Frequency converter driving device and system

Abstract

The utility model discloses a frequency converter driving device and system, and the driving device comprises a driving module, a control module, and a voltage stabilization module. The driving output end of the driving module is connected to the driving input end of the control module, and the output end of the control module is connected to the input end of the voltage stabilizing module; when the pulse signal end of the driving module is in a high level state, the on-off state of the driving module is a cut-off state; when the pulse signal end of the driving module is in a low-level state and the input end of the driving module is in a high-level state, the on-off state of the driving module is a conducting state; the voltage input end of the control module is externally connected with an external power supply, and the on-off state of the driving module is the same as the on-off state of the control module. The driving device can improve the driving stability of the frequency converter and reduce the risk that the frequency converter is damaged. The frequency converter can be widely applied to the technical field of frequency converters.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a frequency converter driving device and a system. Background Art

[0002] The frequency converter is a device that converts the industrial frequency power supply (50Hz / 60Hz) into alternating power supplies of various frequencies to achieve variable speed operation of the motor. The normal operation of the frequency converter requires the participation of the inverter circuit and the brake circuit.

[0003] At present, the traditional inverter driving method is usually based on electronic devices such as optocouplers to form a driving circuit, and the inverter is driven by the driving circuit. This driving method has low driving stability, and when the driving circuit fails or is damaged, the inverter is easily damaged.

[0004] Therefore, the problems existing in the prior art still need to be solved and optimized. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problems existing in the related technologies to a certain extent.

[0006] To this end, an object of an embodiment of the utility model is to provide a frequency converter driving device, which can improve the stability of the frequency converter drive and reduce the risk of damage to the frequency converter.

[0007] In order to achieve the above technical objectives, in a first aspect, an embodiment of the utility model provides a frequency converter driving device, including: a driving module, a control module and a voltage stabilizing module;

[0008] The driving output end of the driving module is connected to the driving input end of the control module, and the output end of the control module is connected to the input end of the voltage stabilizing module;

[0009] When the pulse signal end of the driving module is in a high level state, the on-off state of the driving module is an off state; when the pulse signal end of the driving module is in a low level state and the input end of the driving module is in a high level state, the on-off state of the driving module is an on state;

[0010] The voltage input terminal of the control module is externally connected to an external power supply, and the on-off state of the drive module is the same as the on-off state of the control module.

[0011] In addition, a frequency converter drive device according to an embodiment of the utility model may also have the following additional technical features:

[0012] Optionally, in one embodiment of the utility model, the driving module includes a driving switch circuit and an optical coupler driving circuit;

[0013] The input end of the driving switch circuit serves as the input end of the driving module, and the output end of the driving switch circuit is connected to the primary input end of the optocoupler driving circuit;

[0014] The primary output end of the optocoupler driving circuit serves as the pulse signal end of the driving module, and the secondary end of the optocoupler driving circuit is connected to the driving input end of the control module.

[0015] Optionally, in an embodiment of the present utility model, the driving switch circuit includes a first resistor, a first diode and a first transistor;

[0016] The input end of the first resistor serves as the input end of the driving module, and the output end of the first resistor is connected to the input end of the first diode;

[0017] The output end of the first diode is connected to the base of the first transistor, and the collector of the first transistor is connected to the primary input end of the optocoupler driving circuit.

[0018] Optionally, in an embodiment of the present utility model, the driving switch circuit further includes a first capacitor, a second capacitor and a second resistor;

[0019] A first end of the first capacitor is grounded, and a second end of the first capacitor is connected to the emitter of the first transistor;

[0020] A first end of the second capacitor is connected to the emitter of the first transistor, and a second end of the second capacitor is connected to the base of the first transistor;

[0021] A first end of the second resistor is connected to a first end of the second capacitor, and a second end of the second resistor is connected to a second end of the second capacitor.

[0022] Optionally, in one embodiment of the present utility model, the optical coupling driving circuit includes a photoelectric coupler, a third resistor and a fourth resistor;

[0023] The primary input end of the photoelectric coupler is connected to the output end of the driving switch circuit, and the primary output end of the photoelectric coupler serves as the pulse signal end of the driving module;

[0024] The secondary side output terminal of the photoelectric coupler is connected to the first end of the third resistor, and the second end of the third resistor is connected to the driving input terminal of the control module;

[0025] The first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the secondary input end of the photoelectric coupler.

[0026] Optionally, in one embodiment of the present utility model, the photoelectric coupler includes a TLP785 chip;

[0027] The first pin of the TLP785 chip is connected to the output end of the driving switch circuit, and the second pin of the TLP785 chip serves as the pulse signal end of the driving module;

[0028] The third pin of the TLP785 chip is connected to the first end of the third resistor, and the fourth pin of the TLP785 chip is connected to the second end of the fourth resistor.

[0029] Optionally, in one embodiment of the present utility model, the control module includes a first switch circuit and a second switch circuit;

[0030] A first end of the first switch circuit is connected to a driving output end of the driving module, and a second end of the first switch circuit is connected to a first end of the second switch circuit;

[0031] The second end of the second switch circuit is connected to the input end of the voltage stabilizing module.

[0032] Optionally, in an embodiment of the present utility model, the first switch circuit includes a second transistor, and the second switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor and a third transistor;

[0033] The base of the second transistor is connected to the driving output terminal of the driving module, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the first end of the fifth resistor;

[0034] The second end of the fifth resistor is connected to the emitter of the third transistor, the first end of the sixth resistor is connected to the first end of the fifth resistor, and the second end of the sixth resistor is connected to the base of the third transistor;

[0035] The collector of the third transistor is connected to the input end of the voltage stabilizing module, the collector of the third transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

[0036] Optionally, in one embodiment of the utility model, the voltage stabilizing module includes a second diode and a third capacitor;

[0037] A first end of the third capacitor is connected to the output end of the control module, and a second end of the third capacitor is grounded;

[0038] An input end of the second diode is connected to the second end of the third capacitor, and an output end of the second diode is connected to the first end of the third capacitor.

[0039] On the other hand, an embodiment of the utility model provides a frequency converter drive system, comprising: a frequency converter and the frequency converter drive device described above, wherein the frequency converter is connected to a voltage stabilizing module in the frequency converter drive device.

[0040] The advantages and beneficial effects of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention:

[0041] The embodiment of the present application discloses a frequency converter drive device and system, wherein the drive device includes a drive module, a control module and a voltage stabilizing module; the drive output end of the drive module is connected to the drive input end of the control module, and the output end of the control module is connected to the input end of the voltage stabilizing module; when the pulse signal end of the drive module is in a high level state, the on-off state of the drive module is an off state; when the pulse signal end of the drive module is in a low level state and the input end of the drive module is in a high level state, the on-off state of the drive module is an on state; the voltage input end of the control module is externally connected to an external power supply, and the on-off state of the drive module is the same as the on-off state of the control module. When the pulse signal end of the drive module is in a high level state, the drive module is cut off, which can effectively reduce the situation where the external power supply voltage is still output to the frequency converter when the drive module is damaged, and effectively reduce the risk of damage to the frequency converter; in addition, the drive device also maintains the stability of the output voltage through the voltage stabilizing module, which can improve the stability of the frequency converter drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0043] Figure 1 A schematic diagram of a frequency converter drive device provided in accordance with an embodiment of the present utility model;

[0044] Figure 2 A circuit schematic diagram of a driving switch circuit provided for one embodiment of the utility model;

[0045] Figure 3 A circuit schematic diagram of an optocoupler drive circuit provided in one embodiment of the utility model;

[0046] Figure 4 A circuit schematic diagram of a control module provided for one embodiment of the utility model;

[0047] Figure 5 A circuit schematic diagram of a voltage stabilizing module provided for one embodiment of the utility model. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] In the description of the present utility model, it is necessary to understand that the terms "length", "upper", "lower", "front", "back", "left", "right", "top", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0050] The inverter needs the participation of the inverter circuit and the brake circuit when it is operating normally. The components of the inverter circuit and the brake circuit are similar and are usually integrated into an IGBT module. For a three-phase inverter bridge (i.e., inverter circuit), it has three bridge arms, each of which is composed of two upper and lower power switching devices. These two power switching devices will be damaged when they are turned on at the same time.

[0051] At present, the traditional inverter driving method is usually based on a drive circuit composed of electronic devices such as optocouplers, and the inverter is driven by the drive circuit, which specifically controls the on / off state of each power switch device in the three-phase inverter bridge (i.e., inverter circuit) and the on / off state of each power switch device in the brake circuit. The driving stability of this method is not high, and when the drive circuit fails or is damaged, the inverter is easily damaged.

[0052] Specifically, the drive circuit is generally controlled by a photocoupler, and the traditional drive circuit usually connects the external power supply directly to the photocoupler. When the photocoupler is normal, when the primary side of the photocoupler receives the enable signal with the correct timing, the primary side of the photocoupler will send out a light signal, so that the secondary side of the photocoupler is turned on, and the external power supply outputs a voltage signal with the correct timing to the inverter through the photocoupler and related auxiliary circuits. When the photocoupler is abnormal, since the external power supply is directly connected to the photocoupler, the external power supply may continuously output a voltage signal to the inverter. Under the mutual influence of other drive circuits, it is easy to cause the power switch devices in the inverter to be turned on at the same time, and the inverter is easily damaged. In addition, when the photocoupler is normal, the voltage signal output by the external power supply to the inverter is prone to fluctuations, making the stability of the inverter drive low.

[0053] In view of this, an inverter drive device and system are provided in the embodiment of the utility model application, wherein the drive device can effectively reduce the situation where the voltage signal is still output to the inverter when the drive module is damaged, reduce the phenomenon of simultaneous conduction of the inverter power switching devices, and reduce the risk of damage to the inverter; in addition, the drive device also maintains the stability of the voltage signal through the voltage stabilizing module, which can improve the stability of the inverter drive.

[0054] Reference Figure 1 Specifically, a frequency converter driving device in an embodiment of the present application includes: a driving module, a control module and a voltage stabilizing module;

[0055] The driving output end of the driving module is connected to the driving input end of the control module, and the output end of the control module is connected to the input end of the voltage stabilizing module;

[0056] When the pulse signal end of the driving module is in a high level state, the on-off state of the driving module is an off state; when the pulse signal end of the driving module is in a low level state and the input end of the driving module is in a high level state, the on-off state of the driving module is an on state;

[0057] The voltage input terminal of the control module is externally connected to an external power supply, and the on-off state of the drive module is the same as the on-off state of the control module.

[0058] In an embodiment of the present application, the driving module is used to switch the on and off state of the control module, the control module is used to receive an external power supply and transmit the voltage signal input by the external power supply to the voltage stabilizing module, the voltage stabilizing module is used to keep the voltage signal stable and transmit the voltage signal to the inverter.

[0059] It can be understood that the driving module in the embodiment of the present application may include two ports, namely, a pulse signal terminal and a driving output terminal, wherein the pulse signal terminal of the driving module is used to receive a pulse signal and control the on / off state of the driving module according to the received pulse signal. The driving output terminal of the driving module is used to provide a driving signal to the control module in the on state so that the control module is in the on state; and in the off state, not provide a driving signal to the control module so that the control module is in the off state.

[0060] Exemplarily, the working principle of a frequency converter drive device provided in an embodiment of the present application is:

[0061] The voltage input terminal of the control module is connected to an external power supply. When the input terminal of the drive module receives a high-level signal, the input terminal of the drive module is in a high-level state. When the pulse signal received by the pulse signal terminal of the drive module is in a low-level state, the drive module is turned on. The drive module provides a drive signal to the control module through the drive output terminal, so that the control module is also in a turned-on state. The control module transmits the received voltage signal to the inverter through the voltage stabilizing module.

[0062] The voltage input terminal of the control module is connected to an external power supply. When the pulse signal terminal of the drive module is in a high level state, that is, the pulse signal received by the pulse signal terminal of the drive module is in a high level state, the drive module is in a cut-off state and the control module is also in a cut-off state.

[0063] It should be noted that the on-off state of the drive module and the control module in the embodiment of the present application is the same, that is, when the drive module is in the off state, the control module is also in the off state; when the drive module is in the on state, the control module is also in the on state. When the drive module fails and is damaged, since the external power supply is connected to the voltage input terminal of the control module, it can effectively reduce the situation where the external power supply voltage is still output to the inverter when the drive module is damaged, and effectively reduce the risk of damage to the inverter.

[0064] In some embodiments, the driving module includes a driving switch circuit and an optocoupler driving circuit;

[0065] The input end of the driving switch circuit serves as the input end of the driving module, and the output end of the driving switch circuit is connected to the primary input end of the optocoupler driving circuit;

[0066] The primary output end of the optocoupler driving circuit serves as the pulse signal end of the driving module, and the secondary end of the optocoupler driving circuit is connected to the driving input end of the control module.

[0067] In an embodiment of the present application, the driving switch circuit is externally connected to an enable terminal, and the enable terminal is used to provide an enable signal. The level state of the input terminal of the driving switch circuit can control the on-off state of the driving switch circuit. When the input terminal of the driving switch circuit receives a high-level signal, the input terminal of the driving switch circuit is in a high-level state. At this time, the enable signal can be transmitted along the driving switch circuit to the primary input terminal of the optocoupler driving circuit.

[0068] It can be understood that when the primary input end of the optocoupler drive circuit is in a high level state, the primary output end of the optocoupler drive circuit is in a low level state, the primary side of the photocoupler in the optocoupler drive circuit sends a light signal, the secondary side of the optocoupler drive circuit is turned on, and the drive signal is generated and transmitted to the control module. When the input end of the drive switch circuit receives a low level signal, the input end of the drive switch circuit is in a low level state, the drive switch circuit is turned off, and the optocoupler drive circuit and the control module are both turned off.

[0069] Reference Figure 2 , in some embodiments, the driving switch circuit includes a first resistor R3, a first diode D1 and a first transistor Q1;

[0070] The input end of the first resistor serves as the input end of the driving module, and the output end of the first resistor is connected to the input end of the first diode;

[0071] The output end of the first diode is connected to the base of the first transistor, and the collector of the first transistor is connected to the primary input end of the optocoupler driving circuit.

[0072] In an embodiment of the present application, the emitter of the first transistor is externally connected to an enable signal. When the input end of the first resistor receives a high-level signal, the magnitude relationship between the high-level signal and the enable signal satisfies the transistor conduction condition. The high-level signal is transmitted to the base of the first transistor via the first diode, the first transistor is turned on, and the enable signal is transmitted to the primary input end of the optocoupler drive circuit via the first transistor.

[0073] It can be understood that when the input end of the first resistor receives a low-level signal, the magnitude relationship between the low-level signal and the enable signal satisfies the transistor conduction condition, the first transistor is cut off, and the enable signal cannot be transmitted to the primary input end of the optocoupler drive circuit through the first transistor, so that the optocoupler drive circuit is also cut off.

[0074] Continue to refer to Figure 2 , in some embodiments, the driving switch circuit further includes a first capacitor C1, a second capacitor C2 and a second resistor R1;

[0075] A first end of the first capacitor is grounded, and a second end of the first capacitor is connected to the emitter of the first transistor;

[0076] A first end of the second capacitor is connected to the emitter of the first transistor, and a second end of the second capacitor is connected to the base of the first transistor;

[0077] A first end of the second resistor is connected to a first end of the second capacitor, and a second end of the second resistor is connected to a second end of the second capacitor.

[0078] In the embodiment of the present application, the first capacitor is grounded, and the second capacitor and the second resistor connected in parallel play a filtering role to reduce noise and interference, so as to improve the stability and reliability of the driving switch circuit.

[0079] Reference Figure 3 , in some embodiments, the optical coupler driving circuit includes a photocoupler U1, a third resistor R5 and a fourth resistor R6;

[0080] The primary input end of the photoelectric coupler is connected to the output end of the driving switch circuit, and the primary output end of the photoelectric coupler serves as the pulse signal end of the driving module;

[0081] The secondary side output terminal of the photoelectric coupler is connected to the first end of the third resistor, and the second end of the third resistor is connected to the driving input terminal of the control module;

[0082] The first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the secondary input end of the photoelectric coupler.

[0083] In an embodiment of the present application, when the primary input end of the photoelectric coupler receives an enable signal and the primary output end of the photoelectric coupler receives a pulse signal in a high-level state, the primary side of the photoelectric coupler is turned on, and the primary side of the photoelectric coupler emits a light signal, so that the secondary side of the photoelectric coupler is turned on, generating a current (i.e., a drive signal) that is transmitted to the control module through the secondary output end to the second end of the third resistor.

[0084] It can be understood that the resistance values ​​of the third resistor and the fourth resistor can be set according to actual conditions so that when the driving module is in the on state, the current generated by the photocoupler can drive the control module to be in the on state; and the second end of the third resistor is used as the driving output end of the driving module.

[0085] It should be noted that when the pulse signal end of the driving module is in a high level state, that is, the on-off state of the driving module is in the off state, the photoelectric coupler is not conducting, and the input voltage of the secondary side of the photoelectric coupler will be pulled down to GND along the fourth resistor, thereby making the control module also in the off state.

[0086] Continue to refer to Figure 3, in some embodiments, the optocoupler comprises a TLP785 chip;

[0087] The first pin of the TLP785 chip is connected to the output end of the driving switch circuit, and the second pin of the TLP785 chip serves as the pulse signal end of the driving module;

[0088] The third pin of the TLP785 chip is connected to the first end of the third resistor, and the fourth pin of the TLP785 chip is connected to the second end of the fourth resistor.

[0089] In the embodiment of the present application, the first pin of the TLP785 chip is used as the primary input terminal of the photocoupler to receive the enable signal; the second pin of the TLP785 chip is used as the primary output terminal of the photocoupler, that is, the pulse signal terminal of the driving model. The third pin of the TLP785 chip is used as the secondary output terminal of the photocoupler; the fourth pin of the TLP785 chip is used as the secondary input terminal of the photocoupler.

[0090] It can be understood that the TLP785 chip belongs to a transistor optocoupler, and transistor optocouplers also include TLP521, TLP503, TLP181, MCT2E, PC817, etc., which can be simply replaced and will not be described in detail in this application.

[0091] In some embodiments, the control module includes a first switch circuit and a second switch circuit;

[0092] A first end of the first switch circuit is connected to a driving output end of the driving module, and a second end of the first switch circuit is connected to a first end of the second switch circuit;

[0093] The second end of the second switch circuit is connected to the input end of the voltage stabilizing module.

[0094] In an embodiment of the present application, the first end of the first switching circuit is connected to the driving output end of the driving module, and specifically can be connected to the second end of the third resistor and the second end of the fourth resistor; the driving signal provided by the driving module is used to switch the on-off state of the first switching circuit, and the first switching circuit is used to switch the on-off state of the second switching circuit.

[0095] Specifically, when the first end of the first switch circuit receives a driving signal, the first switch circuit is in the on state; at this time, the first switch circuit switches the on-off state of the second switch circuit to the on state, and the external power supply connected to the second switch circuit transmits a voltage signal to the voltage stabilizing module through the second switch circuit; when the first end of the first switch circuit receives a driving signal, the first switch circuit and the second switch circuit are both in the off state.

[0096] Reference Figure 4 , in some embodiments, the first switch circuit includes a second transistor Q3, and the second switch circuit includes a fifth resistor R2, a sixth resistor R4, a seventh resistor R7 and a third transistor Q2;

[0097] The base of the second transistor is connected to the driving output terminal of the driving module, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the first end of the fifth resistor;

[0098] The second end of the fifth resistor is connected to the emitter of the third transistor, the first end of the sixth resistor is connected to the first end of the fifth resistor, and the second end of the sixth resistor is connected to the base of the third transistor;

[0099] The collector of the third transistor is connected to the input end of the voltage stabilizing module, the collector of the third transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

[0100] In the embodiment of the present application, when the driving signal provided by the driving module causes the second transistor to be saturated and turned on, based on the reasonable voltage division of the fifth resistor and the sixth resistor, the on-off state of the third transistor can be synchronized with the on-off state of the second transistor, that is, when the second transistor is saturated and turned on, based on the fifth resistor and the sixth resistor, the third transistor is also saturated and turned on; when the second transistor is turned off, the third transistor is also turned off.

[0101] It can be understood that when the third transistor is turned off, the output voltage of the collector of the third transistor will be pulled down to GND along the seventh resistor, so that the power switch device of the subsequent inverter can be closed normally.

[0102] Reference Figure 5 , in some embodiments, the voltage stabilizing module includes a second diode D2 and a third capacitor C3;

[0103] A first end of the third capacitor is connected to the output end of the control module, and a second end of the third capacitor is grounded;

[0104] An input end of the second diode is connected to the second end of the third capacitor, and an output end of the second diode is connected to the first end of the third capacitor.

[0105] In the embodiment of the present application, the third capacitor can effectively reduce the misleading phenomenon of the inverter power switch device, and the second transistor is used to maintain the stability of the output voltage when the inverter power switch device is turned on.

[0106] Specifically, an inverter drive system provided in an embodiment of the present application includes: an inverter and the inverter drive device described above, wherein the inverter is connected to a voltage stabilizing module in the inverter drive device.

[0107] In an embodiment of the present application, the inverter can be connected to at least one inverter drive device. While realizing power supply frequency conversion through the inverter drive device in the embodiment of the present application, the situation where the inverter power switching devices are turned on at the same time can be reduced, thereby reducing the risk of damage to the inverter.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "another embodiment" or "certain embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0109] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A frequency converter drive device, characterized in that: include: Drive module, control module and voltage stabilization module; The driving output end of the driving module is connected to the driving input end of the control module, and the output end of the control module is connected to the input end of the voltage stabilizing module; When the pulse signal end of the driving module is in a high level state, the on-off state of the driving module is an off state; when the pulse signal end of the driving module is in a low level state and the input end of the driving module is in a high level state, the on-off state of the driving module is an on state; The voltage input terminal of the control module is externally connected to an external power supply, and the on-off state of the drive module is the same as the on-off state of the control module.

2. The frequency converter drive device according to claim 1, characterized in that: The driving module includes a driving switch circuit and an optocoupler driving circuit; The input end of the driving switch circuit serves as the input end of the driving module, and the output end of the driving switch circuit is connected to the primary input end of the optocoupler driving circuit; The primary output end of the optocoupler driving circuit serves as the pulse signal end of the driving module, and the secondary end of the optocoupler driving circuit is connected to the driving input end of the control module.

3. The frequency converter drive device according to claim 2, characterized in that: The driving switch circuit includes a first resistor, a first diode and a first transistor; The input end of the first resistor serves as the input end of the driving module, and the output end of the first resistor is connected to the input end of the first diode; The output end of the first diode is connected to the base of the first transistor, and the collector of the first transistor is connected to the primary input end of the optocoupler driving circuit.

4. The frequency converter drive device according to claim 3, characterized in that: The driving switch circuit also includes a first capacitor, a second capacitor and a second resistor; A first end of the first capacitor is grounded, and a second end of the first capacitor is connected to the emitter of the first transistor; A first end of the second capacitor is connected to the emitter of the first transistor, and a second end of the second capacitor is connected to the base of the first transistor; A first end of the second resistor is connected to a first end of the second capacitor, and a second end of the second resistor is connected to a second end of the second capacitor.

5. The frequency converter drive device according to claim 2, characterized in that: The optical coupler driving circuit includes a photoelectric coupler, a third resistor and a fourth resistor; The primary input end of the photoelectric coupler is connected to the output end of the driving switch circuit, and the primary output end of the photoelectric coupler serves as the pulse signal end of the driving module; The secondary side output terminal of the photoelectric coupler is connected to the first end of the third resistor, and the second end of the third resistor is connected to the driving input terminal of the control module; The first end of the fourth resistor is connected to the second end of the third resistor, and the second end of the fourth resistor is connected to the secondary input end of the photoelectric coupler.

6. The frequency converter drive device according to claim 5, characterized in that: The photoelectric coupler includes a TLP785 chip; The first pin of the TLP785 chip is connected to the output end of the driving switch circuit, and the second pin of the TLP785 chip serves as the pulse signal end of the driving module; The third pin of the TLP785 chip is connected to the first end of the third resistor, and the fourth pin of the TLP785 chip is connected to the second end of the fourth resistor.

7. The frequency converter drive device according to claim 1, characterized in that: The control module includes a first switch circuit and a second switch circuit; A first end of the first switch circuit is connected to a driving output end of the driving module, and a second end of the first switch circuit is connected to a first end of the second switch circuit; The second end of the second switch circuit is connected to the input end of the voltage stabilizing module.

8. The frequency converter drive device according to claim 7, characterized in that: The first switch circuit includes a second transistor, and the second switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor and a third transistor; The base of the second transistor is connected to the driving output terminal of the driving module, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the first end of the fifth resistor; The second end of the fifth resistor is connected to the emitter of the third transistor, the first end of the sixth resistor is connected to the first end of the fifth resistor, and the second end of the sixth resistor is connected to the base of the third transistor; The collector of the third transistor is connected to the input end of the voltage stabilizing module, the collector of the third transistor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

9. The frequency converter drive device according to claim 1, characterized in that: The voltage stabilizing module includes a second diode and a third capacitor; A first end of the third capacitor is connected to the output end of the control module, and a second end of the third capacitor is grounded; An input end of the second diode is connected to the second end of the third capacitor, and an output end of the second diode is connected to the first end of the third capacitor.

10. A frequency converter drive system, characterized in that: include: A frequency converter and a frequency converter drive device as claimed in any one of claims 1 to 9, wherein the frequency converter is connected to a voltage stabilizing module in the frequency converter drive device.

Images