CN112511145A - Standby zero reactive power consumption control circuit in switching power supply - Google Patents
Standby zero reactive power consumption control circuit in switching power supply Download PDFInfo
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- CN112511145A CN112511145A CN202011407529.7A CN202011407529A CN112511145A CN 112511145 A CN112511145 A CN 112511145A CN 202011407529 A CN202011407529 A CN 202011407529A CN 112511145 A CN112511145 A CN 112511145A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/18—Modifications for indicating state of switch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
The invention discloses a standby zero reactive power consumption control circuit in a switching power supply, which comprises a main control switch arranged between a PFC circuit in the switching power supply and an alternating current power supply network, wherein the main control switch is disconnected when the PFC circuit does not work under the control of the control circuit; the method is characterized in that: the switch power supply is characterized by further comprising an auxiliary control switch and a current-limiting resistor, wherein the auxiliary control switch and the current-limiting resistor are connected in series and then connected to two ends of the main control switch in parallel, and the control circuit controls the auxiliary control switch to be closed and controls the main control switch to be closed after the auxiliary control switch is closed and the time delay is set when the switch power supply is connected to a load. When the switching power supply is connected to an alternating current power grid, after a circuit formed by connecting an auxiliary control switch and a current-limiting resistor in series is connected to two ends of a main control switch in parallel, the auxiliary control switch is controlled to be closed, so that the current in capacitors and inductors in a PFC is saturated by small current due to the limitation of the current-limiting resistor, and then the main control switch is closed, so that the instantaneous current is reduced.
Description
Technical Field
The invention relates to a standby zero reactive power consumption control circuit in a switching power supply.
Background
The switch power supply is an important part of the switch power supply in the charging device, converts commercial power into a direct current power supply for charging automobiles, and the front stage of the switch power supply is generally provided with a PFC circuit, so that a high power factor can be obtained when the PFC circuit works, but when the PFC circuit does not work, because devices such as a capacitor and an inductor at an input end are connected to an alternating current network, a lot of reactive power can be consumed, and the power factor is low.
The common practice is to use a controllable air switch or contactor or other switch at the input end of the power grid, and to disconnect this switch by a control signal when the PFC circuit is not operating to cut off the power supply of the rear-end reactive device. However, since the resistance of the reactive device in the PFC circuit is small, a large current is generated when the switch needs to be closed, and there is a risk that such a large current is increased instantaneously when the switch is closed.
Disclosure of Invention
Aiming at the defects that in the conventional switching power supply, a switch arranged between a PFC circuit and a power supply is disconnected when the PFC does not work, and the connection between a reactive device in the PFC and an alternating current power grid is cut off, so that the danger caused by the fact that when the PFC does not work, the reactive device is connected in the alternating current power grid to cause low power factor, and the PFC is connected into the alternating current power grid to generate large current instantly is avoided, and the standby zero reactive power consumption control circuit in the switching power supply is provided.
The technical scheme adopted by the invention for realizing the technical purpose is as follows: a standby zero reactive power consumption control circuit in a switching power supply comprises a main control switch arranged between a PFC circuit and an alternating current power supply network in the switching power supply, wherein the main control switch is disconnected when the PFC circuit does not work under the control of a control circuit; the switch power supply is characterized by further comprising an auxiliary control switch and a current-limiting resistor, wherein the auxiliary control switch and the current-limiting resistor are connected in series and then connected to two ends of the main control switch in parallel, and the control circuit controls the auxiliary control switch to be closed and controls the main control switch to be closed after the auxiliary control switch is closed and the time delay is set when the switch power supply is connected to a load.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: an EMC circuit is also arranged between a switch circuit formed by connecting the main control switch, the auxiliary control switch and the current-limiting resistor in series and the PFC circuit.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the alternating current power grid is a three-phase alternating current power supply, and the main control switch comprises a first main control switch K1 arranged on an A alternating current input and a third main control switch K3 arranged on a C alternating current input; the auxiliary control switch comprises a second auxiliary control switch K2 and a fourth auxiliary control switch K4, and the current limiting resistor comprises a first current limiting resistor TH1 and a second current limiting resistor TH 2; the second auxiliary control switch K2 is connected in series with the first current limiting resistor TH1 and then connected in parallel with the first main control switch K1 to form an A-phase switch circuit; the fourth auxiliary control switch K4 is connected in series with the second current limiting resistor TH2 and then connected in parallel with the third main control switch K3 to form a C-phase switch circuit.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the power supply also comprises an auxiliary circuit, and the auxiliary power supply comprises a rectifying circuit and a filtering circuit which are arranged between the A-phase alternating current and the B-phase alternating current.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the rectifying circuit comprises a rectifying diode D7, the filter circuit comprises an electrolytic capacitor E1, an A-phase alternating current is electrically connected with the anode of the diode D7, the anode of the diode D7 is connected with the anode of the electrolytic capacitor E1, and the cathode of the electrolytic capacitor E1 is connected with a B-phase alternating current.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the first current limiting resistor TH1 and the second current limiting resistor TH2 are thermistors.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the first main control switch K1, the third main control switch K3, the second auxiliary control switch K2 and the fourth auxiliary control switch K4 are relays controlled by a control circuit respectively.
Further, in the standby zero reactive power consumption control circuit in the switching power supply described above: the first main control switch K1, the third main control switch K3, the second auxiliary control switch K2 and the fourth auxiliary control switch K4 are electronic switches controlled by a control circuit respectively.
When the switching power supply is connected to an alternating current power grid, after a circuit formed by connecting an auxiliary control switch and a current-limiting resistor in series is connected to two ends of a main control switch in parallel, the auxiliary control switch is controlled to be closed, so that the current in capacitors and inductors in a PFC is saturated by small current due to the limitation of the current-limiting resistor, and then the main control switch is closed, so that the instantaneous current is reduced.
In addition, the invention also provides a three-phase standby zero reactive power consumption control circuit in the charging pile module.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic diagram of embodiment 1 of the present invention.
Detailed Description
Embodiment 1, this embodiment is a standby zero reactive power consumption control circuit in a three-phase switching power supply in a charging pile module. In practice, the switching power supply using the two-phase alternating current commercial power as the current can also use the standby zero reactive power consumption control circuit in the switching power supply.
As shown in fig. 1: in the figure, A, B, C connection points are respectively input of a three-phase power grid, a switch circuit is composed of relays K1, K2, K3, K4 and thermistors TH1 and TH2, and is referred to as a zero-reactive power control circuit, a first main control switch K1 is a relay K1, a third main control switch K3 is a relay K3, a second auxiliary control switch K2 is a relay K2, and a fourth auxiliary control switch K4 is a relay K4, and in practice, the relays K1, K2, K3 and K4 or other electronic switches such as MOS transistors, IGBTs, controllable silicon and the like are used.
The capacitors CX1, CX2, CX3 represent simplified EMC circuits, and the diodes D1, D2, D3, D4, D5, D6 represent rectifier bridge stacks or power frequency rectifier diodes of the PFC input part, or may be input diodes of a bridgeless PFC architecture. In the figure, a box PFC represents a PFC circuit, a box VCC represents an auxiliary power supply circuit of the whole machine, and a box control part represents software or hardware control of the whole machine and is used for controlling a relay or other circuits. Capacitor E1 is the bus capacitance of the PFC output. The invention provides a three-phase standby zero reactive power consumption control circuit in a charging pile module.
The specific working mode is as follows:
when alternating current is electrified, current flows from the phase A of the alternating current input through the resistor R1, the diode D7 and the capacitor E1, returns to the phase B through the diode D5, and charges the bus capacitor E1. After the bus capacitor reaches a certain voltage, the auxiliary power supply works to provide power for a control part (a control circuit) of the whole machine module. The control part firstly controls the relays K2 and K4 to be closed. The alternating voltage charges the capacitor of the EMC part and the bus capacitor, and when the bus capacitor is full, the control part controls the large relays K1 and K3 to be closed to bypass the thermistor. When the large relay is closed, the control section opens the small relays K2, K4. The phenomenon that the thermistor is burnt down due to interference or misoperation of the large relay is avoided. And then normal PFC starting operation is carried out.
When the PFC does not need to work, the small relays K2 and K4 are switched off. The control part directly closes the relays K1 and K3, and because only the phase B has voltage in the EMC input circuit and the other phases A and C have no voltage, an inductance-capacitance part of the EMC cannot form an effective current loop. Therefore, the function of zero idle consumption in standby is realized.
Although the bus capacitor E1 is charged at this time, the auxiliary power supply is still operating, but active power is consumed.
Claims (8)
1. A standby zero reactive power consumption control circuit in a switching power supply comprises a main control switch arranged between a PFC circuit and an alternating current power supply network in the switching power supply, wherein the main control switch is disconnected when the PFC circuit does not work under the control of a control circuit; the method is characterized in that: the switch power supply is characterized by further comprising an auxiliary control switch and a current-limiting resistor, wherein the auxiliary control switch and the current-limiting resistor are connected in series and then connected to two ends of the main control switch in parallel, and the control circuit controls the auxiliary control switch to be closed and controls the main control switch to be closed after the auxiliary control switch is closed and the time delay is set when the switch power supply is connected to a load.
2. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 1, wherein: an EMC circuit is also arranged between a switch circuit formed by connecting the main control switch, the auxiliary control switch and the current-limiting resistor in series and the PFC circuit.
3. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 1 or 2, wherein: the alternating current power grid is a three-phase alternating current power supply, and the main control switch comprises a first main control switch K1 arranged on an A alternating current input and a third main control switch K3 arranged on a C alternating current input; the auxiliary control switch comprises a second auxiliary control switch K2 and a fourth auxiliary control switch K4, and the current limiting resistor comprises a first current limiting resistor TH1 and a second current limiting resistor TH 2; the second auxiliary control switch K2 is connected in series with the first current limiting resistor TH1 and then connected in parallel with the first main control switch K1 to form an A-phase switch circuit; the fourth auxiliary control switch K4 is connected in series with the second current limiting resistor TH2 and then connected in parallel with the third main control switch K3 to form a C-phase switch circuit.
4. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 3, wherein: the power supply also comprises an auxiliary circuit, and the auxiliary power supply comprises a rectifying circuit and a filtering circuit which are arranged between the A-phase alternating current and the B-phase alternating current.
5. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 4, wherein: the rectifying circuit comprises a rectifying diode D7, the filter circuit comprises an electrolytic capacitor E1, an A-phase alternating current is electrically connected with the anode of the diode D7, the anode of the diode D7 is connected with the anode of the electrolytic capacitor E1, and the cathode of the electrolytic capacitor E1 is connected with a B-phase alternating current.
6. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 4, wherein: the first current limiting resistor TH1 and the second current limiting resistor TH2 are thermistors.
7. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 4, wherein: the first main control switch K1, the third main control switch K3, the second auxiliary control switch K2 and the fourth auxiliary control switch K4 are relays controlled by a control circuit respectively.
8. The control circuit for zero standby reactive power consumption in a switching power supply according to claim 4, wherein: the first main control switch K1, the third main control switch K3, the second auxiliary control switch K2 and the fourth auxiliary control switch K4 are electronic switches controlled by a control circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011407529.7A CN112511145A (en) | 2020-12-04 | 2020-12-04 | Standby zero reactive power consumption control circuit in switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011407529.7A CN112511145A (en) | 2020-12-04 | 2020-12-04 | Standby zero reactive power consumption control circuit in switching power supply |
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| CN112511145A true CN112511145A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011407529.7A Pending CN112511145A (en) | 2020-12-04 | 2020-12-04 | Standby zero reactive power consumption control circuit in switching power supply |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295918A (en) * | 2007-04-24 | 2008-10-29 | 艾默生网络能源系统有限公司 | Soft switching method for electric control switch of three-phase alternating-current input circuit |
| EP2362522A2 (en) * | 2010-02-25 | 2011-08-31 | EDAG GmbH & Co. KGaA | Charging device for an electric car |
| CN203086328U (en) * | 2012-11-29 | 2013-07-24 | 无锡市金赛德电子有限公司 | Intelligent power grid terminal power input surge suppression circuit |
| CN103390879A (en) * | 2012-05-10 | 2013-11-13 | 中兴通讯股份有限公司 | Alternating current power supply input high voltage protection device |
| CN104300777A (en) * | 2014-11-07 | 2015-01-21 | 深圳市永联科技有限公司 | Inverter synchronous grid connection method |
| CN106059349A (en) * | 2016-07-27 | 2016-10-26 | 海信（山东）空调有限公司 | Three-phase electric rectification circuit and three-phase electric rectification circuit time sequence control method |
| CN110994968A (en) * | 2019-11-22 | 2020-04-10 | 华为技术有限公司 | Pre-charging circuit, inverter and power generation system |
-
2020
- 2020-12-04 CN CN202011407529.7A patent/CN112511145A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295918A (en) * | 2007-04-24 | 2008-10-29 | 艾默生网络能源系统有限公司 | Soft switching method for electric control switch of three-phase alternating-current input circuit |
| EP2362522A2 (en) * | 2010-02-25 | 2011-08-31 | EDAG GmbH & Co. KGaA | Charging device for an electric car |
| CN103390879A (en) * | 2012-05-10 | 2013-11-13 | 中兴通讯股份有限公司 | Alternating current power supply input high voltage protection device |
| CN203086328U (en) * | 2012-11-29 | 2013-07-24 | 无锡市金赛德电子有限公司 | Intelligent power grid terminal power input surge suppression circuit |
| CN104300777A (en) * | 2014-11-07 | 2015-01-21 | 深圳市永联科技有限公司 | Inverter synchronous grid connection method |
| CN106059349A (en) * | 2016-07-27 | 2016-10-26 | 海信（山东）空调有限公司 | Three-phase electric rectification circuit and three-phase electric rectification circuit time sequence control method |
| CN110994968A (en) * | 2019-11-22 | 2020-04-10 | 华为技术有限公司 | Pre-charging circuit, inverter and power generation system |
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