CN100538583C - Circuit for power compensation for supplying electromagnetism by cycle - Google Patents
Circuit for power compensation for supplying electromagnetism by cycle Download PDFInfo
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- CN100538583C CN100538583C CNB2007100931906A CN200710093190A CN100538583C CN 100538583 C CN100538583 C CN 100538583C CN B2007100931906 A CNB2007100931906 A CN B2007100931906A CN 200710093190 A CN200710093190 A CN 200710093190A CN 100538583 C CN100538583 C CN 100538583C
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Abstract
A kind of circuit for power compensation for supplying electromagnetism by cycle, comprise power circuit, current sampling feedback circuit, voltage sampling feedback circuit, feedback compensation circuit, current sampling circuit, it is characterized in that: an input end of described current sampling feedback circuit is connected on the connected node of the anode of external dc power and oscillatory circuit, another input end of current sampling feedback circuit is connected on the connected node of current sampling circuit and current foldback circuit, and the output terminal of current sampling feedback circuit connects the first input end of feedback compensation circuit; An input end of described voltage sampling feedback circuit is connected on the connected node of the anode of external dc power and oscillatory circuit, another input end grounding of voltage sampling feedback circuit, the output terminal of voltage sampling feedback circuit connects second input end of feedback amplifier; This invention can be widely used in having a good application prospect in industrial control equipment, the instruments such as electric isolator and safety barrier.
Description
Technical field
The present invention relates to a kind of control circuit that is used for power isolator, be specifically related to a kind of circuit for power compensation for supplying electromagnetism by cycle.
Background technology
As the Signal Spacing transmitter equipment between industry spot and the pulpit instrument, signal isolator and safety barrier play an important role always, be not disturb mutually for increasing the instrument load capacity and guaranteeing to connect between the instrument of same signal in the ingredient commercial production important in the industrial control system, improve electrical safety performance, need with the input voltage, electric current or signals such as frequency, resistance gather, amplification, computing and carry out anti-interference process after, export the electric current and the voltage signal of isolating again, the secondary instrument of giving of safety uses.Isolator and safety barrier generally partly are made of input signal processing unit, isolated location, output signal processing unit, power supply etc. 4.Wherein, isolated location is the significant element of decision technical target of the product.Isolation technology mainly contains magnetic isolation and light isolation two big classes at present.The buffer circuit form has direct modulation coupling, various ways such as feedback modulation coupling, concrete what form that adopts will be decided according to the technical indicator of product, generally can roughly be divided into the switching value signal and adopt light to isolate, the mode that analog signals adopts magnetic to isolate.From the technical sophistication degree, magnetic isolation ratio light isolation processing technical sophistication adopts the magnetic isolation technology, and the deviser can adopt suitable design proposal according to technical indicator, and the linearity of isolation, precision can be controlled flexibly according to product requirement.And the linearity that light is isolated, precision can only rely on the technical indicator that device producer provides, the adjustable mode of designer seldom, also can not surpass the technical indicator that producer provides, because power consumption is big, photoelectricity is isolated can not realize passive isolation, in existing isolator and safety barrier product, do not adopt loop power supply parameter type power compensating circuit, the non-linear of isolator and safety barrier will increase and increase with load, per 100 ohm load are non-linear will to increase general 1/1000, load generally is 250 ohm～550 ohm, and nonlinearity erron will be very big.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of reliability height, circuit for power compensation for supplying electromagnetism by cycle that efficient is high.
In order to solve the problems of the technologies described above, a technical scheme of the present invention is, a kind of circuit for power compensation for supplying electromagnetism by cycle is provided, comprise power circuit, current sampling feedback circuit, voltage sampling feedback circuit, feedback compensation circuit, current sampling circuit, wherein, external dc power, oscillatory circuit, current foldback circuit, current sampling circuit are connected in series in proper order, one end of current sampling circuit is connected to the negative terminal of external dc power, the connected node ground connection of current sampling circuit and equivalent load by equivalent load; The other end of current sampling circuit connects current foldback circuit;
Wherein, an input end of described current sampling feedback circuit is connected on the connected node of the anode of external dc power and oscillatory circuit, another input end of current sampling feedback circuit is connected on the connected node of current sampling circuit and current foldback circuit, and the output terminal of current sampling feedback circuit connects the first input end of feedback compensation circuit; Described current sampling feedback circuit produces the voltage with the electric current I f size variation that flows through equivalent load Rf according to the electric current I f size that flows through equivalent load Rf, outputs to the feedback compensation circuit;
An input end of described voltage sampling feedback circuit is connected on the connected node of the anode of external dc power and oscillatory circuit, another input end grounding of voltage sampling feedback circuit, the output terminal of voltage sampling feedback circuit connects second input end of feedback compensation circuit; Described voltage sampling feedback circuit produces the voltage with equivalent load Rf size variation according to equivalent load Rf size, outputs to the feedback compensation circuit;
One end of described feedback compensation circuit is connected on the connected node of the anode of external dc power and oscillatory circuit, the other end ground connection of feedback compensation circuit, the first input end of described feedback compensation circuit connects the output terminal of current sampling feedback circuit simultaneously, and second input end connects the output terminal of voltage sampling feedback circuit and the output terminal of working current control circuit; The difference of the voltage that voltage that described feedback compensation circuit produces according to the current sampling feedback circuit and voltage sampling feedback circuit produce produces offset current Ic, and the electric current that flows through on the equivalent load Rf is compensated, and guarantees control accuracy;
Described working current control circuit is connected between second input end and ground of feedback compensation circuit, and the control end of working current control circuit is connected with the negative terminal of power circuit simultaneously; The effect of working current control circuit is to change or the working current of temperature, feedback compensation circuit when changing as externally fed voltage E, and the size of control compensation electric current further improves the control accuracy grade;
The anode of described power circuit is connected with the anode of external dc power, and the external dc power voltage transitions is become the required operating voltage of feedback compensation circuit.
A kind of preferred version according to circuit for power compensation for supplying electromagnetism by cycle of the present invention, described feedback compensation circuit comprises triode Q1, operational amplifier U1A, resistance R 1～R5, the in-phase input end of described operational amplifier U1A is connected to the output terminal of current sampling feedback circuit by resistance R 4, the inverting input of operational amplifier U1A is connected to the output terminal of voltage sampling feedback circuit by resistance R 5, and described operational amplifier U1A is powered by power circuit; The emitter of described triode Q1 is by resistance R 1 ground connection, connect the inverting input of operational amplifier U1A simultaneously by resistance R 3, the collector of triode Q1 connects the anode of external dc power, and the base stage of triode Q1 connects the output terminal of operational amplifier U1A by resistance R 2.
A kind of preferred version according to circuit for power compensation for supplying electromagnetism by cycle of the present invention, described working current control circuit comprises resistance R 6, R7, described resistance R 6, R7 are connected in series, series connection back one end ground connection, the other end connects second input end of feedback compensation circuit, and the connected node of resistance R 6, R7 is connected to the negative terminal of power circuit.
A kind of preferred version according to circuit for power compensation for supplying electromagnetism by cycle of the present invention, described voltage sampling feedback circuit is made of resistance R 10, adjustable resistance W2, described resistance R 10 and adjustable resistance W2 are connected in series between the anode and ground of external dc power, and the connected node of resistance R 10 and adjustable resistance W2 is connected to second input end of feedback compensation circuit.
A kind of preferred version according to circuit for power compensation for supplying electromagnetism by cycle of the present invention; described current sampling feedback circuit comprises adjustable constant-flow source IC1 and adjustable resistance W1; described adjustable constant-flow source IC1 and adjustable resistance W1 are connected in series; wherein the input end of adjustable constant-flow source IC1 is connected to the anode of external power source E; the output terminal of adjustable constant-flow source IC1 connects adjustable resistance W1; and their connected node is connected with the first input end of feedback compensation circuit, and the other end of adjustable resistance W1 is connected on the connected node of current foldback circuit and current sampling circuit.
A kind of preferred version according to circuit for power compensation for supplying electromagnetism by cycle of the present invention; described current foldback circuit comprises operational amplifier U1B; fet Q2; resistance R 12; R13; the in-phase input end of described operational amplifier U1B is connected to the anode of power circuit by resistance R 12; and be connected to the negative terminal of power circuit by resistance R 13; the inverting input of described operational amplifier U1B is connected to ground by current sampling circuit 6; the output terminal of described operational amplifier U1B is connected with the grid of fet Q2; the source electrode of fet Q2 is connected to the inverting input of operational amplifier U1B, and the drain electrode of fet Q2 connects oscillatory circuit.
The beneficial effect of a kind of loop power supply parameter type power compensating circuit of the present invention is; owing to adopt the current sampling feedback circuit; voltage sampling feedback circuit and feedback compensation circuit; can cause that change in voltage and electric current change to load variations and carry out the loop current compensation; simultaneously owing to adopt the working current control circuit; supply voltage externally; temperature; the working current of operational amplifier compensates when changing; therefore has the control accuracy height; good linearity; good product consistency; production technology is simple; and owing to adopt current foldback circuit; can when surpassing setting value, electric current disconnect current supply circuit; therefore has long service life; high reliability features can be widely used in industrial control equipments such as electric isolator and safety barrier; in the instrument, have a good application prospect.
Description of drawings
Fig. 1 is the theory diagram of loop power supply parameter type power compensating circuit of the present invention.
Fig. 2 is the schematic diagram of loop power supply parameter type power compensating circuit of the present invention.
Fig. 3 is loop power supply parameter type power compensating circuit of the present invention application circuit in the two-wire system loop power supply
Embodiment
Referring to Fig. 1, circuit for power compensation for supplying electromagnetism by cycle of the present invention is made of current sampling feedback circuit 1, voltage sampling feedback circuit 2, feedback compensation circuit 4, working current control circuit 5, current sampling circuit 6, current foldback circuit 8, power circuit 7, wherein external dc power E, oscillatory circuit 9, current foldback circuit 8, current sampling circuit 6 orders are connected in series, and current sampling circuit 6 is connected between the negative terminal and current foldback circuit 8 of external dc power E; An input end of current sampling feedback circuit 1 is connected on the connected node of the anode of external dc power E and oscillatory circuit 9, another input end of current sampling feedback circuit 1 is connected on the connected node of current sampling circuit 6 and current foldback circuit 8, and the output terminal of current sampling feedback circuit 1 connects the first input end of feedback compensation circuit 4; An input end of voltage sampling feedback circuit 2 is connected on the connected node of the anode of external dc power E and oscillatory circuit 9, another input end grounding of voltage sampling feedback circuit 2, the output terminal of voltage sampling feedback circuit 2 connects second input end of feedback compensation circuit 4; One end of feedback compensation circuit 4 is connected on the connected node of the anode of external dc power E and oscillatory circuit 9, the other end ground connection of feedback compensation circuit 4, the first input end of described feedback compensation circuit 4 connects the output terminal of current sampling feedback circuit 1 simultaneously, and second input end connects the output terminal of voltage sampling feedback circuit 2 and the output terminal of working current control circuit 5; Working current control circuit 5 is connected between second input end and ground of feedback compensation circuit 4, the control end of working current control circuit 5 is connected with the negative terminal of power circuit 7 simultaneously, and the anode of power circuit 7 is connected with the anode of external dc power E, the negative terminal of power circuit 7 is inner floating ground.
Wherein, current sampling feedback circuit 1 produces the voltage with the electric current I f size variation that flows through equivalent load Rf according to the electric current I f size that flows through equivalent load Rf, outputs to feedback compensation circuit 4; Voltage sampling feedback circuit 2 produces the voltage with equivalent load Rf size variation according to equivalent load Rf size, outputs to feedback compensation circuit 4; The difference of the voltage that voltage that described feedback compensation circuit 4 produces according to current sampling feedback circuit 1 and voltage sampling feedback circuit 2 produce, produce offset current Ic, the electric current that flows through on the equivalent load Rf is compensated, feedback compensation circuit 4 is subjected to the control of working current control circuit 5 simultaneously, when the working current of external dc power E variation or temperature, feedback compensation circuit 4 changed, the electric current in the convection current overload compensated.
Referring to Fig. 2, Fig. 3, described feedback compensation circuit 4 is made of triode Q1, operational amplifier U1A, resistance R 1～R5, capacitor C 1, C3, the in-phase input end of described operational amplifier U1A is connected to the output terminal of current sampling feedback circuit 1 by resistance R 4, the inverting input of operational amplifier U1A is connected to the output terminal of voltage sampling feedback circuit 2 by resistance R 5, and described operational amplifier U1A is by power circuit 7 power supplies; The emitter of described triode Q1 is by resistance R 1 ground connection, connect the inverting input of operational amplifier U1A simultaneously by resistance R 3, the collector of triode Q1 connects the anode of external dc power E, and the base stage of triode Q1 connects the output terminal of operational amplifier U1A by resistance R 2; Described capacitor C 1 is connected between the output terminal and inverting input of operational amplifier U1A, and described capacitor C 3 is connected between the in-phase input end and ground of operational amplifier U1A.
Described working current control circuit 5 is made of resistance R 6, R7, capacitor C 2, and resistance R 6, R7 are connected in series, series connection back one end ground connection, and the other end connects second input end of feedback compensation circuit 4, and the connected node of resistance R 6, R7 is connected to the negative terminal of power circuit 7; Capacitor C 2 is connected between the negative terminal and ground of power circuit 7.
Described voltage sampling feedback circuit 2 is made of resistance R 10, adjustable resistance W2, described resistance R 10 and adjustable resistance W2 are connected in series between the anode and ground of external dc power E, and the connected node of resistance R 10 and adjustable resistance W2 is connected to second input end of feedback compensation circuit 4.
Described current sampling feedback circuit 1 is by adjustable constant-flow source IC1; capacitor C 4; resistance R 14 is set in the adjustable constant-flow source and adjustable resistance W1 constitutes; the input end of adjustable constant-flow source IC1 is connected to the anode of external power source E; the output terminal of adjustable constant-flow source IC1 connects adjustable resistance W1; and their connected node connects the in-phase input end of operational amplifier U1A by resistance R 4; the output terminal of adjustable constant-flow source IC1 is by capacitor C 4 ground connection simultaneously; and the adjustment end that resistance R 14 connects adjustable constant-flow source IC1 is set by the adjustable constant-flow source; the other end of adjustable resistance W1 is connected on the connected node of current foldback circuit 8 and current sampling circuit 6; described current sampling circuit 6 is by resistance R 9; R11; adjustable resistance W3 constitutes, wherein adjustable resistance W1; W2; W3 all can adopt semifixed resistor row.
Described current foldback circuit 8 is by operational amplifier U1B; fet Q2; resistance R 12; R13 constitutes; the in-phase input end of described operational amplifier U1B is connected to the anode of power circuit 7 by resistance R 12; and be connected to the negative terminal of power circuit 7 by resistance R 13; the sample resistance R9 of the inverting input of described operational amplifier U1B by being connected in parallel; R11; adjustable resistance W3 is connected to ground; the output terminal of described operational amplifier U1B is connected with the grid of fet Q2; the source electrode of fet Q2 is connected to the inverting input of operational amplifier U1B, and the drain electrode of fet Q2 connects oscillatory circuit 9.
Described current sampling circuit 6 is made of the sample resistance R9, the R11 that are connected in parallel, adjustable resistance W3.
Described power circuit 7 is made of three terminal regulator U2, voltage stabilizing diode D1, fet Q3, Q4, Q5, capacitor C 5, C6, C7, resistance R 15～R24.
Described oscillatory circuit 9 is made of capacitor C 8～C13, resistance R 25, R26, diode D2, D3, triode Q7, Q6, isolating transformer B.
The principle of work of described circuit for power compensation for supplying electromagnetism by cycle is: the electric current I f that flows through equivalent load Rf equals the offset current Ic that feedback compensation circuit 4 produces and adds the current Ib that flows through series loop.When equivalent load Rf increases, because it is constant flowing through the electric current I f of equivalent load Rf, the voltage drop that produces at equivalent load Rf increases, the voltage that external dc power E offers oscillatory circuit 9 reduces, the voltage at the connected node place of resistance R 10 and adjustable resistance W2 reduces, and the output current of operational amplifier U1A increases, and the emitter current that flows through triode Q1 increases, be that offset current Ic increases, the electric current that flows through equivalent load Rf is increased; In like manner, when equivalent load Rf reduces, equivalent load Rf goes up the voltage drop that produces and reduces, the voltage at the connected node place of resistance R 10 and adjustable resistance W2 increases, the output current of operational amplifier U1A reduces, the emitter current that flows through triode Q1 reduces, and promptly offset current Ic reduces, and the electric current that flows through equivalent load Rf is reduced.
When load one timing, equivalent load Rf is certain, it is certain that equivalent load Rf goes up the voltage drop that produces, if when at this moment flowing through the current Ib variation of series loop, the electric current of this variation is by the voltage of sample resistance R9, R11, adjustable resistance W3, a variation of generation, and the voltage of this variation acts on the in-phase input end of operational amplifier U1A by current sampling feedback circuit 1.If flowing through the current Ib electric current of series loop increases, the output voltage of current sampling feedback circuit 1 increases, the voltage that is the input end in the same way of operational amplifier U1A increases, the output current of operational amplifier U1A increases, the electric current that flows through triode Q1 emitter increases, be that offset current Ic increases, and along with the electric current that flows through equivalent load Rf increases and the increase compensation rate; In like manner, if flowing through the current Ib electric current of series loop reduces, the output voltage of current sampling feedback circuit 1 reduces, the voltage that is the input end in the same way of operational amplifier U1A reduces, the output current of operational amplifier U1A reduces, the electric current that flows through triode Q1 emitter reduces, and promptly offset current Ic reduces, and reduces along with the electric current that flows through equivalent load Rf and reduce compensation rate.
The effect of working current control circuit 5 is that the working current of power circuit 7 and operational amplifier U1A is controlled; Its principle of work is: because the working current of external dc power E variation or temperature, operational amplifier U1A is when changing; These variable quantities should be compensated; Otherwise can influence control accuracy.The working current of power circuit 7 and operational amplifier U1A flows through voltage that R7 produces affacts operational amplifier by resistance R 6 inverting input.When the total working current of power circuit 7 and operational amplifier U1A increases, the electric current of the inverting input of operational amplifier U1A is increased, thereby make offset current Ic reduce; Otherwise, when the electric current of the inverting input of operational amplifier U1A reduces, thereby make offset current Ic increase; Thereby the influence that the electric current I f of equivalent load Rf is not subjected to the working current variation of power circuit 7 and operational amplifier U1A is flow through in assurance.
Find by test, utilize the working current circuit that the big or small of electric current that working current compensates generally got R1=R7 mainly by the resistance decision of resistance R 1, R3, R6, R7, R3=R6, control accuracy can reach 1/1000, and is not subjected to the influence of load variations.
Claims (6)
1, a kind of circuit for power compensation for supplying electromagnetism by cycle, comprise power circuit (7), current sampling feedback circuit (1), voltage sampling feedback circuit (2), feedback compensation circuit (4), current sampling circuit (6), wherein, external dc power (E), oscillatory circuit (9), current foldback circuit (8), current sampling circuit (6) order are connected in series, one end of current sampling circuit (6) is connected to the negative terminal of external dc power (E) by equivalent load (Rf), the connected node ground connection of current sampling circuit (6) and equivalent load (Rf); The other end of current sampling circuit (6) connects current foldback circuit (8); It is characterized in that:
Current sampling feedback circuit (1): an input end of described current sampling feedback circuit (1) is connected on the connected node of the anode of external dc power (E) and oscillatory circuit (9), another input end of current sampling feedback circuit (1) is connected on the connected node of current sampling circuit (6) and current foldback circuit (8), and the output terminal of current sampling feedback circuit (1) connects the first input end of feedback compensation circuit (4);
Voltage sampling feedback circuit (2): an input end of described voltage sampling feedback circuit (2) is connected on the connected node of the anode of external dc power (E) and oscillatory circuit (9), another input end grounding of voltage sampling feedback circuit (2), the output terminal of voltage sampling feedback circuit (2) connects second input end of feedback compensation circuit (4);
Feedback compensation circuit (4): an end of described feedback compensation circuit (4) is connected on the connected node of the anode of external dc power (E) and oscillatory circuit (9), the other end ground connection of feedback compensation circuit (4), the first input end of described feedback compensation circuit (4) connects the output terminal of current sampling feedback circuit (1) simultaneously, and second input end connects the output terminal of voltage sampling feedback circuit (2) and the output terminal of working current control circuit (5);
Working current control circuit (5): working current control circuit (5) is connected between second input end and ground of feedback compensation circuit (4), and the control end of working current control circuit (5) is connected with the negative terminal of power circuit (7) simultaneously;
Power circuit (7): the anode of power circuit (7) is connected with the anode of external dc power (E), and the external dc power voltage transitions is become the required operating voltage of feedback compensation circuit (4).
2, a kind of circuit for power compensation for supplying electromagnetism by cycle according to claim 1, it is characterized in that: described feedback compensation circuit (4) comprises triode Q1, operational amplifier U1A, resistance R 1～R5, the in-phase input end of described operational amplifier U1A is connected to the output terminal of current sampling feedback circuit (1) by resistance R 4, the inverting input of operational amplifier U1A is connected to the output terminal of voltage sampling feedback circuit (2) by resistance R 5, and described operational amplifier U1A is powered by power circuit (7); The emitter of described triode Q1 is by resistance R 1 ground connection, connect the inverting input of operational amplifier U1A simultaneously by resistance R 3, the collector of triode Q1 connects the anode of external dc power (E), and the base stage of triode Q1 connects the output terminal of operational amplifier U1A by resistance R 2.
3, a kind of circuit for power compensation for supplying electromagnetism by cycle according to claim 1 and 2 is characterized in that: described working current control circuit (5) comprises resistance R 6, R7; Described resistance R 6, R7 are connected in series, the end ground connection after the series connection, and the other end connects second input end of feedback compensation circuit (4), and the connected node of resistance R 6, R7 is connected to the negative terminal of power circuit (7).
4, a kind of circuit for power compensation for supplying electromagnetism by cycle according to claim 3, it is characterized in that: described voltage sampling feedback circuit (2) is made of resistance R 10, adjustable resistance W2, described resistance R 10 and adjustable resistance W2 are connected in series between the anode and ground of external dc power (E), and the connected node of resistance R 10 and adjustable resistance W2 is connected to second input end of feedback compensation circuit (4).
5; a kind of circuit for power compensation for supplying electromagnetism by cycle according to claim 4; it is characterized in that: described current sampling feedback circuit (1) comprises adjustable constant-flow source IC1 and adjustable resistance W1; described adjustable constant-flow source IC1 and adjustable resistance W1 are connected in series; wherein the input end of adjustable constant-flow source IC1 is connected to the anode of external power source E; the output terminal of adjustable constant-flow source IC1 connects adjustable resistance W1; and their connected node is connected with the first input end of feedback compensation circuit (4), and the other end of adjustable resistance W1 is connected on the connected node of current foldback circuit (8) and current sampling circuit (6).
6; a kind of circuit for power compensation for supplying electromagnetism by cycle according to claim 5; it is characterized in that: described current foldback circuit (8) comprises operational amplifier U1B; fet Q2; resistance R 12; R13; the in-phase input end of described operational amplifier U1B is connected to the anode of power circuit (7) by resistance R 12; and be connected to the negative terminal of power circuit (7) by resistance R 13; the inverting input of described operational amplifier U1B is connected to ground by current sampling circuit (6); the output terminal of described operational amplifier U1B is connected with the grid of fet Q2; the source electrode of fet Q2 is connected to the inverting input of operational amplifier U1B, and the drain electrode of fet Q2 connects oscillatory circuit (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100931906A CN100538583C (en) | 2007-12-21 | 2007-12-21 | Circuit for power compensation for supplying electromagnetism by cycle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100931906A CN100538583C (en) | 2007-12-21 | 2007-12-21 | Circuit for power compensation for supplying electromagnetism by cycle |
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| Publication Number | Publication Date |
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| CN101256422A CN101256422A (en) | 2008-09-03 |
| CN100538583C true CN100538583C (en) | 2009-09-09 |
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| CNB2007100931906A Expired - Fee Related CN100538583C (en) | 2007-12-21 | 2007-12-21 | Circuit for power compensation for supplying electromagnetism by cycle |
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Families Citing this family (2)
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| CN103813557B (en) * | 2014-02-17 | 2016-02-03 | 美的集团股份有限公司 | Electromagnetic heater and Poewr control method thereof and power control system |
| CN113095034B (en) * | 2020-01-09 | 2023-12-15 | 瑞昱半导体股份有限公司 | Method and circuit system for compensating voltage drop by using extra power grid |
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|---|---|---|---|---|
| US4856345A (en) * | 1987-04-13 | 1989-08-15 | Aichi Tokei Denki Co., Ltd | Method and apparatus for making compensation for DC offset voltage generated in aplifying circuit in electromagnetic flowmeter |
| CN1391719A (en) * | 1999-10-01 | 2003-01-15 | 在线能源供给公司 | Non-saturating magnetic elements power converters and surge protection |
| CN1862907A (en) * | 2006-05-31 | 2006-11-15 | 哈尔滨工业大学 | Rotary electromagnetic type active and reactive power continuously regulater |
| CN1964172A (en) * | 2005-11-09 | 2007-05-16 | 崇贸科技股份有限公司 | A switch-over type control device for output power compensation |
| CN2919330Y (en) * | 2006-04-13 | 2007-07-04 | 上海稳稳稳压器有限公司 | Full-automaticity high-power compensating type synchronous electricity-saving manostat |
| CN201130331Y (en) * | 2007-12-21 | 2008-10-08 | 重庆宇通系统软件有限公司 | Loop power supply parameter type magnetic power compensation circuit |
-
2007
- 2007-12-21 CN CNB2007100931906A patent/CN100538583C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4856345A (en) * | 1987-04-13 | 1989-08-15 | Aichi Tokei Denki Co., Ltd | Method and apparatus for making compensation for DC offset voltage generated in aplifying circuit in electromagnetic flowmeter |
| CN1391719A (en) * | 1999-10-01 | 2003-01-15 | 在线能源供给公司 | Non-saturating magnetic elements power converters and surge protection |
| CN1964172A (en) * | 2005-11-09 | 2007-05-16 | 崇贸科技股份有限公司 | A switch-over type control device for output power compensation |
| CN2919330Y (en) * | 2006-04-13 | 2007-07-04 | 上海稳稳稳压器有限公司 | Full-automaticity high-power compensating type synchronous electricity-saving manostat |
| CN1862907A (en) * | 2006-05-31 | 2006-11-15 | 哈尔滨工业大学 | Rotary electromagnetic type active and reactive power continuously regulater |
| CN201130331Y (en) * | 2007-12-21 | 2008-10-08 | 重庆宇通系统软件有限公司 | Loop power supply parameter type magnetic power compensation circuit |
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