A cross-clamped IGCT power module
By introducing cross-clamp IGCT power modules into the half-bridge circuit topology, the problems of low utilization rate of the converter power module and difficulty in DC short circuit removal in the prior art are solved, and the advantages of DC fault self-clearing and cost and volume are realized. Improves system reliability and design simplification.
Patent Information
- Application Number
- CN202010149785.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-03-06
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2040-03-06
AI Technical Summary
In the circuit topology of existing inverter power modules, especially the full bridge topology, the switching devices have low utilization, large operating losses, high volume and cost, and the half-bridge module cannot quickly remove DC short circuit faults.
The cross-clamp IGCT power module is introduced into the half-bridge circuit topology. The electrical series connection of adjacent power modules and the self-blocking of DC fault current are realized through the cross-clamp circuit, module controller and switching power circuit, and the bridge arm reactor is reduced The saturated current design reduces the DC-side current rise rate, reduces the configuration or removes the DC circuit breaker, and achieves the advantages of small number of devices, small modules and low cost.
It realizes the DC fault self-clearing function, reduces the complexity of system design and hardware costs, improves system reliability, reduces on-site debugging and operation and maintenance workload, and has a variety of protection functions such as temperature protection, power supply power outage alarms, etc.
Smart Images
Figure CN111371300B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power electronics, and more specifically, to a cross-clamped IGCT power module. Background Art
[0002] At present, the circuit topologies of converter power modules are mainly half-bridge and full-bridge. The converter valve of the full-bridge topology can block DC short-circuit fault current, while the DC short-circuit fault current cannot be isolated between the AC power supply and the short-circuit point due to the freewheeling effect of the anti-parallel diode of the half-bridge sub-module. However, the converter switching device utilization rate of the full-bridge module is not high, the operating loss is large, the power module is large in size, the whole machine occupies a large area, and the manufacturing cost is relatively high.
[0003] The half-bridge converter has advantages in size and cost, but cannot quickly eliminate DC short-circuit faults. Summary of the invention
[0004] The present invention provides a cross-clamped IGCT power module, which realizes the electrical series connection and clamping function of adjacent power modules and the self-blocking of direct current fault current.
[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:
[0006] A cross-clamped IGCT power module is connected in series in a half-bridge circuit topology, comprising a cross-clamp circuit, a module controller and a switch power supply loop, wherein the cross-clamp circuit is connected in series in the half-bridge circuit, the cross-clamp circuit is connected to the module controller, the clamping function of the cross-clamp circuit is controlled by the module controller, the module controller is connected to the switch power supply loop, and the switch power supply loop provides power for the module controller to work.
[0007] In the above scheme, after adopting the half-bridge topology circuit with cross clamping, the function of self-clearing of DC fault can be realized, and the volume and cost advantages of the half-bridge topology can be taken into account. The addition of cross-clamping power modules in the half-bridge topology circuit can reduce the saturation current design index of the bridge arm reactor, and can effectively limit the rising rate of the DC side current. The line can reduce the number of DC circuit breakers or DC current limiting reactors, thereby achieving the advantages of a small total number of components, a small power module, low cost, and high system reliability.
[0008] Preferably, the cross-clamping circuit includes an IGCT device, a first fast recovery diode and a second fast recovery diode, wherein the cathode of the IGCT device is short-circuited with the anode of the first fast recovery diode, the cathode of the first fast recovery diode and the anode of the IGCT device are short-circuited, the cathode and anode of the IGCT device are respectively led out to a negative copper bar and a positive copper bar, and the first negative copper bar and the first positive copper bar wiring holes are prepared; the cathode and anode of the second fast recovery diode are respectively led out to a second negative copper bar and a second positive copper bar, and the second negative copper bar and the second positive copper bar wiring holes are prepared.
[0009] Preferably, the switching power supply circuit includes a 35V power supply circuit and a 32V power supply circuit.
[0010] Preferably, the 35V power supply circuit includes an external 220Vac power supply, a 35Vdc power module, an AC miniature circuit breaker, an isolation transformer, and a diode D3. The external 220Vac power supply lines are respectively connected to the exposed wiring terminals L / N, and the L / N terminals are connected to the L / N terminals corresponding to the AC miniature circuit breaker and the L / N terminals corresponding to the isolation transformer in turn. The L / N interface on the secondary side of the isolation transformer output is led to the input port of the 35Vdc power module, the positive electrode on the output side of the 35Vdc power module is led out to the anode terminal of the diode D3, and the negative electrode on the output side of the 35Vdc power module is directly led out to the external terminal.
[0011] Preferably, the 32V power supply circuit includes a 32Vdc switching power supply module and a diode D4, the 32Vdc power supply input port is exposed to the outside, the input port is directly connected to the 32Vdc switching power supply module, the positive electrode on the output side of the 32Vdc power supply module is connected to the anode terminal of the diode D4, the negative electrode on the output side of the 32Vdc power supply module is connected to the external terminal, the anode of the diode D3 and the anode of the diode D4 are short-circuited together, and a common positive bus port is connected to the external terminal.
[0012] The switch power supply circuit adopts a dual-power redundant power supply mode to further improve the power supply reliability. One of the two power supplies is from an external 220Vac, and the other is from the DC bus voltage of the adjacent power module. The two power supplies are completely independent and in online hot standby state. In order to ensure that the external power supply is used first and does not affect the static balance of the voltage of the conventional half-bridge power module, the output voltage of the external power supply circuit is 35Vdc, and the output voltage of the high-potential energy-taking circuit is 32Vdc.
[0013] Preferably, the module controller includes an internal working power supply circuit, controller uplink and downlink communication interfaces, IGCT device communication and drive circuit, two hard node fault alarm circuits and a temperature control switch alarm circuit, three DC voltage analog quantity acquisition circuits and a hard overvoltage detection circuit.
[0014] Preferably, the module controller can control the on and off of the IGCT device. The module controller has IGCT over-temperature protection, DC over-voltage protection, and switching power supply fault alarm. The DC over-voltage protection threshold is 1400V, and the IGCT temperature protection threshold is 100°C. When the protection threshold is reached, the protection is activated and the module controller will execute the IGCT pulse sealing instruction to cut off the fault current in the module. At the same time, the module controller uses the uplink communication optical fiber to send the protection information to the central controller, and the central controller determines whether to trip the external AC switch or DC switch according to the current system operating conditions.
[0015] Preferably, the three DC voltage detection circuits simultaneously package and transmit the data collected by each of them to the module controller through the uplink communication optical fiber. The module controller has the functions of automatic analog quantity screening and acquisition fault protection, and performs "three out of two" and "two out of one" anti-error design to avoid a single analog quantity failure causing the module controller to trigger protection.
[0016] Preferably, after the cross-clamped IGCT power module detects IGCT fault information, it will execute the IGCT pulse sealing instruction and send the fault information to the central controller. The central controller will trip the external interconnection line switch and the DC side switch to protect the equipment. The cross-clamped IGCT power module is connected in series in the half-bridge circuit topology. When a DC bipolar short circuit occurs, the central controller detects abnormal changes in external voltage and current, and quickly locks the half-bridge module and the IGCT module. The cross-clamped IGCT power module realizes the clamping function and quickly isolates the fault current within microseconds.
[0017] Preferably, it also includes a heat sink and press-fit accessories, wherein the press-fit accessories include a cast steel pressure plate, a disc spring, a spring seat and a copper busbar, the heat sink includes a first aluminum plate heat sink, a second aluminum plate heat sink and a third aluminum plate heat sink, disc springs and spring seats are respectively arranged on the inner sides of the cast steel pressure plate, the cathode of the IGCT device and the anode of the first fast recovery diode are inserted between the first aluminum plate heat sink and directly press-fitted together, the anode of the IGCT device is press-fitted to the first aluminum plate heat sink, the cathode of the first fast recovery diode is press-fitted to the second aluminum plate heat sink, the anode of the IGCT device and the cathode of the first fast recovery diode are short-circuited together with the copper busbar, and then the positive copper busbar is led out from the anode aluminum plate heat sink of the IGCT device, and the negative copper busbar is led out from the cathode aluminum plate heat sink of the IGCT device; the anode and cathode of the second fast recovery diode are press-fitted to the third aluminum plate heat sink, and the positive copper busbar is led out from the third aluminum plate heat sink, and the negative copper busbar is led out from the cathode aluminum plate heat sink.
[0018] The cross-clamp circuit IGCT power module proposed in the above scheme integrates the IGCT device and its driving circuit, fast recovery diode device, switching power supply circuit, module controller, etc. into one module. The module can operate independently. The module has two pairs of DC input ports and DC output ports. The two pairs of ports are completely independent electrically, and can realize the electrical series connection and clamping function of adjacent power modules. When the converter valve is operating normally, the forward current and reverse current flow are realized through the IGCT device and its anti-parallel fast recovery diode. When a short circuit occurs on the DC pole line side of the converter valve, the cross-clamp module and the conventional IGBT power module will be completely locked, and the short-circuit current will be freewheeling through two cross-fast recovery diodes. When the voltage of the power module adjacent to the cross-clamp circuit is higher than the voltage of the conventional power module, the DC fault current is self-blocked.
[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:
[0020] The cross-clamped IGCT power module of the present invention is a cross circuit, which is connected in series in the main circuit of the half-bridge topology converter valve, and connects the outlet copper bars of the DC bus capacitors of the left and right adjacent power modules. It is independent of the conventional half-bridge module and does not interfere with each other. Compared with the converter valve in the full-bridge topology form, it has cost advantages and volume advantages, and also has the ability to block DC fault current, and has multiple protection functions such as temperature protection, power failure alarm, and overvoltage protection. The module controller can also receive control instructions from the upper-level controller, especially can cooperate with the DC pole line short-circuit protection function of the converter valve. When the converter valve is operating normally, the IGCT device and the diode device are in a long-term conduction mode, and the upper-level controller does not need to add additional control algorithms. When a short-circuit fault occurs in the DC pole line, the upper-level controller sends a locking control instruction, and the module controller quickly realizes the locking of the power device, which can cut off the DC short-circuit fault current within a microsecond level time. After adding this cross-clamp module, the external circuit of the converter valve does not need to be equipped with a DC smoothing reactor or DC circuit breaker. The converter valve body has the ability to switch short-circuit current, which reduces the complexity of system design, reduces the design workload, saves the project hardware manufacturing cost, and also reduces the workload of on-site debugging and subsequent operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 Schematic diagram of a cross-clamped IGCT power module.
[0022] Figure 2 Schematic diagram of the cross-clamping circuit of the cross-clamped IGCT power module.
[0023] Figure 3 Schematic diagram of the module controller of the cross-clamped IGCT power module.
[0024] Figure 4Schematic diagram of the switching power supply circuit of the cross-clamped IGCT power module. DETAILED DESCRIPTION
[0025] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;
[0026] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;
[0027] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0029] Example 1
[0030] This embodiment provides a cross-clamped IGCT power module, such as Figures 1 to 4 , connected in series in a half-bridge circuit topology, including a cross-clamp circuit, a module controller and a switching power supply loop, wherein the cross-clamp circuit is connected in series in the half-bridge circuit, the cross-clamp circuit is connected to the module controller, the clamping function of the cross-clamp circuit is controlled by the module controller, the module controller is connected to the switching power supply loop, and the switching power supply loop provides power for the module controller to work.
[0031] The cross-clamping circuit includes an IGCT device, a first fast recovery diode and a second fast recovery diode, wherein the cathode of the IGCT device is short-circuited with the anode of the first fast recovery diode, the cathode of the first fast recovery diode is short-circuited with the anode of the IGCT device, the cathode and anode of the IGCT device are respectively led out to a negative copper bar and a positive copper bar, and the first negative copper bar and the first positive copper bar have female wiring holes; the cathode and anode of the second fast recovery diode are respectively led out to a second negative copper bar and a second positive copper bar, and the second negative copper bar and the second positive copper bar have female wiring holes.
[0032] The switch power supply circuit includes a 35V power supply circuit and a 32V power supply circuit.
[0033] The 35V power supply circuit includes an external 220Vac power supply, a 35Vdc power module, an AC miniature circuit breaker, an isolation transformer, and a diode D3. The external 220Vac power supply lines are respectively connected to the exposed wiring terminals L / N, and the L / N are connected to the L / N terminals corresponding to the AC miniature circuit breaker and the L / N terminals corresponding to the isolation transformer in turn. The L / N interface on the secondary side of the isolation transformer output is led to the input port of the 35Vdc power module, the positive electrode on the output side of the 35Vdc power module is led out to the anode terminal of the diode D3, and the negative electrode on the output side of the 35Vdc power module is directly led out to the external terminal.
[0034] The 32V power supply circuit includes a 32Vdc switching power supply module and a diode D4. The 32Vdc power supply input port is exposed to the outside, and the input port is directly connected to the 32Vdc switching power supply module. The positive electrode on the output side of the 32Vdc power supply module is connected to the anode terminal of the diode D4, and the negative electrode on the output side of the 32Vdc power supply module is connected to the external terminal. The anode of the diode D3 and the anode of the diode D4 are short-circuited together, and a common positive bus port is connected to the external terminal.
[0035] The module controller includes an internal working power supply circuit, controller uplink and downlink communication interfaces, IGCT device communication and drive circuit, two hard node fault alarm circuits and a temperature control switch alarm circuit, three DC voltage analog quantity acquisition circuits and a hard overvoltage detection circuit.
[0036] The module controller can control the on and off of the IGCT device. The module controller has IGCT over-temperature protection, DC over-voltage protection, and switching power supply fault alarm. The DC over-voltage protection threshold is 1400V, and the IGCT temperature protection threshold is 100℃. When the protection threshold is reached, the protection action is activated and the module controller will execute the IGCT pulse sealing instruction to cut off the fault current in the module. At the same time, the module controller uses the uplink communication optical fiber to send the protection information to the central controller, and the central controller determines whether to trip the external AC switch or DC switch according to the current system operating conditions.
[0037] The three DC voltage detection circuits simultaneously transmit their collected data in packages to the module controller through the uplink communication optical fiber. The module controller has the functions of automatic analog quantity screening and acquisition fault protection, and performs "three out of two" and "two out of one" anti-error design to avoid a single analog quantity failure causing the module controller to trigger protection.
[0038] After the cross-clamped IGCT power module detects IGCT fault information, it will execute the IGCT pulse sealing instruction and send the fault information to the central controller. The central controller will trip the external interconnection line switch and the DC side switch to protect the equipment. The cross-clamped IGCT power module is connected in series in the half-bridge circuit topology. When a DC bipolar short circuit occurs, the central controller detects abnormal changes in external voltage and current, and quickly locks the half-bridge module and IGCT module. The cross-clamped IGCT power module realizes the clamping function and quickly isolates the fault current within microseconds.
[0039] It also includes a heat sink and press-fit accessories, wherein the press-fit accessories include a cast steel pressure plate, a disc spring, a spring seat and a copper busbar. The heat sink includes a first aluminum plate heat sink, a second aluminum plate heat sink and a third aluminum plate heat sink. Disc springs and spring seats are respectively arranged on the inner sides of the cast steel pressure plate. The cathode of the IGCT device and the anode of the first fast recovery diode are directly pressed together after being inserted between the first aluminum plate heat sink. The anode of the IGCT device is pressed onto the first aluminum plate heat sink, and the cathode of the first fast recovery diode is pressed onto the second aluminum plate heat sink. The anode of the IGCT device and the cathode of the first fast recovery diode are short-circuited together with a copper busbar, and then the positive copper busbar is led out from the anode aluminum plate heat sink of the IGCT device, and the negative copper busbar is led out from the cathode aluminum plate heat sink of the IGCT device; the anode and cathode of the second fast recovery diode are pressed onto the third aluminum plate heat sink, and the positive copper busbar is led out from the third aluminum plate heat sink, and the negative copper busbar is led out from the cathode aluminum plate heat sink.
[0040] In the specific implementation process, the cross clamp circuit is mainly implemented by one IGCT device and two fast recovery diode devices. The IGCT is connected in anti-parallel with one of the diode devices to realize the forward current circulation loop; the other diode alone forms the reverse current circulation loop;
[0041] The common DC bus switching power supply circuit is mainly composed of an isolation transformer, a 35VDC switching power supply and a 32VDC switching power supply. The 35VDC switching power supply is an external power supply mode. The external power line passes through an isolation transformer and then connected to the internal input port of the 35Vdc power supply. The 35VDC power supply is actually two independent power supply loops. After the output side is connected in parallel, it is output to an external port through an anti-reverse diode.
[0042] The 32VDC switching power supply takes energy from high potential and also adopts a two-way 32VDC power supply circuit design. The output side is connected in parallel and outputs one external port through an anti-reverse diode. The 35VDC and 32VDC output ports are connected in parallel to form a DC bus to provide DC power to the outside. The switching power supply has short-circuit self-recovery, over-power protection and fault alarm functions;
[0043] The module controller mainly includes an IGCT trigger pulse sending interface and a fault pulse receiving interface, IGCT temperature data acquisition, fault alarm node status monitoring of the switching power supply, three DC voltage acquisition circuits, one DC overvoltage protection circuit, two working power supply interfaces, a program download interface, and a pair of optical fiber transceiver interfaces for communicating with the upper-level controller.
[0044] The module controller has the functions of automatic screening of multi-channel analog quantities and self-identification of faults for protection, and can automatically determine whether an analog quantity acquisition fault occurs based on the three-channel DC voltages acquired.
[0045] The module controller has a short-circuit protection function, and automatically shuts down the IGCT when an IGCT failure or a low voltage of the module is detected, thereby achieving rapid protection locking at a microsecond level.
[0046] The water-cooled heat sink and press-fit assembly mainly include a water-cooled radiator and a copper busbar. The water-cooled radiator is made of aluminum. The water-cooled heat sink is directly press-fitted with the press-fit device. One side of the water-cooled heat sink is a water nozzle that can be connected to an external water cooling pipeline, and the other side is connected to the copper busbar to realize the external connection of the press-fitted IGCT or fast recovery diode.
[0047] The cross-clamped IGCT power module is a cross-circuit, and the main circuit topology is as follows: Figure 2 As shown, a press-fit installation and fixing method is adopted, which is mainly composed of an IGCT device, a fast recovery diode device and a water-cooled heat sink, etc. One IGCT device and two fast recovery diode devices are press-fitted together through a water-cooled heat sink and an insulating block. A heat sink is pressed onto the negative electrode of the IGCT, and the heat sink is pressed onto the positive electrode of the fast recovery diode D2 at the same time. The positive heat sink of the IGCT and the negative heat sink of the fast recovery diode D2 are short-circuited together through a copper busbar. The negative heat sink of D2 is pressed onto a disc spring and a disc spring seat through an insulating block. The positive heat sink and the negative heat sink of the IGCT device lead out a positive copper busbar UDC2+ and a negative copper busbar UDC1- respectively. The negative heat sink of another fast recovery diode D1 is pressed onto the positive heat sink of the IGCT through an insulating block. The positive heat sink of D1 is pressed onto a disc spring and a disc spring seat through an insulating block. The positive heat sink and the negative heat sink of D1 lead out a positive copper busbar UDC2- and a negative copper busbar UDC1+ respectively.
[0048] The layout of each interface of the module controller is as follows Figure 3 As shown, the module controller adopts a full metal shell, in which the upper controller optical fiber interface, IGCT device control interface, working power interface, working power alarm node interface, temperature acquisition interface, voltage analog acquisition interface, and curing program interface are exposed to the outside, and other positions are all encapsulated in a metal box. The controller shell is installed and fixed on the upper part of the module's insulating bracket.
[0049] Power supply circuit wiring Figure 4 As shown, all components including 35Vdc switching power supply, 32Vdc switching power supply, input side switch, isolation transformer, anti-reverse diode, etc. are installed on the aluminum-zinc plate. The aluminum-zinc plate is used for overall packaging to form a power supply box, which is fixed on the upper part of the insulating bracket of the cross-clamp module. The external 220Vac power supply line is connected to the exposed wiring terminals L / N of the power box, and L / N is connected to the corresponding L / N terminals of the AC miniature circuit breaker and the isolation transformer in turn. Then, the L / N interface on the secondary side of the isolation transformer is connected to the input port of the 35Vdc power module. The positive electrode of the output side of the 35Vdc power module is connected to the anode terminal of the diode D3, and the negative electrode of the output side of the 35Vdc power module is directly connected to the external terminal of the power box; the 32Vdc power input port is exposed outside the power box, and the input port is directly connected to the 32Vdc switching power module. The positive electrode of the output side of the 32Vdc power module is connected to the anode terminal of the diode D4, and the negative electrode of the output side of the 32Vdc power module is directly connected to the external terminal of the power box. The anode of the diode D3 and the anode of the diode D4 are short-circuited together, and a common positive bus port is connected to the external terminal of the power box.
[0050] The same or similar reference numerals correspond to the same or similar components;
[0051] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;
[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.
Claims
1. A cross-clamped IGCT power module, connected in series in a half-bridge circuit topology, It is characterized in that It includes a cross clamp circuit, a module controller and a switch power supply circuit, wherein the cross clamp circuit is connected in series in a half-bridge circuit, the cross clamp circuit is connected to the module controller, the clamping function of the cross clamp circuit is controlled by the module controller, the module controller is connected to the switch power supply circuit, and the switch power supply circuit provides power for the module controller to work; The cross-clamp circuit comprises an IGCT device, a first fast recovery diode and a second fast recovery diode, wherein the cathode of the IGCT device is short-circuited with the anode of the first fast recovery diode, the cathode of the first fast recovery diode is short-circuited with the anode of the IGCT device, the cathode and anode of the IGCT device are respectively led out to a first negative copper bar and a first positive copper bar, and the first negative copper bar and the first positive copper bar have female wiring holes; the cathode and anode of the second fast recovery diode are respectively led out to a second negative copper bar and a second positive copper bar, and the second negative copper bar and the second positive copper bar have female wiring holes; The module controller controls the on and off of the IGCT device. The module controller has IGCT over-temperature protection, DC over-voltage protection, and switching power supply fault alarm. The DC over-voltage protection threshold is 1400V, and the IGCT temperature protection threshold is 100℃. When the protection threshold is reached, the protection action is activated and the module controller will execute the IGCT pulse sealing instruction to cut off the fault current in the module. At the same time, the module controller uses the uplink communication optical fiber to send the protection information to the central controller, and the central controller determines whether to trip the external AC switch or DC switch according to the current system operating conditions.
2. The cross-clamped IGCT power module according to claim 1, It is characterized in that The switch power supply circuit includes a 35V power supply circuit and a 32V power supply circuit.
3. The cross-clamped IGCT power module according to claim 2, It is characterized in that The 35V power supply circuit includes an external 220Vac power supply, a 35Vdc power module, an AC miniature circuit breaker, an isolation transformer, and a diode D3. The external 220Vac power supply lines are respectively connected to the exposed wiring terminals L / N, and the L / N are connected to the L / N terminals corresponding to the AC miniature circuit breaker and the L / N terminals corresponding to the isolation transformer in turn. The L / N interface on the secondary side of the isolation transformer output is led to the input port of the 35Vdc power module, the positive electrode on the output side of the 35Vdc power module is led out to the anode terminal of the diode D3, and the negative electrode on the output side of the 35Vdc power module is directly led out to the external terminal.
4. The cross-clamped IGCT power module according to claim 3, It is characterized in that The 32V power supply circuit includes a 32Vdc switching power supply module and a diode D4. The input end of the 32Vdc switching power supply module is exposed to the outside, the positive electrode of the output side of the 32Vdc switching power supply module is led out to the anode terminal of the diode D4, the negative electrode of the output side of the 32Vdc switching power supply module is led out to the external terminal, the anode of the diode D3 and the anode of the diode D4 are short-circuited together, and a common positive bus port is led out to be connected to the external terminal.
5. The cross-clamped IGCT power module according to claim 4, It is characterized in that The module controller includes an internal working power supply circuit, controller uplink and downlink communication interfaces, IGCT device communication and drive circuit, two hard node fault alarm circuits and a temperature control switch alarm circuit, three DC voltage analog quantity acquisition circuits and a hard overvoltage detection circuit.
6. The cross-clamped IGCT power module according to claim 5, It is characterized in that The three DC voltage detection circuits simultaneously transmit their collected data in packages to the module controller through the uplink communication optical fiber. The module controller has the functions of automatic analog quantity screening and acquisition fault protection, and performs "three out of two" and "two out of one" anti-error design to avoid a single analog quantity failure causing the module controller to trigger protection.
7. The cross-clamped IGCT power module according to claim 6, It is characterized in that After the cross-clamped IGCT power module detects IGCT fault information, it will execute the IGCT pulse sealing instruction and send the fault information to the central controller. The central controller will trip the external interconnection line switch and the DC side switch to protect the equipment. The cross-clamped IGCT power module is connected in series in the half-bridge circuit topology. When a DC bipolar short circuit occurs, the central controller detects abnormal changes in external voltage and current, and quickly locks the half-bridge module and IGCT module. The cross-clamped IGCT power module realizes the clamping function and quickly isolates the fault current within microseconds.
8. The cross-clamped IGCT power module according to claim 7, It is characterized in that It also includes a heat sink and press-fit accessories, wherein the press-fit accessories include a cast steel pressure plate, a disc spring, a spring seat and a copper busbar. The heat sink includes a first aluminum plate heat sink, a second aluminum plate heat sink and a third aluminum plate heat sink. Disc springs and spring seats are respectively arranged on the inner sides of the cast steel pressure plate. The cathode of the IGCT device and the anode of the first fast recovery diode are directly pressed together after being inserted between the first aluminum plate heat sink. The anode of the IGCT device is pressed onto the first aluminum plate heat sink, and the cathode of the first fast recovery diode is pressed onto the second aluminum plate heat sink. The anode of the IGCT device and the cathode of the first fast recovery diode are short-circuited together with a copper busbar, and then the positive copper busbar is led out from the anode aluminum plate heat sink of the IGCT device, and the negative copper busbar is led out from the cathode aluminum plate heat sink of the IGCT device; the anode and cathode of the second fast recovery diode are pressed onto the third aluminum plate heat sink, and the positive copper busbar is led out from the third aluminum plate heat sink, and the negative copper busbar is led out from the cathode aluminum plate heat sink.