CN117060692A - Controllable current source type gate driver and current source type gate driving assembly - Google Patents
Controllable current source type gate driver and current source type gate driving assembly Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention discloses a controllable current source type gate driver and a current source type gate driving assembly, which relate to the technical field of motor control and comprise: the power amplifier comprises an upper bridge arm of a gate driving assembly, a lower bridge arm of the gate driving assembly and a power amplifier; the upper bridge arm and the lower bridge arm respectively comprise a controllable current source type gate electrode driver connected with the input end of the power amplifier; the controllable current source type gate electrode driver controls the power amplifier to act according to the PWM control signal and the gate electrode current source control signal, and then drives the external motor to work; the PWM control signal is from the control signal of the motor control device; the gate current source control signal is determined according to the difference between the set dv/dt and the feedback dv/dt or by the motor control device according to the running state of the external motor; the feedback dv/dt is determined according to the total voltage of the upper bridge arm and the lower bridge arm and/or the voltage of the lower bridge arm end. The invention can prevent excessive dv/dt in the switching process, and has the characteristics of simple design and strong adaptability.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a controllable current source type gate driver and a current source type gate driving assembly.
Background
Industrial motors typically operate at higher voltages, for example, three-phase 380V, and after rectification, the dc bus typically operates at between 500V-800V, and the power semiconductors switch at a faster rate, resulting in greater dv/dt. In particular, to further improve efficiency and control performance, motor drivers increasingly employ third generation wide bandgap semiconductors (e.g., sicmosfets) with faster switching speeds as power switching transistors. Compared with Si material, the SiC material has the characteristics of wide forbidden band, high saturated electron drift rate, high breakdown field strength, high heat conductivity and the like, so that the SiC device has lower on-resistance, faster switching speed, higher breakdown voltage and higher heat conductivity, and the excellent characteristics bring possibility for simplifying a power electronic circuit and miniaturizing and high-efficiency of a system. Since the switching speed of SiC devices is faster (on times can reach 10-20 ns), excessive dv/dt can occur during switching.
Disclosure of Invention
The invention aims to provide a controllable current source type gate driver and a current source type gate driving assembly, which can prevent overlarge dv/dt from being generated in the switching process and have the characteristics of simple design and strong adaptability.
In order to achieve the above object, the present invention provides the following solutions:
in a first aspect, the present invention provides a controllable current source gate driver, comprising a drive control logic circuit, a current source control circuit, a first switching device, a second switching device, a first controllable current source, a second controllable current source, and a resistor;
the input end of the drive control logic circuit is used for inputting PWM control signals, and the output end of the drive control logic circuit is respectively connected with the first end of the first switching device and the first end of the second switching device; the input end of the current source control circuit is used for inputting a gate current source control signal, and the output end of the current source control circuit is respectively connected with one end of the first controllable current source and one end of the second controllable current source; the other end of the first controllable current source is connected with the second end of the first switching device, the other end of the second controllable current source is connected with the second end of the second switching device, and the third end of the first switching device and the third end of the second switching device can be connected with the input end of the power amplifier through the resistor.
Optionally, the driving control logic circuit is configured to determine an operating state of the first switching device and the second switching device according to a PWM control signal; when the PWM control signal represents a high level, the first switching device is turned on, the second switching device is turned off, the first controllable current source charges the gate electrode of a power switching tube in the power amplifier through the first switching device and the resistor, and the power switching tube is turned on; when the PWM control signal represents a low level, the first switching device is turned off, the second switching device is turned on, the second controllable current source discharges the gate electrode of the power switching tube in the power amplifier through the second switching device and the resistor, and the power switching tube is turned off.
Optionally, the current source control circuit is configured to control a current magnitude of the first controllable current source or the second controllable current source according to a gate current source control signal; the gate current source control signal is transmitted to the current source control circuit in a digital signal form or an analog signal form; the digital signal is a pulse signal or a PWM control signal.
Optionally, the current source control circuit includes an isolation module, a low pass filter circuit, and a voltage controlled current source circuit;
the isolation module is used for carrying out electric isolation and signal amplification treatment on the gate current source control signal to obtain a treated voltage signal;
the low-pass filter circuit is used for filtering high-frequency components in the processed voltage signals to obtain voltage signals after filtering operation;
the voltage control current source circuit is used for generating a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after filtering operation.
Optionally, the isolation module is a transformer isolation module, an optocoupler isolation module or an optocoupler isolation module;
when the isolation module is a transformer isolation module; the transformer isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting a transformer technology to obtain a treated voltage signal;
when the isolation module is an optical coupling isolation module; the optical coupling isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting an optical coupling isolation technology to obtain a treated voltage signal;
when the isolation module is an analog signal isolation module; the analog signal isolation module is used for electrically isolating and amplifying the gate current source control signal in the form of an analog signal by adopting an analog signal isolation technology to obtain a processed voltage signal.
In a second aspect, the present invention provides a current source gate drive assembly comprising: the power amplifier comprises an upper bridge arm of a gate driving assembly, a lower bridge arm of the gate driving assembly and a power amplifier; the upper bridge arm of the gate driving assembly at least comprises a controllable current source type gate driver, the lower bridge arm of the gate driving assembly at least comprises a controllable current source type gate driver, and the input end of the power amplifier is connected with the output ends of all the controllable current source type gate drivers;
the controllable current source type gate driver is used for controlling the power amplifier to act according to the PWM control signal and the gate current source control signal so as to drive the external motor to work; the PWM control signal is from a control signal of a motor control device; the gate current source control signal is determined according to the difference value between the set dv/dt and the feedback dv/dt or by a motor control device according to the running state of an external motor; the feedback dv/dt is determined according to the total voltage of the upper bridge arm of the gate driving assembly and the lower bridge arm of the gate driving assembly and/or the voltage of the lower bridge arm of the gate driving assembly.
Optionally, the power amplifier is composed of a plurality of power switching tubes; the controllable current source type gate driver comprises a drive control logic circuit, a current source control circuit, a first switching device, a second switching device, a first controllable current source, a second controllable current source and a resistor;
the input end of the drive control logic circuit is used for inputting the PWM control signal, and the output end of the drive control logic circuit is respectively connected with the first end of the first switching device and the first end of the second switching device; the input end of the current source control circuit is used for inputting a gate current source control signal, and the output end of the current source control circuit is respectively connected with one end of the first controllable current source and one end of the second controllable current source; the other end of the first controllable current source is connected with the second end of the first switching device, the other end of the second controllable current source is connected with the second end of the second switching device, and the third end of the first switching device and the third end of the second switching device are connected with the power amplifier through resistors;
the current source control circuit is used for controlling the current magnitude of the first controllable current source or the second controllable current source according to a gate current source control signal; the gate current source control signal is transmitted to the current source control circuit in a digital signal form or an analog signal form; the digital signal is a pulse signal or a PWM control signal.
Optionally, the driving control logic circuit is configured to determine an operating state of the first switching device and the second switching device according to a PWM control signal; when the PWM control signal represents a high level, the first switching device is turned on, the second switching device is turned off, the first controllable current source charges the gate electrode of a power switching tube in the power amplifier through the first switching device and the resistor, and the power switching tube is turned on; when the PWM control signal represents a low level, the first switching device is turned off, the second switching device is turned on, the second controllable current source discharges the gate electrode of the power switching tube in the power amplifier through the second switching device and the resistor, and the power switching tube is turned off.
Optionally, the current source control circuit includes an isolation module, a low pass filter circuit, and a voltage controlled current source circuit;
the isolation module is used for carrying out electric isolation and signal amplification treatment on the gate current source control signal to obtain a treated voltage signal;
the low-pass filter circuit is used for filtering high-frequency components in the processed voltage signals to obtain voltage signals after filtering operation;
the voltage control current source circuit is used for generating a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after filtering operation.
Optionally, the isolation module is a transformer isolation module, an optocoupler isolation module or an optocoupler isolation module;
when the isolation module is a transformer isolation module, the transformer isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting a transformer technology to obtain a treated voltage signal;
when the isolation module is an optical coupling isolation module, the optical coupling isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting an optical coupling isolation technology to obtain a treated voltage signal;
when the isolation module is an analog signal isolation module; the analog signal isolation module is used for electrically isolating and amplifying the gate current source control signal in the form of an analog signal by adopting an analog signal isolation technology to obtain a processed voltage signal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a controllable current source type gate driver and a current source type gate driving assembly, which can determine the control signal of a current source through the control signal of a motor control device and the voltages of an upper bridge arm and a lower bridge arm in the current source type gate driving assembly, and adjust the magnitude of the gate driving current of a switching device through the control signal, thereby controlling the switching speed of the switching device and further controlling the magnitude of dv/dt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a current source type gate driving assembly according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an implementation of a controllable current source type gate driver according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of a controllable current source driven by a gate current source control signal according to an embodiment of the present invention;
fig. 4 is a diagram of an implementation of a current source control circuit with a PWM control signal based on a transformer isolation technique according to an embodiment of the present invention;
fig. 5 is an isolation effect diagram of a transformer isolation module according to an embodiment of the present invention;
FIG. 6 is a diagram showing a filtering effect of a first-order low-pass filter circuit according to an embodiment of the present invention;
fig. 7 is a diagram showing a filtering effect of a voltage-controlled current source circuit according to an embodiment of the present invention;
fig. 8 is a diagram of an implementation of a current source control circuit with a PWM control signal based on an optocoupler isolation technique according to an embodiment of the present invention;
fig. 9 is a diagram of an implementation of a current source control circuit with an analog signal form as a control signal based on an analog signal optocoupler isolation technique according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a current source type gate driving assembly, including: the power amplifier comprises an upper bridge arm of a gate driving assembly, a lower bridge arm of the gate driving assembly and a power amplifier; the upper bridge arm of the gate driving assembly at least comprises one controllable current source type gate driver, the lower bridge arm of the gate driving assembly at least comprises one controllable current source type gate driver, and the input end of the power amplifier is connected with the output ends of all the controllable current source type gate drivers.
The current source type gate electrode driving component is used for controlling the power amplifier to act according to the PWM control signal and the gate electrode current source control signal so as to drive the external motor to work; the PWM control signal is from a control signal of a motor control device; the gate current source control signal is determined according to the difference value between the set dv/dt and the feedback dv/dt or by a motor control device according to the running state of an external motor; the feedback dv/dt is determined according to the total voltage of the upper bridge arm of the gate driving assembly and the lower bridge arm of the gate driving assembly and/or the voltage of the lower bridge arm of the gate driving assembly. The specific structural form of the controllable current source type gate driver is referred to in the second embodiment, and will not be described herein again.
Further, the PWM control signal is determined by a motor control section including a position loop controller, a speed loop controller, a current loop controller, and a PWM generator; the position loop controller is used for generating a speed instruction according to the position instruction and the fed-back motor position information; the speed controller is used for generating a current instruction according to the speed instruction and the fed-back motor speed information; the current loop controller is used for generating a PWM instruction according to the current instruction and the fed-back motor phase current information; the PWM generator is used for generating PWM control signals according to PWM instructions.
Further, a gate current source control signal is generated according to a difference between the set dv/dt and the feedback dv/dt or according to a current command output by the speed controller and the feedback motor phase current information.
In the embodiment of the invention, the power amplifier is composed of a plurality of power switching tubes.
Example two
As shown in fig. 2, the controllable current source type gate driver includes a driving control logic circuit 100, a current source control circuit 200, a first switching device Sp, a second switching device Sn, a first controllable current source Isp, a second controllable current source Isn, and a resistor Rg.
The first switching device Sp and the second switching device Sn can be metal oxide semiconductor field effect transistors PMOS and NMOS, and can also be bipolar transistors (bipolar junctiontransistors-BJTs) NPN and PNP.
The first controllable current source Isp is connected in series with the first switching device Sp to provide a charging loop for the gate electrode of the power switching tube; the second controllable current source Isn and the second switching device Sn are connected in series to provide a discharge loop for the gate of the power switching tube.
The input end of the driving control logic circuit 100 is used for inputting a PWM control signal, and the output end of the driving control logic circuit 100 is respectively connected with the first end of the first switching device Sp and the first end of the second switching device Sn; the input end of the current source control circuit 200 is used for inputting a gate current source control signal, and the output end of the current source control circuit 200 is respectively connected with one end of the first controllable current source Isp and one end of the second controllable current source Isn; the other end of the first controllable current source Isp is connected with the second end of the first switching device Sp, the other end of the second controllable current source Isn is connected with the second end of the second switching device Sn, and the third end of the first switching device Sp and the third end of the second switching device Sn can be connected with the power amplifier through a resistor Rg.
The driving control logic circuit 100 is configured to determine an operating state of the first switching device Sp and the second switching device Sn according to the PWM control signal, that is, select the first switching device Sp and the second switching device Sn to switch according to the input PWM control signal; for example, when the input PWM control signal is at a high level, the first switching device Sp is turned on, the second switching device Sn is turned off, and at this time, the first controllable current source Isp charges the gate of the power switching tube through the first switching device Sp and the resistor Rg, and the power switching tube is turned on; when the input PWM control signal is at a low level, the first switching device Sp is turned off, the second switching device Sn is turned on, at this time, the second controllable current source Isn discharges the gate electrode of the power switching tube through the second switching device Sn and the resistor Rg, and the power switching tube is turned off. Meanwhile, the driving control logic circuit 100 adjusts control logic for the first switching device Sp and the second switching device Sn according to the monitored state of the driving voltage.
The current source control circuit 200 is configured to control a current magnitude of the first controllable current source Isp or a current magnitude of the second controllable current source Isn according to the gate current source control signal. The gate current source control signal is a digital signal, such as a pulse or PWM control signal, or an analog signal, i.e. the gate current source control signal is fed into the current source control circuit 200 in the form of a digital signal or an analog signal.
In addition, the controllable current source type gate driver assembly shown in fig. 2 can also be used independently to control the operation of the power amplifier. Wherein: the PWM control signal controls the on and off time of the power amplifier; the gate current source control signal controls the current magnitude of the first controllable current source Isp or the current magnitude of the second controllable current source Isn so as to control the on or off characteristic of the power amplifier, and finally, the magnitude of dv/dt generated in the switching process of the power amplifier is controlled. The gate current source control signal may be a digital signal or an analog signal.
Meanwhile, the controllable current source type gate driver realizes the electric isolation of a gate current source control signal and a power-on transistor gate driving signal, and the electric isolation mode can adopt magnetic isolation, capacitance isolation, optical coupling isolation technology and the like.
As shown in fig. 3, the controllable current source driven by the gate current source control signal includes a control signal processing and electrical isolation part, a control voltage adjusting part and a voltage controlled controllable current source part.
Specifically, the current source control circuit includes an isolation module, a low pass filter circuit, and a voltage controlled current source circuit. The isolation module is used for electrically isolating and amplifying the gate current source control signal to obtain a processed voltage signal. The low-pass filter circuit is used for filtering high-frequency components in the processed voltage signals to obtain the voltage signals after the filtering operation. The voltage control current source circuit is used for generating a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after filtering operation, so as to control the current magnitude of the first controllable current source Isp or the current magnitude of the second controllable current source Isn.
As shown in fig. 4, to achieve electrical isolation of the control stage and the power stage, the present embodiment provides the isolation module as a transformer isolation module 210; the transformer isolation module 210 is configured to electrically isolate and amplify a gate current source control signal in the form of a PWM control signal using a transformer isolation technique to obtain a processed voltage signal.
As shown in fig. 5, the high level of the gate current source control signal Vin is 5V, the low level is 0V, the period is 10us (switching frequency 10 kHz), the duty ratio is 50%, and after passing through the transformer isolation module 210 with the conversion ratio of 0.5 (Vp/vs=0.5), the period and the duty ratio are unchanged, and the high level vs_h becomes 10V. The transformer isolation technique is only effective for ac input voltages, and therefore requires maximum and minimum duty cycles of the gate current source control signal, e.g., the duty cycle needs to be controlled between 5% -95%.
The low-pass filter circuit 220 is a first-order low-pass filter circuit composed of a resistor and a capacitor, and has a filter time constant τ=r 0 C 0 The method comprises the steps of carrying out a first treatment on the surface of the For example, R 0 ＝1k ohm，C 0 =1uf, filter time constant τ=1 ms. The low-pass filter circuit 220 is configured to filter the high-frequency component in the processed voltage signal Vs, to obtain a filtered voltage signal, and to serve as a control input for driving the current source, where the filtering effect is as shown in fig. 6. After passing through the low-pass filter circuit 220, the output voltage V0 is a direct current with small fluctuation, and the voltage amplitude is about v0=d×vs_h=5v, where d=0.5, vs_h=10v.
The voltage-controlled current source circuit 230 is configured to generate a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after the filtering operation.
The calculation formula of the output current of the current source is as follows:
in the present embodiment, R is as shown in FIG. 7 2 ＝R 1 ＝10kOhm，R s =10 Ohm, thus I out ≈0.5A。
Besides, the isolation module can also adopt optocoupler isolation, capacitance isolation and the like besides the transformer magnetic isolation technology, namely the isolation module is a transformer isolation module, an optocoupler isolation module or an optocoupler isolation module.
As shown in fig. 8, the isolation module is an optocoupler isolation module 211; the optocoupler isolation module 211 is configured to electrically isolate and amplify a gate current source control signal in the form of a PWM control signal by using an optocoupler isolation technology, so as to obtain a processed voltage signal.
As shown in fig. 9, the isolation module may be an analog signal isolation module 212; the analog signal isolation module 212 is configured to electrically isolate and amplify a gate current source control signal in the form of an analog signal by using an analog signal isolation technique, so as to obtain a processed voltage signal.
As shown in fig. 9, a phototransistor optocoupler is used to transmit analog signals. The input analog signal control signal Vin adjusts the base control voltage of the PNP transistor Q11 through a voltage follower, so that the magnitude of current flowing through the light emitting diode D11 is adjusted through a current limiting resistor R11, a circuit of the transistor Q11 and the light emitting diode D11, and the intensity of light emitted by the light emitting diode is changed; the photo transistor Q12 generates a current If by receiving the light emitted from the D11, and the magnitude of the current If is proportional to the intensity of the generated light. Output voltage vs=r12×if. The output voltage is thus managed in proportion to the control voltage VIN, vs=k. The magnitude of the specific gain k is related to the magnitude of the resistance values of R11 and R12, the current amplification factor of the transistor Q11, and the current transmission ratio of D11 to Q12, and specific design is required according to actual requirements.
Fig. 9 is only a specific embodiment supporting analog signals as gate current source control signals, and the control signals may also be transmitted in signal isolation by using other analog signal isolation principles including Sigma-Delta.
Compared with the prior art, the invention has the following beneficial effects:
1) A controllable current source (Isp, isn) is connected in series with the switching device (Sp, sn) to provide a charge and discharge loop for the power switching transistor gate.
2) The invention can realize continuous adjustment of the gate driving capability through continuous control signals, thereby eliminating waveform distortion and oscillation caused by discontinuous driving. The gate current source control signal may be a digital signal in the form of a pulse such as PWM, or may be an analog signal.
When the gate current source control signal is given in the form of PWM, the duty cycle of PWM represents the magnitude of the drive current; the duty ratio information is transmitted to a high-voltage side current source control circuit through an isolation technology; and then the duty ratio information is converted into corresponding direct current voltage information through a low-pass filter. Finally, the control of the driving current is realized by the voltage control current source circuit.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The controllable current source type gate driver is characterized by comprising a drive control logic circuit, a current source control circuit, a first switching device, a second switching device, a first controllable current source, a second controllable current source and a resistor;
the input end of the drive control logic circuit is used for inputting PWM control signals, and the output end of the drive control logic circuit is respectively connected with the first end of the first switching device and the first end of the second switching device; the input end of the current source control circuit is used for inputting a gate current source control signal, and the output end of the current source control circuit is respectively connected with one end of the first controllable current source and one end of the second controllable current source; the other end of the first controllable current source is connected with the second end of the first switching device, the other end of the second controllable current source is connected with the second end of the second switching device, and the third end of the first switching device and the third end of the second switching device can be connected with the input end of the power amplifier through the resistor.
2. The controllable current source gate driver of claim 1 wherein the drive control logic is configured to determine the operating states of the first and second switching devices based on PWM control signals; when the PWM control signal represents a high level, the first switching device is turned on, the second switching device is turned off, the first controllable current source charges the gate electrode of a power switching tube in the power amplifier through the first switching device and the resistor, and the power switching tube is turned on; when the PWM control signal represents a low level, the first switching device is turned off, the second switching device is turned on, the second controllable current source discharges the gate electrode of the power switching tube in the power amplifier through the second switching device and the resistor, and the power switching tube is turned off.
3. The controllable current source gate driver of claim 1, wherein the current source control circuit is configured to control a current magnitude of the first controllable current source or the second controllable current source according to a gate current source control signal; the gate current source control signal is transmitted to the current source control circuit in a digital signal form or an analog signal form; the digital signal is a pulse signal or a PWM control signal.
4. A controllable current source gate driver according to claim 3, wherein the current source control circuit comprises an isolation module, a low pass filter circuit and a voltage controlled current source circuit;
the isolation module is used for carrying out electric isolation and signal amplification treatment on the gate current source control signal to obtain a treated voltage signal;
the low-pass filter circuit is used for filtering high-frequency components in the processed voltage signals to obtain voltage signals after filtering operation;
the voltage control current source circuit is used for generating a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after filtering operation.
5. The controllable current source gate driver of claim 4, wherein the isolation module is a transformer isolation module, an optocoupler isolation module, or an optocoupler isolation module;
when the isolation module is a transformer isolation module; the transformer isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting a transformer technology to obtain a treated voltage signal;
when the isolation module is an optical coupling isolation module; the optical coupling isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting an optical coupling isolation technology to obtain a treated voltage signal;
when the isolation module is an analog signal isolation module; the analog signal isolation module is used for electrically isolating and amplifying the gate current source control signal in the form of an analog signal by adopting an analog signal isolation technology to obtain a processed voltage signal.
6. A current source gate drive assembly, comprising: the power amplifier comprises an upper bridge arm of a gate driving assembly, a lower bridge arm of the gate driving assembly and a power amplifier; the upper bridge arm of the gate driving assembly at least comprises a controllable current source type gate driver, the lower bridge arm of the gate driving assembly at least comprises a controllable current source type gate driver, and the input end of the power amplifier is connected with the output ends of all the controllable current source type gate drivers;
the controllable current source type gate driver is used for controlling the power amplifier to act according to the PWM control signal and the gate current source control signal so as to drive the external motor to work; the PWM control signal is from a control signal of a motor control device; the gate current source control signal is determined according to the difference value between the set dv/dt and the feedback dv/dt or by a motor control device according to the running state of an external motor; the feedback dv/dt is determined according to the total voltage of the upper bridge arm of the gate driving assembly and the lower bridge arm of the gate driving assembly and/or the voltage of the lower bridge arm of the gate driving assembly.
7. The current source gate drive assembly of claim 6, wherein the power amplifier is comprised of a plurality of power switching transistors; the controllable current source type gate driver comprises a drive control logic circuit, a current source control circuit, a first switching device, a second switching device, a first controllable current source, a second controllable current source and a resistor;
the input end of the drive control logic circuit is used for inputting the PWM control signal, and the output end of the drive control logic circuit is respectively connected with the first end of the first switching device and the first end of the second switching device; the input end of the current source control circuit is used for inputting a gate current source control signal, and the output end of the current source control circuit is respectively connected with one end of the first controllable current source and one end of the second controllable current source; the other end of the first controllable current source is connected with the second end of the first switching device, the other end of the second controllable current source is connected with the second end of the second switching device, and the third end of the first switching device and the third end of the second switching device are connected with the power amplifier through resistors;
the current source control circuit is used for controlling the current magnitude of the first controllable current source or the second controllable current source according to a gate current source control signal; the gate current source control signal is transmitted to the current source control circuit in a digital signal form or an analog signal form; the digital signal is a pulse signal or a PWM control signal.
8. The current-source gate drive assembly of claim 7, wherein the drive control logic is configured to determine the operating states of the first switching device and the second switching device based on PWM control signals; when the PWM control signal represents a high level, the first switching device is turned on, the second switching device is turned off, the first controllable current source charges the gate electrode of a power switching tube in the power amplifier through the first switching device and the resistor, and the power switching tube is turned on; when the PWM control signal represents a low level, the first switching device is turned off, the second switching device is turned on, the second controllable current source discharges the gate electrode of the power switching tube in the power amplifier through the second switching device and the resistor, and the power switching tube is turned off.
9. The current-source gate drive assembly of claim 7, wherein the current-source control circuit comprises an isolation module, a low-pass filter circuit, and a voltage-controlled current-source circuit;
the isolation module is used for carrying out electric isolation and signal amplification treatment on the gate current source control signal to obtain a treated voltage signal;
the low-pass filter circuit is used for filtering high-frequency components in the processed voltage signals to obtain voltage signals after filtering operation;
the voltage control current source circuit is used for generating a control signal of the first controllable current source or a control signal of the second controllable current source according to the voltage signal after filtering operation.
10. The current source gate drive assembly of claim 9, wherein the isolation module is a transformer isolation module, an optocoupler isolation module, or an optocoupler isolation module;
when the isolation module is a transformer isolation module, the transformer isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting a transformer technology to obtain a treated voltage signal;
when the isolation module is an optical coupling isolation module, the optical coupling isolation module is used for carrying out electric isolation and signal amplification treatment on a gate current source control signal in the form of a PWM control signal by adopting an optical coupling isolation technology to obtain a treated voltage signal;
when the isolation module is an analog signal isolation module; the analog signal isolation module is used for electrically isolating and amplifying the gate current source control signal in the form of an analog signal by adopting an analog signal isolation technology to obtain a processed voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311066374.9A CN117060692A (en) | 2023-08-23 | 2023-08-23 | Controllable current source type gate driver and current source type gate driving assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311066374.9A CN117060692A (en) | 2023-08-23 | 2023-08-23 | Controllable current source type gate driver and current source type gate driving assembly |
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| CN202311066374.9A Pending CN117060692A (en) | 2023-08-23 | 2023-08-23 | Controllable current source type gate driver and current source type gate driving assembly |
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| CN (1) | CN117060692A (en) |
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