection value to obtain a conduction angle delay difference value, dividing the conduction angle delay difference value by 180 degrees and multiplying the conduction angle delay difference value by a half-period time value to obtain a final conduction angle delay value, if the conduction angle delay value exceeds an allowable range, it is determined that the conduction angle detected by the silicon controlled rectifier 9 to be detected is problematic and abnormal, and if the conduction angle delay value is within the allowable range, it is determined that the conduction angle detected by the silicon controlled rectifier 9 to be detected is normal.
After the current conduction angle of the silicon controlled rectifier 9 to be detected is detected, it can be considered that other conduction angles do not need to be detected, and if the conduction angles need to be detected, the duty ratio of the PWM wave is determined and adjusted according to a new conduction angle detection value. If not, the silicon controlled rectifier 9 to be detected is detached from the first connection interface, the second connection interface and the third connection interface, and then other silicon controlled rectifiers 9 to be detected are replaced.
Further, the conduction angle detection device further comprises a controller connected with the PWM wave generator 4, and the controller comprises a conduction angle detection value input unit, a duty ratio calculation unit and a duty ratio adjustment unit.
The conduction angle detection value input unit is used for inputting the conduction angle detection value of the silicon controlled rectifier 9 to be detected, and after the conduction angle detection value of the silicon controlled rectifier 9 to be detected is determined (determined according to the use requirement of the textile electric control system), a worker inputs the conduction angle detection value into the controller through the conduction angle detection value input unit. For example, the conduction angle detection value may be 90 degrees.
The duty ratio calculation means is connected to the conduction angle detection value input means, and calculates a required duty ratio of the PWM wave based on the conduction angle detection value. When the conduction angle detection value is 90 degrees, the required duty ratio of the PWM wave calculated is 50%.
The duty ratio adjusting unit is connected with the duty ratio calculating unit, and adjusts the PWM wave generator 4 according to the required duty ratio of the PWM wave to enable the PWM wave generator to generate the PWM wave with the corresponding duty ratio. When the required duty ratio of the PWM wave is 50%, the duty ratio adjusting unit can automatically control the output waveform of the PWM wave generator 4 to make it output a PWM waveform with a duty ratio of 50%.
The arrangement of the conduction angle detection value input unit, the duty ratio calculation unit and the duty ratio regulation unit ensures that on one hand, a worker only needs to input the conduction angle detection value without manually calculating the duty ratio and manually regulating the PWM wave generator 4, so that the detection operation of the silicon controlled rectifier conduction angle is simpler and more convenient; on the other hand, compared with the manual duty ratio calculation and manual duty ratio adjustment, the duty ratio is calculated through the duty ratio calculation unit, and the duty ratio is adjusted through the duty ratio adjustment unit, so that the accuracy of the output PWM wave is higher, and the detection accuracy of the conduction angle is higher.
Further, the controller is further connected to the second power supply 8, and the controller further includes a period adjustment unit. In the process of detecting the conduction angle, the period of the PWM wave needs to be synchronous with the positive half period or the negative half period of the alternating current power supply, and the period of the PWM wave is difficult to be synchronous with the positive/negative half period of the alternating current power supply by manually adjusting the PWM wave. The embodiment automatically adjusts the PWM wave through the period adjusting unit so that the period of the PWM wave is synchronous with the positive/negative half period of the alternating current power supply, the convenience of the detection operation of the conduction angle of the controlled silicon is further improved, the adjusting accuracy is higher, and the detection accuracy of the conduction angle is further improved.
Further, as shown in fig. 1, the detection apparatus body further includes a fourth resistor 10 and a capacitor 11. A first end of the fourth resistor 10 is connected to a second end of the second resistor 5, wherein the resistance of the fourth resistor 10 is 100 Ω. The anode of the capacitor 11 is connected to the second terminal of the fourth resistor 10, the cathode of the capacitor 11 is connected to the second terminal of the third resistor 7, and the value of the capacitor 11 is 100 nF. In this embodiment, the two ends of the silicon controlled rectifier 9 to be detected are connected in parallel with the RC resistor and capacitor, and the characteristic that the voltage at the two ends of the capacitor cannot change suddenly is used to limit the voltage rise rate at the two ends of the silicon controlled rectifier 9 to be detected, so as to protect the silicon controlled rectifier 9 to be detected.
The conduction angle detection equipment of this embodiment can at first form the trigger signal that is used for triggering to wait to detect silicon controlled rectifier 9 and switches on through the simulation of first power 3, first resistance 2, opto-coupler 1 and PWM wave generator 4, and trigger signal's production time can be through the duty cycle adaptability regulation that changes the PWM ripples, and then can detect the conduction angle that the silicon controlled rectifier is arbitrary required to be detected.
And secondly, a detection circuit which allows the thyristor 9 to be detected to be conducted in two directions can be formed through the second resistor 5, the third resistor 7, the load 6 and the second power supply 8, and an indispensable zero-crossing detection circuit of the thyristor under the condition of unidirectional conduction is omitted. When detecting the conduction angle of the bidirectional thyristor, it is also possible to detect only a single conduction direction, but in that case, the periodic alternation of positive voltage and negative voltage does not occur at the two ends of the thyristor 9 to be detected, and then the automatic closing of the thyristor 9 to be detected cannot be realized (namely, the thyristor 9 to be detected can be closed only when the half period is detected to be ended by the zero-crossing detection circuit), and the whole detection circuit is very complicated by setting the zero-crossing detection circuit.
And finally, a voltage waveform diagram between the first anode of the controlled silicon to be detected and the second anode of the controlled silicon to be detected can be obtained and displayed through the waveform display, and the current detected conduction angle of the controlled silicon to be detected can be determined to be normal or abnormal very simply and conveniently through the voltage waveform diagram.
Example 2: as shown in fig. 1, a method for detecting a conduction angle of a thyristor for a textile electrical control system, which adopts the conduction angle detection device in embodiment 1, specifically includes the following steps
The L1 connects the first anode of the thyristor to be detected with the first connection interface, connects the second anode of the thyristor to be detected with the second connection interface, and connects the control electrode of the thyristor to be detected with the third connection interface.
L2 turns on PWM wave generator 4 to generate PWM waves, turns on second power supply 8 to generate ac power, and aligns the PWM waves to synchronize their periods with the positive/negative half cycles of the ac power.
The L2 is specifically configured to adjust the PWM wave by a period adjustment unit to synchronize the period of the PWM wave with the positive/negative half-cycles of the ac power source. In the process of detecting the conduction angle, the period of the PWM wave needs to be synchronous with the positive half period or the negative half period of the alternating current power supply, and the period of the PWM wave is difficult to be synchronous with the positive/negative half period of the alternating current power supply by manually adjusting the PWM wave. The embodiment automatically adjusts the PWM wave through the period adjusting unit so that the period of the PWM wave is synchronous with the positive/negative half period of the alternating current power supply, the convenience of the detection operation of the conduction angle of the controlled silicon is further improved, the adjusting accuracy is higher, and the detection accuracy of the conduction angle is further improved.
L3 determines the conduction angle detection value of the silicon controlled rectifier 9 to be detected, determines the required duty ratio of the PWM wave according to the conduction angle detection value, and adjusts the PWM wave generator 4 according to the required duty ratio of the PWM wave to enable the PWM wave to generate the PWM wave with the corresponding duty ratio.
The L3 specifically includes that L31 inputs the conduction angle detection value of the to-be-detected silicon controlled rectifier 9 through the conduction angle detection value input unit, and after the conduction angle detection value of the to-be-detected silicon controlled rectifier 9 is determined (determined according to the use requirement of the textile electric control system), the worker inputs the conduction angle detection value into the controller through the conduction angle detection value input unit. For example, the conduction angle detection value may be 90 degrees. L32 calculates the required duty ratio of the PWM wave by the duty ratio calculation unit based on the conduction angle detection value, and when the conduction angle detection value is 90 degrees, the calculated required duty ratio of the PWM wave is 50%. L33 regulates the PWM wave generator 4 by means of a duty cycle regulating unit and according to the required duty cycle of the PWM wave so that it generates a PWM wave of the corresponding duty cycle. When the required duty ratio of the PWM wave is 50%, the duty ratio adjusting unit can automatically control the output waveform of the PWM wave generator 4 to make it output a PWM waveform with a duty ratio of 50%.
The arrangement of the conduction angle detection value input unit, the duty ratio calculation unit and the duty ratio regulation unit ensures that on one hand, a worker only needs to input the conduction angle detection value without manually calculating the duty ratio and manually regulating the PWM wave generator 4, so that the detection operation of the silicon controlled rectifier conduction angle is simpler and more convenient; on the other hand, compared with the manual duty ratio calculation and manual duty ratio adjustment, the duty ratio is calculated through the duty ratio calculation unit, and the duty ratio is adjusted through the duty ratio adjustment unit, so that the accuracy of the output PWM wave is higher, and the detection accuracy of the conduction angle is higher.
And the L4 waveform display acquires and displays a voltage waveform diagram between the first anode of the controlled silicon 9 to be detected and the second anode of the controlled silicon 9 to be detected, and the conduction angle condition of the controlled silicon to be detected is determined according to the voltage waveform diagram.
When the second power supply 8 is in a positive half cycle, the second anode of the thyristor 9 to be detected is in a positive voltage, and the first anode is in a negative voltage. When the PWM wave is converted from a high level to a low level, the secondary side of the optocoupler 1 is conducted, and at the moment, the circuits of the second resistor 5 and the third resistor 7 are conducted to provide a trigger current for the control electrode of the silicon controlled rectifier 9 to be detected, so that the second anode of the silicon controlled rectifier 9 to be detected is conducted with the first anode, and the load 6 works. When the second power supply 8 is in a negative half cycle, the first anode of the thyristor 9 to be detected is in a positive voltage, and the second anode is in a negative voltage. When the PWM wave is converted from a high level to a low level, the secondary side of the optocoupler 1 is conducted, and at the moment, the circuits of the second resistor 5 and the third resistor 7 are conducted to provide a trigger current for the control electrode of the silicon controlled rectifier 9 to be detected, so that the first anode and the second anode of the silicon controlled rectifier 9 to be detected are conducted, and the load 6 works.
The L4 specifically comprises L41, when the voltage amplitude in the voltage waveform diagram is 0 or the voltage amplitude fluctuation is obvious, the conduction angle is judged to be abnormal, and the L5 is entered; otherwise, L42 is entered. If the voltage amplitude of the voltage waveform diagram is 0, it indicates that the first anode and the second anode of the controlled silicon 9 to be detected are not conducted, and the conduction angle detected by the controlled silicon 9 to be detected correspondingly is problematic and abnormal. If the voltage waveform diagram has voltage amplitude, but the voltage amplitude fluctuates greatly up and down, the conduction angle detected by the thyristor 9 to be detected is still problematic and abnormal. In addition, the present embodiment may provide a maximum voltage amplitude reference line and a minimum voltage amplitude reference line for assisting in determining whether or not voltage amplitude fluctuation is significant in the voltage waveform diagram. When the sum of the times that the voltage waveform is higher than the maximum voltage amplitude reference line and the times that the voltage waveform is lower than the minimum voltage amplitude reference line is larger than a set times value, the voltage amplitude fluctuation is obvious.
L42 calculates the actual value of the conduction angle of the silicon controlled rectifier 9 to be detected according to the voltage waveform diagram, and calculates the delay value of the conduction angle according to the actual value of the conduction angle and the detection value of the conduction angle, when the delay value of the conduction angle is in the allowable range, the conduction angle is judged to be normal; otherwise, judging that the conduction angle is abnormal. If the voltage waveform diagram has voltage amplitude and the voltage amplitude fluctuation is not obvious, the conduction delay condition of the conduction angle needs to be further determined. The conduction delay condition can be determined by firstly determining the proportion of voltage waveforms with voltage amplitudes not being 0 in a voltage waveform diagram, multiplying 180 degrees to obtain a conduction angle actual value, subtracting the conduction angle actual value from a conduction angle detection value to obtain a conduction angle delay difference value, dividing the conduction angle delay difference value by 180 degrees and multiplying the conduction angle delay difference value by a half-period time value to obtain a final conduction angle delay value, if the conduction angle delay value exceeds an allowable range, it is determined that the conduction angle detected by the silicon controlled rectifier 9 to be detected is problematic and abnormal, and if the conduction angle delay value is within the allowable range, it is determined that the conduction angle detected by the silicon controlled rectifier 9 to be detected is normal.
L5 judges whether the current conduction angle detection of the silicon controlled rectifier 9 to be detected is finished, if so, the conduction angle detection is finished; otherwise, return to L3. When the current conduction angle detection of the thyristor 9 to be detected is finished, it can be considered that other conduction angles do not need to be detected, if necessary, the circuit returns to L3 to determine and adjust the duty ratio of the PWM wave according to a new conduction angle detection value. If not, the silicon controlled rectifier 9 to be detected is detached from the first connection interface, the second connection interface and the third connection interface, and then other silicon controlled rectifiers 9 to be detected are replaced.
According to the conduction angle detection method, firstly, a trigger signal for triggering the conduction of the silicon controlled rectifier 9 to be detected can be formed through simulation of the first power supply 3, the first resistor 2, the optocoupler 1 and the PWM wave generator 4, the generation time of the trigger signal can be adaptively adjusted by changing the duty ratio of the PWM wave, and then any conduction angle required to be detected of the silicon controlled rectifier can be detected.
And secondly, a detection circuit which allows the thyristor 9 to be detected to be conducted in two directions can be formed through the second resistor 5, the third resistor 7, the load 6 and the second power supply 8, and an indispensable zero-crossing detection circuit of the thyristor under the condition of unidirectional conduction is omitted. When detecting the conduction angle of the bidirectional thyristor, it is also possible to detect only a single conduction direction, but in that case, the periodic alternation of positive voltage and negative voltage does not occur at the two ends of the thyristor 9 to be detected, and then the automatic closing of the thyristor 9 to be detected cannot be realized (namely, the thyristor 9 to be detected can be closed only when the half period is detected to be ended by the zero-crossing detection circuit), and the whole detection circuit is very complicated by setting the zero-crossing detection circuit.
And finally, a voltage waveform diagram between the first anode of the controlled silicon to be detected and the second anode of the controlled silicon to be detected can be obtained and displayed through the waveform display, and the current detected conduction angle of the controlled silicon to be detected can be determined to be normal or abnormal very simply and conveniently through the voltage waveform diagram.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. The utility model provides a weaving is conduction angle check out test set of silicon controlled rectifier for electrical system which characterized in that: comprises that
The detection equipment body comprises
An optical coupler (1) operating in a saturation region or a cut-off region;
the first end of the first resistor (2) is connected with the positive electrode of the positive side of the optocoupler (1);
a first power supply (3) connected to a second end of the first resistor (2);
a first end of the second resistor (5) is connected with a first interface end of the secondary side of the optical coupler (1);
a first end of the third resistor (7) is connected with a second interface end of the secondary side of the optical coupler (1);
the first connecting interface is connected with the second end of the second resistor (5) and is used for being connected with a first anode of the controllable silicon (9) to be detected;
the second connection interface is connected with the second end of the third resistor (7) and is used for being connected with the second anode of the controllable silicon (9) to be detected;
the third connecting interface is connected with the first interface end of the secondary side of the optocoupler (1) and is used for being connected with a control electrode of the controllable silicon (9) to be detected;
the load (6) is detachably connected with the detection equipment body, and the detection equipment body further comprises a load interface connected with the second end of the second resistor (5);
the second power supply (8) is detachably connected with the detection equipment body and used for providing an alternating current power supply, the detection equipment body further comprises a power supply interface connected with the second end of the third resistor (7), and the second power supply (8) is connected with the load (6);
the PWM wave generator (4) is detachably connected with the detection equipment body and is used for generating PWM wave forms with required duty ratios, and the detection equipment body further comprises a wave form generator interface connected with a positive side negative electrode of the optocoupler (1);
the waveform display is detachably connected with the detection equipment body and used for obtaining and displaying a voltage waveform diagram between a first anode of the controllable silicon (9) to be detected and a second anode of the controllable silicon (9) to be detected, and the detection equipment body further comprises a first display interface connected with a second end of the second resistor (5) and used for being connected with a first detection terminal of the waveform display, and a second display interface connected with a second end of the third resistor (7) and used for being connected with a second detection terminal of the waveform display.
2. The silicon controlled rectifier conduction angle detection device for the textile electric control system as claimed in claim 1, wherein: the conduction angle detection apparatus further comprises a controller connected with the PWM wave generator (4), the controller including
The conduction angle detection value input unit is used for inputting the conduction angle detection value of the silicon controlled rectifier (9) to be detected;
a duty ratio calculation unit connected to the conduction angle detection value input unit, for calculating a duty ratio required for the PWM wave based on the conduction angle detection value;
and the duty ratio adjusting unit is connected with the duty ratio calculating unit and is used for adjusting the PWM wave generator (4) according to the required duty ratio of the PWM wave so as to generate the PWM wave with the corresponding duty ratio.
3. The silicon controlled rectifier conduction angle detection device for the textile electric control system as claimed in claim 2, characterized in that: the controller is also connected with the second power supply (8), and the controller also comprises
And the period adjusting unit is used for adjusting the PWM wave so as to enable the period of the PWM wave to be synchronous with the positive/negative half period of the alternating current power supply.
4. The silicon controlled rectifier conduction angle detection device for the textile electric control system as claimed in claim 1, wherein: the load (6) is a motor.
5. The silicon controlled rectifier conduction angle detection device for the textile electric control system as claimed in claim 1, wherein: the detection equipment body also comprises
A fourth resistor (10) having a first end connected to a second end of the second resistor (5);
and the anode of the capacitor (11) is connected with the second end of the fourth resistor (10), and the cathode of the capacitor (11) is connected with the second end of the third resistor (7).
6. A conduction angle detection method of a controlled silicon for a textile electric control system, which adopts the conduction angle detection device of any one of claims 1 to 5, and is characterized in that: comprises the following steps
The L1 connects the first anode of the controlled silicon to be detected with the first connecting interface, connects the second anode of the controlled silicon to be detected with the second connecting interface, and connects the control electrode of the controlled silicon to be detected with the third connecting interface;
l2 turns on a PWM wave generator (4) to generate PWM waves, turns on a second power supply (8) to generate AC power, and adjusts the PWM waves to synchronize the period of the PWM waves with the positive/negative half cycle of the AC power;
l3 determining the conduction angle detection value of the silicon controlled rectifier (9) to be detected, determining the required duty ratio of the PWM wave according to the conduction angle detection value, and adjusting the PWM wave generator (4) according to the required duty ratio of the PWM wave to enable the PWM wave generator to generate the PWM wave with the corresponding duty ratio;
the method comprises the steps that an L4 waveform display acquires and displays a voltage waveform diagram between a first anode of a silicon controlled rectifier (9) to be detected and a second anode of the silicon controlled rectifier (9) to be detected, and the conduction angle condition of the silicon controlled rectifier to be detected is determined through the voltage waveform diagram;
l5 judges whether the current conduction angle detection of the silicon controlled rectifier (9) to be detected is finished, if yes, the conduction angle detection is finished; otherwise, return to L3.
7. The method for detecting the conduction angle of the controlled silicon for the textile electric control system as claimed in claim 6, characterized in that: the L2 is specifically configured to adjust the PWM wave by a period adjustment unit to synchronize the period of the PWM wave with the positive/negative half-cycles of the ac power source.
8. The method for detecting the conduction angle of the controlled silicon for the textile electric control system according to claim 6, is characterized in that: the L3 specifically includes a list of,
l31 inputs the conduction angle detection value of the silicon controlled rectifier (9) to be detected through the conduction angle detection value input unit;
l32 calculating the required duty ratio of PWM wave by a duty ratio calculating unit according to the conduction angle detection value;
l33 regulates the PWM wave generator (4) by a duty cycle regulating unit according to the required duty cycle of the PWM wave to generate a PWM wave with a corresponding duty cycle.
9. The method for detecting the conduction angle of the controlled silicon for the textile electric control system according to claim 6, is characterized in that: said L4 specifically comprises
L41, when the voltage amplitude in the voltage waveform diagram is 0 or the voltage amplitude fluctuation is obvious, judging that the conduction angle is abnormal, and entering L5; otherwise, go to L42;
l42 calculates the actual value of the conduction angle of the silicon controlled rectifier (9) to be detected according to the voltage waveform diagram, and calculates the delay value of the conduction angle according to the actual value of the conduction angle and the detection value of the conduction angle, when the delay value of the conduction angle is in the allowable range, the conduction angle is judged to be normal; otherwise, judging that the conduction angle is abnormal.
10. The method for detecting the conduction angle of the controlled silicon for the textile electric control system according to claim 9, is characterized in that: and arranging a maximum voltage amplitude reference line and a minimum voltage amplitude reference line for assisting in judging whether the voltage amplitude fluctuation is obvious or not in the voltage waveform diagram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210618968.5A CN114879003A (en) | 2022-06-02 | 2022-06-02 | Conduction angle detection device and method of silicon controlled rectifier for textile electric control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210618968.5A CN114879003A (en) | 2022-06-02 | 2022-06-02 | Conduction angle detection device and method of silicon controlled rectifier for textile electric control system |
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| Publication Number | Publication Date |
|---|---|
| CN114879003A true CN114879003A (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210618968.5A Pending CN114879003A (en) | 2022-06-02 | 2022-06-02 | Conduction angle detection device and method of silicon controlled rectifier for textile electric control system |
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| Country | Link |
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| CN (1) | CN114879003A (en) |
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- 2022-06-02 CN CN202210618968.5A patent/CN114879003A/en active Pending
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