CN104748288B - Soft start charging circuit and control method thereof - Google Patents
Soft start charging circuit and control method thereof Download PDFInfo
- Publication number
- CN104748288B CN104748288B CN201310739202.3A CN201310739202A CN104748288B CN 104748288 B CN104748288 B CN 104748288B CN 201310739202 A CN201310739202 A CN 201310739202A CN 104748288 B CN104748288 B CN 104748288B
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- relay
- contact
- soft start
- charging circuit
- inductance
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000853 adhesive Substances 0.000 claims description 17
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000003111 delayed effect Effects 0.000 claims description 5
- 238000013024 troubleshooting Methods 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 5
- 230000018199 S phase Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a soft start charging circuit which comprises a controller, a first relay, a second relay and a charging resistor. The first relay and the second relay are respectively electrically connected with the controller; the first relay comprises two contacts, namely a first contact and a second contact; the contact of the second relay is connected with the charging resistor in series and then connected with the first contact in parallel; and the contact of the second relay and the second contact are respectively connected in series at different input ends of the three-phase alternating current power supply. The invention also relates to a control method of the soft start charging circuit. According to the soft start charging circuit and the control method thereof, the two relays are respectively placed between any two phases of the input side of the three-phase alternating-current power supply, so that the operation is simple and convenient. And the primary surge current and the secondary surge current are effectively inhibited, and the impact damage of the surge current to a circuit device is avoided. Meanwhile, the service life of the relay is prolonged.
Description
Technical field
The present invention relates to charging circuit technical field, more particularly to a kind of soft start charging circuit and its control method.
Background technology
In convertible frequency air-conditioner commonly use start charging scheme be mainly by dc bus negative pole series resistance simultaneously simultaneously
Join relay to realize.But the resistance and inductance in charging circuit powered on moment, loop can only suppress surge current, and
It is difficult in the current reduction to rational scope.Busbar voltage can only charge to 500V or so simultaneously, due to voltage difference be present,
Relay adhesive moment can produce secondary surge current.After charging complete, relay is connected in major loop for a long time, contact be present
The problems such as adhesion, short life.And main circuit current is the direct current that harmonic wave enriches, it is desirable to from the high DC relay of reliability
Or contactor, and the cost of such devices is very high.
The content of the invention
In view of the present situation of prior art, it is an object of the invention to provide a kind of soft start charging circuit and its controlling party
Method so that the soft start charging circuit can suppress a surge current and secondary surge current in charging process, avoid
Surge current impacts damage to circuit components.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of soft start charging circuit, including controller；
Also include the first relay, the second relay and charging resistor, first relay and second relay
Electrically connected respectively with the controller；
First relay includes two contacts, respectively the first contact and the second contact；
The contact of second relay connected with the charging resistor after with first contact shunt；
The contact of second relay is connected on the different inputs of three-phase alternating-current supply from second contact respectively.
In one of the embodiments, the control terminal of first relay and the control terminal of second relay difference
Electrically connected with the controller.
In one of the embodiments, in addition to the first inductance, the second inductance and the 3rd inductance；
First inductance, second inductance and the 3rd inductance are connected on the defeated of the three-phase alternating-current supply respectively
Enter end.
In one of the embodiments, in addition to rectification module；
One end of first inductance connects the three-phase alternating-current supply, and the other end connection of first inductance is described whole
Flow module；
Electrically connected behind second inductance series connection, second contact with the rectification module, the 3rd inductance is gone here and there successively
Join second relay contact and the charging resistor after electrically connected with the rectification module.
In one of the embodiments, in addition to storage capacitor；
The storage capacitor is connected in parallel on the output end of the rectification module.
Present invention also offers a kind of control method of soft start charging circuit, for the soft start described in any of the above-described
Charging circuit, comprise the following steps：
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor；
S2, judge rectification module output end DC bus-bar voltage whether be more than controller predeterminated voltage；
S21, if so, then the first relay adhesive, disconnect the second relay after a period of time that is delayed；
S22, if it is not, then disconnecting the second relay.
In one of the embodiments, step is also included before step S1：
S0, judge whether controller breaks down；If so, then disconnect second relay；If it is not, then enter step
S1。
In one of the embodiments, also comprise the following steps after the step S22：
The number that S3, statistics second relay disconnect；
S4, judge whether the number that second relay disconnects is 1 time, if so, then entering step S0；If it is not, then enter
The trouble shooting of row soft start charging circuit.
The beneficial effects of the invention are as follows：
The soft start charging circuit and its control method of the present invention, by the way that two relays are individually positioned in into three-phase alternating current
Any the two of the input side of power supply are alternate, it is only necessary to which accessing single phase poaer supply can complete to control, simple to operate.And effectively
Inhibit a surge current and secondary surge current, avoid surge current impact failure to caused by circuit devcie.Together
When, relay is placed on to the input side of AC power, avoids relay series connection for a long time caused contact adhesion in circuit
Situation, extend the service life of relay.
Brief description of the drawings
Fig. 1 is the control block of the embodiment of soft start charging circuit one of the present invention；
Fig. 2 is the flow chart of the control method of the soft start charging circuit of the present invention.
Embodiment
In order that technical scheme is clearer, below in conjunction with accompanying drawing, to the soft start charging circuit of the present invention
And its control method is described in further detail.It should be appreciated that specific embodiment described herein is only explaining this hair
It is bright to be not intended to limit the present invention.
It is as shown in Figure 1 the control block of the embodiment of soft start charging circuit one of the invention.Soft start charging electricity
Road includes controller, the first relay K1, the second relay K2, charging resistor R, the first inductance L1, the second inductance L2, the 3rd electricity
Feel L3, storage capacitor C and rectification module.
Wherein, the first relay K1 is single-pole double-throw relay, including control terminal and two contacts, and two contacts difference
For the first contact and the second contact.Second relay K2 is single-pole single-throw(SPST relay, including control terminal and a contact, second after
The first contact shunt after electrical equipment K2 contact series charging resistor R with the first relay K1.Second relay K2 contact with
Different inputs of first relay K1 the second contact series in three-phase alternating-current supply.
In the present embodiment, the T in three-phase alternating-current supply is connected to after the second relay K2 contact series charging resistor R
The input of phase.First relay K1 the first contact shunt the second relay K2 after concatenation and charging resistor R both ends,
That is one end of the first contact is connected to the second relay K2 contact, the other end connection charging resistor R of the first contact.First after
Input of electrical equipment K1 the second contact series in the S-phase of AC power.And first relay K1 and the second relay K2 control
End processed is electrically connected with the controller respectively, and controller controls the first relay K1 and the second relay K2 adhesive or disconnection.
In other embodiments, three-phase alternating current can also be connected to after the second relay K2 contact series charging resistor R
The input of the R phases of power supply, the first relay K1 the second contact can be connected on the input of the S/T phases of three-phase alternating-current supply
End.The input of the S-phase of three-phase alternating-current supply can also be connected to after second relay K2 contact series charging resistor R, the
One relay K1 the second contact can be connected on the input of the R/T phases of three-phase alternating-current supply.
In the present embodiment, the first relay and the second relay are placed on to the input of three-phase alternating-current supply, relay
Pressure difference during device contact adhesion is typically in 220V, much smaller than recommendation 277V so that and the service life of relay extends 60%,
And circuit structure is simple, device is few, and the reliability of the soft start charging circuit is also improved.
As a kind of embodiment, it is intersecting that the first inductance L1, the second inductance L2 and the 3rd inductance L3 are connected on three respectively
Flow the input of power supply.In the present embodiment, the first inductance L1 is connected on the input of the R phases of three-phase alternating-current supply.Second electricity
Sense is connected on the input of three-phase alternating-current supply S-phase, and the 3rd inductance L3 is connected on the input of three-phase alternating-current supply T-phase.At it
In his embodiment, the first inductance L1, the second inductance L2 and the 3rd inductance L3 position can be exchanged.
Preferably, the first inductance L1 one end is connected to rectification module, and the other end connects the R phases of three-phase alternating-current supply.The
Rectification module is connected to behind the first relay K1 of two inductance L2 series connection the second contact, i.e. one end of the second contact is connected to rectification
Module, the other end of the second contact connect the second inductance.3rd inductance L3 is sequentially connected in series the second relay K2 contact and charging
It is connected to rectification module after resistance R, i.e. one end of charging resistor R is connected to rectification module, charging resistor R other end connection the
Two relay K2 contact.
Preferably, storage capacitor C is connected in parallel on the output end of rectification module.In other embodiments, storage capacitor C quantity
Can be multiple.Multiple storage capacitors form energy capacitance set, and parallel with one another between multiple storage capacitors.
The course of work of the soft start charging circuit of the present invention is as follows：
After upper electricity, controller controls the second relay K2 adhesives, and the R phases and T-phase of three-phase alternating-current supply pass through charging resistor
R, the 3rd inductance L3 and the first inductance L1 charges to storage capacitor C.After the power-up can be relative by the R in three-phase alternating-current supply
Storage capacitor is charged, and completes control process, simple to operate.Meanwhile it effectively prevent for the second relay adhesive moment
Surge current generation, the effect of protection is served to the component in circuit.
When controller detects that the DC bus-bar voltage of the output end of rectification module reaches the predeterminated voltage of controller, control
Device processed controls the first relay K1 adhesives.Now, the second relay K2 contact and charging resistor R are bypassed, controller control
Second relay K2 disconnects.So, three-phase alternating-current supply is charged by the first relay K1 directly to storage capacitor C, controller
Start normal work, complete whole soft start-up process.This avoid the generation of the secondary surge current of relay adhesive moment,
So as to serve the effect of the component in protection circuit.
The control method for additionally providing a kind of soft start charging circuit based on same inventive concept of the present invention, for
The soft start charging circuit stated, as shown in Fig. 2 comprising the following steps：
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor；
S2, judge rectification module output end DC bus-bar voltage whether be more than controller predeterminated voltage；
S21, if so, then the first relay adhesive, disconnect the second relay after a period of time that is delayed；
S22, if it is not, then disconnecting the second relay.
More preferably, step is also included before step S1：
S0, judge whether controller breaks down；If so, then disconnect the second relay；If it is not, then enter step S1.
More preferably, also comprise the following steps after step S22：
The number that S3, the second relay of statistics disconnect；
S4, judge whether the number that the second relay disconnects is 1 time, if so, then entering step S0；If it is not, then carry out soft
Start the trouble shooting of charging circuit.
After electricity on controller, detect whether controller itself breaks down first.If controller itself fail,
Keep the off-state of the second relay, controller report failure.If controller normal work, after waiting 2s, controller control
Second relay adhesive.After second relay adhesive, three-phase alternating-current supply passes through charging resistor, the first inductance and the 3rd inductance pair
Storage capacitor is charged.Whether the DC bus-bar voltage Vdc of the output end of controller detection rectification module reaches after delay 3s
The predeterminated voltage Vo of controller, if so, i.e. Vdc ＞ Vo, then the first relay adhesive of controller control, is then delayed after 2s, control
Device processed controls the second relay to disconnect.So, three-phase alternating-current supply is entered by the first relay and three inductance to storage capacitor
Row charging, completes whole soft start-up process.
If the DC bus-bar voltage Vdc of rectification module is not up to the predeterminated voltage Vo of controller, i.e. Vdc ＜ Vo, then control
Device controls the second relay to disconnect.Meanwhile the number that controller disconnects to the second relay counts.Then, controller is sentenced
Whether the number that disconnected second relay disconnects is 1 time.When the number that the second relay disconnects is 1 time, continue to detect controller
Itself whether there is failure.When the number that the second relay disconnects is more than 1 time, then illustrates that charge circuit has failure, carry out
The trouble shooting of soft start charging circuit.
The soft start charging circuit and its control method of the present invention, by the way that two relays are individually positioned in into three-phase alternating current
Any the two of the input side of power supply are alternate, it is only necessary to which accessing single phase poaer supply can complete to control, simple to operate.And effectively
Inhibit a surge current and secondary surge current, avoid surge current impact failure to caused by circuit devcie.Together
When, relay is placed on to the input side of AC power, avoids relay series connection for a long time caused contact adhesion in circuit
Situation, extend the service life of relay.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of soft start charging circuit, including controller, it is characterised in that：
Also include the first relay, the second relay and charging resistor, first relay and second relay difference
Electrically connected with the controller；
First relay includes two contacts, respectively the first contact and the second contact；
The contact of second relay connected with the charging resistor after with first contact shunt；
The contact of second relay is connected on the different inputs of three-phase alternating-current supply from second contact respectively；
The controller controls the second relay adhesive first, when the controller detects that DC bus-bar voltage reaches control
During the predeterminated voltage of device processed, controller controls the first relay adhesive, disconnects second relay after a period of time that is delayed
Device.
2. soft start charging circuit according to claim 1, it is characterised in that：
The control terminal of first relay and the control terminal of second relay electrically connect with the controller respectively.
3. soft start charging circuit according to claim 2, it is characterised in that：
Also include the first inductance, the second inductance and the 3rd inductance；
First inductance, second inductance and the 3rd inductance are connected on the input of the three-phase alternating-current supply respectively
End.
4. soft start charging circuit according to claim 3, it is characterised in that：
Also include rectification module；
One end of first inductance connects the three-phase alternating-current supply, and the other end of first inductance connects the rectification mould
Block；
Electrically connected behind second inductance series connection, second contact with the rectification module, the 3rd inductance is sequentially connected in series institute
State the second relay contact and the charging resistor after electrically connected with the rectification module.
5. soft start charging circuit according to claim 4, it is characterised in that：
Also include storage capacitor；
The storage capacitor is connected in parallel on the output end of the rectification module.
6. a kind of control method of soft start charging circuit, for the soft start charging circuit described in claim any one of 1-5,
It is characterised in that it includes following steps：
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor；
S2, judge rectification module output end DC bus-bar voltage whether be more than controller predeterminated voltage；
S21, if so, then the first relay adhesive, disconnect second relay after a period of time that is delayed；
S22, if it is not, then disconnecting the second relay.
7. the control method of soft start charging circuit according to claim 6, it is characterised in that also include before step S1
Step：
S0, judge whether the controller breaks down；If so, then disconnect second relay；If it is not, then enter step
S1。
8. the control method of soft start charging circuit according to claim 6, it is characterised in that after the step S22
Also comprise the following steps：
The number that S3, statistics second relay disconnect；
S4, judge whether the number that second relay disconnects is 1 time, if so, then entering step S0；If it is not, then carry out soft
Start the trouble shooting of charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310739202.3A CN104748288B (en) | 2013-12-26 | 2013-12-26 | Soft start charging circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310739202.3A CN104748288B (en) | 2013-12-26 | 2013-12-26 | Soft start charging circuit and control method thereof |
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| CN104748288A CN104748288A (en) | 2015-07-01 |
| CN104748288B true CN104748288B (en) | 2018-01-19 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485867B (en) * | 2015-12-18 | 2018-12-07 | 珠海格力电器股份有限公司 | Control method, device and circuit of air conditioner |
| CN106440278B (en) * | 2016-10-21 | 2019-02-26 | 珠海格力电器股份有限公司 | Air conditioner and electric heating protection method and device for air conditioner |
| CN108008281B (en) * | 2017-11-16 | 2020-10-09 | 易事特集团股份有限公司 | Fault detection method, system, computer device and storage medium |
| CN107919655B (en) * | 2017-12-13 | 2023-07-11 | 珠海格力电器股份有限公司 | Control circuit, control method and air conditioner |
| CN108447735B (en) * | 2018-05-10 | 2023-11-07 | 浙江英洛华新能源科技有限公司 | Capacitive load impact resistant double-path high-voltage control assembly and closing control method thereof |
| CN109245512B (en) * | 2018-10-16 | 2024-07-05 | 珠海格力电器股份有限公司 | Control method, system and device of high-power frequency converter and storage medium |
| CN109979782B (en) * | 2019-03-22 | 2021-02-05 | 广东美的制冷设备有限公司 | Operation control method and device, household appliance and computer readable storage medium |
| CN112556113B (en) * | 2020-11-30 | 2021-12-03 | 珠海格力电器股份有限公司 | Multi-module unit and control method and device thereof, storage medium and processor |
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| KR20060005449A (en) * | 2004-07-13 | 2006-01-18 | 엘에스산전 주식회사 | Tri-state inverter charge circuit using thermal sensor |
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