Switch control circuit
By integrating control modules, drive modules, transformer modules, and IGBT switching modules, the problems of high cost, large size, and poor reliability of vacuum high-voltage relays in high-voltage circuit control are solved, realizing a low-cost, small-size, and high-speed response switching control circuit design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN SEPPO BIOTECHNOLOGY CO LTD
- Filing Date
- 2025-12-12
- Publication Date
- 2026-05-05
AI Technical Summary
Existing vacuum high-voltage relays suffer from high cost, large size, poor reliability, and slow response speed in high-voltage circuit control, making it difficult to meet the requirements of lightweight, low cost, and high speed in electronic equipment.
By combining a control module, a drive module, a transformer module, a rectifier module, and an IGBT switching module, the switching on and off of the IGBT unit is controlled by coordinating signal outputs. Combined with the transformer module design using ferrite and copper foil coil windings, low cost, small size, and high reliability are achieved.
It achieves low-cost design and small-size integration, while possessing high reliability and high-speed response performance, improving the stability and reliability of circuit operation, and avoiding energy waste and equipment damage.
Smart Images
Figure CN121979015A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of high-voltage circuit control technology, and in particular to a switch control circuit. Background Technology
[0002] In the field of high-voltage circuit control, vacuum high-voltage relays are the core components for controlling circuit on / off states. Their working principle involves using an external circuit to control platinum contacts, welded with shape-memory metal and sealed within a vacuum ceramic or glass cavity, to achieve short-circuit or open-circuit operation, thus completing the switching function. However, existing vacuum high-voltage relays suffer from numerous technical defects, making it difficult to meet the current development demands for lightweight, low-cost, high-speed, and high-reliability electronic equipment.
[0003] In terms of cost, its overall design uses a large number of precious metals such as platinum contacts, rare earth magnets, brass wires, and shape memory conductive metals. Furthermore, the assembled components need to be fixed in a cavity of highly sealed insulating material and processed through complex processes such as vacuuming and sealing, resulting in high prices for single-contact relays and low production efficiency.
[0004] In terms of size, the vacuum high-voltage relay needs to be repackaged after the main body is manufactured. After packaging, the size increases further, which can cause layout difficulties in high-density circuit board design and also limits the aesthetic design of electronic products.
[0005] In terms of reliability and response speed, if the vacuum device is bumped and broken during transportation, the loss of vacuum will cause arcing at the platinum contacts, which will damage the component. In addition, the conduction time is affected by the delay characteristics of the wire-wound inductor, and a single turn-on and turn-off takes 10-20 milliseconds, which cannot meet the requirements of high-speed switch design.
[0006] In summary, existing high-voltage on / off control circuits using vacuum high-voltage relays have significant shortcomings in terms of cost control, size optimization, transportation reliability, and response speed. There is an urgent need to design a switching control circuit that combines low cost, small size, high reliability, and high-speed response to achieve on / off control of high-voltage circuits. Summary of the Invention
[0007] The main objective of this application is to provide a switching control circuit that can achieve low-cost design and small-size integration while also having high reliability and high-speed response performance.
[0008] This application provides a switch control circuit applied in a power supply system. The power supply system includes a high-voltage DC power supply and electrical equipment. The switch control circuit includes: a control module, a drive module, multiple transformer modules, multiple rectifier modules, and an IGBT switch module. The control module is used to output a first signal. The input terminal of the drive module is connected to the control module, and the drive module is used to perform level conversion on the first signal to form a second signal. The transformer modules are integrated on a circuit board and include: a ferrite core and a primary coil winding and a secondary coil winding wound around both ends of the ferrite core. The primary coil winding and the secondary coil winding are embedded in the circuit board. The circuit board includes a primary coil winding connected to the drive module, a transformer module for transforming the second signal to form a third signal, a rectifier module connected to the secondary coil winding for rectifying the third signal to form a fourth signal, an IGBT switching module whose input terminal is connected to the high-voltage DC power supply, and an IGBT switching module whose output terminal is connected to the electrical equipment. The IGBT switching module includes multiple IGBT units connected in series, each IGBT unit connected to the rectifier module, and each IGBT unit controls the switching of the high-voltage DC power supply to the electrical equipment according to the fourth signal.
[0009] According to an embodiment of this application, a switch control circuit is provided. First, compared to existing high-voltage on / off control circuits using vacuum high-voltage relays, this application achieves a stable fourth signal output through the coordinated action of a control module, a drive module, multiple transformer modules, and multiple rectifier modules. This fourth signal is then used to control the on / off state of the IGBT units, thereby controlling the supply of high-voltage DC power to the electrical equipment. This achieves low-cost design and small-size integration while also providing high-reliability operation and high-speed response performance. Second, by setting up a drive module, it is possible to ensure that the signal is transmitted synchronously to multiple transformer modules, thereby ensuring that multiple IGBT units connected in series can be turned on simultaneously. Simultaneous disconnection improves circuit stability. Furthermore, the transformer module includes ferrite and primary and secondary coil windings wound around both ends of the ferrite. These windings are embedded in the circuit board. Compared to existing transformers, this design not only has a lower profile, lighter weight, and higher integration, saving space, but also effectively reduces production costs. Moreover, if the control module outputs an abnormal DC signal, the transformer module can cut off the DC signal, preventing further transmission to the rectifier module and IGBT unit. This prevents the IGBT unit from being mistakenly turned on due to control module malfunction, improving the reliability of the switching control circuit and avoiding energy waste. Attached Figure Description
[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0011] Figure 1 A system architecture diagram of a switch control circuit provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a transformer module in a switch control circuit according to an embodiment of this application; Figure 3 This application provides a system architecture diagram showing the connection between a drive module and a control module and a transformer module in a switch control circuit according to an embodiment of the present application. Figure 4 A circuit schematic diagram of a switch control circuit provided in one embodiment of this application; Figure 5 This is a system architecture diagram of another switch control circuit provided in an embodiment of this application. Detailed Implementation
[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0013] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.
[0014] In the field of high-voltage circuit control, vacuum high-voltage relays are the core components for realizing circuit on / off control. Their working principle involves using an external circuit to control platinum contacts, which are sealed within a vacuum ceramic or glass cavity and welded with shape-memory metal, to achieve short circuits or open circuits, thereby completing the switching function. However, existing high-voltage on / off control circuits using vacuum high-voltage relays have significant shortcomings in terms of cost control, size optimization, transportation reliability, and response speed.
[0015] Based on this, the embodiments of this application provide a switch control circuit that can achieve low-cost design and small-size integration while also having high reliability and high-speed response performance.
[0016] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0017] Please refer to Figure 1 , Figure 2 as well as Figure 4 This application provides a switch control circuit applied to a power supply system. The power supply system includes a high-voltage DC power supply and electrical equipment. The switch control circuit includes: a control module 100, a drive module 200, multiple transformer modules 300, multiple rectifier modules 400, and an IGBT switch module 500. The control module 100 is used to output a first signal. The input terminal of the drive module 200 is connected to the control module 100, and the drive module 200 is used to perform level conversion on the first signal to form a second signal. The transformer modules 300 are integrated on the circuit board 1000 and include: a ferrite 310 and a primary coil winding and a secondary coil winding wound around the two ends of the ferrite 310. The primary coil winding is embedded in the circuit board 1000. The primary coil winding is connected to the drive module 200. The transformer module 300 is used to transform the second signal to form the third signal. The rectifier module 400 is connected to the secondary coil winding and is used to rectify the third signal to form the fourth signal. The input terminal IN of the IGBT switch module 500 is connected to the high-voltage DC power supply, and the output terminal OUT of the IGBT switch module 500 is connected to the electrical equipment. The IGBT switch module 500 includes multiple IGBT units 510 connected in series. The IGBT units 510 are connected to the rectifier module 400 and are used to control the switching of the high-voltage DC power supply to the electrical equipment according to the fourth signal.
[0018] It should be noted that the cost of the IGBT unit 510 is much lower than that of the vacuum high-voltage relay, and the switching speed of the IGBT unit 510 is in the microsecond range, which is more than an order of magnitude higher than that of the vacuum high-voltage relay. Furthermore, the IGBT unit 510 is not at risk of breaking during transportation vibration. In addition, the components in the switching control circuit can be integrated and mounted on the circuit board 1000, which occupies little space.
[0019] It should be noted that the first, second, and third signals are all AC pulse signals, while the fourth signal is a DC signal, and the amplitudes of the first, second, and third signals gradually increase.
[0020] Preferably, the amplitude of the first signal is ±3.3V, the amplitude of the second signal is ±5V, the amplitude of the third signal is ±15V, and the amplitude of the fourth signal is around 15V. In this application, the amplitudes of the second and third signals can be appropriately adjusted according to the conduction voltage of the IGBT unit 510.
[0021] It should be noted that by setting a drive module 200 to output a second signal, it is possible to ensure that the second signal is synchronously transmitted to multiple transformer modules 300. Secondly, multiple transformer modules 300 simultaneously output a third signal to the corresponding connected rectifier module 400. Furthermore, multiple rectifier modules 400 simultaneously output a fourth signal to the corresponding connected IGBT unit 510, thereby ensuring that multiple IGBT units 510 connected in series can be turned on and off simultaneously.
[0022] It should be noted that, referring to Figure 2 Both the primary and secondary coil windings are fabricated using copper foil inside the circuit board 1000. The transformer module 300, which is made by combining ferrite 310 with the primary and secondary coil windings fabricated using copper foil inside the circuit board 1000, can transform a second signal (i.e., a small pulse signal) into a third signal (i.e., a large pulse signal). Furthermore, since the primary and secondary coil windings are embedded in the circuit board 1000 and the ferrite 310 is relatively thin and light, the transformer module 300, compared to the existing transformer module solution that requires copper wire winding, not only has a lower profile, lighter weight, and higher integration, but also saves space and effectively reduces costs.
[0023] Furthermore, by setting a transformer module 300 in the switch control circuit, the reliability of the switch control circuit operation can be effectively improved. Specifically, if the control module 100 malfunctions and outputs a DC signal instead of an AC pulse signal, the DC signal passes through the drive module 200 and is transformed into a higher-level DC signal. Since the transformer module 300 only allows the AC change portion of the pulse signal to be effectively transmitted, the DC signal cannot be further transmitted to the rectifier module 400 and the IGBT unit 510. Therefore, the IGBT unit 510 will not be accidentally turned on due to the malfunction of the control module 100, which helps to improve the reliability of the switch control circuit operation, avoid energy waste, and prevent the electrical equipment from being damaged by high voltage for a long time, effectively improving the service life of the electrical equipment and the IGBT unit 510.
[0024] For example, the control module 100, drive module 200, multiple transformer modules 300, multiple rectifier modules 400 and GBT switch module in the switch control circuit can all be integrated on the same circuit board 1000, saving space and effectively reducing costs.
[0025] It should be noted that the number of transformer module 300, rectifier module 400 and IGBT unit 510 are all the same. The number of IGBT unit 510 can be appropriately adjusted according to the voltage value of the high voltage DC power supply. In this application, the number of transformer module 300, rectifier module 400 and IGBT unit 510 is not limited too much.
[0026] According to an embodiment of this application, a switch control circuit is provided. First, compared to existing high-voltage on / off control circuits using vacuum high-voltage relays, in this application, a stable fourth signal is output through the coordinated action of the control module 100, drive module 200, multiple transformer modules 300, and multiple rectifier modules 400. This fourth signal then controls the on / off state of the IGBT unit 510, thereby controlling the supply of high-voltage DC power to the electrical equipment. This achieves low-cost design and small-size integration while also possessing high reliability and high-speed response performance. Second, by setting up a drive module 200, it is possible to ensure synchronous signal transmission to multiple transformer modules 300, thereby ensuring that multiple IGBT units 510 connected in series can be turned on simultaneously and simultaneously... Disconnection improves the stability of circuit operation. In addition, the transformer module 300 includes a ferrite 310 and a primary coil winding and a secondary coil winding wound on both ends of the ferrite 310. The primary coil winding and the secondary coil winding are embedded in the circuit board 1000. Compared with existing transformers, it not only has a lower profile, lighter weight, and higher integration, saving space, but also further effectively reduces production costs. Furthermore, if the control module 100 outputs an abnormal DC signal, the transformer module 300 can cut off the DC signal. The DC signal cannot be further transmitted to the rectifier module 400 and the IGBT unit 510, so the IGBT unit 510 will not be accidentally turned on due to the abnormal operation of the control module 100. This helps to improve the reliability of the switching control circuit and avoid energy waste.
[0027] In some embodiments, refer to Figure 2The circuit board 1000 includes a first substrate, a second substrate, and a third substrate stacked sequentially. The secondary coil winding includes a first copper foil coil 331, a second copper foil coil 332, and a third copper foil coil 333. The first copper foil coil 331 is disposed on the first substrate, and a first via is provided in the first substrate. The starting end of the first copper foil wire is connected to the rectifier module 400, and the ending end of the first copper foil wire is connected to the first via. The second copper foil coil 332 is disposed on the second substrate, and the starting end of the second copper foil coil 332 is connected to the ending end of the first copper foil coil 331 through the first via. A second via is provided in the second substrate, and the ending end of the second copper foil coil 332 is connected to the second via. The third copper foil coil 333 is disposed on the third substrate, and the starting end of the third copper foil coil 333 is connected to the ending end of the second copper foil coil 332 through the second via. The ending end of the third copper foil coil 333 is connected to the rectifier module 400.
[0028] It should be noted that in the first substrate, the second substrate, and the third substrate, a continuous first copper foil coil 331, a second copper foil coil 332, and a third copper foil coil 333 are formed by etching, respectively. Furthermore, by opening a first via and a second via, the first copper foil coil 331, the second copper foil coil 332, and the third copper foil coil 333 can form a continuous secondary coil winding, and the induced current flows along the secondary coil winding.
[0029] It should be noted that both the first via and the second via are metal vias. The first via is used to realize the electrical connection between the first copper foil coil 331 and the second copper foil coil 332, and the second via is used to realize the electrical connection between the second copper foil coil 332 and the third copper foil coil 333.
[0030] It should be noted that, depending on the actual voltage boosting requirements of the circuit, the number of substrate layers in the circuit board 1000 can be appropriately increased to increase the number of turns in the secondary coil winding without increasing the area of a single substrate layer, thus saving space and effectively reducing costs.
[0031] In some embodiments, refer to Figure 2 The primary coil winding includes a fourth copper foil coil 321, which is disposed in any one of the first substrate, the second substrate, and the third substrate, and is connected to the drive module 200.
[0032] It is understandable that the fourth copper foil coil 321 can be disposed in any of the first substrate, the second substrate, and the third substrate without increasing the number of substrate layers in the circuit board 1000. It can be prepared in one of the substrates according to the complexity of the manufacturing process.
[0033] It should be noted that the ratio of the number of turns in the primary coil winding to the number of turns in the secondary coil winding can be adjusted appropriately according to the actual voltage boosting requirements of the circuit. In this application, no excessive restrictions are placed on the ratio of the number of turns in the primary coil winding to the number of turns in the secondary coil winding.
[0034] It should be noted that one end of the ferrite 310 passes sequentially through the center of the first copper foil coil 331, the second copper foil coil 332 and the third copper foil coil 333 from the front of the first substrate, and extends to the back of the third substrate. The other end of the ferrite 310 passes through the center of the fourth copper foil coil 321 from the front of the first substrate, and extends to the back of the third substrate and connects with one end of the ferrite 310.
[0035] In some embodiments, refer to Figure 1 , Figure 3 , Figure 4 The drive module 200 includes: a controller 210, a first limiting unit 220, and a second limiting unit 230; the input terminal of the controller 210 is connected to the control module 100, and the first output terminal and the second output terminal of the controller 210 are both connected to the primary coil winding of each transformer module 300; the first limiting unit 220 is connected to the first output terminal of the controller 210; and the second limiting unit 230 is connected to the second output terminal of the controller 210.
[0036] It should be noted that the controller 210 is used to generate a second signal between the first output terminal and the second output terminal based on the first signal. If the voltage output by the first output terminal exceeds the limiting value of the first limiting unit 220, the first limiting unit 220 can bypass the excess portion to the bleed branch, so that the amplitude of the signal component output by the first output terminal is limited to a safe range. In addition, if the voltage output by the second output terminal exceeds the limiting value of the second limiting unit 230, the second limiting unit 230 can bypass the excess portion to the bleed branch, so that the amplitude of the signal component output by the second output terminal is limited to a safe range. This achieves overvoltage protection for the overall AC pulse signal (second signal), which helps to avoid damage to the transformer module 300 connected to the drive module 200, or to prevent the amplitude of the third signal after the transformer module 300 connected to the drive module 200 transforms the second signal from being too high, thereby damaging the IGBT unit 510.
[0037] In some embodiments, refer to Figure 4The switch control circuit also includes: a low-voltage DC power supply terminal, which is connected to the drive module 200 and is used to supply power to the drive module 200; the first limiting unit 220 includes: a first diode D1 and a second diode D2, the anode of the first diode D1 is connected to the first output terminal of the controller 210, and the cathode of the first diode D1 is connected to the low-voltage DC power supply terminal; the anode of the second diode D2 is connected to the low-voltage DC power supply terminal, and the cathode of the second diode D2 is connected to the first output terminal of the controller 210.
[0038] For example, the switch control circuit further includes an energy storage module, with a low-voltage DC power supply terminal connected to the energy storage module, thereby providing power to the drive module 200 through the low-voltage DC power supply terminal.
[0039] For example, the energy storage module consists of multiple battery cells, and the number of battery cells in the energy storage module can be appropriately adjusted according to the power supply of the drive module 200.
[0040] For example, refer to Figure 4 The low-voltage DC power supply includes a first power supply terminal VOUT1 and a second power supply terminal VOUT2. The energy storage module is connected to the first power supply terminal VOUT1, the second power supply terminal VOUT2 and the ground terminal respectively. The first power supply terminal VOUT1 is used to provide a first power supply (e.g., positive 15V), and the second power supply terminal VOUT2 is used to provide a second power supply (e.g., negative 15V). The cathode of the first diode D1 is connected to the first power supply terminal VOUT1, and the anode of the second diode D2 is connected to the second power supply terminal VOUT2.
[0041] It should be noted that the anode of the first diode D1 is connected to the first output terminal of the controller 210, and the cathode of the first diode D1 is connected to the first power supply terminal VOUT1; the anode of the second diode D2 is connected to the second power supply terminal VOUT2, and the cathode of the second diode D2 is connected to the first output terminal of the controller 210. If the voltage output from the first output terminal exceeds the voltage value corresponding to the first power supply, the first diode D1 conducts, discharging the excess energy to the first power supply terminal VOUT1. If the voltage output from the first output terminal exceeds the voltage value corresponding to the second power supply, the second diode D2 conducts, discharging the excess energy to the second power supply terminal VOUT2, thereby limiting the amplitude of the signal component output from the first output terminal to a safe range.
[0042] In some embodiments, refer to Figure 4The second limiting unit 230 includes a fourth diode D4 and a fifth diode D5. The anode of the fourth diode D4 is connected to the first output terminal of the controller 210, and the cathode of the fourth diode D4 is connected to the low-voltage DC power supply terminal. The anode of the fifth diode D5 is connected to the low-voltage DC power supply terminal, and the cathode of the fifth diode D5 is connected to the first output terminal of the controller 210.
[0043] For example, the low-voltage DC power supply includes a first power supply terminal VOUT1 and a second power supply terminal VOUT2. The energy storage module is connected to the first power supply terminal VOUT1, the second power supply terminal VOUT2, and a ground terminal, respectively. The first power supply terminal VOUT1 is used to provide a first power supply (e.g., positive 15V), and the second power supply terminal VOUT2 is used to provide a second power supply (e.g., negative 15V). The cathode of the fourth diode D4 is connected to the first power supply terminal VOUT1, and the anode of the fifth diode D5 is connected to the second power supply terminal VOUT2. If the voltage output by the second output terminal exceeds the voltage value corresponding to the first power supply, the fourth diode D4 conducts, discharging the excess energy to the first power supply terminal VOUT1. If the voltage output by the second output terminal exceeds the voltage value corresponding to the second power supply, the fifth diode D5 conducts, discharging the excess energy to the second power supply terminal VOUT2, thereby limiting the amplitude of the signal component output by the second output terminal to a safe range.
[0044] In some embodiments, the switch control circuit further includes a voltage regulator module, the input terminal of which is connected to the first power supply terminal VOUT1, and the output terminal of which is connected to the control module 100. The voltage regulator module is used to reduce the first power supply output from the first power supply terminal VOUT1 to form a third power supply, which is then supplied to the control module 100.
[0045] Preferably, the first power supply is 15V and the third power supply is 5V. In this application, the voltage of the first power supply and the second power supply are not limited too much.
[0046] In some embodiments, refer to Figure 3 , Figure 4 The drive module 200 further includes a first filter unit 240 and a second filter unit 250; the first filter unit 240 is connected to the first output terminal of the controller 210 and the primary coil winding of each transformer module 300 respectively; the second filter unit 250 is connected to the second output terminal of the controller 210, the primary coil winding of each transformer module 300 and the first filter unit 240 respectively.
[0047] It is understandable that by setting the first filter unit 240 and the second filter unit 250 at the output of the controller 210, noise in the output signal can be filtered out, thereby ensuring that the switching control circuit operates more stably and reliably.
[0048] In some embodiments, refer to Figure 4 The first filter unit 240 includes: a first capacitor C1 and a first resistor R1; one end of the first capacitor C1 is connected to the first output terminal of the controller 210, and the other end of the first capacitor C1 is connected to the primary coil winding of each transformer module 300; one end of the first resistor R1 is connected to the other end of the first capacitor C1, and the other end of the first resistor R1 is connected to the second filter unit 250.
[0049] It should be noted that, compared to the scheme where the control module 100 directly outputs a DC control signal and transmits it to other signal conversion modules for voltage boosting, and then the signal conversion modules transmit the boosted DC control signal to the IGBT switching module 500 to control the on / off switching of the high-voltage DC power supply to the electrical equipment, in this application, the control module 100 outputs a first signal (a weak current pulse signal), which is then sequentially converted by the drive module 200, transformer module 300, and rectifier module 400 to form a fourth signal (a DC signal adapted to control the on / off switching of the IGBT unit 510). If the control module 100 malfunctions... Instead of a pulse signal, the DC signal is output. The DC signal is transformed by the controller 210 in the drive module 200, and a higher level DC signal component is output from the first output terminal of the controller 210. Since the first output terminal of the controller 210 is connected to the first capacitor C1, the first capacitor C1 has the function of isolating DC. The DC signal component cannot be further transmitted to the transformer module 300, the rectifier module 400 and the IGBT unit 510. Therefore, the IGBT unit 510 will not be accidentally turned on due to the abnormal operation of the control module 100. This helps to improve the reliability of the switch control circuit, avoid energy waste, and prevent the electrical equipment from being damaged by high voltage for a long time.
[0050] In some embodiments, refer to Figure 4 The second filter unit 250 includes a second capacitor C2 and a third resistor R3; one end of the second capacitor C2 is connected to the second output terminal of the controller 210, and the other end of the second capacitor C2 is connected to the primary coil winding of each transformer module 300; one end of the third resistor R3 is connected to the other end of the second capacitor C2, and the other end of the third resistor R3 is connected to the other end of the first resistor R1.
[0051] It should be noted that by setting the first capacitor C1 and the second capacitor C2 to block DC from the output signal component, it is beneficial to ensure the normal operation of the transformer module 300, the complete signal transmission, and the reliability of operation. Specifically, after the DC blocking, the complete pulse AC component passes through the transformer module 300, and the secondary coil winding outputs a signal synchronized with the primary coil winding, ensuring that the IGBT unit is turned on or off according to the set timing. In addition, setting the first capacitor C1 and the second capacitor C2 helps to prevent the controller 210 from burning out due to the feedback of DC components to the output of the drive module 200 when other modules malfunction, thereby ensuring the stability of the controller 210's operation.
[0052] In some embodiments, refer to Figure 4 The rectifier module 400 includes: a third diode D3 and a second resistor R2; the anode of the third diode D3 is connected to the secondary coil winding, and the cathode of the third diode D3 is connected to the IGBT unit 510; one end of the second resistor R2 is connected to the cathode of the third diode D3, and the other end of the second resistor R2 is connected to the secondary coil winding and the IGBT unit 510 respectively.
[0053] It should be noted that the third diode D3 and the second resistor R2 form a rectifier module 400, which is used to convert the third signal (alternating signal) output from the secondary coil winding into a fourth signal (DC signal), and then transmit it to the IGBT unit 510 to control the on and off of the IGBT unit 510.
[0054] In some embodiments, refer to Figure 5 The switching control circuit also includes a current limiting module 600; the current limiting module 600 is connected to the input terminal IN of the IGBT switching module 500 and the high-voltage DC power supply respectively; the IGBT switching module 500 also includes multiple current limiting units 520, and any two adjacent IGBT units 510 are connected through at least one current limiting unit 520.
[0055] It should be noted that the high-voltage DC power supply, the current limiting module 600, multiple current limiting units 520, multiple IGBT units 510 in the IGBT switching module 500, and the electrical equipment are connected in series to form a circuit. By setting the current limiting module 600 and multiple current limiting units 520, the circuit can be divided, which helps to prevent the output voltage of the IGBT unit 510 from being too high and damaging the electrical equipment.
[0056] For example, refer to Figure 4The current limiting module 600 includes a fourth resistor R4, which is connected to the input terminal IN of the IGBT switching module 500 and the high-voltage DC power supply, respectively. At the moment when the IGBT switching module 500 is turned on, the switching control circuit may generate a large instantaneous current that far exceeds the device's tolerance. By setting the fourth resistor R4 to limit the current, the high-voltage DC power supply will not directly pass through the IGBT switching module 500 and the electrical equipment, which helps to prevent the IGBT switching module 500 and the electrical equipment from being burned out.
[0057] For example, refer to Figure 4 The current limiting unit 520 includes a fifth resistor R5, which is connected to two adjacent IGBT units 510. At the moment when the IGBT switching module 500 is turned on, the switching control circuit may generate a large instantaneous current that far exceeds the device's tolerance. By setting the fifth resistor R5 to limit the current, it is beneficial to prevent the IGBT unit 510 from being burned out.
[0058] In some embodiments, refer to Figure 5 The switch control circuit also includes a communication module 700, which is connected to the control module 100 and the host computer to enable the control module 100 to communicate remotely with the host computer.
[0059] Understandably, the control module 100 enables remote communication with the host computer, improving the convenience of management.
[0060] For example, the host computer outputs a parameter adjustment signal to the communication module 700, which then transmits the parameter adjustment signal to the control module 100 to adjust the frequency of the first signal, thereby adjusting the pull-in speed of the IGBT unit 510; or, the host computer outputs a start / stop signal to the communication module 700, which then transmits the start / stop signal to the control module 100, so that the control module 100 outputs the first signal or stops outputting the first signal, thereby controlling the on / off state of the IGBT unit 510.
[0061] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.
[0062] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0063] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.
[0064] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A switch control circuit, applied in a power supply system, the power supply system including a high-voltage DC power supply and electrical equipment, characterized in that, The switch control circuit includes: The control module is used to output the first signal; A driving module, the input terminal of which is connected to the control module, is used to perform level conversion on the first signal to form a second signal; Multiple transformer modules are integrated on a circuit board. Each transformer module includes a ferrite core and primary and secondary coil windings wound around both ends of the ferrite core. The primary and secondary coil windings are embedded in the circuit board. The primary coil winding is connected to the drive module and is used to transform the second signal to form a third signal. Multiple rectifier modules are connected to the secondary coil winding and are used to rectify the third signal to form a fourth signal; The IGBT switching module has its input terminal connected to the high-voltage DC power supply and its output terminal connected to the electrical equipment. The IGBT switching module includes multiple IGBT units connected in series. The IGBT units are connected to the rectifier module and are used to control the switching of the high-voltage DC power supply to the electrical equipment according to the fourth signal.
2. The switch control circuit according to claim 1, characterized in that, The circuit board includes a first substrate, a second substrate, and a third substrate stacked sequentially, and the secondary coil winding includes: A first copper foil coil is disposed on the first substrate. A first via is provided in the first substrate. The starting end of the first copper foil coil is connected to the rectifier module, and the ending end of the first copper foil coil is connected to the first via. The second copper foil coil is disposed on the second substrate. The starting end of the second copper foil coil is connected to the ending end of the first copper foil coil through the first via. The second substrate is provided with a second via, and the ending end of the second copper foil coil is connected to the second via. The third copper foil coil is disposed on the third substrate. The starting end of the third copper foil coil is connected to the ending end of the second copper foil coil through the second via. The ending end of the third copper foil coil is connected to the rectifier module.
3. The switch control circuit according to claim 2, characterized in that, The primary coil winding includes: A fourth copper foil coil is disposed in any one of the first substrate, the second substrate, and the third substrate, and the fourth copper foil coil is connected to the driving module.
4. The switch control circuit according to claim 1, characterized in that, The driving module includes: The controller has its input terminal connected to the control module, and its first output terminal and second output terminal are both connected to the primary coil winding of each transformer module. A first limiting unit is connected to the first output terminal of the controller; The second limiting unit is connected to the second output terminal of the controller.
5. The switch control circuit according to claim 4, characterized in that, The switch control circuit also includes: A low-voltage DC power supply terminal is connected to the drive module and is used to supply power to the drive module. The first limiting unit includes: The first diode has its anode connected to the first output terminal of the controller and its cathode connected to the low-voltage DC power supply terminal. The second diode has its anode connected to the low-voltage DC power supply terminal and its cathode connected to the first output terminal of the controller.
6. The switch control circuit according to claim 4, characterized in that, The driver module also includes: The first filtering unit is connected to the first output terminal of the controller and the primary coil winding of each transformer module. The second filtering unit is connected to the second output terminal of the controller, the primary coil winding of each transformer module, and the first filtering unit.
7. The switch control circuit according to claim 6, characterized in that, The first filtering unit includes: A first capacitor, one end of which is connected to the first output terminal of the controller, and the other end of which is connected to the primary coil winding of each transformer module; A first resistor, one end of which is connected to the other end of the first capacitor, and the other end of which is connected to the second filter unit.
8. The switch control circuit according to claim 1, characterized in that, The rectifier module includes: The third diode has its anode connected to the secondary coil winding and its cathode connected to the IGBT unit. The second resistor has one end connected to the cathode of the third diode, and the other end connected to the secondary coil winding and the IGBT unit.
9. The switch control circuit according to claim 1, characterized in that, The switch control circuit also includes: A current limiting module is connected to both the input terminal of the IGBT switching module and the high-voltage DC power supply. The IGBT switching module also includes: Multiple current limiting units are provided, and any two adjacent IGBT units are connected through at least one of the current limiting units.
10. The switch control circuit according to claim 1, characterized in that, The switch control circuit also includes: A communication module is provided, which is connected to both the control module and the host computer, enabling the control module to communicate remotely with the host computer.