CN215817541U - Power supply circuit for reducing reactive current - Google Patents
Power supply circuit for reducing reactive current Download PDFInfo
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- CN215817541U CN215817541U CN202121427736.9U CN202121427736U CN215817541U CN 215817541 U CN215817541 U CN 215817541U CN 202121427736 U CN202121427736 U CN 202121427736U CN 215817541 U CN215817541 U CN 215817541U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a power supply circuit for reducing reactive current, which has a pre-charging mode, a working mode and a standby mode; in the pre-charging mode, the switch switching module is connected with the current-limiting resistor and the working power supply module, and the alternating current input end supplies power to the working power supply module through the current-limiting resistor; in the working mode, the switch switching module is connected with the alternating current input end, the working power supply module and the standby power supply module, and the alternating current input end directly supplies power to the working power supply module and the standby power supply module; in the standby mode, the switch switching module is switched off, and the alternating current input end supplies power to the standby power supply module through the current limiting resistor; when the standby power supply module enters the standby mode, the standby power supply module does not need to pass through a rear-end filtering module, so that reactive current caused by the filtering module is eliminated, the reactive current can be effectively reduced, and the standby power consumption of a system is further reduced; the utility model has the advantages of simple structure, convenient operation and low cost.
Description
Technical Field
The present invention relates to a power supply circuit structure, and more particularly, to a power supply circuit for reducing reactive current.
Background
At present, the demand of high-power supplies is increasing, especially the demand of some high-power direct current power supplies. However, the capacity of the direct current power supply module is limited, multiple modules are often operated in parallel, the output energy of the multiple modules in parallel is several times of that of a single module, the power level of the direct current power supply is improved, meanwhile, the multiple modules work in parallel, the system has certain redundancy, the reliability of the whole system is improved, and the direct current power supply module can be flexibly combined according to actual requirements.
When the existing circuit is in a standby state, reactive current can be generated in the filter circuit, and particularly when the circuit is applied to a multi-module parallel power circuit, after a three-phase power grid is connected into the power circuit, the three-phase power grid firstly passes through the EMI filter circuit and then passes through the buffer resistor and the rectifier bridge, the bus voltage is slowly boosted, the auxiliary source is powered by the bus Cbus, and the standby circuit starts to work. When the standby circuit does not work, reactive current can be generated in the filter circuit, the reactive current monitored at the side access end of the power grid is large, the quality of the power grid is affected, and the standby power consumption of the system is large.
Fig. 1 is a schematic diagram of a conventional multi-module parallel structure, and when a power switching circuit is in a standby state, since reactive current generated by an input filter is connected in parallel, very large reactive current can be monitored by sampling at an alternating current input end, which not only affects the quality of a power grid, but also causes circuit loss.
In order to solve the problem that the quality of a power grid is affected by a large reactive current monitored by a power grid side access terminal in a standby state of the multi-module parallel power supply circuit, a power supply circuit with large output power, small standby power and small reactive current is urgently needed to be designed in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned defects in the prior art, the present invention provides a power supply circuit for reducing reactive current.
The technical scheme adopted by the utility model is to design a power supply circuit for reducing reactive current, which comprises an alternating current input end, a working power supply module and a working circuit connecting end which are connected in sequence, and also comprises a current limiting resistor, a standby power supply module and a standby circuit connecting end which are connected with the alternating current input end after being connected in series, and a switch switching module which is respectively connected with the alternating current input end, the current limiting resistor, the working power supply module and the standby power supply module; the output end of the standby power supply module is also connected with the standby circuit connecting end; the power supply circuit is provided with a pre-charging mode, a working mode and a standby mode; in the pre-charging mode, the switch switching module is connected with the current-limiting resistor and the working power supply module, and the alternating current input end supplies power to the working power supply module through the current-limiting resistor; in the working mode, the switch switching module is connected with the alternating current input end, the working power supply module and the standby power supply module, and the alternating current input end directly supplies power to the working power supply module and the standby power supply module; in the standby mode, the switch switching module is switched off, and the alternating current input end supplies power to the standby power supply module through the current limiting resistor.
When the alternating current input end is connected with the N-phase circuit, a current limiting resistor and a switch switching module can be arranged in the N-1-phase circuit.
In one embodiment, the alternating current input end comprises a U end, a V end and a W end, three-phase alternating current can be connected, the current limiting resistor comprises a first resistor R1 and a second resistor R2, and the switch switching module comprises a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the second resistor R2 is connected between the W end and the B input end, the third switch K3 is connected between the W end and the W1 input end, and the fourth switch K4 is connected between the B input end and the W1 input end; the input end A and the input end B are input ends of a standby power supply module, and the input end U1, the input end V and the input end W1 are input ends of a working power supply module.
In one embodiment, the ac input terminal includes a U terminal and a W terminal, and is connectable to a single-phase ac power, the current limiting resistor includes a first resistor R1, and the switching module includes a first switch K1 and a second switch K2; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the input end A and the input end W are input ends of a standby power supply module, and the input end U1 and the input end W are input ends of a working power supply module.
And the input end of the working power supply module is connected in series with the filtering module.
And the working power supply module is connected with the standby circuit connecting end through a sixth diode D6.
And the standby power supply module is connected with a standby circuit connecting end through a fifth diode D5.
When the alternating current input end is connected with a three-phase power supply, the working power supply module adopts a three-phase rectification circuit, and the standby power supply module adopts a single-phase rectification circuit or a three-phase rectification circuit.
When the alternating current input end is connected with a single-phase power supply, the working power supply module and the standby power supply module both adopt single-phase rectification circuits.
The technical scheme provided by the utility model has the beneficial effects that:
the utility model has the advantages of pre-charging mode, working mode and standby mode, has various functions, and particularly, when the system enters the standby mode, the standby power supply module does not need to pass through a filtering module at the rear end, thereby eliminating the reactive current caused by the filtering module, effectively reducing the reactive current and further reducing the standby power consumption of the system; the utility model has the advantages of simple structure, convenient operation and low cost.
Drawings
The utility model is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic block diagram of a prior art parallel operation of multiple power modules;
FIG. 2 is a functional block diagram of the present invention;
FIG. 3 is a circuit diagram of a three-phase configuration of the operational power supply module in accordance with an embodiment of the present invention;
FIG. 4 is a circuit diagram of an embodiment of the present invention in which the operational power supply module is of a single-phase configuration and uses a current limiting resistor;
fig. 5 is a circuit diagram of an operational power supply module in a single-phase configuration and using two current limiting resistors in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The utility model discloses a power supply circuit for reducing reactive current, which comprises an alternating current input end, a working power supply module, a working circuit connecting end, a current limiting resistor, a standby power supply module, a standby circuit connecting end and a switch switching module, wherein the alternating current input end, the working power supply module and the working circuit connecting end are sequentially connected with one another; and the output end of the standby power supply module is also connected with the standby circuit connecting end.
A power supply circuit for reducing reactive current has a pre-charge mode, an operating mode and a standby mode. In the pre-charging mode, the switch switching module is connected with the current-limiting resistor and the working power supply module, and the alternating current input end supplies power to the working power supply module through the current-limiting resistor. Due to the current limiting effect of the current limiting resistor, the current in the circuit is relatively small, the current impact effect is small, the buffering and pre-charging effect is achieved, the electric appliance can be protected, and the service life is prolonged. In the working mode, the switch switching module is connected with the alternating current input end, the working power supply module and the standby power supply module, the alternating current input end directly supplies power to the working power supply module and the standby power supply module, at the moment, the current-limiting resistor is equivalently short-circuited, the operation is quitted, the operation is not functional, and the power supply enters high-power operation. In the standby mode, the switch switching module is switched off, the alternating current input end supplies power to the standby power supply module through the current limiting resistor, the working power supply module quits running, reactive current is effectively reduced, and standby power consumption of the whole system is further reduced.
When the alternating current input end is connected with the N-phase circuit, a current limiting resistor and a switch switching module can be arranged in the N-1-phase circuit.
Referring to fig. 3, in one embodiment, the ac input terminal includes a U terminal, a V terminal, and a W terminal, a three-phase ac power can be connected, the current limiting resistor includes a first resistor R1 and a second resistor R2, and the switching module includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the second resistor R2 is connected between the W end and the B input end, the third switch K3 is connected between the W end and the W1 input end, and the fourth switch K4 is connected between the B input end and the W1 input end; the input end A and the input end B are input ends of a standby power supply module, and the input end U1, the input end V and the input end W1 are input ends of a working power supply module.
Referring to fig. 4, in one embodiment, the ac input terminal includes a U terminal and a W terminal, and is capable of connecting a single-phase ac power, the current limiting resistor includes a first resistor R1, and the switching module includes a first switch K1 and a second switch K2; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the input end A and the input end W are input ends of a standby power supply module, and the input end U1 and the input end W are input ends of a working power supply module.
In a preferred embodiment, the input end of the working power supply module is connected in series with the filtering module. Fig. 3 shows L1, L2 and L3, and fig. 4 shows L1 and L3.
In a preferred embodiment, the working power supply module is connected to the standby circuit connection terminal through a sixth diode D6. And the standby power supply module is connected with a standby circuit connecting end through a fifth diode D5. Therefore, the working power supply module and the standby power supply module can supply power to the standby circuit, and the power supply reliability can be improved. Due to the action of the fifth diode D5 and the sixth diode D6, current does not flow reversely, and the working power supply module and the standby power supply module can be protected.
Referring to fig. 3, one embodiment is shown, the ac input terminal includes a U terminal, a V terminal, and a W terminal to connect three-phase ac; the working power supply module adopts a three-phase rectification circuit, and the input ends of the three-phase rectification circuit are a U1 input end, a V1 input end and a W1 input end. The standby power supply module adopts a single-phase rectification circuit or a three-phase rectification circuit. The working power supply module adopts a three-phase rectifying circuit to provide high-power output for the working circuit.
Referring to fig. 4, in an embodiment, the ac input terminal includes a U terminal and a W terminal to connect single-phase ac power, and the working power supply module and the standby power supply module both use single-phase rectification circuits. The structure can be suitable for places such as families and the like with single-phase alternating current. It should be noted that the embodiment shown in fig. 3 can also be applied to a single-phase ac place, and with U-phase and W-phase, the electrical components on the V-phase will be left vacant.
It should be noted that when the ac input terminal is connected to a single-phase ac, two current-limiting resistors and two sets of switching modules may be used. Referring to fig. 5, namely, the current limiting resistor includes a first resistor R1 and a second resistor R2, the switch switching module includes a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4. The connection method is the same as the structure of the AC input end of FIG. 3 for connecting three-phase AC.
In a preferred embodiment, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are relays.
The working principle when the ac input is connected to a three-phase ac will be described in detail with reference to fig. 3: in the pre-charging mode, the first switch K1 and the third switch K3 are turned off, and the second switch K2 and the fourth switch K4 are turned on; alternating current enters the working power supply module through the current limiting resistors R1, R2, K2 and K4, and rectified direct current energy is stored on the bus capacitor Cbus. And after the pre-charging is finished, the working mode is entered, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are switched on, the current-limiting resistor is short-circuited and exits from running, and the alternating current is directly fed into the working power supply module. When the system enters the standby mode, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are turned off. The alternating current flows to a standby power supply module through a current-limiting resistor, the standby power supply module comprises a full-bridge rectifying circuit formed by D1, D2, D3 and D4, an upper bridge arm is connected with the positive pole, and a lower bridge arm is connected with the negative pole. The positive electrode and the negative electrode supply power to the standby circuit, and the alternating current does not pass through the filter circuit and cannot generate reactive current.
The working principle when the ac input is connected to a three-phase ac will be described in detail with reference to fig. 4: when the alternating current input end is connected with single-phase alternating current: in the pre-charging mode, the first switch K1 is turned off, and the second switch K2 is turned on; in the working mode, the first switch K1 and the second switch K2 are conducted; in the standby mode, the first switch K1 and the second switch K2 are turned off.
The embodiment shown with reference to fig. 5 operates in a similar manner to the embodiment shown in fig. 3: the alternating current input end is connected with single-phase alternating current, and in the pre-charging mode, the first switch K1 and the third switch K3 are disconnected, and the second switch K2 and the fourth switch K4 are connected; in the working mode, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are turned on; in the standby mode, the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are turned off.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (9)
1. A power supply circuit for reducing reactive current comprises an alternating current input end, a working power supply module and a working circuit connecting end which are connected in sequence, and is characterized by also comprising a current limiting resistor, a standby power supply module and a standby circuit connecting end which are connected with the alternating current input end after being connected in series, and a switch switching module which is respectively connected with the alternating current input end, the current limiting resistor, the working power supply module and the standby power supply module; the output end of the standby power supply module is also connected with the standby circuit connecting end; the power supply circuit is provided with a pre-charging mode, a working mode and a standby mode;
in the pre-charging mode, the switch switching module is connected with the current-limiting resistor and the working power supply module, and the alternating current input end supplies power to the working power supply module through the current-limiting resistor;
in the working mode, the switch switching module is connected with the alternating current input end, the working power supply module and the standby power supply module, and the alternating current input end directly supplies power to the working power supply module and the standby power supply module;
in the standby mode, the switch switching module is switched off, and the alternating current input end supplies power to the standby power supply module through the current limiting resistor.
2. A reduced reactive current power supply circuit as defined in claim 1, wherein when said ac input is connected to N-phase lines, a current limiting resistor and a switch switching module are provided in the N-1 phase lines.
3. The reactive current reducing power supply circuit of claim 2, wherein the ac input terminal comprises a U terminal, a V terminal and a W terminal, a three-phase ac power can be connected, the current limiting resistor comprises a first resistor R1 and a second resistor R2, the switch switching module comprises a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the second resistor R2 is connected between the W end and the B input end, the third switch K3 is connected between the W end and the W1 input end, and the fourth switch K4 is connected between the B input end and the W1 input end; the input end A and the input end B are input ends of a standby power supply module, and the input end U1, the input end V and the input end W1 are input ends of a working power supply module.
4. The reactive current reducing power supply circuit of claim 2, wherein the ac input terminal comprises a U terminal and a W terminal, a single-phase ac power can be connected, the current limiting resistor comprises a first resistor R1, and the switching module comprises a first switch K1 and a second switch K2; the first resistor R1 is connected between the U end and the A input end, the first switch K1 is connected between the U end and the U1 input end, and the second switch K2 is connected between the A input end and the U1 input end; the input end A and the input end W are input ends of a standby power supply module, and the input end U1 and the input end W are input ends of a working power supply module.
5. A reduced reactive current mains supply circuit as claimed in any one of claims 3 or 4, characterised in that the input of the working supply module is connected in series with a filtering module (L1, L2, L3).
6. A reduced reactive current power supply circuit as claimed in claim 1, wherein said operational power supply module is connected to the standby circuit connection through a sixth diode D6.
7. A reduced reactive current power supply circuit as claimed in claim 1, wherein said standby power supply module is connected to the standby circuit connection through a fifth diode D5.
8. A power supply circuit for reducing reactive current according to claim 3, wherein said working power supply module employs a three-phase rectifier circuit, and said standby power supply module employs a single-phase rectifier circuit or a three-phase rectifier circuit.
9. A reduced reactive current power supply circuit as claimed in claim 4, wherein said active and standby power supply modules each employ a single phase rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121427736.9U CN215817541U (en) | 2021-06-25 | 2021-06-25 | Power supply circuit for reducing reactive current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121427736.9U CN215817541U (en) | 2021-06-25 | 2021-06-25 | Power supply circuit for reducing reactive current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817541U true CN215817541U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121427736.9U Active CN215817541U (en) | 2021-06-25 | 2021-06-25 | Power supply circuit for reducing reactive current |
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|---|---|
| CN (1) | CN215817541U (en) |
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2021
- 2021-06-25 CN CN202121427736.9U patent/CN215817541U/en active Active
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Address after: 518000 Fengyun Science and Technology Building, No. 5 Industrial Zone, North Ring Road, Nanshan District, Shenzhen City, Guangdong Province, 501 Patentee after: Shenzhen Weimeisi New Energy (Group) Co.,Ltd. Country or region after: China Address before: 518000, 5 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: Shenzhen Vmax Power Co.,Ltd. Country or region before: China |