CN214850968U - Driving device and motor system of bridgeless PFC power supply - Google Patents

Abstract

The utility model discloses a drive arrangement and motor system of no bridge PFC power, the device includes: any one of the first inductance module, the second inductance module and the third inductance module is charged by first alternating current input from an alternating current power supply under the condition that a charging loop of the inductance module is switched on; the control unit controls a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be connected according to the current of the first alternating current; and the bus capacitor unit is used for storing the electric energy obtained by charging the at least one inductance module to obtain direct current under the condition that the charging loop of the at least one inductance module is switched on and charged. According to the scheme, the three paths of bridgeless PFC circuits driven in a staggered parallel mode are arranged, and the on-state loss of the PFC circuits can be reduced.

Description

Driving device and motor system of bridgeless PFC power supply

Technical Field

The utility model belongs to the technical field of the power, concretely relates to drive arrangement, motor system of no bridge PFC power and drive arrangement's of no bridge PFC power control method especially relates to the crisscross parallel drive circuit of three routes of a no bridge PFC circuit, has the crisscross parallel drive circuit's of three routes motor system of no bridge PFC circuit and the crisscross parallel drive circuit's of three routes control method of no bridge PFC circuit.

Background

In the related scheme, a frequency converter of a driving motor (such as a motor in a compressor) adopts an alternating-direct-alternating frequency technology (namely, an alternating-direct-alternating frequency technology). In the ac-dc-ac frequency conversion technology, 220V voltage is input in a single phase, ac is converted into 310V dc voltage through a rectifier, the dc bus voltage approaches 380V after passing through a PFC (power factor correction) circuit, and the dc bus voltage is provided to a fan IPM (intelligent power module) module and a compressor IPM module, so that coordinated control of a fan, a compressor, a valve body and the like is realized. However, in the ac-dc-ac frequency conversion technology, the PFC circuit has a disadvantage of large on-state loss.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a drive arrangement and motor system of no bridge PFC power to solve in the alternating current-direct current technique of changing frequently, the PFC circuit has the big problem of on-state loss, reaches the no bridge PFC circuit through setting up the crisscross parallel drive of three routes, can reduce the effect of the on-state loss of PFC circuit.

The utility model provides a drive arrangement of no bridge PFC power, include: the charging unit, the control unit and the bus capacitor unit; the charging unit includes: the inductor comprises a first inductor module, a second inductor module and a third inductor module; any one of the first inductance module, the second inductance module and the third inductance module is configured to receive a first alternating current input from an alternating current power supply, and charge the inductance module by using the first alternating current input from the alternating current power supply when a charging loop of the inductance module is switched on; the control unit is configured to control a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on according to the current magnitude of a first alternating current input from an alternating current power supply; the bus capacitor unit is configured to store electric energy obtained by charging at least one of the first inductor module, the second inductor module and the third inductor module when a charging loop of at least one of the first inductor module, the second inductor module and the third inductor module is connected and charged, so as to obtain direct current.

In some embodiments, further comprising: an inversion unit; the inversion unit is configured to invert the direct current stored in the bus capacitor unit to obtain a second alternating current required by the operation of the equipment to be powered.

In some embodiments, the control unit comprises: a control module; the control module includes: the first switch tube module, the second switch tube module, the third switch tube module, the fourth switch tube module, the fifth switch tube module and the sixth switch tube module, and the first direction module and the second direction module; each switching tube module can form a charging loop with one inductance module and the positive half cycle or the negative half cycle of the alternating current power supply; the first direction module is arranged between an input port of the alternating current power supply and the second switching tube module, the fourth switching tube module and the fifth switching tube module, and can be conducted to the input port of the alternating current power supply by any one of the second switching tube module, the fourth switching tube module and the fifth switching tube module; the second direction module is arranged at the input port of the alternating current power supply, the first switch tube module, the third switch tube module and the sixth switch tube module are arranged between the first switch tube module and the sixth switch tube module, and the input port of the alternating current power supply can be communicated with any switch tube module in the first switch tube module, the third switch tube module and the sixth switch tube module.

In some embodiments, the controlling unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on according to a current level of a first ac power input from an ac power supply, including: under the condition that the current of the first alternating current is smaller than a first set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on; wherein: the second switching tube module is controlled to be conducted, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit; controlling the second switch tube module to be disconnected, and controlling the first switch tube module, the third switch tube module to the sixth switch tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module to charge the bus capacitor unit through a body diode of a switch tube in the first switch tube module in the positive half cycle of the alternating current power supply; controlling the first switching tube module to be conducted, and controlling the second switching tube module to the sixth switching tube module to be disconnected, so that the first alternating current input by the input port of the alternating current power supply is charged to the first inductance module through the second direction module and supplies power to the bus capacitor unit in the negative half cycle of the alternating current power supply; and controlling the first switch tube module to be disconnected, and controlling the second switch tube module to the sixth switch tube module to be disconnected, so that the first alternating current input by the input port of the alternating current power supply is combined with the charging energy on the first inductance module to charge the bus capacitor unit through a body diode of a switch tube in the second switch tube module in the negative half cycle of the alternating current power supply.

In some embodiments, the controlling unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on according to a current level of a first ac power input from an ac power supply, including: when the current of the first alternating current is larger than a first set current threshold and smaller than a second set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on; wherein: the second switching tube module and the fourth switching tube module are controlled to be conducted, and the first switching tube module, the third switching tube module, the fifth switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input by an input port of the alternating current power supply is charged to the first inductance module and the second inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit; controlling the second switch tube module and the fourth switch tube module to be disconnected, and controlling the first switch tube module, the third switch tube module, the fifth switch tube module and the sixth switch tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module and the second inductance module in the positive half cycle of the alternating current power supply, and the first alternating current passes through a body diode of a switch tube in the first switch tube module and a body diode of a switch tube in the third switch tube module, passes through the first direction module, and then charges the bus capacitor unit; the first switching tube module and the third switching tube module are controlled to be conducted, and the second switching tube module, the fourth switching tube module, the fifth switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input by an input port of the alternating current power supply is charged to the first inductance module and the second inductance module through the second direction module in the negative half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit; control first switch tube module the third switch tube module switches on, and control the second switch tube module the fourth switch tube module the fifth switch tube module with the disconnection of sixth switch tube module, with alternating current power supply's negative half cycle makes alternating current power supply's input port input first alternating current, combine first inductance module with charging energy on the second inductance module, the process give behind the second direction module first inductance module with the second inductance module charges, the process body diode of switch tube in the second switch tube module and the body diode of switch tube in the fourth switch tube module, and the process behind the second direction module, to bus capacitor unit charges.

In some embodiments, the control unit further comprises: a switching module; the switching module includes: the first switching tube module and the second switching tube module; the first switching switch tube module is arranged on the output side of the second inductance module; the second switching switch tube module is arranged on the output side of the third inductance module; the control unit controls the charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be switched on according to the current magnitude of the first alternating current input from the alternating current power supply, and includes: when the current of the first alternating current is larger than a second set current threshold and smaller than a third set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on; wherein: the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be conducted, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module, the second inductance module and the third inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the bus capacitor unit is powered; the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be disconnected, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module, the second inductance module and the third inductance module in the positive half cycle of the alternating current power supply to charge the bus capacitor unit after passing through the first direction module; the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be conducted, and the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module, the second inductance module and the third inductance module after passing through the second direction module in the negative half cycle of the alternating current power supply, and the bus capacitor unit is powered; control first switch tube module third switch tube module with the disconnection of sixth switch tube module, and control second switch tube module fourth switch tube module with the disconnection of fifth switch tube module, with alternating current power supply's negative half cycle makes alternating current power supply's input port input first alternating current combines first inductance module second inductance module with the last charging energy of third inductance module, process behind the second direction module, give to bus capacitor unit charges.

In some embodiments, the bus capacitor unit includes: the first capacitor module, the second capacitor module and the third capacitor module; the first capacitor module, the second capacitor module and the third capacitor module are arranged in parallel.

With the above device phase-match, the utility model discloses another aspect provides a motor system, include: the driving device of the bridgeless PFC power supply is described above.

Therefore, the utility model discloses a scheme combines together through utilizing invalid PFC circuit and crisscross parallel technique, sets up the crisscross parallel drive circuit of three routes of no bridge PFC circuit, through the electric current size according to the alternating current power supply of input, controls the crisscross parallel drive circuit's of three routes break-make to, through setting up the crisscross parallel drive's of three routes no bridge PFC circuit, can reduce the on-state loss of PFC circuit.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a driving apparatus of a bridgeless PFC power supply according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment of a three-way interleaved parallel driving circuit of a bridgeless PFC circuit according to the present invention;

fig. 3 is a schematic flow chart illustrating a control method of the driving apparatus of the bridgeless PFC power supply according to an embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In consideration of the above, in the related art, the converter of the PFC circuit has the advantages of high reliability, low cost, simple structure and small common mode interference, but has the disadvantage of large on-state loss. The on-state loss is the loss when the IGBT turns on and off.

According to the utility model discloses an embodiment provides a drive arrangement of no bridge PFC power. Referring to fig. 1, a schematic structural diagram of an embodiment of the apparatus of the present invention is shown. The driving device of the bridgeless PFC power supply can comprise: the device comprises a charging unit, a control unit and a bus capacitor unit. The charging unit, the control unit and the bus capacitor unit are connected in sequence. The charging unit includes: the inductor comprises a first inductor module, a second inductor module and a third inductor module. Each of the first inductor module, the second inductor module, and the third inductor module may include only one inductor, for example, the first inductor module may include an inductor L1, the second inductor module may include an inductor L2, and the third inductor module may include an inductor L3. Each of the first inductor module, the second inductor module, and the third inductor module may also include an inductor group, such as an inductor group formed by connecting several inductors in series and parallel.

Any one of the first inductance module, the second inductance module and the third inductance module is configured to receive a first alternating current input from an alternating current power supply, and charge any one of the inductance modules by using the first alternating current input from the alternating current power supply when a charging loop of the inductance module is switched on.

The control unit is configured to control the charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be switched on according to the current magnitude of the first alternating current input from the alternating current power supply, so that the charging loop of at least one of the first inductor module, the second inductor module and the third inductor module is switched on, the first alternating current input from the alternating current power supply can be received, and the first alternating current input from the alternating current power supply is utilized to charge the self.

The bus capacitor unit is configured to store electric energy obtained by charging at least one of the first inductor module, the second inductor module and the third inductor module when a charging loop of at least one of the first inductor module, the second inductor module and the third inductor module is connected and charged, so as to obtain direct current.

Therefore, the utility model discloses a scheme provides a drive arrangement of no bridge PFC power, specifically is the crisscross parallel drive circuit of three routes of no bridge PFC circuit for voltage and electric current same phase are unanimous, can improve the power factor of PFC circuit, thereby can improve the efficiency of PFC circuit, have reduced current harmonic distortion. Specifically, through the first inductance module, the second inductance module and the third inductance module, an alternating current power supply can be divided into 3 sections, each section is 120 degrees, the current equalizing effect is better, and the electric energy conversion efficiency is higher.

In some embodiments, further comprising: and an inversion unit. The inversion unit, such as an inverter, is arranged at the output side of the bus capacitor unit and is used for supplying power to equipment to be supplied, such as a motor.

The inversion unit is configured to invert the direct current stored in the bus capacitor unit to obtain a second alternating current required by the operation of the equipment to be powered.

In order to improve the efficiency of the driver (i.e. PFC circuit) of the bridgeless PFC power supply, many driver topologies of the bridgeless PFC power supply are proposed. Compared with the driver of the bridgeless PFC power supply in the related scheme, the driver of the bridgeless PFC power supply has the advantages that one diode is omitted in a power loop, and therefore the efficiency of the driver of the bridgeless PFC power supply is improved. The utility model discloses a crisscross parallel drive circuit of three routes of no bridge PFC circuit that the scheme provided, the crisscross PFC circuit of three routes relatively has used four diodes less, and the cost reduces relatively, has saved the device cost, has also reduced the volume of device.

In some embodiments, the control unit comprises: and a control module. The control module includes: the device comprises a first switching tube module, a second switching tube module, a third switching tube module, a fourth switching tube module, a fifth switching tube module, a sixth switching tube module, a first direction module and a second direction module. The power MOS transistor module comprises a first switch transistor module such as a power MOS transistor module UND1, a second switch transistor module such as a power MOS transistor module UND2, a third switch transistor module such as a power MOS transistor module UND3, a fourth switch transistor module such as a power MOS transistor module UND4, a fifth switch transistor module such as a power MOS transistor module UND5 and a sixth switch transistor module such as a power MOS transistor module UND 6. A first direction module such as diode D1 and a second direction module such as diode D2.

Fig. 2 is a schematic structural diagram of an embodiment of the three-way interleaved parallel driving circuit of the bridgeless PFC circuit according to the present invention. As shown in fig. 2, the three-way interleaved parallel driving circuit of the bridgeless PFC circuit includes: an input port J3 of an input power supply, input inductances of an alternating current power supply such as an inductance L1, an inductance L2, an inductance L3, control modules such as power MOS transistor modules UND1 to UND6, low-speed diodes such as a diode D1, a diode D2, an inverter such as an inverter constituted by power MOS transistor modules UND7 to UND12, and three-phase output terminals of the inverter such as a terminal X1, a terminal X2, and a terminal X3. From the input port J3 to which the power supply is input, a voltage of 220V can be input. In the power MOS transistor module, a power MOS transistor (metal-oxide semiconductor field effect transistor, MOSFET) and a body diode of the power MOS transistor are provided.

Each switch tube module can form a charging loop with one inductance module and the positive half cycle or the negative half cycle of the alternating current power supply.

The first direction module is arranged between the input port of the alternating current power supply and the second switch tube module, the fourth switch tube module and the fifth switch tube module, and can be conducted to the input port of the alternating current power supply through any switch module in the second switch tube module, the fourth switch tube module and the fifth switch tube module.

The second direction module is arranged at the input port of the alternating current power supply, the first switch tube module, the third switch tube module and the sixth switch tube module are arranged between the first switch tube module and the sixth switch tube module, and the input port of the alternating current power supply can be communicated with any switch tube module in the first switch tube module, the third switch tube module and the sixth switch tube module.

For example: the first switch tube module can form a charging loop with the first inductance module and the positive half cycle of the alternating current power supply. The second switch tube module can form a charging loop with the first inductance module and the negative half cycle of the alternating current power supply. And the third switching tube module can form a charging loop with the second inductance module and the positive half cycle of the alternating current power supply. And the fourth switch tube module can form a charging loop with the second inductance module and the negative half cycle of the alternating current power supply. And the sixth switching tube module can form a charging loop with the third inductance module and the positive half cycle of the alternating current power supply. And the fifth switching tube module can form a charging loop with the third inductance module and the negative half cycle of the alternating current power supply.

In some embodiments, the controlling unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on according to a current level of a first ac power input from an ac power supply, including: and under the condition that the current of the first alternating current is smaller than a first set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on.

Wherein the control unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on when the current of the first alternating current is smaller than a first set current threshold, and includes:

the control unit is specifically configured to control the second switching tube module to be turned on, and control the first switching tube module, the third switching tube module to the sixth switching tube module to be turned off, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module through the first direction module, and the bus capacitor unit is powered.

The control unit is specifically configured to control the second switching tube module to be turned off, and control the first switching tube module, the third switching tube module to the sixth switching tube module to be also turned off, so that the first alternating current input from the input port of the alternating current power supply is charged to the bus capacitor unit through a body diode of a switching tube in the first switching tube module in combination with charging energy on the first inductance module in a positive half cycle of the alternating current power supply.

The control unit is specifically configured to control the first switching tube module to be turned on, and control the second switching tube module to the sixth switching tube module to be turned off, so that in a negative half cycle of the ac power supply, the first ac power input from the input port of the ac power supply is charged to the first inductance module through the second direction module, and the bus capacitor unit is powered.

The control unit is specifically configured to control the first switching tube module to be turned off, and control the second to sixth switching tube modules to be turned off, so that the first alternating current input from the input port of the alternating current power supply is charged to the bus capacitor unit through a body diode of a switching tube in the second switching tube module in combination with charging energy on the first inductance module in a negative half cycle of the alternating current power supply.

For example: in the example shown in fig. 2, the operation of the three-way interleaved parallel driving circuit of the bridgeless PFC circuit includes: the first operating condition is: when an input current corresponding to an input alternating voltage of 220V is less than 10A and the input alternating voltage is input from an input port J3 of the input power supply, the system works in a critical state, and the control condition of the control module is as follows:

step 11, the power MOS transistor module UND2 is closed, the other power MOS transistor modules UNDX x are disconnected, in the positive half cycle of the 220V voltage input from the input port J3 of the input power supply, the 3 pin of the input port J3 is positive, the 1 pin of the input port J3 is negative, and the inductor L1 is charged through the diode D1. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work. Here, the other power MOS transistor module UNDX is a power MOS transistor module other than the power MOS transistor module UND2 participating in the control, for example, other power MOS transistor modules other than the power MOS transistor module UND2 in the power MOS transistor modules UND1 to UND6, and the following points are similar to the above.

And step 12, disconnecting the power MOS transistor module UND2, disconnecting the other power MOS transistor modules UNDX, adding charging energy of an inductor L1 in the positive half cycle of the 220V voltage input from the input port J3 of the input power supply, and charging the electrolytic capacitor through the capacitor C1, the capacitor C2 and the capacitor C3 through the body diode of the power MOS transistor module UND 1. The capacitor C1, the capacitor C2, and the capacitor C3 may be electrolytic capacitors.

Step 13, the power MOS transistor module UND1 is closed, the other power MOS transistor modules UNDX are disconnected, in the negative half cycle of 220V voltage input from the input port J3 of the input power supply, the 3 pin of the input port J3 is negative, the 1 pin of the input port J3 is positive, and the inductor L1 is charged through the diode D2. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work.

And 14, disconnecting the power MOS transistor module UND1, disconnecting the other power MOS transistor modules UNDX, adding the energy charged by the inductor L1 in the negative half cycle of the 220V voltage input by the input port J3 of the input power supply, and charging the energy through the body diode of the power MOS transistor module UND2, the capacitor C1, the capacitor C2 and the capacitor C3.

In some embodiments, the controlling unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on according to a current level of a first ac power input from an ac power supply, including: and under the condition that the current of the first alternating current is greater than a first set current threshold and less than a second set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on.

Wherein the control unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on when the current of the first alternating current is greater than a first set current threshold and smaller than a second set current threshold, and includes:

the control unit is specifically configured to control the second switching tube module and the fourth switching tube module to be switched on and control the first switching tube module, the third switching tube module, the fifth switching tube module and the sixth switching tube module to be switched off, so that the first alternating current input by the input port of the alternating current power supply is enabled to be charged to the first inductance module and the second inductance module after passing through the first direction module, and the bus capacitor unit is powered.

The control unit is specifically further configured to control the second switching tube module and the fourth switching tube module to be disconnected, and control the first switching tube module, the third switching tube module, the fifth switching tube module and the sixth switching tube module to be disconnected, so that in the positive half cycle of the ac power supply, the first ac power input from the input port of the ac power supply is charged to the bus capacitor unit through the body diode of the switching tube in the first switching tube module and the body diode of the switching tube in the third switching tube module and through the first direction module in combination with the charging energy on the first inductance module and the second inductance module.

The control unit is specifically configured to control the first switching tube module, the third switching tube module to be turned on, and control the second switching tube module, the fourth switching tube module, the fifth switching tube module and the sixth switching tube module to be turned off, so that the first alternating current input by the input port of the alternating current power supply is charged to the bus capacitor unit after passing through the second direction module in the negative half cycle of the alternating current power supply.

The control unit is specifically further configured to control the first switching tube module and the third switching tube module to be turned on, and control the second switching tube module, the fourth switching tube module, the fifth switching tube module and the sixth switching tube module to be turned off, so that the first alternating current input from the input port of the alternating current power supply is charged by combining with the charging energy on the first inductance module and the second inductance module through the second direction module, and then the first inductance module and the second inductance module are charged through the body diode of the switching tube in the second switching tube module and the body diode of the switching tube in the fourth switching tube module, and then the bus capacitance unit is charged through the second direction module.

For example: in the example shown in fig. 2, the operation of the three-way interleaved parallel driving circuit of the bridgeless PFC circuit includes: the second operating condition is as follows: when the input current corresponding to the input alternating voltage is larger than 10A and the input current corresponding to the input alternating voltage is smaller than 20A, the system works in a critical state, the power MOS tube module UND13 is closed, and the control condition of the control module is as follows:

step 21, UND2, UND4 power MOS tube module is closed, other UNDX power MOS tube modules are disconnected, in the positive half cycle of 220V voltage input from the input port J3 of the input power supply, 3 pins of the input port J3 are positive, 1 pin of the input port J3 is negative, and the inductor L1 and the inductor L2 are charged through the diode D1. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work.

Step 22, the power MOS transistor module UND2 and the power MOS transistor module UND4 are disconnected, the other power MOS transistor modules UNDX x are disconnected, charging energy of the inductor L1 and the inductor L2 is added in the positive half cycle of the 220V voltage input from the input port J3 of the input power supply, the charging energy passes through the power MOS transistor module UND1 and the body diode of the power MOS transistor module UND3, the charging energy passes through the diode D1, the capacitor C1, the capacitor C2 and the capacitor C3, and the driving motor (such as a motor in a compressor) works.

Step 23, the power MOS transistor module UND1 and the power MOS transistor module UND3 are closed, the other power MOS transistor modules UNDX are disconnected, in the negative half cycle of 220V voltage input by the input port J3 of the input power supply, the 3 pin of the input port J3 is negative, the 1 pin of the input port J3 is positive, and the inductor L1 and the inductor L2 are charged through the diode D2. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work.

And 24, disconnecting the power MOS transistor module UND1 and the power MOS transistor module UND3, disconnecting the other power MOS transistor modules UNDX, adding charging energy of an inductor L1 and an inductor L2 in the negative half cycle of 220V voltage input by an input port J3 of an input power supply, charging through a capacitor C1, a capacitor C2 and a capacitor C3 through a body diode of the power MOS transistor module UND2 and a body diode of the power MOS transistor module UND4, and driving a motor (such as a motor in a compressor) to work.

Thus, the utility model discloses a crisscross parallel drive circuit of three routes of no bridge PFC circuit that the scheme provided can realize that power MOSFET's valley bottom switches on (VS) or zero voltage opens (ZVS) to and the zero current of diode is turn-off, thereby reduce power MOSFET's switching loss and the reverse recovery loss of diode. Therefore, zero voltage switching-on (ZVS) and zero current switching-off of the diode are realized on the control strategy of the three-way interleaved parallel driving circuit of the bridgeless PFC circuit, so that the switching loss of the power MOSFET and the reverse recovery loss of the diode are reduced, the self-loss of circuit switching is reduced, and the on-state loss of the PFC circuit is reduced. The on-state loss is the product of the forward voltage drop across the diode and the forward current when the diode is in forward conduction.

In some embodiments, the control unit further comprises: and a switching module. The switching module includes: the first switch tube module and the second switch tube module. The first switching switch tube module is arranged on the output side of the second inductance module. And the second switching switch tube module is arranged on the output side of the third inductance module. For example: a first switching tube module, such as power switching tube module UND13, and a second switching tube module, such as power switching tube module UND 14. As shown in fig. 2, the three-way interleaved parallel driving circuit of the bridgeless PFC circuit further includes: and the commutation modules are power MOS tube modules UND 13-UND 14.

The control unit controls the charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be switched on according to the current magnitude of the first alternating current input from the alternating current power supply, and includes: and under the condition that the current of the first alternating current is greater than a second set current threshold and smaller than a third set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on.

Wherein the control unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be turned on when the current of the first alternating current is greater than a second set current threshold and smaller than a third set current threshold, and includes:

the control unit is specifically configured to control the second switching tube module, the fourth switching tube module and the fifth switching tube module to be switched on and control the first switching tube module, the third switching tube module and the sixth switching tube module to be switched off, so that the first alternating current input by the input port of the alternating current power supply is enabled to be charged to the bus capacitor unit through the first direction module and then to be supplied to the first inductance module, the second inductance module and the third inductance module.

The control unit is specifically configured to control the second switching tube module, the fourth switching tube module and the fifth switching tube module to be disconnected, and control the first switching tube module, the third switching tube module and the sixth switching tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module, the second inductance module and the third inductance module to charge the bus capacitor unit after passing through the first direction module in the positive half cycle of the alternating current power supply.

The control unit is specifically configured to control the first switching tube module, the third switching tube module and the sixth switching tube module to be switched on and control the second switching tube module, the fourth switching tube module and the fifth switching tube module to be switched off, so that the first alternating current input by the input port of the alternating current power supply is enabled in the negative half cycle of the alternating current power supply, and the first alternating current, the second inductive module and the third inductive module are charged after the second direction module to supply power to the bus capacitor unit.

The control unit is specifically further configured to control the first switching tube module, the third switching tube module and the sixth switching tube module to be disconnected, and control the second switching tube module, the fourth switching tube module and the fifth switching tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the bus capacitor unit after passing through the second direction module in combination with the charging energy on the first inductance module, the second inductance module and the third inductance module in the negative half cycle of the alternating current power supply.

For example: in the example shown in fig. 2, the operation of the three-way interleaved parallel driving circuit of the bridgeless PFC circuit includes: the third operating condition: when the input current corresponding to the input alternating voltage is greater than 20A and the input current corresponding to the input alternating voltage is less than 30A, the system works in a critical state, the switching tubes of the power MOS tube module UND13 and the power MOS tube module UND14 are closed, and the control condition of the control module is as follows:

step 31, the power MOS transistor module UND2, the power MOS transistor module UND4, the power MOS transistor module UND5 are closed, other power MOS transistor modules UNDX are disconnected, in the positive half cycle of 220V voltage input by the input port J3 of the input power supply, the 3 pin of the input port J3 is positive, the 1 pin of the input port J3 is negative, and the inductor L1, the inductor L2 and the inductor L3 are charged through the diode D1. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work.

Step 32, the power MOS module UND2, the power MOS module UND4, the power MOS module UND5 are disconnected, the other power MOS modules UNDX x are disconnected, charging energy of an inductor L1, an inductor L2 and an inductor L3 is added to the positive half cycle of the 220V voltage input from the input port J3 of the input power supply, the charging energy is charged through a capacitor C1, a capacitor C2 and a capacitor C3 through body diodes of the power MOS modules UND1, UND3 and UND6, and a driving motor (such as a motor in a compressor) works through a diode D1. The capacitor C1, the capacitor C2 and the capacitor C3 are arranged, so that current sharing can be realized, and cost is considered.

Step 33, closing the power MOS transistor module UND1, the power MOS transistor module UND3 and the power MOS transistor module UND6, disconnecting the other power MOS transistor modules UNDX, charging the inductor L1, the inductor L2 and the inductor L3 through the diode D2, wherein the 3 pin of the input port J3 is negative and the 1 pin of the input port J3 is positive in the negative half cycle of 220V voltage input by the input port J3 of the input power supply. The capacitor C1, the capacitor C2 and the capacitor C3 provide direct current of positive and negative top and bottom for the inverter to drive a motor (such as a motor in a compressor) to work.

Step 34, the power MOS transistor module UND1, the power MOS transistor module UND3, the power MOS transistor module UND6 are disconnected, the other power MOS transistor modules UNDX x are disconnected, energy charged by the inductor L1, the inductor L2 and the inductor L3 is added to the negative half cycle of the 220V voltage input from the input port J3 of the input power supply, and the energy is charged by the body diodes of the power MOS transistor module UND2, the power MOS transistor module UND4 and the power MOS transistor module UND5 through the capacitor C1, the capacitor C2 and the capacitor C3, so that a driving motor (such as a motor in a compressor) works.

The power MOS transistor in the power MOS transistor module may also be replaced by other switching devices such as an IGBT (insulated gate bipolar transistor) and a bridgeless PFC module.

The utility model discloses a scheme adopts three input inductance if inductance L1, inductance L2, inductance L3, compares with adopting an input inductance in the relevant scheme, and power density ratio improves to some extent. And the bridgeless PFC circuit is matched with three paths of parallel interleaving control, so that the current shared by the three inductors is a little smaller, and the service life of the whole driving scheme is relatively longer. In addition, the control logic of the system input current is judged, and the circuit is reasonably switched according to the current grade of the system, so that the control of the system is more balanced.

In some embodiments, the bus capacitor unit includes: the first capacitor module, the second capacitor module and the third capacitor module. The first capacitor module, the second capacitor module and the third capacitor module are arranged in parallel.

For example: a first capacitive module such as capacitor C1, a second capacitive module such as capacitor C1, and a third capacitive module such as capacitor C3. As shown in fig. 2, in the three-way interleaved parallel driving circuit of the bridgeless PFC circuit, the dc bus capacitors include a capacitor C1, a capacitor C2, and a capacitor C3.

The utility model discloses a crisscross parallel drive circuit of three routes of no bridge PFC circuit that the scheme provided utilizes the combination of no bridge and crisscross parallel technique, has improved the efficiency and the power density of the driver of no bridge PFC power, compares in the scheme of being correlated with crisscross parallelly connected Boost type PFC circuit (Boost type PFC circuit promptly), and the performance and the conversion efficiency of flow equalizing obtain obviously promoting.

Through a large amount of experimental verifications, adopt the technical scheme of the utility model, combine together through utilizing invalid PFC circuit and crisscross parallel technique, set up the crisscross parallel drive circuit of three routes of no bridge PFC circuit, through the electric current size according to the alternating current power supply of input, the break-make of the crisscross parallel drive circuit of control three routes to, through the no bridge PFC circuit that sets up the crisscross parallel drive of three routes, can reduce the on-state loss of PFC circuit.

According to the utility model discloses an embodiment still provides a motor system corresponding to the drive arrangement of no bridge PFC power. The motor system may include: the driving device of the bridgeless PFC power supply is described above.

Since the processing and functions implemented by the motor system of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

Through a large amount of experimental verifications, adopt the technical scheme of the utility model, combine together through utilizing invalid PFC circuit and crisscross parallel technology, set up the crisscross parallel drive circuit of three routes of no bridge PFC circuit, through the electric current size according to the alternating current power supply of input, the break-make of the crisscross parallel drive circuit of control three routes has realized that zero-voltage opens (ZVS) and the zero current of diode is turn-offed to reduce power MOSFET's switching loss and the reverse recovery loss of diode, reduced the self-loss that the circuit switched.

According to the embodiment of the present invention, there is also provided a control method of the driving apparatus corresponding to the bridge-less PFC power supply of the motor system, as shown in fig. 3, the present invention provides a schematic flow chart of an embodiment of the method. The control method of the driving device of the bridgeless PFC power supply can comprise the following steps: step S110 and step S120.

At step S110, the control unit controls a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module to be connected according to a current magnitude of the first ac power input from the ac power source, so that the at least one charging module connected to the charging loop of the first inductor module, the second inductor module, and the third inductor module can receive the first ac power input from the ac power source and charge itself with the first ac power input from the ac power source. The first inductance module, the second inductance module and any inductance module in the third inductance module receive the first alternating current input from the alternating current power supply, and under the condition that the charging loop of the first inductance module is switched on, the first alternating current input from the alternating current power supply is utilized to charge any inductance module.

At step S120, by using a bus capacitor unit, under the condition that a charging loop of at least one of the first inductor module, the second inductor module, and the third inductor module is connected and charged, storing electric energy obtained by charging at least one of the first inductor module, the second inductor module, and the third inductor module, so as to obtain direct current.

Therefore, the utility model discloses a scheme provides a drive arrangement of no bridge PFC power, specifically is the crisscross parallel drive circuit of three routes of no bridge PFC circuit for voltage and electric current same phase are unanimous, can improve the power factor of PFC circuit, thereby can improve the efficiency of PFC circuit, have reduced current harmonic distortion. Specifically, through the first inductance module, the second inductance module and the third inductance module, an alternating current power supply can be divided into 3 sections, each section is 120 degrees, the current equalizing effect is better, and the electric energy conversion efficiency is higher.

In some embodiments, further comprising: and inverting the direct current stored in the bus capacitor unit through an inversion unit to obtain a second alternating current required by the work of the equipment to be powered. The inversion unit, such as an inverter, is arranged at the output side of the bus capacitor unit and is used for supplying power to equipment to be supplied, such as a motor.

In order to improve the efficiency of the driver (i.e. PFC circuit) of the bridgeless PFC power supply, many driver topologies of the bridgeless PFC power supply are proposed. Compared with the driver of the bridgeless PFC power supply in the related scheme, the driver of the bridgeless PFC power supply has the advantages that one diode is omitted in a power loop, and therefore the efficiency of the driver of the bridgeless PFC power supply is improved. The utility model discloses a crisscross parallel drive circuit of three routes of no bridge PFC circuit that the scheme provided, the crisscross PFC circuit of three routes relatively has used four diodes less, and the cost reduces relatively, has saved the device cost, has also reduced the volume of device.

Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles, and examples of the driving apparatus for bridgeless PFC power supply, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment, and further description is not repeated here.

Through a large number of tests, the technical scheme of the embodiment is adopted, the invalid PFC circuit and the interleaving parallel technology are combined, the three-path interleaving parallel driving circuit of the bridgeless PFC circuit is arranged, the on-off of the three-path interleaving parallel driving circuit is controlled according to the current of the input alternating current power supply, and the on-state loss is small; in addition, compared with a three-way staggered PFC circuit, four diodes are omitted, the cost is relatively reduced, the device cost is saved, and the size of the device is also reduced.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (8)

1. A driving apparatus of a bridgeless PFC power supply, comprising: the charging unit, the control unit and the bus capacitor unit; the charging unit includes: the inductor comprises a first inductor module, a second inductor module and a third inductor module; wherein the content of the first and second substances,

any one of the first inductance module, the second inductance module and the third inductance module is configured to receive a first alternating current input from an alternating current power supply, and charge the inductance module by using the first alternating current input from the alternating current power supply when a charging loop of the inductance module is switched on;

the control unit is configured to control a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on according to the current magnitude of a first alternating current input from an alternating current power supply;

the bus capacitor unit is configured to store electric energy obtained by charging at least one of the first inductor module, the second inductor module and the third inductor module when a charging loop of at least one of the first inductor module, the second inductor module and the third inductor module is connected and charged, so as to obtain direct current.

2. The driving apparatus of the bridgeless PFC power supply according to claim 1, further comprising: an inversion unit;

the inversion unit is configured to invert the direct current stored in the bus capacitor unit to obtain a second alternating current required by the operation of the equipment to be powered.

3. The driving apparatus of a bridgeless PFC power supply according to claim 1 or 2, wherein the control unit comprises: a control module; the control module includes: the first switch tube module, the second switch tube module, the third switch tube module, the fourth switch tube module, the fifth switch tube module and the sixth switch tube module, and the first direction module and the second direction module;

each switching tube module can form a charging loop with one inductance module and the positive half cycle or the negative half cycle of the alternating current power supply;

the first direction module is arranged between an input port of the alternating current power supply and the second switching tube module, the fourth switching tube module and the fifth switching tube module, and can be conducted to the input port of the alternating current power supply by any one of the second switching tube module, the fourth switching tube module and the fifth switching tube module;

the second direction module is arranged at the input port of the alternating current power supply, the first switch tube module, the third switch tube module and the sixth switch tube module are arranged between the first switch tube module and the sixth switch tube module, and the input port of the alternating current power supply can be communicated with any switch tube module in the first switch tube module, the third switch tube module and the sixth switch tube module.

4. The driving apparatus of a bridgeless PFC power supply according to claim 3, wherein the control unit controls a charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be turned on according to a current magnitude of a first ac power input from an ac power supply, and comprises: under the condition that the current of the first alternating current is smaller than a first set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on;

wherein:

the second switching tube module is controlled to be conducted, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit;

controlling the second switch tube module to be disconnected, and controlling the first switch tube module, the third switch tube module to the sixth switch tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module to charge the bus capacitor unit through a body diode of a switch tube in the first switch tube module in the positive half cycle of the alternating current power supply;

controlling the first switching tube module to be conducted, and controlling the second switching tube module to the sixth switching tube module to be disconnected, so that the first alternating current input by the input port of the alternating current power supply is charged to the first inductance module through the second direction module and supplies power to the bus capacitor unit in the negative half cycle of the alternating current power supply;

and controlling the first switch tube module to be disconnected, and controlling the second switch tube module to the sixth switch tube module to be disconnected, so that the first alternating current input by the input port of the alternating current power supply is combined with the charging energy on the first inductance module to charge the bus capacitor unit through a body diode of a switch tube in the second switch tube module in the negative half cycle of the alternating current power supply.

5. The driving apparatus of a bridgeless PFC power supply according to claim 3, wherein the control unit controls a charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be turned on according to a current magnitude of a first ac power input from an ac power supply, and comprises: when the current of the first alternating current is larger than a first set current threshold and smaller than a second set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on;

wherein:

the second switching tube module and the fourth switching tube module are controlled to be conducted, and the first switching tube module, the third switching tube module, the fifth switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input by an input port of the alternating current power supply is charged to the first inductance module and the second inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit;

controlling the second switch tube module and the fourth switch tube module to be disconnected, and controlling the first switch tube module, the third switch tube module, the fifth switch tube module and the sixth switch tube module to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module and the second inductance module in the positive half cycle of the alternating current power supply, and the first alternating current passes through a body diode of a switch tube in the first switch tube module and a body diode of a switch tube in the third switch tube module, passes through the first direction module, and then charges the bus capacitor unit;

the first switching tube module and the third switching tube module are controlled to be conducted, and the second switching tube module, the fourth switching tube module, the fifth switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input by an input port of the alternating current power supply is charged to the first inductance module and the second inductance module through the second direction module in the negative half cycle of the alternating current power supply, and the power is supplied to the bus capacitor unit;

control first switch tube module the third switch tube module switches on, and control the second switch tube module the fourth switch tube module the fifth switch tube module with the disconnection of sixth switch tube module, with alternating current power supply's negative half cycle makes alternating current power supply's input port input first alternating current, combine first inductance module with charging energy on the second inductance module, the process give behind the second direction module first inductance module with the second inductance module charges, the process body diode of switch tube in the second switch tube module and the body diode of switch tube in the fourth switch tube module, and the process behind the second direction module, to bus capacitor unit charges.

6. The driving apparatus of the bridgeless PFC power supply according to claim 3, wherein the control unit further comprises: a switching module; the switching module includes: the first switching tube module and the second switching tube module; the first switching switch tube module is arranged on the output side of the second inductance module; the second switching switch tube module is arranged on the output side of the third inductance module;

the control unit controls the charging loop of at least one of the first inductor module, the second inductor module and the third inductor module to be switched on according to the current magnitude of the first alternating current input from the alternating current power supply, and includes: when the current of the first alternating current is larger than a second set current threshold and smaller than a third set current threshold, controlling a charging loop of at least one of the first inductance module, the second inductance module and the third inductance module to be switched on;

wherein:

the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be conducted, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module, the second inductance module and the third inductance module through the first direction module in the positive half cycle of the alternating current power supply, and the bus capacitor unit is powered;

the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be disconnected, and the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is combined with the charging energy on the first inductance module, the second inductance module and the third inductance module in the positive half cycle of the alternating current power supply to charge the bus capacitor unit after passing through the first direction module;

the first switching tube module, the third switching tube module and the sixth switching tube module are controlled to be conducted, and the second switching tube module, the fourth switching tube module and the fifth switching tube module are controlled to be disconnected, so that the first alternating current input from the input port of the alternating current power supply is charged to the first inductance module, the second inductance module and the third inductance module after passing through the second direction module in the negative half cycle of the alternating current power supply, and the bus capacitor unit is powered;

control first switch tube module third switch tube module with the disconnection of sixth switch tube module, and control second switch tube module fourth switch tube module with the disconnection of fifth switch tube module, with alternating current power supply's negative half cycle makes alternating current power supply's input port input first alternating current combines first inductance module second inductance module with the last charging energy of third inductance module, process behind the second direction module, give to bus capacitor unit charges.

7. The driving apparatus of a bridgeless PFC power supply according to claim 1 or 2, wherein the bus capacitor unit comprises: the first capacitor module, the second capacitor module and the third capacitor module; the first capacitor module, the second capacitor module and the third capacitor module are arranged in parallel.

8. An electric machine system, comprising: the driving apparatus of the bridgeless PFC power supply according to any one of claims 1 to 7.

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