CN216216512U - Multi-path interleaved PFC circuit, power factor correction device and electric appliance - Google Patents
Multi-path interleaved PFC circuit, power factor correction device and electric appliance Download PDFInfo
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- CN216216512U CN216216512U CN202122858649.5U CN202122858649U CN216216512U CN 216216512 U CN216216512 U CN 216216512U CN 202122858649 U CN202122858649 U CN 202122858649U CN 216216512 U CN216216512 U CN 216216512U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a multi-path interleaved PFC circuit, a power factor correction device and an electric appliance, wherein the multi-path interleaved PFC circuit comprises a plurality of paths of PFCs connected in parallel, each PFC comprises an IGBT, the gate pole of at least one path of the IGBT of each PFC is connected with a low-current cut-off control module, the low-current cut-off control module is connected with a control chip, the control chip is connected with a current sampling circuit, and the control chip controls the low-current cut-off control module to connect or disconnect the IGBT into a circuit according to current data collected by the current sampling circuit so as to control the number of paths of the PFCs working at the same time. According to the utility model, through the arrangement of the low-current cut-off control module, the circuit can select the number of the PFC circuits to be switched on or switched off according to the current condition, so that the number of the PFC circuits to be switched on is adjusted according to the requirement, and the power consumption of the electric appliance in the low-current operation state is reduced.
Description
Technical Field
The utility model relates to the technical field of circuit protection, in particular to a multi-path interleaved PFC circuit, a power factor correction device and an electric appliance.
Background
A PFC (power factor Correction) circuit is generally introduced into an existing electronic power device, so that on one hand, the utilization rate of a power supply to mains supply can be improved when alternating current is converted into direct current through the PFC circuit, and the electric energy loss in the conversion process is reduced, thereby saving energy; on the other hand, harmonic pollution in the power grid can be reduced through the PFC circuit.
At present, a controller of a commercial high-power variable-frequency air conditioner adopts a multi-path staggered PFC design in combination with the consideration of the factors in the aspects of reliability, cost and the like, but the design causes the number of PFC power devices to be doubled, so that the power consumption of the controller is higher under the low-current operation condition of the air conditioner, such as the condition of driving and heating a compressor, the national low-power consumption requirement is difficult to meet, and the PFC cannot be completely closed under the low-current operation condition, so that the power factor is low, and the energy consumption loss is large.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that in the prior art, under the condition of low-current operation, a multi-path staggered PFC power device cannot completely turn off the PFC, so that the power factor is low and the energy consumption is high.
In order to solve the above problems, the present invention provides a multi-path interleaved PFC circuit, which includes a plurality of parallel PFCs, where each PFC includes an IGBT, where a gate of at least one of the PFCs is connected to a low-current cut-off control module, the low-current cut-off control module is connected to a control chip, the control chip is connected to a current sampling circuit, and the control chip controls the low-current cut-off control module to switch the IGBT into or out of the circuit according to current data collected by the current sampling circuit, so as to control the number of PFCs that operate simultaneously.
This setting can be based on the electric current data control low current that current sampling circuit gathered and cut off control module, with IGBT access PFC circuit or disconnection, according to actual demand control electrical apparatus's operation consumption, avoids appearing the extravagant condition of energy.
Furthermore, the low current cut-off control module comprises a triode, a gate electrode of the triode is connected with the control chip, a collector electrode of the triode is respectively connected with a gate electrode of the IGBT and an IGBT driving information signal input end, and an emitting electrode of the triode is grounded.
The multi-path PFC circuit can easily complete the switching-in and switching-off work of multiple paths of PFCs only through the arrangement of the triode, so that the number of PFC circuits participating in operation can be adjusted according to actual requirements in the operation process of the equipment, redundant PFCs are timely switched off when the equipment operates at low current, and the power consumption of the equipment can be greatly reduced under the condition of ensuring the normal operation of the equipment.
Furthermore, a first resistor is arranged between the IGBT driving information signal input end and the IGBT gate pole and between the IGBT driving information signal input end and the triode collector, and the first resistor is a current limiting resistor and used for preventing the triode from being damaged due to overlarge current.
The arrangement can protect the triode from being damaged by overlarge current, and the use safety of the low-current cut-off control module is improved.
Furthermore, a second resistor is arranged between the control chip and the gate electrode of the triode, and the second resistor is a current-limiting resistor and used for preventing the triode from being damaged due to overlarge current.
The arrangement can protect the triode from being damaged by overlarge current, and the use safety of the low-current cut-off control module is improved.
Furthermore, a third grounded resistor is arranged between the gate pole of the triode and the control chip, and the third grounded resistor is a pull-down resistor and used for preventing misoperation of the triode under the interference of electromagnetic noise.
According to the arrangement, when no high level is input, the gate pole of the triode is always in a low level state, the condition that the triode is in misoperation due to possible high level interference is prevented, the control safety and accuracy of the triode are greatly improved, and the normal stable operation of equipment is ensured.
Further, each parallel PFC also comprises an inductor and a diode, wherein the collector of the IGBT is respectively connected with the inductor and the diode, and the emitter of the IGBT is grounded.
The inductor stores energy when the IGBT is conducted, when the IGBT is cut off, induction voltage is generated on the inductor, the capacitor is charged by the stored energy when the IGBT is conducted through the diode, and the current on the inductor cannot change suddenly and also has a limiting effect on the surge current of the capacitor, so that the capacitor is effectively protected, and the diode is used for boosting voltage so that the capacitor can output high-voltage direct current.
Further, in the IGBT connected to the low-current cutoff control module, an emitter of the IGBT is grounded through the second sampling resistor.
In the use process of the IGBT, a corresponding overcurrent protection circuit is required to be arranged to prevent the damage of the IGBT caused by the overlarge current, and the second sampling resistor is used for providing corresponding current data for the overcurrent protection circuit to cooperate with the overcurrent protection circuit to protect the IGBT from being damaged by the overlarge current, so that the working safety of the IGBT is ensured.
Furthermore, the current sampling circuit comprises a first sampling resistor, and the first sampling resistor is connected with the PFC bus and used for sampling current data of the PFC bus.
The number of the PFC circuits can be increased or decreased according to the current data acquired by the first sampling resistor, so that the PFC circuits can be switched on or switched off according to actual requirements, the condition that all the PFC circuits participate in operation under the low-current operation condition is effectively avoided, and the energy consumption under the low-current condition is greatly reduced.
The utility model also discloses a power factor correction device which comprises the multi-path interleaved PFC circuit.
The advantages of the electrical appliance and the multi-path interleaved PFC circuit are the same as those of the prior art, and are not described herein again.
The utility model also discloses an electric appliance, which comprises the multi-path interleaved PFC circuit.
The advantages of the electrical appliance and the multi-path interleaved PFC circuit are the same as those of the prior art, and are not described herein again.
Compared with the prior art, the multi-path interleaved PFC circuit and the electric appliance have the following advantages: the circuit can select the number of the PFC circuits to be switched on or switched off according to the current condition through the arrangement of the low-current cut-off control module, so that the number of the PFC circuits to be switched on is adjusted according to the requirement, the power consumption of an electric appliance in the low-current operation is reduced, meanwhile, the triode is prevented from being damaged by overlarge current through the arrangement of the current-limiting resistor, the operation safety of the low-current cut-off control module is ensured, and the misoperation of the triode under the condition of electromagnetic interference is avoided through the arrangement of the pull-down resistor, so that the operation accuracy of the low-current cut-off control module is improved.
Drawings
Fig. 1 is a schematic structural diagram of a multi-channel interleaved PFC circuit according to an embodiment of the present invention.
Description of reference numerals:
1-a first IGBT; 2-a first inductor; 3-a first diode; 4-an electrolytic capacitor; 5-a second IGBT; 6-a second inductor; 7-a second diode; 8-a first sampling resistor; 9-a first resistance; 10-a second resistance; 11-a third resistance; 12-a triode; 13-second sampling resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the utility model and do not delimit the utility model.
The following describes a multi-channel interleaved PFC circuit, a power factor correction device, and an electrical appliance according to an embodiment of the present invention with reference to the accompanying drawings.
Example 1
The embodiment provides a multi-path interleaved PFC circuit, as shown in fig. 1, the multi-path interleaved PFC circuit includes a plurality of parallel PFCs, the PFC includes an IGBT, wherein an IGBT gate of at least one path of the PFC is connected to a low current cut-off control module, the low current cut-off control module is connected to a control chip, the control chip is connected to a current sampling circuit, and the control chip controls the low current cut-off control module to switch the IGBT into or out of a circuit according to current data collected by the current sampling circuit, so as to control the number of paths of the PFCs that operate simultaneously. According to the arrangement, the low current cut-off control module can be controlled according to current data collected by the current sampling circuit, the IGBT is connected into the PFC circuit or disconnected, the operation power consumption of an electric appliance is controlled according to actual requirements, the situation of energy waste is avoided, specifically, in the embodiment, the number of PFC circuits of the connection circuit can be controlled according to the actually collected current, so that more multiple paths of PFC circuits are connected into the circuit when a large current is operated, the normal operation of the system is ensured, part of the PFC circuits are disconnected when the low current is operated, only one path of PFC operation is reserved at the lowest time, under the condition of ensuring the normal operation of the equipment, the power factor of the PFC circuit is obviously improved when the single path or low path number of PFC operations are operated, the power consumption of the PFC circuit is greatly reduced, the energy consumption of the electric appliance is reduced, and the electric appliance adopting the circuit can meet the national low power consumption requirement.
As an embodiment of the present invention, the low current cut-off control module includes a transistor 12, a gate of the transistor 12 is connected to the control chip, a collector of the transistor 12 is connected to a gate of the IGBT and an input terminal of the IGBT driving information signal, respectively, and an emitter of the transistor 12 is grounded. Under the condition, when the input level of the control chip enables the triode 12 to be in a conducting state, because the triode 12 is conducted to the ground, the IGBT driving information number cannot reach the gate pole of the IGBT, the IGBT cannot be started, the disconnection of the PFC and the main circuit is controlled, and the operation is not participated, when the disconnection level input of the control chip enables the triode 12 to be in a cut-off state, the IGBT driving information number reaches the gate pole of the IGBT, the IGBT starts to operate, one path of PFC is added in the main circuit to operate synchronously, the connection and disconnection of multiple paths of PFC can be easily completed only through the arrangement of the triode 12, the number of the PFC paths participating in operation can be adjusted according to actual requirements in the operation process of the equipment, when the low-current operation is carried out, redundant PFC is timely disconnected, and under the condition that the normal operation of the equipment is ensured, the power consumption of the equipment can be greatly reduced.
As an embodiment of the present invention, a first resistor 9 is disposed between the input terminal of the IGBT driving information signal and the gate of the IGBT and the collector of the transistor 12, and the first resistor 9 is a current limiting resistor for preventing the transistor 12 from being damaged by excessive current. This arrangement protects transistor 12 from excessive current damage and improves the safety of use of the low current cutoff control module.
In this embodiment, a second resistor 10 is disposed between the control chip and the gate of the transistor 12, and the second resistor 10 is a current-limiting resistor for preventing the transistor 12 from being damaged by excessive current. This arrangement protects transistor 12 from excessive current damage and improves the safety of use of the low current cutoff control module.
As a preferred embodiment of the present invention, a third resistor 11 connected to ground is further disposed between the gate of the transistor 12 and the control chip, and the third resistor 11 is a pull-down resistor for preventing the transistor 12 from malfunctioning due to electromagnetic noise interference. If there is no third resistor 11, the triode 12 is in a suspended state, and the gate pole of the triode 12 is easily interfered by the external high level to execute misoperation, so that the gate pole of the triode 12 is always in a low level state when there is no high level input, thereby preventing the possible high level interference from causing malfunction of the triode 12, greatly improving the control safety and accuracy of the triode 12, and ensuring the normal and stable operation of the equipment.
As an embodiment of the present invention, each of the parallel PFCs further includes an inductor and a diode, wherein a collector of the IGBT is connected to the inductor and the diode, respectively, and an emitter of the IGBT is grounded. It should be understood that in each PFC circuit, an inductor, a diode and a capacitor are sequentially arranged in series, a collector of the IGBT is connected between the inductor and the diode, the arrangement is such that the inductor stores energy when the IGBT is turned on, an induced voltage is generated on the inductor when the IGBT is turned off, the capacitor is charged by the energy stored when the IGBT is turned on through the diode, the inductor also has a function of limiting a surge current of the capacitor because the current on the inductor cannot suddenly change, thereby effectively protecting the capacitor, the diode is used for boosting so that the capacitor outputs a high-voltage direct current, specifically, one end of the inductor is connected to a positive electrode of the power supply, the other end of the inductor is connected to a positive electrode of the diode and a collector of the IGBT, the positive electrode of the diode is connected to the collector of the IGBT and the inductor, a negative electrode of the diode is connected to a positive electrode of the capacitor, a negative electrode of the capacitor, And an emitting electrode of the IGBT is connected with the negative electrode of the power supply and is grounded, wherein the inductor and the diode are arranged in series with the capacitor, and the IGBT is arranged in parallel with the capacitor.
Preferably, in the IGBT connected to the low-current cutoff control module, the emitter of the IGBT is grounded through the second sampling resistor 13. In general, in the using process of the IGBT, a corresponding overcurrent protection circuit needs to be arranged to prevent the IGBT from being damaged due to an excessive current, and the second sampling resistor 13 is used to provide corresponding current data to the overcurrent protection circuit to cooperate with the overcurrent protection circuit to protect the IGBT from being damaged by the excessive current, thereby ensuring the safety of the operation of the IGBT.
In this embodiment, the current sampling circuit includes a first sampling resistor 8, the first sampling resistor 8 is connected with the PFC bus for sampling current data of the PFC bus, and the number of PFC circuits can be increased or decreased according to the current data acquired by the first sampling resistor 8, so that the PFC can be switched on or off according to actual requirements, thereby effectively avoiding a situation that all PFC circuits participate in operation under a low-current operation condition, and greatly reducing energy consumption under the low-current condition.
Specifically in this embodiment, still include the parallelly connected electric capacity that sets up of a plurality of, the electric capacity is used for energy storage and filtering to promote the energy storage effect of circuit, guarantee the normal operating of equipment, a plurality of parallelly connected setting the electric capacity forms the electric capacity group, and inductor, diode and electric capacity group series connection on each way IGBT set up, in each way IGBT with electric capacity group sets up in parallel.
Example 2
This embodiment is a further implementation manner of embodiment 1, in this embodiment, as shown in fig. 1, the multi-path interleaved PFC circuit has two paths of PFCs, where the first path of PFC includes a first IGBT1, a first inductor 2, and a first diode 3, one end of the first inductor 2 is connected to the power supply input end DBV +, the other end is connected to the collector of the first IGBT1 and the first diode 3, one end of the first diode 3 is connected to the collector of the first IGBT1 and the first inductor 2, and the other end is connected in series to a capacitor bank, in this embodiment, the capacitor bank includes 3 electrolytic capacitors 4 arranged in parallel, the emitter of the first IGBT1 is grounded, and the first sampling resistor 8 is arranged between the first IGBT1 and the power supply input end DBV-.
The second PFC circuit includes a second IGBT5, a second inductor 6, and a second diode 7, one end of the second inductor 6 is connected to the power input end DBV +, the other end is connected to the collector of the second IGBT5 and the second diode 7, one end of the second diode 7 is connected to the collector of the second IGBT5 and the second inductor 6, the other end is connected to the capacitor bank in series, and the emitter of the second IGBT5 is grounded through the second sampling resistor 13.
In this embodiment, the gate of the second IGBT5 in the second PFC is connected to the low current cut-off control module, wherein the connection mode of the triode 12 and the optimally set first resistor 9, second resistor 10, and third resistor 11 are the same as those in embodiment 1, and are not described herein again.
Specifically, the PFC circuit provided in this embodiment is controlled in the following manner:
electrifying: when the circuit is powered on, all the PFC circuits do not work, the electrolytic capacitor 4 is charged, and when the working condition of the circuit reaches the preset working condition of the singlechip, the input level pin of the control chip continuously inputs a 5V level, so that the triode 12 is in a conducting state; in the present embodiment, the preset working condition is that the electrolytic capacitor 4 is charged for a preset time, and in some alternative embodiments, the preset time is 2 s.
Low current operation process: the device starts low-current operation, the PFC is started when the PFC starting threshold condition is reached, the single chip microcomputer chip sends an IGBT gate driving signal at the moment, the first PFC is normally operated, the triode 12 is conducted to the ground, the second IGBT gate driving signal cannot reach the gate of the second IGBT5, the second PFC cannot be started, and the second PFC is in a single PFC operation state at the moment; the PFC starting threshold is specifically a threshold of the current data collected in the first sampling resistor 8, and in some embodiments, the PFC starting threshold is 2A.
The large-current operation process comprises the following steps: when the current sampling circuit detects that the current reaches the condition of opening the multi-path threshold, the input level pin of the control chip cuts off the output of 5V, so that the triode 12 is in a cut-off state, at the moment, the second IGBT gate pole driving signal reaches the gate pole of the second IGBT5, the second IGBT5 starts to operate, the second PFC is opened, and the second PFC is in a multi-path PFC operation state; the turn-on multi-path threshold is specifically a threshold of the current data collected in the first sampling resistor 8, and in some embodiments, the turn-on multi-path threshold is 10A. It should be noted that, the PFC start threshold and the start multi-path threshold listed in this embodiment are preset values, and may be specifically set according to specific conditions of the device.
It should be understood that, in this embodiment, only the structure and operation control scheme including two PFC circuits are enumerated, and in fact, the structure and control scheme may also be used for a circuit including more than three PFCs, and in the operation process, the number of PFC circuits that need to be turned on or turned off may be freely combined according to actual sampled current data, so as to achieve the technical effect that the number of connected PFC circuits automatically changes along with the operation current of the device, thereby greatly reducing the number of PFC circuits that are connected when the device operates at a low current, and reducing the power consumption of the device.
Example 3
The present embodiment provides a power factor correction device, which includes the multiple interleaved PFC circuit according to embodiment 1 or embodiment 2.
The advantages of the PFC device provided in this embodiment over the prior art are the same as those of the multi-channel interleaved PFC circuit described in embodiment 1 or 2, and are not repeated herein.
Example 4
This embodiment discloses an electric appliance including the multiple interleaved PFC circuit as described in embodiment 1 or 2, or including the power factor correction device as described in embodiment 3.
The advantages of the electrical apparatus provided in this embodiment over the prior art are the same as those of the multi-channel interleaved PFC circuit described in embodiment 1 or 2 or the power factor correction device described in embodiment 3, and are not repeated herein.
It should be noted that the electrical appliances described in the present embodiment include, but are not limited to, air conditioners, refrigerators, washing machines, televisions, and other household electrical appliances.
It should be noted that all terms used in the present invention for directional and positional indication, such as: the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "lower", "head", "tail", "center", and the like are used only for explaining the relative positional relationship, connection, and the like between the respective members in a certain state, and are used only for convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a certain orientation, and thus, should not be construed as limiting the present invention. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The multi-path interleaved PFC circuit is characterized by comprising a plurality of paths of PFCs connected in parallel, wherein each PFC comprises an IGBT, the IGBT gate pole of at least one path of PFC is connected with a low-current cut-off control module, the low-current cut-off control module is connected with a control chip, the control chip is connected with a current sampling circuit, and the control chip controls the low-current cut-off control module to switch the IGBTs into the circuit or switch the IGBTs out according to current data collected by the current sampling circuit so as to control the number of paths of PFCs working simultaneously.
2. The multi-interleaved PFC circuit according to claim 1, wherein the low current cutoff control module comprises a transistor (12), a gate of the transistor (12) is connected to the control chip, a collector of the transistor (12) is connected to a gate of the IGBT and an IGBT driving information signal input terminal, respectively, and an emitter of the transistor (12) is grounded.
3. The multi-interleaved PFC circuit according to claim 2, wherein a first resistor (9) is disposed between the IGBT driving signal input terminal and the IGBT gate and the collector of the transistor (12), and the first resistor (9) is a current limiting resistor for preventing the transistor (12) from being damaged by excessive current.
4. The multiple interleaved PFC circuit according to claim 2, wherein a second resistor (10) is disposed between the control chip and the gate of the transistor (12), and the second resistor (10) is a current limiting resistor for preventing the transistor (12) from being damaged by excessive current.
5. The multiple interleaved PFC circuit according to claim 2, wherein a third resistor (11) connected to ground is disposed between the gate of the transistor (12) and the control chip, and the third resistor (11) is a pull-down resistor for preventing the transistor (12) from malfunctioning due to electromagnetic noise interference.
6. The multiple interleaved PFC circuit of claim 1 wherein each parallel PFC further comprises an inductor and a diode, wherein the collector of the IGBT is connected to the inductor and the diode, respectively, and the emitter of the IGBT is connected to ground.
7. The multiple interleaved PFC circuit of claim 1 wherein in the IGBT connected to the low current cutoff control block, the emitter of the IGBT is grounded through a second sampling resistor (13).
8. The multiple interleaved PFC circuit of any of claims 1-7 wherein the current sampling circuit comprises a first sampling resistor (8), the first sampling resistor (8) coupled to the PFC bus for sampling current data from the PFC bus.
9. A power factor correction device comprising the multiple interleaved PFC circuit of any of claims 1-8.
10. An electrical appliance comprising a multiple interleaved PFC circuit according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122858649.5U CN216216512U (en) | 2021-11-22 | 2021-11-22 | Multi-path interleaved PFC circuit, power factor correction device and electric appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122858649.5U CN216216512U (en) | 2021-11-22 | 2021-11-22 | Multi-path interleaved PFC circuit, power factor correction device and electric appliance |
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| CN216216512U true CN216216512U (en) | 2022-04-05 |
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Effective date of registration: 20230601 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 519000 202, floor 2, building B, high tech Zone headquarters base, No. 2 Qianwan Second Road, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong Patentee before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. |