Motor control and series pass regulated B6+3 bridge in integrated starter generator applications
阅读说明:本技术 集成启动发电机应用中的电机控制和串联通过调节的b6+3桥 (Motor control and series pass regulated B6+3 bridge in integrated starter generator applications ) 是由 R·R·尤贾勒 于 2019-08-21 设计创作,主要内容包括:本公开涉及集成启动发电机应用中的电机控制和串联通过调节的B6+3桥。本公开描述了一种用于管理针对集成电机发电机(IMG)(诸如集成启动发电机(ISG)系统)的能量流的控制电路。当IMG以发电机模式操作时,该电路调节IMG的输出电压。该电路包括用于与针对相位的半桥电路反串联连接的每个相的附加开关,例如,附加开关的漏极连接到高侧开关的漏极。当ISG处于发电机模式时,控制附加开关,例如,以在ISG的整个速度范围内(即,高rpm和低rpm)以恒定电压和电流对电池充电。在发电机模式下,可以断开高侧开关,这将高侧开关配置为用作二极管并且当相电压较低时阻止电池放电以实现低rpm操作。(The present disclosure relates to motor control and series pass regulated B6+3 bridge in integrated starter generator applications. The present disclosure describes a control circuit for managing energy flow for an Integrated Motor Generator (IMG), such as an Integrated Starter Generator (ISG) system. The circuit regulates the output voltage of the IMG when the IMG is operating in a generator mode. The circuit comprises an additional switch for each phase connected anti-series with the half-bridge circuit for the phase, e.g. the drain of the additional switch is connected to the drain of the high-side switch. When the ISG is in generator mode, the additional switch is controlled, for example, to charge the battery at constant voltage and current over the entire speed range of the ISG (i.e., high and low rpm). In the generator mode, the high-side switch may be turned off, which configures the high-side switch to act as a diode and prevents the battery from discharging to achieve low rpm operation when the phase voltage is low.)
1. A control circuit for an integrated motor generator, the circuit comprising:
a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal; and
a switch drive circuit comprising a first gate control output terminal, a second gate control output terminal, and a third gate control output terminal, wherein:
the first gate control output is electrically connected to the gate terminal of the switch,
the second gate control output terminal is configured to control a gate terminal of a high-side switch of a half-bridge circuit, an
The third gate control output terminal is configured to control a gate terminal of a low side switch of a half bridge circuit; and
wherein the first terminal of the switch is connected to the high-side switch on a side of the high-side switch opposite a switching node of the half-bridge circuit.
2. The circuit of claim 1, wherein the current path of the switch is connected to a current path of the high-side switch such that a cathode of a body diode of the switch is connected to the same node as a cathode of a body diode of the high-side switch.
3. The circuit of claim 1, wherein the first terminal of the switch is a drain of the switch, and the drain of the switch is connected to a drain of the high-side switch.
4. The circuit of claim 1, wherein the switch is a first switch, the circuit further comprising a second switch and a third switch, wherein:
a first terminal of the second switch is connected to a current path of a second high-side switch,
the first terminal of the third switch is connected to the current path of the third high-side switch.
5. The circuit of claim 1, further comprising a charge pump circuit, wherein the charge pump circuit is configured to provide a voltage to at least the first gate control output terminal.
6. The circuit of claim 5, wherein the switch drive circuit is a first switch drive circuit, the circuit further comprising a second switch drive circuit configured to:
receiving a voltage from the charge pump circuit;
outputting the first gate control output to the gate terminal of the switch.
7. The circuit of claim 1, wherein the circuit is configured to regulate an output voltage of the integrated motor generator while the integrated motor generator is operating in a generator mode.
8. The circuit of claim 7, wherein the circuit is configured to regulate the output voltage of the integrated motor generator to charge a battery.
9. The circuit of claim 7, wherein the circuit is configured to regulate the output voltage and output current by controlling a conduction angle of the switch.
10. The circuit of claim 9, wherein timing for controlling the conduction angle of a switch is adjusted such that the switch opens when a phase voltage for the integrated motor generator approaches a battery voltage such that the phase voltage avoids inducing a phase flyback voltage.
11. The circuit of claim 9, wherein the circuit is configured to:
turning off the half-bridge circuit high-side switch and turning off the half-bridge circuit low-side switch; and
adjusting the output voltage of the integrated motor generator by controlling the on-time of the switch.
12. The circuit of claim 1, wherein the circuit is configured to turn on the switch while the integrated motor generator is operating in a motor mode.
13. A system, comprising:
an integrated motor generator configured to operate in a motor mode and in a generator mode;
a half-bridge circuit comprising a high-side switch coupled to a low-side switch, wherein the half-bridge circuit:
coupled to the integrated motor generator at a switching node of the half-bridge circuit; and
configured to control operation of the integrated motor generator; a control circuit, comprising:
a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal;
a switch drive circuit comprising a control input, a first gate control output terminal, a second gate control output terminal, and a third gate control output terminal, wherein:
the first gate control output is electrically connected to the gate terminal of the switch,
the second gate control output terminal is configured to control a gate terminal of a high-side switch of the half-bridge circuit,
the third gate control output terminal is configured to control a gate terminal of a low side switch of the half bridge circuit,
the first terminal of the switch is connected to a current path of the high-side switch on a side of the high-side switch opposite the switching node of the half-bridge circuit; and
processing circuitry operably coupled to the half-bridge circuit and the control circuit and configured to receive sense signals from the half-bridge circuit and the integrated motor generator.
14. The system of claim 13, wherein the current path of the switch is connected to the current path of the high-side switch such that a cathode of a body diode of the switch is connected to the same node as a cathode of a body diode of the high-side switch.
15. The system of claim 13, wherein the first terminal of the switch is a drain of the switch, and the drain of the switch is connected to a drain of the high-side switch.
16. The system of claim 13, wherein the switch is a first switch, the circuit further comprising a second switch and a third switch, wherein:
a first terminal of the second switch is connected to a current path of a second high-side switch,
the first terminal of the third switch is connected to the current path of the third high-side switch.
17. The system of claim 13, wherein while the integrated motor generator is operating in a generator mode, the circuitry is configured to:
turning off the half-bridge circuit high-side switch and turning off the half-bridge circuit low-side switch;
adjusting the output voltage of the integrated motor generator by controlling the on-time of the switch.
18. The system of claim 17, wherein the circuitry is configured to regulate the output voltage of the integrated motor generator to charge a battery.
19. A method of regulating an output voltage of an integrated motor generator, the method comprising:
turning off each respective high-side switch and each respective low-side switch of one or more half-bridge circuits, wherein the one or more half-bridge circuits are configured to control the integrated motor generator while the integrated motor generator is operating in a motor mode; and
controlling a conduction time of one or more series-regulated switches while the integrated motor generator is operating in a generator mode, wherein each of the one or more series-regulated switches is connected in anti-series to a respective high-side switch of the one or more half-bridge circuits.
20. The method of claim 19, wherein controlling the on-time of the one or more series regulation switches comprises applying a voltage to a gate of the one or more series regulation switches, wherein the voltage is generated by a charge pump circuit.
Technical Field
The present disclosure relates to motor control circuits.
Background
An Integrated Starter Generator (ISG) may be used to replace the conventional starter system and alternator (generator) of a vehicle, such as an automobile. In some examples, the ISG may allow for greater power generation capability and may be used in an Internal Combustion Engine (ICE) or a Hybrid Electric Vehicle (HEV) that may combine an ICE with an electric drive. The ISG may replace the starter motor by including stator coils of an alternator having a crankshaft directly connected to the ICE, rather than a starter motor having a sliding gear connected to the crankshaft during ICE start-up. While in the motoring mode to start the ICE, the ISG receives energy, for example from a battery.
When the ICE is running on a fuel such as propane or gasoline, the ISG operates in a generator mode to power electrical services in the vehicle and to recharge the battery. In some examples, the ISG may have opposite specifications, such as high starting torque and flux weakening capability over a wide speed range. Some examples of ISGs may be used in vehicles having an automatic idle stop system that stops engine idle when the vehicle (such as an automobile) stops (e.g., at a traffic jam or intersection).
Disclosure of Invention
In general, the present disclosure relates to a control circuit for managing energy flow for an Integrated Motor Generator (IMG), such as an Integrated Starter Generator (ISG) system. The circuit regulates an output voltage of the integrated motor generator when the integrated motor generator is operating in a generator mode. The circuit comprises a switch for each phase connected in anti-series with the half-bridge circuit for the phase. The control circuit also includes switch control circuitry and switch control schemes to operate the control circuit throughout a range of operating conditions, including start-up, low revolutions per minute (rpm), and high rpm operation.
A half bridge for an ISG system may include two switches connected in series. In the example of an n-channel power Field Effect Transistor (FET), a series connection means that the source of the high-side switch is connected to the drain of the low-side switch. The circuit of the present disclosure includes additional switches connected in anti-series to each half-bridge branch. In the n-channel example, anti-series connection means that the drain of the additional n-channel switch is connected to the drain of the high-side switch. When the ISG is in generator mode, the additional switch is controlled, for example by a control circuit or a Motor Control Unit (MCU), to charge the battery at a constant voltage over the entire speed range of the ISG (i.e., high rpm and low rpm). In the generator mode, the high-side switch is open, which configures the high-side switch to act as a diode and prevents battery discharge when the phase voltage is low to achieve low rpm operation. When in the motoring mode, the control circuit may turn on the additional switch and control the high-side and low-side switches to drive the motor using power from the battery or some other power source.
In one example, the present disclosure relates to a control circuit for an integrated motor generator, the circuit comprising: a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal; and a switch driving circuit including a first gate control output terminal, a second gate control output terminal, and a third gate control output terminal. A first gate control output is electrically connected to the gate terminal of the switch, a second gate control output terminal is configured to control the gate terminal of the high-side switch of the half-bridge circuit, and a third gate control output terminal is configured to control the gate terminal of the low-side switch of the half-bridge circuit; and wherein the first terminal of the switch is connected to the high-side switch on a side of the high-side switch opposite to the switching node of the half-bridge circuit.
In another example, the present disclosure is directed to a system comprising; an integrated motor generator configured to operate in a motor mode and in a generator mode; a half-bridge circuit including a high-side switch coupled to a low-side switch. Half-bridge circuit: coupled to the integrated motor generator at a switching node of the half-bridge circuit; and is configured to control operation of the integrated motor generator. The system also includes a control circuit, the control circuit including: a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal; a switch drive circuit comprising a control input, a first gate control output terminal, a second gate control output terminal and a third gate control output terminal. A first gate control output is electrically connected to the gate terminal of the switch, a second gate control output terminal is configured to control the gate terminal of the high-side switch of the half-bridge circuit, and a third gate control output terminal is configured to control the gate terminal of the low-side switch of the half-bridge circuit, the first terminal of the switch being connected to the current path of the high-side switch on a side of the high-side switch opposite to the switching node of the half-bridge circuit. The system also includes processing circuitry operatively coupled to the half-bridge circuit and the control circuit and configured to receive the sensed signals from the half-bridge circuit and the integrated motor generator.
In another example, the present disclosure is directed to a method of regulating an output voltage of an integrated motor generator, the method comprising: each respective high-side switch and each respective low-side switch of the one or more half-bridge circuits are turned off, wherein the one or more half-bridge circuits are configured to control the integrated motor generator while the integrated motor generator is operating in the motor mode. When the integrated motor generator is operating in a generator mode, on-times of one or more series-regulated switches are controlled, wherein each of the one or more series-regulated switches is connected in anti-series to a respective high-side switch of one or more half-bridge circuits.
The details of one or more examples of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the disclosure will be apparent from the description and drawings, and from the claims.
Drawings
FIG. 1 is a schematic diagram showing an example series regulation circuit using SCRs;
FIG. 2 is a schematic diagram showing an example series regulation circuit using a MOSFET and diode configuration;
FIG. 3 is a schematic and block diagram illustrating an example series regulation circuit using an anti-series MOSFET configuration in accordance with one or more techniques of the present disclosure;
FIG. 4 is a schematic and block diagram illustrating an example implementation of a series regulation circuit using an anti-series MOSFET configuration in accordance with one or more techniques of the present disclosure; and
fig. 5 is a flow chart illustrating example operations of a series regulation circuit for an integrated motor generator according to one or more techniques of this disclosure.
Detailed Description
The present disclosure describes a control circuit for managing energy flow of an integrated motor generator, such as an Integrated Starter Generator (ISG) system. The circuit regulates an output voltage of the integrated motor generator when the integrated motor generator is operating in a generator mode. The circuit comprises a switch for each phase connected in anti-series with the half-bridge circuit for the phase. The control circuit also includes switch control circuitry and switch control schemes to operate the control circuit throughout a range of operating conditions, including start-up, low revolutions per minute (rpm), and high rpm operation.
A half-bridge for an Integrated Motor Generator (IMG) may include two switches connected in series for each motor phase. In the example of an n-channel power Field Effect Transistor (FET), a series connection means that the source of the high-side switch is connected to the drain of the low-side switch. The technique of the present disclosure includes additional switches connected in anti-series to each half-bridge leg. Continuing with the n-channel example, the anti-series connection means that the drain of the additional switch is connected to the drain of the high-side switch. For example, a three-phase motor may include three half-bridge branches and three additional switches connected in anti-series with each branch.
In some examples, when in the motoring mode, a control circuit (e.g., a Motor Control Unit (MCU)) turns on an additional switch and controls the high-side and low-side switches to drive the ISG in the motoring mode using power from the battery, such as to start an Internal Combustion Engine (ICE). In an example of a vehicle with an automatic idle stop system, when the vehicle driver releases the brake and depresses the accelerator, the MCU may cause the ISG to draw power from the battery to rotate the ISG and start the ICE in a motor mode. In some examples, the ISG may provide power assistance, such as at increased loads.
When the ISG is in generator mode, the additional switch is controlled, for example by the control circuit or directly by the MCU, to charge the battery at a constant voltage over the entire speed range of the ISG (i.e. high and low rpm). The high-side switch may be turned off, which configures the high-side switch to act as a diode and prevents the battery from discharging to achieve low rpm operation when the phase voltage is low. The low side switch may also be turned off, which results in rectification through the body diode of the low side switch.
In some examples, the MCU may be controlled by aA DC or external interrupt senses each phase zero crossing to manage synchronous negative phase cycle rectification by software. By managing rectification, the MCU or similar circuit can turn on the low side switch during the portion of the cycle when the body diode is conducting. Thus, instead of current flowing through the body diode, current may flow through the transistor current path. R of transistor current pathDS-ONLess power may be consumed than the current through the body diode.
In some examples, an MCU or similar circuit controls voltage and current regulation to charge the battery by controlling the on-time of each additional switch. As the speed of the generator (i.e., Revolutions Per Minute (RPM)) increases, the phase voltage may increase and the MCU may control the on-time of the additional switch. The MCU may determine the on-time by monitoring parameters of the ISG system, such as battery voltage, charging current, switch node voltage for each phase, zero-crossings for each phase, and the like. In some examples, the MCU may receive the monitoring signal via an analog-to-digital converter (ADC) circuit.
The techniques of this disclosure may use series regulation to provide a constant output voltage, because series regulation may be more efficient than shunt regulation for ISG systems. Shunt regulation may allow the use of lower voltage devices, but in ISG applications, shunt regulation may maintain a load on the ICE portion of the ISG system even if there is no load on the engine. Series regulation does not load the engine part of the ISG under no load and therefore may be more efficient than shunt regulation for ISG applications. However, when the motor is used as a generator at high rpm, the generator may output a high voltage at high rpm, in some examples exceeding 50Vrms, which the system may regulate to a lower voltage. The techniques of the present disclosure allow for more efficient series regulation to be used throughout the operating range of the ISG system. The configuration of the anti-series switch with half-bridge branches also provides reverse battery protection due to the anti-series body diode.
Advantages of the techniques and circuit configurations of the present disclosure include reduced power consumption, fewer components, lower cost, and reduced size compared to other techniques. For example, each Silicon Controlled Rectifier (SCR) may have a high voltage drop across the SCR compared to using the SCR for each phase, resulting in high power consumption and possibly requiring a large heat sink to help manage SCR heating, thus possibly resulting in an increase in control circuit size. The use of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and diode combination in series with each phase is another series regulation technique that may result in additional components, higher cost, and larger size circuits.
Fig. 1 is a schematic diagram illustrating an example series regulation circuit using SCRs. The
The
In the example of fig. 1, the
The
Each half-bridge circuit includes a switch node (SW node), which is a node connecting the drain of the high-side transistor to the source of the low-side transistor. In the example of fig. 1, switch node 15 is for a half-bridge circuit including transistors M1 and M4, and switch
The anode of each SCR S1-S3 is connected to each respective switch node. For example, the anode of SCR S1 is connected to switch node 15, the anode of SCR S3 is connected to switch
In operation, the
When the ICE is running, the
The
Fig. 2 is a schematic diagram illustrating an example series regulation circuit using a MOSFET and diode configuration. Elements having the same reference number as those of fig. 2 shown in fig. 1 have the same attributes, connections, and functions. For example,
In contrast to the
Similar to the example of fig. 1, in operation, the
The circuit 20 may have some disadvantages compared to other types of circuits that may regulate the voltage from the
Fig. 3 is a schematic and block diagram illustrating an example series regulation circuit using an anti-series MOSFET configuration in accordance with one or more techniques of this disclosure. Similar to
The
The IMG180 is an integrated motor generator similar to the IMG8 described above with respect to fig. 1 and 2. In the example of fig. 1, the IMG180 may be used for various applications, such as the ISG system described above. In the motoring mode, the speed, torque, and other mechanical outputs of the IMG180 may be controlled by the half-
In some examples, the MCU110, the driver and
Similar to the
In the example of the
In the example of fig. 3, the regulating transistors M9-M11 are n-channel MOSFETs that include a gate terminal, a current channel including a source terminal and a drain terminal, and body diodes D9-D11. The source of each transistor M9-M11 is connected to the positive terminal Vbat +152 of the battery 150, which positive terminal Vbat +152 may also be connected to other electrical loads not shown in FIG. 3. Unlike circuit 20, the drain of each transistor M9-M1 is connected to the drain of a respective high-side transistor (not shown in FIG. 3) of each half-bridge of half-
The
In some examples, the
This technique of adjusting the conduction angle to avoid phase induced flyback voltages may provide advantages over other techniques. For example, using this technique to avoid flyback voltages helps avoid the need for large NMOS sizes, which may result in a reduction in the footprint of the circuit. In examples where a flyback condition is not avoided or eliminated, the circuit may require a high voltage MOSFET with an external buffer or a MOSFET with high repetitive avalanche energy handling capability. Circuits that impose repeated avalanche events on the MOSFETs can cause the circuits to heat up very high, and high heating can cause reliability problems. Avoiding phase-induced flyback voltages may reduce the need for heat dissipation, e.g., using a heat sink, fan, etc., and thus may provide additional advantages in reducing cost and size.
In the example of the
The charge pump portion of the driver and
The
Fig. 4 is a schematic and block diagram illustrating an example implementation of a series regulation circuit using an anti-series MOSFET configuration in accordance with one or more techniques of this disclosure. The
The system depicted by
The half-
By measuring the
The configuration of
An example of the
As described above with respect to fig. 3, the charge pump portion of the driver and
The anode of the
Similar to that described above with respect to fig. 1-3, in operation, the MCU210 of fig. 4 can control the half-
In the generator mode, the driver and
Fig. 5 is a flow chart illustrating example operations of a series regulation circuit for an integrated motor generator according to one or more techniques of this disclosure. The steps of fig. 5 will be described with reference to fig. 3 and 4, unless otherwise noted.
For systems including an IMG, such as an ISG system or a power assist system, the IMG may operate in a motor mode or a generator mode. In the generator mode, the system regulates the output voltage of an IMG, such as IMG180 or IMG280, to provide power, for example, to charge a battery or to provide power to other electrical loads. At low rpm, the IMG may output a low voltage, and in accordance with one or more techniques of the present disclosure, the system is configured to prevent undesired battery discharge while the IMG outputs the low voltage. A control circuit, for example including the driver and
While the IMG280 is operating in the generator mode, the system may control the on-time (92) of one or more series-regulated switches (e.g., M9-M11). The regulating switches (e.g., transistors M9-M11) are connected such that the current path of the switches is anti-series with the high-side transistors of the half-bridge circuit that controls the motor mode IMG. As the rpm of the IMG280 increases, the rms output voltage of the IMG280 also increases. In this configuration, the regulation switches, transistors M9-M1, may control the average current and voltage through the body diodes of the high-side switches (e.g., M201-M203) by changing the conduction time or conduction angle of each regulation switch. In some examples, the MCU110 may control the on-time of the transistors M9-M11 via the driver control signals 112 to the
In one or more examples, the functions described above may be implemented in hardware, software, firmware, or any combination thereof. For example, the various components of FIG. 3 (such as the MCU 110) may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. The computer readable medium may include a computer readable storage medium or memory. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementing the techniques described in this disclosure. By way of example, and not limitation, such computer-readable storage media can comprise RAM, ROM, EEPROM, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The instructions may be executed by processing circuitry, such as one or more DSPs, general purpose microprocessors, ASICs, FPGAs, or other equivalent integrated or discrete logic circuitry. Thus, the term "processor" as used herein may refer to any of the foregoing structure or any other structure suitable for implementing the techniques described herein. In addition, the functions described herein may be provided within dedicated hardware and/or software modules. Furthermore, the techniques may be implemented entirely within one or more circuits or logic elements.
The techniques of this disclosure may be implemented in a wide variety of devices or apparatuses, such as an Integrated Circuit (IC) or a group of ICs (e.g., a chipset). Various components, modules, or units are described in this disclosure to emphasize functional aspects of devices configured to perform the disclosed techniques, but do not necessarily require implementation by different hardware units. Rather, as noted above, the various units may be combined in hardware units, or provided by a set of interoperating hardware units (including one or more processors as noted above) in combination with appropriate software and/or firmware. Other techniques of the present disclosure are described in the following examples.
Example 1. a control circuit for an integrated motor generator, the circuit comprising: a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal; and a switch driving circuit including a first gate control output terminal, a second gate control output terminal, and a third gate control output terminal. The first gate control output is electrically connected to a gate terminal of the switch, the second gate control output terminal is configured to control a gate terminal of the high-side switch of the half-bridge circuit, and the third gate control output terminal is configured to control a gate terminal of the low-side switch of the half-bridge circuit; and wherein the first terminal of the switch is connected to the high-side switch on a side of the high-side switch opposite a switching node of the half-bridge circuit.
Example 2. the control circuit of example 1, wherein the current path of the switch is connected to the current path of the high-side switch such that the cathode of the body diode of the switch and the cathode of the body diode of the high-side switch are connected to the same node.
Example 3. the control circuit of any one or any combination of examples 1-2, wherein the first terminal of the switch is a drain of the switch, and the drain of the switch is connected to the drain of the high-side switch.
Example 4. the control circuit of any combination of examples 1-3, wherein the switch is a first switch, the circuit further comprising a second switch and a third switch, wherein: the first terminal of the second switch is connected to the current path of the second high-side switch and the first terminal of the third switch is connected to the current path of the third high-side switch.
Example 5 the control circuit of any combination of examples 1-4, further comprising a charge pump circuit, wherein the charge pump circuit is configured to provide a voltage to at least the first gate control output terminal.
Example 6 the control circuit of any combination of examples 1-5, wherein the switch drive circuit is a first switch drive circuit, the circuit further comprising a second switch drive circuit configured to: receiving a voltage from the charge pump circuit; outputting a first gate control output to a gate terminal of the switch.
Example 7 the control circuit of any combination of examples 1-6, wherein the circuit is configured to regulate an output voltage of the integrated motor generator while the integrated motor generator is operating in a generator mode.
Example 8 the control circuit of any combination of examples 1-7, wherein the circuit is configured to regulate an output voltage of the integrated motor generator to charge a battery.
Example 9. the control circuit of any combination of examples 1-8, wherein the circuit is configured to regulate the output voltage and output current by controlling a conduction angle of the switch.
Example 10 the control circuit of any combination of examples 1-9, wherein the timing for controlling the conduction angle of the switch is adjusted such that the switch opens when a phase voltage for the integrated motor generator approaches a battery voltage such that the phase voltage avoids inducing a phase flyback voltage.
Example 11 the control circuit of any combination of examples 1-10, wherein the circuit is configured to: turning off the half-bridge circuit high-side switch and turning off the half-bridge circuit low-side switch; and adjusting the output voltage of the integrated motor generator by controlling the on-time of the switch.
Example 12 the control circuit of any combination of examples 1-11, wherein the circuit is configured to turn on the switch while the integrated motor generator is operating in a motor mode.
Example 13. a system, comprising: an integrated motor generator configured to operate in a motor mode and in a generator mode; a half-bridge circuit including a high-side switch coupled to a low-side switch. The half-bridge circuit: a switching node of the half-bridge circuit is coupled to the integrated motor generator; and configured to control operation of the integrated motor generator. The system also includes a control circuit. The control circuit includes: a switch comprising a gate terminal and a current path, the current path comprising a first terminal and a second terminal; a switch drive circuit comprising a control input, a first gate control output terminal, a second gate control output terminal and a third gate control output terminal. The first gate control output is electrically connected to a gate terminal of the switch, the second gate control output terminal is configured to control a gate terminal of a half-bridge circuit high-side switch, the third gate control output terminal is configured to control a gate terminal of a half-bridge circuit low-side switch, the first terminal of the switch is connected to a current path of the high-side switch on a side of the high-side switch opposite a switch node of the half-bridge circuit. The system also includes processing circuitry operatively coupled to the half-bridge circuit and the control circuit and configured to receive sensed signals from the half-bridge circuit and the integrated motor generator.
Example 14. the system of example 13, wherein the current path of the switch is connected to the current path of the high-side switch such that the cathode of the body diode of the switch and the cathode of the body diode of the high-side switch are connected to the same node.
Example 15 the system of any combination of examples 13-14, wherein the first terminal of the switch is a drain of the switch, and the drain of the switch is connected to the drain of the high-side switch.
Example 16 the system of any combination of examples 13-15, wherein the switch is a first switch, the circuit further comprising a second switch and a third switch, wherein: the first terminal of the second switch is connected to the current path of the second high-side switch and the first terminal of the third switch is connected to the current path of the third high-side switch.
Example 17 the system of any combination of examples 13-16, wherein when the integrated motor generator operates in a generator mode, the circuitry is configured to: turning off the half-bridge circuit high-side switch and turning off the half-bridge circuit low-side switch; the output voltage of the integrated motor generator is regulated by controlling the on-time of the switch.
Example 18 the system of any combination of examples 13-17, wherein the circuitry is configured to regulate an output voltage of the integrated motor generator to charge a battery.
Example 19 a method of regulating an output voltage of an integrated motor generator, the method comprising: turning off each respective high-side switch and each respective low-side switch of one or more half-bridge circuits, wherein the one or more half-bridge circuits are configured to control the integrated motor generator while the integrated motor generator is operating in a motor mode. Controlling a conduction time of one or more series-regulated switches while the integrated motor generator is operating in a generator mode, wherein each of the one or more series-regulated switches is connected in anti-series connection to a respective high-side switch of the one or more half-bridge circuits.
Example 20. the method of example 19, wherein controlling the on-time of the one or more series regulation switches comprises applying a voltage to a gate of the one or more series regulation switches, wherein the voltage is generated by a charge pump circuit.
Various examples of the present disclosure have been described. These and other examples are within the scope of the following claims.