CN201533275U - Device for regulating load voltage or current - Google Patents
Device for regulating load voltage or current Download PDFInfo
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- CN201533275U CN201533275U CN2009202555146U CN200920255514U CN201533275U CN 201533275 U CN201533275 U CN 201533275U CN 2009202555146 U CN2009202555146 U CN 2009202555146U CN 200920255514 U CN200920255514 U CN 200920255514U CN 201533275 U CN201533275 U CN 201533275U
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- transformer
- adjusting device
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- current
- load
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Abstract
The utility model discloses a device for regulating load voltage or current, which comprises an isolating transformer; the primary side of the transformer is provided with a first tap used for connecting load and a second tap used for connecting with the power supply; a controllable short circuit switch is arranged between the first tap and the second tap; the secondary side of the transformer is provided with a controllable impedance regulator; the device for regulating the load voltage or current also comprises a control system; the input end of the control system is connected with a load voltage or current detector; and the output end of the control system is respectively connected with the control input end of the controllable impedance regulator and the control end of the controllable short circuit switch. The device for regulating the load voltage or current has the effects that the secondary side voltage of the transformer is selected according to controllable silicon without serial connection or minimum cost of a filter; and the harmonic current flowing to the primary side of the transformer is greatly reduced, and the influence on the main loop is greatly reduced.
Description
Technical field
The device that the utility model relates to is that the SCR control transformer is sealed in the load loop, change the impedance of transformer primary side by changing the Circuit Fault on Secondary Transformer impedance, thereby reaching the purpose of the electric current and the voltage of change of load, specifically is a kind of adjusting device that adopts the load voltage or the electric current of SCR control transformer.
Background technology
The load of incoming transport electrical network often needs dynamically to change its electric current and voltage.For example, street lamp need carry out dynamic step-down to it when overtension, to improve street lamp useful life and to reach energy-saving effect; During electric motor starting, its starting current is bigger, will cause the instantaneous decline of line voltage,, need the starting current of motor be limited for this reason.
The general at present method that adopts is to seal in controllable silicon in load loop, by the change silicon controlled angle of flow, thus the electric current of change of load and voltage.But, do like this and can bring some problems in many occasions:
1, there are a large amount of harmonic currents in the load loop, and cause the line voltage distortion.Even install filter additional in the net side, do not eliminate the harmonic current of load loop yet, these harmonic currents are catastrophic to capacitive load.
2, when load voltage is higher, 10kV for example, then controllable silicon needs a plurality of series connection, and it triggers loop and need adopt light to trigger, and product cost is increased, and reliability is reduced.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides that a kind of control system is simple and reliable, cost is low, can carry out harmonic and the impedance of quick adjustment series transformer on the spot, really realizes regulating continuously load current and voltage.
For realizing described target, the technical solution of the utility model is as follows:
The adjusting device of a kind of load voltage or electric current comprises isolating transformer, is provided with first tap and second tap that is used to be connected power supply that is used to connect load at the primary side of transformer, is provided with controlled short switch between first and second taps; Be provided with the controllable impedance adjusting device at secondary side; Also comprise control system, the input of control system connects loaded voltage or current sensing means, and the output of control system connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch respectively.
Described controllable impedance adjusting device is a controllable silicon, and controllable silicon is connected in the secondary side loop.
Described control system is to be the control core circuit with the controller; The output of described voltage or current sensing means connects the signal input part of controller after the A/D conversion;
The output of described control connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch by drive circuit respectively.
Described controlled short switch is contactor or circuit breaker.
Described voltage or current sensing means are the voltage transformer at load two ends or the current transformer of load loop, and voltage (or electric current) signal of voltage transformer (or current transformer) is the output of voltage or current sensing means after treatment.
In the secondary side loop, can also install filter.
Described filter is the filter circuit that is barricaded as by filtering capacitor and filter reactor.
The three-phase of the corresponding isolating transformer of described controlled short switch is located at respectively between first and second taps of the every phase of transformer.
Described filter circuit has 1～4, is connected in parallel on the two ends of controllable impedance adjusting device respectively.
The principle of this device is, the primary side series connection of isolating transformer inserts in the major loop of load, secondary side installing thyristor installation at transformer, by changing the silicon controlled trigger angle, to change the secondary side impedance of transformer, thereby change the primary side impedance, thereby change the electric current of major loop and the voltage at load two ends.In the occasion that need limit harmonic wave,,, the harmonic current that flows in the major loop is reduced greatly so that the harmonic current of Circuit Fault on Secondary Transformer absorbs on the spot at Circuit Fault on Secondary Transformer installing filter.
The utility model compared with prior art its advantageous effect is as follows:
A) because irrelevant at the voltage and the load voltage of isolating transformer secondary side, can select suitable voltage, make the controllable silicon of Circuit Fault on Secondary Transformer or the cost of filter reduce as far as possible, generally need not to connect or the cost minimum of filter is selected the secondary side voltage of transformer according to controllable silicon.
B) because filter is installed in Circuit Fault on Secondary Transformer, make harmonic current absorb on the spot, the harmonic current of inflow transformer primary side reduces greatly, will reduce greatly the influence of major loop.
Description of drawings
Fig. 1 is the principle schematic of this device.
Main wiring diagram when Fig. 2 is used for road lamp energy-saving for this device of example 1.
Main wiring diagram when Fig. 3 is used for the high-voltage motor starting for this device of example 2.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As Fig. 1, the adjusting device of a kind of load voltage or electric current comprises isolating transformer, is provided with first tap and second tap that is used to be connected power supply that is used to connect load at the primary side of transformer, is provided with controlled short switch K between first and second taps; Be provided with the controllable impedance adjusting device at secondary side; Also comprise the control control system, the input of control system connects loaded voltage or current sensing means, and the output of control system connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch respectively.
This routine controllable impedance adjusting device is a controllable silicon, and controllable silicon is connected in the secondary side loop.The primary side voltage of described isolating transformer can be higher than secondary side voltage, also can be lower than secondary side voltage.Described control system is to be the control core circuit with controller (this example adopts MCU, also can adopt PLC etc.); The output of described voltage or current sensing means connects the signal input part of controller after the A/D conversion; The output of described controller connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch by drive circuit respectively.Described controlled short switch is contactor or circuit breaker K, and the input circuit (coil) of contactor or circuit breaker K is controlled by the controller.
Described voltage or current sensing means are the voltage transformer at load two ends or the current transformer of load loop, and voltage (or electric current) signal of voltage transformer (or current transformer) is the output of voltage or current sensing means after treatment.
In this example, the circuit that the described A/D of being used for conversion and electric current and voltage are handled can be referred to as sample circuit, according to concrete needs, can also add functional circuits such as filtering.Described drive circuit can adopt amplifying circuits such as triode.
Also being provided with filter in the secondary side loop, specifically can be the filter circuit that is barricaded as by filtering capacitor and filter reactor, and such filter circuit is often seen in the prior art, has not just further limited.
As the example 1 of Fig. 2, this device is applied in the street lamp, and as the example 2 of Fig. 3, it is medium that this device is used for motor, and described controlled short switch is located between first and second taps of transformer; The secondary side loop of described transformer is that the secondary side of transformer adopts delta connection or star-star connection; Simultaneously, described controllable impedance adjusting device is provided with identical three-phase, is located at respectively between the three-phase of Circuit Fault on Secondary Transformer tap.
When being used for street lamp, filter circuit can also be set, described filter circuit has 1～4, is connected in parallel on the two ends of controllable impedance adjusting device respectively.
In the example 1, three K switch 2 among Fig. 2 are controlled short switch, also are provided with three K switch 1 at the input of power supply.
When street lamp starts, first K2 closure, closed again K1.
Higher when system voltage, when needing step-down, allow the full conducting of controllable silicon earlier, disconnect K2 again, closed again K3 after the time-delay slowly regulates thyristor operating angle more as required, with slow change street lamp voltage, till street lamp voltage reaches requirement.
Because transformer primary side voltage is lower in this device,, make the cost of filter lower, and the silicon controlled cost is not high yet so this transformer adopting step-up transformer improves secondary side voltage.In this example, be provided with a gate-controlled switch K3, select to use for the user by MCU control for filter circuit.
Control program among the MCU is to be easy to realize, so do not further specify at this for the technical staff in the prior art field.
In the example 2, the K switch 2 among Fig. 3 is controlled short switch, also is provided with K switch 1 at the input of power supply.
When electric motor starting, K2 disconnects, earlier closed K1.According to restriction current value adjustment silicon controlled trigger angle, change the impedance of transformer again, make the current value of motor circuit in allowed band, after motor starts fully, the K2 switch that closes again, this moment, the device bypass was to reduce loss.
Because transformer primary side voltage is higher in the native system, so this transformer adopting step-down transformer reduces secondary side voltage, make the cost of controllable silicon and triggering system thereof lower, because the electric motor starting time is very short, Circuit Fault on Secondary Transformer can not installed filter.
Claims (9)
1. the adjusting device of load voltage or electric current, it is characterized in that comprising isolating transformer, primary side at isolating transformer is provided with first tap and second tap that is used to be connected power supply that is used to connect load, is provided with controlled short switch between first and second taps; Be provided with the controllable impedance adjusting device at secondary side; Also comprise control system, the input of control system connects the checkout gear of loaded voltage or electric current, and the output of control system connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch respectively.
2. the adjusting device of load voltage according to claim 1 or electric current is characterized in that described control system is is the control core circuit with the controller; The output of described voltage or current sensing means connects the signal input part of controller after the A/D conversion;
The output of described controller connects the control input end of described controllable impedance adjusting device and the control end of controlled short switch by drive circuit respectively.
3. the adjusting device of load voltage according to claim 1 and 2 or electric current is characterized in that described controllable impedance adjusting device is a controllable silicon, and controllable silicon is connected in the secondary side loop of isolating transformer.
4. the adjusting device of load voltage according to claim 1 and 2 or electric current is characterized in that described controlled short switch is contactor or circuit breaker.
5. the adjusting device of load voltage according to claim 1 and 2 or electric current is characterized in that described voltage or current sensing means are instrument transformers; Described instrument transformer comprises current transformer and voltage transformer:
Current transformer is connected in load circuit, and the signal of current transformer is the current signal output of voltage or current sensing means after treatment;
Voltage transformer is connected in the load two ends, and the signal of voltage transformer is the voltage signal output of voltage or current sensing means after treatment.
6. the adjusting device of load voltage according to claim 1 or electric current is characterized in that also installing filter in the secondary side loop of isolating transformer.
7. the adjusting device of load voltage according to claim 6 or electric current is characterized in that described filter is the filter circuit that is barricaded as by filtering capacitor and filter reactor.
8. the adjusting device of load voltage according to claim 7 or electric current is characterized in that described filter circuit has 1～4, is connected in parallel on the two ends of controllable impedance adjusting device respectively.
9. the adjusting device of load voltage according to claim 1 or electric current is characterized in that the three-phase of the corresponding isolating transformer of described controlled short switch being located between first and second taps of the every phase of transformer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202555146U CN201533275U (en) | 2009-11-20 | 2009-11-20 | Device for regulating load voltage or current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202555146U CN201533275U (en) | 2009-11-20 | 2009-11-20 | Device for regulating load voltage or current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201533275U true CN201533275U (en) | 2010-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202555146U Expired - Fee Related CN201533275U (en) | 2009-11-20 | 2009-11-20 | Device for regulating load voltage or current |
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| Country | Link |
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| CN (1) | CN201533275U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873117A (en) * | 2012-10-10 | 2013-01-16 | 芜湖恒泰有色线材股份有限公司 | Method for manufacturing large-diameter high-frequency resistance welding copper wire manufacturing method |
| CN103676679A (en) * | 2012-09-07 | 2014-03-26 | 冯晓东 | Electrical switch system |
| CN105323899A (en) * | 2014-08-05 | 2016-02-10 | 宜昌普泰克电力科技有限公司 | Voltage-reducing energy-saving apparatus for gas lamp |
| CN106292827A (en) * | 2016-08-18 | 2017-01-04 | 华为技术有限公司 | A kind of device for generating voltage and semiconductor chip |
-
2009
- 2009-11-20 CN CN2009202555146U patent/CN201533275U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676679A (en) * | 2012-09-07 | 2014-03-26 | 冯晓东 | Electrical switch system |
| CN102873117A (en) * | 2012-10-10 | 2013-01-16 | 芜湖恒泰有色线材股份有限公司 | Method for manufacturing large-diameter high-frequency resistance welding copper wire manufacturing method |
| CN105323899A (en) * | 2014-08-05 | 2016-02-10 | 宜昌普泰克电力科技有限公司 | Voltage-reducing energy-saving apparatus for gas lamp |
| CN106292827A (en) * | 2016-08-18 | 2017-01-04 | 华为技术有限公司 | A kind of device for generating voltage and semiconductor chip |
| US10345835B2 (en) | 2016-08-18 | 2019-07-09 | Huawei Technologies Co., Ltd. | Voltage generation apparatus and semiconductor chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20131120 |