CN101295931B - AC power source current output stabilization and converting circuit, converter and conversion method - Google Patents
AC power source current output stabilization and converting circuit, converter and conversion method Download PDFInfo
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- CN101295931B CN101295931B CN2008100675463A CN200810067546A CN101295931B CN 101295931 B CN101295931 B CN 101295931B CN 2008100675463 A CN2008100675463 A CN 2008100675463A CN 200810067546 A CN200810067546 A CN 200810067546A CN 101295931 B CN101295931 B CN 101295931B
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Abstract
The invention relates to an AC power source converting circuit, a converter and a converting method with stable current output. The converting circuit comprises an AC current source, a current transformer, a first change-over switch and a transformer for reducing current; the converter comprises an AC current source, a current transformer, an output switch, a transformer for reducing current, a current sampler and a sampling amplifier; the converting method comprises the steps that current is output to the current transformer by the AC current source; the current with different values is output by the current transformer; if the current output is low, the current transformer outputs a fixed current which is converted to low current with the same power by the transformer for reducing current; the transformer for reducing current converts the low current with the same power to stable low current which is output by the current output end and fed back to the AC current source after being sampled and amplified. The conversion circuit, the converter and the converting method of the invention guarantees that the output stability of the low current is not interfered by the power source when the current power source outputs the current with different values; meanwhile, the technical index of the low current output by the transformers with the same volume is completely consistent with the high current.
Description
Technical field
The invention belongs to the current regulation control field, relate to a kind of change-over circuit, transducer and conversion method of AC power source output current being carried out the stability adjusting, be particularly related to a kind ofly, realize anti-electromagnetic interference, low temperature float and electric current output stability accuracy is regulated AC power source current output stabilization change-over circuit, transducer and conversion method in the AC power source or when exchanging the little electric current of standard source output mA level.
Background technology
Along with the progress of science and technology, the power electronics development is maked rapid progress, and supporting with it power equipment is also used just widely.But along with power electronic equipment constantly increases, the defective of power supply quality is also more and more serious, and this certainly will require the performance of power consumption equipment more stable, can be harsher to the technical requirement of power consumption equipment.Therefore a good power equipment must be reliable; Meet the requirement of energy rules, safety requirements; Meet electronics compatibility and other particular demands etc.
Exporting shown in the schematic diagram as the traditional little electric current of Fig. 1, when the little electric current of power source output high precision, generally all is the current source input by high stable, and through the current transformation of current transformer T1, the electric current that obtains different value is exported.It is characterized by, the output of size electric current all is through same current transformer T1 conversion output, circuit structure is simple, but there is following problem: first, though what imported before current transformer T1 is the current source of a high stable, but after current transformer T1 conversion, output is the electric current of different value, its maximum electric current may be 100A, minimum electric current may be again 10mA also, and this big or small electric current is mingled on the same transformer to be exported, under the certain situation of the power supply output ripple amount of influence, output current is more little, the amount of influence of ripple is just big more, and when little electric current 10mA exported, the stability of electric current was very poor; The second, select same power pack T1 output for use because of all gears, under the certain situation of the elementary input current of transformer, the electric current of output is more little, and the number of turn of secondary wire bag is just many more, cause the volume of current transformer just big more, cause production cost to increase greatly.
Summary of the invention
After solving the electric current process current transformer conversion that exists in the prior art, the output current value span is big, when being mingled on the same transformer, exports in this big or small electric current, under the certain situation of the power supply output ripple amount of influence, output current is more little, the amount of influence of ripple is big more, when little electric current 10mA exports, the stability of electric current is very poor, anti-interference is weak and select same power pack output for use because of all gears, under the certain situation of the elementary input current of transformer, the electric current of output is more little, and the number of turn of secondary wire bag is just many more, causes the volume of current transformer just big more, cause technical problems such as production cost increases greatly, the invention provides a kind of AC power source current output stabilization change-over circuit and transducer.
After solving the electric current process current transformer conversion that exists in the prior art, the current value span of output is big.When being mingled on the same transformer, exports in this big or small electric current, under the certain situation of the power supply output ripple amount of influence, output current is more little, the amount of influence of ripple is also just big more, when little electric current 10mA exports, the stability extreme difference of electric current, a little less than the anti-interference, select same power pack output for use because of all gears simultaneously, under the certain situation of the elementary input current of transformer, the electric current of output is more little, and the number of turn of secondary wire bag is just many more, causes the bulky of current transformer, the difficulty increasing that this will cause production cost to increase and produce, the present invention also provides a kind of AC power source current output stabilization conversion method.
The present invention solves the problem that prior art exists, provide the little electric current output in a kind of AC power source stable change-over circuit, the described AC power source stable change-over circuit of little electric current output comprises ac current source, the current transformer that is connected with described ac current source, described AC power source current output stabilization change-over circuit also comprises first change over switch and falls current transformer that described first change over switch is connected with the described current transformer that falls with described current transformer respectively.
According to a preferred embodiment of the present invention: the described current transformer that falls comprises elementary low side output and the output of secondary low side, and described elementary low side output and described secondary low side are output as and are connected in parallel.
According to a preferred embodiment of the present invention: described change-over circuit also comprises Transient Voltage Suppressor, and described Transient Voltage Suppressor and described secondary low side are output as and are connected in parallel.
According to a preferred embodiment of the present invention: described change-over circuit also comprises current transformer, and described current transformer is connected with described current output terminal+IO1 or the current output terminal+IO2 that falls current transformer.
According to a preferred embodiment of the present invention: described current transformer comprises magnetic core reset winding and magnetic core reset circuit, and the described magnetic core winding that resets is connected in the described magnetic core reset circuit.
According to a preferred embodiment of the present invention: described change-over circuit comprises that also sample circuit and current stabilization detect feedback circuit, described sample circuit detects feedback amplifier with described current transformer and described current stabilization respectively and is connected, and described current stabilization detects feedback circuit and is connected with described high stable ac current source.
According to a preferred embodiment of the present invention: described change-over circuit also comprises second change over switch, and described second change over switch is a relay switch, and described second change over switch is connected with described current source output with described current transformer respectively.
According to a preferred embodiment of the present invention: described first change over switch is a high-current relay.
In order to solve the technical problem that exists in the prior art, the present invention also provides a kind of AC power source current output stabilization transducer, described AC power source current output stabilization transducer comprises ac current source, current transformer, the output switch, current transformer falls, current output terminal, current sampler and sampling amplifier, wherein, described ac current source is connected with described current transformer, described current transformer is connected with described first change over switch, described first change over switch is connected with the described current transformer that falls, the described current transformer that falls is connected with described current sampler, described current sampler is connected with described second change over switch with described sampling amplifier respectively, and described sampling amplifier is connected with described ac current source.
According to a preferred embodiment of the present invention: described ac current source is one to have the high stable alternating current power source of automatic protection and adjusting, and described ac current source is connected in the former limit input of current transformer.
According to a preferred embodiment of the present invention: described current transformer is one to have the current transformer (current lifting device) of multichannel output, can be transformed into the alternating current of the fixing input in former limit the stabling currents of the different sizes of secondary output.
According to a preferred embodiment of the present invention: the described current transformer that falls falls the little electric current that becomes mA level constant power to the big electric current by described current transformer, amplify by described current sampler sampling and by described sampling amplifier, the current signal of high stable is fed back to described ac current source, by the little electric current of described second change over switch output, send described current output terminal output simultaneously.
In order to solve the technical problem that exists in the prior art, the present invention also provides a kind of AC power source current output stabilization conversion method, and described conversion method comprises step: the first, pass through described ac current source output current in described current transformer; The second, change the electric current of output different value as requested by described current transformer; Three,, then directly send current output terminal output by described current transformer if be output as big electric current; If be output as little electric current, then described current transformer is exported a fixed current, falls the little electric current that current transformer changes constant power into through described; Four, be transformed into stable little electric current and export by the described current transformer that falls by current output terminal; Five, the little electric current of described output feeds back to described ac current source after sampling and amplifying.
Beneficial effect of the present invention is: when current power source output varies in size electric current, make the output stability height of little electric current by the technology of the present invention, be not subject to the interference of power supply, the present invention becomes reliable and stable little electric current to the big current conversion of AC power source output, converting circuit structure is simple, transducer can make the little electric current of the current transformer output mA level of equal volume, cost is low, and the complete and big electric current of its technical indicator is consistent, the AC power source current output stabilization converter design is reasonable, has high practicality of root and ease for use.
Description of drawings
Fig. 1. the medium and small current output circuit structural representation of prior art;
Fig. 2. whole little electric current output system control circuit schematic diagram in AC power source current output stabilization change-over circuit of the present invention, transducer and the conversion method;
Fig. 3. transducer modular structure schematic diagram in AC power source current output stabilization change-over circuit of the present invention, transducer and the conversion method;
Fig. 4. change method flow diagram in AC power source current output stabilization change-over circuit of the present invention, transducer and the conversion method.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing:
The technology of the present invention is: a big current conversion is become the little current circuit of stable output, and it mainly is applicable to the AC power source and exchanges standard source when exporting little electric current stability, and more high anti-jamming capacity is stronger.
See also Fig. 2, be AC power source current output stabilization change-over circuit of the present invention, the little electric current output system control circuit schematic diagram of transducer and conversion method, as shown in Figure 2, a kind of AC power source current output stabilization change-over circuit, described change-over circuit comprises that high stable ac current source 101 links to each other with described current transformer T1102, described current transformer 102 links to each other with the current source output by change over switch SW1C103, described AC power source current output stabilization change-over circuit also comprises and falls current transformer 104, Transient Voltage Suppressor 105, current transformer 107, current sampling circuit 109, current stabilization detects the feedback amplifier 110 and second change over switch 106, wherein, described change over switch SW1C-first change over switch 103 is connected with the described current transformer 104 that falls with described current transformer T1102 respectively, the described current transformer 104 that falls comprises elementary low side output and the output of secondary low side, and described elementary low side output is output as with described secondary low side and is connected in parallel; Described Transient Voltage Suppressor 105 is output as with described secondary low side and is connected in parallel; Described current transformer 107 is connected with described current output terminal+IO1 or the current output terminal+IO2 that falls current transformer 104; Described sample circuit 109 detects feedback amplifier 110 with described current transformer 107 and described current stabilization respectively and is connected, and described current stabilization detects feedback amplifier 110 and is connected with described high stable ac current source 101; Described second change over switch 106 is a relay switch, and described second change over switch 106 is connected with described current source output IOUT with described current transformer 107 respectively.
Described current transformer 107 comprises magnetic core reset winding and magnetic core reset circuit 108, and the described magnetic core winding that resets is connected in the described magnetic core reset circuit 108.
See also Fig. 3 AC power source current output stabilization change-over circuit of the present invention, transducer modular structure schematic diagram in transducer and the conversion method, as shown in Figure 3, the little electric current output in described AC power source is stablized transducer and is comprised a high stable ac current source 101, described high stable ac current source 101 is connected in the former limit of described current transformer 102, it provides a stable alternating current for current transformer 102, also receive little current sampling signal simultaneously, 102 fixing electrorheologicals of described current transformer change the big or small electric current of different gears into, and its secondary connects first change over switch 103.Described first change over switch, 103 normally closed points directly link to each other with current output terminal 112,103 normal battles of described first change over switch with fall current transformer 104 and link to each other.The described current transformer 104 that falls is the little electric current that becomes equal-wattage by the current conversion of described current transformer 102, and described little electric current directly send current output terminal 112 outputs on the one hand, on the other hand by current sampler 109 sampling feed signals amplifiers.Send high stable ac current source 101 to finish closed loop feedback after finishing amplification by described signal amplifier 111, make the little electric current of output more reliable and more stable.
See also in Fig. 4 AC power source current output stabilization change-over circuit of the present invention, transducer and the conversion method and change method flow diagram, as shown in Figure 4, described conversion method mainly comprises step: the first, pass through described ac current source 101 output currents in described current transformer 102; The second, change the electric current of output different value as requested by described current transformer 102; Three,, then directly send current output terminal 112 outputs by described current transformer 102 if be output as big electric current; If be output as little electric current, then described current transformer 102 outputs one fixed current falls the little electric current that current transformer 104 changes constant power into through described; Four, be transformed into stable little electric current by current output terminal 112 outputs by the described current transformer 104 that falls; Five, the little electric current of described output feeds back to described ac current source 101 after sampling and amplifying.
The present invention will be further described below in conjunction with embodiment:
The preceding termination of described current transformer T1102 (first current transformer 102) be the ac current source of a high stable, when this ac current source is exported the electric current of different gears at described current transformer T1102, its magnitude of voltage that provides all is that certain (for example: the full volt value of supposing current source output is 20V/3A, no matter the current value of described current transformer T1102 output is 10A or 5A, its output all is 20V, and just current value changes when 10A is with different current loading with 5A).When described current transformer T1102 exported the current value of different gears, definite because of the current source magnitude of voltage of elementary access, for described current transformer T1102, the amount of influence that power supply ripple disturbs was also just determined.The output valve of electric current is more little, and the ratio that shared total output current is measured in the influence that power supply ripple disturbs is also just big more, and when the little electric current of output, technical indicator is with regard to extreme difference like this.Suppose that the output valve of described current transformer T1102 is big electric current 5A when needs output current numerical value is 5A or these two electric currents of 50mA.When output 5A electric current, the pin 3 of the described first change over switch SW1C103 (relay switch) is communicated with pin two, does not at this moment need to carry out the switching of on off state, and electric current is directly exported from IOUT; When output 50mA electric current, the described first change over switch SW1C103 (relay switch) switches to normal battle, pin 3 is communicated with pin 4, (guarantee certain current amplitude to current transformer T1102 output fixed current 5A simultaneously this moment, be assumed to be 5V, under the situation that can guarantee fan-out capability, the big more technical indicator of the volt value of electric current is good more) electric current be sent to described falling among the current transformer T2104, by the described current transformer T2104 conversion output 50mA electric current that falls, and the volt value of electric current is 500V, described fall that current transformer T2104 is used for that constant power exports different current values current transformer 104 falls.P=5V * 5A=0.05A * 500V=25W just, though the described on the one hand electric current that falls current transformer T2104 output is 50mA, the amplitude of output is 500V, the ratio of the shared output current of interference of power supply is just very little; Described on the other hand fall current transformer T2104 just/secondary low side connects together, and can suppress electromagnetic interference effectively, and electromagnetic compatibility is had certain benefit.
Describedly fall the secondary of current transformer T2104 and meet a described Transient Voltage Suppressor TVS1105, be used for occurring avoiding the described circuit that falls current transformer T2104 output too high voltages infringement back level when unusual when peripheral circuit.
The described current signal that falls current transformer T2104 output, by+IO1 or+IO2 electric current output line is linked on the described small current mutual inductor CT1107.Described small current mutual inductor CT1107 is used for the sample of signal of falling current transformer T2104 output current to described, sampled signal is detected feedback amplifier by described sample circuit 109 and described current stabilization feed back to described ac current source (high stable current source input), adjust the current value of input, thereby the described little electric current that falls current transformer T2104 output is accurately stablized.
Small current mutual inductor described in the present invention 107 also has a magnetic core (returning zero) the winding N3 that resets, it inserts on the described magnetic core reset circuit 108, the magnetic core that described N3 winding is mainly used in described small current mutual inductor CT1107 resets, can make described small current mutual inductor CT1107 magnetic core be returned to zero on the one hand, prevent that magnetic core is saturated at each electric current cycle; Another reverse side also makes the higher output of the acquisition precision of described small current mutual inductor CT1107 more stable.
As shown in the figure, output termination one described second change over switch 106 (switch relay SW1B) of described small current mutual inductor 107 is used to export the electric current of different gears.
Beneficial effect of the present invention is: when current power source output varies in size electric current, make the output stability height of little alternating current by the technology of the present invention, be not subject to the interference of power supply, AC power source current output stabilization converting circuit structure of the present invention is simple, transducer can equal volume transformer export little electric current, cost is low, and the complete and big electric current of its technical indicator is consistent, it is reasonable that conversion designs is stablized in the little electric current output in AC power source, has high practicality of root and ease for use.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. AC power source current output stabilization change-over circuit, comprise ac current source (101) and current transformer (102), described ac current source (101) is connected with described current transformer (102), it is characterized in that: described AC power source current output stabilization change-over circuit also comprises first change over switch (103) and falls current transformer (104), wherein, described ac current source (101) is connected in the former limit of described current transformer (102), the secondary of described current transformer (102) connects first change over switch (103), the normally closed point of described first change over switch (103) directly is connected with current output terminal IOUT, and normal battle of described first change over switch (103) links to each other with the described current transformer (104) that falls.
2. according to the described change-over circuit of claim 1, it is characterized in that: the described current transformer (104) that falls comprises elementary low side output and the output of secondary low side, and described elementary low side output is connected to ground with described secondary low side output.
3. according to claim 1 or 2 described change-over circuits, it is characterized in that: describedly fall the secondary of current transformer (104) and connect a transient state voltage suppressor (105).
4. according to the described change-over circuit of claim 1, it is characterized in that: described change-over circuit also comprises current transformer (107), described current transformer (107) is connected with described current output terminal+IO1 or the current output terminal+IO2 that falls current transformer (104), wherein, described current transformer (107) comprises magnetic core reset winding and magnetic core reset circuit (108), and the described magnetic core winding that resets is connected in the described magnetic core reset circuit (108).
5. according to the described change-over circuit of claim 4, it is characterized in that: described change-over circuit comprises that also sample circuit (109) and current stabilization detect feedback circuit (110), described sample circuit (109) detects feedback circuit (110) with described current transformer (107) and described current stabilization respectively and is connected, and described current stabilization detects feedback circuit (110) and is connected with described ac current source (101).
6. according to the described change-over circuit of claim 4, it is characterized in that: described change-over circuit also comprises second change over switch (106), described second change over switch (106) is a relay switch, and described second change over switch (106) is connected with described current output terminal IOUT with described current transformer (107) respectively.
One kind according to claim 1 the electric current output of AC power source current output stabilization change-over circuit stablize conversion method, it is characterized in that: described conversion method comprises step:
A: arrive in the described current transformer (102) by described ac current source (101) output current;
B: the electric current that changes the output different value by described current transformer (102) as requested;
C:, then directly send current output terminal IOUT output by described current transformer (102) if be output as big electric current; If be output as little electric current, then described current transformer (102) output one fixed current falls the little electric current that current transformer (104) changes constant power into through described;
D: be transformed into stable little electric current and export by current output terminal IOUT by the described current transformer (104) that falls;
E: the little electric current of described output feeds back to described ac current source (101) after sampling and amplifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100675463A CN101295931B (en) | 2008-05-30 | 2008-05-30 | AC power source current output stabilization and converting circuit, converter and conversion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100675463A CN101295931B (en) | 2008-05-30 | 2008-05-30 | AC power source current output stabilization and converting circuit, converter and conversion method |
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| Publication Number | Publication Date |
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| CN101295931A CN101295931A (en) | 2008-10-29 |
| CN101295931B true CN101295931B (en) | 2010-11-03 |
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| CN2008100675463A Expired - Fee Related CN101295931B (en) | 2008-05-30 | 2008-05-30 | AC power source current output stabilization and converting circuit, converter and conversion method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111257617B (en) * | 2020-01-19 | 2022-08-05 | 苏州英威腾电力电子有限公司 | Multi-power-section voltage and current sampling method, device and system |
| CN112710980A (en) * | 2020-12-17 | 2021-04-27 | 国网北京市电力公司 | Power source for electric energy meter verification |
| CN112925373B (en) * | 2021-01-27 | 2022-11-08 | 南京丹迪克电力仪表有限公司 | Multi-range constant current source circuit, multi-range constant current source and control method |
| CN114420431A (en) * | 2022-01-29 | 2022-04-29 | 上海良治电器技术有限公司 | Conversion method of single-phase transformers with different structural iron core types |
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