Drive circuit, drive signal generation method, and power conversion device

Abstract

Embodiments of the present application disclose a driving circuit, a driving signal generation method and a power conversion device. The driving circuit comprises an electrical parameter limit signal processing module and a driving signal output module. The electrical parameter limit signal processing module is configured to receive an initial driving signal and an electrical parameter limit signal, adjust a change direction of the electrical parameter limit signal according to the initial driving signal, and generate a control signal. The driving signal output module is configured to generate a driving output signal according to the initial driving signal and the control signal. In the driving output signal, a pulse with a width less than a threshold value is shielded.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of integrated circuits, in particular to a driving circuit, a driving signal generation method and a power conversion device. BACKGROUND

[0002] The power conversion device can realize the conversion of the form of electric energy and the control of power, thereby improving the utilization efficiency of electric energy and reducing energy loss. The power conversion device can include inverters, rectifiers and choppers, etc., which constitute the core part of the power electronic system and are responsible for converting the electric energy provided by the power supply into the form of electric energy suitable for the load.

[0003] In the power conversion device, the inverter circuit or the rectifier circuit contains controllable switching tubes. The state (i.e. opening or closing) of the switching tube is controlled by the driving signal and the electrical parameter limiting signal. However, the driving signal and the electrical parameter limiting signal can be mismatched, which can cause the state of the switching tube to be abnormal, thereby affecting the normal operation of the circuit. SUMMARY

[0004] Therefore, the embodiments of the present application provide a driving circuit, a driving signal generation method and a power conversion device, which can avoid the abnormality of the switching tube and ensure the normal operation of the circuit.

[0005] The technical scheme of the embodiments of the present application is implemented as follows:

[0006] The driving circuit provided by the embodiments of the present application comprises: an electrical parameter limiting signal processing module configured to receive an initial driving signal and an electrical parameter limiting signal, adjust the change edge of the electrical parameter limiting signal according to the initial driving signal, and generate a control signal; wherein the electrical parameter limiting signal jumps according to the comparison result of the electrical parameter and the reference value; and a driving signal output module electrically connected to the electrical parameter limiting signal processing module and configured to generate a driving output signal according to the initial driving signal and the control signal; wherein the pulse with a width less than a threshold value in the driving output signal is shielded.

[0007] In some embodiments, the electrical parameter limiting signal processing module comprises: a first adjusting module electrically connected to the driving signal output module and configured to adjust the first change edge of the electrical parameter limiting signal according to the change edge of the initial driving signal, and generate the first change edge of the control signal.

[0008] In some embodiments, the electric parameter limiting signal processing module further comprises: a second adjusting module electrically connected to the driving signal output module and configured to generate a second change edge of the control signal according to a second change edge of the electric parameter limiting signal; a third adjusting module electrically connected to the driving signal output module and configured to maintain a level of the control signal; and a driving module electrically connected to the second adjusting module and the third adjusting module and configured to drive the electric parameter limiting signal.

[0009] In some embodiments, the first adjusting module comprises: an inverter, an input end of the inverter receiving the initial driving signal; a first AND gate, a first input end of the first AND gate electrically connected to an output end of the inverter, and a second input end of the first AND gate receiving the electric parameter limiting signal; and a first diode, an anode of the first diode electrically connected to an output end of the first AND gate, and a cathode of the first diode electrically connected to an input end of the driving signal output module.

[0010] In some embodiments, the second adjusting module comprises: a second diode, an anode of the second diode electrically connected to an input end of the driving signal output module, and a cathode of the second diode electrically connected to an output end of the driving module.

[0011] In some embodiments, the third adjusting module comprises: a second resistor, a first end of the second resistor electrically connected to an output end of the driving module, and a second end of the second resistor electrically connected to an input end of the driving signal output module; and a capacitor, a first end of the capacitor electrically connected to the second end of the second resistor, and a second end of the capacitor grounded.

[0012] In some embodiments, the driving module comprises: a second AND gate, input ends of the second AND gate receiving the electric parameter limiting signal, and an output end of the second AND gate serving as an output end of the driving module.

[0013] In some embodiments, the driving signal output module comprises: a third AND gate, a first input end of the third AND gate receiving the initial driving signal, and a second input end of the third AND gate receiving the control signal; and a third resistor, a first end of the third resistor electrically connected to an output end of the third AND gate.

[0014] Embodiments of the present application also provide a driving signal generation method, comprising: receiving an initial driving signal and an electric parameter limiting signal; wherein the electric parameter limiting signal jumps according to a comparison result of an electric parameter and a reference value; adjusting a change edge of the electric parameter limiting signal according to the initial driving signal to generate a control signal; and generating a driving output signal according to the initial driving signal and the control signal; wherein a pulse with a width less than a threshold value in the driving output signal is shielded.

[0015] The embodiment of the present application further provides a power conversion device, comprising the driving circuit.

[0016] It can be understood that, in the embodiment of the present application, the variation direction of the electrical parameter limiting signal is adjusted according to the initial driving signal to generate the control signal, and then the driving output signal is generated according to the initial driving signal and the control signal. In this way, the pulse with a width less than the threshold (i.e. the pulse with a very small duty cycle) caused by the mismatch between the initial driving signal and the electrical parameter limiting signal is shielded, so that the abnormality of the switch tube is avoided and the normal operation of the circuit is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a signal waveform diagram of the driving circuit in the related art;

[0018] Figure 2 FIG. 2 is a structure diagram of the driving circuit provided by the embodiment of the present application; Figure 1 ;

[0019] Figure 3 FIG. 3 is a structure diagram of the driving circuit provided by the embodiment of the present application; Figure 2 ;

[0020] Figure 4 FIG. 4 is a structure diagram of the driving circuit provided by the embodiment of the present application; Figure 3 ;

[0021] Figure 5 FIG. 5 is a signal waveform diagram of the driving circuit provided by the embodiment of the present application;

[0022] Figure 6 FIG. 6 is an implementation flow diagram of the driving signal generation method provided by the embodiment of the present application;

[0023] Figure 7 FIG. 7 is a structure diagram of the power conversion device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is further described in detail below in combination with the drawings and embodiments, and the described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by the person skilled in the art without making creative efforts fall within the protection scope of the present application.

[0025] In the following description, "some embodiments" are referred to, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict. The terms "first / second / third" referred to are only to distinguish similar objects, and do not represent a specific order of the objects. Understandably, "first / second / third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing the present application only and is not intended to be limiting of the present application.

[0027] In the related art, only simple logic processing is performed on the drive signal and the electrical parameter limiting signal, and then the drive signal and the electrical parameter limiting signal are transmitted to the switch tube. For example, referring to Figure 1 , the drive signal DR1 and the electrical parameter limiting signal DR1_Limit are subjected to logical AND operation to obtain the drive output signal DR1_Out_ex, and then the drive output signal DR1_Out_ex is transmitted to the switch tube to control the state of the switch tube.

[0028] Continuing to refer to Figure 1 , since the electrical parameter limiting signal DR1_Limit jumps according to the comparison result of the hardware electrical parameter (current or voltage) and the reference value, and the drive signal DR1 is not affected by the hardware electrical parameter, the drive signal DR1 and the electrical parameter limiting signal DR1_Limit can be mismatched, and then the drive output signal DR1_Out_ex can have a pulse with a very small duty cycle. The pulse with a very small duty cycle cannot completely turn on or turn off the switch tube due to the very small width, and instead causes fluctuations in the current or voltage, thereby affecting the normal operation of the circuit.

[0029] Figure 2 is an optional structure diagram of the drive circuit provided by the embodiments of the present application. As shown in Figure 2 , the drive circuit includes an electrical parameter limiting signal processing module 10 and a drive signal output module 20.

[0030] The electrical parameter limiting signal processing module 10 is configured to receive an initial drive signal DR1 and an electrical parameter limiting signal DR1_Limit, adjust the change edge of the electrical parameter limiting signal DR1_Limit according to the initial drive signal DR1, and generate a control signal DR1_Ctrl.

[0031] The driving signal output module 20 is electrically connected to the electric parameter limiting signal processing module 10. The driving signal output module 20 is configured to generate a driving output signal DR1_Out according to the initial driving signal DR1 and the control signal DR1_Ctrl.

[0032] In the embodiment, the pulse with a width less than the threshold value is shielded in the driving output signal DR1_Out. That is, referring to Figure 5 , the pulse with a very small duty cycle does not appear in the driving output signal DR1_Out, so that the normal operation of the switch tube can be ensured.

[0033] In the embodiment, the initial driving signal DR1 can be a PWM wave (pulse width modulation waveform) sent by a DSP (digital signal processing chip). The electric parameter limiting signal DR1_Limit can be generated by an electric parameter limiting circuit. Specifically, the electric parameter limiting circuit can compare the electric parameter with a reference value by a comparator, and output a corresponding level according to the comparison result.

[0034] In the embodiment, the electric parameter limiting signal DR1_Limit jumps according to the comparison result of the electric parameter and the reference value. The electric parameter can be the current or voltage of hardware, that is, the electric parameter limiting signal DR1_Limit can be a current limiting signal or a voltage limiting signal. For example, in the short circuit detection, if the current is greater than the current reference value, the electric parameter limiting signal DR1_Limit jumps once until the current returns to the range of the current reference value, and then the electric parameter limiting signal DR1_Limit jumps again. For another example, in the short circuit detection, if the voltage is less than the voltage reference value, the electric parameter limiting signal DR1_Limit jumps once until the voltage returns to the range of the voltage reference value, and then the electric parameter limiting signal DR1_Limit jumps again.

[0035] It should be noted that the jump of the electric parameter limiting signal DR1_Limit means that the electric parameter limiting signal DR1_Limit jumps from one level to another. For example, the electric parameter limiting signal DR1_Limit jumps from a low level to a high level, or the electric parameter limiting signal DR1_Limit jumps from a high level to a low level.

[0036] It can be understood that, in the embodiments of the present application, the variation edge of the electrical parameter limiting signal DR1_Limit is adjusted according to the initial driving signal DR1, to generate the control signal DR1_Ctrl, and then the driving output signal DR1_Out is generated according to the initial driving signal DR1 and the control signal DR1_Ctrl. In this way, the pulse with a width less than the threshold (i.e., the pulse with a very small duty cycle) generated due to the mismatch between the initial driving signal DR1 and the electrical parameter limiting signal DR1_Limit is shielded, so that the abnormality of the switch tube is avoided, and the normal operation of the circuit is ensured.

[0037] It should be noted that the embodiments of the present application are described with the high level of the electrical signal as valid. Specifically, referring to Figure 5 , the high level pulse in the driving output signal DR1_Out is used to turn on the switch tube. The driving output signal DR1_Out is obtained according to the initial driving signal DR1 and the electrical parameter limiting signal DR1_Limit. When the electrical parameter is within the range of the reference value, the electrical parameter limiting signal DR1_Limit maintains the high level, at this time, the level of the driving output signal DR1_Out is determined based on the level of the initial driving signal DR1, and the pulse in the initial driving signal DR1 will correspond to generate the pulse in the driving output signal DR1_Out; on the other hand, when the electrical parameter is out of the range of the reference value, for example, the current is greater than the current reference value, the electrical parameter limiting signal DR1_Limit jumps from the high level to the low level, at this time, the level of the driving output signal DR1_Out also jumps to the low level, and the pulse in the driving output signal DR1_Out is no longer generated, that is, the driving of the switch tube is blocked.

[0038] Correspondingly, in the embodiments of the present application, the circuit design can also be performed according to the low level of the electrical signal as valid. On the basis of the embodiments of the present application, the transformation and adjustment of the circuit according to the low level of the electrical signal as valid should also be considered as covered within the protection scope of the present application.

[0039] In some embodiments of the present application, as Figure 3 shown, the electrical parameter limiting signal processing module 10 includes a first adjustment module 101. The first adjustment module 101 is electrically connected to the driving signal output module 20. The first adjustment module 101 is configured to adjust the first variation edge of the electrical parameter limiting signal DR1_Limit according to the variation edge of the initial driving signal DR1, to generate the first variation edge of the control signal DR1_Ctrl.

[0040] Referring to Figure 5, the rising edge (i.e., the first change edge) of the electrical parameter limiting signal DR1_Limit is earlier than the falling edge of the initial driving signal DR1; and further, the small displacement between the rising edge of the electrical parameter limiting signal DR1_Limit and the falling edge of the initial driving signal DR1 is the cause of the extremely small duty cycle pulse in the related art.

[0041] In combination with Figure 3 and Figure 5 , in the embodiments of the present application, after the adjustment of the first adjustment module 101, the rising edge (i.e., the first change edge) of the control signal DR1_Ctrl is aligned with the falling edge of the initial driving signal DR1, so that the extremely small duty cycle pulse in the driving output signal DR1_Out can be avoided.

[0042] In some embodiments of the present application, as shown in Figure 3 , the electrical parameter limiting signal processing module 10 further includes a second adjustment module 102, a third adjustment module 103 and a driving module 104.

[0043] In the embodiments of the present application, the second adjustment module 102 is electrically connected to the driving signal output module 20 and is configured to generate a second change edge of the control signal DR1_Ctrl according to a second change edge of the electrical parameter limiting signal DR1_Limit.

[0044] In combination with Figure 3 and Figure 5 , the falling edge (i.e., the second change edge) of the control signal DR1_Ctrl is aligned with the falling edge (i.e., the second change edge) of the electrical parameter limiting signal DR1_Limit. In this way, when the electrical parameter is outside the reference value range, the level of the control signal DR1_Ctrl can jump in time, so as to ensure that the electrical parameter limiting signal DR1_Limit can effectively control the switch tube.

[0045] In the embodiments of the present application, the third adjustment module 103 is electrically connected to the driving signal output module 20 and is configured to maintain the level of the control signal DR1_Ctrl.

[0046] In combination with Figure 3 and Figure 5 , after the control signal DR1_Ctrl jumps from the low level to the high level, the high level state of the control signal DR1_Ctrl can be consistent with the high level state of the electrical parameter limiting signal DR1_Limit, that is, the control signal DR1_Ctrl can be maintained at the high level.

[0047] In the embodiments of the present application, the driving module 104 is electrically connected to the second adjusting module 102 and the third adjusting module 103, and is configured to drive the electrical parameter limit signal DR1_Limit. That is, the second adjusting module 102 and the third adjusting module 103 receive the electrical parameter limit signal DR1_Limit after being driven. The driving module 104 does not change the waveform of the electrical parameter limit signal DR1_Limit, that is, Figure 5 the waveform of the electrical parameter limit signal DR1_Limit before being driven and the waveform of the electrical parameter limit signal DR1_Limit after being driven. Figure 5

[0048] It can be understood that, on the one hand, the rising edge of the electrical parameter limit signal DR1_Limit is adjusted according to the falling edge of the initial driving signal DR1, so that the rising edge of the driving output signal DR1_Ctrl is aligned with the falling edge of the initial driving signal DR1, so that a pulse with a very small duty cycle in the driving output signal DR1_Out can be avoided, and abnormality of the switching tube can be avoided. On the other hand, the falling edge of the control signal DR1_Ctrl is aligned with the falling edge of the electrical parameter limit signal DR1_Limit, and the high level state of the control signal DR1_Ctrl is consistent with the high level state of the electrical parameter limit signal DR1_Limit, so that the electrical parameter limit signal DR1_Limit can play a timely and effective control role.

[0049] In some embodiments of the present application, as shown in Figure 4 the first adjusting module 101 includes an inverter Inv, a first AND gate And1 and a first diode D1. The input end of the inverter Inv receives the initial driving signal DR1. The first input end of the first AND gate And1 is electrically connected to the output end of the inverter Inv, and the second input end of the first AND gate And1 receives the electrical parameter limit signal DR1_Limit. The anode of the first diode D1 is electrically connected to the output end of the first AND gate And1, and the cathode of the first diode D1 is electrically connected to the input end of the driving signal output module 20. The cathode of the first diode D1 is electrically connected to the input end of the driving signal output module 20 for receiving the control signal DR1_Ctrl.

[0050] In the embodiments of the present application, in combination with Figure 4 and Figure 5 the initial driving signal DR1 is logically ANDed with the electrical parameter limit signal DR1_Limit after passing through the inverter Inv, and the waveform at the output end of the first AND gate And1 is as shown in Figure 5 ​As shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting.

[0051] In some embodiments of the present application, as shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting. Figure 4

[0052] In some embodiments of the present application, as shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting. Figure 4

[0053] In some embodiments of the present application, as shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting. Figure 4 Figure 5 In some embodiments of the present application, as shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting.

[0054] In some embodiments of the present application, as shown in FIG. 6, the first adjusting module 101 further includes a first resistor R1. The first resistor R1 is electrically connected between the cathode of the first diode D1 and the input end of the driving signal output module 20. The first resistor R1 can avoid overlarge voltage or current in the first adjusting module 101, and plays a role of voltage division and current limiting. Figure 4

[0055] ​​​​In the embodiments of the present application, in combination with Figure 4 and Figure 5 , the second resistor R2 and the capacitor C form a charging circuit, which can charge the input end of the driving signal output module 20 after the electrical parameter limiting signal DR1_Limit recovers to the high level. Since the charging of the capacitor C is delayed, the charging circuit will not pull up the level at the moment when the electrical parameter limiting signal DR1_Limit recovers to the high level, but slowly pull up the level, so that the rising edge of the control signal DR1_Ctrl is not aligned with the rising edge of the electrical parameter limiting signal DR1_Limit. At the same time, in the case that the electrical parameter limiting signal DR1_Limit maintains the high level, the charging circuit continues to charge, so that the control signal DR1_Ctrl can also maintain the high level.

[0056] In some embodiments of the present application, as shown in Figure 4 , the driving module 104 includes a second AND gate And2. The input ends of the second AND gate And2 receive the electrical parameter limiting signal DR1_Limit, and the output end of the second AND gate And2 serves as the output end of the driving module 104.

[0057] In some embodiments of the present application, as shown in Figure 4 , the driving signal output module 20 includes a third AND gate And3 and a third resistor R3. The first input end of the third AND gate And3 receives the initial driving signal DR1, and the second input end of the third AND gate And3 receives the control signal DR1_Ctrl. The first end of the third resistor R3 is electrically connected to the output end of the third AND gate And3.

[0058] In the embodiments of the present application, in combination with Figure 4 and Figure 5 , the initial driving signal DR1 and the control signal DR1_Ctrl are subjected to logical AND operation to obtain the driving output signal DR1_Out. In this way, only when the initial driving signal DR1 and the electrical parameter limiting signal DR1_Limit are both high level, the driving output signal DR1_Out with high level can be output. On the other hand, if the electrical parameter exceeds the reference value, the electrical parameter limiting signal DR1_Limit jumps to the low level, and then the driving output signal DR1_Out also jumps to the low level, at this time, the driving of the switch tube is blocked, and the switch tube cannot be turned on.

[0059] It can be understood that, on one hand, the rising edge of the control signal DR1_Ctrl is aligned with the falling edge of the initial driving signal DR1, so that a pulse with a very small duty cycle is avoided in the driving output signal DR1_Out. On the other hand, the falling edge of the control signal DR1_Ctrl is aligned with the falling edge of the electrical parameter limiting signal DR1_Limit, and the high level state of the control signal DR1_Ctrl is consistent with the high level state of the electrical parameter limiting signal DR1_Limit, so that the electrical parameter limiting signal DR1_Limit can effectively control the switch tube.

[0060] The embodiment of the present application further provides a driving signal generation method, which is applied to a power conversion device, such as Figure 6 As shown in the figure, the method comprises steps S101-S103.

[0061] S101, receiving an initial driving signal and an electrical parameter limiting signal; wherein the electrical parameter limiting signal is toggled according to a comparison result of an electrical parameter and a reference value.

[0062] S102, adjusting a change edge of the electrical parameter limiting signal according to the initial driving signal, and generating a control signal.

[0063] S103, generating a driving output signal according to the initial driving signal and the control signal; wherein a pulse with a width less than a threshold value in the driving output signal is shielded.

[0064] In some embodiments of the present application, the step S102 can be implemented by steps S1021-S1022. Figure 6 The step S102 shown in the figure will be described in combination with the steps.

[0065] S1021, adjusting a first change edge of the electrical parameter limiting signal according to a change edge of the initial driving signal, and generating a first change edge of the control signal.

[0066] S1022, generating a second change edge of the control signal according to a second change edge of the electrical parameter limiting signal.

[0067] Figure 7 A structural schematic diagram of a power conversion device provided by the embodiment of the present application is shown in the figure. Figure 7 As shown in the figure, the power conversion device 800 comprises a driving circuit 810. The driving circuit 810 comprises the structure in the foregoing embodiment.

[0068] It should be understood that every feature, structure, or characteristic described in relation to one embodiment is applicable to at least one other embodiment. Therefore, the appearance of the phrase "in one embodiment" or "in an embodiment" in various places throughout the specification is not necessarily referring to the same embodiment. Furthermore, various features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that the sequence of steps / processes in various embodiments of the present application does not mean the order of execution, the execution order of the steps / processes should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above sequence number of the embodiments of the present application is only for description, not representing the pros and cons of the embodiments.

[0069] It should be noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0070] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed components can be through some interface, indirect coupling or communication connection between devices or units, which can be electrical, mechanical or other forms.

[0071] The units described above as separate components can or can not be physically separate, and the components shown as units can or can not be physical units; they can be located in one place or distributed on multiple network units; some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0072] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or hardware plus software functional unit.

[0073] The above merely provides the implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the change or replacement within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A drive circuit characterized by comprising: include: An electrical parameter limiting signal processing module is configured to receive an initial drive signal and an electrical parameter limiting signal, and adjust the changing edge of the electrical parameter limiting signal according to the initial drive signal to generate a control signal; wherein the electrical parameter limiting signal changes according to the comparison result of the electrical parameter and a reference value. The drive signal output module, electrically connected to the electrical parameter limiting signal processing module, is configured to generate a drive output signal based on the initial drive signal and the control signal; wherein, in the drive output signal, pulses with a width less than a threshold are shielded.

2. The drive circuit according to claim 1, characterized by The electrical parameter limiting signal processing module includes: The first adjustment module, electrically connected to the drive signal output module, is configured to adjust the first changing edge of the electrical parameter limit signal according to the changing edge of the initial drive signal, and generate the first changing edge of the control signal.

3. The drive circuit according to claim 2, characterized in that, The electrical parameter limiting signal processing module further includes: The second adjustment module is electrically connected to the drive signal output module and is configured to generate the second edge of the control signal according to the second edge of the electrical parameter limiting signal. The third adjustment module, electrically connected to the drive signal output module, is configured to maintain the level of the control signal; The drive module, electrically connected to the second adjustment module and the third adjustment module, is configured to drive the electrical parameter limiting signal.

4. The drive circuit according to claim 2, characterized by The first adjustment module includes: An inverter, the input of which receives the initial drive signal; A first AND gate, the first input of the first AND gate is electrically connected to the output of the inverter, and the second input of the first AND gate receives the electrical parameter limiting signal; The first diode has its anode electrically connected to the output terminal of the first AND gate, and its cathode electrically connected to the input terminal of the drive signal output module.

5. The drive circuit according to claim 3, characterized by The second adjustment module includes: The second diode has its anode electrically connected to the input terminal of the drive signal output module, and its cathode electrically connected to the output terminal of the drive module.

6. The drive circuit according to claim 3, characterized by The third adjustment module includes: The second resistor has its first end electrically connected to the output terminal of the drive module and its second end electrically connected to the input terminal of the drive signal output module. A capacitor, wherein the first terminal of the capacitor is electrically connected to the second terminal of the second resistor, and the second terminal of the capacitor is grounded.

7. The drive circuit according to claim 3, characterized by The driving module includes: The second AND gate receives the electrical parameter limiting signal at its input terminals, and its output terminal serves as the output terminal of the driving module.

8. The drive circuit of claim 1, wherein, The drive signal output module includes: A third AND gate, wherein the first input terminal of the third AND gate receives the initial drive signal, and the second input terminal of the third AND gate receives the control signal; The third resistor has its first end electrically connected to the output of the third AND gate.

9. A drive signal generation method characterized by, include: Receive an initial drive signal and an electrical parameter limit signal; wherein the electrical parameter limit signal changes according to the comparison result of the electrical parameter and the reference value; Based on the initial drive signal, the change edge of the electrical parameter limit signal is adjusted to generate a control signal; According to the initial drive signal and the control signal, a drive output signal is generated; wherein in the drive output signal, a pulse with a width less than a threshold value is shielded.

10. A power conversion device, characterized by, Comprising: The drive circuit of any one of claims 1 to 8.

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