A safe power supply control method based on electric power drag course practice

Abstract

The present application relates to a kind of safety power supply control method based on electric power drag course practical training, including three-phase safety power supply, self-checking system, external inspection system and control circuit, self-checking system and external inspection system are electrically connected respectively the output end of three-phase safety power supply, the present application is equipped with self-checking system and external inspection system, and by control circuit control entire three-phase safety power supply and self-checking system, external inspection system, before student practical training, self-checking system can save a lot of manpower to confirm the working condition of three-phase safety power supply, when safety power supply fails, it can be promptly repaired, external inspection system is equipped with safety mode and monitoring mode, safety mode is safety power supply, monitoring mode is normal power supply, from the control mode method of safety power supply, it can improve work efficiency and remove security risks, can also guarantee that trainee forms safety concept and good operation habit in operation process, provides relevant practical training process information.

Description

Technical Field

[0001] This invention relates to the field of electric drive technology, specifically a safe power supply control method based on electric drive course training. Background Technology

[0002] In vocational high school electric drive training courses, installing and debugging circuits requires live operation. These situations are usually completed under the supervision of teachers or other specialized personnel to ensure personal safety. However, with multiple students but only one or two teachers, it is difficult to meet the needs of all students in a timely manner. This leads to problems such as low efficiency and safety hazards when installing and debugging circuits. A safe three-phase power supply and test motor set for electric drive courses (Publication No.: CN219512380U, Publication Date: 2023-08-11) provides a safe three-phase power supply that can supply power at different voltages.

[0003] A safe three-phase power supply and test motor set for electric drive courses includes a three-phase voltage regulator, a transformer, and an adjustable output circuit unit. The three-phase voltage regulator is electrically connected to the transformer. The transformer has a high-voltage output terminal, a low-voltage output terminal, and a safety voltage output terminal. The high-voltage output terminal and the low-voltage output terminal are electrically connected to the adjustable output circuit unit. The adjustable output circuit unit includes a high-voltage branch and a low-voltage branch. The high-voltage branch and the low-voltage branch are connected in parallel and then connected in series with a current transformer. The end of the current transformer away from the adjustable output circuit unit is the power output terminal.

[0004] This utility model provides students with a safe test power supply by supplying different voltages through a transformer and an adjustable output circuit unit; at the same time, it matches the test motor group of the safe test power supply to improve teaching efficiency and quality. This utility model mainly proposes the structure of the safe power supply, but does not provide a control method. This invention, however, proposes a safe power supply control method based on this utility model. Summary of the Invention

[0005] To address the technical deficiencies in the background technology, this invention proposes a safe power supply control method based on electric drive course training, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A safety power supply control method based on electric drive course training includes a three-phase safety power supply, a self-testing system, an external testing system, and a control circuit. The self-testing system and the external testing system are electrically connected to the output terminals of the three-phase safety power supply. The control circuit is electrically connected to the three-phase safety power supply, the self-testing system, and the external testing system. The three-phase safety power supply has a main output circuit and a 36V power output terminal. The main output circuit has three-phase high-voltage output terminals and three-phase low-voltage output terminals. The high-voltage output terminals are connected to a high-voltage high-current circuit and a high-voltage low-current circuit. The low-voltage output terminals are connected to a low-voltage high-current circuit. Each phase of the high-voltage output terminal has a high-voltage low-current detection circuit, a combined resistor, a first fast switch, and a first switch. Each phase of the low-voltage output terminal has a power electronic switch and a second switch. The output current of the main output circuit has a first set value and a second set value. The 36V power output terminal has a second fast switch and a current detection module. The output current of the 36V power output terminal has a third set value. The external inspection system has a safety mode and a monitoring mode. The safety mode is in a high voltage and low current output state and a low voltage and high current output state. The monitoring mode is in a high voltage and high current output state. The monitoring mode is equipped with a detection circuit. The three-phase safety power supply is equipped with an information recording system. The control method comprises the following steps: Step 1: Start the three-phase safety power supply; Step 2: Run the self-test system and enter self-test mode; Step 2.1: Check whether the high voltage output terminal and the combined resistor are operating normally, and the range of high voltage and low current output; Step 2.2: Check whether the low-voltage output terminal and the power electronic switch are operating normally, and check whether the power electronic switch can quickly turn off when an overcurrent condition occurs during the low-voltage output state; Step 2.3: Check whether the high voltage output terminal and the first fast switch are operating normally, and check whether the first fast switch can quickly turn off or whether the current enters a constant current state when the high voltage output state is detected to be in an overcurrent state. Step 2.4: The information recording system records the detection time and detection data; Step 3: The three-phase safety power supply enters the external inspection state; Step 3.1: The three-phase safety power supply enters the safety mode of external inspection. Step 3.1.1: It is detected that the continuous output current of the 36V power supply exceeds the third set value and the three-phase safety power supply outputs high voltage and low current; Step 3.1.2: The low-voltage high-current circuit enters the working state while the power electronic switch is turned on; Step 3.1.3: Detect the output current at the low-voltage output terminal. If an overcurrent is detected, quickly turn off the power electronic switch. Step 3.1.4: After the low-voltage output terminal has been running for a set time, the three-phase safety power supply will automatically disconnect. Step 3.1.5: The information recording system records the operation results and monitoring signals; Step 3.2: The three-phase safety power supply enters the monitoring mode of external inspection status; Step 3.2.1: The three-phase safety power supply verifies the guardian's information, and the detection circuit operates and continuously detects whether the guardian is in the monitoring position; Step 3.2.2: Manually turn on the high-voltage, high-current circuit; Step 3.2.3: The high-voltage, high-current circuit enters the working state and simultaneously turns on the first fast switch. If a phase loss is detected, an alarm is triggered. Step 3.2.4: Detect the output current of the high-voltage output terminal. If an overcurrent is detected, turn off the first fast switch and trigger an alarm; or do not turn off the fast switch and enter a constant current state and trigger an alarm. Step 3.2.5: The information recording system records the results of the operation and the monitoring signals.

[0006] As a further technical solution of the present invention, the self-test system in step 2 above is equipped with a self-test circuit synchronized with the control circuit. The self-test circuit is equipped with a three-phase full-bridge rectifier circuit with three bridge arms. Each phase output terminal of the three-phase safety power supply is connected to one bridge arm of the three-phase full-bridge rectifier circuit. The DC output terminal of the three-phase full-bridge rectifier circuit is respectively connected to the first detection branch, the second detection branch, and the third detection branch. The first detection branch is equipped with a first load and a first detection switch. The second detection branch is equipped with a second load and a second detection switch. The third detection branch is equipped with a third load and a third detection switch.

[0007] As a further technical solution of the present invention, in step 2.1, the first detection switch is turned on to detect both ends of the first detection branch and obtain the range of high voltage and low current; in step 2.2, the second detection switch is turned on to detect both ends of the second detection branch and obtain the waveform of low voltage and high current; in step 2.3, the third detection switch is turned on to detect both ends of the third detection branch and obtain the waveform of high voltage and high current.

[0008] As a further technical solution of the present invention, in step 2.2 above, the overcurrent protection value of low voltage and high current is adjusted and set as the first set value; in step 2.3 above, the overcurrent protection value of high voltage and high current is adjusted and set as the second set value; the first set value is greater than the second set value; in step 3.2.5 above, if the overcurrent exceeds the first set value, the first fast switch is turned off and an alarm is triggered; in step 3.2.5 above, if the overcurrent exceeds the second set value, the first fast switch is not turned off and enters a constant current state, and an alarm is triggered.

[0009] As a further technical solution of the present invention, the combined resistor in step 2.1 above is composed of a resistor parallel switch assembly, a resistor and a high voltage low current detection circuit connected in series, and the resistor parallel switch assembly and the resistor are provided in several quantities.

[0010] As a further technical solution of the present invention, in step 2.3 above, the first fast switch and the first switch of each phase are connected in series to form a branch, and the branch of each phase is connected in parallel with the combined resistor.

[0011] As a further technical solution of the present invention, if any of the steps 2 to 3.2.4 above cannot operate normally, the three-phase safety power supply will display a fault point.

[0012] As a further technical solution of the present invention, the detection circuit in steps 3.2.1 to 3.2.5 above controls whether the three-phase safety power supply is turned off by detecting whether the person is in a monitoring position.

[0013] As a further technical solution of the present invention, the main output circuit is provided with a plurality of output ports, each of which is connected to a motor assembly.

[0014] As a further technical solution of the present invention, the output terminal of the three-phase safety power supply is connected to the motor set, the motor set includes a test motor, a normal motor and a motor set detection circuit system arranged in parallel, and is provided with a motor set detection mode. The motor set is connected to the external detection system of the three-phase safety power supply through the motor set detection circuit system, and a switch is provided between the output terminal of the three-phase safety power supply and the motor set. The detection safety mode of the external detection circuit system of the motor set is synchronized with the safety mode of the three-phase safe power supply, and the detection monitoring mode of the external detection circuit system of the motor set is synchronized with the monitoring mode of the three-phase safe power supply. The operation process of the motor set is as follows: Step 1: The motor set is connected to the external testing system through the output terminal of the three-phase safety power supply, or by adding multiple output ports to the output terminal of the three-phase safety power supply. The motor set detection circuit system can automatically identify the connection status of the test motor and the normal motor. Step 2: After the user confirms safety, the motor set detection circuit system enters the working state, the three-phase safety power supply enters the motor set detection mode, starts the motor set connected to the external detection system, and starts running; Step 3: The three-phase safety power supply operates in the motor set detection safety mode; Step 3.1: After receiving the start command, the external test circuit system of the motor set turns on the switch, and the test motor starts. The three-phase safety power supply external detection system monitors relevant data. If a fault such as overcurrent or phase loss occurs, the three-phase safety power supply will shut down the output, record the data, and sound an alarm. Step 3.2: The external inspection circuit system of the motor set also records relevant data and displays the fault point; Step 4: The three-phase safety power supply operates in the motor set detection and monitoring mode; Step 4.1: The three-phase safety power supply operates in the motor set detection and monitoring mode. When the switch is turned on, the motor will start with reduced voltage and current limiting until full voltage output. If a phase loss, overcurrent during full voltage output, or failure to output full voltage after reaching the set start time occurs, the three-phase safety power supply will shut off the output, record the data, and sound an alarm. Step 4.2: Simultaneously, the external detection circuit system of the motor set also records relevant data and displays the fault point; Step 5: The motor unit exits the detection mode.

[0015] The beneficial effects of this invention are as follows: This invention features a self-testing system and an external testing system, with the entire three-phase safety power supply and these systems controlled by a control circuit. Before student training, the self-testing system saves significant manpower in verifying the working status of the three-phase safety power supply. It also allows for timely repairs in case of power supply malfunctions. The external testing system includes a safety mode and a monitoring mode. The safety mode ensures safe power supply, while the monitoring mode ensures normal power supply. This approach to power supply control not only improves work efficiency and eliminates safety hazards but also ensures that trainees develop safety awareness and good operating habits during operation.

[0016] Before operation, the monitoring mode requires the identification of the guardian. At the same time, the detection circuit detects whether the person is in the monitoring position throughout the process, and then controls whether the three-phase power supply is turned off. This frees the teacher from the role of safety assurance and improves the quality and efficiency of teaching to a new level.

[0017] This invention can add multiple output ports and matching motor sets at the output end, and equip them with an output controller, enabling one three-phase safety power supply to control multiple motor sets. At the same time, it can make appointments for output, allowing students to make appointments in advance and make preparations. The equipment can be disconnected at regular intervals to regulate the students' experimental time, thereby improving the efficiency of the safety power supply and reducing the purchase cost. Attached Figure Description

[0018] Figure 1 This is a system framework diagram of a safe power supply control method based on electric drive course training.

[0019] Figure 2 This is an embodiment of a three-phase safety power supply control method based on electric drive course training.

[0020] Figure 3 This is an embodiment of a self-testing system for a safety power control method based on electric drive course training.

[0021] Figure 4 This is an embodiment of a combined resistor for a safety power supply control method based on electric drive course training.

[0022] Figure 5 This is an embodiment of a safe power supply control method for motor sets based on electric drive course training. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-5 The embodiments of the present invention will be described in conjunction with related examples. The embodiments of the present invention are not limited to the following examples, and the relevant necessary components of the present invention should be regarded as well-known technology in the field of this art, which can be known and mastered by those skilled in the art.

[0024] This invention is a safety power supply control method based on a three-phase safety power supply circuit, such as... Figure 1 As shown, the three-phase safety power supply includes a three-phase voltage regulator and a transformer. The three-phase output terminals of the three-phase voltage regulator and the input terminals of the transformer are electrically connected respectively. The transformer has a three-phase high-voltage output terminal and a low-voltage output terminal, and the transformer has a 36V power output terminal.

[0025] This invention relates to a safety power supply control method based on electric drive course training, including a three-phase safety power supply, a self-testing system, an external testing system, and a control circuit. The self-testing system and the external testing system are electrically connected to the output terminals of the three-phase safety power supply, respectively. The control circuit is electrically connected to the three-phase safety power supply, the self-testing system, and the external testing system. The three-phase safety power supply has a main output circuit and a 36V power output terminal. The main output circuit has a three-phase high-voltage output terminal and a three-phase low-voltage output terminal. The high-voltage output terminal is connected to a high-voltage high-current circuit and a high-voltage low-current circuit, and the low-voltage output terminal is connected to a low-voltage high-current circuit.

[0026] like Figure 1As shown, the three-phase safety power supply contains a transformer. The three-phase high-voltage output terminal of the transformer is the same component as the three-phase high-voltage output terminal of the three-phase safety power supply, the three-phase low-voltage output terminal of the transformer is the same component as the three-phase low-voltage output terminal of the three-phase safety power supply, and the 36V power output terminal of the transformer is the same component as the 36V power output terminal of the three-phase safety power supply, but with different descriptions.

[0027] Each phase high voltage output terminal is equipped with a high voltage low current detection circuit, a combined resistor, a first fast switch and a first switch. Each phase low voltage output terminal is equipped with a power electronic switch and a second switch. The output current of the main output circuit is equipped with a first set value and a second set value. The 36V power output terminal is equipped with a second fast switch and a current detection module. The output current of the 36V power output terminal is equipped with a third set value.

[0028] The external inspection system has a safety mode and a monitoring mode. In safety mode, it is in a high voltage and low current output state and a low voltage output state. In monitoring mode, it is in a high voltage output state. The monitoring mode is equipped with a detection circuit. The three-phase safety power supply is equipped with an information recording system.

[0029] This invention features a self-testing system and an external testing system, with the entire three-phase safety power supply and these systems controlled by a control circuit. Before student training, the self-testing system saves significant manpower in verifying the working status of the three-phase safety power supply. It also allows for timely repairs in case of power supply malfunctions. The external testing system includes a safety mode and a monitoring mode. The safety mode ensures safe power supply, while the monitoring mode ensures normal power supply. This approach to power supply control not only improves work efficiency and eliminates safety hazards but also ensures that trainees develop safety awareness and good operating habits during operation.

[0030] The steps of the control method are as follows: Step 1: Start the three-phase safety power supply; Step 2: Run the self-test system and enter self-test mode; Step 2.1: Check whether the high voltage output terminal and the combined resistor are operating normally, and the range of high voltage and low current output; Step 2.2: Check whether the low-voltage output terminal and the power electronic switch are operating normally, and check whether the power electronic switch can quickly turn off when an overcurrent condition occurs during the low-voltage output state. Step 2.3: Check whether the high voltage output terminal and the first fast switch are operating normally, and check whether the first fast switch can quickly turn off or whether the current enters a constant current state when an overcurrent condition occurs during the high voltage output state. Step 2.4: The information recording system records the detection time and detection data. Step 3: The three-phase safety power supply enters the external inspection state; Step 3.1: The three-phase safety power supply enters the safety mode of external inspection. Step 3.1.1: It is detected that the continuous output current of the 36V power supply exceeds the third set value and the three-phase safety power supply outputs high voltage and low current; Step 3.1.2: The low-voltage, high-current circuit enters the working state and the power electronic switch is turned on simultaneously; Step 3.1.3: Detect the output current at the low-voltage output terminal. If an overcurrent is detected, quickly turn off the power electronic switch. Step 3.1.4: The low-voltage output terminal continues to run for the set time, then automatically cuts off the power; Step 3.1.5: The information recording system records the results of the operation and monitoring signals; Step 3.2: The three-phase safety power supply enters the monitoring mode of external inspection status; Step 3.2.1: The three-phase safety power supply verifies the guardian's information, tests the circuit operation, and continuously monitors whether the guardian is in the monitoring position; Step 3.2.2: Manually turn on the high-voltage, high-current circuit; Step 3.2.3: The high-voltage, high-current circuit enters the working state and the first fast switch is turned on. If a phase loss is detected, an alarm will be triggered. Step 3.2.4: Detect the output current at the high voltage output terminal. If overcurrent is detected, turn off the first fast switch and trigger an alarm; or do not turn off the fast switch and enter a constant current state and trigger an alarm. Step 3.2.5: The information recording system records the results of the operation and the monitoring signals.

[0031] In step 2 above, the self-test system is equipped with a self-test circuit that is synchronized with the control circuit. The self-test circuit is equipped with a three-phase full-bridge rectifier circuit. The three-phase full-bridge rectifier circuit has three bridge arms. Each phase output terminal of the three-phase safety power supply is connected to one bridge arm of the three-phase full-bridge rectifier circuit.

[0032] The DC output terminals of the three-phase full-bridge rectifier circuit are connected to the first detection branch, the second detection branch, and the third detection branch, respectively. The first detection branch is equipped with a first load and a first detection switch, the second detection branch is equipped with a second load and a second detection switch, and the third detection branch is equipped with a third load and a third detection switch.

[0033] In step 2.1 above, the first detection switch is turned on to detect both ends of the first detection branch and obtain the range of high voltage and low current; in step 2.2 above, the second detection switch is turned on to detect both ends of the second detection branch and obtain the waveform of low voltage and high current; in step 2.3 above, the third detection switch is turned on to detect both ends of the third detection branch and obtain the waveform of high voltage and high current.

[0034] In step 2.2 above, the overcurrent protection value for low-voltage high-current is adjusted and set to the first set value. In step 2.3 above, the overcurrent protection value for high-voltage high-current is adjusted and set to the second set value. The first set value is greater than the second set value. In step 3.2.5 above, if an overcurrent exceeding the first set value is detected, the first fast switch is turned off and an alarm is triggered. If an overcurrent exceeding the second set value is detected in step 3.2.5 above, the first fast switch is not turned off, and the system enters a constant current state, and an alarm is triggered.

[0035] In step 2.1 above, the combined resistor is composed of the components of the parallel resistor switch, the resistor and the high voltage and low current detection circuit connected in series. The resistors are connected in parallel, and the switch components and resistors are provided in several quantities. In step 2.2 above, each phase power electronic switch is connected in series with the second switch. In step 2.3 above, each phase first fast switch is connected in series with the first switch to form a branch, and each phase branch is connected in parallel with the combined resistor.

[0036] The power electronic switch includes any of the following: a power electronic switch composed of an insulated gate transistor and a diode, a power electronic switch composed of two thyristors connected in antiparallel, a power electronic switch composed of an insulated gate transistor and a diode, a power electronic switch composed of two thyristors connected in antiparallel, or any power electronic switch known to those skilled in the art.

[0037] If any step in steps 2 to 3.2.4 above fails to operate normally, the three-phase safety power supply will display the fault point.

[0038] The detection circuit in steps 3.2.1 to 3.2.5 above controls whether the three-phase safety power supply is turned off by detecting whether the guardian is in the monitoring position.

[0039] The external inspection system has a safety mode and a monitoring mode. Before operation, the monitoring mode requires the identification of the monitor. At the same time, the detection circuit detects whether the person is in a monitoring position throughout the process, and then controls whether the three-phase power supply is turned off. This frees teachers from the role of safety assurance and improves the quality and efficiency of teaching to a new level.

[0040] The output of the three-phase safety power supply is connected to the motor set. The motor set includes a test motor, a normal motor, and a motor set detection circuit system connected in parallel. It also has a motor set detection mode. The motor set is connected to the external detection system of the three-phase safety power supply through the motor set detection circuit system. A switch is provided between the output of the three-phase safety power supply and the motor set. The detection safety mode of the external detection circuit system of the motor unit is synchronized with the safety mode of the three-phase safe power supply, and the detection monitoring mode of the external detection circuit system of the motor unit is synchronized with the monitoring mode of the three-phase safe power supply. The operation process of the generator set is as follows: Step 1: The motor set is connected to the output terminal of the three-phase safety power supply, or multiple output ports are added to the output terminal of the three-phase safety power supply. One of the two is connected to the external testing system at the same time. The motor set testing circuit system can automatically identify the connection status of the test motor and the normal motor. Step 2: After the user confirms safety, the motor set detection circuit system enters the working state, the three-phase safety power supply enters the motor set detection mode, starts the motor set connected to the external detection system, and starts running; Step 3: The three-phase safety power supply operates in the motor set detection safety mode; Step 3.1: After receiving the start command, the external test circuit system of the motor set turns on the switch to test the motor start. The three-phase safety power supply external inspection system monitors relevant data. If faults such as overcurrent or phase loss occur, the three-phase safety power supply will shut down the output, record the data, and sound an alarm. Step 3.2: The external circuit system of the motor set also records relevant data and displays the fault point; Step 4: The three-phase safety power supply operates in the motor set detection and monitoring mode; Step 4.1: When the three-phase safety power supply is in motor detection and monitoring mode, turn on the switch. The motor will start with reduced voltage and current limiting until full voltage output. If a phase loss, overcurrent during full voltage output, or failure to output full voltage after reaching the set start time occurs, the three-phase safety power supply will shut off the output, record the data, and sound an alarm. Step 4.2: Simultaneously, the external inspection circuit system of the motor set also records relevant data and displays the fault point; Step 5: Exit the detection mode for the motor unit.

[0041] Example 1:

[0042] like Figure 2 As shown, Figure 2 This is an embodiment of a three-phase safe power supply according to the present invention.

[0043] The three-phase safety power supply includes a three-phase voltage regulator and a transformer T. The three-phase output terminals of the three-phase voltage regulator are electrically connected to the input terminals of the transformer. The transformer has three-phase high-voltage output terminals and low-voltage output terminals, and the transformer has a 36V power output terminal.

[0044] The three-phase voltage of 220V is input through a three-phase voltage regulator. The transformer maintains the output voltage at the stable normal voltage of 220V provided by the high-voltage output terminal, and transforms it into a stable three-phase voltage of 20.5V±1% U20 provided by the low-voltage output terminal and a stable voltage of 35.6V±1% U36 provided by the 36V power supply output terminal.

[0045] In this embodiment, the power electronic switch is composed of two thyristors connected in antiparallel.

[0046] The first fast switch at the high-voltage output terminal of each phase is connected in series with the first switch to form a branch, and the branch is connected in series with the combination switch, such as... Figure 2 As shown, at the high voltage output terminal A, the first fast switch KK1 and the first switch KM1 are connected in series to form a branch and are connected in parallel with the combined resistor RA; at the high voltage output terminal B, the first fast switch KK3 and the first switch KM3 are connected in series to form a branch and are connected in parallel with the combined resistor RB; at the high voltage output terminal C, the first fast switch KK5 and the first switch KM5 are connected in series to form a branch and are connected in parallel with the combined resistor RC.

[0047] Each phase power electronic switch is connected in series with the second switch, such as Figure 2 As shown, the low-voltage output terminal a consists of a power electronic switch composed of KT1 and KT4 connected in series with the second switch KM4; the low-voltage output terminal b consists of a power electronic switch composed of KT3 and KT6 connected in series with the second switch KM6; and the low-voltage output terminal c consists of a power electronic switch composed of KT5 and KT2 connected in series with the second switch KM2.

[0048] Then, the high-voltage output terminal A and the low-voltage output terminal a are connected in parallel in phase and then connected in series with the current transformer CT A to output terminal R; the high-voltage output terminal B and the low-voltage output terminal b are connected in parallel in phase and then connected in series with the current transformer CT B to output terminal S; the high-voltage output terminal C and the low-voltage output terminal c are connected in parallel in phase and then connected in series with the current transformer CT C to output terminal T.

[0049] When KM1, KM3, and KM5 are disconnected and KM2, KM4, and KM6 are connected, the safety power supply operates in low-voltage mode, and students do not need to be supervised during operation. When KM1, KM3, and KM5 are connected and KM2, KM4, and KM6 are disconnected, the safety power supply operates in high-voltage mode, and students need to be supervised during operation.

[0050] Meanwhile, in this embodiment, the 36V power output terminal is equipped with a second fast switch KK36 connected in series with the current detection module IC 36.

[0051] Example 2:

[0052] like Figure 4 As shown, Figure 4 This is an embodiment of a self-testing system of the present invention, which will be explained in conjunction with the technical solution of Embodiment 1.

[0053] Figure 4 It consists of a three-phase full-bridge rectifier circuit, which has three bridge arms. Each phase output terminal is connected to one bridge arm of the three-phase full-bridge rectifier circuit. The three-phase full-bridge rectifier circuit has output terminals M and N.

[0054] The output terminals M and N are connected to the first detection branch, which consists of the first load RS1 and the first detection switch QC1; they are also connected to the second detection branch, which consists of the second load RS2 and the second detection switch QC2; and the third detection branch, which consists of the third load RS3 and the third detection switch QC3. The three-phase full-bridge rectifier circuit is equipped with a current detection module IC Q for detecting overcurrent conditions.

[0055] In this embodiment, the first load RS1 is a light load and is set to 500Ω, the second load RS2 is a low-voltage rated load and is set to 5Ω, and the third load RS3 is a high-voltage rated load and is set to 50Ω.

[0056] When the current at terminals M and N is detected, the control circuit synchronizes the three-phase safety power supply. The power input is a sine wave, and QC1, QC2, and QC3 are turned on sequentially at the set phase angle.

[0057] Activate QC1 to check the status of RA, RB, RC and whether the three-phase high voltage output terminal is normal. For example, determine whether there is a phase loss, whether the output small current is within the allowable setting range (6-10mA), and collect the high voltage small current output waveform for analysis. Turn on QC2 to check the status of thyristors KT1-KT6 and whether the three-phase low-voltage output terminals are normal. Then turn on QC3 to check whether thyristors KT1-KT6 can be quickly turned off when overcurrent occurs in low-voltage operation. Collect the low-voltage high-current output waveform for analysis. Turn on QC3 to check the status of KK1, KK3, and KK5 and whether the three-phase high-voltage output is normal. Then turn on QC2 to check whether KK1, KK3, and KK5 can quickly shut off when overcurrent occurs during high-voltage operation. Then turn on QC1 and turn off QC2 to determine whether the current automatically enters a constant current state. At the same time, collect the high-voltage high-current output waveform for analysis.

[0058] Example 3:

[0059] like Figure 4 As shown, Figure 4 This is an embodiment of the combined resistor of the present invention.

[0060] Figure 4 The RA is the same as that in Example 1, where the RB and RC in Example 1 are the same as those in this example. The components of resistor RA1 and switch KA1 in parallel, resistor RA2 and switch KA2 in parallel, resistor RA3 and switch KA3 in parallel, and resistor RA4 and switch KA4 in parallel are connected in series and connected in series with RA5, RA6, and high voltage low current detection circuit IC 1A to form RA.

[0061] In this embodiment, RA1 is set to 1KΩ, RA2 to 2.2KΩ, RA3 to 4.7KΩ, RA4 to 10KΩ, RA5 to 10KΩ, and RA6 to 10KΩ.

[0062] Similarly, the composition of the combined resistors RB and RC is the same as that of RA, but it is not shown in this invention.

[0063] The resistance value of RA is controlled between 22K and 36.67K, and the maximum operating current is limited to 6-10mA, enabling the three-phase safety power supply to provide an adjustable high-voltage operating current, improving circuit reliability and safety. It is also equipped with a high-voltage low-current detection circuit to automatically adjust the high-voltage operating current according to the settings.

[0064] Based on the load status detected by the high-voltage, low-current detection circuits IC 1A, IC 2A, and IC 3A, the control system provides trigger signals to the thyristors KT1-KT6 to reduce the impact of leakage current on the output voltage.

[0065] Example 4:

[0066] Combining the technical solutions of Embodiments 1, 2, and 3, Embodiment 4 of the control method of the present invention is as follows: Step 1: Start the three-phase safety power supply; Step 2: Run the self-test system and enter self-test mode; Step 2.1: Disconnect KA1, KA2 and KA3 of the combined resistor RA, close KA4, and adjust the current to around 8mA. Adjust the current of the combined resistors RB and RC to around 8mA in the same way. Check whether the high voltage output terminal and the combined resistors RA, RB and RC are operating normally, and check the range of high voltage and low current output. If the three-phase safety power supply is not normal, the fault point will be displayed. Step 2.2: Adjust the first current setting value, check whether the thyristors KT1-KT6 of the power electronic switch at the low voltage output terminal are operating normally, and check whether the thyristors KT1-KT6 of the power electronic switch can quickly turn off when an overcurrent condition occurs during the low voltage output state. If the three-phase safety power supply is abnormal, the fault point will be displayed. Step 2.3: Intelligently adjust the second set value of the current, detect whether the high voltage output terminal and the first fast switch KK1, KK3, KK5 are operating normally, and detect the overcurrent situation when the high voltage output status occurs. Check whether the first fast switch KK1, KK3, KK5 is quickly turned off or the current enters a constant current state. If the three-phase safety power supply is abnormal, the fault point will be displayed. Step 2.4: If everything is displayed normally, the information recording system records the detection time and detection data.

[0067] Step 3: The three-phase safety power supply enters the external inspection state; Step 3.1: The three-phase safety power supply enters the safety mode of external inspection. Step 3.1.1: It is detected that the continuous output current of the 36V power supply exceeds the third set value and the three-phase safety power supply outputs high voltage and low current; Step 3.1.2: The low-voltage high-current circuit enters the working state, and at the same time, the thyristors KT1-KT6 of the power electronic switch are turned on; Step 3.1.3: Detect the output current at the low-voltage output terminal. If an overcurrent is detected, quickly turn off the thyristors KT1-KT6 of the power electronic switch. Step 3.1.4: Normal operation, the low-voltage output terminal continues to run for the set time, and then automatically cuts off the power; Step 3.1.5: The information recording system records the results of the operation and monitoring signals; Step 3.2: The three-phase safety power supply enters the monitoring mode of external inspection status; Step 3.2.1: The three-phase safety power supply verifies the guardian's information, tests the circuit operation, and continuously monitors whether the guardian is in the monitoring position; Step 3.2.2: Manually turn on the high-voltage, high-current circuit; Step 3.2.3: The high-voltage, high-current circuit enters the working state, and the first fast switches KK1, KK3, and KK5 are turned on at the same time. If a phase loss is detected, an alarm will be triggered. Step 3.2.4: Detect the output current at the high voltage output terminal. If an overcurrent exceeding the first set value is detected, turn off the first fast switches KK1, KK3, and KK5 and trigger an alarm. If an overcurrent exceeding the second set value is detected, do not turn off the first fast switches KK1, KK3, and KK5 to enter constant current state, but trigger an alarm. Step 3.2.5: The information recording system records the results of the operation and the monitoring signals.

[0068] Example 5:

[0069] The main output circuit has several output ports, each of which is connected to a motor unit.

[0070] This invention can add multiple output ports and matching motor sets at the output end, and equip them with an output controller, enabling one three-phase safety power supply to control multiple motor sets. At the same time, it can make appointments for output, allowing students to make appointments in advance and make preparations. The equipment can be disconnected at regular intervals to regulate the students' experimental time, thereby improving the efficiency of the safety power supply and reducing the purchase cost.

[0071] like Figure 5As shown, in this embodiment, the output terminal of the three-phase safety power supply is connected to the motor set (with a matching safety guard). The motor set includes a test motor M1, a normal motor M2, and a motor set detection circuit system connected in parallel, and is equipped with a motor set detection mode. The test motor M1 is connected in series with switch KM7, the normal motor M2 is connected in series with switch KM8, and switch KM is provided between the output terminal of the three-phase safety power supply and the motor set.

[0072] The motor set is connected to the external inspection system of the three-phase safety power supply through the matching motor set detection circuit system via wired or wireless connection. The motor set detection circuit system can automatically identify the connection status of the test motor M1 and the normal motor M2. In this embodiment, the external inspection system activates the test motor M1 in safety mode and the normal motor M2 in monitoring mode.

[0073] The detection safety mode of the external detection circuit system of the motor unit is synchronized with the safety mode of the three-phase safe power supply, and the detection monitoring mode of the external detection circuit system of the motor unit is synchronized with the monitoring mode of the three-phase safe power supply.

[0074] The following is a detailed operation process for this embodiment: Step 1: The motor set is connected to the output terminal of the three-phase safety power supply, or multiple output ports are added to the output terminal of the three-phase safety power supply. One of the two is connected to the external testing system at the same time. This connection method can be wired or wireless. The motor set detection circuit system can automatically identify the connection status of the test motor M1 and the normal motor M2. Step 2: After the user confirms safety, the motor set detection circuit system enters the working state, the three-phase safety power supply enters the motor set detection mode, starts the motor set, connects to the external detection system, and starts running; Step 3: The three-phase safety power supply operates in the motor set detection safety mode; Step 3.1: After receiving the start command, the external test circuit system of the motor set connects KM and KM7, and the test motor M1 starts. The safety power external detection system monitors relevant data. If faults such as overcurrent or phase loss occur, it will shut down the output, record data, and issue an alarm. Step 3.2: The external circuit system of the motor set also records relevant data and displays the fault point, which makes it convenient for maintenance personnel to compare the two sets of data to identify the fault and carry out maintenance. If the data is normal, it is recorded as historical data and kept for comparison with the students' practical operation data. Step 4: The three-phase safety power supply operates in the motor set detection and monitoring mode; Step 4.1: The three-phase safety power supply operates in the motor set detection and monitoring mode. Because there are protection measures, the operator's identity does not need to be identified at this time, but someone must be on site. Connect KM and KM8. Normally, the motor M2 will start with reduced voltage and current limiting until full voltage output. If a phase loss, overcurrent during full voltage output, or failure to output full voltage after reaching the set start time occurs, the output will be shut off, data will be recorded, and an alarm will be triggered. Step 4.2: At the same time, the external circuit system of the motor set also records relevant data and displays the fault point, which makes it convenient for maintenance personnel to compare the two sets of data to identify the fault and carry out maintenance; if the data is normal, it is recorded as historical data and kept for comparison with the students' practical operation data; Step 5: Exit the detection mode for the motor unit.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A safety power supply control method based on electric drive course training, comprising a three-phase safety power supply, a self-testing system, an external testing system, and a control circuit, characterized in that, The self-test system and the external test system are electrically connected to the output terminals of the three-phase safety power supply. The control circuit is electrically connected to the three-phase safety power supply, the self-test system, and the external test system. The three-phase safety power supply has a main output circuit and a 36V power output terminal. The main output circuit has a three-phase high-voltage output terminal and a three-phase low-voltage output terminal. The high-voltage output terminal is connected to a high-voltage high-current circuit and a high-voltage low-current circuit. The low-voltage output terminal is connected to a low-voltage high-current circuit. Each phase of the high-voltage output terminal has a high-voltage low-current detection circuit, a combined resistor, a first fast switch, and a first switch. Each phase of the low-voltage output terminal has a power electronic switch and a second switch. The output current of the main output circuit has a first set value and a second set value. The 36V power output terminal has a second fast switch and a current detection module. The output current of the 36V power output terminal has a third set value. The external inspection system has a safety mode and a monitoring mode. The safety mode is in a high voltage and low current output state and a low voltage and high current output state. The monitoring mode is in a high voltage and high current output state. The monitoring mode is equipped with a detection circuit. The three-phase safety power supply is equipped with an information recording system. The control method comprises the following steps: Step 1: Start the three-phase safety power supply; Step 2: Run the self-test system and enter self-test mode; Step 2.1: Check whether the high voltage output terminal and the combined resistor are operating normally, and the range of high voltage and low current output; Step 2.2: Check whether the low-voltage output terminal and the power electronic switch are operating normally, and check whether the power electronic switch can quickly turn off when an overcurrent condition occurs during the low-voltage output state; Step 2.3: Check whether the high voltage output terminal and the first fast switch are operating normally, and check whether the first fast switch can quickly turn off or whether the current enters a constant current state when the high voltage output state is detected to be in an overcurrent state. Step 2.4: The information recording system records the detection time and detection data; Step 3: The three-phase safety power supply enters the external inspection state; Step 3.1: The three-phase safety power supply enters the safety mode of external inspection. Step 3.1.1: It is detected that the continuous output current of the 36V power supply exceeds the third set value and the three-phase safety power supply outputs high voltage and low current; Step 3.1.2: The low-voltage high-current circuit enters the working state and turns on the power electronic switch; Step 3.1.3: Detect the output current at the low-voltage output terminal. If an overcurrent is detected, quickly turn off the power electronic switch. Step 3.1.4: After the low-voltage output terminal has been running for a set time, the three-phase safety power supply will automatically disconnect. Step 3.1.5: The information recording system records the operation results and monitoring signals; Step 3.2: The three-phase safety power supply enters the monitoring mode of external inspection status; Step 3.2.1: The three-phase safety power supply verifies the guardian's information, and the detection circuit operates and continuously detects whether the guardian is in the monitoring position; Step 3.2.2: Manually turn on the high-voltage, high-current circuit; Step 3.2.3: The high-voltage, high-current circuit enters the working state and simultaneously turns on the first fast switch. If a phase loss is detected, an alarm is triggered. Step 3.2.4: Detect the output current of the high-voltage output terminal. If an overcurrent is detected, turn off the first fast switch and trigger an alarm; or do not turn off the fast switch and enter a constant current state and trigger an alarm. Step 3.2.5: The information recording system records the results of the operation and the monitoring signals.

2. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, The self-test system described in step 2 above is equipped with a self-test circuit synchronized with the control circuit. The self-test circuit is equipped with a three-phase full-bridge rectifier circuit with three bridge arms. Each phase output terminal of the three-phase safety power supply is connected to one bridge arm of the three-phase full-bridge rectifier circuit. The DC output terminals of the three-phase full-bridge rectifier circuit are respectively connected to the first detection branch, the second detection branch, and the third detection branch. The first detection branch is equipped with a first load and a first detection switch, the second detection branch is equipped with a second load and a second detection switch, and the third detection branch is equipped with a third load and a third detection switch.

3. The safe power supply control method based on electric drive course training according to claim 2, characterized in that, Step 2.1 above: turn on the first detection switch to detect both ends of the first detection branch and obtain the range of high voltage and low current; Step 2.2 above: turn on the second detection switch to detect both ends of the second detection branch and obtain the waveform of low voltage and high current; Step 2.3 above: turn on the third detection switch to detect both ends of the third detection branch and obtain the waveform of high voltage and high current.

4. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, In step 2.2 above, the overcurrent protection value for low voltage and high current is adjusted and set to the first set value. In step 2.3 above, the overcurrent protection value for high voltage and high current is adjusted and set to the second set value. The first set value is greater than the second set value. In step 3.2.5 above, if an overcurrent exceeding the first set value is detected, the first fast switch is turned off and an alarm is triggered. In step 3.2.5 above, if an overcurrent exceeding the second set value is detected, the first fast switch is not turned off and the system enters a constant current state, and an alarm is triggered.

5. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, In step 2.1 above, the combined resistor is composed of a resistor parallel switch assembly, a resistor and a high-voltage low-current detection circuit connected in series, and the resistor parallel switch assembly and the resistor are provided in several units.

6. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, In step 2.3 above, the first fast switch and the first switch of each phase are connected in series to form a branch, and the branch of each phase is connected in parallel with the combined resistor.

7. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, If any of the steps 2 to 3.2.4 above fails to operate normally, the three-phase safety power supply will display a fault point.

8. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, The detection circuit in steps 3.2.1 to 3.2.5 above controls whether the three-phase safety power supply is turned off by detecting whether the person is in a monitoring position.

9. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, The main output circuit has several output ports, and each output port is connected to a motor unit.

10. The safe power supply control method based on electric drive course training according to claim 1, characterized in that, The output terminal of the three-phase safety power supply is connected to the motor set. The motor set includes a test motor, a normal motor, and a motor set detection circuit system connected in parallel, and is equipped with a motor set detection mode. The motor set is connected to the external detection system of the three-phase safety power supply through the motor set detection circuit system. A switch is provided between the output terminal of the three-phase safety power supply and the motor set. The detection safety mode of the external detection circuit system of the motor set is synchronized with the safety mode of the three-phase safety power supply, and the detection monitoring mode of the external detection circuit system of the motor set is synchronized with the monitoring mode of the three-phase safety power supply. The operation process of the motor set is as follows: Step 1: The motor set is connected to the external testing system through the output terminal of the three-phase safety power supply, or by adding multiple output ports to the output terminal of the three-phase safety power supply. The motor set detection circuit system can automatically identify the connection status of the test motor and the normal motor. Step 2: After the user confirms safety, the motor set detection circuit system enters the working state, the three-phase safety power supply enters the motor set detection mode, starts the motor set connected to the external detection system, and starts running; Step 3: The three-phase safety power supply operates in the motor set detection safety mode; Step 3.1: After receiving the start command, the external test circuit system of the motor set turns on the switch, and the test motor starts. The three-phase safety power supply external detection system monitors relevant data. If a fault such as overcurrent or phase loss occurs, the three-phase safety power supply will shut down the output, record the data, and sound an alarm. Step 3.2: The external inspection circuit system of the motor set also records relevant data and displays the fault point; Step 4: The three-phase safety power supply operates in the motor set detection and monitoring mode; Step 4.1: The three-phase safety power supply operates in the motor set detection and monitoring mode. When the switch is turned on, the motor will start with reduced voltage and current limiting until full voltage output. If a phase loss, overcurrent during full voltage output, or failure to output full voltage after reaching the set start time occurs, the three-phase safety power supply will shut off the output, record the data, and sound an alarm. Step 4.2: Simultaneously, the external detection circuit system of the motor set also records relevant data and displays the fault point; Step 5: The motor unit exits the detection mode.

Images