Dc-dc adaptive segmented voltage throw-in control method and system

Abstract

This invention provides a DC-DC adaptive segmented voltage switching control method and system, belonging to the field of test power supply. It detects the output voltage of the equipment; when the voltage is greater than a certain value, a switching action is initiated. If the current does not exceed the protection point, the process proceeds to S3; otherwise, it proceeds to S9. The process is as follows: S3: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S4. S4: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S5. S5: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S6. S6: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S7. S7: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S8. S8: Check if the condition is met; if yes, proceed to S9; otherwise, proceed to S9. This method offers high safety.

Description

Technical Field

[0001] This invention relates to the technical field of test power supply equipment and motor control equipment, and in particular to a DC-DC adaptive segmented voltage switching control method and system. Background Technology

[0002] In the field of motor testing systems, constant voltage source equipment is an indispensable piece of testing equipment. When testing motor electronic control, back electromotive force (EMF) is generated when the motor decelerates or stops. At this time, the power supply has already stopped or failed, and cannot absorb this energy. This energy will raise the voltage at the power supply port. Since the power devices (such as MOSFETs and IGBTs) and output capacitors inside the power supply have maximum withstand voltage values, the high amplitude back EMF will be superimposed on the power supply output voltage, which may momentarily exceed the rated voltage of these devices, causing the power devices to break down, the output capacitors to be damaged, and resulting in permanent power supply failure.

[0003] Furthermore, if the power supply suddenly loses power or behaves abnormally due to back electromotive force (EMF) damage, the controlled motor may be placed in an unexpected free-stop state. In certain precision testing scenarios, this could pose a risk to the mechanical load or the device under test itself, and may also damage other equipment connected to the same line. In addition, the instantaneous changes in back EMF (dV / dt or dI / dt) are large, generating strong high-frequency electromagnetic interference. This not only affects the stability of the power supply's own control circuit, but may also affect other sensitive instruments on the same test bench (such as sensors, data acquisition cards, controllers, etc.) through conduction or radiation, leading to inaccurate measurement data. Meanwhile, in motor and electronic control testing, the power supply, electronic control system, and load are all extremely expensive assets, requiring reliable switching techniques to protect these valuable assets and ensure the reliability of test data.

[0004] Many existing power supply devices choose to connect larger capacity capacitors in parallel at the output to suppress voltage rise. This method results in a large power cabinet, high cost, and can only buffer energy, not dissipate it, meaning the energy may still ultimately threaten the power supply. Another approach is to add an overvoltage protection clamping circuit to the power supply device. When the output voltage exceeds a set safety threshold, an internal clamping switch is immediately triggered, briefly short-circuiting the output to ground or a low voltage to forcibly absorb energy. This method has a complex circuit and is essentially sacrificial protection; frequent triggering can stress the components.

[0005] In the prior art, Chinese invention patent application CN115001294A, entitled "A Cyclic Pulse High-Power Demagnetizing Main Power Supply System," includes an energy dissipation device between the DC / DC step-up / step-down converter and the chopper commutation unit. This device is used to rapidly absorb energy from the large inductive load during the pulse current decrease phase by employing a segmented resistor switching method. However, it fails to consider the possibility of resistor heating due to high voltage and high power, which could lead to safety issues. Summary of the Invention

[0006] The technical problem to be solved by this invention is: how to solve the problem of low safety caused by high voltage causing resistor heating in the prior art using resistor switching voltage reduction method.

[0007] This invention solves the above-mentioned technical problems through the following technical solution: a DC-DC adaptive segmented voltage switching control method, comprising:

[0008] S1, Set the voltage command value for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; S2, when the output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then proceed to step S3; otherwise proceed to step S9. S3, Sampling Output Voltage ,judge Whether it is valid, To set a threshold, if the condition is met, proceed to step S9; otherwise, proceed to step S4. S4, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S5. S5, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S6. S6, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S7. S7, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S8. S8, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, continue until the condition is met. Then proceed to step S9; S9, Disconnect the switch.

[0009] This invention addresses the issue of resistor heating caused by high voltage and high power, and provides an adaptive segmented voltage switching control method for DC-DC converters. By setting different voltage commands, the constant voltage power supply device samples the output voltage of the device under test in real time, automatically compares it with the set segmented voltages, times the switching time of each voltage segment, and simultaneously detects the current during the switching process. This ensures that the switching circuit can be disconnected in time under abnormally high voltage conditions, automatically switching to reduce the voltage and protecting both the source device and the device under test, thus ensuring high safety.

[0010] Preferred time , , , , , The conditions that must be met are: .

[0011] Preferably, the switching current in step S2 refers to the current flowing through the switching circuit.

[0012] Preferably, the output terminal of the source device is connected to the input terminal of the DC / DC converter, the first output terminal of the DC / DC converter is connected to the switching circuit and one end of the device under test, and the second output terminal of the DC / DC converter is connected to the switching circuit and the other end of the device under test.

[0013] Preferably, the switching circuit includes a switching resistor and a switching IGBT connected in series. One end of the switching resistor serves as the first terminal of the switching circuit, and the other end of the switching resistor is connected to the collector of the switching IGBT. The emitter of the switching IGBT serves as the second terminal of the switching circuit. This invention uses a simple, fully controllable device, the IGBT, and a resistor to implement the switching voltage reduction process. When a risk of energy backflow is detected, the standard test power supply is quickly physically disconnected from the circuit and switched to a device that can absorb energy, thereby protecting the power supply. The switching circuit is simple and low in cost.

[0014] Preferably, one end of the switching resistor is connected to the first output terminal of the DC / DC converter and connected to one end of the device under test through a main switch, and the emitter of the switching IGBT is connected to the second output terminal of the DC / DC converter and the other end of the device under test, respectively.

[0015] This invention also provides a DC-DC adaptive segmented voltage switching control system, comprising: The initialization module is used to set the voltage command values ​​for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; Switching execution module, used when output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then proceed to the first judgment module; otherwise, proceed to the exit module. The first judgment module is used to sample the output voltage. ,judge Whether it is valid, If a threshold is set and the condition is met, proceed to the exit module; otherwise, proceed to the second judgment module. The second judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the third judgment module. The third judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. If the condition is met, proceed to the exit module; otherwise, proceed to the fourth judgment module. The fourth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the fifth judgment module. The fifth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the sixth judgment module. The sixth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, continue until the condition is met. Then enter the exit module; The exit module is used to disconnect the switching process.

[0016] Preferred time , , , , , The conditions that must be met are: .

[0017] Preferably, the switching current in the switching execution module refers to the current flowing through the switching circuit.

[0018] Preferably, the output terminal of the source device is connected to the input terminal of the DC / DC converter, the first output terminal of the DC / DC converter is connected to the switching circuit and one end of the device under test, and the second output terminal of the DC / DC converter is connected to the switching circuit and the other end of the device under test. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 This is a schematic diagram of the switching circuit in the DC-DC adaptive segmented voltage switching control method provided in Embodiment 1 of the present invention; Figure 2 This is a flowchart of the DC-DC adaptive segmented voltage switching control method provided in Embodiment 1 of the present invention.

[0021] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] Example 1 like Figure 1As shown, the output terminal of the source device's DC is connected to the input terminal of the DC / DC converter 10. The first output terminal of the DC / DC converter 10 is connected to the switching circuit and one end of the device under test 20, respectively. The second output terminal of the DC / DC converter 10 is connected to the switching circuit and the other end of the device under test 20, respectively. The switching circuit includes a switching resistor R connected in series and a switching IGBT. One end of the switching resistor serves as the first terminal of the switching circuit, the other end of the switching resistor R is connected to the collector of the switching IGBT, and the emitter of the switching IGBT serves as the second terminal of the switching circuit.

[0024] exist Figure 1 In the circuit shown, one end of the switching resistor R is connected to the first output terminal of the DC / DC converter 10 and is connected to one end of the device under test 20 through the main switch S. The emitter of the switching IGBT is connected to the second output terminal of the DC / DC converter 10 and the other end of the device under test 20, respectively.

[0025] This invention uses simple, fully controllable IGBTs and resistors to implement the switching and voltage reduction process. When a risk of backflow is detected, the standard test power supply is quickly and physically disconnected from the circuit, switching to an energy-absorbing device to protect the power supply. The switching circuit is simple and low-cost.

[0026] See Figure 2 This embodiment provides a DC-DC adaptive segmented voltage switching control method, including the following steps: Step S1: Set the voltage command value for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; Step S2, when the output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then proceed to step S3; otherwise proceed to step S9. Here, the switching current refers to the current flowing through the switching circuit.

[0027] Step S3: Sample the output voltage ,judge Whether it is valid, To set a threshold, if the condition is met, proceed to step S9; otherwise, proceed to step S4. Step S4: Sample the output voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S5. Step S5: Sample the output voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S6. Step S6: Sample the output voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S7. Step S7: Sample the output voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S8. Step S8: Sample the output voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, continue until the condition is met. Then proceed to step S9; Step S9: Disconnect the switch.

[0028] Depend on Figure 2 As can be seen, when the source device detects a rise in the output voltage of the device under test (DUT) or a malfunction and shutdown of the source device, it immediately performs a switching action and monitors the switching current in real time to prevent damage to the switching equipment. During the switching process, the output voltage is monitored in real time and compared with the segmented voltage protection point to prevent overheating of the switching resistor due to excessive voltage. Different time intervals are recorded, and the switching is promptly disconnected, automatically switching back to reduce voltage, protecting both the source device and the DUT, ensuring high safety. The product has good performance and high reliability.

[0029] time , , , , , The conditions that must be met are: .

[0030] This invention addresses the issue of resistor heating caused by high voltage and high power, and provides an adaptive segmented voltage switching control method for DC-DC converters. By setting different voltage commands, the constant voltage power supply device samples the output voltage of the device under test in real time, automatically compares it with the set segmented voltages, times the switching time of each voltage segment, and simultaneously detects the current during the switching process. This ensures that the switching circuit can be disconnected in time under abnormally high voltage conditions. The method has clear logic, simple program and algorithm, and can ensure safety, reduce output voltage, and has very high timeliness.

[0031] Example 2 This embodiment provides a DC-DC adaptive segmented voltage switching control system, including: The initialization module is used to set the voltage command values ​​for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; Switching execution module, used when output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then it enters the first judgment module; otherwise, it enters the exit module. In the switching execution module, the switching current refers to the current flowing through the switching circuit.

[0032] The first judgment module is used to sample the output voltage. ,judge Whether it is valid, If a threshold is set and the condition is met, proceed to the exit module; otherwise, proceed to the second judgment module. The second judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the third judgment module. The third judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. If the condition is met, proceed to the exit module; otherwise, proceed to the fourth judgment module. The fourth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the fifth judgment module. The fifth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the sixth judgment module. The sixth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, continue until the condition is met. Then enter the exit module; The exit module is used to disconnect the switching process.

[0033] time , , , , , The conditions that must be met are: .

[0034] The output terminal of the source device is connected to the input terminal of the DC / DC converter. The first output terminal of the DC / DC converter is connected to the switching circuit and one end of the device under test (DUT). The second output terminal of the DC / DC converter is connected to the switching circuit and the other end of the DUT. In this embodiment, the switching circuit includes a switching resistor and a switching IGBT connected in series. One end of the switching resistor serves as the first terminal of the switching circuit, and is connected to the first output terminal of the DC / DC converter and, through a main switch, to one end of the DUT. The other end of the switching resistor is connected to the collector of the switching IGBT. The emitter of the switching IGBT serves as the second terminal of the switching circuit, and the emitter of the switching IGBT is connected to the second output terminal of the DC / DC converter and the other end of the DUT.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A DC-DC adaptive segmented voltage switching control method, characterized in that: include: S1, Set the voltage command value for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; S2, when the output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then proceed to step S3; otherwise proceed to step S9. S3, Sampling Output Voltage ,judge Whether it is valid, To set a threshold, if the condition is met, proceed to step S9; otherwise, proceed to step S4. S4, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S5. S5, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S6. S6, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S7. S7, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, proceed to step S8. S8, Sampling Output Voltage ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to step S9; otherwise, continue until the condition is met. Then proceed to step S9; S9, Disconnect the switch.

2. The DC-DC adaptive segmented voltage switching control method according to claim 1, characterized in that: time , , , , , The conditions that must be met are: .

3. The DC-DC adaptive segmented voltage switching control method according to claim 1, characterized in that: In step S2, the switching current refers to the current flowing through the switching circuit.

4. The DC-DC adaptive segmented voltage switching control method according to claim 1, characterized in that: The output terminal of the source device is connected to the input terminal of the DC / DC converter. The first output terminal of the DC / DC converter is connected to the switching circuit and one end of the device under test, respectively. The second output terminal of the DC / DC converter is connected to the switching circuit and the other end of the device under test, respectively.

5. The DC-DC adaptive segmented voltage switching control method according to claim 4, characterized in that: The switching circuit includes a switching resistor and a switching IGBT connected in series. One end of the switching resistor serves as the first terminal of the switching circuit, and the other end of the switching resistor is connected to the collector of the switching IGBT. The emitter of the switching IGBT serves as the second terminal of the switching circuit.

6. The DC-DC adaptive segmented voltage switching control method according to claim 5, characterized in that: One end of the switching resistor is connected to the first output terminal of the DC / DC converter and to one end of the device under test through the main switch. The emitter of the switching IGBT is connected to the second output terminal of the DC / DC converter and the other end of the device under test, respectively.

7. A DC-DC adaptive segmented voltage switching control system, characterized in that: include: The initialization module is used to set the voltage command values ​​for each segment. , , , , And the corresponding time, Real-time detection of the output voltage across the device under test ; Switching execution module, used when output voltage Greater than the switching voltage If the source device malfunctions, the blocking device will perform a switching action and start timing, monitoring the switching current in real time. If the switching current does not exceed the circuit protection point, the blocking execution time will be up to the specified time. Then proceed to the first judgment module; otherwise, proceed to the exit module. The first judgment module is used to sample the output voltage. ,judge Whether it is valid, If a threshold is set and the condition is met, proceed to the exit module; otherwise, proceed to the second judgment module. The second judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the third judgment module. The third judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. If the condition is met, proceed to the exit module; otherwise, proceed to the fourth judgment module. The fourth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the fifth judgment module. The fifth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, proceed to the sixth judgment module. The sixth judgment module is used to sample the output voltage. ,judge If the condition is met, the wave blocking execution time has elapsed. Then proceed to the exit module; otherwise, continue until the condition is met. Then enter the exit module; The exit module is used to disconnect the switching process.

8. The DC-DC adaptive segmented voltage switching control system according to claim 7, characterized in that: time , , , , , The conditions that must be met are: .

9. The DC-DC adaptive segmented voltage switching control system according to claim 7, characterized in that: In the switching execution module, the switching current refers to the current flowing through the switching circuit.

10. The DC-DC adaptive segmented voltage switching control system according to claim 7, characterized in that: The output terminal of the source device is connected to the input terminal of the DC / DC converter. The first output terminal of the DC / DC converter is connected to the switching circuit and one end of the device under test, respectively. The second output terminal of the DC / DC converter is connected to the switching circuit and the other end of the device under test, respectively.

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