2644 results about "Dc converter" patented technology

The invention discloses a wide-temperature-range sodium-lithium hybrid energy storage system and a control method thereof. According to the system, the working temperature range of the energy storage system is effectively expanded through sodium-lithium hybrid energy storage; the sodium ion battery unit bears a low-temperature working condition, and the lithium ion battery unit bears a normal-temperature basic load, so that the low-temperature and power characteristics of a sodium battery and the high-energy density advantage of a lithium battery are exerted, and complementation of energy density and temperature adaptability is realized; and the independent bidirectional DC / DC converter is adopted for power coupling, so that the problem of voltage mismatching possibly caused by direct parallel connection is effectively avoided, and the reliability and the control precision of the system are improved. The system has intelligent environment perception and adaptive control capabilities, can adaptively adjust a working mode and a power distribution strategy according to environment conditions, and is high in intelligent degree. The modular design is adopted, system expansion and maintenance are facilitated, and the operation and maintenance cost is reduced.

The present invention provides a topology, method and system for bi-directional power conversion of excitation power supply for power battery testing, wherein the topology comprises a three-phase PWM (pulse width modulation) converter, a high-frequency isolation three-level LLC (logical link control) resonant converter and a DC-DC (direct current) converter forming a topology structure for a three-stage power conversion; an input end of the three-phase PWM converter is connected to a power grid side; the high-frequency isolation three-level LLC resonant converter is connected between the three-phase PWM converter and the DC-DC converter in series and is configured for realizing bi-directional DC voltage conversion and isolation, and to raise a busbar voltage between the high-frequency isolation three-level LLC resonant converter and the DC-DC converter; and, the DC-DC converter is configured to generate charging and discharging excitation currents for a power battery testing.

The invention relates to the technical field of fuel cell control, and discloses a control method of a hydrogen fuel system controller, which comprises the following steps: in response to a system shutdown instruction, controlling a DC / DC converter to maintain operation and request a preset scavenging current, and consuming residual reaction gas in a flow channel and a pipeline by using an electrochemical power generation reaction in an electric pile; meanwhile, hydrogen-cut air-down operation is executed, and the average single voltage of the electric pile is collected in real time; when it is monitored that the average monomer voltage is reduced to be below a preset anti-corrosion safety threshold value, the DC / DC converter is controlled to be disconnected, and mechanical purging is started. A time sequence interlocking mechanism of electrochemical energy depletion and mechanical purging is established, a high-potential retention path in the shutdown process is blocked from the physical and chemical source, and the safety of the shutdown is improved. Reverse polarity corrosion caused by a hydrogen-air interface effect is avoided, and the service life of the galvanic pile is prolonged.

The invention discloses a three-phase vehicle-mounted charger hierarchical control method and system based on a battery state, and the method comprises the steps: obtaining the battery state data of a vehicle-mounted power battery, the battery state data at least comprising a battery voltage and a battery charge state; determining a charging mode according to the battery voltage and / or the battery charge state; when the charging mode is a first charging mode, controlling the PFC converter to operate in a constant voltage output mode, and executing voltage following control on the bidirectional DC-DC converter based on the battery voltage; and when the charging mode is a second charging mode, executing voltage following control on the PFC converter based on the battery voltage, and controlling the bidirectional DC-DC converter to operate in a constant-frequency or constant-phase output mode at the same time. By setting hierarchical control strategies under different working conditions, the output voltage of the PFC converter is adaptively adjusted, the voltage regulation transformation ratio under different working conditions is optimized, the overall circuit structure is improved, and the charging efficiency of the vehicle-mounted charger within the full working condition range is improved.

The invention discloses a power grid friendly light storage direct current integrated grid-connected control method and device. The method comprises the following steps: acquiring a power grid dispatching instruction, a common connection point voltage / frequency deviation, the maximum power of a photovoltaic unit, the charge state of an energy storage unit and a power limit value in real time; calculating a total active / reactive power target value required to be injected into the power grid by the grid-connected converter based on the power grid dispatching instruction and the common connection point voltage / frequency deviation; generating a photovoltaic power / energy storage power dynamic adjustment coefficient in real time according to the power grid frequency deviation amplitude, the voltage out-of-limit grade and the charge state of the energy storage unit, and decomposing the total active power target value into photovoltaic unit / energy storage unit instruction power; adjusting the direct-current bus voltage based on the total active / reactive power target value in a grid-connected converter control layer to realize a power grid supporting function; in a local unit control layer, photovoltaic unit instruction power is tracked through a photovoltaic unit DC / DC converter, and energy storage unit instruction power is tracked through an energy storage unit bidirectional DC / DC converter.

An electric vehicle charging system comprising a Direct Current (DC) distributor, a site controller, one or more alternating current (AC) / DC rectifiers connected to the DC distributor and the site controller, and an electric vehicle charger having one or more DC / DC converters connected to the DC distributor and a charge controller in communication with the site controller and each of the one or more DC / DC converters. The one or more AC / DC rectifiers are decoupled from the one or more DC / DC converters.

The invention provides an intelligent charging system and method based on illumination intensity adaptive adjustment. The intelligent charging system and method are applied to a photovoltaic energy storage system comprising a photovoltaic cell, a DC-DC converter, a storage battery charging mode control module and a storage battery. The method comprises the following steps: firstly, acquiring current illumination intensity, an incident light angle and a working environment temperature, and sending the current illumination intensity, the incident light angle and the working environment temperature to a photovoltaic cell and storage battery charging mode control module; the photovoltaic cell outputs corresponding voltage and current based on the parameters and a temperature compensation mechanism; and the storage battery charging mode control module converts the output of the photovoltaic battery into charging voltage and current for the storage battery, and dynamically determines a constant-voltage or constant-current charging mode in combination with the illumination intensity, the environment temperature, the incident light angle and the charging parameters, so that the self-adaptive charging of the storage battery is realized. Through multi-parameter cooperative adjustment, the charging mode is accurately matched with the environment condition and the storage battery state, and the charging efficiency and the system stability can be improved.

The invention discloses an isolated high-voltage direct-hanging energy storage converter and energy balance integrated control method. The method comprises the following steps: S1, acquiring SOC and voltage of each battery cluster in an energy storage converter; s2, establishing a controlled energy channel between the battery clusters, and performing self-balancing transfer on energy between the adjacent battery clusters according to voltage and SOC differences between the battery clusters; s3, selecting an expansion phase shift mode according to the power flow direction between the battery clusters, and selecting a phase shift ratio under the constraint of transmission power to reduce current stress and backflow power; s4, generating a modulation coefficient of a shared bridge arm according to decoupling inductive current inner loop proportion tracking; performing PR current closed loop on the main bridge arm, and generating a switching sequence of each switching tube of the shared bridge arm by adopting unipolar carrier phase-shifting modulation; and S5, outputting the modulation coefficient of the shared bridge arm and the switching sequence of each switching tube, driving the isolated bidirectional DC-DC converter and each H-bridge module to work, and realizing grid-connected energy bidirectional flow and voltage and current index satisfaction.

The present disclosure relates to a standby power supply, including: a first sub power supply configured to provide alternating current electrical energy, where the first sub power supply is connected to an input terminal of an alternating current / direct current (AC / DC) converter; the AC / DC converter configured to convert the alternating current electrical energy into direct current electrical energy, where an output terminal of the AC / DC converter is connected to an output terminal of the standby power supply; and second sub power supplies configured to provide the direct current electrical energy, where the second sub power supplies are connected to the output terminal of the standby power supply. Through the present disclosure, a standby power supply solution having high reliability and capable of meeting power consuming requirements of a load with a great change in power demand such as a wind generator may be provided.

The invention relates to an electric engine, a power device and an aircraft, and belongs to the technical field of aircraft power equipment.The electric engine comprises a power motor and a liquid cooling flow path arranged in the power motor and comprises a stator support; the heat dissipation system comprises a fan, a radiator and a heat dissipation motor, an outlet of the radiator is connected with an inlet of the liquid cooling flow path, an inlet of the radiator is communicated with an outlet of the liquid cooling flow path, and the fan is used for cooling the radiator and / or the power motor; the motor rear cover is fixedly connected with the stator bracket; and the two direct-current converters are both mounted on the motor rear cover and are both electrically connected with the heat dissipation motor. The two direct-current converters convert high-voltage direct current accessed by the electric engine into low-voltage direct current capable of being used by the heat dissipation motor, and the electricity utilization requirement of the heat dissipation motor is met. Due to the redundancy design of the two direct-current converters, when one path of low-voltage power supply breaks down, the other path of low-voltage power supply can still supply power to the heat dissipation motor in a low-voltage mode, and enough fault handling time can be provided for the whole power supply system.

The invention discloses a distributed light storage and charging integrated system, which comprises a photovoltaic power generation unit, an energy storage unit, a charging unit, a power grid interface unit, an energy management controller and a direct current bus, the photovoltaic power generation unit comprises a DC / DC converter, and the photovoltaic power generation unit is connected with the DC bus through the DC / DC converter; the energy storage unit comprises a lithium ion battery pack, a flywheel energy storage device, a bidirectional DC converter and a flywheel controller. The lithium ion battery pack and the flywheel energy storage device are connected to the DC bus through the bidirectional DC converter and the flywheel controller respectively. The charging unit comprises at least one direct-current quick charging pile, at least one alternating-current slow charging pile and a DC / AC inverter, the direct-current quick charging pile is directly connected with the direct-current bus, and the alternating-current slow charging pile is connected with the direct-current bus through the DC / AC inverter; the power grid interface unit comprises an AC / DC converter and is connected with the DC bus through the AC / DC converter. According to the invention, through collaborative design of a modular hardware architecture and an intelligent time-sharing strategy, comprehensive improvement of economy, reliability and functionality of the system is realized.

An onboard charging system for an electric vehicle includes a charging port configured to receive a single-phase AC power, a power outlet configured to provide the single-phase AC power to one or more external devices, a single-phase inverter connected to the power outlet and configured to provide power splitting functionality, a DC battery selectively coupled to the charging port, a bidirectional inverter configured to convert AC power to DC power and to convert DC power to AC power, the bidirectional inverter is selectively coupled to the battery, an electric motor coupled to the bidirectional inverter and selectively coupled to the charging port, a DC-AC converter selectively coupled to the electric motor and selectively coupled to the power outlet, and a DC-DC converter coupled to the DC-AC converter and selectively coupled to the battery.

The invention relates to the technical field of power distribution system protection, in particular to a high-safety energy storage system and a fault detection method thereof, the system comprises a measurement and control center, an insulation monitoring device, a bidirectional DC-DC converter and an integrated DC power distribution unit, the insulation monitoring device is connected with a DC power distribution bus, and the ground insulation state of the bus is monitored in real time; the input end of the bidirectional DC-DC converter is connected with the storage battery pack, and the output end is connected with the DC power distribution bus through the integrated DC power distribution unit to construct an electric energy distribution path. The integrated direct current power distribution unit comprises a circuit breaker, two voltage detection modules and two current detection modules, the first voltage detection module is connected with the direct current power distribution bus and the measurement and control center, the second voltage detection module is connected with the circuit breaker and the measurement and control center, and the circuit breaker is connected with the direct current power distribution bus. And the two current detection modules are connected in series between the output end of the bidirectional DC-DC converter and the circuit breaker to form a current detection loop. According to the invention, through multi-level real-time monitoring and centralized control, the safety and fault response capability of the system are significantly improved.

The invention discloses a wind, light and green power coupled pumping unit well group operation collaborative optimization method. The method comprises the following steps: acquiring field data of a multi-energy micro-grid pumping unit well group; establishing a wind and light output uncertainty model, an energy storage battery model, a pumping unit power model and bidirectional AC / DC converter equipment; based on each model, establishing a multi-objective optimization scheduling model for the intermittent pumping operation of the multi-energy micro-grid pumping unit well group; an NSGA-II method is adopted to solve the established multi-objective optimization scheduling model, and a Pareto optimal scheduling scheme is obtained; and carrying out comprehensive evaluation and decision analysis based on an entropy weight TOPSIS method, and selecting an optimal scheme from a Pareto optimal scheduling scheme set obtained by NSGA-II. According to the multi-energy micro-grid rod-pumped well group off-peak interval pumping operation multi-objective optimization method based on NSGA-II and entropy weight TOPSIS, the power utilization requirement of the rod-pumped well group can be met, the working system of rod-pumped well group interval pumping operation is optimized, the economical efficiency and stability of the operation of a rod-pumped well interval pumping system under a wind-solar storage micro-grid are ensured, and the green power consumption capability of the system is enhanced.

The invention discloses a half-bridge three-phase single-stage AC / DC converter and a control method thereof, and belongs to the technical field of electric energy conversion. The half-bridge three-phase single-stage AC / DC converter comprises an AC side switch module, a resonance module, a DC side switch module and a filtering module; a three-phase alternating current, the filtering module, the alternating current side switch module, the resonance module, the direct current side switch module and a direct current are connected in sequence. According to the half-bridge three-phase single-stage AC / DC converter and the control method thereof, bidirectional conversion of energy can be realized, the energy conversion level is reduced, and the overall efficiency and the power density of the converter are improved.

The invention relates to the field of switching power supply management integrated circuits, in particular to a self-adaptive conduction time generating circuit for a BUCK type DC-DC converter, which comprises a charging circuit (1) and a sampling circuit (2), and is characterized in that the charging circuit (1) generates charging current in direct proportion to input voltage through a charging capacitor (C1) and a comparator (OP2), and charges the C1 to obtain first charging voltage; the sampling circuit (2) samples and filters the voltage of the switch node (SW), and outputs a first sampling voltage in direct proportion to the output voltage; and the comparator (OP2) compares the first charging voltage with the first sampling voltage, and outputs a turn-off signal to control the upper power tube to be turned off when the first charging voltage and the first sampling voltage are equal, so that the self-adaptive turn-on time is obtained. By dynamically adjusting the conduction time, the electromagnetic interference in the traditional constant conduction time control is effectively suppressed, the noise immunity and reliability of the system are improved, and meanwhile, the method has the advantages of quick response and high efficiency.

The invention discloses an energy storage converter predictive current control method based on data driving model self-learning, and belongs to the technical field of power electronic converter control. The energy storage converter is a half-bridge bidirectional DC-DC converter, and the method comprises the following steps: collecting the state quantity of the energy storage converter through a sensor in each control period, forming a data driving prediction model constructed by an input vector input neural network online parameter identification module, and outputting an initial duty ratio prediction value; constructing a value function, performing online optimization on an initial value through a gradient descent method to obtain a final optimal duty ratio, and simplifying a scene to directly use the initial value; comparing the optimal duty ratio with a carrier wave to generate a PWM (Pulse Width Modulation) signal to drive a power switch tube; actual inductive current is collected, an ideal duty ratio enabling the value function to be minimum is reversely solved to serve as a supervision signal, and the model weight is trained and updated online through a sample. The technical problem that traditional continuous set model predictive control depends on an accurate mathematical model is solved.

The invention relates to the technical field of power system control, and discloses a photovoltaic energy storage primary frequency modulation cooperative control system based on output prediction and SOC balance, which comprises a photovoltaic array unit, a photovoltaic inverter, a sodium ion super capacitor energy storage unit, a bidirectional DC / DC converter and a cooperative controller. The cooperative controller is configured to identify an output trend by using photovoltaic power prediction data, and dynamically adjust an energy storage SOC reference anchor value; a source storage virtual impedance model considering the real-time efficiency characteristic of the sodium ion super capacitor is constructed, and the primary frequency modulation power demand is dynamically allocated. When the state of the energy storage unit deteriorates, the power compensation amount is calculated through photovoltaic load shedding sliding mode offset control, and the closed-loop target of the photovoltaic inverter is corrected to share the frequency modulation task. And after the frequency modulation is finished, controlling the photovoltaic power to recover by adopting an asymmetric step length. The method solves the problems that the energy storage standby is not matched and the response capability is reduced under the extreme working condition, and improves the frequency modulation stability of the system.

The invention discloses a light-diesel hybrid energy storage system and a control method thereof, and belongs to the field of microgrids. The system comprises a photovoltaic power generation unit, a diesel generator set, a hybrid energy storage unit (a storage battery and a super capacitor), an AC / DC bus, a bidirectional AC / DC converter and a system controller. The controller executes hybrid energy storage frequency division control (without sampling load power and distributing power through bus voltage), V / f control and nine multi-mode energy management strategies, and monitors parameters such as photovoltaic output, load power, energy storage charge state and the like in real time to realize intelligent mode switching. The super capacitor preferentially responds to the pulse load, and the voltage fluctuation ratio is smaller than or equal to 5%; the service life of the storage battery is prolonged in combination with energy storage charge state threshold management; photovoltaic maximum utilization enables the system efficiency to be greater than or equal to 90%, and the diesel oil consumption is obviously reduced. The method is suitable for power grid coverage difficulty scenes such as off-network communication base stations, remote sentries and emergency power supply stations, and has high reliability and maneuverability.

The invention provides a direct-current bus type electric vehicle charging system with a source-load-storage cooperative management capability, and belongs to the technical field of electric vehicle charging. Comprising an interface connected with a medium and low voltage power distribution network, a bidirectional AC / DC converter, a common DC bus, a plurality of bidirectional DC / DC converters and a plurality of unidirectional DC / DC converters, the medium and low voltage power distribution network is connected with the AC side of the bidirectional AC / DC converter through a transformer, and the bidirectional AC / DC converter realizes conversion between AC and DC; the direct current side of the bidirectional AC / DC converter is connected to each bidirectional DC / DC converter and each unidirectional DC / DC converter through a common direct current bus; the system takes a direct current bus as a core, has the technical advantages of bidirectional energy flow, modular expansion, multi-scene flexible deployment and the like, and is suitable for various typical application scenes such as intelligent buildings, residential parks, industrial factory areas, micro-grids, power grid energy storage nodes and the like; the defect that an existing electric vehicle charging system cannot be cooperatively managed with a comprehensive energy system can be effectively overcome.

The invention relates to the technical field of electric power systems, in particular to a low-voltage distribution network voltage treatment method based on multi-point flexible direct current interconnection, which breaks through an island operation mode of a transformer area by introducing a flexible interconnection mechanism into a low-voltage distribution network, and improves the reliability of the low-voltage distribution network. Linkage management of multi-region voltage is realized; the flexible direct-current converter is used for realizing quick and real-time adjustment of active and reactive bidirectional power among the nodes; a set of efficient, stable and extensible multi-node power balance control algorithm is constructed, distributed collaborative optimization is realized, and dependence on a central controller is avoided; on the premise of ensuring the stability of the system, the dynamic management of the low voltage out-of-limit problem and the improvement of the electric energy quality under the complex operation condition are realized.

The invention discloses a double-master-control dynamic cooperation hybrid power system and a control method. The system comprises a double-master-control dynamic cooperation framework, a master control unit A and a master control unit B synchronize data through a communication bus and dynamically distribute tasks according to a load rate; the hybrid energy storage expansion unit is formed by connecting a lithium iron phosphate battery pack and a capacitor bank in parallel through a bidirectional DC / DC converter; a dual-channel redundancy communication mechanism is adopted, a CAN bus is adopted for parallel communication with the Ethernet, automatic switching is achieved in the case of faults, and no data is lost; the predictive fault switching module is used for predicting a fault risk based on the LSTM neural network and starting standby main control unit preloading; and a machine learns a load optimization engine, deploys a reinforcement learning algorithm to dynamically adjust an output ratio and performs online optimization. The method comprises the steps of system initialization, master control task allocation and the like. The task processing efficiency and flexibility of the system are improved, reliable and stable communication is guaranteed, the fault risk is reduced, and the adaptability to load change and the energy utilization efficiency are improved.

The invention discloses a lithium battery broadband impedance online measurement system and method without an additional circuit, and relates to the technical field of lithium battery state monitoring. The system comprises a power DC-DC converter, a driving circuit, a sampling module and a digital controller, the digital controller comprises a converter control module and an impedance calculation and output module, the output end of the driving circuit is connected with the control end of a switching device of the power DC-DC converter, and the output end of the power DC-DC converter is connected with the input end of the sampling module. The output end of the sampling module is connected with the input end of the converter control module and the input end of the impedance calculation and output module. The output end of the converter control module is connected with the input end of the drive circuit. According to the invention, no extra hardware circuit is needed, and online, high-precision and low-cost measurement of the broadband impedance of the lithium battery is realized.

The embodiment of the invention provides a current sharing control method and an AC-DC conversion system, the current sharing control method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt a combination of a bridge topology structure and an LLC resonant tank; comprising the steps of determining a target adjustment phase according to absolute values of three-phase input voltage instantaneous values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target duty ratio of a target adjustment phase in each rectification unit is determined, and the target duty ratio is used for indicating adjustment of the voltage gain of the LLC resonant tank; and adjusting the duty ratio of the control signal of the switching tube in each rectification unit according to the target duty ratio of the target adjustment phase in each rectification unit. According to the embodiment of the invention, the gain of the LLC is changed by adjusting the pulse width of the switching tube control signal in the rectification unit and adjusting the amplitude distribution of the input voltage of the resonant tank, so that the output current of the LLC is controlled, and the purpose of current sharing is achieved.

An electrolysis system has at least two electrolysis installations, a power supply source with a direct voltage output, and a central supply line connected to the direct voltage output. A direct current, at a first direct voltage, can be fed into the central supply line. The electrolysis installations are connected electrically in parallel to the central supply line. For a direct voltage supply from the public power grid a central voltage source converter converts an input-side alternating voltage into the output-side first direct voltage at a direct voltage output. Each electrolysis installation is connected via a DC / DC converter that converts the first direct voltage into a second direct voltage, parallel to the direct voltage output so that the second direct voltage drops across the electrolysis installation. Each of the DC / DC converters can be controlled and / or regulated for adapting a level of its second direct voltage.

One aspect of the invention relates to a bidirectional on-board charger 2 for a vehicle 1, comprising:a bidirectional AC-to-DC converter 8 designed to supply power to an electrical power supply socket 6 for an external electrical device;means for detecting an electrical insulation fault 9, connected to a phase line 12 and to a neutral line 13 of said electrical power supply socket 6; a switch 16 arranged on said phase line 12; a switching means 18 designed to control the switch 16 between a first position P1 in which the means 9 are connected to the socket 6 and a second position P2; a resistor 20 which, when the switch 16 is in the second position P2, is electrically connected to the switch 16 and to a ground 10 of the vehicle.

An electrical on-board power supply of a vehicle includes a traction battery, a charging connection for coupling to a DC charging station, a positive potential line, a negative potential line, reference potential line, and a voltage measuring device between the positive potential line and the reference potential line and / or between the negative potential line and the reference potential line. A DC converter is arranged in the positive potential line and / or in the negative potential line. An isolating element is arranged in the positive potential line and / or in the negative potential line. A processing unit is configured to evaluate the measured voltage(s) and to control opening of the respective isolating element. The processing unit is configured to cause the respective isolating element to open when the triggering criterion or one of the multiple or all of the triggering criteria is / are determined to occur.

The invention discloses a DCDC converter power link health state monitoring system and method, and belongs to the technical field of power management, the system comprises a switch node current sampling module arranged at the front end of an inductor L of a DCDC converter, a load current sampling module arranged at the rear end of the inductor L, and a microcontroller unit (MCU); the microcontroller unit (MCU) synchronously collects the switch node current Isw and the load current Iload, and judges the health state of the DCDC power chip and the peripheral inductor L by analyzing the waveform characteristic parameters of the switch node current Isw. According to the invention, online diagnosis and early warning of power link parameter degradation can be realized, and the reliability and safety of the system are improved.

The invention relates to a single-stage AC-DC converter and a control circuit. The single-stage AC-DC converter comprises a filter, an input rectifier, a filter capacitor Cin, a first switch bridge arm, a second switch bridge arm, a capacitor Cb, an inductor Lb, a resonant cavity formed by a resonant inductor Lr and a resonant capacitor Cr, a transformer T, an output rectifier and an output capacitor Co. According to the invention, a traditional two-stage AC-DC converter and a control circuit are simplified. Compared with a single-stage AC-DC converter in the prior art, the problem that the current of a resonant cavity is too large can be solved only by adding one inductor, meanwhile, the control strategy is simple, the frequency range conversion of a switching tube is small, and soft switching of the switching tube is easy to achieve, so that high efficiency is easy to obtain, input current can be corrected to achieve a high power factor, and the power factor is high. And the output voltage ripple is small, and the method has remarkable engineering application value and market prospect.

An on board charger for a vehicle including an electric machine and a battery system includes a power inverter and a DC-DC converter. A filter including first and second inputs is selectively connected to an AC source and first and second outputs. The first output of the filter is connected to one of the first node, the second node, and the third node between switches of phase legs of the power inverter. A switching device includes a first terminal connected to the one of the first node, the second node, and the third node, a second terminal connected to a second output of the filter, and a third terminal connected to one of the first, second, and third phase windings of the electric machine corresponding the one of the first node, the second node, and the third node.