CN112224054B

CN112224054B - Energy conversion device and vehicle

Info

Publication number: CN112224054B
Application number: CN201910582137.5A
Authority: CN
Inventors: 李吉成; 谢飞跃; 张宇昕; 杨宁; 金雪虎
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-06-30
Filing date: 2019-06-30
Publication date: 2022-04-15
Anticipated expiration: 2039-06-30
Also published as: CN112224054A

Abstract

The application provides an energy conversion device and a vehicle, the energy conversion device comprises a motor coil of a motor, a bridge arm converter, a bus capacitor connected with the bridge arm converter in parallel and a controller connected with the bridge arm converter, when the energy conversion device is connected to an external power supply, the controller controls the bridge arm converter to enable electric energy of the external power supply to flow to a heating and charging circuit according to power to be heated of the motor coil, power to be charged of an external battery and zero output torque of the motor, and adjusts current of the heating and charging circuit, so that the external power supply can charge the battery and simultaneously heat the motor coil Low integration level, large volume and high cost.

Description

Energy conversion device and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to an energy conversion device and a vehicle.

Background

In recent years, with the continuous development of electric vehicle technology, the market acceptance of electric vehicles is continuously improved, and battery charging and motor driving are widely concerned as core technologies in electric vehicles. At present, a battery charging circuit and a heating circuit in the existing electric automobile on the market are separated, the battery charging circuit is used for charging the battery of the electric automobile, the heating circuit is used for generating heat to heat the electric automobile, and the two circuits are mutually independent and independent.

However, although the battery charging and heating processes of the electric vehicle can be completed by using two circuits respectively, the two circuits in the above method are independent of each other, so that the control circuit including the battery charging circuit and the heating circuit has a complicated structure, a low integration level, a large volume and a high cost.

In summary, the prior art has the problems of complex overall circuit structure, low integration level, large volume and high cost of the motor control system.

Disclosure of Invention

The application aims to provide an energy conversion device and a vehicle, and aims to solve the problems that in the prior art, a motor driving and charging system is complex in overall structure, low in integration level, large in size and high in cost.

The energy conversion device comprises a motor coil of a motor, a bridge arm converter, a bus capacitor connected with the bridge arm converter in parallel and a controller connected with the bridge arm converter;

the bridge arm converter is connected with the motor coil;

the motor coil, the bus capacitor and the bridge arm converter are all connected with an external charging port, and the bus capacitor is connected with an external battery in parallel;

the external charging port, the motor coil, the bridge arm converter, the bus capacitor and the battery form a heating and charging circuit;

when the energy conversion device is connected with an external power supply through the external charging port, the controller controls the bridge arm converter to enable electric energy of the external power supply to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, adjusts the current of the heating and charging circuit, enables the external power supply to charge the battery, enables the motor coil to consume power to generate heat and enables the motor to output the zero torque.

A second aspect of the present application provides an energy conversion apparatus comprising:

a motor;

the vehicle-mounted charging module comprises a charging connection end group, and the charging connection end group comprises a first charging connection end and a second charging connection end;

the motor control module comprises a bridge arm converter, and the bridge arm converter is connected with a motor coil of the motor;

the energy storage module comprises an energy storage connecting end group and a bus capacitor which are connected in parallel, the bus capacitor is connected with the bridge arm converter in parallel, and the energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end;

a controller connected to the bridge arm converter;

the motor coil, the bridge arm converter and the bus capacitor form a heating and charging circuit;

the controller controls the bridge arm converter to enable external electric energy to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, and adjusts the current of the heating and charging circuit, so that the external power supply charges the battery and simultaneously enables the motor coil to be heated.

A third aspect of the present application provides a vehicle further including the energy conversion apparatus provided in the first aspect or the second aspect.

The application provides an energy conversion device and a vehicle, the energy conversion device comprises a motor coil of a motor, a bridge arm converter, a bus capacitor connected with the bridge arm converter in parallel and a controller connected with the bridge arm converter, the motor coil, the bridge arm converter, the bus capacitor, an external power supply and an external battery form a heating and charging circuit, when the energy conversion device is connected to the external power supply, the controller controls the bridge arm converter to enable the electric energy of the external power supply to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, and adjusts the current of the heating and charging circuit to enable the external power supply to charge the battery and simultaneously enable the motor coil to be heated, the motor coil, the bridge arm converter and the bus capacitor are arranged in the energy conversion device and form a heating and charging circuit with the external power supply and the external battery, the motor coil can be heated while the battery is charged only by controlling the bridge arm converter and then adjusting the current flowing to the heating and charging circuit from the external power supply, so that the battery is charged by adopting the same system and the motor coil consumes electricity to generate heat, the multiplexing degree of components is high, the system integration level is high, the structure is simple, the system cost is reduced, the system volume is reduced, and the problems of complex overall structure, low integration level, large volume and high cost of the existing motor control system are solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;

fig. 2 is a circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 3 is another circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 4 is another schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;

FIG. 5 is a current waveform diagram of a heating and charging circuit of an energy conversion device according to an embodiment of the present disclosure;

fig. 6 is another schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;

fig. 7 is a current flow diagram of a dc power supply of an energy conversion device according to an embodiment of the present application;

fig. 8 is another current flow diagram of a dc power supply of an energy conversion device according to an embodiment of the present application;

fig. 9 is another current flow diagram of a dc power supply of an energy conversion device according to an embodiment of the present application;

fig. 10 is another current flow diagram of a dc power supply of an energy conversion device according to an embodiment of the present application;

fig. 11 is a current flow diagram of an ac power supply of an energy conversion device according to an embodiment of the present application;

fig. 12 is another current flow diagram of an ac power supply of an energy conversion device according to an embodiment of the present application;

fig. 13 is another current flow diagram of an ac power supply of an energy conversion device according to an embodiment of the present application;

fig. 14 is another current flow diagram of an ac power supply of an energy conversion device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of an energy conversion device according to a second embodiment of the present application;

fig. 16 is a schematic structural diagram of a vehicle according to a third embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

An energy conversion device according to an embodiment of the present application is provided, as shown in fig. 1, and includes a motor coil of a motor 101, a bridge arm converter 102, a bus capacitor 103 connected in parallel with the bridge arm converter 102, and a controller 104 connected to the bridge arm converter 102;

the bridge arm converter 102 is connected with the motor coil;

the motor coil, the bus capacitor 103 and the bridge arm converter 102 are all connected with an external charging port 106, and the bus capacitor 103 is connected with an external battery 105 in parallel;

the external charging port 106, the motor coil, the bridge arm inverter 102, the bus capacitor 103 and the battery 105 form a heating and charging circuit;

when the energy conversion device is connected to an external power supply through an external charging port 106, the controller 104 controls the bridge arm inverter 102 to cause the electric energy of the external power supply to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery 105, and the zero output torque of the motor, and adjusts the current of the heating and charging circuit, so that the external power supply charges the battery 105, causes the motor coil to consume power to generate heat, and causes the motor to output the zero torque.

The motor 101 may be a synchronous motor (including a brushless synchronous motor) or an asynchronous motor, the number of motor phases is greater than or equal to 3 (such as a three-phase motor, a five-phase motor, a six-phase motor, a nine-phase motor, a fifteen-phase motor, and the like), a connection point of a motor coil forms a pole leading-out neutral line to be connected with an external power supply, the number of motor poles is a common divisor of the number of poles, the number of specific motor poles depends on a winding parallel structure inside the motor, and the number of leading-out neutral lines and the number of parallel poles of the neutral lines inside the motor are determined by the use condition of an actual scheme; the bridge arm converter 102 comprises bridge arms connected in parallel in multiple phases, the number of the bridge arms in the bridge arm converter 102 is configured according to the phase number of the motor, each phase of the bridge arm comprises two power switch units, the power switch units can be transistor, IGBT, MOSFET, SIC and other device types, the connection point of the two power switch units in the bridge arms is connected with a phase coil in the motor, and the power switch units in the bridge arm converter 102 can be switched on and off according to a control signal of the controller 104; the external power supply can be power supply equipment for providing direct current, the power supply equipment can be direct current provided by a direct current charging pile, also can be direct current output by a single-phase and three-phase alternating current charging pile after rectification, also can be electric energy generated by a fuel cell, also can be a power supply form such as direct current rectified by a generator controller, and the like, wherein the zero output torque of the motor means that the motor does not output torque, the driving power of the motor is zero, but current passes through a motor coil and generates heat.

Wherein, the controller 104 controls the bridge arm converter 102 to make the electric energy of the external power supply flow to the heating and charging circuit according to the power to be heated of the motor 101, the power to be charged of the external battery 105 and the zero output torque of the motor, which means to obtain the power to be heated of the motor, the power to be heated can be obtained by detecting the temperature of the component to be heated through the whole vehicle controller, for example, the component to be heated can be a rechargeable battery, the required heating power is calculated according to the current temperature of the battery, the power to be charged of the battery is obtained according to the power required for charging of the battery, and the current flowing through the motor coil is adjusted by adjusting the conducting or turning-off and conducting time of different power switches in the bridge arm converter 102 according to the power to be heated, the power to be charged and the zero output torque, the current direction of the motor coil is the direction flowing into the coil of each phase in the motor or the direction flowing out of each phase coil in the motor, the magnitude of the current of the motor coil refers to the magnitude of the current flowing into or flowing out of each phase coil in the motor, for example, the current flows into the motor coil connected to the a-phase arm in the arm inverter 102, and flows out of the motor 101 from the motor coils connected to the B-phase and C-phase arms in the arm inverter 102, the torque output and the heating power of the motor 101 can be adjusted by adjusting the magnitude and the direction of the current of each phase coil in the motor 101, and the sum of the magnitudes of the currents flowing through the motor 101 is equal to the input current of the connection point of each phase coil of the motor 101, which can be used for adjusting the charging power, and the charging process of the battery 105 by the external power source, the process of consuming power and generating heat by the motor coil, and the zero torque output by the motor 101 can be simultaneously controlled by adjusting the magnitude and the direction of the current of each phase coil of the motor 101.

The technical effect of the energy conversion device in the embodiment of the application is as follows: the motor coil is arranged in the energy conversion device, the bridge arm converter and the bus capacitor form a heating and charging circuit with an external power supply and an external battery, the motor coil can be heated while the battery is charged only by controlling the working state of the bridge arm converter and then adjusting the current flowing to the heating and charging circuit from the external power supply, and further the battery is charged and the motor coil consumes power to generate heat by adopting the same system.

As one embodiment, the motor comprises x sets of windings, wherein x is more than or equal to 1 and is an integer, and the number of phases of the x set of windings is m_xEach phase winding of the x-th set of windings comprises n_xA coil branch of n for each phase winding_xThe coil branches are connected together to form a phase terminal, n of each phase winding in the x-th set of windings_xOne of the coil branches is also respectively connected with n of other phase windings_xOne of the coil branches is connected to form n_xA connection point, wherein n_x≥1，m_xNot less than 2, and m_x，n_xIs an integer;

x sets of windings are formed together

A plurality of connection points, wherein each connection point is provided with a plurality of connection holes,

the connecting points form T neutral points, and N neutral lines are led out from the T neutral points, wherein:

x≥1，m_x2 or more, range of T:

the range of N: t is more than or equal to N and more than or equal to 1, and T, N are integers.

Motor 101 is connected to a motor controller formed by a bridge arm inverter 102, and bridge arm inverter 102 includes K sets of M_xRoad bridge arm, K groups M_xThe first end and the second end of each of the bridge arms are respectively connected in common, and a group of M_xThe middle point of at least one of the road bridge arms and one set of m_xThe phase terminals in the phase windings are connected in a one-to-one correspondence, where M is_x≥m_xK is not less than x and is K, M_xAre all integers.

Wherein, as shown in fig. 2, when K is 1, x is 1,m₁＝M₁when the current is 3, the bridge arm converter 102 includes three-way bridge arms, the motor 101 includes three-phase windings, each phase winding includes one phase coil branch, each phase winding is connected to a midpoint of one bridge arm, the three-phase windings form a connection point, the connection point is a neutral point, a neutral line is led out from the neutral point and is connected to the external charging port 106, two ends of each bridge arm in the three-way bridge arms are respectively connected in common to form a first bus end and a second bus end, a bus capacitor C1 is connected in parallel between the first bus end and the second bus end, a first end of the bus capacitor C1 is connected to a first end of a switch K1 and a first end of a switch K2, a second end of the bus capacitor C1 is connected to a first end of a switch K3, a second end of a switch K2 is connected to a first end of a resistor R, a second end of the switch K1 is connected to a second end of the resistor R and a positive end of the battery 105, and a second end of the switch K3 is connected to a negative end of the battery 105.

Wherein, as shown in fig. 3, when K is 1, x is 2, m₁＝3，M₁When the bridge arm converter 102 is 6, the bridge arm converter comprises six bridge arms, the motor comprises 2 sets of three-phase windings, each phase winding in each set of three-phase windings comprises a 1-phase coil branch, each phase winding is correspondingly connected with the middle point of one bridge arm, each set of three-phase windings forms a connection point, 2 connection points of the 2 sets of three-phase windings are connected together to form a neutral point, the neutral point leads out a neutral line and is connected with an external charging port 106, two ends of each bridge arm in the three bridge arms are respectively connected together to form a first bus end and a second bus end, a bus capacitor C1 is connected between the first bus end and the second bus end in parallel, the first end of the bus capacitor C1 is connected with the first end of a switch K1 and the first end of a switch K2, the second end of the bus capacitor C1 is connected with the first end of a switch K3, the second end of the switch K2 is connected with the first end of a resistor R, the second end of the switch K1 is connected with the second end of the resistor R and the positive end of the battery 105, a second terminal of switch K3 is connected to the negative terminal of battery 105.

In the embodiment, by setting the number of phases of the motor winding and the number of bridge arms of the bridge arm converter, neutral points formed by connecting different numbers of connecting points of the motor winding in parallel are led out to form neutral lines, so that equivalent phase inductances of the motor are different, the current carrying capacity in the neutral points of the motor is different, and according to the requirements of charging power and inductance, a proper number of connecting points are selected to be connected in parallel to form neutral points led out to form neutral lines, so that the required charging power and inductance are obtained, and the charging power is satisfied while the charging and discharging performance is improved.

In one embodiment, the controller 104 obtains the conduction time and duration of the bridge arm inverter 102 according to the power to be heated of the motor coil, the power to be charged of the external battery 105, and the motor zero output torque, and adjusts the current of the heating and charging circuit according to the conduction time and duration.

As an embodiment, as shown in fig. 2, taking a three-phase motor as an example, the target voltage of the step-down side capacitor C2 is obtained, the current voltage of the battery is obtained, and the maximum output voltage of the charging pile is obtained by communicating with an external power source (charging pile), where the target voltage of the step-down side capacitor is the minimum value of the current voltage of the power battery and the maximum output voltage of the charging pile.

And calculating the target input current of the three-phase motor according to the required heating power, the required charging power, the zero torque output of the motor and the target voltage.

According to the formula

Calculating a target input current, P being the required heating power, P₂For required charging power, U₂Is the target voltage of the buck-side capacitor.

And acquiring the target current of each phase of electricity of the three-phase motor according to the position of the motor rotor, the required heating power, the target input current and the zero torque output of the motor.

Calculating a target current of each phase of electricity of the three-phase motor according to the following formula 1, formula 2 and formula 3 according to the motor rotor position, the target input current and the motor torque output value:

equation 1:

equation 2: IA + IB + IC ═ I

Equation 3: p ═ i (IA × IA + IB × IB + IC × IC) × R

Where α is the rotor lag angle, IA, IB, IC are the target current for each phase of the three-phase motor, I is the target input current, Te is the motor zero torque output, λ, ρ, L_d,L_qThe motor parameters are P, the heating power is P, and the equivalent impedance of the three-phase motor is R.

The target current IA, IB, IC of each phase of the three-phase motor can be obtained according to formula 1, formula 2, and formula 3.

Obtaining the average duty ratio of the three-phase electric control pulse according to the target voltage of the capacitor on the voltage reduction side, the target input current and the voltage of the battery by the following formula:

equation 4: u shape₂＝U₁×D₀-I x R, wherein U₂For the target voltage of the buck-side capacitor, U₁Is the voltage of the power cell, D₀The average duty ratio of the three-phase electric control pulse is shown, I is target input current, and R is equivalent impedance of the three-phase motor.

Wherein, U₁×D₀The above formula can be obtained by summing the voltage across the three-phase inverter equal to the sum of the voltage drop across the three-phase motor and the target voltage of the capacitor on the voltage reduction side.

Obtaining a first target duty ratio of a control pulse of each phase bridge arm according to the average duty ratio, the target input current, the target current of each phase and the voltage of the battery according to the following formula:

equation 5:

wherein, I₁Target current for each phase of electricity, R₁Equivalent impedance of each phase coil, D₁Is the target duty cycle of the control pulse for each phase of the bridge arm.

When the current flowing direction in the winding coil is from the connection point of each phase bridge arm and each phase coil to the voltage reduction side capacitor, the connection between each phase bridge arm and each phase coilThe voltage of the connection point is greater than that of the capacitor at the voltage reduction side, and the voltage of the connection point of each phase bridge arm and each phase coil is equal to the sum of the voltage drop on the phase coil and the target voltage of the capacitor at the voltage reduction side, namely U₁×D₁＝R₁×I₁+U₂When the current in the winding coil flows from the voltage reduction side capacitor to the connection point of each phase bridge arm and each phase coil, the voltage of the connection point of each phase bridge arm and each phase coil is less than the voltage of the voltage reduction side capacitor, and the voltage of the connection point of each phase bridge arm and each phase coil is equal to the difference between the target voltage of the voltage reduction side capacitor and the voltage drop on the phase coil, namely U₁×D₁＝U₂-R₁×I₁And combining the formula 4 to obtain a formula 5, namely obtaining the target duty ratio of the control pulse of each phase of bridge arm.

The method comprises the steps of obtaining a current vector position according to a motor torque output value, further obtaining a phase relation of three-phase currents, obtaining the conduction time of a bridge arm converter according to the phase of each phase of current, and obtaining the conduction time of the bridge arm converter according to the target duty ratio of control pulses of each phase of bridge arm.

Compared with the independent realization of charging or driving control, the method has the advantages that the conduction time of the bridge arm converter is prolonged, and the current flowing to the heating and charging circuit from the external power supply is adjusted, so that the external power supply can charge the battery while the motor coil consumes power to generate heat.

As an embodiment, the external charging port is a dc charging port, the external power source is a dc power supply device, and the duty cycle of the heating and charging circuit includes a first duty cycle and a second duty cycle; the motor coil includes a first coil and a second coil, and the arm converter 102 includes a first arm connected to the first coil and a second arm connected to the second coil.

In the first working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the battery 105 and the zero output torque of the motor, so that the electric energy of the dc power supply equipment flows back to the dc power supply equipment after passing through the first coil and the first bridge arm, and meanwhile, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm.

In the second working phase, the controller 104 controls the time and duration of the conduction of the first bridge arm and the second bridge arm, the electric energy of the dc power supply equipment flows through the battery 105 and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply equipment, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

In the first working phase, the first coil is a phase coil or at least two connected coils, the first bridge arm is a bridge arm or at least two parallel connected bridge arms, a phase coil in the first coil is connected with a bridge arm in the first bridge arm, the second coil is a phase coil or at least two connected coils, the second bridge arm is a bridge arm or at least two parallel connected bridge arms, a phase coil in the second coil is connected with a bridge arm in the second bridge arm, the difference between the first coil and the second coil is that the current flow directions of the two coils are in opposite states, for example, the first bridge arm of the bridge arm converter 102 is controlled to make the current flow in the first coil in a first direction, the first direction can be from the motor to the bridge arm converter 102, the second bridge arm of the bridge arm converter 102 is controlled to make the current flow in the second coil in a second direction, the second direction may be from the arm inverter 102 to the motor, that is, currents in different directions simultaneously flow in the motor coil in the first operation stage, so that control of the output torque of the motor 101 and power consumption and heat generation of the motor coil can be realized.

It should be noted that the coils of the first coil and the second coil are not fixed, the first coil and the second coil are changed according to the direction of current, and the power switch of the bridge arm connected to the coils can be selected and controlled, for example, the motor includes a first phase coil L1, a second phase coil L2, and a third phase coil L3, the lower arm of the bridge arm connected to the first phase coil L1 is controlled to be turned on so that the current in the first phase coil L1 flows from the motor coil to the bridge arm inverter 102, the upper arm connected to the second phase coil L2 and the third phase coil L3 is controlled to be turned on so that the current in the second phase coil L2 and the third phase coil L3 flows from the bridge arm inverter 102 to the motor coil, in this case, the first coil is the first phase coil L1, the second coil is the second phase coil L2, and the third phase coil L3, and in the next period, the power switch turned on in the bridge arm is changed, the change of the current direction in the motor coil can be realized by a first phase coil L1 and a second phase coil L2 as the first coil, and a third phase coil L3 as the second coil.

In the first working stage, the electric energy of the dc power supply device flows back to the dc power supply device after passing through the first coil and the first bridge arm, so as to store the electric energy of the dc power supply device in the first coil, that is, to realize the energy storage process in the charging process of the dc power supply device on the battery 105, since the current flows through the first coil in the energy storage process, the motor coil can consume electricity to generate heat, the conduction duration of the energy storage stage is controlled, so that the stored energy meets the requirement of the battery follow current charging and the heating power of the motor coil in the next working stage, the electric energy on the bus capacitor 103 in the first working stage flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm, so that the bus capacitor 103 discharges the first coil and the second coil through the bridge arm converter 102, and since the first coil and the second coil are connected together, therefore, the directions of the currents flowing through the first coil and the second coil are different, and the energy can be stored in the first coil by the direct-current power supply equipment, and meanwhile the motor coil consumes electricity and generates heat.

The first working stage and the second working stage form a cycle, and the cycle is a fixed value, so that the conduction time and the conduction duration of the first bridge arm and the second bridge arm in the second working stage can be directly determined after the conduction time and the conduction duration of the first bridge arm and the second bridge arm in the first working stage are determined.

Wherein, the electric energy of the dc power supply device in the second working stage flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply device for realizing that the dc power supply device and the first coil charge the battery and the bus capacitor 103, that is, the follow current charging process in the charging process of the dc power supply device on the battery is realized, the electric energy in the second working stage forms a circular current among the second coil, the first bridge arm and the second bridge arm for making the current in the second coil flow to the first coil, because in the first working process, the current output by the bus capacitor 103 flows through the second coil through the second bridge arm and then flows through the second coil and the first coil, the voltage of the connection point between the second coil and the second bridge arm is increased, because the magnitude relation between the voltage of the capacitor C2 at the charging port side and the voltage of the connection point between the coil and the second bridge arm determines the current flowing direction, if the voltage of the connection point between the second coil and the second bridge arm is greater than the voltage of the capacitor on the charging port side, the direction of the winding current flows from the connection point between the second coil and the second bridge arm, so that the current in the second coil can flow to the first coil, and the first coil and the second coil are connected together, so that the directions of the currents flowing in the first coil and the second coil are different, and the current flows in the first coil and the second coil, so that the current consumption of the motor coil can be generated while the battery 105 and the bus capacitor 103 are charged by the direct-current power supply device and the first coil, and heat can be generated.

When heating and charging are cooperatively controlled as shown in fig. 5, a current waveform diagram on a certain phase of the motor 101 is shown, the bridge arm converter 102 outputs current to the motor end, the direction of the current flowing into the phase winding of the motor is taken as a positive direction, and as can be seen from fig. 5, a negative direct-current component is superimposed on each phase current of the motor 101 on the basis of a sine wave; the negative dc component is the average current of the external power source flowing into each phase of the motor in each period, the energy output by the external power source is greater than the heating power generated by the motor coil power consumption, and the remaining energy is the energy for charging the battery 105.

In this embodiment, the working cycle of the heating and charging circuit is divided into a first working phase and a second working phase, each working phase includes a charging process for the battery and a process for consuming power and generating heat of the motor coil, and currents of the heating and charging circuit in the first working phase and the second working phase are respectively adjusted by controlling the conduction time and duration of the first bridge arm and the second bridge arm, so that a part of energy output by the dc power supply device in the whole working cycle is used for charging the battery, and a part of energy is used for consuming power and generating heat of the motor coil, thereby realizing cooperative work of charging the battery and consuming power and generating heat of the motor coil.

As an embodiment, in the second operation phase, the controller 104 controls the time and duration of the conduction of the first bridge arm and the second bridge arm according to the power to be charged of the battery, so that the electric energy of the dc power supply device flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply device, and meanwhile, the electric energy forms a circulating current among the second coil, the first bridge arm, and the second bridge arm.

The method is characterized in that the time and the time of conduction of the first bridge arm and the second bridge arm can be determined again according to the charging power in the second working stage.

As an embodiment, the operation period of the heating and charging circuit is preceded by a start-up period of the heating and charging circuit;

the start-up cycle of the heating and charging circuit includes a first start-up phase and a second start-up phase;

in a first starting stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the charging power of the battery 105 and the zero output torque of the motor, so that the electric energy of the direct current power supply equipment flows back to the direct current power supply equipment after passing through the first coil and the first bridge arm;

in the second starting stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the dc power supply equipment flows through the battery 105 and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply equipment.

Wherein, the heating and charging circuit also includes a start cycle before the working cycle, the start cycle only works when the power is on, the start cycle does not work after the working cycle is started, then the working cycle works circularly, the start cycle charges the bus capacitor 103, the first start stage in the start cycle is used for making the DC power supply device store energy for the first coil, the second start stage makes the DC power supply device and the first coil charge the bus capacitor 103 and the battery 105, to ensure the high voltage formed on the bus at the two sides of the bus capacitor 103, when the working cycle starts, the bus capacitor 103 discharges the motor coil through the bridge arm converter 102, then the DC power supply device and the first coil charge the bus capacitor 103, to make the working cycle work, besides, the first coil in the start cycle is part of the coil in the motor coil, for example, when the motor 101 is a three-phase motor, the three-phase bridge arm power switches may be selected to control simultaneously, that is, the three-phase upper bridge arm and the three-phase lower bridge arm may be turned off simultaneously in the first start stage, the three-phase upper bridge arm and the three-phase lower bridge arm may be turned on simultaneously in the second start stage, and the three-phase lower bridge arm and the three-phase upper bridge arm may be turned off simultaneously in the second start stage.

In the embodiment, the starting period is set when the direct-current power supply equipment is connected, the bus capacitor is charged through the starting period when the direct-current power supply equipment is started, and the first stage of the working period is started through the bus capacitor when the working period starts, so that the normal starting and the circulating work of the working period are realized.

As an embodiment, as shown in fig. 6, the energy conversion apparatus further includes a bidirectional bridge arm 107, the external charging port 106 further includes an ac charging port 108, the bidirectional bridge arm 107 is connected in parallel with the bridge arm converter 102, the bidirectional bridge arm 107 is further connected to the controller 104 and the ac charging port 108, the ac charging port 108 is connected to an ac power supply device, and a working cycle of the heating and charging circuit includes a third working phase and a fourth working phase;

in a third working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107 according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm 107 or the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the bidirectional bridge arm 107, the second bridge arm and the second coil, and meanwhile, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller 104 controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107, so that the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the first coil, the first bridge arm, the battery and the bus capacitor 103 and flowing through the bidirectional bridge arm 107, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the bidirectional bridge arm 107, the bus capacitor 103, the second bridge arm and the second coil, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

Wherein, the bidirectional bridge arm 107 comprises power switch modules connected in series, and is used for transmitting a received current to the ac charging port or receiving a current output by the ac charging port, in a third working phase, the electric energy of the ac power supply equipment flows back to the ac power supply equipment through the first coil, the first bridge arm and the bidirectional bridge arm, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment through the bidirectional bridge arm 107, the second bridge arm and the second coil, and is used for storing the electric energy of the ac power supply equipment in the first coil, that is, realizing an energy storage process in the process of charging the battery by the ac power supply equipment, in the energy storage process, since a current passes through the coil, at this time, the motor coil is in a power consumption heating state, the electric energy on the bus capacitor 103 in the third working phase flows back to the bus capacitor 103 through the second bridge arm, the second coil, the first coil and the first bridge arm, the energy storage device is used for enabling the bus capacitor 103 to discharge the first coil and the second coil through the bridge arm converter 102, and the first coil and the second coil are connected together, so that the directions of currents flowing in the first coil and the second coil are different, and energy storage of the first coil by alternating current power supply equipment can be realized, and meanwhile, power consumption and heat generation of the motor coil can be realized.

The third working stage and the fourth working stage form a cycle, and the cycle is a fixed value, so that when the conduction time and duration of the first bridge arm and the second bridge arm in the first working stage are determined, the conduction time and duration of the first bridge arm and the second bridge arm in the fourth working stage can be directly determined.

Wherein, the electric energy of the ac power supply equipment in the fourth working phase flows through the battery 105 and the bus capacitor 103 after passing through the first coil, the first bridge arm and the bidirectional bridge arm 107 and flows back to the ac power supply equipment after passing through the bidirectional bridge arm 107, so as to realize that the ac power supply equipment and the first coil charge the battery and the bus capacitor 103, that is, to realize the follow current charging process of the ac power supply equipment in the charging process of the battery 105, since current flows through the motor coil in the follow current charging process, the power consumption and heat generation of the motor coil are realized, meanwhile, a part of the stored energy in the energy storage phase is used for heating the motor coil to meet the heating power requirement, and the rest part is used for charging the battery, and the electric energy in the fourth working phase forms a circulating current among the second coil, the first bridge arm and the second bridge arm, so as to make the current in the second coil flow to the first coil, in the third working process, the current output by the bus capacitor 103 flows through the second coil and the first coil through the second bridge arm, so that the voltage at the connection point between the second coil and the second bridge arm is greater than the voltage at the connection point between the first coil and the first bridge arm, and therefore the current in the second coil flows to the first coil.

In the embodiment, a bidirectional bridge arm is arranged in the energy conversion device, and a bipolar control mode is adopted in the third working stage, so that the current in the positive half period of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm, and the current in the negative half period of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil.

As an embodiment, in the fourth operation phase, the controller 104 controls the time and duration of the conduction of the first arm and the second arm according to the power to be charged of the battery 105, so that the electric energy of the ac power supply device flows through the battery 105 and the bus capacitor 103 and flows back to the ac power supply device after passing through the first coil, the first arm and the bidirectional arm 107, or the electric energy of the ac power supply device flows back to the ac power supply device after passing through the bidirectional arm 107, the bus capacitor 103, the second arm and the second coil, and meanwhile, the electric energy forms a circulating current among the second coil, the first arm and the second arm.

The method is characterized in that the time and the duration of the conduction of the first bridge arm and the second bridge arm can be determined again according to the power to be charged in the fourth working stage, the method is different from the above embodiment in that the working period of the heating and charging circuit is not a constant period, and the time and the duration of the conduction of the first bridge arm and the second bridge arm are determined again to realize variable period control of the heating and charging circuit, so that the control of the charging process of the heating and charging circuit and the heating process of the motor coil is more flexible, and the working efficiency of the heating and charging circuit is improved conveniently.

As an embodiment, as shown in fig. 6, the energy conversion apparatus further includes a bidirectional bridge arm 107, the external charging port 106 further includes an ac charging port 108, the bidirectional bridge arm 107 is connected in parallel with the bridge arm converter 102, the bidirectional bridge arm 107 is further connected to the controller 104 and the ac charging port 108, the ac charging port 108 is connected to an ac power supply device, and a working cycle of the heating and charging circuit includes a third working phase and a fourth working phase; the motor coil includes a first coil and a second coil, and the bridge arm converter 102 includes a first bridge arm connected to the first coil and a second bridge arm connected to the second coil;

in a third working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107 according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm, the battery 105, the bus capacitor 103 and the bidirectional bridge arm, and meanwhile, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller 104 controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm, the battery 105, the bus capacitor 103 and the bidirectional bridge arm, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

The bidirectional bridge arm 107 comprises power switch modules connected in series, and is used for transmitting a received current to an alternating current charging port or receiving a current output by the alternating current charging port, in a third working phase, electric energy of alternating current power supply equipment flows back to the alternating current power supply equipment after passing through a first coil, the first bridge arm, a battery 105, a bus capacitor 103 and the bidirectional bridge arm 107, so that the alternating current power supply equipment charges the battery, in the charging process, as the current passes through the coil, the motor coil is in a power consumption heating state, in the third working phase, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through a second bridge arm, a second coil, the first coil and the first bridge arm, so that the bus capacitor 103 discharges the first coil and the second coil through the bridge arm converter 102, and as the first coil and the second coil are connected together, the direction of the current flowing through the first coil and the second coil is different, and therefore energy storage of the first coil by the alternating-current power supply equipment can be achieved, and meanwhile power consumption and heat generation of the motor coil can be achieved.

In the fourth working phase, the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm, the battery 105, the bus capacitor 103 and the bidirectional bridge arm, and is used for realizing that the alternating current power supply equipment and the first coil charge the battery and the bus capacitor 103, namely realizing the follow current charging process of the alternating current power supply equipment in the charging process of the battery 105, wherein in the follow current charging process, as current flows through the motor coil and simultaneously realizes that the motor coil consumes electricity and generates heat, the electric energy in the fourth working phase forms a circulation among the second coil, the first bridge arm and the second bridge arm, and is used for enabling the current in the second coil to flow to the first coil, and as in the third working process, the current output by the bus capacitor 103 flows through the second coil and the first coil through the second bridge arm, the voltage of a connection point between the second coil and the second bridge arm is larger than the voltage of the connection point between the first coil and the first bridge arm, therefore, the current in the second coil can flow to the first coil, and since the first coil and the second coil are connected together, the directions of the currents flowing in the first coil and the second coil are different, and heat generation by power consumption of the motor coil can be realized while the battery and the bus capacitor 103 are charged by the ac power supply device and the first coil.

The difference between this embodiment and the above embodiments is that the electric energy of the ac power supply device flows back to the ac power supply device through the first coil, the first bridge arm, the battery, the bus capacitor, and the bidirectional bridge arm, and the ac power supply device charges the inductance coil and the battery, thereby realizing direct charging of the battery without passing through the energy storage and voltage boosting stage of the motor coil.

the start-up cycle of the heating and charging circuit includes a third start-up phase and a fourth start-up phase;

in a third starting stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107 according to the power to be driven of the motor 101 and the power to be charged of the battery 105, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm 107 or the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the bidirectional bridge arm 107, the second bridge arm and the second coil;

in the fourth starting phase, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm 107, so that the electric energy of the ac power supply equipment flows through the bidirectional bridge arm 107 after passing through the first coil, the first bridge arm, the battery and the bus capacitor 103 and then flows back to the ac power supply equipment, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the bidirectional bridge arm 107, the bus capacitor 103, the second bridge arm and the second coil.

The heating and charging circuit further comprises a starting period before the working period, the starting period is used for charging the bus capacitor 103, the third starting period is used for enabling the alternating current power supply equipment to store energy for the first coil, the fourth starting period enables the alternating current power supply equipment and the first coil to charge the bus capacitor 103, high voltage is formed on buses on two sides of the bus capacitor 103, when the working period starts, the bus capacitor 103 discharges a motor coil through the bridge arm converter 102, and then the bus capacitor 103 is charged through the alternating current power supply equipment and the first coil, so that the working period can work circularly.

The following describes the technical solution of the embodiment of the present application in detail through a specific circuit structure:

as shown in fig. 7, the bridge arm converter 102 includes a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, a control end of each power switch unit is connected to the controller 104, the first power switch unit and the second power switch unit in the bridge arm converter 102 form a first phase bridge arm, the third power switch unit and the fourth power switch unit form a second phase bridge arm, the fifth power switch unit and the sixth power switch unit form a third phase bridge arm, the first power switch unit includes a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit includes a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit includes a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit includes a fourth lower bridge arm 4 and a fourth lower bridge diode 4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the first power switch unit, the third power switch unit and the fifth power switch unit are connected together to form a first junction end, the second power switch unit, the fourth power switch unit and the sixth power switch are connected together to form a second junction end, a bus capacitor C1 is connected between the first junction end and the second junction end, two ends of each bridge arm in the three bridge arms are respectively connected together to form a first junction end and a second junction end, a bus capacitor C1 is connected between the first junction end and the second junction end in parallel, a first end of the bus capacitor C1 is connected with a first end of a switch K1 and a first end of a switch K2, a second end of the bus capacitor C1 is connected with a first end of a switch K3, and a second end of a switch K2 is connected with a first end of a resistor R, a second end of the switch K1 is connected to a second end of the resistor R and a positive end of the battery 105, a second end of the switch K3 is connected to a negative end of the battery 105, the motor includes a first phase coil L1, a second phase coil L2 and a third phase coil L3, one end of each phase coil is connected together to form a neutral point connected to the dc power supply device, and the other end of each phase coil is connected to a midpoint of one phase arm, respectively, wherein when the first coil is a first phase coil L1 and the second coil includes a second phase coil L2 and a third phase coil L3, the dc power supply device, the first phase coil L1 and the second power switch form a dc energy storage circuit, the dc energy storage circuit is not only used for energy storage but also used for enabling the motor coil to generate heat, and as an implementation manner, a current VT flows to flow from the positive electrode of the dc power supply device through the first phase coil L1 and the second lower arm 2 and returns to the negative electrode of the dc power supply device; the direct-current power supply equipment, the first phase coil L1, the first power switch, the bus capacitor C1 and an external battery form a battery charging loop, the battery charging loop is used for storing energy and enabling the motor coil to generate heat, and current flows to the direction that the positive electrode of the direct-current power supply equipment flows through the first phase coil L1, the first upper bridge arm VT1, the battery 105 and the bus capacitor C1 and returns to the negative electrode of the direct-current power supply equipment; when the battery is charged, the motor coils are heated, a bus capacitor C1, a fifth power switch, a third-phase coil L3, a second-phase coil L2, a first-phase coil L1 and a second power switch form a first heating circuit, current flows from one end of the bus capacitor C1 through a fifth upper bridge arm VT5, a third-phase coil L3, a first-phase coil L1 and a second lower bridge arm VT2 to return to the other end of the bus capacitor C1, and current flows from one end of the bus capacitor C1 through the third upper bridge arm VT3, the second-phase coil L2, the first-phase coil L1 and the second lower bridge arm VT2 to return to the other end of the bus capacitor C1; a second phase coil L2, a third phase coil L3, a first phase coil L1, a first power switch, a third power switch and a fifth power switch form a second heating circuit, and circulating currents are respectively formed among the second phase coil L2, the first phase coil L1, a first upper bridge arm VD1 and a third upper bridge arm VT3, and among the third phase coil L3, the first phase coil L1, a first upper bridge diode VD1 and the fifth upper bridge arm VT5 in the flowing direction of current; when the first coil is a first-phase coil L1 and a second-phase coil L2, and the second coil is a third-phase coil L3, the dc power supply device, the first-phase coil L1, the second-phase coil L2, the second power switch, and the fourth power switch form a dc energy storage loop, the dc energy storage loop is not only used for storing energy but also for making the motor coil generate heat, as an implementation manner, a current flow direction is that a positive electrode of the dc power supply device flows through the first-phase coil L1 and the second lower arm VT2 and returns to a negative electrode of the dc power supply device, and a positive electrode of the dc power supply device flows through the second-phase coil L2 and the fourth lower arm VT4 and returns to the negative electrode of the dc power supply device; the direct-current power supply equipment, the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, the bus capacitor C1 and an external battery form a battery charging loop, the battery charging loop is not only used for storing energy but also used for enabling a motor coil to generate heat, the current flows to the direction that the positive electrode of the direct-current power supply equipment flows through the first phase coil L1, the first upper bridge arm VT1, the battery 105 and the bus capacitor C1 and returns to the negative electrode of the direct-current power supply equipment, and meanwhile, the positive electrode of the direct-current power supply equipment flows through the second phase coil L2, the second upper bridge arm VT2, the battery 105 and the bus capacitor C1 and returns to the negative electrode of the direct-current power supply equipment; the bus capacitor C1, the fifth power switch, the third-phase coil L3, the first-phase coil L1, the second-phase coil L2, the second power switch and the fourth power switch form a first heating circuit, current flows from one end of the bus capacitor C1, flows through the fifth upper arm VT5, the third-phase coil L3, the first-phase coil L1 and the second lower arm VT2 and returns to the other end of the bus capacitor C1, and simultaneously, current flows from one end of the bus capacitor C1, flows through the fifth upper arm VT5, the third-phase coil L3, the second-phase coil L2 and the fourth lower arm VT2 and returns to the other end of the bus capacitor C1; the third-phase coil L3, the first-phase coil L1, the second-phase coil L2, the first power switch, the third power switch, and the fifth power switch form a second heating circuit, and the current flows between the third-phase coil L3, the first-phase coil L1, the first upper bridge diode VD1, and the fifth upper bridge arm VT5, and between the third-phase coil L3, the second-phase coil L2, the third upper bridge diode VD3, and the third upper bridge arm VT5, respectively, to form a circulating current.

For the dc power supply, when the first coil is the first phase coil L1, and the second coil is the second phase coil L2 and the third phase coil L3, as shown in fig. 7, in the first working phase, the controller 104 controls the conduction time and duration of the first arm and the second arm according to the power to be heated of the motor coil, the power to be charged of the external battery, and the zero output torque of the motor, so that the current output by the dc power supply device in the dc energy storage loop flows back to the dc power supply device through the first phase coil L1 and the second power switch in sequence, and the current output by the bus capacitor C1 in the first heating circuit flows back to the bus capacitor C1 through the fifth power switch, the third phase coil L3, the second phase coil L2, the first phase coil L1 and the second power switch in sequence, so that the dc energy storage loop and the first heating circuit work simultaneously.

As shown in fig. 8, in the second operation phase, the controller 104 controls the time and duration of the conduction of the first and second arms, so that the current output by the dc power supply device in the battery charging circuit flows through the first phase coil L1, the first power switch, the bus capacitor C1, and the battery flows back to the dc power supply device, and the current output by the second phase coil L2 and the third phase coil L3 in the second heating circuit flows through the first phase coil L1, the first power switch, the third power switch, and the fifth power switch and flows back to the second phase coil L2 and the third phase coil L3, so that the battery charging circuit and the second heating circuit operate simultaneously.

For dc supply, when the first coil is the first phase coil L1 and the second phase coil L2, and the second coil is the third phase coil L3, as shown in fig. 9, in the first working phase, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, so that the current output by the dc power supply device in the dc energy storage loop flows back to the dc power supply device through the first phase coil L1, the second phase coil L2, the second power switch and the fourth power switch in sequence, and meanwhile, the current output by the bus capacitor C1 in the first heating circuit flows through the fifth power switch, the third phase coil L3, the second phase coil L2, the first phase coil L1, the second power switch and the fourth power switch in sequence and flows back to the bus capacitor C1, so that the direct-current energy storage circuit and the first heating circuit work simultaneously.

As shown in fig. 10, in the second operation phase, the controller 104 controls the time and duration of the conduction of the first and second arms, so that the current output by the dc power supply device in the battery charging circuit flows through the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, the bus capacitor C1, and the battery flows back to the dc power supply device, and the current output by the third phase coil L3 in the second heating circuit flows through the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, and the fifth power switch and flows back to the third phase coil L3, so that the battery charging circuit and the second heating circuit operate simultaneously.

As shown in fig. 11, the ac power supply differs from fig. 7 in that: the heating and charging circuit further comprises a bidirectional bridge arm 107, the bidirectional bridge arm 107 comprises a seventh power switch and an eighth power switch, a first end of the seventh power switch is connected to a first bus end of the bridge arm converter 102, a second end of the seventh power switch and a first end of the eighth power switch are connected to one end of an alternating current power supply device, a second end of the eighth power switch is connected to a second bus end of the bridge arm converter 102, when the first coil is a first-phase coil L1 and the second coil comprises a second-phase coil L2 and a third-phase coil L3, the alternating current power supply device, the first-phase coil L1, the second power switch and the eighth power switch form an alternating current energy storage loop, and the alternating current power supply device, the first-phase coil L1, the first power switch and the seventh power switch can also form an alternating current energy storage loop, as an implementation mode, a current flows to a positive pole of the alternating current power supply device to flow through the first-phase coil L1, The second lower bridge arm VT2 and the eighth lower bridge arm VT8 return to the negative electrode of the direct-current power supply equipment; the alternating current power supply equipment, the first phase coil L1, the first power switch, the bus capacitor C1, an external battery and the eighth power switch form a battery charging loop, the battery charging loop is used for storing energy and enabling the motor coil to generate heat, and current flows to the anode of the alternating current power supply equipment and flows through the first phase coil L1, the first upper bridge arm VT1, the battery 105, the bus capacitor C1 and the eighth lower bridge diode VD8 to return to the cathode of the alternating current power supply equipment; the bus capacitor C1, the fifth power switch, the third phase coil L3, the second phase coil L2, the first phase coil L1 and the second power switch form a third heating circuit, current flows from one end of the bus capacitor C1 through the fifth upper arm VT5, the third phase coil L3, the first phase coil L1 and the second lower arm VT2 to the other end of the bus capacitor C1, and simultaneously current flows from one end of the bus capacitor C1 through the third upper arm VT3, the second phase coil L2, the first phase coil L1 and the second lower arm VT2 to the other end of the bus capacitor C1; a fourth heating circuit is formed by the second-phase coil L2, the third-phase coil L3, the first-phase coil L1, the first power switch, the third power switch and the fifth power switch, and circulating currents are respectively formed among the second-phase coil L2, the first-phase coil L1, the first upper bridge arm VD1 and the third upper bridge arm VT3, and among the third-phase coil L3, the first-phase coil L1, the first upper bridge diode VD1 and the fifth upper bridge arm VT5 in the current flow direction; when the first coil is a first-phase coil L1 and a second-phase coil L2, and the second coil is a third-phase coil L3, the alternating-current power supply device, the first-phase coil L1, the second-phase coil L2, the second power switch, the fourth power switch, and the eighth power switch form an alternating-current energy storage loop, the alternating-current energy storage loop is not only used for storing energy but also used for enabling the motor coil to generate heat, as an implementation manner, a current flows to a state that an anode of the alternating-current power supply device flows through the first-phase coil L1, the second lower bridge arm VT2, and the eighth lower bridge arm VT8 and returns to a cathode of the alternating-current power supply device, and meanwhile, the anode of the alternating-current power supply device flows through the second-phase coil L2, the fourth lower bridge arm VT4, and the eighth lower bridge arm VT8 and returns to the cathode of the alternating-current power supply device; the alternating-current power supply equipment, the first-phase coil L1, the second-phase coil L2, the first power switch, the third power switch, the bus capacitor 103, the external battery and the eighth power switch form a battery charging loop, the battery charging loop is not only used for storing energy but also used for heating, the current flows to the negative pole of the alternating-current power supply equipment, namely, the positive pole of the alternating-current power supply equipment flows through the first-phase coil L1, the first upper bridge arm VT1, the battery 105, the bus capacitor C1 and the eighth lower bridge diode VD8 and returns to the negative pole of the alternating-current power supply equipment, and meanwhile, the positive pole of the alternating-current power supply equipment flows through the second-phase coil L2, the second upper bridge arm VT3, the battery 105, the bus capacitor C1 and the eighth lower bridge diode VD8 and returns to the negative pole of the alternating-current power supply equipment; a bus capacitor C1, a fifth power switch, a third-phase coil L3, a second-phase coil L2, a first-phase coil L1, a second power switch and a fourth power switch form a third heating circuit, current flows from one end of the bus capacitor C1, flows through a fifth upper arm VT5, the third-phase coil L3, the first-phase coil L1 and a second lower arm VT2 and returns to the other end of the bus capacitor C1, and simultaneously, current flows from one end of a bus capacitor C1, flows through the fifth upper arm VT5, the third-phase coil L3, the second-phase coil L2 and the fourth lower arm VT4 and returns to the other end of the bus capacitor C1; the third-phase coil L3, the first-phase coil L1, the second-phase coil L2, the first power switch, the third power switch, and the fifth power switch form a fourth heating circuit, and the current flows between the third-phase coil L3, the first-phase coil L1, the first upper bridge diode VD1, and the fifth upper bridge arm VT5, and between the third-phase coil L3, the second-phase coil L2, the third upper bridge diode VD3, and the third upper bridge arm VT5, respectively, to form a circulating current.

When the first coil is a first-phase coil L1, and the second coil includes a second-phase coil L2 and a third-phase coil L3, as shown in fig. 11, in a third working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the external battery, and the zero output torque of the motor, so that the current output by the dc power supply device in the ac energy storage loop flows back to the ac power supply device through the first-phase coil L1, the second power switch, and the eighth power switch in sequence, and the current output by the bus capacitor 103 in the third heating circuit flows back to the bus capacitor 103 through the fifth power switch, the third-phase coil L3, the second-phase coil L2, the first-phase coil L1, and the second power switch in sequence, so that the ac energy storage loop and the third heating circuit work simultaneously.

As shown in fig. 12, in the fourth operation phase, the controller 104 controls the time and duration of the conduction of the first and second arms, so that the current output by the ac power supply device in the battery charging circuit flows through the first phase coil L1, the first power switch, the bus capacitor 103, the battery, the eighth power switch and flows back to the ac power supply device, the current output by the second phase coil L2 and the third phase coil L3 in the fourth heating circuit flows through the first phase coil L1, the first power switch, the third power switch and the fifth power switch and flows back to the second phase coil L2 and the third phase coil L3, and the battery charging circuit and the fourth heating circuit operate simultaneously.

When the first coil is the first phase coil L1 and the second phase coil L2, and the second coil is the third phase coil L3, as shown in fig. 13, in the third working phase, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, so that the current output by the dc power supply device in the ac energy storage loop flows back to the ac power supply device through the first phase coil L1, the second phase coil L2, the second power switch, the fourth power switch and the eighth power switch in sequence, and meanwhile, the current output by the bus capacitor 103 in the third heating circuit flows through the fifth power switch, the third phase coil L3, the first phase coil L1, the second phase coil L2, the second power switch and the fourth power switch in sequence and flows back to the bus capacitor 103, so that the alternating-current energy storage circuit and the third heating circuit work simultaneously.

As shown in fig. 14, in the fourth operation phase, the controller 104 controls the time and duration of the conduction of the first and second arms, so that the current output by the ac power supply device in the battery charging circuit flows back to the ac power supply device through the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, the bus capacitor 103, the battery, and the eighth power switch, and the current output by the third phase coil L3 in the fourth heating circuit flows back to the third phase coil L3 through the first phase coil L1, the second phase coil L2, the first power switch, the third power switch, and the fifth power switch, so that the battery charging circuit and the fourth heating circuit operate simultaneously.

An embodiment of the present application provides an energy conversion apparatus, as shown in fig. 15, the energy conversion apparatus includes:

a motor;

the vehicle-mounted charging module comprises a charging connection end group 110, wherein the charging connection end group 110 comprises a first charging connection end and a second charging connection end;

the motor control module comprises a bridge arm converter 102, and the bridge arm converter 102 is connected with a motor coil of the motor;

the energy storage module comprises a bus capacitor 103 and an energy storage connecting end group 109 which are connected in parallel, the bus capacitor 103 is connected with the bridge arm converter 102 in parallel, and the energy storage connecting end group 109 comprises a first energy storage connecting end and a second energy storage connecting end;

a controller 104 connected to the bridge arm converter 102;

the motor coil, the bridge arm converter 102 and the bus capacitor 103 form a heating and charging circuit;

the controller 104 controls the bridge arm converter 102 to make external electric energy flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery 105 and the zero output torque of the motor, and adjusts the current of the heating and charging circuit, so that the external power supply charges the battery 105, the motor coil consumes power to generate heat, and the motor outputs zero torque.

Furthermore, the first charging connecting end and the second charging connecting end are respectively connected with an external power supply, and the external battery is respectively connected with the first energy storage connecting end and the second energy storage connecting end;

the external power supply, motor coils, bridge arm inverter 102, bus capacitor 103, and battery form a heating and charging circuit.

Further, the controller 104 obtains the conduction time and duration of the bridge arm converter 102 according to the power to be heated of the motor coil, the power to be charged of the external battery 105, and the zero output torque of the motor, adjusts the current of the heating and charging circuit according to the conduction time and duration, and charges the battery while driving the motor to output the driving power through the heating and charging circuit.

Further, the external power supply is a direct current power supply device, and the working cycle of the heating and charging circuit comprises a first working phase and a second working phase; the motor coil includes a first coil and a second coil, and the bridge arm converter 102 includes a first bridge arm connected to the first coil and a second bridge arm connected to the second coil;

in the first working stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the battery 105 and the zero output torque of the motor, so that the electric energy of the direct current power supply equipment flows back to the direct current power supply equipment after passing through the first coil and the first bridge arm, and meanwhile, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the second working phase, the controller 104 controls the time and duration of the conduction of the first bridge arm and the second bridge arm, the electric energy of the dc power supply equipment flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply equipment, and meanwhile, the electric energy forms a circulating current among the second coil, the first bridge arm and the second bridge arm.

Further, in the second working phase, the controller 104 controls the time and duration of the conduction of the first bridge arm and the second bridge arm according to the power to be charged of the battery, so that the electric energy of the dc power supply equipment flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply equipment, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

Further, a start-up period of the heating and charging circuit is included before a duty cycle of the heating and charging circuit;

in a first starting stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the battery and the zero output torque of the motor, so that the electric energy of the direct current power supply equipment flows back to the direct current power supply equipment after passing through the first coil and the first bridge arm;

in the second starting stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the dc power supply equipment flows through the battery and the bus capacitor 103 after passing through the first coil and the first bridge arm and flows back to the dc power supply equipment.

Further, the charging system also comprises a bidirectional bridge arm, the bidirectional bridge arm is connected with the bridge arm converter 102 in parallel, the charging connecting end group also comprises a third charging connecting end, the bidirectional bridge arm is also connected with the controller 104 and the third charging connecting end, the third charging connecting end is connected with an external power supply, and the external power supply, the motor coil, the bridge arm converter 102, the bidirectional bridge arm, the bus capacitor 103 and the battery form a heating and charging circuit;

the controller 104 obtains the conduction time and duration of the bridge arm converter 102 according to the power to be heated of the motor coil, the charging power of the battery 105 and the zero output torque of the motor, adjusts the current of the heating and charging circuit according to the conduction time and duration, and charges the battery while driving the motor to output the driving power through the heating and charging circuit.

As an embodiment, the external power supply further includes an ac power supply device, the ac power supply device is connected to the bidirectional bridge arm, the duty cycle of the heating and charging circuit includes a third duty phase and a fourth duty phase, the motor coil includes a first coil and a second coil, the bridge arm converter 102 includes a first bridge arm connected to the first coil and a second bridge arm connected to the second coil;

in a third working stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm, or the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil, and meanwhile, the electric energy on the bus capacitor 103 flows back to the bus capacitor 103 after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller 104 controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the ac power supply equipment flows through the battery and the bus capacitor 103 after passing through the first coil, the first bridge arm and the bidirectional bridge arm and flows back to the ac power supply equipment, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the bidirectional bridge arm, the battery 105, the bus capacitor 103, the second bridge arm and the second coil, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the bidirectional bridge arm, the bus capacitor, the second bridge arm and the second coil, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

Further, in the fourth working phase, the controller 104 controls the time and duration of the conduction of the first bridge arm and the second bridge arm according to the power to be charged of the battery, so that the electric energy of the ac power supply equipment flows through the bidirectional bridge arm after passing through the first coil, the first bridge arm, the battery and the bus capacitor 103 and flows back to the ac power supply equipment, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

As another embodiment, the external power source further includes an ac power supply device, the ac power supply device is connected to the bidirectional bridge arm, the duty cycle of the heating and charging circuit includes a third duty phase and a fourth duty phase, the motor coil includes a first coil and a second coil, the bridge arm converter 102 includes a first bridge arm connected to the first coil and a second bridge arm connected to the second coil;

in a third working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor and the bidirectional bridge arm, and meanwhile, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in a fourth working phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor and the bidirectional bridge arm, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

in a third starting stage, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm or flows back to the alternating current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil;

in a fourth starting phase, the controller 104 controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the first coil, the first bridge arm, the battery and the bus capacitor and flowing back to the ac power supply equipment after flowing through the bidirectional bridge arm, or flows back to the ac power supply equipment after passing through the bidirectional bridge arm, the bus capacitor, the second bridge arm and the second coil.

In the fourth starting stage, the controller 104 controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be charged of the battery, so that the electric energy of the ac power supply equipment flows through the battery and the bus capacitor 103 after passing through the first coil, the first bridge arm and the bidirectional bridge arm and flows back to the ac power supply equipment.

To sum up, the heating and charging circuit of the energy conversion device according to the embodiment of the present disclosure controls the conduction time and the conduction duration of the bridge arm converter according to the zero output torque of the motor, the power to be charged of the external battery, and the power to be heated of the motor coil, and multiplexes the motor coil of the motor to realize the cooperative control of the motor driving, the battery charging, and the heating of the device to be heated by the motor coil.

A third embodiment of the present application provides a vehicle 10, as shown in fig. 16, further including the energy conversion device of the above embodiment.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. An energy conversion device is characterized by comprising a motor coil of a motor, a bridge arm converter, a bus capacitor connected with the bridge arm converter in parallel and a controller connected with the bridge arm converter;

the bridge arm converter is connected with the motor coil;

when the energy conversion device is connected with an external power supply through the external charging port, the controller controls the bridge arm converter to enable electric energy of the external power supply to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, and adjusts the current of the heating and charging circuit to enable the external power supply to charge the battery, enable the motor coil to consume power to generate heat and enable the motor to output the zero torque;

and the controller acquires the conduction time and duration of the bridge arm converter according to the power to be heated of the motor coil, the power to be charged of the external battery and the zero output torque of the motor, and adjusts the current of the heating and charging circuit according to the conduction time and duration.

2. The energy conversion device of claim 1, wherein the external charging port is a dc charging port, the external power source is a dc powered device, and the duty cycle of the heating and charging circuit includes a first operating phase and a second operating phase; the motor coil comprises a first coil and a second coil, and the bridge arm converter comprises a first bridge arm connected with the first coil and a second bridge arm connected with the second coil;

in the first working stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the power to be charged of the battery and the zero output torque of the motor, so that the electric energy of the direct-current power supply equipment flows back to the direct-current power supply equipment after passing through the first coil and the first bridge arm, and meanwhile, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the second working stage, the controller controls the time and duration of conduction of the first bridge arm and the second bridge arm, the electric energy of the direct current power supply equipment flows through the battery and the bus capacitor after passing through the first coil and the first bridge arm and flows back to the direct current power supply equipment, and meanwhile, circulation current is formed among the second coil, the first bridge arm and the second bridge arm.

3. The energy conversion device according to claim 2, wherein in the second operation phase, the controller controls the time and duration of conduction of the first bridge arm and the second bridge arm according to the power to be charged of the battery, so that the electric energy of the dc power supply equipment passes through the first coil and the first bridge arm, flows through the battery and the bus capacitor, and flows back to the dc power supply equipment, and meanwhile, the electric energy forms a circulating current among the second coil, the first bridge arm and the second bridge arm.

4. The energy conversion device of claim 2, further comprising a start-up period of the heating and charging circuit prior to the duty cycle of the heating and charging circuit;

the start-up cycle of the heating and charging circuit comprises a first start-up phase and a second start-up phase;

in the first starting stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the direct current power supply equipment flows back to the direct current power supply equipment after passing through the first coil and the first bridge arm;

in the second starting stage, the controller controls the conduction time and duration of the first bridge arm and the second bridge arm, so that the electric energy of the direct current power supply equipment flows through the battery and the bus capacitor after passing through the first coil and the first bridge arm and flows back to the direct current power supply equipment.

5. The energy conversion device of claim 1, further comprising a bidirectional bridge arm, the external charging port further comprising an ac charging port, the bidirectional bridge arm connected in parallel with the bridge arm converter, the bidirectional bridge arm further connected to the controller and the ac charging port, the ac charging port connected to an ac power supply, the duty cycle of the heating and charging circuit comprising a third operating phase and a fourth operating phase;

the motor coil comprises a first coil and a second coil, and the bridge arm converter comprises a first bridge arm connected with the first coil and a second bridge arm connected with the second coil;

in the third working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm or flows back to the alternating current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil, and meanwhile, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after flowing through the first coil, the first bridge arm, the battery and the bus capacitor and flowing through the bidirectional bridge arm, or the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after flowing through the bidirectional bridge arm, the bus capacitor, the second bridge arm and the second coil, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

6. The energy conversion device according to claim 5, wherein in the fourth operating phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm, and the bidirectional bridge arm according to the charging power of the battery, so that the electric energy of the ac power supply equipment flows back to the ac power supply equipment after flowing through the first coil, the first bridge arm, the battery, and the bus capacitor and flowing through the bidirectional bridge arm, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after flowing through the bidirectional bridge arm, the bus capacitor, the second bridge arm, and the second coil, and meanwhile, the electric energy forms a circulating current among the second coil, the first bridge arm, and the second bridge arm.

7. The energy conversion device of claim 1, further comprising a bidirectional bridge arm, the external charging port further comprising an ac charging port, the bidirectional bridge arm connected in parallel with the bridge arm converter, the bidirectional bridge arm further connected to the controller and the ac charging port, the ac charging port connected to an ac power supply, the duty cycle of the heating and charging circuit comprising a third operating phase and a fourth operating phase;

in the third working stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor and the bidirectional bridge arm, and meanwhile, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor and the bidirectional bridge arm, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

8. The energy conversion device according to claim 7, wherein in the fourth operating phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm, and the bidirectional bridge arm according to the charging power of the battery, so that the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor, and the bidirectional bridge arm, or the electric energy of the ac power supply equipment flows back to the ac power supply equipment after passing through the bidirectional bridge arm, the bus capacitor, the second bridge arm, and the second coil, and meanwhile, the electric energy forms a circulating current among the second coil, the first bridge arm, and the second bridge arm.

9. The energy conversion device of claim 5 or 7, further comprising a start-up period of the heating and charging circuit prior to the duty cycle of the heating and charging circuit;

in the third starting stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, so that the electric energy of the alternating current power supply equipment flows back to the alternating current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm or flows back to the alternating current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil;

in the fourth starting stage, the controller controls the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm, the battery, the bus capacitor and the bidirectional bridge arm, or flows back to the alternating-current power supply equipment after passing through the bidirectional bridge arm, the bus capacitor, the second bridge arm and the second coil.

10. An energy conversion device, characterized in that the energy conversion device comprises:

a motor;

a controller connected to the bridge arm converter;

the controller controls the bridge arm converter to enable external electric energy to flow to the heating and charging circuit according to the power to be heated of the motor coil, the power to be charged of an external battery and the zero output torque of the motor, adjusts the current of the heating and charging circuit, enables an external power supply to charge the battery, enables the motor coil to consume power to generate heat and enables the motor to output the zero torque;

11. The energy conversion device of claim 10, wherein said first charging connection and said second charging connection are each connected to an external power source, and wherein an external battery is connected to said first energy storage connection and said second energy storage connection;

the external power supply, the motor coil, the bridge arm converter, the bus capacitor and the battery form a heating and charging circuit.

12. The energy conversion device of claim 10, wherein the external power source is a dc powered device, and the duty cycle of the heating and charging circuit includes a first operating phase and a second operating phase; the motor coil comprises a first coil and a second coil, and the bridge arm converter comprises a first bridge arm connected with the first coil and a second bridge arm connected with the second coil;

13. The energy conversion device according to claim 12, further comprising a bidirectional bridge arm, the bidirectional bridge arm being connected in parallel with the bridge arm converter, the set of charging connection terminals further comprising a third charging connection terminal, the bidirectional bridge arm further being connected to the controller and the third charging connection terminal, the third charging connection terminal being connected to an external power supply, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bus capacitor, and the battery forming a heating and charging circuit;

the controller obtains the conduction time and duration of the bridge arm converter according to the power to be heated of the motor coil, the charging power of the battery and the zero output torque of the motor, and adjusts the current of the heating and charging circuit according to the conduction time and duration, so that the external power supply charges the battery, the motor coil consumes power to generate heat, and the motor outputs zero torque.

14. The energy conversion arrangement according to claim 13, wherein the external power source is an ac power supply device connected to the bidirectional leg, the duty cycle of the heating and charging circuit includes a third duty cycle and a fourth duty cycle, the motor coil includes a first coil and a second coil, the leg converter includes a first leg connected to the first coil and a second leg connected to the second coil;

in the third working stage, the controller makes the electric energy of the alternating-current power supply equipment flow back to the alternating-current power supply equipment after passing through the first coil, the first bridge arm and the bidirectional bridge arm or makes the electric energy of the alternating-current power supply equipment flow back to the alternating-current power supply equipment after passing through the bidirectional bridge arm, the second bridge arm and the second coil according to the power to be heated of the motor coil, the charging power of the battery and the conduction time and duration of the first bridge arm, the second bridge arm and the bidirectional bridge arm of zero output torque of the motor, and at the same time, the electric energy on the bus capacitor flows back to the bus capacitor after passing through the second bridge arm, the second coil, the first coil and the first bridge arm;

in the fourth working phase, the controller controls the time and duration of conduction of the first bridge arm, the second bridge arm and the bidirectional bridge arm, so that the electric energy of the alternating-current power supply equipment flows back to the alternating-current power supply equipment after flowing through the first coil, the first bridge arm, the battery and the bus capacitor and flowing through the bidirectional bridge arm or flows back to the alternating-current power supply equipment after flowing through the bidirectional bridge arm, the bus capacitor, the second bridge arm and the second coil, and meanwhile, a circulating current is formed among the second coil, the first bridge arm and the second bridge arm.

15. The energy conversion arrangement according to claim 13, wherein the external power source is an ac power supply device connected to the bidirectional leg, the duty cycle of the heating and charging circuit includes a third duty cycle and a fourth duty cycle, the motor coil includes a first coil and a second coil, the leg converter includes a first leg connected to the first coil and a second leg connected to the second coil;

16. A vehicle characterized by further comprising the energy conversion apparatus of any one of claims 1 to 15.