CN104748288A - Soft start charging circuit and control method thereof - Google Patents
Soft start charging circuit and control method thereof Download PDFInfo
- Publication number
- CN104748288A CN104748288A CN201310739202.3A CN201310739202A CN104748288A CN 104748288 A CN104748288 A CN 104748288A CN 201310739202 A CN201310739202 A CN 201310739202A CN 104748288 A CN104748288 A CN 104748288A
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- relay
- contact
- soft start
- charging circuit
- inductance
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Classifications
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- 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, wherein both the first relay and the second relay are electrically connected with the controller; the first relay comprises two contacts namely the first contact and the second contact; the contact of the second relay is connected in series with the charging resistor and then connected in parallel with the first contact; and the contact of the second relay and the second contact are respectively connected in series with different input ends of a three-phase alternating current power supply. The invention further 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 operation is simple and convenient. A primary surge current and a secondary surge current are effectively inhibited, and the impact damage of the surge currents to circuit devices is avoided. Meanwhile, the service lives of the relays are prolonged.
Description
Technical field
The present invention relates to charging circuit technical field, particularly relate to a kind of soft start charging circuit and control method thereof.
Background technology
Startup charging scheme conventional in convertible frequency air-conditioner mainly by the negative pole series resistance at dc bus simultaneously relay in parallel realize.But at charging circuit powered on moment, the resistance in loop and inductance can only surge current suppressions, and are difficult to this electric current to be reduced in rational scope.Busbar voltage can only charge to about 500V simultaneously, and owing to there is voltage difference, relay adhesive can produce secondary surge current instantaneously.After charging complete, relay is connected in major loop for a long time, there is the problems such as contact adhesion, life-span be short.And main circuit current is the direct current that harmonic wave enriches, the DC relay that requirement selects reliability high or contactor, and the cost of such devices is very high.
Summary of the invention
In view of the present situation of prior art, the object of the present invention is to provide a kind of soft start charging circuit and control method thereof, make this soft start charging circuit can suppress a surge current in charging process and secondary surge current, avoid surge current and damage is impacted to circuit components.
For achieving the above object, the present invention adopts following technical scheme:
A kind of soft start charging circuit, comprises controller;
Also comprise the first relay, the second relay and charging resistor, described first relay and described second relay are electrically connected with described controller respectively;
Described first relay comprises two contacts, is respectively the first contact and the second contact;
Connect with described charging resistor afterwards and described first contact shunt in the contact of described second relay;
Contact and described second contact of described second relay are connected on the different inputs of three-phase alternating-current supply respectively.
Wherein in an embodiment, the control end of described first relay and the control end of described second relay are electrically connected with described controller respectively.
Wherein in an embodiment, also comprise the first inductance, the second inductance and the 3rd inductance;
Described first inductance, described second inductance and described 3rd inductance are connected on the input of described three-phase alternating-current supply respectively.
Wherein in an embodiment, also comprise rectification module;
One end of described first inductance connects described three-phase alternating-current supply, and the other end of described first inductance connects described rectification module;
Be electrically connected with described rectification module behind described second described second contact of inductance series connection, described 3rd inductance is connected successively after the contact of described second relay and described charging resistor and is electrically connected with described rectification module.
Wherein in an embodiment, also comprise storage capacitor;
Described storage capacitor is connected in parallel on the output of described rectification module.
Present invention also offers a kind of control method of soft start charging circuit, for the soft start charging circuit described in above-mentioned any one, comprise the steps:
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor;
S2, judge whether the DC bus-bar voltage of the output of rectification module is greater than the predeterminated voltage of controller;
S21, if so, then the first relay adhesive, disconnect the second relay after time delay a period of time;
S22, if not, then disconnect the second relay.
Wherein in an embodiment, before step S1, also comprise step:
S0, judge whether controller breaks down; If so, described second relay is then disconnected; If not, then step S1 is entered.
Wherein in an embodiment, also comprise the steps: after described step S22
S3, add up described second relay disconnect number of times;
S4, judge described second relay disconnect number of times whether be 1 time, if so, then enter step S0; If not, then the trouble shooting of soft start charging circuit is carried out.
The invention has the beneficial effects as follows:
Soft start charging circuit of the present invention and control method thereof, by two relays being placed on respectively any two alternate of the input side of three-phase alternating-current supply, only need access single phase poaer supply to complete control, simple to operation.And effectively inhibit a surge current and secondary surge current, avoid the impact failure that surge current causes circuit devcie.Meanwhile, relay is placed on the input side of AC power, avoids relay and to connect for a long time the situation of the contact adhesion produced in circuit, extend the service life of relay.
Accompanying drawing explanation
Fig. 1 is the controlling party block diagram of soft start charging circuit one embodiment of the present invention;
Fig. 2 is the flow chart of the control method of soft start charging circuit of the present invention.
Detailed description of the invention
In order to make technical scheme of the present invention clearly, below in conjunction with accompanying drawing, soft start charging circuit of the present invention and control method thereof are described in further detail.Should be appreciated that specific embodiment described herein only in order to explain that the present invention is not intended to limit the present invention.
Be illustrated in figure 1 the controlling party block diagram of soft start charging circuit one embodiment of the present invention.This soft start charging circuit comprises controller, the first relay K 1, second relay K 2, charging resistor R, the first inductance L 1, second inductance L 2, the 3rd inductance L 3, storage capacitor C and rectification module.
Wherein, the first relay K 1 is single-pole double-throw relay, comprises control end and two contacts, and two contacts are respectively the first contact and the second contact.Second relay K 2 is single-pole single-throw(SPST relay, comprises control end and a contact, with the first contact shunt of the first relay K 1 after the contact series charging resistor R of the second relay K 2.The contact of the second relay K 2 and the different inputs of the second contact series of the first relay K 1 at three-phase alternating-current supply.
In the present embodiment, the input of the T-phase at three-phase alternating-current supply is connected to after the contact series charging resistor R of the second relay K 2.First contact shunt, second relay K 2 after concatenation of the first relay K 1 and the two ends of charging resistor R, namely one end of the first contact is connected to the contact of the second relay K 2, and the other end of the first contact connects charging resistor R.Second contact series of the first relay K 1 is at the input of the S-phase of AC power.And the control end of the first relay K 1 and the second relay K 2 is electrically connected with controller respectively, controller controls adhesive or the disconnection of the first relay K 1 and the second relay K 2.
In other embodiments, also can be connected to the input of the R phase of three-phase alternating-current supply after the contact series charging resistor R of the second relay K 2, the second contact of the first relay K 1 can be connected on the input of the S/T phase of three-phase alternating-current supply.Also can be connected to the input of the S-phase of three-phase alternating-current supply after the contact series charging resistor R of the second relay K 2, the second contact of the first relay K 1 can be connected on the input of the R/T phase of three-phase alternating-current supply.
In the present embodiment, first relay and the second relay are placed on the input of three-phase alternating-current supply, pressure reduction during relay contact adhesion is generally at 220V, much smaller than recommendation 277V, make extend 60% the service life of relay, and circuit structure is simple, device is few, and the reliability of this soft start charging circuit have also been obtained raising.
As a kind of embodiment, the first inductance L 1, second inductance L 2 and the 3rd inductance L 3 are connected on the input of three-phase alternating-current supply respectively.In the present embodiment, the first inductance L 1 is connected on the input of the R phase of three-phase alternating-current supply.Second inductance is connected on the input of three-phase alternating-current supply S-phase, and the 3rd inductance L 3 is connected on the input of three-phase alternating-current supply T-phase.In other embodiments, the position of the first inductance L 1, second inductance L 2 and the 3rd inductance L 3 can be exchanged.
Preferably, one end of the first inductance L 1 is connected to rectification module, and the other end connects the R phase of three-phase alternating-current supply.Second inductance L 2 connect the first relay K 1 the second contact after be connected to rectification module, namely one end of the second contact is connected to rectification module, and the other end of the second contact connects the second inductance.3rd inductance L 3 is connected successively after the contact of the second relay K 2 and charging resistor R and is connected to rectification module, and namely one end of charging resistor R is connected to rectification module, and the other end of charging resistor R connects the contact of the second relay K 2.
Preferably, storage capacitor C is connected in parallel on the output of rectification module.In other embodiments, the quantity of storage capacitor C can be multiple.Multiple storage capacitor forms energy capacitance set, and parallel with one another between multiple storage capacitor.
The course of work of soft start charging circuit of the present invention is as follows:
After powering on, controller controls the second relay K 2 adhesive, and the R phase of three-phase alternating-current supply and T-phase charge to storage capacitor C by charging resistor R, the 3rd inductance L 3 and the first inductance L 1.Namely charge by the R Stored energy electric capacity in three-phase alternating-current supply after the power-up, complete control procedure, simple to operation.Meanwhile, effectively prevent the generation of the surge current of the second relay adhesive moment, the components and parts in circuit are served to the effect of protection.
When controller detects that the DC bus-bar voltage of the output of rectification module reaches the predeterminated voltage of controller, controller controls the first relay K 1 adhesive.Now, contact and the charging resistor R of the second relay K 2 are bypassed, and controller controls the second relay K 2 and disconnects.Like this, three-phase alternating-current supply is charged directly to storage capacitor C by the first relay K 1, and controller starts normal work, completes whole soft start-up process.This avoid the generation of the secondary surge current of relay adhesive moment, thus serve the effect of the components and parts in protection circuit.
The control method additionally providing a kind of soft start charging circuit based on same inventive concept of the present invention, for above-mentioned soft start charging circuit, as shown in Figure 2, comprises the steps:
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor;
S2, judge whether the DC bus-bar voltage of the output of rectification module is greater than the predeterminated voltage of controller;
S21, if so, then the first relay adhesive, disconnect the second relay after time delay a period of time;
S22, if not, then disconnect the second relay.
More preferably, also step is comprised before step S1:
S0, judge whether controller breaks down; If so, the second relay is then disconnected; If not, then step S1 is entered.
More preferably, also comprise the steps: after step S22
S3, add up second relay disconnect number of times;
S4, judge second relay disconnect number of times whether be 1 time, if so, then enter step S0; If not, then the trouble shooting of soft start charging circuit is carried out.
After controller powers on, first whether detection control device self breaks down.If controller itself fail, then keep the off-state of the second relay, controller report fault.If controller normally works, then, after waiting for 2s, controller controls the second relay adhesive.After second relay adhesive, three-phase alternating-current supply is charged to storage capacitor by charging resistor, the first inductance and the 3rd inductance.After time delay 3s, whether the DC bus-bar voltage Vdc of the output of controller detection rectification module reaches the predeterminated voltage Vo of controller, if so, be Vdc > Vo, then controller controls the first relay adhesive, then, after time delay 2s, controller controls the second relay and disconnects.Like this, three-phase alternating-current supply is charged to storage capacitor by the first relay and three inductance, completes whole soft start-up process.
If the DC bus-bar voltage Vdc of rectification module does not reach the predeterminated voltage Vo of controller, i.e. Vdc < Vo, then controller controls the second relay disconnection.Meanwhile, controller is added up the number of times that the second relay disconnects.Then, controller judges whether the number of times that the second relay disconnects is 1 time.When the number of times that the second relay disconnects is 1 time, continues detection control device self and whether there is fault.When the number of times that the second relay disconnects is greater than 1 time, then illustrate that charge circuit exists fault, carries out the trouble shooting of soft start charging circuit.
Soft start charging circuit of the present invention and control method thereof, by two relays being placed on respectively any two alternate of the input side of three-phase alternating-current supply, only need access single phase poaer supply to complete control, simple to operation.And effectively inhibit a surge current and secondary surge current, avoid the impact failure that surge current causes circuit devcie.Meanwhile, relay is placed on the input side of AC power, avoids relay and to connect for a long time the situation of the contact adhesion produced in circuit, extend the service life of relay.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a soft start charging circuit, comprises controller, it is characterized in that:
Also comprise the first relay, the second relay and charging resistor, described first relay and described second relay are electrically connected with described controller respectively;
Described first relay comprises two contacts, is respectively the first contact and the second contact;
Connect with described charging resistor afterwards and described first contact shunt in the contact of described second relay;
Contact and described second contact of described second relay are connected on the different inputs of three-phase alternating-current supply respectively.
2. soft start charging circuit according to claim 1, is characterized in that:
The control end of described first relay and the control end of described second relay are electrically connected with described controller respectively.
3. soft start charging circuit according to claim 2, is characterized in that:
Also comprise the first inductance, the second inductance and the 3rd inductance;
Described first inductance, described second inductance and described 3rd inductance are connected on the input of described three-phase alternating-current supply respectively.
4. soft start charging circuit according to claim 3, is characterized in that:
Also comprise rectification module;
One end of described first inductance connects described three-phase alternating-current supply, and the other end of described first inductance connects described rectification module;
Be electrically connected with described rectification module behind described second described second contact of inductance series connection, described 3rd inductance is connected successively after the contact of described second relay and described charging resistor and is electrically connected with described rectification module.
5. soft start charging circuit according to claim 4, is characterized in that:
Also comprise storage capacitor;
Described storage capacitor is connected in parallel on the output of described rectification module.
6. a control method for soft start charging circuit, for the soft start charging circuit described in any one of claim 1-5, is characterized in that, comprise the steps:
S1, controller control the second relay adhesive, and three-phase alternating-current supply charges to storage capacitor;
S2, judge whether the DC bus-bar voltage of the output of rectification module is greater than the predeterminated voltage of controller;
S21, if so, then the first relay adhesive, disconnect described second relay after time delay a period of time;
S22, if not, then disconnect the second relay.
7. the control method of soft start charging circuit according to claim 6, is characterized in that, also comprise step before step S1:
S0, judge whether described controller breaks down; If so, described second relay is then disconnected; If not, then step S1 is entered.
8. the control method of soft start charging circuit according to claim 6, is characterized in that, also comprises the steps: after described step S22
S3, add up described second relay disconnect number of times;
S4, judge described second relay disconnect number of times whether be 1 time, if so, then enter step S0; If not, then the trouble shooting of soft start charging circuit is carried out.
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| CN201310739202.3A CN104748288B (en) | 2013-12-26 | 2013-12-26 | Soft start charging circuit and its control method |
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| CN201310739202.3A CN104748288B (en) | 2013-12-26 | 2013-12-26 | Soft start charging circuit and its control method |
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| CN105485867A (en) * | 2015-12-18 | 2016-04-13 | 珠海格力电器股份有限公司 | Control method and device for air conditioner and circuit |
| CN106440278A (en) * | 2016-10-21 | 2017-02-22 | 珠海格力电器股份有限公司 | Air conditioner and air conditioner electrical heating protection method and device |
| CN107919655A (en) * | 2017-12-13 | 2018-04-17 | 珠海格力电器股份有限公司 | Control circuit, control method and air-conditioning |
| CN108008281A (en) * | 2017-11-16 | 2018-05-08 | 易事特集团股份有限公司 | Fault detection method, system, computer equipment and storage medium |
| CN108447735A (en) * | 2018-05-10 | 2018-08-24 | 浙江英洛华新能源科技有限公司 | Anti- capacitive load impact two-way high voltage control component and its closure control method |
| CN109245512A (en) * | 2018-10-16 | 2019-01-18 | 珠海格力电器股份有限公司 | A kind of control method of big-power transducer, system, device and storage medium |
| CN109979782A (en) * | 2019-03-22 | 2019-07-05 | 广东美的制冷设备有限公司 | Progress control method, device, household appliance and computer readable storage medium |
| CN112556113A (en) * | 2020-11-30 | 2021-03-26 | 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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| CN109245512A (en) * | 2018-10-16 | 2019-01-18 | 珠海格力电器股份有限公司 | A kind of control method of big-power transducer, system, device and storage medium |
| CN109979782A (en) * | 2019-03-22 | 2019-07-05 | 广东美的制冷设备有限公司 | Progress control method, device, household appliance and computer readable storage medium |
| CN112556113A (en) * | 2020-11-30 | 2021-03-26 | 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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