CN213367628U

CN213367628U - Direct current bus charging and discharging integrated circuit and electrical equipment

Info

Publication number: CN213367628U
Application number: CN202022660404.7U
Authority: CN
Inventors: 刘小高; 姜颖异; 郭泳颖; 付鹏亮; 徐志国
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-06-04
Anticipated expiration: 2030-11-17

Abstract

The disclosure relates to a direct current bus charging and discharging integrated circuit and electrical equipment. This integrative circuit of direct current bus charge-discharge includes: a charging circuit and a discharging circuit, wherein: the charging circuit comprises three charging branches, a first switch and a main power device, wherein a charging resistor is connected in series in each charging branch; the discharge circuit comprises a second switch; and in the discharging state of the direct current bus, at least one of the three charging resistors is connected in series with the direct current bus. This openly adopts direct current bus charge-discharge integral type design, and the discharge resistance uses when discharging as the charging resistance when starting to guarantee equipment and personnel's safety, reduced structure complexity, improved equipment power density.

Description

Direct current bus charging and discharging integrated circuit and electrical equipment

Technical Field

The disclosure relates to the field of power electronics, in particular to a direct-current bus charging and discharging integrated circuit and electrical equipment.

Background

In the related technology, in the fields of high-power inverters, converters, frequency converters and the like, before a main power device is electrified, a bus capacitor needs to be charged, and the related technology is generally applied to a high-power resistor in the industry at present to finish the work. When the unit is in power-down maintenance and test, the capacitor needs to be discharged due to the existence of the direct-current supporting capacitor, and the discharging mode commonly applied in the prior art is also commonly a high-power and large-resistance resistor.

Disclosure of Invention

The inventor finds out through research that: in the related technology, the high-power and high-resistance resistor is adopted to discharge the direct current bus capacitor, and the design has a complicated internal structure, is not beneficial to the improvement of power density and has low discharge speed.

In view of at least one of the above technical problems, the present disclosure provides a dc bus charging and discharging integrated circuit and an electrical device, which adopt a dc bus charging and discharging integrated design, and use a charging resistor at startup as a discharging resistor at discharging.

According to an aspect of the present disclosure, a dc bus charging and discharging integrated circuit is provided, including a charging circuit and a discharging circuit, wherein:

the charging circuit comprises three charging branches, a first switch and a main power device, wherein a charging resistor is connected in series in each charging branch;

the discharge circuit comprises a second switch;

and in the discharging state of the direct current bus, at least one of the three charging resistors is connected in series with the direct current bus.

In some embodiments of the present disclosure, the dc bus charging and discharging integrated circuit further includes a three-phase ac power supply, wherein:

each phase line of the three-phase alternating-current power supply is connected with a corresponding charging branch through a first switch, and the three charging branches are connected with the main power device respectively;

and the charging circuit is used for charging the direct current bus capacitor through the three charging branches and the main power device.

In some embodiments of the present disclosure, the discharge circuit includes a first connection terminal, a second connection terminal, a third connection terminal, and a fourth connection terminal, wherein:

the first connecting end and the second connecting end of the discharge circuit are respectively connected with two ends of the direct current bus capacitor;

and the third connecting end and the fourth connecting end of the discharge circuit are used for connecting at least one of the three charging resistors in series into the direct current bus through the first switch in a direct current bus discharge state.

In some embodiments of the present disclosure, a second switch is disposed between the first connection terminal and the third connection terminal of the discharge circuit, and a second switch is disposed between the second connection terminal and the third connection terminal of the discharge circuit.

In some embodiments of the present disclosure, the second switch is a two-pole switch.

In some embodiments of the present disclosure, in case of power failure of the electrical apparatus, the three-phase ac power supply is powered down, the first switch and the second switch are closed, at least one of the three charging resistors is connected in series to the dc bus, and the three-phase ac power supply is disconnected from the three charging branches;

and the discharging circuit is used for discharging the direct current bus capacitor through at least one of the three charging resistors.

In some embodiments of the present disclosure, when the electrical apparatus is powered on and in a normal operating state or a state to be charged, the three-phase ac power supply is powered on, the first switch is closed, the second switch is opened, the first switch is disconnected from the dc bus, the three-phase ac power supply is disconnected from the three charging branches, and the dc bus is in a normal operating state or a state to be charged.

In some embodiments of the present disclosure, when the electrical equipment is in a charging state, the three-phase ac power source is in a power-on state, the first switch is turned off, the second switch is turned off, the first switch is disconnected from the dc bus, the three-phase ac power source is connected to the three charging branches, and the electrical equipment is in a charging state;

In some embodiments of the present disclosure, the first switch and the second switch are both normally closed relays.

In some embodiments of the present disclosure, the dc bus charging and discharging integrated circuit further includes a controller, wherein:

the controller is connected with the control coil of the first switch; and the three-phase alternating current power supply is connected with the control coil of the second switch.

In some embodiments of the present disclosure, the first switch comprises a first sub-switch, a second sub-switch, and a third sub-switch, wherein:

a first phase line of the three-phase alternating-current power supply is connected with a first end of a first charging resistor through a first branch switch, and a second end of the first charging resistor is connected with a main power device;

a second phase line of the three-phase alternating-current power supply is connected with a first end of a second charging resistor through a second tap switch, and a second end of the second charging resistor is connected with the main power device;

and a third phase line of the three-phase alternating-current power supply is connected with a first end of a third charging resistor through a first branch switch, and a second end of the third charging resistor is connected with the main power device.

In some embodiments of the present disclosure, the first switch is a four-pole, double-throw switch;

the first switch further comprises a fourth switch, wherein:

a first phase line of the three-phase alternating-current power supply is connected with a first end of the first branch switch, a second end of the first branch switch is connected with a third connecting end of the discharging circuit, and a third end of the first branch switch is connected with a first end of the first charging resistor;

the second end of the first charging resistor is connected with the second end of the second shunt switch, the second phase line of the three-phase alternating-current power supply is connected with the first end of the second shunt switch, and the third end of the second shunt switch is connected with the first end of the second charging resistor;

the second end of the second charging resistor is connected with the third end of the fourth switch, and the second end of the fourth switch is connected with the second end of the third charging resistor;

the first end of the third charging resistor is connected with the third end of the third shunt switch, the second end of the third shunt switch is connected with the fourth connecting end of the discharging circuit, and the first end of the third shunt switch is connected with the third phase line of the three-phase alternating-current power supply.

In some embodiments of the present disclosure, the first switch is a three pole, double throw switch, wherein:

a first phase line of the three-phase alternating-current power supply is connected with a first end of the first branch switch, a second end of the first branch switch is connected with a fourth connecting end of the discharging circuit, a third end of the first branch switch is connected with a first end of the first charging resistor, and a second end of the first charging resistor is connected with a third connecting end of the discharging circuit;

a second phase line of the three-phase alternating-current power supply is connected with a first end of a second shunt switch, and a third end of the second shunt switch is connected with a first end of a second charging resistor;

and a third phase line of the three-phase alternating-current power supply is connected with a first end of a third shunt switch, and a third end of the third shunt switch is connected with a first end of a third charging resistor.

the first switch further comprises a fourth switch, wherein:

a second phase line of the three-phase alternating-current power supply is connected with a first end of a second shunt switch, a second end of the second shunt switch is connected with a second end of a first charging resistor, a third end of the second shunt switch is connected with a first end of a second charging resistor, a second end of the second charging resistor is connected with a third end of a fourth shunt switch, and a second end of the fourth shunt switch is connected with a fourth connecting end of the discharging circuit;

According to another aspect of the present disclosure, an electrical device is provided, which includes the dc bus charging and discharging integrated circuit according to any one of the embodiments.

This openly adopts direct current bus charge-discharge integral type design, and the discharge resistance uses when discharging as the charging resistance when starting to guarantee equipment and personnel's safety, reduced structure complexity, improved equipment power density.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of some embodiments of related art charging and discharging circuits.

Fig. 2 is a schematic diagram of some embodiments of the dc bus charging and discharging integrated circuit of the present disclosure.

Fig. 3 is a schematic diagram of a normal operating state or a state to be charged of the dc bus charging and discharging integrated circuit according to some embodiments of the disclosure.

Fig. 4 is a schematic diagram of a charging state of the dc bus charging and discharging integrated circuit according to some embodiments of the disclosure.

Fig. 5 is a schematic diagram of another embodiment of the charging and discharging integrated circuit for the dc bus according to the disclosure.

Fig. 6 is a schematic diagram of some further embodiments of the dc bus charging and discharging integrated circuit of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

FIG. 1 is a schematic diagram of some embodiments of related art charging and discharging circuits. As shown in fig. 1, when the unit is turned on, the dc bus capacitors of the high-power variable-frequency converter and the inverter need to be precharged through the high-power charging resistors R1-R3 and the main power device. A circuit is designed after the power failure of the unit, and the bus capacitor is discharged through the high-power large-resistance discharge resistor R4. In particular, R1-R3 generally use low-resistance high-power resistors, such as a single resistor of 80 ohms/300W rated power; since R4 is always in a charged working state, in order to reduce the heating power, a relatively large-resistance resistor, such as a resistor with a voltage of 15K ohms/rated power of 300W, is commonly used.

Through research, the applicant finds that the charge and discharge circuit shown in fig. 1 in the related art increases the redundancy of the product structure, reduces the power density of the product, and affects the safety of the product.

In view of at least one of the above technical problems, the present disclosure provides a dc bus charging and discharging integrated circuit and an electrical device, which are described below with specific embodiments.

Fig. 2 is a schematic diagram of some embodiments of the dc bus charging and discharging integrated circuit of the present disclosure. As shown in fig. 2, the dc bus charging and discharging integrated circuit of the present disclosure may include a charging circuit 2 and a discharging circuit 4, where:

the charging circuit 2 comprises three charging

branches

21, 22, 23, a first switch K1 and a main power device 1, wherein a charging resistor R1, R2, R3 is connected in series in each charging

branch

21, 22, 23.

In some embodiments of the present disclosure, as shown in fig. 2, the first charging branch 21 is connected in series to the first charging resistor R1, and the second charging branch 22 is connected in series to the second charging resistor R2; the third charging branch 23 is connected in series with a third charging resistor R3.

In some embodiments of the present disclosure, the charging resistors R1-R3 are low-resistance high-power resistors, such as a single resistor with a resistance of 80 ohms/300W power rating.

In some embodiments of the present disclosure, as shown in fig. 2, the discharge circuit 4 includes a second switch K2. In the discharging state of the direct current bus, at least one of the three charging resistors R1, R2 and R3 is connected in series with the direct current bus to discharge the direct current bus capacitor C.

In some embodiments of the present disclosure, as shown in fig. 2, the dc bus charging and discharging integrated circuit may further include a three-phase ac power supply 3, where:

each of the phase lines A, B and C of the three-phase ac power supply 3 is connected to a corresponding charging

branch

21, 22, 23 via a first switch K1, and the three charging

branches

21, 22, 23 are connected to the main power device 1.

And a charging circuit 2 for charging the dc bus capacitance C through the three charging

branches

21, 22, 23 and the main power device 1.

In some embodiments of the present disclosure, as shown in fig. 2, the discharge circuit 4 may include a first connection terminal 41, a second connection terminal 42, a third connection terminal 43, and a fourth connection terminal 44, wherein:

the first connection end 41 and the second connection end 42 of the discharge circuit 4 are respectively connected with two ends of the dc bus capacitor C.

The third connection terminal 43 and the fourth connection terminal 44 of the discharge circuit 4 are configured to connect at least one of the charging resistors R1, R2, and R3 in series to the dc bus via the first switch K1 in a discharging state of the dc bus.

In some embodiments of the present disclosure, as shown in fig. 2, the second switch K2 may be a double pole double throw switch.

In some embodiments of the present disclosure, as shown in fig. 2, a second switch K2 is disposed between the first connection terminal 41 and the third connection terminal 43 of the discharge circuit 4, and a second switch K2 is disposed between the second connection terminal 42 and the third connection terminal 43 of the discharge circuit 4.

In some embodiments of the present disclosure, as shown in fig. 2, in the event of power failure of the electrical apparatus, the three-phase ac power supply 3 is powered down, the first switch K1 and the second switch K2 are closed, at least one of the charging resistors R1, R2, R3 is connected in series to the dc bus, and the three-phase ac power supply 3 is disconnected from the three charging

branches

21, 22, 23.

And the discharging circuit 4 is used for discharging the direct current bus capacitor C through at least one of the charging resistors R1, R2 and R3.

In some embodiments of the present disclosure, as shown in fig. 2, the first switch K1 and the second switch K2 may each be a normally closed relay.

In some embodiments of the present disclosure, as shown in fig. 2, the first switch K1 may be a four-pole, double-throw switch.

In some embodiments of the present disclosure, the dc bus charging and discharging integrated circuit may further include a controller 6, where:

the controller 6 is connected with a control coil K11 of the first switch K1; the three-phase ac power supply 3 is connected to the control coil K21 of the second switch K2.

In some embodiments of the present disclosure, as shown in fig. 2, the first switch K1 may include a first sub switch 51, a second sub switch 52, and a third sub switch 53, wherein:

the first phase line a of the three-phase ac power supply 3 is connected to a first end of a first charging resistor through a first branch switch 51, and a second end of the first charging resistor is connected to the main power device 1.

A second phase line of the three-phase ac power supply 3 is connected to a first end of a second charging resistor through a second tap 52, and a second end of the second charging resistor is connected to the main power device 1.

The third phase line of the three-phase ac power supply 3 is connected to the first end of the third charging resistor through the first branch switch 51, and the second end of the third charging resistor is connected to the main power device 1.

In some embodiments of the present disclosure, as shown in fig. 2, the first switch K1 may further include a fourth switch 54, wherein:

the first phase line a of the three-phase ac power supply 3 is connected to the first end of the first switch 51, the second end of the first switch 51 is connected to the third connection end 43 of the discharge circuit 4, and the third end of the first switch 51 is connected to the first end of the first charging resistor.

The second end of the first charging resistor is connected to the second end of the second switch 52, the second phase line B of the three-phase ac power supply 3 is connected to the first end of the second switch 52, and the third end of the second switch 52 is connected to the first end of the second charging resistor.

The second terminal of the second charging resistor is connected to the third terminal of the fourth switch 54, and the second terminal of the fourth switch 54 is connected to the second terminal of the third charging resistor.

A first end of the third charging resistor is connected to the third end of the third switch 53, a second end of the third switch 53 is connected to the fourth connection terminal 44 of the discharging circuit 4, and a first end of the third switch 53 is connected to the third phase line C of the three-phase ac power supply 3.

In some embodiments of the present disclosure, as shown in fig. 2, the first end of each of the first, second, third, fourth and second sub-switches 51, 52, 53, 54 and 54 of the first switch K1 is a main normally open contact, the second end of the sub-switch is a main normally closed contact, and the third end of the sub-switch is a constant connection terminal (i.e., a handle-side terminal).

The embodiment of fig. 2 provides a schematic diagram of a discharge state of a charging and discharging integrated circuit of a direct current bus in some embodiments of the present disclosure. As shown in fig. 2, after the electrical equipment is powered down, the A, B, C phases on the three-phase alternating current side are powered down, the control coils K11 and K21 of the relays K1 and K2 are in a non-control state, and the main contacts are all at main normally closed contacts; at the moment, the second switch K2 enables the direct-current bus to be connected to a main normally closed contact of K1, the main normally closed contact of K1 enables charging resistors R1, R2 and R3 to be connected in series and then connected to the direct-current bus, the charging resistors R1, R2 and R3 quickly consume the stored electric energy in the direct-current bus capacitor C, and the direct-current bus quick discharging function after the power failure of the electrical equipment is achieved.

Fig. 3 is a schematic diagram of a normal operating state or a state to be charged of the dc bus charging and discharging integrated circuit according to some embodiments of the disclosure. As shown in fig. 3, when the electrical equipment is powered on and is in a normal operating state or a standby state, the three-phase ac side A, B, C is powered on, the second switch K2 controls the coil to be powered on and off, so as to disconnect the dc bus from the first switch K1, and the three-phase ac power supply 3 and the three charging

branches

21, 22, and 23 are still disconnected, so that the dc bus enters the standby state of normal operation or standby state.

Fig. 4 is a schematic diagram of a charging state of the dc bus charging and discharging integrated circuit according to some embodiments of the disclosure. As shown in fig. 4, after the electrical equipment completes initialization, the controller 6 controls the control coil K11 of the first switch K1 to close the main normally open contact, the electrical equipment enters a charging state, the three-phase ac power supply 3 is in a power-on state, the first switch K1 is open, the second switch K2 is open, the first switch K1 is disconnected from the dc bus, the three-phase ac power supply 3 is connected with the three charging

branches

21, 22, and 23, and the electrical equipment is in the charging state; and a charging circuit 2 for charging the dc bus capacitance C through the three charging

branches

21, 22, 23 and the main power device 1. In the above embodiments of the present disclosure, during the normal charging process, after the three-phase ac power passes through the charging resistors R1-R3, the three-phase rectifier bridge in the main power device 1 rectifies the three-phase ac power into dc power to charge the dc bus capacitor.

After the electrical equipment is charged, the controller 6 controls the control coil K11 of the K1 to be disconnected, the K1 normally open contact is disconnected, and the electrical equipment enters a charging completion state.

The direct-current bus charging and discharging integrated circuit provided by the embodiment of the disclosure can be applied to electrical equipment such as a high-power inverter, a converter, a frequency converter and a rectifier. The charging and discharging integrated circuit of the direct current bus realizes the multiplexing of the charging resistor through the relay, and realizes the charging and discharging integrated function through one set of power resistor device.

According to the above embodiment of the disclosure, through the integrated design of the charging and discharging circuit systems, the high-power and high-resistance charging resistor in the product does not exist any more, the charging resistor and the structural space thereof do not exist any more, and the structure, the cabinet volume, the electrical safety, the overhaul and the like of the product are all beneficially improved.

The above-mentioned embodiments of the present disclosure employ charging resistors R1-R3 having lower resistance than the high-power, high-resistance discharging resistor R4 of the related art, such as in fig. 1.

The related art discharge resistor (for example, the discharge resistor R4 in the embodiment of fig. 1) itself occupies more than 5 times of the space occupied by the relays K1 and K2 added in the present application, and since the dc bus voltage is usually hundreds or even thousands of volts, a sufficient space distance is left between the exposed discharge resistor and other devices. Therefore, after the discharge resistor is eliminated in the embodiment of the disclosure, the space occupied by the discharge resistor does not exist originally, and the product volume can be made smaller under the same power. Therefore, the power density of the product is greatly improved by the embodiment of the disclosure.

In the system architecture with the discharge resistor R4 in the related art, the structure needs to consider the position space, the insulation distance, the temperature rise, and the like of the discharge resistor, and the above embodiments of the present disclosure do not need to consider any more after the discharge resistor is eliminated, so that the above embodiments of the present disclosure reduce the system redundancy.

The direct-current bus voltage is hundreds of volts or even thousands of volts, the large-resistance discharge resistor in the related technology needs heat dissipation and is generally exposed in the cabinet body, the requirement on electrical insulation is high, the discharge resistor works for a long time and the temperature is high, so that the aging of a nearby circuit insulating layer is accelerated, and the falling of an antirust coating of the cabinet body is accelerated.

According to the embodiment of the invention, the independently arranged discharge resistor is not used, the exposed high-voltage devices in the cabinet body are reduced, the structural insulation to be considered is also reduced, once the system is powered down, the three-phase alternating current main line is powered down, the K2 is in a normally closed state, and the direct current bus capacitor is forcibly and rapidly discharged, so that the safety of the product is greatly improved.

While the prior art discharge resistor has a resistance of several tens of kilo-ohms (for example, the discharge resistor R4 in the embodiment of fig. 1 is 15K ohms), and the discharge time is generally over ten minutes, the above embodiments of the present disclosure discharge by using a charging resistor, and the charging resistor has a resistance of several hundreds of ohms (for example, the sum of the charging resistors R1-R3 in the embodiment of fig. 1 is 240 ohms), so that several tens of milli-meters of dc bus capacitors can be discharged to below the safe voltage within one minute. Therefore, the charging and discharging integrated circuit of the embodiment of the disclosure greatly accelerates the discharging speed and reduces the maintenance waiting time.

The above embodiments of the present disclosure also greatly reduce the hardware cost of the charging and discharging circuit.

Fig. 5 is a schematic diagram of another embodiment of the charging and discharging integrated circuit for the dc bus according to the disclosure. Compared with the integrated dc bus charging and discharging circuit of the embodiment of fig. 2, in the integrated dc bus charging and discharging circuit of the embodiment of fig. 5, the charging circuit 2 has the same structure as the charging circuit of the embodiment of fig. 2. The difference between the discharge circuit 2 in the embodiment of fig. 5 and the discharge circuit of fig. 2 is that: in the discharging state of the direct current bus, one of the three charging resistors R1, R2 and R3 is connected in series to the direct current bus.

Specifically, in the embodiment of fig. 5, in the discharging state of the dc bus, the first charging resistor R1 is connected in series to the dc bus to discharge the dc bus capacitor C.

In some embodiments of the present disclosure, as shown in fig. 5, the first switch K1 is a three-pole-double-throw switch, and the first switch K1 may include a first sub-switch 51, a second sub-switch 52, and a third sub-switch 53, wherein:

the first phase line a of the three-phase ac power supply 3 is connected to the first end of the first branch switch 51, the second end of the first branch switch 51 is connected to the fourth connection end 44 of the discharge circuit 4, the third end of the first branch switch 51 is connected to the first end of the first charging resistor, and the second end of the first charging resistor is connected to the third connection end 43 of the discharge circuit 4.

The second phase line B of the three-phase ac power supply 3 is connected to the first end of the second switch 52, and the third end of the second switch 52 is connected to the first end of the second charging resistor.

The third phase line C of the three-phase ac power supply 3 is connected to the first terminal of the third disconnecting switch 53, and the third terminal of the third disconnecting switch 53 is connected to the first terminal of the third charging resistor.

Fig. 6 is a schematic diagram of some further embodiments of the dc bus charging and discharging integrated circuit of the present disclosure. Compared with the dc bus charging and discharging integrated circuit of the embodiment of fig. 2 and 5, in the dc bus charging and discharging integrated circuit of the embodiment of fig. 6, the charging circuit 2 has the same structure as the charging circuit of the embodiment of fig. 2 and 5. The difference between the discharge circuit 2 in the embodiment of fig. 6 and the discharge circuits of fig. 2 and 5 is that: in the discharging state of the direct current bus, two of the three charging resistors R1, R2 and R3 are connected in series to the direct current bus.

Specifically, in the embodiment of fig. 6, in the discharging state of the dc bus, the first charging resistor R1 and the second charging resistor R2 are connected in series to the dc bus, so as to discharge the dc bus capacitor C.

In some embodiments of the present disclosure, as shown in fig. 6, the first switch K1 is a four-pole double-throw switch, and the first switch K1 may include a first sub-switch 51, a second sub-switch 52, a third sub-switch 53, and a fourth sub-switch 54, wherein:

the first phase line a of the three-phase ac power supply 3 is connected to the first end of the first switch 51, the second end of the first switch 51 is connected to the third connection end 43 of the discharge circuit 4, and the third end of the first switch 51 is connected to the first end of the first charging resistor R1.

The second phase line B of the three-phase ac power supply 3 is connected to the first end of the second switch 52, the second end of the second switch 52 is connected to the second end of the first charging resistor R1, the third end of the second switch 52 is connected to the first end of the second charging resistor, the second end of the second switch 52 is connected to the third end of the fourth switch 54, and the second end of the fourth switch 54 is connected to the fourth connection terminal 44 of the discharging circuit 4.

The charging and discharging integrated circuit of the direct current bus realizes the multiplexing of the charging resistor through the relay, and realizes the charging and discharging integrated function through one set of power resistor device.

The embodiment of fig. 5 and 6 connects one or two charging resistors in series to the discharging circuit, so that the charging and discharging integrated circuit of the above embodiment of the present disclosure further accelerates the discharging speed and reduces the maintenance waiting time.

After the discharge resistor is eliminated in the embodiment of the disclosure, the space occupied by the discharge resistor does not exist originally, and the product volume can be smaller under the same power. Therefore, the power density of the product is greatly improved by the embodiment of the disclosure.

According to another aspect of the present disclosure, an electrical device is provided, which includes the dc bus charging and discharging integrated circuit according to any one of the embodiments (for example, any one of fig. 2 to 6).

In some embodiments of the present disclosure, the electrical devices of the present disclosure may be electrical devices such as high power inverters, converters, frequency converters, rectifiers, and the like.

Based on the electrical equipment provided by the above embodiment of the present disclosure, the direct current bus charging and discharging integrated circuit is adopted to realize the multiplexing of the charging resistor through the relay, and the charging and discharging integrated function is realized through one set of power resistor device.

The charging and discharging integrated circuit of the embodiment of the disclosure greatly accelerates the discharging speed and reduces the maintenance waiting time. The above embodiments of the present disclosure also greatly reduce the hardware cost of the charging and discharging circuit.

The controllers described above may be implemented as a general purpose processor, a programmable logic controller 6(PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof, for performing the functions described herein.

Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware to implement the above embodiments, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.

The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a direct current bus charging and discharging integrative circuit which characterized in that, includes charging circuit and discharge circuit, wherein:

the discharge circuit comprises a second switch;

2. The integrated charging and discharging circuit for the direct-current bus according to claim 1, further comprising a three-phase alternating-current power supply, wherein:

3. The integrated charging and discharging circuit for the direct current bus according to claim 1, wherein the discharging circuit comprises a first connection end, a second connection end, a third connection end and a fourth connection end, wherein:

4. The direct current bus charging and discharging integrated circuit according to claim 3,

a second switch is arranged between the first connecting end and the third connecting end of the discharge circuit, and a second switch is arranged between the second connecting end and the third connecting end of the discharge circuit;

the second switch is a double-pole switch.

5. The direct current bus charging and discharging integrated circuit according to any one of claims 1 to 4,

under the condition that the electrical equipment is powered off, the three-phase alternating current power supply is powered off, the first switch and the second switch are closed, at least one of the three charging resistors is connected in series with the direct current bus, and the three-phase alternating current power supply is disconnected with the three charging branches;

6. The direct current bus charging and discharging integrated circuit according to any one of claims 1 to 4,

when the electrical equipment is powered on and is in a normal working state or a state to be charged, the three-phase alternating-current power supply is powered on, the first switch is closed, the second switch is disconnected, the first switch is disconnected from the direct-current bus, the three-phase alternating-current power supply is disconnected from the three charging branches, and the direct-current bus is in a normal working state or a state to be charged.

7. The direct current bus charging and discharging integrated circuit according to any one of claims 1 to 4,

under the condition that the electrical equipment is in a charging state, the three-phase alternating-current power supply is in a power-on state, the first switch is disconnected, the second switch is disconnected, the first switch is disconnected from the direct-current bus, the three-phase alternating-current power supply is conducted with the three charging branches, and the electrical equipment is in the charging state;

8. The direct current bus charging and discharging integrated circuit according to any one of claims 1-4, wherein the first switch and the second switch are both normally closed relays.

9. The integrated charging and discharging circuit for the direct current bus according to claim 8, further comprising a controller, wherein:

10. The integrated charging and discharging circuit for the direct current bus according to claim 9, wherein the first switch comprises a first branch switch, a second branch switch and a third branch switch, and wherein:

11. The integrated charging and discharging circuit for the direct current bus according to claim 10, wherein the first switch is a four-pole double-throw switch;

the first switch further comprises a fourth switch, wherein:

12. The dc bus charging and discharging integrated circuit according to claim 10, wherein the first switch is a three-pole double-throw switch, wherein:

13. The integrated charging and discharging circuit for the direct current bus according to claim 10, wherein the first switch is a four-pole double-throw switch;

the first switch further comprises a fourth switch, wherein:

14. An electrical device comprising the dc bus charging and discharging integrated circuit according to any one of claims 1 to 13.