CN111030437A - Switching power supply and discharge method - Google Patents
Switching power supply and discharge method Download PDFInfo
- Publication number
- CN111030437A CN111030437A CN201911369141.XA CN201911369141A CN111030437A CN 111030437 A CN111030437 A CN 111030437A CN 201911369141 A CN201911369141 A CN 201911369141A CN 111030437 A CN111030437 A CN 111030437A
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- Prior art keywords
- power supply
- switching power
- bus capacitor
- relay
- protection circuit
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 73
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims 2
- 230000007257 malfunction Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/062—Avoiding or suppressing excessive transient voltages or currents
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
本发明提供了一种开关电源及放电方法，其中，在开关电源中，整流电路的第一端、第二端与开源电源的输入端连接，整流电路的第三端、第四端与开源电源的输出端连接；交流继电器的第一端、第二端与开源电源的输入端连接，交流继电器的第三端、第四端与开源电源的输出端连接；母线电容的一端与交流继电器的第五端连接，母线电容的另一端与整流电路的第三端连接；放电电阻的一端与整流电路的第三端连接，放电电阻的另一端与交流继电器的第四端连接。通过本发明，解决了相关技术中多联机开关电源母线电容在电源掉电后无法快速放电的问题，防止了在母线电容的供电的条件下出现控制电路紊乱产生误动作现象，提高了开关电源的使用寿命。
The invention provides a switching power supply and a discharging method, wherein, in the switching power supply, the first end and the second end of the rectifier circuit are connected to the input end of the open source power supply, and the third end and the fourth end of the rectifier circuit are connected to the open source power supply The first and second ends of the AC relay are connected to the input end of the open source power supply, and the third and fourth ends of the AC relay are connected to the output end of the open source power supply; one end of the bus capacitor is connected to the first end of the AC relay. The five terminals are connected, the other end of the bus capacitor is connected to the third terminal of the rectifier circuit; one end of the discharge resistor is connected to the third terminal of the rectifier circuit, and the other end of the discharge resistor is connected to the fourth terminal of the AC relay. The invention solves the problem in the related art that the bus capacitor of the multi-line switching power supply cannot be rapidly discharged after the power supply is powered off, prevents the disorder of the control circuit and causes the malfunction under the condition of the power supply of the bus capacitor, and improves the performance of the switching power supply. service life.
Description
Technical Field
The invention relates to the field of electric power, in particular to a switching power supply and a discharging method.
Background
In the final assembly production process of the multi-split air conditioner external unit, the assembled air conditioner external unit needs to be subjected to power-on test, and meanwhile, hardware of the whole air conditioner external unit can be detected through professional computer software. And when the test result is qualified, cutting off the power supply of the multi-connected outdoor unit, and sending the tested air conditioner outdoor unit to a refrigerant filling station. During filling, the problems that the refrigerant cannot be added or the addition amount is insufficient and the like often occur, so that the phenomenon of secondary filling of the refrigerant occurs. The investigation shows that after the multi-connected outdoor unit is powered off, the switching power supply can stop working after a long time because the bus capacitor of the switching power supply still stores a large amount of electric energy. This results in the electronic expansion valve being in an uncontrolled working state, and continuing to keep working depending on the residual electric quantity of the bus capacitor, and finally the electronic expansion valve is in a state of almost complete closing, resulting in that the subsequent refrigerant filling cannot be carried out.
In view of the above problems in the related art, no effective solution exists at present.
Disclosure of Invention
The embodiment of the invention provides a switching power supply and a discharging method, which at least solve the problem that a bus capacitor of a multi-online switching power supply cannot be rapidly discharged after power failure in the related technology.
According to an embodiment of the present invention, there is provided a switching power supply including: the device comprises a rectifying circuit, an alternating current relay, a bus capacitor and a discharge resistor; the first end and the second end of the rectifying circuit are connected with the input end of the open source power supply, and the third end and the fourth end of the rectifying circuit are connected with the output end of the open source power supply; the first end and the second end of the alternating current relay are connected with the input end of the open source power supply, and the third end and the fourth end of the alternating current relay are connected with the output end of the open source power supply; one end of the bus capacitor is connected with the fifth end of the alternating current relay, and the other end of the bus capacitor is connected with the third end of the rectifying circuit;
one end of the discharge resistor is connected with the third end of the rectifying circuit, and the other end of the discharge resistor is connected with the fourth end of the alternating current relay.
Optionally, when the switching power supply is powered on, one end of the bus capacitor is connected with a third end of the ac relay to form a loop, so as to charge the bus capacitor; and under the condition that the switching power supply is powered off, one end of the bus capacitor is connected with the fourth end of the alternating current relay to form a loop with the discharge resistor, so that the bus capacitor releases the stored electric energy through the discharge resistor.
Optionally, the switching power supply further includes: an overcurrent protection circuit; the overcurrent protection circuit is connected in series between the rectifying circuit and the input end.
Optionally, the over-current protection circuit includes: and the protective tube is connected between the rectifying circuit and the input end in series.
Optionally, the switching power supply further includes: an overvoltage protection circuit, wherein the overvoltage protection circuit is connected in parallel to the switching power supply.
Optionally, the overvoltage protection circuit comprises a bidirectional regulator tube and a first capacitor; the bidirectional voltage-regulator tube is connected with the first capacitor in parallel.
According to an embodiment of the present invention, there is provided a method for discharging a bus capacitor in a switching power supply, including: acquiring the power-on condition of the switching power supply; and determining whether to discharge the bus capacitor according to the power-on condition of the switching power supply.
Optionally, the switching power supply comprises: the device comprises a rectifying circuit, an alternating current relay and a discharge resistor; determining whether to discharge the bus capacitor according to the power-on condition of the switching power supply, including: under the condition that the switching power supply is electrified, triggering the bus capacitor to be connected with the alternating current relay end to form a loop to charge the bus capacitor; and under the condition that the switching power supply is powered off, triggering the bus capacitor to be connected with the alternating current relay to form a loop with the discharge resistor, so that the bus capacitor releases the stored electric energy through the discharge resistor.
Optionally, the switching power supply further comprises an overcurrent protection circuit; the method further comprises the following steps: and controlling the current input into the switching power supply through the overcurrent protection circuit.
Optionally, the switching power supply further comprises an overvoltage protection circuit; the method further comprises the following steps: and controlling the voltage of the switching power supply through the overvoltage protection circuit.
According to the invention, under the condition that the switching power supply is electrified, one end of the bus capacitor is connected with the third end of the alternating current relay to form a loop so as to charge the bus capacitor; under the condition that the switching power supply is powered off, one end of the bus capacitor is connected with the fourth end of the alternating current relay to form a loop with the discharge resistor, so that the bus capacitor releases stored electric energy through the discharge resistor, the problem that the bus capacitor of the multi-online switching power supply cannot discharge quickly after the power supply is powered off in the related technology is solved, the phenomenon of misoperation caused by disorder of a control circuit under the condition of power supply of the bus capacitor is prevented, and the service life of the switching power supply is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a circuit schematic of a switching power supply according to an embodiment of the invention;
fig. 2 is an alternative circuit schematic of a switching power supply according to an embodiment of the invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
In the present embodiment, there is provided a switching power supply, as shown in fig. 1, including: the device comprises a rectifying circuit, an alternating current relay, a bus capacitor and a discharge resistor; the first end and the second end of the rectifying circuit are connected with the input end of the open source power supply, and the third end and the fourth end of the rectifying circuit are connected with the output end of the open source power supply; the first end and the second end of the alternating current relay are connected with the input end of the open source power supply, and the third end and the fourth end of the alternating current relay are connected with the output end of the open source power supply; one end of the bus capacitor is connected with the fifth end of the alternating current relay, and the other end of the bus capacitor is connected with the third end of the rectifying circuit; one end of the discharge resistor is connected with the third end of the rectifying circuit, and the other end of the discharge resistor is connected with the fourth end of the alternating current relay.
Under the condition that the switching power supply is electrified, one end of the bus capacitor is connected with the third end of the alternating current relay to form a loop, and the loop charges the bus capacitor; and under the condition that the switching power supply is powered off, one end of the bus capacitor is connected with the fourth end of the alternating current relay to form a loop with the discharge resistor, so that the bus capacitor releases the stored electric energy through the discharge resistor. It should be noted that, the bus capacitor can be quickly isolated after power failure, and the colleagues also isolate the hazard source, so that the electric shock hazard in the process of air conditioner disassembly, maintenance and the like is avoided.
Optionally, the switching power supply in this embodiment further includes: an overcurrent protection circuit; the overcurrent protection circuit is connected in series between the rectifying circuit and the input end. In an optional implementation manner of this embodiment, the over-current protection circuit includes: and the protective tube is connected between the rectifying circuit and the input end in series.
Optionally, the switching power supply in this embodiment further includes: and the overvoltage protection circuit is connected in parallel to the switching power supply. In an optional implementation manner of the embodiment, the overvoltage protection circuit comprises a bidirectional voltage regulator tube and a first capacitor; the bidirectional voltage-regulator tube is connected with the first capacitor in parallel.
It should be noted that the present application is applicable not only to a single-phase ac circuit, but also to a three-phase ac circuit with appropriate modifications of the circuit.
The present application will be illustrated with reference to alternative embodiments of the present embodiment;
as shown in fig. 2, after the ac power source is rectified by the full bridge, the power supply state of the ac power source is detected; when the alternating current power supply is detected to supply power, the circuit can control the conduction of a bus capacitor for filtering, and the back-end circuit can obtain stable direct current voltage. When the alternating current power supply is detected to be powered down, the core control circuit can automatically cut off a power supply loop of a bus capacitor of the switching power supply at the moment, and independent discharge of the bus capacitor is completed.
The specific process is as follows: an alternating current power supply is input from a CN1 terminal, and enters a rectifier bridge circuit after a series of measures such as interference reduction, overvoltage protection, overcurrent protection and the like. The alternating current voltage is converted into pulsating direct current voltage under the action of full-bridge rectification. The ac power source passes through the coil of the ac relay while passing through the CN1 terminal. When current is applied to the coil of the relay, a magnetic field is generated to attract the armature of the relay. It can thus be seen that the contacts 3 and 5 of the ac relay are closed after power-up.
The rectified voltage of the rectifier bridge charges a bus capacitor of the switching power supply through a path formed by a contact 3 and a contact 5 of the alternating current relay. The pulsating direct current voltage forms pure direct current voltage under the filtering action of the bus capacitor. And supplying power to the back-end switch power supply through the HIGVOL port and the AGND port.
When the alternating current power supply is powered off, no current flows through the coil of the alternating current relay any more, the armature of the relay restores the initial state, and the contact 4 and the contact 5 are connected. And a bus capacitor of the switching power supply is isolated from the rear-end power supply circuit. And forms a loop with the discharge resistor R7, and the bus capacitor discharges the stored electric energy through the discharge resistor.
The embodiment also provides a discharging method of a bus capacitor in the switching power supply, and the method comprises the following steps:
step S102, acquiring the power-on condition of the switching power supply;
and step S104, determining whether to discharge the bus capacitor according to the power-on condition of the switching power supply.
Wherein, switching power supply in this implementation includes: the device comprises a rectifying circuit, an alternating current relay and a discharge resistor; based on this, the method for determining whether to discharge the bus capacitor according to the power-on condition of the switching power supply in step S104 may further include:
step S104-11, under the condition that the switching power supply is electrified, triggering a bus capacitor to be connected with an alternating current relay end to form a loop to charge the bus capacitor;
and step S104-12, under the condition that the switching power supply is powered off, triggering the bus capacitor to be connected with the alternating current relay to form a loop with the discharge resistor, so that the bus capacitor releases the stored electric energy through the discharge resistor.
Wherein, switching power supply still includes overcurrent protection circuit, still includes based on this embodiment: the current input into the switching power supply is controlled by the overcurrent protection circuit.
The switching power supply of the embodiment further comprises an overvoltage protection circuit; based on this, the method of this embodiment further includes: the voltage of the switching power supply is controlled by the overvoltage protection circuit.
By the embodiment, after the main power supply is powered off, the bus capacitor of the switch power supply can be quickly isolated, and the electric energy stored by the bus capacitor can be independently discharged; therefore, the phenomena of control circuit disorder, misoperation and the like caused by the power supply of the bus capacitor after the power failure of the main power supply are prevented. And after the power is cut off, the bus capacitor is blocked timely to provide power for subsequent circuits, and the service life of the mainboard is prolonged.
The above description is only a preferred embodiment 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 principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369141.XA CN111030437A (en) | 2019-12-26 | 2019-12-26 | Switching power supply and discharge method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369141.XA CN111030437A (en) | 2019-12-26 | 2019-12-26 | Switching power supply and discharge method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111030437A true CN111030437A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911369141.XA Pending CN111030437A (en) | 2019-12-26 | 2019-12-26 | Switching power supply and discharge method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055346A (en) * | 2009-11-09 | 2011-05-11 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN202712831U (en) * | 2012-06-19 | 2013-01-30 | 深圳市英威腾电气股份有限公司 | Electric discharge protection circuit of explosion-proof electric equipment and interlocking device thereof |
| CN203674754U (en) * | 2013-12-19 | 2014-06-25 | 浙江中自机电控制技术有限公司 | Bus capacitor discharging device |
| CN104578031A (en) * | 2014-12-23 | 2015-04-29 | 珠海格力电器股份有限公司 | Control circuit and air conditioning unit |
| CN104868708A (en) * | 2015-06-05 | 2015-08-26 | 卢雪明 | Power-on buffering and bus discharge circuit for frequency converter |
| CN105720854A (en) * | 2014-12-05 | 2016-06-29 | 叶芹芳 | Switch power supply applicable to three-level inverter |
| CN105763078A (en) * | 2014-12-18 | 2016-07-13 | 台达电子工业股份有限公司 | Switching power supply and bus capacitor voltage control method for switching power supply |
| CN211046764U (en) * | 2019-12-26 | 2020-07-17 | 珠海格力电器股份有限公司 | Switching power supply |
-
2019
- 2019-12-26 CN CN201911369141.XA patent/CN111030437A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055346A (en) * | 2009-11-09 | 2011-05-11 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN202712831U (en) * | 2012-06-19 | 2013-01-30 | 深圳市英威腾电气股份有限公司 | Electric discharge protection circuit of explosion-proof electric equipment and interlocking device thereof |
| CN203674754U (en) * | 2013-12-19 | 2014-06-25 | 浙江中自机电控制技术有限公司 | Bus capacitor discharging device |
| CN105720854A (en) * | 2014-12-05 | 2016-06-29 | 叶芹芳 | Switch power supply applicable to three-level inverter |
| CN105763078A (en) * | 2014-12-18 | 2016-07-13 | 台达电子工业股份有限公司 | Switching power supply and bus capacitor voltage control method for switching power supply |
| CN104578031A (en) * | 2014-12-23 | 2015-04-29 | 珠海格力电器股份有限公司 | Control circuit and air conditioning unit |
| CN104868708A (en) * | 2015-06-05 | 2015-08-26 | 卢雪明 | Power-on buffering and bus discharge circuit for frequency converter |
| CN211046764U (en) * | 2019-12-26 | 2020-07-17 | 珠海格力电器股份有限公司 | Switching power supply |
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