CN203368014U - Soft start protection device and compressor diagnosis protection device comprising same - Google Patents
Soft start protection device and compressor diagnosis protection device comprising same Download PDFInfo
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- CN203368014U CN203368014U CN 201320203806 CN201320203806U CN203368014U CN 203368014 U CN203368014 U CN 203368014U CN 201320203806 CN201320203806 CN 201320203806 CN 201320203806 U CN201320203806 U CN 201320203806U CN 203368014 U CN203368014 U CN 203368014U
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- load
- soft start
- protective device
- triode thyristor
- bidirectional triode
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Abstract
The utility model relates to a soft start protection device and a compressor diagnosis protection device comprising the same. The soft start protection device comprises a switching element connected with a load in series, a bidirectional silicon controlled rectifier connected to two ends of the switching element in parallel, a current detection unit connected with the load, a power supply voltage detection unit connected with a power supply, and a load voltage detection unit connected with the load. The soft start protection device further comprises a bidirectional silicon controlled rectifier control unit and a microprocessor, wherein the bidirectional silicon controlled rectifier control unit is connected with the current detection unit, the power supply voltage detection unit and the load voltage detection unit, and the microprocessor is coupled to the bidirectional silicon controlled rectifier control unit. The soft start protection device provided by the utility model avoids impacts imposed on the load by surge current when a large load, such as a compressor motor, is started, thereby prolonging the service life of the load.
Description
Technical field
The utility model relates in general to technical field of electricity, and the compressor diagnostic protective device that relates to especially the soft start protective device and comprise this soft start protective device.
Background technology
The bulk loads equipment such as air-conditioning are in start-up course, its starting current is 5-8 times of rated current, this electric current is called surge current, the generation of surge current can cause light flash, the mechanical stress of equipment increases, and equipment is difficult to start the problems such as circuit breaker trip that reach on the residential quarter power transmission line strict at power reguirements.Therefore, generally understanding the design (calculated) load protective device is protected load equipment.
Normal load protective device such as contactor has been widely used in industry and domestic environments, and it is comprised of AC/DC coil and contact, is a kind of mechanical type electromagnetic equipment.But, its circuit complexity, useful life is short, maintainable poor.At present, according to the theory of intelligent grid, the increasing concern is concentrated on the protective circuit that can reach soft start.In order to meet energy demand, all low tension equipment need to reach low-power consumption, high efficiency requirement.Most of electric control modules of developing at present make every effort to realize the module intellectuality, its control subject is the AC/DC coil, and its objective is by various algorithms and extend the electrical endurance of contactor or by detecting the trouble diagnosibility that improves contactor such as other characteristics of arc length, duration.But, the existing electronic module based on hardware modifications, its system reliability and fail safe are lower, cause the useful life of this module shorter.
The utility model content
For the problem occurred in above prior art, the compressor diagnostic protective device that the utility model provides a kind of soft start protective device and comprises this soft start protective device is realized the soft start of bulk loads (as compressor).The utility model detects electric parameter by external module and carries out self diagnosis, and inside modules completes defencive function according to diagnostic result.Inside modules is carried out on-line monitoring to load, protection and control, and the excessive impact that load is caused of surge current while having avoided bulk loads (as compressor) to start, reliability, fail safe that the enhancing system is controlled, thus increased useful life of load.It is short useful life that intelligent control has solved module, at least one item in maintainable poor these problems.Related application also can be extended to the load of other suitable types, such as various single-phase inductance and ohmic load.
The utility model provides a kind of soft start protective device on the one hand; the soft start protective device comprises the switch element be connected in series with load; be connected in parallel on the bidirectional triode thyristor at switch element two ends and the current detecting unit be connected with load; the supply voltage detecting unit be connected with power supply, the load voltage detecting unit be connected with load.Current detecting unit is configured to detect the electric current of load, and relatively obtains the electric current difference according to actual current value and the reference current value of the load detected; The supply voltage detecting unit is configured to detect voltage over zero and the voltage phase signal of power supply; The load voltage detecting unit is configured to detect the voltage phase signal of load; The soft start protective device also comprises and current detecting unit, supply voltage detecting unit, and the bidirectional triode thyristor control unit that is connected of load voltage detecting unit, and the microprocessor be coupled with the bidirectional triode thyristor control unit.The bidirectional triode thyristor control unit is configured to obtain control signal according to the voltage phase signal of the voltage over zero of electric current difference, described power supply and voltage phase signal, load; Microprocessor is configured to by the trigger electrode of the closure of control signal control switch element, disconnection and control bidirectional triode thyristor.
Above-mentioned bidirectional triode thyristor control unit is configured to be arranged at the control unit on microprocessor or is configured to be independent of the digital signal processor of microprocessor.
The soft start protective device also comprises the series circuit of absorption resistance and electric capacity, the absorption resistance that this series circuit is in parallel with switch element and bidirectional triode thyristor and electric capacity.
Above-mentioned load is compressor electric motor, and switch element is the first relay switch, bidirectional triode thyristor be connected on the main winding of compressor electric motor after the first relay switch is in parallel; The soft start protective device also comprises the second relay switch, start-up capacitance and operation electric capacity, and the second relay switch is connected with start-up capacitance, then with move after Capacitance parallel connection the auxiliary winding that is series at compressor electric motor.
Above-mentioned load voltage detecting unit is connected in parallel on the two ends of operation electric capacity.
Above-mentioned soft start protective device also comprises relay drive circuit and bidirectional triode thyristor drive circuit; wherein; microprocessor is configured to by the closure of relay drive circuit control switch element, disconnection, controls the trigger electrode of bidirectional triode thyristor by the bidirectional triode thyristor drive circuit.
Above-mentioned soft start protective device also comprises the bidirectional triode thyristor voltage detection unit, and it is configured to detect the voltage at bidirectional triode thyristor two ends.
Above-mentioned current detecting unit comprises shunt resistance, thereby is provided with the voltage detecting circuit that obtains the electric current of load by detecting shunt resistance voltage at the shunt resistance two ends.
Soft start protective device in the utility model embodiment is built-in with predetermined algorithm, by this algorithm, load is carried out to on-line monitoring, and protection and control have realized the modularized electronic of controlling, and make load can realize intelligent soft start.
On the other hand, the utility model also provides a kind of compressor diagnostic protective device, and described compressor diagnostic protective device comprises soft start protective device described above, and wherein said load is compressor electric motor.The compressor diagnostic protective device has been realized the modularized electronic of controlling, and avoids compressor electric motor to produce at least one malfunction in overcurrent condition, under-voltage condition, welding on off state, cut-off switch state and mis-wired state.
The accompanying drawing explanation
Fig. 1 is the basic circuit diagram of a kind of soft start protective device of providing of one of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the technical solution of the utility model is described further.
Embodiment 1
The utility model provides a kind of specific embodiment of soft start protective device; as Fig. 1; soft start protective device 1 comprises the switch element 103 be connected in series with load 101; be connected in parallel on the bidirectional triode thyristor 104 at switch element 103 two ends and the current detecting unit 105 be connected with load 101; the supply voltage detecting unit 106 be connected with power supply 102, the load voltage detecting unit 107 be connected with load 101.Current detecting unit 105 is configured to detect by the electric current of load 101, and relatively obtains the electric current difference according to actual current value and the reference current value of the load 101 detected; Supply voltage detecting unit 106 is configured to detect voltage over zero and the voltage phase signal of power supply; Load voltage detecting unit 107 is configured to detect the voltage phase signal of load; Soft start protective device 1 also comprises and current detecting unit 105, supply voltage detecting unit 106, and the bidirectional triode thyristor control unit 108 that is connected of load voltage detecting unit 107, and the microprocessor 109 be coupled with bidirectional triode thyristor control unit 108.Bidirectional triode thyristor control unit 108 is configured to obtain control signal according to the voltage phase signal of the voltage over zero of electric current difference, described power supply and voltage phase signal, load; Microprocessor 109 is configured to by the trigger electrode of the closure of control signal control switch element 103, disconnection and control bidirectional triode thyristor 104.
Alternatively, the digital signal processor that bidirectional triode thyristor control unit 108 is configured to be arranged at the control unit on microprocessor 109 or is configured to be independent of microprocessor 109.Although in figure, 1 is shown by bidirectional triode thyristor control unit 108 control unit be arranged on microprocessor 109, but it will be understood by those skilled in the art that bidirectional triode thyristor control unit 108 can suitably be configured to be independent of the digital signal processor of microprocessor 109.
Alternatively, soft start protective device 1 also comprises the absorption resistance 110 in parallel with switch element 103 and bidirectional triode thyristor 104 and Absorption Capacitance 111.Absorption resistance 110 and Absorption Capacitance 111 both can be one another in series as illustrated in fig. 1, also can be connected in parallel to each other.
Further, load 101 is compressor electric motor, and switch element 103 is the first relay switch, bidirectional triode thyristor 104 with to be connected on compressor electric motor 101(after the first relay switch 103 is in parallel be load) main winding on; Soft start protective device 1 also comprises that the second relay switch 112, start-up capacitance 113 and operation electric capacity 114, the second relay switches 112 connect with start-up capacitance 113, then with the auxiliary winding that moves electric capacity 114 and be series at after in parallel compressor electric motor 101.
Further, load voltage detecting unit 107 is connected in parallel on the two ends of operation electric capacity 114.
Further; soft start protective device 1 also comprises relay drive circuit 115 and bidirectional triode thyristor drive circuit 116; wherein; microprocessor 109 is configured to by closure, the disconnection of relay drive circuit 115 control switch elements 103 (i.e. the first relay switch), controls the trigger electrode of bidirectional triode thyristor 104 by bidirectional triode thyristor drive circuit 116.
Further, soft start protective device 1 also comprises bidirectional triode thyristor voltage detection unit 117, and it is configured to detect the voltage at bidirectional triode thyristor 104 two ends.Contacts status that can identification switch element 103 by the data that detect, thus whether 103 work of monitoring switch element are normal.
Further, current detecting unit 105 comprises shunt resistance 1051, thereby is provided with the voltage detecting circuit that obtains the electric current of load 101 by detecting shunt resistance 1051 voltages at the shunt resistance two ends.
In the load start-up course, as shown in Figure 1, switch element 103 is in off-state, at first closed bidirectional triode thyristor 104, closure due to bidirectional triode thyristor 104, the voltage of the both sides, contact of switch element 103 is clamped to the conduction voltage drop of diode, the inhibition of electric arc while being conducive to the closing of contact of switch element 103, microprocessor 109 is controlled the trigger electrode of bidirectional triode thyristor 104, make the voltage that is added in load 101 two ends increase to gradually rated voltage, after arriving rated voltage, soft start completes, first Closing Switch element 103, then disconnect bidirectional triode thyristor 104.When switch element 103 contacts disconnect, can make bidirectional triode thyristor 104 closures, when the contact of switch element 103 disconnects fully, then disconnect bidirectional triode thyristor 104, make like this electrical potential difference minimum of both sides, contact, the arc extinguishing while also realizing disconnecting.Thereby realize soft start and, to effective protection of contact, a parallel-connection structure has two kinds of functions.
Embodiment 2
Embodiment of the present utility model also provides a kind of compressor diagnostic protective device of soft start protective device as shown in Figure 1 that comprises; Described soft start protective device 1 comprises the switch element 103 be connected in series with compressor electric motor 101 as load; be connected in parallel on the bidirectional triode thyristor 104 at switch element 103 two ends and the current detecting unit 105 be connected with compressor electric motor 101; the supply voltage detecting unit 106 be connected with power supply 102, the load voltage detecting unit 107 be connected with compressor electric motor 101.Current detecting unit 105 is configured to detect by the electric current of compressor electric motor 101, and relatively obtains the electric current difference according to actual current value and the reference current value of the compressor electric motor 101 detected; Supply voltage detecting unit 106 is configured to detect voltage over zero and the voltage phase signal of power supply; Load voltage detecting unit 107 is configured to detect the voltage phase signal of load; Soft start protective device 1 also comprises and current detecting unit 105, supply voltage detecting unit 106, and the bidirectional triode thyristor control unit 108 that is connected of load voltage detecting unit 107, and the microprocessor 109 be coupled with bidirectional triode thyristor control unit 108.Bidirectional triode thyristor control unit 108 is configured to obtain control signal according to the voltage phase signal of the voltage over zero of electric current difference, described power supply and voltage phase signal, load; Microprocessor 109 is configured to by the trigger electrode of the closure of control signal control switch element 103, disconnection and control bidirectional triode thyristor 104.
Alternatively, the digital signal processor that bidirectional triode thyristor control unit 108 is configured to be arranged at the control unit on microprocessor 109 or is configured to be independent of microprocessor 109.
Alternatively, soft start protective device 1 also comprises the absorption resistance 110 in parallel with switch element 103 and bidirectional triode thyristor 104 and Absorption Capacitance 111.Absorption resistance 110 and Absorption Capacitance 111 both can be one another in series as illustrated in fig. 1, also can be connected in parallel to each other.
Further, switch element 103 is the first relay switch, bidirectional triode thyristor 104 be connected on the main winding of compressor electric motor 101 after the first relay switch 103 is in parallel; Soft start protective device 1 also comprises that the second relay switch 112, start-up capacitance 113 and operation electric capacity 114, the second relay switches 112 connect with start-up capacitance 113, then with the auxiliary winding that moves electric capacity 114 and be series at after in parallel compressor electric motor 101.
Further, load voltage detecting unit 107 is connected in parallel on the two ends of operation electric capacity 114.
Further; soft start protective device 1 also comprises relay drive circuit 115 and bidirectional triode thyristor drive circuit 116; wherein; microprocessor 109 is configured to by closure, the disconnection of relay drive circuit 115 control switch elements 103 (i.e. the first relay switch), controls the trigger electrode of bidirectional triode thyristor 104 by bidirectional triode thyristor drive circuit 116.
Further, soft start protective device 1 also comprises bidirectional triode thyristor voltage detection unit 117, and it is configured to detect the voltage at bidirectional triode thyristor 104 two ends.Contacts status that can identification switch element 103 by the data that detect, thus whether 103 work of monitoring switch element are normal.
Further, current detecting unit 105 comprises shunt resistance 1051, thereby is provided with the voltage detecting circuit that obtains the electric current of load 101 by detecting shunt resistance 1051 voltages at the shunt resistance two ends.
In the load start-up course, as shown in Figure 1, switch element 103 is in off-state, at first closed bidirectional triode thyristor 104, closure due to bidirectional triode thyristor 104, the voltage of the both sides, contact of switch element 103 is clamped to the conduction voltage drop of diode, the inhibition of electric arc while being conducive to the closing of contact of switch element 103, microprocessor 109 is controlled the trigger electrode of bidirectional triode thyristor 104, make the voltage that is added in compressor electric motor 101 two ends increase to gradually rated voltage, after arriving rated voltage, soft start completes, first Closing Switch element 103, then disconnect bidirectional triode thyristor 104.When switch element 103 contacts disconnect, can make bidirectional triode thyristor 104 closures, when the contact of switch element 103 disconnects fully, then disconnect bidirectional triode thyristor 104, make like this electrical potential difference minimum of both sides, contact, the arc extinguishing while also realizing disconnecting.Thereby realize soft start and, to effective protection of contact, a parallel-connection structure has two kinds of functions.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the equipment that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All any modifications of doing, be equal to replacement, improvement etc. within spirit of the present utility model and principle, all be included in protection range of the present utility model.
Claims (10)
1. a soft start protective device, comprise the switch element be connected in series with load, and the bidirectional triode thyristor that is connected in parallel on described switch element two ends, it is characterized in that, described soft start protective device also comprises:
The current detecting unit be connected with load, this current detecting unit is configured to detect the electric current of described load, and relatively obtains the electric current difference according to actual current value and the reference current value of the load detected;
The supply voltage detecting unit be connected with power supply, this supply voltage detecting unit is configured to detect voltage over zero and the voltage phase signal of described power supply;
The load voltage detecting unit be connected with load, this load voltage detecting unit is configured to detect the voltage phase signal of described load;
With described current detecting unit, supply voltage detecting unit, and the bidirectional triode thyristor control unit that is connected of load voltage detecting unit, this bidirectional triode thyristor control unit is configured to the voltage phase signal acquisition control signal according to the voltage over zero of described electric current difference, described power supply and voltage phase signal, described load;
With the microprocessor of described bidirectional triode thyristor control unit coupling, this microprocessor is configured to control closure, the disconnection of described switch element and control the trigger electrode of described bidirectional triode thyristor by described control signal.
2. soft start protective device according to claim 1, is characterized in that, the digital signal processor that described bidirectional triode thyristor control unit is configured to be arranged at the control unit on described microprocessor or is configured to be independent of described microprocessor.
3. soft start protective device according to claim 2, is characterized in that, this soft start protective device also comprises the series circuit of absorption resistance and electric capacity, and this series circuit is in parallel with described switch element and bidirectional triode thyristor.
4. according to the described soft start protective device of claim 2 or 3, it is characterized in that, described load is compressor electric motor, and described switch element is the first relay switch, described bidirectional triode thyristor be connected on the main winding of compressor electric motor after described the first relay switch is in parallel; Described soft start protective device also comprises the second relay switch, start-up capacitance and operation electric capacity, and described the second relay switch is connected with described start-up capacitance, then with described operation Capacitance parallel connection after be series at the auxiliary winding of compressor electric motor.
5. soft start protective device according to claim 4, is characterized in that, the load voltage detecting unit is connected in parallel on the two ends of described operation electric capacity.
6. soft start protective device according to claim 5; it is characterized in that; described soft start protective device also comprises relay drive circuit and bidirectional triode thyristor drive circuit; wherein; described microprocessor is configured to control by relay drive circuit closure, the disconnection of described switch element, controls the trigger electrode of described bidirectional triode thyristor by the bidirectional triode thyristor drive circuit.
7. soft start protective device according to claim 6, is characterized in that, described soft start protective device also comprises the bidirectional triode thyristor voltage detection unit, and it is configured to detect the voltage at described bidirectional triode thyristor two ends.
8. soft start protective device according to claim 1, is characterized in that, described current detecting unit comprises shunt resistance, thereby be provided with the voltage detecting circuit that obtains the electric current of described load by detecting shunt resistance voltage at described shunt resistance two ends.
9. soft start protective device according to claim 7, is characterized in that, described current detecting unit comprises shunt resistance, thereby be provided with the voltage detecting circuit that obtains the electric current of described load by detecting shunt resistance voltage at described shunt resistance two ends.
10. a compressor diagnostic protective device; it is characterized in that; comprise the described soft start protective device of any one in claim 1-9; wherein said load is compressor electric motor; described microprocessor also is configured to drive described switch element disconnection, closure, to avoid described compressor electric motor, produces at least one malfunction in overcurrent condition, under-voltage condition, welding on off state, cut-off switch state and mis-wired state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203806 CN203368014U (en) | 2013-04-19 | 2013-04-19 | Soft start protection device and compressor diagnosis protection device comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203806 CN203368014U (en) | 2013-04-19 | 2013-04-19 | Soft start protection device and compressor diagnosis protection device comprising same |
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| CN203368014U true CN203368014U (en) | 2013-12-25 |
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| CN 201320203806 Expired - Lifetime CN203368014U (en) | 2013-04-19 | 2013-04-19 | Soft start protection device and compressor diagnosis protection device comprising same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322773A (en) * | 2014-06-18 | 2016-02-10 | 台达电子工业股份有限公司 | Slow start circuit and operation method thereof |
| CN106253263A (en) * | 2015-06-05 | 2016-12-21 | 通用电气公司 | DC distribution and protection system |
| CN108923388A (en) * | 2018-08-17 | 2018-11-30 | 东菱技术有限公司 | A kind of fault detection circuit powering on buffer cell and method |
-
2013
- 2013-04-19 CN CN 201320203806 patent/CN203368014U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322773A (en) * | 2014-06-18 | 2016-02-10 | 台达电子工业股份有限公司 | Slow start circuit and operation method thereof |
| CN105322773B (en) * | 2014-06-18 | 2018-02-09 | 台达电子工业股份有限公司 | Soft-start circuit and its operating method |
| CN106253263A (en) * | 2015-06-05 | 2016-12-21 | 通用电气公司 | DC distribution and protection system |
| CN108923388A (en) * | 2018-08-17 | 2018-11-30 | 东菱技术有限公司 | A kind of fault detection circuit powering on buffer cell and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |