Soft switching logic control circuit and method, inverter and storage medium

Abstract

The invention discloses a soft switching logic control circuit and method, an inverter and a storage medium, and relates to the technical field of inverter control, the circuit comprises a control module, a first logic module, an isolation driving module and a power module, the first logic module comprises a first fault detection unit and a first logic processing unit; the control module generates a pulse control signal, the first fault detection unit performs fault detection on a plurality of external hardware circuits and outputs a plurality of corresponding first detection signals, and the first logic processing unit performs logic OR processing according to the plurality of first detection signals and outputs a soft switching control signal. And the isolation driving module drives the power module to work normally according to the pulse control signal, and stops receiving the pulse control signal when receiving the soft switching control signal so as to drive the power module to execute soft switching operation according to the soft switching control signal. According to the invention, the switching loss under the normal operation condition is reduced, and the working efficiency of the inverter is improved.

Description

Technical Field

[0001] The present application relates to the field of inverter control technology, and in particular to a soft switching logic control circuit, method, inverter and storage medium. Background Art

[0002] In the related art, when the inverter has a bus voltage overvoltage, load current overcurrent and other faults, and executes a safety protection action to enter a safe state, in order to make the voltage stress peak within a safe range, the drive control is achieved by adjusting the drive parameters of the power module. The problem with this method is that the large drive resistor required for fault protection is applied to all operating conditions such as normal operation, fault protection and safe startup, resulting in a situation where the application of large drive resistors covers all operating conditions, which will cause the output capacity of the controller to be insufficient under normal operating conditions and safe startup conditions, resulting in low working efficiency of the inverter. Summary of the invention

[0003] The main purpose of this application is to provide a soft switching logic control circuit, method, inverter and storage medium, aiming to solve the technical problems in the related art that when the inverter performs safety protection, there are insufficient controller output capacity and low inverter working efficiency.

[0004] To achieve the above objectives, the present application proposes a soft switching logic control circuit, comprising:

[0005] Power module;

[0006] A control module, used for generating and outputting a pulse control signal;

[0007] A first logic module includes a first fault detection unit and a first logic processing unit connected to each other, the first fault detection unit is used to perform fault detection on multiple external hardware circuits and output corresponding multiple first detection signals, and the first logic processing unit is used to perform logic or processing according to the multiple first detection signals and output a soft switch control signal;

[0008] The isolation driving module is connected to the control module and the first logic processing unit respectively, and is connected to the power module through multiple driving channels. The isolation driving module is used to receive a pulse control signal to drive the power module to work normally according to the pulse control signal, and to stop receiving the pulse control signal when receiving a soft switching control signal, so as to drive the power module to perform a soft switching operation according to the soft switching control signal.

[0009] In one embodiment, the isolation driving module includes:

[0010] A low-voltage logic unit is connected to the control module and the first logic processing unit respectively, and the low-voltage logic unit is used to perform priority judgment according to the received pulse control signal and the soft switch control signal, and if the soft switch control signal is at a low level, the first isolation drive signal is output according to the pulse control signal, and if the soft switch control signal is at a high level, the second isolation drive signal is output according to the soft switch control signal;

[0011] The high-voltage logic unit is connected to the low-voltage logic unit, and is internally provided with an on-logic circuit and a off-logic circuit. The on-logic circuit is connected to the power module through at least one soft-on driving resistor, and the off-logic circuit is connected to the power module through at least one soft-off driving resistor. The high-voltage logic unit is used to control the normal switching of the power module according to the first isolated driving signal, or to switch channels between multiple driving channels according to the second isolated driving signal, so as to control the power module to perform soft-on through the on-logic circuit or to control the power module to perform soft-off operation through the off-logic circuit.

[0012] In one embodiment, the control module includes:

[0013] A pulse control unit is connected to the low-voltage logic unit, and the pulse control unit is used to generate a pulse control signal according to a received instruction;

[0014] A fault external detection unit, used to detect faults in the external modules of the control module and output a fault external detection signal;

[0015] A fault self-checking unit is used to detect faults of internal components of the control module and output a fault self-checking signal;

[0016] The first logic processing unit is also connected to the external fault detection unit and the self-fault detection unit respectively. The first logic processing unit is also used to perform logic or processing according to multiple first detection signals, external fault detection signals and self-fault detection signals, and output a soft switch control signal.

[0017] In one embodiment, the isolation driving module further includes:

[0018] A low-voltage external detection unit is used to detect faults in the low-voltage side external module of the isolation drive module and output a low-voltage external detection signal;

[0019] A low-voltage self-test unit is used to perform fault detection on the internal components on the low-voltage side of the isolation drive module and output a low-voltage self-test signal;

[0020] The low-voltage logic unit is also connected to the low-voltage external detection unit and the low-voltage self-detection unit respectively. The low-voltage logic unit is also used to perform priority judgment based on the received pulse control signal, soft switch control signal, low-voltage external detection signal and low-voltage self-detection signal. If the soft switch control signal, the low-voltage external detection signal and the low-voltage self-detection signal are all low levels, the first isolation drive signal is output according to the pulse control signal. If the soft switch control signal, the low-voltage external detection signal or the low-voltage self-detection signal is high level, the second isolation drive signal is output accordingly.

[0021] In one embodiment, the soft switch logic control circuit further includes:

[0022] An isolation module, connected to the first logic processing unit and the high-voltage logic unit respectively, and used for isolating the soft switch control signal and transmitting it to the high-voltage logic unit;

[0023] The high-voltage logic unit is also used to switch channels between multiple drive channels according to the second isolation drive signal or the soft switch control signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

[0024] In one embodiment, the soft switch logic control circuit further includes:

[0025] A second logic module includes a second fault detection unit and a second logic processing unit connected to each other, the second logic processing unit is respectively connected to the isolation module and the second fault detection unit, the second fault detection unit is used to perform fault detection on the external hardware circuit on the high-voltage side and output a second detection signal, and the second logic processing unit is used to perform logic or processing according to the soft switch control signal and the second detection signal and output a soft switch drive signal;

[0026] The high-voltage logic unit is also connected to the second logic module. The high-voltage logic unit is also used to switch channels between multiple drive channels according to the second isolation drive signal or the soft switch drive signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

[0027] In one embodiment, the isolation driving module further includes:

[0028] A high-voltage external detection unit is used to detect faults in the high-voltage side external module of the isolation drive module and output a high-voltage external detection signal;

[0029] A high-voltage self-test unit is used to detect faults of internal components on the high-voltage side of the isolation drive module and output a high-voltage self-test signal;

[0030] The high-voltage logic unit is also connected to the high-voltage external detection unit and the high-voltage self-detection unit respectively. The high-voltage logic unit is also used to switch channels between multiple drive channels according to the second isolated drive signal, the high-voltage external detection signal or the high-voltage self-detection signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or control the power module to perform soft turn-off through the turn-off logic circuit.

[0031] In addition, to achieve the above purpose, the present application also proposes a soft switch logic control method, which is applied to the soft switch logic control circuit as described above. The soft switch logic control method includes:

[0032] Generate and output pulse control signals through a control module;

[0033] The pulse control signal is received through the isolation driving module to drive the power module to work normally according to the pulse control signal;

[0034] Performing fault detection on multiple external hardware circuits through a first fault detection unit, and outputting corresponding multiple first detection signals;

[0035] Performing logic OR processing according to the plurality of first detection signals by the first logic processing unit, and outputting a soft switch control signal;

[0036] When receiving the soft switch control signal, the isolation driving module stops receiving the pulse control signal, so as to drive the power module to perform the soft switch operation according to the soft switch control signal.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes an inverter, including the soft switching logic control circuit as mentioned above.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the soft switch logic control method as described above is implemented.

[0039] One or more technical solutions proposed in this application have at least the following technical effects:

[0040] A soft switch logic control circuit is proposed. A control module generates and outputs a pulse control signal. An isolation drive module receives the pulse control signal to drive a power module to work normally according to the pulse control signal. A first fault detection unit performs fault detection on multiple external hardware circuits and outputs corresponding multiple first detection signals. A first logic processing unit performs logic or processing according to the multiple first detection signals and outputs a soft switch control signal. When receiving the soft switch control signal, the isolation drive module stops receiving the pulse control signal to drive the power module to perform a soft switch operation according to the soft switch control signal. When a fault is detected and a safe state needs to be entered, the pulse control channel for driving and controlling the power module in the normal operation state is first closed and switched to the soft switch control channel. Specifically, the power module is soft-switched according to the soft switch control signal, so that the soft switch operation is decoupled from the normal operation condition. This can not only reduce the voltage stress of the power module when it enters the safe state under the fault protection condition, but also avoid the problem of insufficient output capacity of the control module when normal operation is restored later. This reduces the switching loss under the normal operation condition and improves the working efficiency of the inverter where the circuit is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of a driving circuit of a power module in the related art;

[0044] Figure 2 is another driving circuit schematic diagram of a power module in the related art;

[0045] Figure 3 A connection diagram of the first embodiment of the soft switch logic control circuit provided by the present application;

[0046] Figure 4 Another connection diagram of the first embodiment of the soft switching logic control circuit provided by the present application;

[0047] Figure 5 A connection diagram of the second embodiment of the soft switch logic control circuit provided by the present application;

[0048] Figure 6A connection diagram of a third embodiment of the soft switching logic control circuit provided by the present application;

[0049] Figure 7 A connection diagram of a fourth embodiment of the soft switching logic control circuit provided by the present application;

[0050] Figure 8 This is a connection diagram of the fifth embodiment of the soft switching logic control circuit provided in the present application.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0053] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0054] In the related art, when the inverter has a bus voltage overvoltage, load current overcurrent and other faults, it is generally hard-shutdown according to the received PWM (Pulse Width Modulation) wave for fault protection. However, in this method, the power module in the inverter is prone to excessive shutdown voltage stress spikes when performing hard shutdown according to the PWM wave, and it is also prone to excessive diode reverse recovery voltage stress spikes when performing active short circuit (ASC) and shutting down under a small on-resistance. Therefore, when the current inverter performs safety protection actions in a fault state to enter a safe state, there is a problem of excessive voltage stress spikes.

[0055] In order to keep the voltage stress peak within a safe range, the related art adjusts the driving parameters of the power module to ensure that the voltage stress does not exceed the standard. Figure 1 The figure shows a driving circuit of a power module in the related art, in which the isolated driving module outputs a PWM driving signal to the power module by opening or closing a channel to realize driving control. The problem with this method is that the large driving resistor required for fault protection is applied to all operating conditions such as normal operation, fault protection and safe startup, resulting in a situation where the application of large driving resistors covers all operating conditions, which will cause the output capacity of the controller to be insufficient under normal operating conditions and safe startup conditions, resulting in low working efficiency of the inverter.

[0056] In order to avoid the above problems, the related art has proposed a solution to reduce the voltage stress by switching to a driving resistor with a larger resistance. Figure 2Another driving circuit of the power module in the related art is shown, in which multiple opening channels and closing channels are arranged between the isolation driving module and the power module, and different channels are connected to driving resistors with different resistance values, and the isolation driving module performs driving resistor switching to switch the appropriate opening channel or closing channel to realize the driving control of the power module. The disadvantage of this method is that when the inverter performs a safe start, the driving channel switched in the fault protection condition will still be maintained, which will still cause the risk of excessive stress when the switch tube in the power module is turned on or off.

[0057] In response to the above problems, the present application proposes a soft switching logic control circuit, method, inverter and storage medium. The following is a detailed description of the embodiments of the present application and the following embodiments or implementation methods in conjunction with the accompanying drawings.

[0058] The present application embodiment provides a soft switch logic control circuit, referring to Figure 3 , Figure 3 This is a connection diagram of the first embodiment of the soft switch logic control circuit of the present application. In this embodiment, the soft switch logic control circuit includes a control module, a first logic module, an isolation drive module and a power module;

[0059] The first logic module includes a first fault detection unit and a first logic processing unit connected to each other, and the isolation drive module is connected to the control module and the first logic processing unit respectively, and is connected to the power module through a plurality of drive channels;

[0060] The control module is used to generate and output a pulse control signal;

[0061] The first fault detection unit is used to perform fault detection on multiple external hardware circuits and output corresponding multiple first detection signals;

[0062] The first logic processing unit is used for performing logic OR processing according to the plurality of first detection signals and outputting a soft switch control signal;

[0063] The isolation driving module is used to receive the pulse control signal to drive the power module to work normally according to the pulse control signal, and to stop receiving the pulse control signal when receiving the soft switching control signal to drive the power module to perform soft switching operation according to the soft switching control signal.

[0064] It should be noted that the soft switch logic control circuit can be set in the inverter to control the power module of the inverter in response to different working conditions, including driving control under all working conditions such as normal operation, fault protection and safe startup, and can drive the switch tube in the power module to turn on or off. The external hardware circuit can be other circuits in the inverter except the soft switch logic control circuit, which belong to the external circuit of the soft switch logic control circuit. The first fault detection unit can perform fault detection on these external circuits, including overcurrent, overvoltage, short circuit and other detections, as the gate circuit of the first logic processing unit. The power module has a switch tube, which can be a controllable switch tube such as a MOS tube (Metal-Oxide-SemiconductorField-Effect Transistor), a JFET tube (Junction Field-Effect Transistor), an IGBT tube (Insulated Gate Bipolar Transistor) or a power semiconductor switch (such as gallium nitride power semiconductors, silicon carbide power devices, etc.), which can be selected according to actual needs and is not specifically limited here.

[0065] It should also be noted that the isolation drive module can divide the soft switch logic control circuit into a low voltage side and a high voltage side, wherein the control module and the first logic module are both located on the low voltage side, and the power module is located on the high voltage side. The control end EN of the isolation drive module is connected to the output end of the control module to receive a pulse control signal; the first input end IN1 of the isolation drive module is connected to the output end of the first logic processing unit to receive a soft switch control signal, wherein the soft switch control signal can be output when a fault is determined to exist, or can be continuously output and converted to a high level when a fault is determined to exist, which can be selected according to actual needs.

[0066] In the isolation drive module, when only the pulse control signal is received, the power module can be driven to work normally. Specifically, the switch tube in the power module can be driven to turn on or off according to the different level states of the pulse control signal. At this time, the inverter is in normal operating conditions. Correspondingly, the control module and the isolation drive module constitute a pulse control channel to realize drive control of the power module under normal operating conditions; when the pulse control signal and the soft switch control signal are received, the pulse control signal can be stopped from being received to drive the power module to perform soft opening or soft closing according to the soft switch control signal. At this time, the inverter is in a fault protection condition. Correspondingly, the first fault detection unit, the first logic processing unit and the isolation drive module constitute a soft switch control channel to realize drive control of the power module to enter a safe state; when the pulse control signal and the soft switch control signal are received, the level states of the two signals can also be judged in combination with the priority. Specifically, the level state of the signal with a high priority can be judged according to the priority rule, and it is selected to enter the normal operating state or the safe state. In actual application, it can be selected according to needs, and no specific limitation is made here.

[0067] It can be understood that when the isolation drive module receives the soft switching control signal output by the first logic processing unit, it can be determined that soft switching control is required at this time and the inverter needs to enter a safe state. At this time, the isolation drive module stops receiving the pulse control signal, that is, the pulse control channel under the original normal operating condition is closed, and it is switched to the soft switching control channel and performs soft switching, so that there is an independent channel under the fault protection condition, and the corresponding independent application of a large-resistance drive resistor will not conflict with the normal operating condition, thereby avoiding the problem of insufficient output capacity and low efficiency of the control module caused by using a large drive resistor to cover all operating conditions in the related technology.

[0068] In a possible implementation, Figure 3 As shown, the control module may include a pulse control unit connected to the low-voltage logic unit, the pulse control unit is used to generate a pulse control signal (PWM) according to a received instruction, and send it to the low-voltage logic unit through the control terminal EN.

[0069] It should be noted that the instructions received by the pulse control unit can come from other modules or other circuits of the inverter, or from other devices outside the inverter, such as the main controller of the car where the inverter is located. The source of the instructions is not specifically limited here.

[0070] In a possible implementation, Figure 3 As shown, the isolation driving module may include a low voltage logic unit and a high voltage logic unit;

[0071] A low-voltage logic unit is connected to the control module and the first logic processing unit respectively, and the low-voltage logic unit is used to perform priority judgment according to the received pulse control signal and the soft switch control signal, and if the soft switch control signal is at a low level, the first isolation drive signal is output according to the pulse control signal, and if the soft switch control signal is at a high level, the second isolation drive signal is output according to the soft switch control signal;

[0072] The high-voltage logic unit is connected to the low-voltage logic unit, and is internally provided with an on-logic circuit and a off-logic circuit. The on-logic circuit is connected to the power module through at least one soft-on driving resistor, and the off-logic circuit is connected to the power module through at least one soft-off driving resistor. The high-voltage logic unit is used to control the normal switching of the power module according to the first isolated driving signal, or to switch channels between multiple driving channels according to the second isolated driving signal, so as to control the power module to perform soft-on through the on-logic circuit or to control the power module to perform soft-off operation through the off-logic circuit.

[0073] It should be noted that the low-voltage logic unit is located on the low-voltage side of the isolation drive module, connected to the pulse control unit in the control module through the control terminal EN, and connected to the first logic processing unit through the first input terminal IN1, so that the isolation drive module can receive the pulse control signal and the soft switch control signal. The high-voltage logic unit is located on the high-voltage side of the isolation drive module, and the low-voltage logic unit is isolated and connected to the high-voltage logic unit. Among them, the low-voltage logic unit performs logic processing on the low-voltage side based on the level state of the pulse control signal and the soft switch control signal, and the high-voltage logic unit switches channels between multiple drive channels based on the output of the low-voltage logic unit to reduce the voltage stress of the power module performing the switching action.

[0074] In the low-voltage logic unit, the isolation drive module can make a judgment according to the priority, first judge the level state of the soft switch control signal with a higher priority, and then judge the level state of the pulse control signal. If the soft switch control signal is at a low level, the switch tube in the power module can be driven to turn on or off according to the different level states of the pulse control signal. For example, when the soft switch control signal is at a low level and the pulse control signal is high, the switch tube in the power module is driven to turn on, and when the soft switch control signal is at a low level and the pulse control signal is low, the switch tube in the power module is driven to turn off; if the soft switch control signal is at a high level, the switch tube in the power module can be driven to turn off directly according to the high-level soft switch control signal, so that the power module enters a safe state and performs a safe soft shutdown, or the switch tube in the power module is driven to turn on directly according to the high-level soft switch control signal, so that the power module enters a safe state and performs a safe soft opening. In actual applications, whether to perform soft opening or soft closing when the soft switch control signal is at a high level can be selected according to needs. When the soft switch control signal is at a high level, the low-voltage logic unit may first stop receiving the pulse control signal and only receive the soft switch control signal to switch from the pulse control channel to the soft switch control channel. Afterwards, in response to the received pulse control signal, the isolation drive signal is output to the high-voltage logic unit, so that the high-voltage logic unit drives the switch tube in the power module to turn off according to the isolation drive signal, so that the power module enters a safe state and executes a safe soft shutdown, or directly drives the switch tube in the power module to turn on according to the high-level soft switch control signal, so that the power module enters a safe state and executes a safe soft start-up. In actual applications, it can be selected according to needs and is not specifically limited here.

[0075] In the high-voltage logic unit, the turn-on logic circuit, a soft-on driving resistor Ron and the power module constitute a driving channel, and correspondingly, the turn-off logic circuit, a soft-off driving resistor Roff and the power module also constitute a driving channel, thereby realizing channel switching between multiple driving channels. It should be noted that multiple driving channels can have different performances. When switching channels, you can first choose to connect the turn-on logic circuit, and then choose to connect the specific soft-on driving resistor Ron, or first choose to connect the turn-off logic circuit, and then choose to connect the specific soft-off driving resistor Roff. For example, when at least one soft-on drive resistor Ron between the turn-on logic circuit and the power module includes multiple resistors, the different drive channels where these soft-on drive resistors Ron are located are multiple turn-on drive channels with different performances, such as voltage turn-on drive channels with different impedances or current turn-on drive channels with different currents; for another example, when at least one soft-off drive resistor Roff between the turn-off logic circuit and the power module includes multiple resistors, the different drive channels where these soft-off drive resistors Roff are located are multiple turn-off drive channels with different performances, such as turn-off resistance channels with different impedances, voltage turn-off channels with different impedances, current turn-off channels with different currents, or negative pressure turn-off channels with different negative voltages. In addition, the switching method in the high-voltage logic unit can be to switch to a driving resistor with a larger resistance in sequence according to the resistance value and the number of cycles. For example, if a fault is found in the first cycle and it is necessary to enter a safe state, the normal driving channel is switched to a driving channel with a larger resistance value. If the fault still exists at this time, it can continue to switch to a driving channel with a larger resistance value. In this way, it can switch to a soft open / soft close channel with a larger switching channel impedance, other two-level soft open / soft close channels, soft open / soft close channels with a lower voltage value, soft open / soft close channels with a weaker driving current, etc., which are distinguished from the driving channels under normal operating conditions and the driving channels under fault protection conditions are enabled.

[0076] The soft switch logic control circuit provided in the present embodiment generates and outputs a pulse control signal through a control module, and the isolation drive module receives the pulse control signal to drive the power module to work normally according to the pulse control signal. The first fault detection unit also performs fault detection on multiple external hardware circuits and outputs corresponding multiple first detection signals. The first logic processing unit performs logic or processing according to the multiple first detection signals and outputs a soft switch control signal. When receiving the soft switch control signal, the isolation drive module stops receiving the pulse control signal to drive the power module to perform a soft switch operation according to the soft switch control signal. When a fault is detected and it is necessary to enter a safe state, the pulse control channel for driving and controlling the power module in the normal operation state is first closed and switched to the soft switch control channel. Specifically, the power module is soft-switched according to the soft switch control signal, so that the soft switch operation is decoupled from the normal operation condition. This can not only reduce the voltage stress of the power module when it enters the safe state under the fault protection condition, but also avoid the problem of insufficient output capacity of the control module when normal operation is restored later, thereby reducing the switching loss under normal operation conditions and improving the working efficiency of the inverter where the circuit is located.

[0077] In one possible implementation, refer to Figure 4 , Figure 4 is another connection diagram of the soft switch logic control circuit in this embodiment, the control module may include a pulse control unit, an external fault detection unit and a self-fault detection unit, the pulse control unit is connected to the low-voltage logic unit, and the first logic processing unit is also connected to the external fault detection unit and the self-fault detection unit respectively;

[0078] The pulse control unit is used to generate a pulse control signal according to the received instruction;

[0079] The external fault detection unit is used to detect faults in the external modules of the control module and output external fault detection signals;

[0080] The fault self-checking unit is used to detect faults of internal components of the control module and output fault self-checking signals;

[0081] The first logic processing unit is further used to perform logic or processing according to the plurality of first detection signals, the external fault detection signal and the self-fault detection signal, and output a soft switch control signal.

[0082] It should be noted that the external module of the control module can be other modules other than the control module located on the low-voltage side of the soft switch logic control circuit, or other modules connected to the control module in other circuits outside the soft switch logic control circuit, which are not specifically limited here; the internal device of the control module can be a controller in the control module or a peripheral device of the controller, which are not specifically limited here. The external fault detection unit can send a fault external detection signal to the first logic processing unit after detecting that there is a fault in the external module, and the self-fault detection unit can also send a fault self-detection signal to the first logic processing unit after detecting that there is a fault in the internal device of the control module. The first logic processing unit performs a logical judgment on the three received signals. When any one of the three signals or one of the three signals is received at a high level, it can be considered that fault protection is required, and then a soft switch control signal is output to the isolation drive module, so that the isolation drive module stops receiving the pulse control signal, so as to drive the power module to perform a soft switching operation according to the soft switch control signal.

[0083] It can be understood that the external fault detection unit and the self-fault detection unit are arranged in the control module, and the external fault detection unit, the first logic processing unit and the isolation drive module constitute a soft switch control channel, and the self-fault detection unit, the first logic processing unit and the isolation drive module also constitute a soft switch control channel. Combined with the soft switch control channel composed of the aforementioned first fault detection unit, the first logic processing unit and the isolation drive module, this implementation mode has three soft switch control channels. When switching from normal operating conditions to fault protection conditions, the control channel on the low-voltage side is also switched from the pulse control channel to any one of the three soft switch control channels; for the high-voltage side, the high-voltage logic unit in the isolation drive module can select the switching drive channel according to actual needs, which will not be repeated here.

[0084] In this implementation, an external fault detection unit and a self-fault detection unit provided in the control module are utilized to perform fault detection on the modules on the low-voltage side of the circuit and the control module itself, and corresponding fault protection is performed. Specifically, the soft switch drive control of the power module is performed to put the inverter into a safe state, and more control channels are provided on the low-voltage side to meet more practical needs.

[0085] Based on the first embodiment of the soft switch logic control circuit of the present application, in the second embodiment of the soft switch logic control circuit of the present application, the same or similar contents as those in the above embodiment can be referred to the above introduction, and will not be repeated in the following. Figure 5 , Figure 5 This is a connection diagram of the second embodiment of the soft switch logic control circuit of the present application. The isolation drive module may further include a low-voltage external detection unit and a low-voltage self-detection unit. The low-voltage logic unit is further connected to the low-voltage external detection unit and the low-voltage self-detection unit respectively.

[0086] The low-voltage external detection unit is used to detect faults of the low-voltage side external module of the isolation drive module and output a low-voltage external detection signal;

[0087] The low-voltage self-test unit is used to detect faults of internal components on the low-voltage side of the isolation drive module and output a low-voltage self-test signal;

[0088] The low-voltage logic unit is also used to perform priority judgment based on the received pulse control signal, soft switch control signal, low-voltage external detection signal and low-voltage self-detection signal. If the soft switch control signal, the low-voltage external detection signal and the low-voltage self-detection signal are all low levels, the first isolation drive signal is output according to the pulse control signal; if the soft switch control signal, the low-voltage external detection signal or the low-voltage self-detection signal is high level, the second isolation drive signal is output accordingly.

[0089] It should be noted that the low-voltage side external module of the isolation drive module can be other modules other than the isolation drive module located on the low-voltage side in the soft switch logic control circuit, or other modules in other circuits outside the soft switch logic control circuit that are connected to the low-voltage side device of the isolation drive module, which is not specifically limited here. The low-voltage external detection unit can send a low-voltage external detection signal to the low-voltage logic unit after detecting that there is a fault in the low-voltage side external module, and the low-voltage self-detection unit can send a low-voltage self-detection signal to the low-voltage logic unit after detecting that there is a fault in the low-voltage side internal device. The low-voltage logic unit performs a logical judgment on the three received signals. When any one of the three signals or one of the three signals is at a high level, it can be considered that fault protection is required, and then stop receiving the pulse control signal to generate a second isolation drive signal, and output the second isolation drive signal to the high-voltage logic unit, so that the high-voltage logic unit switches channels between multiple drive channels according to the second isolation drive signal. The details will not be repeated.

[0090] In this implementation, a low-voltage external detection unit and a low-voltage self-detection unit added inside the isolation drive module are used to perform fault detection on the external module of the isolation drive module and the isolation drive module itself, and corresponding fault protection is performed to put the inverter into a safe state. This can cope with the situation where the isolation drive module fails. The module is not limited to only receiving external input control signals, and can also cope with faults itself.

[0091] Based on the above embodiment, in the third embodiment of the soft switch logic control circuit of the present application, the same or similar contents as the above embodiment can be referred to the above introduction, and will not be repeated in the following. Figure 6 , Figure 6 This is a connection diagram of the third embodiment of the soft switch logic control circuit of the present application. The soft switch logic control circuit may further include:

[0092] An isolation module, connected to the first logic processing unit and the high-voltage logic unit respectively, and used for isolating the soft switch control signal and transmitting it to the high-voltage logic unit;

[0093] The high-voltage logic unit is also used to switch channels between multiple drive channels according to the second isolation drive signal or the soft switch control signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

[0094] It should be noted that the isolation module is independent of the isolation drive module and can be implemented using a conventional isolator. The isolation module can directly transmit the soft switch control signal output by the first logic processing unit to the isolation drive module; the high-voltage side of the isolation drive module is provided with a second input terminal IN2, and the high-voltage logic unit in the isolation drive module is connected to the output terminal of the isolation module through the second input terminal IN2 to receive the isolated soft switch control signal. Then, when the high-voltage logic unit receives any one of the second isolation drive signal and the soft switch control signal, it switches channels between multiple drive channels, and the details are not repeated here.

[0095] In this implementation, the isolation module directly transmits the soft switch control signal to the high-voltage logic unit on the high-voltage side of the isolation drive module, and does not need to pass through the low-voltage logic unit on the low-voltage side for logic processing. Compared with the method of passing through the low-voltage logic unit, the transmission speed is faster, which facilitates the high-voltage logic unit to switch the drive channel as soon as possible, thereby entering the fault protection condition as soon as possible, allowing the inverter to enter a safe state as soon as possible.

[0096] Based on the above embodiments, in the fourth embodiment of the soft switch logic control circuit of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 7 , Figure 7 This is a connection diagram of the fourth embodiment of the soft switch logic control circuit of the present application. The soft switch logic control circuit may further include a second logic module, wherein the second logic module includes a second fault detection unit and a second logic processing unit connected to each other, the second logic processing unit is respectively connected to the isolation module and the second fault detection unit, and the high-voltage logic unit is also connected to the second logic module;

[0097] The second fault detection unit is used to perform fault detection on the external hardware circuit on the high-voltage side and output a second detection signal;

[0098] The second logic processing unit is used for performing logic OR processing according to the soft switch control signal and the second detection signal, and outputting a soft switch driving signal;

[0099] The high voltage logic unit is also used to switch channels between multiple drive channels according to the second isolation drive signal or the soft switch drive signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

[0100] It should be noted that the first logic module can perform fault detection on the external hardware circuit on the low-voltage side, and the second logic module can perform fault detection on the external hardware circuit on the high-voltage side, including overcurrent, overvoltage, short circuit and other detections, as a gate circuit of the second logic processing unit. The second logic processing unit can receive the soft switch control signal transmitted by the isolation module, and can also receive the second detection signal output by the second fault detection unit when a fault is detected, and perform logic or processing, that is, as long as any one of the two signals is received or any one of the two signals is at a high level, a soft switch drive signal can be generated accordingly and input into the high-voltage logic unit, so that it switches channels between multiple drive channels, and the details will not be repeated.

[0101] In this implementation, the external hardware circuits on the low-voltage side and the high-voltage side of the soft switch logic control circuit can be respectively subjected to fault detection, and the corresponding detection methods can make the detection methods of the respective fault detection units more concise and less error-prone.

[0102] Based on the above embodiments, in the fourth embodiment of the soft switch logic control circuit of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 8 , Figure 8 This is a connection diagram of the fifth embodiment of the soft switch logic control circuit of the present application. The isolation drive module may further include a high-voltage external detection unit and a high-voltage self-detection unit. The high-voltage logic unit is connected to the high-voltage external detection unit and the high-voltage self-detection unit respectively.

[0103] The high-voltage external detection unit is used to detect faults in the high-voltage side external module of the isolation drive module and output a high-voltage external detection signal;

[0104] The high-voltage self-test unit is used to perform fault detection on the internal components on the high-voltage side of the isolation drive module and output a high-voltage self-test signal;

[0105] The high-voltage logic unit is also used to switch channels between multiple drive channels according to the second isolated drive signal, the high-voltage external detection signal or the high-voltage self-detection signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

[0106] It should be noted that the high-voltage side external module of the isolation drive module can be other modules located on the high-voltage side in the soft switch logic control circuit except the isolation drive module, or other modules connected to the high-voltage side devices of the isolation drive module in other circuits outside the soft switch logic control circuit, which are not specifically limited here. The high-voltage external detection unit can send a high-voltage external detection signal to the high-voltage logic unit after detecting that there is a fault in the high-voltage side external module, and the high-voltage self-detection unit can send a high-voltage self-detection signal to the high-voltage logic unit after detecting that there is a fault in the high-voltage side internal device. The high-voltage logic unit performs logical judgment on the received multi-channel signals. When any one of the multi-channel signals is received or one of the signals is at a high level, it can be considered that fault protection is required, and then channel switching is performed between multiple drive channels. The details will not be repeated.

[0107] In this implementation, a high-voltage external detection unit and a high-voltage self-detection unit added inside the isolation drive module are used to perform fault detection on the external module of the isolation drive module and the isolation drive module itself, and corresponding fault protection is performed to put the inverter into a safe state. This can cope with the situation where a high-voltage side fault occurs in the isolation drive module. The module is not limited to receiving only external input control signals, nor is it required to pass through the low-voltage side, so that the isolation drive module itself can also cope with faults, providing more fault protection paths.

[0108] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the soft switch logic control circuit of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0109] The present application also provides a soft switch logic control method, which is applied to the soft switch logic control circuit of any of the above embodiments. The soft switch logic control method may include steps S1 to S5:

[0110] Step S1, generating and outputting a pulse control signal through a control module;

[0111] Step S2, receiving the pulse control signal through the isolation driving module to drive the power module to work normally according to the pulse control signal;

[0112] Step S3, performing fault detection on multiple external hardware circuits through a first fault detection unit, and outputting corresponding multiple first detection signals;

[0113] Step S4, performing logic OR processing according to the plurality of first detection signals by the first logic processing unit, and outputting a soft switch control signal;

[0114] Step S5, when receiving the soft switching control signal, the isolation driving module stops receiving the pulse control signal, so as to drive the power module to perform the soft switching operation according to the soft switching control signal.

[0115] The soft switch logic control method provided by the present application is applied to the soft switch logic control circuit in the above embodiment, and can solve the technical problems of insufficient controller output capacity and low inverter working efficiency when the inverter performs safety protection in the related art. Compared with the related art, the beneficial effects of the soft switch logic control method provided by the present application are the same as the beneficial effects of the soft switch logic control circuit provided by the above embodiment, and the other technical features in the soft switch logic control method are the same as the features disclosed in the soft switch logic control circuit in the above embodiment, which will not be repeated here.

[0116] The present application also provides an inverter, which includes a soft switching logic control circuit as described in any of the above embodiments.

[0117] Optionally, the inverter may also include at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the soft switching logic control method in the above embodiment.

[0118] The inverter provided by the present application adopts the soft switch logic control circuit in the above embodiment, which can solve the technical problems of insufficient controller output capacity and low inverter working efficiency when the inverter performs safety protection in the related art. Compared with the related art, the beneficial effects of the inverter provided by the present application are the same as the beneficial effects of the soft switch logic control circuit provided by the above embodiment, and other technical features in the inverter are the same as the features disclosed by the soft switch logic control circuit in the above embodiment, which will not be repeated here.

[0119] The present application also provides a computer-readable storage medium having computer-readable program instructions (ie, computer program) stored thereon, the computer-readable program instructions being used to execute the soft switch logic control method in the above-mentioned embodiment.

[0120] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: a portable computer disk, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, etc., or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system or device, or a combination of the two. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0121] The computer-readable storage medium may be included in the inverter, or may exist independently without being installed in the inverter. The computer-readable storage medium carries one or more programs, and when the one or more programs are executed, the functions defined in the soft switch logic control circuit disclosed in the embodiment of the present application can be realized.

[0122] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or to an external computer, such as an Internet connection provided by an Internet service provider.

[0123] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0124] The storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned soft switch logic control method, and can solve the technical problems of insufficient controller output capacity and low inverter working efficiency when the inverter performs safety protection in the related art. Compared with the related art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the soft switch logic control circuit provided in the above-mentioned embodiment, and will not be repeated here.

[0125] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A soft switching logic control circuit, characterized in that: include: Power module; A control module, used for generating and outputting a pulse control signal; a first logic module, comprising a first fault detection unit and a first logic processing unit connected to each other, wherein the first fault detection unit is used to perform fault detection on multiple external hardware circuits and output corresponding multiple first detection signals, and the first logic processing unit is used to perform logic OR processing according to the multiple first detection signals and output a soft switch control signal; An isolation driving module is respectively connected to the control module and the first logic processing unit, and is connected to the power module through multiple driving channels. The isolation driving module is used to receive the pulse control signal to drive the power module to work normally according to the pulse control signal, and is used to stop receiving the pulse control signal when receiving the soft switching control signal, so as to drive the power module to perform a soft switching operation according to the soft switching control signal.

2. The soft switching logic control circuit according to claim 1, characterized in that: The isolation driving module comprises: a low-voltage logic unit, connected to the control module and the first logic processing unit, respectively, and configured to perform priority judgment according to the received pulse control signal and the soft switch control signal, and output a first isolation drive signal according to the pulse control signal if the soft switch control signal is at a low level, and output a second isolation drive signal according to the soft switch control signal if the soft switch control signal is at a high level; A high-voltage logic unit is connected to the low-voltage logic unit, and is internally provided with an on-logic circuit and a off-logic circuit. The on-logic circuit is connected to the power module through at least one soft-on driving resistor, and the off-logic circuit is connected to the power module through at least one soft-off driving resistor. The high-voltage logic unit is used to control the normal switching of the power module according to the first isolated driving signal, or to switch channels between the multiple driving channels according to the second isolated driving signal, so as to control the power module to perform soft on-state through the on-logic circuit or to perform soft off-state through the off-logic circuit.

3. The soft switching logic control circuit according to claim 2, characterized in that: The control module comprises: A pulse control unit connected to the low-voltage logic unit, the pulse control unit is used to generate the pulse control signal according to the received instruction; A fault external detection unit, used for performing fault detection on an external module of the control module and outputting a fault external detection signal; A fault self-detection unit, used to detect faults of internal components of the control module and output a fault self-detection signal; The first logic processing unit is also connected to the external fault detection unit and the self-fault detection unit respectively. The first logic processing unit is also used to perform logic or processing according to multiple first detection signals, the external fault detection signals and the self-fault detection signals, and output the soft switch control signal.

4. The soft switching logic control circuit according to claim 2, characterized in that: The isolation driving module also includes: A low-voltage external detection unit, used to perform fault detection on a low-voltage side external module of the isolation drive module and output a low-voltage external detection signal; A low-voltage self-test unit, used to perform fault detection on internal components on the low-voltage side of the isolation drive module and output a low-voltage self-test signal; The low-voltage logic unit is also connected to the low-voltage external detection unit and the low-voltage self-detection unit respectively. The low-voltage logic unit is also used to perform priority judgment based on the received pulse control signal, the soft switch control signal, the low-voltage external detection signal and the low-voltage self-detection signal. If the soft switch control signal, the low-voltage external detection signal and the low-voltage self-detection signal are all low levels, the first isolation drive signal is output according to the pulse control signal. If the soft switch control signal, the low-voltage external detection signal or the low-voltage self-detection signal is high, the second isolation drive signal is output accordingly.

5. The soft switching logic control circuit according to claim 2, characterized in that: The soft switch logic control circuit also includes: an isolation module, connected to the first logic processing unit and the high-voltage logic unit respectively, and configured to isolate and transmit the soft switch control signal to the high-voltage logic unit; The high-voltage logic unit is also used to switch channels between the multiple drive channels according to the second isolation drive signal or the soft switch control signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

6. The soft switching logic control circuit according to claim 5, characterized in that: The soft switch logic control circuit also includes: A second logic module includes a second fault detection unit and a second logic processing unit connected to each other, the second logic processing unit is respectively connected to the isolation module and the second fault detection unit, the second fault detection unit is used to perform fault detection on the external hardware circuit on the high-voltage side and output a second detection signal, and the second logic processing unit is used to perform logic or processing according to the soft switch control signal and the second detection signal and output a soft switch drive signal; The high-voltage logic unit is also connected to the second logic module, and is further used to switch channels between the multiple drive channels according to the second isolation drive signal or the soft switch drive signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or to control the power module to perform soft turn-off through the turn-off logic circuit.

7. The soft switching logic control circuit according to claim 2, characterized in that: The isolation driving module also includes: A high-voltage external detection unit, used to perform fault detection on a high-voltage side external module of the isolation drive module and output a high-voltage external detection signal; A high-voltage self-test unit, used to perform fault detection on internal components on the high-voltage side of the isolation drive module and output a high-voltage self-test signal; The high-voltage logic unit is also connected to the high-voltage external detection unit and the high-voltage self-detection unit, respectively. The high-voltage logic unit is also used to switch channels between the multiple drive channels according to the second isolated drive signal, the high-voltage external detection signal or the high-voltage self-detection signal, so as to control the power module to perform soft turn-on through the turn-on logic circuit or control the power module to perform soft turn-off operation through the turn-off logic circuit.

8. A soft switch logic control method, characterized in that: Applied to the soft switch logic control circuit according to any one of claims 1 to 7, the soft switch logic control method comprises: Generate and output pulse control signals through a control module; The pulse control signal is received by the isolation driving module to drive the power module to work normally according to the pulse control signal; Performing fault detection on multiple external hardware circuits through a first fault detection unit, and outputting corresponding multiple first detection signals; Performing logic OR processing according to the first detection signals by a first logic processing unit, and outputting a soft switch control signal; When the soft switching control signal is received by the isolation driving module, the pulse control signal is stopped to drive the power module to perform a soft switching operation according to the soft switching control signal.

9. An inverter, characterized in that: The inverter comprises: A soft switching logic control circuit as claimed in any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the soft switch logic control method according to claim 8 is implemented.

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