Drive control unit, drive control method, electronic device, and drive system

Abstract

The invention provides a driving control unit, a driving control method, electronic equipment and a driving system. The driving control unit comprises a controller, a driving circuit and a resistance control circuit, the controller is used for collecting operation parameters of the voltage conversion device and outputting a resistance control signal to the resistance control circuit based on the operation parameters; the operation parameters comprise port voltage and / or port current; the resistance control circuit is used for conducting a target resistor corresponding to the resistance control signal in the resistance control circuit; the switched-on target resistor is connected between the driving circuit and the voltage conversion device; the target resistor is used for adjusting the current change rate of the voltage conversion device; the controller is further configured to: output a first control signal of the voltage conversion device to the drive circuit based on the operating parameter; the driving circuit is used for outputting a driving signal corresponding to the first control signal and inputting the driving signal to the voltage conversion device through the target resistor. According to the mode, the electric energy conversion efficiency of the voltage conversion device is improved.

Description

Technical Field

[0001] The present application relates to the field of electric energy drive technology, and in particular to a drive control unit, a drive control method, an electronic device, and a drive system. Background Art

[0002] The voltage converter converts the DC power in the energy storage device into AC power, which drives the motor. To ensure normal operation of the voltage converter under harsh operating conditions, the hardware parameters in the voltage converter have a high safety margin. This results in low energy conversion efficiency under normal operating conditions. Summary of the Invention

[0003] In view of this, an object of the present application is to provide a drive control unit, a drive control method, an electronic device and a drive system to improve the power conversion efficiency of a voltage conversion device.

[0004] In the first aspect, an embodiment of the present application provides a drive control unit, which includes: a controller, a drive circuit and a resistance control circuit; the controller is respectively connected to a voltage conversion device, a drive circuit and a resistance control circuit; the drive circuit is also connected to the resistance control circuit, and the resistance control circuit is also connected to the voltage conversion device; the controller is used to: collect operating parameters of the voltage conversion device, and output a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; the resistance control circuit is used to: turn on the target resistance corresponding to the resistance control signal in the resistance control circuit; wherein the target resistance after conduction is connected between the drive circuit and the voltage conversion device; the target resistance is used to adjust the current change rate of the voltage conversion device; the controller is also used to: output a first control signal of the voltage conversion device to the drive circuit based on the operating parameters; the drive circuit is used to output a drive signal corresponding to the first control signal, and input the drive signal to the voltage conversion device through the target resistance.

[0005] The above-mentioned drive control unit also includes a voltage sampling circuit; the voltage sampling circuit is connected to the DC input end of the voltage conversion device and the controller respectively; the voltage sampling circuit is used to collect the port voltage of the DC input end and input the port voltage to the controller.

[0006] The above-mentioned drive control unit also includes a current sampling circuit; the current sampling circuit is respectively connected to the AC output end of the voltage conversion device and the controller; the current sampling circuit is used to collect the port current of the AC output end and input the port current to the controller.

[0007] The above-mentioned resistance control circuit includes multiple resistance branches; the resistance branches include: resistance devices and on-off control devices connected in series; multiple resistance branches are connected in parallel; a controller is connected to the on-off control devices of the resistance branches; the resistance control signal output by the controller controls the connection of the on-off control device in at least one resistance branch.

[0008] The resistance values ​​of the resistors in the above-mentioned different resistor branches are different.

[0009] The on-off control devices in the above-mentioned different resistance branches are connected to different ports of the controller; the resistance control signal includes a connection control signal; and the controller outputs the connection control signal to at least one port.

[0010] The resistance control circuit is connected to the gate of the power device in the voltage conversion device.

[0011] In the second aspect, an embodiment of the present application provides a drive system, which includes an energy storage device, a motor, a voltage conversion device and a drive control unit; the energy storage device and the motor are respectively connected to the voltage conversion device; the energy storage device is used to provide DC power; the drive control unit is used to drive and control the voltage conversion device; the voltage conversion device is used to convert DC power into AC power under the drive control of the drive control unit, and drive the motor to operate through the AC power.

[0012] In a third aspect, an embodiment of the present application provides a drive control method, which is applied to a drive control unit of a voltage conversion device; the drive control unit includes: a controller, a drive circuit and a resistance control circuit; the controller collects operating parameters of the voltage conversion device, and outputs a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; the resistance control circuit turns on a target resistance corresponding to the resistance control signal in the resistance control circuit; wherein the target resistance after conduction is connected between the drive circuit and the voltage conversion device; the target resistance is used to adjust the current change rate of the voltage conversion device; the controller outputs a first control signal of the voltage conversion device to the drive circuit based on the operating parameters; the drive circuit outputs a drive signal corresponding to the first control signal, and inputs the drive signal to the voltage conversion device through the target resistance.

[0013] The above-mentioned controller pre-stores the correspondence between multiple alternative parameters and multiple alternative control signals; the method also includes: the controller queries the resistance control signal corresponding to the operating parameter from the correspondence, and outputs the resistance control signal to the resistance control circuit; wherein the alternative parameters include the operating parameters, and the alternative control signals include the resistance control signal.

[0014] The above-mentioned controller pre-stores the correspondence between multiple parameter segments and multiple alternative control signals; the method also includes: the controller queries the target parameter segment to which the operating parameter belongs from the correspondence, determines the alternative control signal corresponding to the target parameter segment as the resistance control signal, and outputs the resistance control signal to the resistance control circuit.

[0015] The above-mentioned multiple parameter segments include: multiple voltage parameter segments and multiple current parameter segments; the operating parameters include port voltage and port current; the method also includes: the controller queries the target voltage parameter segment to which the port voltage belongs, and the target current parameter segment to which the port current belongs, from the corresponding relationship; the alternative control signal corresponding to the target voltage parameter segment and the target current parameter segment is determined as a resistance control signal, and the resistance control signal is output to the resistance control circuit.

[0016] When the operating parameters include the port voltage, the greater the port voltage, the greater the resistance value of the target resistance corresponding to the resistance control signal; when the operating parameters include the port current, the greater the port current, the greater the resistance value of the target resistance corresponding to the resistance control signal.

[0017] In a fourth aspect, an embodiment of the present application provides an electronic device, including a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the above-mentioned drive control method.

[0018] The above-mentioned drive control unit, drive control method, electronic device and drive system, wherein the drive control unit includes: a controller, a drive circuit and a resistance control circuit; the controller is respectively connected to the voltage conversion device, the drive circuit and the resistance control circuit; the drive circuit is also connected to the resistance control circuit, and the resistance control circuit is also connected to the voltage conversion device; the controller is used to: collect the operating parameters of the voltage conversion device, and output a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; the resistance control circuit is used to: turn on the target resistance corresponding to the resistance control signal in the resistance control circuit; wherein the target resistance after conduction is connected between the drive circuit and the voltage conversion device; the target resistance is used to adjust the current change rate of the voltage conversion device; the controller is also used to: output a first control signal of the voltage conversion device to the drive circuit based on the operating parameters; the drive circuit is used to output a drive signal corresponding to the first control signal, and input the drive signal to the voltage conversion device through the target resistance.

[0019] In the above method, the resistance value of the resistor connected to the voltage conversion device is adjusted according to the operating parameters of the voltage conversion device, and then the current change rate of the voltage conversion device is adjusted. This method can reduce the hardware parameters related to the voltage conversion device and reduce the margin of the hardware parameters, thereby improving the power conversion efficiency of the voltage conversion device, especially improving the power conversion efficiency of the voltage conversion device under normal working conditions.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of a drive control unit of a voltage conversion device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a drive control unit of another voltage conversion device provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of a circuit structure of a resistance control circuit provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the circuit structure of another resistance control circuit provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a drive system provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of another drive system provided in an embodiment of the present application;

[0028] Figure 7 A flowchart of a drive control method provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0031] The electric drive controller is an energy conversion unit that includes a three-phase full-bridge voltage conversion device. By turning on and off the power devices in the voltage conversion device, the frequency and amplitude of the current are regulated, thereby converting the DC power in the energy storage device into three-phase AC power to drive the motor.

[0032] In order to ensure that the voltage conversion device can operate safely under the worst working conditions, the hardware parameters of the voltage conversion device have extremely high safety margins. The parameter margins such as voltage stress, switching speed, and dead time are relatively large, which leads to low power conversion efficiency of the voltage conversion device under normal working conditions.

[0033] Based on this, the embodiments of the present application provide a drive control unit, a drive control method, an electronic device, and a drive system, which can be applied to voltage conversion devices, electric drive controllers, new energy equipment, and the like.

[0034] To facilitate understanding of this embodiment, a driving control unit of a voltage conversion device disclosed in an embodiment of the present application is first described in detail. Figure 1 As shown, the drive control unit includes: a controller 10, a drive circuit 11 and a resistance control circuit 12; the controller is respectively connected to the voltage conversion device, the drive circuit and the resistance control circuit; the drive circuit is also connected to the resistance control circuit, and the resistance control circuit is also connected to the voltage conversion device; the drive control unit is used to drive and control the voltage conversion device, which can convert the DC power in the energy storage device into AC power, and the AC power drives the motor to operate.

[0035] The controller is used to collect operating parameters of the voltage conversion device and output a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current;

[0036] The controller can collect operating parameters through sensors. These operating parameters can include only port voltage, only port current, or both port voltage and port current. The port voltage can be the voltage at the input or output of the voltage conversion device; the port current can be the current at the input or output of the voltage conversion device. The voltage conversion device can specifically be an inverter.

[0037] In a specific example, when the input end of the voltage conversion device is connected to an energy storage device, such as a battery, the operating parameter may include the voltage of the energy storage device, which is the voltage at the input end of the voltage conversion device; the output end of the voltage conversion device outputs AC power, and the operating parameter may include the current of each phase of the three-phase AC power.

[0038] This resistance control signal is used to adjust the resistance of the target resistor connected between the drive circuit and the voltage conversion device. The controller can pre-set and store the corresponding relationship between the operating parameters and the resistor values. After collecting the operating parameters, the controller can query this relationship to obtain the resistor value corresponding to the collected operating parameters, and then generate a resistance control signal for the target resistor corresponding to the resistor value. This resistance control signal can control the target resistor to conduct electricity between the drive circuit and the voltage conversion device.

[0039] In this embodiment, by adjusting the resistance of the resistor between the driving circuit and the voltage conversion device, the hardware parameters related to the voltage conversion device under normal operating conditions can be reduced, the safety margin of the parameters can be reduced, and the power conversion efficiency of the voltage conversion device under normal operating conditions can be improved.

[0040] In this embodiment, the target resistance can be specifically connected to the gate resistor of a power device in the voltage conversion device. That is, the resistance control circuit is connected to the gate of the power device in the voltage conversion device and improves the power conversion efficiency of the voltage conversion device by adjusting the resistance value of the gate resistor of the power device.

[0041] The resistance control circuit is configured to: turn on a target resistance corresponding to a resistance control signal in the resistance control circuit; wherein the turned-on target resistance is connected between the drive circuit and the voltage conversion device; and the target resistance is used to adjust the current change rate of the voltage conversion device. Specifically, the target resistance is used to adjust the current change rate of the power device in the voltage conversion device.

[0042] The resistance control circuit can adjust the resistance value between the drive circuit and the voltage conversion device. The resistance value of the target resistor can change in real time based on the operating parameters of the voltage conversion device. The resistance control circuit can include multiple resistors, and a resistance control signal can control which of the multiple resistors are connected between the drive circuit and the voltage conversion device, as well as the series and parallel connection relationship of the resistors, thereby adjusting the resistance value of the target resistor. In the resistance control circuit, the resistor connected between the drive circuit and the voltage conversion device is the target resistor.

[0043] The controller is further configured to output a first control signal for the voltage conversion device to the drive circuit based on operating parameters. The controller performs a closed-loop control operation based on the operating parameters to generate the first control signal, wherein the port voltage in the operating parameters is subjected to a voltage loop control operation, and the port current is subjected to a current loop control operation. Based on the results of the voltage loop control operation and the current loop control operation, the controller outputs a PWM (Pulse Width Modulation) signal, i.e., the first control signal. This first control signal is used to control the on / off of the power device of the voltage conversion device.

[0044] The driving circuit is used to output a driving signal corresponding to the first control signal, and input the driving signal to the voltage conversion device through the target resistor.

[0045] The current change rate of the voltage conversion device is negatively correlated with the resistance value of the target resistor. After the target resistor is connected between the drive circuit and the voltage conversion device, the first control signal is input to the voltage conversion device through the target resistor to control the on and off of the power device in the voltage conversion device.

[0046] The above-mentioned drive control unit includes a controller, a drive circuit and a resistance control circuit; the controller is respectively connected to the voltage conversion device, the drive circuit and the resistance control circuit; the drive circuit is also connected to the resistance control circuit, and the resistance control circuit is also connected to the voltage conversion device; the controller is used to: collect the operating parameters of the voltage conversion device, and output a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; the resistance control circuit is used to: turn on the target resistance corresponding to the resistance control signal in the resistance control circuit; wherein the target resistance after conduction is connected between the drive circuit and the voltage conversion device; the controller is also used to: output a first control signal of the voltage conversion device to the drive circuit based on the operating parameters; the drive circuit is used to output a drive signal corresponding to the first control signal, and after adjusting the current change rate of the voltage conversion device through the target resistance, the adjusted drive signal is input to the voltage conversion device.

[0047] In the above method, the resistance value of the resistor connected to the voltage conversion device is adjusted according to the operating parameters of the voltage conversion device, and then the current change rate of the voltage conversion device is adjusted. This method can reduce the hardware parameters related to the voltage conversion device and reduce the margin of the hardware parameters, thereby improving the power conversion efficiency of the voltage conversion device, especially improving the power conversion efficiency of the voltage conversion device under normal working conditions.

[0048] In a specific implementation, Figure 2 The above-mentioned drive control unit also includes a voltage sampling circuit 20; the voltage sampling circuit is respectively connected to the DC input end of the voltage conversion device and the controller; the voltage sampling circuit is used to collect the port voltage of the DC input end and input the port voltage to the controller.

[0049] The voltage sampling circuit can specifically be a voltage sensor, or other devices or circuits with a voltage sampling function. When the DC input terminal of the voltage conversion device is connected to the energy storage device, the voltage sampling circuit can also sample the output terminal of the energy storage device. The voltage at the output terminal of the energy storage device is the same as or similar to the port voltage of the DC input terminal of the voltage conversion device.

[0050] The driving control unit further includes a current sampling circuit 21 ; the current sampling circuit is connected to the AC output terminal of the voltage conversion device and the controller respectively; the current sampling circuit is used to collect the port current of the AC output terminal and input the port current to the controller.

[0051] The current sampling circuit can specifically be a current sensor, or other devices or circuits with current sampling function; the AC output end of the voltage conversion device includes a three-phase line, each phase line outputs one phase of three-phase AC power, and the current sampling circuit collects the current in each phase line.

[0052] Figure 3 A circuit structure of a resistance control circuit is provided. The resistance control circuit includes multiple resistance branches, each of which includes a resistance device and an on / off control device connected in series. The multiple resistance branches are connected in parallel, and one end of the multiple parallel resistance branches is connected to a drive circuit and the other end is connected to a voltage conversion device.

[0053] The controller is connected to the on-off control devices of the resistance branches; the resistance control signal output by the controller controls the connection of the on-off control device in at least one resistance branch. The resistance devices in the resistance branch where the connected on-off control device is located are connected between the drive circuit and the voltage conversion device; the resistance control signal can control the connection of one or more on-off control devices.

[0054] In one embodiment, the resistance values ​​of the resistors in different resistor branches are different, and the resistance control signal can control one of the on-off control devices to be connected. In this case, only one resistor is connected between the driving circuit and the voltage conversion device.

[0055] In the above method, resistor devices with different resistance values ​​are set in the resistance control circuit. According to the collected operating parameters, one of the resistor devices is determined to be turned on, which can meet the resistance value requirement of the aforementioned resistance control signal. The circuit topology structure of the resistance control circuit is simple and the resistance control is more efficient.

[0056] The resistance values ​​of the resistors in different resistance branches can also be the same, partially the same, or different. In this case, the resistance control signal can simultaneously control the connection of one or more on-off control devices, adjusting the resistance value by connecting one or more resistors in parallel. This method can adjust the resistance range of the target resistor and provide more selectable resistance values.

[0057] Figure 4 The circuit structure of another resistance control circuit is shown. The on-off control devices in different resistance branches are connected to different ports of the controller; the resistance control signal includes a connection control signal; the controller outputs the connection control signal to at least one port. Figure 4In the example, the resistance control circuit includes six resistance branches. The on / off control devices in the resistance branches are specifically analog switches, but can also be other switching devices such as relays. The analog switches include inputs and outputs. The inputs are connected to the corresponding resistance devices, and the outputs are connected to the gates of the power devices in the voltage conversion device.

[0058] The on-off control device of each resistor branch is connected to a port of the controller. The controller has a total of six ports connected to the on-off control devices. The controller determines which port to send the connection control signal based on the aforementioned operating parameters, and the on-off control device connected to that port is connected.

[0059] like Figure 5 In this embodiment, a driving system is also provided, which includes an energy storage device 50, a motor 51, a voltage conversion device 52 and a driving control unit 53; the energy storage device and the motor are respectively connected to the voltage conversion device; the energy storage device is used to provide DC power; the driving control unit is used to drive and control the voltage conversion device; the voltage conversion device is used to convert DC power into AC power under the driving control of the driving control unit, and drive the motor to operate through the AC power.

[0060] like Figure 6 In this embodiment, another driving system is provided, wherein the energy storage device is a battery, one end of the voltage conversion device is connected to the battery, and the other end is connected to the motor. The voltage sampling circuit collects the voltage V at both ends of the battery. BAT The voltage across the battery is the DC voltage at the input end of the voltage conversion device; the current sampling circuit collects the currents of the three-phase lines at the output end of the voltage conversion device, which are Iu, Iv and Iw respectively.

[0061] The controller is divided into multiple software logic modules according to their functions. Among them, the conditioning and control 1 module conditions and controls the port voltage sampled by the voltage sampling circuit, and then inputs the conditioned and controlled port voltage into the PWM (Pulsewidth modulation) module; the drive switching trigger 1 module generates a resistance control signal INH1 according to the port voltage, and the resistance control signal INH1 is input into the resistance control circuit 1.

[0062] The conditioning and control module 2 conditions and controls the port current sampled by the current sampling circuit, and then inputs the conditioned and controlled port current into the PWM module; the drive switching trigger 2 module generates a resistance control signal INH2 according to the port current, and the resistance control signal INH2 is input into the resistance control circuit 2.

[0063] The PWM module is used to generate a first control signal according to the port voltage and the port current. Figure 6The voltage conversion device includes six power devices. The first control signal includes six signals, which are respectively represented as UH, UL, VH, VL, WH and WL. These first control signals are input to the drive circuit. The drive circuit boosts and amplifies the first control signals to generate drive signals. The six drive signals are respectively represented as G UH , G UL , G VH , G VL , G WH and G WL , each driving signal is input to the corresponding power device.

[0064] In this embodiment, the controller includes a drive switching trigger 1 module and a drive switching trigger 2 module, which correspond to the resistance control circuit 1 and the resistance control circuit 2 respectively; in actual implementation, the controller can control the drive switching trigger 1 module and the drive switching trigger 2 module to work at the same time, or can only control one of the modules to work; accordingly, if the drive switching trigger 1 module is working, the resistance control circuit 1 is connected between the controller and the drive circuit, and if the drive switching trigger 2 module is working, the resistance control circuit 2 is connected between the controller and the drive circuit; if the drive switching trigger 1 module and the drive switching trigger 2 module are working at the same time, the resistance control circuit 1 and the resistance control circuit 2 are both connected between the controller and the drive circuit, and the resistance control circuit 1 and the resistance control circuit 2 jointly affect the gate resistance of the power device in the voltage conversion device.

[0065] The above-mentioned controller also includes a dead zone module, which inputs the conditioned and controlled port current and outputs a delay signal, which is used to control the delay of the drive signal of the power device in the same bridge arm of the voltage conversion device to prevent the power device in the same bridge arm from being directly connected, causing the power device to fail.

[0066] The drive system provided in the embodiment of the present application has the same technical features as the drive control unit provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0067] See also Figure 7 A drive control method is shown, which is applied to a drive control unit of a voltage conversion device; the drive control unit includes: a controller, a drive circuit and a resistance control circuit; the method includes the following steps:

[0068] Step S702: The controller collects operating parameters of the voltage conversion device and outputs a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current;

[0069] Step S704: The resistance control circuit turns on a target resistance corresponding to the resistance control signal in the resistance control circuit; wherein the turned-on target resistance is connected between the driving circuit and the voltage conversion device; the target resistance is used to adjust the current change rate of the voltage conversion device;

[0070] Step S706 , the controller outputs a first control signal of the voltage conversion device to the driving circuit based on the operating parameters;

[0071] In step S708 , the driving circuit outputs a driving signal corresponding to the first control signal, and inputs the driving signal to the voltage conversion device through the target resistor.

[0072] The above-mentioned drive control method is applied to a drive control unit of a voltage conversion device; the drive control unit includes: a controller, a drive circuit and a resistance control circuit; the controller collects operating parameters of the voltage conversion device and outputs a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; the resistance control circuit turns on a target resistance in the resistance control circuit corresponding to the resistance control signal; wherein the target resistance after conduction is connected between the drive circuit and the voltage conversion device; the target resistance is used to adjust the current change rate of the voltage conversion device; the controller outputs a first control signal of the voltage conversion device to the drive circuit based on the operating parameters; the drive circuit outputs a drive signal corresponding to the first control signal, and inputs the drive signal to the voltage conversion device through the target resistance.

[0073] In the above method, the resistance value of the resistor connected to the voltage conversion device is adjusted according to the operating parameters of the voltage conversion device, and then the current change rate of the voltage conversion device is adjusted. This method can reduce the hardware parameters related to the voltage conversion device and reduce the margin of the hardware parameters, thereby improving the power conversion efficiency of the voltage conversion device, especially improving the power conversion efficiency of the voltage conversion device under normal working conditions.

[0074] When determining the hardware parameters of the voltage conversion device, it is necessary to ensure that the voltage spike of the power device does not exceed the withstand voltage of the power device, as expressed in the following formula (1):

[0075] Vdc+Ls*di / dt≤Vces (1)

[0076] Where Vdc is the output voltage of the battery, i.e., the input voltage of the voltage conversion device, Ls is the parasitic parameter of the power circuit in the voltage conversion device, di / dt is the current change rate of the power device at the time of shutdown, and Vces is the withstand voltage of the power device. During debugging, the maximum output voltage of the battery is generally used for testing. In order to satisfy the above formula (1), di / dt must satisfy the following formula (2):

[0077] di / dt≤(Vces-Vdcmax) / Ls (2)

[0078] Since di / dt is negatively correlated with the gate resistance Rg of the power device, in order to satisfy the above formula (2) at the maximum output voltage of the battery, the resistance value of Rg is very large; a large resistance value of Rg will cause the switching of the power device to slow down, increase the switching loss, and lead to low power conversion efficiency of the voltage conversion device.

[0079] In actual operation, the battery operates near the rated voltage most of the time. At this time, the actual voltage of the power device is much lower than the withstand voltage, and there is a large margin. Therefore, under normal operating conditions, the resistance value of Rg can be reduced to improve the power conversion efficiency of the voltage conversion device.

[0080] Since there is a positive correlation between the output current and di / dt of the voltage conversion device, when determining the gate resistance Rg, it is also necessary to ensure that the above formula (2) is satisfied under the condition of maximum output current. In fact, the output current of the voltage conversion device is much smaller than the maximum output current most of the time. Therefore, the resistance value of Rg determined based on the maximum output current of the voltage conversion device is also very large. Therefore, under normal operating conditions, the power conversion efficiency of the voltage conversion device can be improved by reducing the resistance value of Rg.

[0081] In one implementation, the controller pre-stores a correspondence between multiple alternative parameters and multiple alternative control signals; the controller queries the resistance control signal corresponding to the operating parameter from the correspondence, and outputs the resistance control signal to the resistance control circuit; wherein the alternative parameters include the operating parameters, and the alternative control signals include the resistance control signal.

[0082] The alternative parameters may include alternative current parameters and alternative voltage parameters, etc.; the alternative parameters can be understood as all possible operating parameters of the voltage conversion device under various working conditions; each alternative parameter corresponds to an alternative control signal; in actual implementation, the resistance value of the target resistor connected to the voltage conversion device under each alternative parameter can be determined in advance, and the corresponding alternative control signal can be set according to the resistance value; it can be understood that for each alternative parameter, the alternative control signal corresponding to the alternative parameter can control the resistance value of the target resistor corresponding to the alternative parameter connected to the resistance control circuit.

[0083] After the controller obtains the real-time collected operating parameters, the operating parameters are included in the aforementioned multiple alternative parameters, that is, the operating parameter is one of the multiple alternative parameters. The alternative control signal corresponding to the operating parameter, that is, the resistance control signal, can be queried from the aforementioned corresponding relationship.

[0084] In another method, the controller pre-saves the correspondence between multiple parameter segments and multiple alternative control signals; the controller queries the target parameter segment to which the operating parameter belongs from the correspondence, determines the alternative control signal corresponding to the target parameter segment as the resistance control signal, and outputs the resistance control signal to the resistance control circuit.

[0085] When the voltage conversion device has a large number of possible operating parameters under various working conditions, the corresponding relationship between the parameters and the control signal can be set by setting parameter segments. The parameter segment can be understood as a parameter range, and the parameter segment can specifically be a current parameter segment or a voltage parameter segment.

[0086] In actual implementation, the resistance value of the target resistor connected to the voltage conversion device under each parameter segment can be determined in advance, and the corresponding alternative control signal can be set according to the resistance value; it can be understood that for each parameter segment, the alternative control signal of the parameter segment can control the resistance value of the target resistor corresponding to the parameter segment connected to the resistance control circuit.

[0087] After the controller obtains the real-time collected operating parameters, the operating parameters belong to one of the parameter segments, and the candidate control signal corresponding to the target parameter segment to which the operating parameters belong is the resistance control signal.

[0088] Specifically, the above-mentioned multiple parameter segments include: multiple voltage parameter segments and multiple current parameter segments; the operating parameters include port voltage and port current; the controller queries the target voltage parameter segment to which the port voltage belongs, and the target current parameter segment to which the port current belongs from the corresponding relationship; the alternative control signal corresponding to the target voltage parameter segment and the target current parameter segment is determined as a resistance control signal, and the resistance control signal is output to the resistance control circuit.

[0089] The above-mentioned voltage parameter ranges and current parameter ranges can be obtained by parameter debugging of the voltage conversion device. In one example, the voltage parameter range includes two ranges: less than or equal to V1, and greater than V1 and less than or equal to V2. For example, V1 can be 350V and V2 can be 450V. The current parameter range includes three ranges: less than or equal to I1, greater than I1 and less than or equal to I2, and greater than I2 and less than or equal to I3. For example, I1 can be 100A, I2 can be 200A, and I3 can be 300A.

[0090] Table 1 below shows the corresponding relationship between voltage parameter segments, current parameter segments and resistance values.

[0091] Table 1

[0092]

[0093] When the above-mentioned operating parameters include port voltage and port current, the target voltage parameter segment to which the port voltage belongs and the target current parameter segment to which the port current belongs are queried respectively; for example, the target voltage parameter segment to which the port voltage belongs is "less than or equal to V1", and the port voltage corresponds to three resistance values, namely R11, R21, and R31; the target current parameter segment to which the port current belongs is "less than or equal to V1", and the port current corresponds to three resistance values, namely R11 and R12; the resistance value corresponding to both the target voltage parameter segment and the target current parameter segment is R11, and then a resistance control signal corresponding to the resistance value R11 is generated.

[0094] It can be understood that when the operating parameters include port voltage, the greater the port voltage, the greater the resistance of the target resistance corresponding to the resistance control signal; when the operating parameters include port current, the greater the port current, the greater the resistance of the target resistance corresponding to the resistance control signal.

[0095] When the resistance value needs to be switched, the controller can pre-set the anti-shake time window. For example, after the next mode is stable for 5 sampling cycles, the resistance control signal is generated to switch the Rg resistance value to prevent the fluctuation or interference of the sampling signal from affecting the mode switching.

[0096] In the above method, the optimal gate resistance value under different operating parameters of the voltage conversion device is pre-calibrated. While meeting the safe operation requirements, the switching loss of the voltage conversion device is reduced by reducing the resistance value of the gate resistance and increasing the switching speed of the power device, thereby achieving the purpose of improving the power conversion efficiency.

[0097] In actual implementation, the gate resistor value can be adjusted based solely on the voltage at the voltage converter's port, based solely on the current at the voltage converter's port, or based on both the voltage and current at the port. During operation of the voltage converter, based on collected operating parameters, the gate resistors of the power devices within the voltage converter are dynamically adjusted under different operating conditions, thereby improving the power conversion efficiency under different operating conditions.

[0098] This embodiment further provides an electronic device, including a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the above-mentioned drive control method. The electronic device can be a server or a terminal device.

[0099] See also Figure 8 As shown, the electronic device includes a processor 100 and a memory 101 . The memory 101 stores computer-executable instructions that can be executed by the processor 100 . The processor 100 executes the computer-executable instructions to implement the above-mentioned drive control method.

[0100] Furthermore, Figure 8 The electronic device shown further includes a bus 102 and a communication interface 103 , and the processor 100 , the communication interface 103 and the memory 101 are connected via the bus 102 .

[0101] The memory 101 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is achieved through at least one communication interface 103 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 102 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0102] The processor 100 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 100 or software instructions. The above processor 100 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as a random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or register. The storage medium is located in the memory 101. The processor 100 reads the information in the memory 101 and, in conjunction with its hardware, completes the steps of the method of the aforementioned embodiment.

[0103] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0104] In addition, in the description of the embodiments of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0105] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0106] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0107] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art who is familiar with the technical field can still modify the technical solutions described in the above embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A drive control unit, characterized in that: The driving control unit includes: a controller, a driving circuit and a resistance control circuit; The controller is respectively connected to the voltage conversion device, the drive circuit and the resistance control circuit; the drive circuit is also connected to the resistance control circuit, and the resistance control circuit is also connected to the voltage conversion device; The controller is configured to: collect operating parameters of the voltage conversion device, and output a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; The resistance control circuit is used to: turn on a target resistance in the resistance control circuit corresponding to the resistance control signal; wherein the turned-on target resistance is connected between the drive circuit and the voltage conversion device; and the target resistance is used to adjust the current change rate of the voltage conversion device; The controller is further configured to: output a first control signal of the voltage conversion device to the drive circuit based on the operating parameter; The driving circuit is configured to output a driving signal corresponding to the first control signal, and input the driving signal into the voltage conversion device through the target resistor.

2. The drive control unit according to claim 1, characterized in that: The driving control unit further includes a voltage sampling circuit; The voltage sampling circuit is respectively connected to the DC input terminal of the voltage conversion device and the controller; The voltage sampling circuit is used to collect the port voltage of the DC input end and input the port voltage into the controller.

3. The drive control unit according to claim 1, characterized in that: The driving control unit further includes a current sampling circuit; The current sampling circuit is connected to the AC output end of the voltage conversion device and the controller respectively; The current sampling circuit is used to collect the port current of the AC output end and input the port current into the controller.

4. The drive control unit according to claim 1, characterized in that: The resistance control circuit includes a plurality of resistance branches; the resistance branches include: a resistance device and an on-off control device connected in series; the plurality of resistance branches are connected in parallel; The controller is connected to an on-off control device of the resistance branch; The resistance control signal output by the controller controls the on-off control device in at least one of the resistance branches to be connected.

5. The drive control unit according to claim 4, characterized in that: The resistance values ​​of the resistors in different resistor branches are different.

6. The drive control unit according to claim 4, characterized in that: The on-off control devices in different resistance branches are connected to different ports of the controller; the resistance control signal includes a connection control signal; The controller outputs the connection control signal to at least one port.

7. The drive control unit according to claim 1, characterized in that: The resistance control circuit is connected to the gate of the power device in the voltage conversion device.

8. A drive system, characterized in that: The drive system comprises an energy storage device, a motor, a voltage conversion device and a drive control unit according to any one of claims 1 to 7; The energy storage device and the motor are respectively connected to the voltage conversion device; The energy storage device is used to provide direct current power; The driving control unit is used to drive and control the voltage conversion device; The voltage conversion device is used to convert the DC power into AC power under the driving control of the driving control unit, and drive the motor to operate through the AC power.

9. A drive control method, characterized in that: The method is applied to a driving control unit of a voltage conversion device; The driving control unit includes: a controller, a driving circuit and a resistance control circuit; the method includes: The controller collects operating parameters of the voltage conversion device and outputs a resistance control signal to the resistance control circuit based on the operating parameters; wherein the operating parameters include: port voltage and / or port current; The resistance control circuit turns on a target resistance in the resistance control circuit corresponding to the resistance control signal; wherein the turned-on target resistance is connected between the drive circuit and the voltage conversion device; and the target resistance is used to adjust the current change rate of the voltage conversion device; The controller outputs a first control signal of the voltage conversion device to the driving circuit based on the operating parameter; The driving circuit outputs a driving signal corresponding to the first control signal, and inputs the driving signal into the voltage conversion device through the target resistor.

10. The driving control method according to claim 9, characterized in that: The controller pre-stores a correspondence between a plurality of candidate parameters and a plurality of candidate control signals; the method further includes: The controller queries the resistance control signal corresponding to the operating parameter from the corresponding relationship and outputs the resistance control signal to the resistance control circuit; wherein the alternative parameters include the operating parameter, and the alternative control signal includes the resistance control signal.

11. The driving control method according to claim 9, characterized in that: The controller pre-stores a correspondence between a plurality of parameter segments and a plurality of alternative control signals; the method further includes: The controller queries the target parameter segment to which the operating parameter belongs from the corresponding relationship, determines the candidate control signal corresponding to the target parameter segment as the resistance control signal, and outputs the resistance control signal to the resistance control circuit.

12. The driving control method according to claim 11, characterized in that: The plurality of parameter segments include: a plurality of voltage parameter segments and a plurality of current parameter segments; the operating parameters include port voltage and port current; the method further includes: The controller queries the target voltage parameter segment to which the port voltage belongs and the target current parameter segment to which the port current belongs from the corresponding relationship; The candidate control signal corresponding to both the target voltage parameter segment and the target current parameter segment is determined as a resistance control signal, and the resistance control signal is output to a resistance control circuit.

13. The driving control method according to claim 9, characterized in that: When the operating parameter includes a port voltage, the greater the port voltage is, the greater the resistance value of the target resistance corresponding to the resistance control signal is; When the operating parameter includes a port current, the greater the port current is, the greater the resistance value of the target resistance corresponding to the resistance control signal is.

14. An electronic device, characterized in that: The invention comprises a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the drive control method according to any one of claims 9 to 13.

Images