Driving power supply architecture of power module and motor controller

Abstract

The invention provides a driving power supply architecture of a power module and a motor controller, and relates to the technical field of vehicle motor control, and the driving power supply architecture comprises a driving power supply which comprises a driving power supply wave generation control circuit and a driving power supply power level circuit; the feedforward control unit is used for acquiring the output of the single chip microcomputer to determine the tube opening time, the gate-level charge quantity and the switching frequency of the power module; at the tube opening moment, the feed-forward control unit determines load driving power according to the gate-level charge quantity of the power module, the driving voltage of the power module and the switching frequency and outputs a feed-forward control signal to the driving power supply wave sending control circuit so as to synchronously adjust the duty ratio or the frequency of the driving power supply; the problems that under constant voltage input of an existing open-loop driving power supply, output driving voltage drops after a load is increased, so that power module loss is increased, and system efficiency is reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle motor control, and in particular to a driving power supply architecture of a power module and a motor controller. Background Art

[0002] The driving power supply of the power module plays a vital role in power electronic equipment. It not only needs to provide sufficient driving current and voltage, but also needs to ensure stable signal transmission and electrical isolation. Automotive motor controllers often use isolated power supplies to drive power modules.

[0003] Most existing isolated power supplies use constant voltage input and open-loop control to eliminate the need for power control ICs. However, when the electronic control is turned on, the load on the power module's rear stage increases, causing the drive voltage to decrease. This will increase the conduction loss of the power module and reduce system efficiency. Especially when SiC modules are used, the voltage drop loss will increase further, further reducing system efficiency. Summary of the invention

[0004] In order to overcome the above technical defects, the purpose of the present invention is to provide a driving power supply architecture and a motor controller for a power module to solve the problem that the existing open-loop driving power supply has a constant voltage input and the output driving voltage is reduced, resulting in reduced system efficiency.

[0005] The present invention discloses a driving power supply architecture of a power module, comprising:

[0006] A driving power supply, including a driving power supply wave control circuit and a driving power supply power stage circuit;

[0007] The feedforward control unit obtains the output of the microcontroller to determine the start-up time and switching frequency of the power module;

[0008] At the moment of tube opening, the feedforward control unit determines the load driving power according to the gate-level charge of the power module, the driving voltage of the power module and the switching frequency, and outputs a feedforward control signal to the driving power supply wave control circuit to synchronously adjust the duty cycle or frequency of the driving power supply.

[0009] Preferably, the feedforward control unit is integrated into the single chip microcomputer;

[0010] The single chip microcomputer outputs a feedforward control signal according to the load driving power to adjust the duty cycle of the driving power supply.

[0011] Preferably, the feedforward control unit is integrated into the single chip microcomputer by connecting a pin on the single chip microcomputer to a driving power supply wave control circuit of the driving power supply.

[0012] Preferably, the feedforward control unit comprises a frequency-to-analog quantity circuit;

[0013] The frequency-to-analog quantity circuit obtains the driving signal output by the single-chip microcomputer to the driving chip, determines the load driving power according to the driving signal, outputs a feedforward control signal, and adjusts the duty cycle of the driving power supply.

[0014] Preferably, the frequency-to-analog quantity conversion circuit acquires the driving signal and normalizes it to output a feedforward control signal.

[0015] Preferably, the frequency-to-analog quantity conversion circuit comprises a discrete circuit or an integrated chip.

[0016] Preferably, the positive electrode of the comparator of the driving power supply ripple control circuit receives the feedforward control signal output by the feedforward control unit, and the negative electrode of the comparator of the driving power supply ripple control circuit receives the autonomously generated sawtooth wave signal, and the comparator of the driving power supply ripple control circuit is controlled to flip according to the feedforward control signal and the sawtooth wave signal to adjust the duty cycle or frequency of the driving power supply.

[0017] Preferably, the driving power supply includes a forward power supply or an LLC driving power supply.

[0018] Preferably, when the driving power supply is an LLC driving power supply, the feedforward control unit synchronously adjusts the frequency of the driving power supply according to the driving power.

[0019] The present invention also provides a motor controller, comprising a driving power supply architecture of the power module described in any one of the above items.

[0020] Compared with the prior art, the above technical solution has the following beneficial effects:

[0021] The present application provides a power module driving power supply architecture and a motor controller that performs feedforward control on the driving power supply input side, that is, a feedforward control signal output by a feedforward control unit (which can be integrated in a single-chip microcomputer or a hardware circuit (frequency to analog quantity circuit) independent of the single-chip microcomputer) thereby synchronously adjusting the duty cycle or frequency of the driving power supply according to the load increased after the electronic control tube is opened, thereby achieving dynamic adjustment of the driving power supply so that the driving power supply output meets the load requirements of the power module, thereby solving the problem of increased power module loss and reduced system efficiency caused by the output driving voltage drop after the load increases under constant voltage input of the existing open-loop driving power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a module of a driving power supply architecture and a motor controller embodiment of a power module according to the present invention;

[0023] Figure 2 A schematic diagram of a module controlled by a single chip microcomputer in a driving power supply architecture of a power module and a motor controller embodiment of the present invention;

[0024] Figure 3 A circuit diagram of a forward drive power supply example controlled by a single-chip microcomputer in a drive power supply architecture of a power module and a motor controller embodiment of the present invention;

[0025] Figure 4 A schematic diagram of a driving power supply output signal of a forward driving power supply controlled by a single-chip microcomputer in a driving power supply architecture of a power module and a motor controller embodiment of the present invention;

[0026] Figure 5 A schematic diagram of a module controlled by a frequency-to-analog quantity circuit in a driving power supply architecture of a power module and an embodiment of a motor controller according to the present invention;

[0027] Figure 6 A circuit diagram of an example of a forward drive power supply controlled by a frequency-to-analog quantity circuit in a drive power supply architecture of a power module and a motor controller embodiment of the present invention;

[0028] Figure 7 A schematic diagram of a driving power supply output signal of an example of a forward driving power supply controlled by a frequency-to-analog quantity circuit in a driving power supply architecture of a power module and a motor controller embodiment of the present invention;

[0029] Figure 8 A circuit diagram of an LLC driving power source controlled by a single chip microcomputer in a driving power source architecture of a power module and a motor controller embodiment of the present invention;

[0030] Fig. 9 The present invention is a schematic diagram of a driving power supply architecture of a power module and a motor controller embodiment of a driving power supply output signal using an LLC driving power supply controlled by a single chip microcomputer as an example.

[0031] Reference numerals:

[0032] 11-driving power supply wave control circuit; 12-driving power supply power stage circuit; 2-feedforward control unit; 3-single chip microcomputer; 31-driving wave module; 4-power module; 5-driving chip. DETAILED DESCRIPTION

[0033] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0035] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0036] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, these information should not be limited to these terms. Depending on the context, the word "if" as used herein can be interpreted as "at the time" or "when" or "in response to determining".

[0037] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0038] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0039] In the following description, the suffixes such as "module", "component" or "unit" used to represent the elements are used only to facilitate the description of the present invention, and they themselves have no specific meaning. Therefore, "module" and "component" can be used interchangeably. As an illustration, the "power module" described in the present invention is a power semiconductor element in the electric control, not "power + module".

[0040] Embodiment: This embodiment discloses a driving power supply architecture of a power module, which provides a feedforward control method of the driving power supply. By using the electronically controlled open tube as a flag, the load (output) capacity of the driving power supply is adjusted to reduce the risk of driving voltage drop to meet the requirements of low cost and system efficiency.

[0041] Specifically, the drive power architecture, see Figure 1 / Figure 5 ,include:

[0042] The driving power supply includes a driving power supply wave control circuit and a driving power supply power stage circuit; it is understandable that the driving power supply wave control circuit can be generated by a single-chip microcomputer or other microcontroller, or it can be built by discrete devices to process the generated PWM signal, such as filtering, amplification, etc., and it can also have a variety of protection functions, such as undervoltage protection, overcurrent protection, short circuit protection, etc.; the driving power supply power stage circuit is mainly used to provide sufficient driving current and voltage, and the output voltage to the power module is controlled by the driving power supply wave control circuit through the input voltage at the power supply end. The driving power supply wave control circuit is mainly responsible for signal generation, conditioning and protection, and the driving power supply power stage circuit is mainly responsible for providing isolated driving power and power amplification.

[0043] In this embodiment, a feedforward signal (i.e., the feedforward control signal described below) is further provided to the driving power supply ripple control circuit, so as to achieve the purpose of adjusting the driving power supply. Specifically, a feedforward control unit is provided to obtain the output (PWM signal) of the single-chip microcomputer to determine the on-time and switching frequency of the power module; at the on-time, the feedforward control unit determines the load driving power according to the gate-level charge of the power module (known), the driving voltage of the power module (known) and the switching frequency obtained above, and outputs the feedforward control signal to the driving power supply ripple control circuit to synchronously adjust the duty cycle or frequency of the driving power supply.

[0044] As an illustration, the single chip microcomputer acts on the power module (located in the driving circuit of the power module), and the single chip microcomputer may also include a driving wave generating module (see Figure 2 or Figure 5 ) is used to send PWM signals to the driver chip, so as to cooperate with the output of the driving power supply to control the power module. In the existing general design, the single-chip microcomputer sends PWM signals to the driver chip through the driving wave module to control the power module. The driving power supply wave control circuit controls the output voltage of the driving power supply to the power module. The driving power supply and the control chip are independent and cooperate to control the power module on the output side. Therefore, when the electronic control opens the tube, the single-chip microcomputer will output a PWM signal of the corresponding frequency. Therefore, in this embodiment, the driving power supply can directly obtain the PWM signal.

[0045] Specifically, the load driving power of the power module can be determined according to the gate level charge and the switching frequency. Specifically, according to the following formula: DRV =(V p -V N )×Q g ×f sw =V DRV ×Q g ×f sw , where Vp is the positive voltage output by the driving power supply, V N The driving power supply outputs negative voltage, Q g is the gate charge, f sw is the switching frequency; the gate-level charge is the parameter of the power module itself, the positive voltage output of the driving power supply and the negative voltage output of the driving power supply are known parameters (required), from which the load driving power P can be directly obtained DRV , that is, to obtain the load capacity that the driving power supply needs to output.

[0046] As an illustration, the feedforward control unit can be a virtual component, such as a carrier of a program, specifically integrated into a single-chip microcomputer as follows (the existing single-chip microcomputer is independent of the driving power supply in the control circuit of the power module, and the present embodiment can output a feedforward control signal to the wave control circuit of the driving power supply after integration), and may also include a hardware circuit independent of the driving power supply and the single-chip microcomputer, specifically a frequency-to-analog circuit as described below.

[0047] In this embodiment, the positive electrode of the comparator of the driving power waving control circuit receives the feedforward control signal output by the feedforward control unit, and the negative electrode of the comparator of the driving power waving control circuit receives the autonomously generated sawtooth wave signal. The comparator of the driving power waving control circuit is controlled to flip according to the feedforward control signal and the sawtooth wave signal to adjust the duty cycle or frequency of the driving power supply, so that it is integrated in a single-chip microcomputer and controlled by the single-chip microcomputer. As an example, the single-chip microcomputer outputs a signal A: 2V before turning on the tube, the tube turning on time is t0, and it is 2.25V after t0. The driving power waving control circuit generates a sawtooth wave signal B of 0 to 5V through the hardware circuit it includes, and thus the signals A and B are compared by the comparator to output a PWM signal C. The duty cycle is 40% before the tube is turned on, the tube is turned on at t0, and the duty cycle is 55% after t0. The output signal D of the driving power supply is: 10mA before the tube is turned on, the tube is turned on at t0, and 80mA after t0. The corresponding power increases from 0.24W to 1.92W, thereby realizing the adjustment of the driving power supply load.

[0048] As mentioned above, this embodiment performs feedforward control on the front side of the driving power supply, that is, the input side of the driving power supply wave control circuit, that is, receives the feedforward control signal output by the feedforward control unit, thereby adjusting the duty cycle or frequency of the driving power supply, and realizing dynamic adjustment of the driving power supply, so that the output of the driving power supply meets the load requirements of the power module. Different from the existing open-loop driving power supply, under constant voltage input, the load of the rear-stage power module increases, resulting in increased losses and reduced system efficiency. The load (output) of the driving power supply can be synchronously adjusted according to the load driving power.

[0049] In a preferred embodiment, Figure 2-4 As shown, the feedforward control unit is integrated in the single chip microcomputer; that is, the program is directly preset in the single chip microcomputer to realize the processing of the PWM signal, that is, the single chip microcomputer outputs a feedforward control signal according to the load driving power to adjust the duty cycle of the driving power supply.

[0050] Specifically, the above-mentioned feedforward control unit is integrated into the single-chip microcomputer by connecting a pin on the single-chip microcomputer to the driving power supply wave generation control circuit of the driving power supply, that is, a pin on the single-chip microcomputer is connected to the driving power supply wave generation control circuit in advance, and at the same time, the above-mentioned program that can output the feedforward control signal according to the load driving power is preset in the single-chip microcomputer, thereby realizing direct control of the driving power supply through the single-chip microcomputer.

[0051] In this embodiment, the feedforward control module is integrated into the single-chip microcomputer, which outputs a feedforward control signal (0-5V analog signal), which is compared with the sawtooth wave signal in the driving power supply wave control circuit to adjust the duty cycle of the MOSFET device (MOS tube). At the same time, the driving wave module in the single-chip microcomputer complementally drives the PWM signal to the driving chip, thereby adjusting the driving power output.

[0052] As an example, take the forward drive power supply controlled by a single chip microcomputer as an example, the specific circuit structure is as follows Figure 3 (The right side of the drive power wave control circuit is the drive power power stage circuit, power module, etc.) as shown:

[0053] A pin of the single-chip microcomputer (output feedforward control signal V4) is connected to the positive electrode of the comparator U1 of the driving power supply wave generation control circuit of the driving power supply. The negative electrode of the comparator U1 generates a sawtooth wave signal from the driving power supply wave generation control circuit (hardware circuit input V1). After the electronic control tube is turned on, the single-chip microcomputer outputs signal A, and the sawtooth wave signal of 0 to 5V is signal B. The output end of the comparator U1 is connected to the AND gate trigger U9. The signals A and B are compared by the comparator U1 to output the PWM signal C to start the MOSFET device in the driving power supply power stage circuit, and adjust its duty cycle to output through the driving power supply power stage circuit. The output signal D is used for the power module.

[0054] The above-mentioned comparator U1 and AND gate trigger U9 are both devices in the driving power supply wave control circuit, and also include devices such as resistors and / or capacitors to achieve normal operation of the circuit. The forward driving power supply driving power supply power stage circuit has a power supply terminal P15, and also includes an inverter, MOSFET devices resistors, capacitors, inductors, etc. Its specific structure is similar to the existing forward driving power supply topology distribution (the following examples are also similar), and will not be repeated here.

[0055] In this example, signal A: 2V before the tube is turned on, the tube is turned on at t0, and it is 2.25V after t0; comparator U1 outputs signal C: the duty cycle before the tube is turned on is 40%, the tube is turned on at t0, and the duty cycle is 55% after t0; signal D: 10mA before the tube is turned on, the tube is turned on at t0, and it is 80mA after t0. The corresponding power increases from 0.24W to 1.92W, thereby realizing the single-chip microcomputer control driving power supply.

[0056] like Figure 4 As shown, Figure 4 This is a schematic diagram of the output signal of the driving power supply using the above circuit structure. As shown in the figure, the light red curve below is the output signal of the driving power supply before (existing) this implementation, which drops more after T0, and the dark red curve above is the output signal of the driving power supply after this implementation, which drops relatively less after T0. Based on this, after the transformer turns ratio is determined, the maximum theoretical gain of input and output is the transformer turns ratio. Therefore, under the above topology, the duty cycle increases and the output voltage drops by about 30%.

[0057] In another preferred embodiment, see Figure 5-7 The feedforward control unit includes a frequency-to-analog quantity circuit; that is, a hardware circuit, which obtains the drive signal output by the microcontroller to the drive chip (that is, the output of the microcontroller) and outputs a feedforward control signal according to the load drive power to adjust the duty cycle of the drive power supply.

[0058] Specifically, the frequency-to-analog quantity circuit is a circuit that converts a frequency signal into an analog voltage or current signal. Specifically, it can be implemented by a low-pass filter (using the charging and discharging characteristics of the capacitor to filter out the high-frequency pulse part of the PWM signal, leaving an average voltage), an integration circuit (the output voltage of the integrator is proportional to the integral of the input signal, so the duty cycle of the PWM signal determines the integration result), etc. In this embodiment, the frequency-to-analog quantity circuit obtains the drive signal of each bridge arm under the driver chip according to the output of the single-chip microcomputer and normalizes it to output a feedforward control signal (0-5V analog signal). As an example, the frequency-to-analog quantity circuit includes an RS trigger, whose input is the signal UH\UL of the upper and lower bridge arms of the U phase, which is a complementary signal with a frequency of 10kHz and a duty cycle of 30%. After the RS trigger, it outputs a square wave signal with a frequency of 10kHz and a duty cycle of 50%.

[0059] It can be understood that, at the same time, the driving wave generating module in the single chip cooperates with the feedforward control unit to output complementary driving PWM signals to the driving chip to control the power module.

[0060] As an example, take the forward drive power supply controlled by the frequency-to-analog quantity circuit as an example. The specific circuit structure is as follows: Figure 5 As shown (the right side of the drive power supply wave control circuit is the drive power supply power stage circuit, power module, etc.):

[0061] The frequency-to-analog quantity circuit includes a trigger U35, a resistor R3, and a capacitor C2; the trigger U35 input is the signal UH\UL (signal A) of the upper and lower bridge arms of the U phase, and the trigger U35 is connected to the resistor R3 and the capacitor C2 to output a feedforward control signal (signal C) to the driving power supply wave control circuit. The driving power supply wave control circuit includes devices such as diodes and capacitors. The feedforward control signal is transmitted to the positive electrode of the comparator U2 in the driving power supply power stage circuit, and the negative electrode of the comparator U2 is generated by the driving power supply wave control circuit (hardware circuit) to generate a sawtooth wave signal (signal B). The MOSFET device in the driving power supply power stage circuit is flipped and started by comparing the feedforward control signal and the sawtooth wave signal, and its duty cycle is adjusted to be output through the driving power supply power stage circuit. The output signal D is used for the power module.

[0062] Signal A: 0V before the tube is turned on, the tube is turned on at t0, and after t0, it is a complementary signal with a frequency of 10kHz and a duty cycle of 30%; Signal B: 0-5V sawtooth wave signal; Signal C: Signal A outputs a square wave signal C with a frequency of 10kHz and a duty cycle of 50% after the RS trigger, and signal C is 2.5V after RC filtering; Signal D: 10mA before the tube is turned on, the tube is turned on at t0, and after t0, it is 80mA. The corresponding power increases from 0.24W to 1.92W.

[0063] like Figure 7As shown, Figure 7 The schematic diagram of the output signal of the driving power supply using the above circuit structure shows that the output signal of the driving power supply gradually recovers after falling after time T0. This is mainly because the frequency-to-analog circuit is a hardware circuit independent of the single-chip microcomputer, so there is a partial time delay (therefore, from the perspective of response efficiency, it is also preferred to integrate the feedforward control unit into the single-chip microcomputer control). Based on this, it can be seen that after the single-chip microcomputer sends a wave, after the delay adjusted by the frequency-to-analog circuit, after adjusting the PWM, the PWM increases to 55%.

[0064] In this embodiment, the driving power supply includes a forward power supply or an LLC driving power supply. It can be understood that the forward power supply or the LLC driving power supply includes two different circuit topologies. The forward power supply uses a switch tube (such as MOSFET) for switching operation, and realizes voltage conversion through periodic switching. The LLC driving power supply forms a high-frequency oscillation voltage through the interaction of a resonant inductor and a resonant capacitor, and realizes a rectangular wave voltage at the output end by adjusting the operating frequency of the switch tube, which can be respectively applied to different scenarios.

[0065] It can be understood that for the above-mentioned forward power supply or LLC drive power supply, the feedforward control unit can be a virtual component or can include a hardware circuit, which can be freely combined for use in different scenarios. In addition, other power supply topologies that can realize the above-mentioned feedforward control signal (adjusting the frequency or duty cycle of the MOSFET device) can also be used here.

[0066] As an illustration, as a preference, when the driving power supply applies an LLC driving power supply, the feedforward control unit synchronously adjusts the frequency of the driving power supply according to the driving power. Due to the different circuit topologies in the forward power supply or the LLC driving power supply, for ease of operation, the LLC driving power supply provides upper and lower tube driving input terminals, and the PWM has a 40% duty cycle, but the frequency is variable, thereby sending a virtual signal to adjust the frequency of the driving power supply.

[0067] As an example, take the LLC drive power supply controlled by a single chip microcomputer. For the specific circuit structure, refer to Figure 8 (Only the circuit topology in LLC driver power supply is shown). The feedforward control signal output by the microcontroller is transmitted to the upper and lower tube drive sides Vg_h and Vg_l. Before the tube is turned on, it is 595kHz, the tube is turned on at t0, and after t0, it is 557kHz. Therefore, the driver power supply outputs the tube at t0, and after t0, it is 80mA. The corresponding power increases from 0.24W to 1.92W.

[0068] like Fig. 9As shown, Figure 9 is a reference diagram of the output signal of the driving power supply using the above-mentioned circuit structure. By applying the feedforward frequency modulation at time t0 of this embodiment, the gain of the LLC driving circuit is increased, and the output voltage drop is significantly improved compared to the original state (dark red curve, the light red curve below is the output signal of the existing method).

[0069] For illustration, the driving power supply wave control circuit / driving power supply power stage circuit and even the frequency-to-analog quantity circuit in the circuit structures of the above-mentioned examples may apply other existing achievable circuits, wherein the capacitors, inductors and other devices used therein are not fully described / shown and are only used for examples.

[0070] This embodiment also provides a motor controller, including a driving power supply architecture of the power module described in any of the above items. It can be understood that it includes a driving power supply (driving power supply wave control circuit and driving power supply power stage circuit), a feedforward control unit, a single-chip microcomputer (driving wave module), a driving chip and a power module. The feedforward control unit (integrated in the single-chip microcomputer or set to a frequency-to-analog quantity circuit) synchronously adjusts the output of the driving power supply according to the output of the single-chip microcomputer.

[0071] The motor controller can be used in various types of vehicles or other application scenarios.

[0072] The drive power supply architecture and motor controller provided in this embodiment are controlled at the input side of the drive power supply wave control circuit of the drive power supply, without the need for an independent power supply chip, meeting low-cost requirements, dynamically adjusting the duty cycle or frequency of the drive power supply, reducing output voltage drop, reducing conduction loss, and improving system efficiency; since control is only performed when the electronic control tube is turned on, it can also avoid excessive drive voltage in static state, reduce short-circuit current, and improve system reliability.

[0073] As further emphasized, the drive power supply architecture provided in this embodiment is different from the existing general drive power supply. Figure 1 As an example), the single-chip microcomputer (through the driving wave module) controls the driving chip and the driving power supply respectively in two lines to control the power module, and in this embodiment, the feedforward control unit obtains the output of the single-chip microcomputer and controls the input side of the driving power supply. The feedforward control unit is integrated into the single-chip microcomputer (virtual module, such as Figure 2 , 3 , 8) or independent of the microcontroller (hardware circuit, such as Figure 5 , 6 ), the load driving power is calculated by the gate-level charge and the switching frequency, and a feedforward control signal is output to control the output of the driving power supply, thereby effectively reducing the risk of the driving power supply output dropping. It is also different from other existing control strategies on the output side of the driving power supply, has a low cost, and avoids excessive driving voltage in static state.

[0074] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A driving power supply architecture of a power module, characterized in that: include: A driving power supply, including a driving power supply wave control circuit and a driving power supply power stage circuit; The feedforward control unit obtains the output of the microcontroller to determine the start-up time and switching frequency of the power module; At the turn-on moment, the feedforward control unit determines the load driving power according to the gate-level charge of the power module, the driving voltage of the power module and the switching frequency, and outputs a feedforward control signal to the driving power supply wave control circuit to synchronously adjust the duty cycle or frequency of the driving power supply.

2. The driving power supply architecture according to claim 1, characterized in that: The feedforward control unit is integrated into a single chip microcomputer; The single chip microcomputer outputs a feedforward control signal according to the load driving power to adjust the duty cycle of the driving power supply.

3. The driving power supply architecture according to claim 2, characterized in that: The feedforward control unit is integrated into the single chip microcomputer by connecting a pin on the single chip microcomputer to the driving power supply wave generating control circuit of the driving power supply.

4. The driving power supply architecture according to claim 1, characterized in that: The feedforward control unit includes a frequency-to-analog quantity circuit; The frequency-to-analog quantity circuit obtains the driving signal output by the single-chip microcomputer to the driving chip, determines the load driving power according to the driving signal, outputs a feedforward control signal, and adjusts the duty cycle of the driving power supply.

5. The driving power supply architecture according to claim 4, characterized in that: The frequency-to-analog quantity circuit acquires the driving signal and normalizes it to output a feedforward control signal.

6. The driving power supply architecture according to claim 4, characterized in that: The frequency-to-analog quantity conversion circuit includes a discrete circuit or an integrated chip.

7. The driving power supply architecture according to claim 1, characterized in that: The positive electrode of the comparator of the driving power supply ripple control circuit receives the feedforward control signal output by the feedforward control unit, and the negative electrode of the comparator of the driving power supply ripple control circuit receives the autonomously generated sawtooth wave signal. The comparator of the driving power supply ripple control circuit is controlled to flip according to the feedforward control signal and the sawtooth wave signal to adjust the duty cycle or frequency of the driving power supply.

8. The driving power supply architecture according to claim 1, characterized in that: The driving power supply includes a forward power supply or an LLC driving power supply.

9. The driving power supply architecture according to claim 8, characterized in that: When the driving power source is an LLC driving power source, the feedforward control unit synchronously adjusts the frequency of the driving power source according to the driving power.

10. A motor controller, characterized in that: A driving power supply architecture comprising the power module according to any one of claims 1 to 9.

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