CN105676936A - Ripple current generating circuit - Google Patents
Ripple current generating circuit Download PDFInfo
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- CN105676936A CN105676936A CN201610040376.4A CN201610040376A CN105676936A CN 105676936 A CN105676936 A CN 105676936A CN 201610040376 A CN201610040376 A CN 201610040376A CN 105676936 A CN105676936 A CN 105676936A
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
Abstract
Provided are a ripple current generating method and circuit. The ripple current generating circuit comprises a direct current power supply U, an inductor L, a lossless ripple current generator (100), a measured capacitor and a light-emitting diode (LED) (200), wherein the lossless ripple current generator comprises a pulse width modulation control circuit P; a freewheeling current of the lossless ripple current generator (100) directly returns to the direct current power supply, and the current direction of the direct current power supply U supplying electricity to the outside through the inductor L is opposite to the positive breakover direction of the LED. When the measured capacitor is normal, a magnetizing current of a switching tube Q basically does not appear in the inductor L, and the LED does not give out light; when ESR of the measured capacitor rises a lot, the magnetizing current of the Q appears in the L; when the Q is turned off, the magnetizing current flowing through the L cannot conduct sudden change, the magnetizing current freewheels through the LED, the LED is driven to give out the light, the LED can be an optical coupling LED, in this way, a user is reminded that the ESR of a filtering capacitor rises and a failure risk of the ripple current generating circuit exists, so that damage is prevented from expanding. The ripple current generating method and circuit have the advantages of being low in cost and energy consumption and easy to carry out.
Description
Technical field
The present invention relates to a kind of ripple current and produce circuit, ripple current during particularly to the burn-in test of electrochemical capacitor life produces circuit.
Background technology
At present, Switching Power Supply application is very wide, for input power at below 75W, to power factor (PF) (PF, PowerFactor, also referred to as power factor) occasion that is not required, inverse-excitation type (Fly-back) Switching Power Supply has charming advantage, these two parts of titles in China application number 201510753470.X and 201510753730.8 are in the application of " a kind of ripple current production method and circuit " all introduction, also describe currently without effective method of testing simultaneously, instrument carrys out management and control electrochemical capacitor rated ripple current, and give technical scheme a kind of ripple current production method and circuit are provided, low cost, low energy consumption ground provides high frequency ripple current to test electrochemical capacitor. in order to convenient, " electrochemical capacitor " is below all referred to as " electrolysis ".
Above-mentioned two parts of patent applications are briefly referred to as by the order occurred in this article: existing patent A (201510753470.X) and existing patent B (201510753730.8).
In existing patent A, DC source and inductance are responsible for power supply. One transformator, a diode, a field effect transistor, one control circuit for pulse-width modulation method according to claim constitutes the core main body of circuit, its effect is to produce ripple current, and the electric flux consumed when producing ripple current, DC source or tested electrochemical capacitor is almost nondestructively returned to, in order to convenient, this partial circuit producing ripple current and lossless return energy by the second winding, it is called lossless ripple current generator circuit, referred to as lossless ripple current generator.
In existing patent B, DC source and the first inductance are responsible for power supply. Second inductance, the first diode, the second diode, two field effect transistor, one control circuit for pulse-width modulation method according to claim constitutes the core main body of circuit, its effect is to produce ripple current, and the electric flux consumed when producing ripple current, DC source or tested electrochemical capacitor is almost nondestructively returned to by the second inductance, the first diode, the second diode, in order to convenient, this partial circuit producing ripple current and lossless return energy, also referred to as lossless ripple current generator circuit, equally referred to as lossless ripple current generator.
The scheme of above-mentioned two parts of patent applications still suffers from problem: when tested electrolysis was soon lost efficacy, equivalent series resistance (ESR, the abbreviation of EquivalentSeriesResistance) rise bigger time, the performance of electrolysis is close to non-serviceable edge, if at this moment not shutting down, electrolysis is in acceleration failure mode, and electrolysis was once lose efficacy, electrolyte is likely to demolition, in electrolysis, electrolyte is so fried that to be everywhere, cleaning difficulty, a lot of related inefficacy will be caused, so that lose extended, as field effect transistor Q demolishs, cause shade at heart also to the operator of testing equipment, dare not operate the computer.
Existing solution is: when being tested to the regular hour, just electrolysis is removed, and with its ESR of LCR bridge measurement, if value has exceeded the high limit on technical manual, just stops test. This method there is also problem: complicated operation, and there is shutdown centre, and the life-span of electrolysis can not be detected truly, after again electrolysis being installed, before next time point arrives, it would still be possible to there is electrolysis demolition, cause a lot of related inefficacy.
So, it is intended that there is a kind of ripple current to produce circuit, it is possible to when the ESR rise of tested electrolysis is to certain value, it is provided that an indication signal, to shut down in time for equipment or operator.
Summary of the invention
In view of this; the invention solves the problems that the deficiency of existing ripple current production method and circuit; a kind of ripple current is provided to produce circuit; it is possible not only to low cost, provides high frequency ripple current to low energy consumption; and can when the ESR rise of tested electrolysis to certain value; one indication signal is provided, shuts down in time for test equipment or operator.
A kind of ripple current production method provided by the invention and circuit, including DC source, the first inductance, a lossless ripple current generator, and connect the lead-out terminal of two pins of measured capacitance, including plus end and negative terminal, the output of described DC source has positive pole and negative pole, and described lossless ripple current generator at least includes a control circuit for pulse-width modulation;
Described lead-out terminal and described inductance are in parallel with described DC source after connecting;
Described lossless ripple current generator and described lead-out terminal are in parallel, be used for producing ripple current, and the electric flux consumed when producing ripple current is nondestructively returned to DC source;
The maximum duty cycle of described control circuit for pulse-width modulation is less than 0.5;
Also include a luminous organ, it is characterized in that: luminous organ has two terminals, there is the performance of unilateal conduction, described luminous organ and the first described inductance in parallel, and guarantee that described DC source is contrary with the conducting direction of described luminous organ by the sense of current of the first described inductance supplying power for outside; The freewheel current of described lossless ripple current generator returns directly to described DC source.
Preferably, described luminous organ is light emitting diode;
Preferably, described luminous organ is a light emitting diode and a diode series aiding connection;
Preferably, described luminous organ is a light emitting diode, a diode and the first resistance series aiding connection;
Preferably, described luminous organ includes a light emitting diode, diode, first resistance, also includes the first electric capacity, and its annexation is: light emitting diode and after resistant series with the first Capacitance parallel connection, the first network formed after parallel connection again with diode series aiding connection, and form luminous organ;
Preferably, also include the second resistance, described light emitting diode two ends the second resistance in parallel;
Preferably, in above-mentioned all schemes, also including the second electric capacity, the second electric capacity is in parallel with described DC source.
Preferably, in above-mentioned scheme, it is characterized in that: described light emitting diode is the luminous organ in optocoupler, i.e. light emitting diode in optocoupler.
Operation principle will in conjunction with the embodiments, is explained in detail.
The invention have the benefit that
Low cost, low energy consumption ground provide high frequency ripple current;
Before electrochemical capacitor lost efficacy, the lumination of light emitting diode in this luminous organ or the light emitting diode in optocoupler have electric current to flow through, and optocoupler exports the signal of an isolation to point out user or circuit, and the default ESR before electrochemical capacitor inefficacy is adjustable in.
Accompanying drawing explanation
Fig. 1-1 is technical solution of the present invention first embodiment schematic diagram;
Fig. 1-2 is the schematic diagram of technical solution of the present invention first embodiment another kind implementation;
Fig. 2-1 is technical solution of the present invention the second embodiment schematic diagram;
Fig. 2-2 is the schematic diagram of technical solution of the present invention the second embodiment another kind implementation;
Fig. 3-1 is the embodiment of technical solution of the present invention luminous organ, and postponing is the 3rd embodiment;
Fig. 3-2 is the schematic diagram of the another kind of implementation of the embodiment three of technical solution of the present invention luminous organ;
Fig. 4 is the embodiment of technical solution of the present invention luminous organ, and postponing is the 4th embodiment;
Fig. 5-1 is the embodiment of technical solution of the present invention luminous organ, and postponing is the 5th embodiment;
The schematic diagram of the another kind of implementation of the embodiment five of Fig. 5-2 technical solution of the present invention luminous organ.
Detailed description of the invention
First embodiment
Ask for an interview Fig. 1-1, a kind of ripple current production method and circuit, including DC source U, first inductance L, 100 it is lossless ripple current generator, and the lead-out terminal of connection two pins of measured capacitance, including plus end J+ and negative terminal J-, the output of DC source U has positive pole and negative pole, lossless ripple current generator 100 at least includes a control circuit for pulse-width modulation P
Lead-out terminal and inductance L are in parallel with DC source U after connecting;
Lossless ripple current generator 100 and described lead-out terminal are in parallel;
The maximum duty cycle of control circuit for pulse-width modulation P is less than 0.5;
Also include a luminous organ 200, it is characterized in that: luminous organ 200 has two terminals, it it is a LED, there is the performance of unilateal conduction, LED is in parallel with inductance L, and it is in opposite direction with the forward conduction of LED by the sense of current of inductance L supplying power for outside to meet DC source U, the freewheel current of lossless ripple current generator 100 returns directly to DC source.
LED adopts Φ 3mm red highlighted, and in order to convenient, light emitting diode is referred to as luminous tube, model is 3AR2UD, lossless ripple current generator 100 adopts the technical scheme of first embodiment in existing patent A, the inductance of inductance L value 1mH, adopts wire diameter 0.6mm coiling.
In Fig. 1-1, second winding of transformator T and diode D1 series connection, the freewheel current of second winding of transformator T is returned directly to DC source, it is connected as: the different name end of second winding of transformator T is connected on the positive pole of DC source U, the Same Name of Ends of second winding of transformator T connects the negative electrode of diode D1, and the anode of diode D1 is connected on the negative pole of DC source U.
The another kind of connected mode freewheel current also or to realize lossless ripple current generator 100 returns directly to DC source. This absolutely proves at existing patent A, i.e. second winding of transformator T and diode D1 transposition, it is connected as: the different name end of second winding of transformator T connects the anode of diode D1, the negative electrode of diode D1 is connected on the positive pole of DC source U, and the Same Name of Ends of second winding of transformator T connects on the negative pole of DC source U.
Measured capacitance is for being nominally the electrochemical capacitor of 450BXC47MEFC18 × 25, nominal is pressure 450V, ripple current is 1.2A, DC source U is adjusted to 311V direct current, after the circuit of first embodiment is put up, regulate the size of gaps of magnetic core so that the ripple current of measured capacitance is 1.2A, and now LED is not luminous.
Electrochemical capacitor owing to losing efficacy is difficult to find, in above-mentioned measured capacitance, seal in adjustable resistance, carry out the electrochemical capacitor that simulated performance has declined, the adjustable extent here of adjustable resistance is 0-39 Ω, when the resistance of adjustable resistance is transferred to 5 Ω, about 0.5 Ω when being equivalent to the ESR of electrochemical capacitor of 47uF/400V from non-defective unit has risen to 5.5 Ω, and the performance of electrochemical capacitor is close to non-serviceable edge.
Now, the luminous tube LED in Fig. 1-1 is luminous, and the meansigma methods actual measurement of operating current is 0.6mA. By choosing the inductance L of different sensibility reciprocal, the preliminary sensitivity regulating instruction, the sensibility reciprocal of inductance L is little, and sensitivity is low; The sensibility reciprocal of inductance L is big, but the former limit inductance value less than transformator T, highly sensitive.
Owing to luminous tube is when luminescence, there is the forward voltage drop of 1.6V to 2.2V, sensitivity can be regulated completely in luminous tube LED two ends parallel resistance, as in this example, if the resistance of 1.6K in parallel, so, the voltage that the electric current of below 1mA produces at resistance two ends in parallel is at below 1.6V, and at this moment luminous tube LED is not luminous.
Operation principle:
Work as measured capacitance, here for electrolysis normal time, owing to its ESR is less, the ripple current that lossless ripple current generator 100 produces substantially is absorbed by measured capacitance, the electric current flow through in inductance L is DC current, when switching tube Q saturation conduction and excitatory time, exciting curent in inductance L is minimum, it is considered as being absent from, the electric current flow through in inductance L is DC current, it it is the DC source U electric current to measured capacitance electric energy supplement, flowed to the left end of inductance L through inductance from the right-hand member of inductance L, return to the negative pole of DC source U, in the drawings, it it is exactly the sense of current from right to left, so luminous organ, namely the LED conducting direction in Fig. 1-1 is contrary by the sense of current of inductance L supplying power for outside with DC source U, namely LED conducting direction is from left to right, LED is not luminous.
When tested electrolysis is abnormal, namely ESR is substantially increased, the ripple current that lossless ripple current generator 100 produces can not be absorbed by measured capacitance, when switching tube Q saturation conduction and excitatory time, measured capacitance exists bigger ESR, also to first winding of transformator T in inductance L, namely former limit inductance provides exciting curent, when switching tube Q ends, owing to the exciting curent in inductance L can not suddenly change, and this electric current cannot be fully absorbed by tested electrolysis, because the ESR of tested electrolysis becomes big, electric current always finds shorter path flowing, this electric current is exactly the anode through LED, negative electrode to LED, it is then return to the other end of inductance L, in Fig. 1-1, for that one end that the positive pole of inductance L with DC source U is connected, the i.e. left end of inductance L, light LED.
The electric current of the second winding afterflow of transformator T, after DC source U filters, smooths through inductance L, with DC current, measured capacitance is charged, thus obtain and be charged as DC current, discharges and discharges for high frequency ripple current.
If DC source directly being changed into alternating current power supply after rectification circuit, it is possible to directly imitate out real electrochemical capacitor and use environment: be namely charged as low frequency pulsating DC current, discharging and discharging for high frequency ripple current.
Note: the conduction voltage drop of white-light emitting pipe is about 3.0V, red and green is also different, and the luminous organ conduction voltage drop within optocoupler is about 1.1V.
So, electrochemical capacitor is after hydraulic performance decline, and luminous tube LED can be luminous, illustrates that the electric current of LED flows to negative electrode from LED anode, namely in Fig. 1-1, there is an electric current and flowed to the right-hand member of inductance L from the left end of inductance L through luminous tube LED.
Note: herein before, when those skilled in the art thinks that the ESR rise of electrochemical capacitor is to inefficacy edge, still have filter action, can not there is the such circuit of left end flowing to inductance L from the right-hand member of inductance L through luminous tube LED, ignoring the master power switch pipe Q freewheel current become in the moment inductance L ended from conducting and can produce this very hidden factor of voltage drop on ESR, the present inventor utilizes this voltage drop to drive LED as display lamp.And those skilled in the art to realize the purpose of the present invention before the application, the on-line checking circuit that must adopt complexity could realize, and necessarily causes the defects such as product efficiency decline, volume increase and cost raising after such technical scheme insertion switch power supply.
Fig. 1-2 is the schematic diagram of technical solution of the present invention first embodiment another kind implementation, also fully meets annexation and the method for technical scheme, realizes goal of the invention equally.
The operation principle of Fig. 1-2:
When measured capacitance is normal, owing to its ESR is less, the ripple current that lossless ripple current generator 100 produces substantially is absorbed by measured capacitance, the electric current flow through in inductance L is DC current, when switching tube Q saturation conduction and excitatory time, exciting curent in inductance L is minimum, it is considered as being absent from, the electric current flow through in inductance L is DC current, it it is the DC source U electric current to measured capacitance electric energy supplement, flowed to the right-hand member of inductance L through inductance from the left end of inductance L, return to the negative pole of DC source U, in the drawings, it it is exactly the sense of current from left to right, so luminous organ, namely the LED conducting direction in Fig. 1-2 is contrary by the sense of current of inductance L supplying power for outside with DC source U, namely LED conducting direction is from right to left, LED is not luminous.
When tested electrolysis is abnormal, namely ESR is substantially increased, the ripple current that lossless ripple current generator 100 produces can not be absorbed by measured capacitance, when switching tube Q saturation conduction and excitatory time, measured capacitance exists bigger ESR, also providing exciting curent to the former limit inductance of transformator T in inductance L, this electric current is identical with DC current direction, for the sense of current from left to right; When switching tube Q ends, owing to the exciting curent in inductance L can not suddenly change, and this electric current cannot be fully absorbed by tested electrolysis, because the ESR of tested electrolysis becomes big, electric current always finds shorter path flowing, this electric current is exactly the anode through LED, negative electrode to LED, it is then return to the other end of inductance L, in Fig. 1-2, for that one end that the positive pole of inductance L with DC source U is connected, the i.e. left end of inductance L, light LED, namely in Fig. 1-2, there is an electric current and flowed to the left end of inductance L from the right-hand member of inductance L through luminous tube LED.
First embodiment adopts the lossless ripple current generator in existing patent B equally can work, here it is the second embodiment, as described below.
Second embodiment
Ask for an interview Fig. 2-1, a kind of ripple current production method and circuit, including DC source U, the first inductance L, 100 be lossless ripple current generator, and connect the lead-out terminal of two pins of measured capacitance, including plus end J+ and negative terminal J-; The output of DC source U has positive pole and negative pole, and lossless ripple current generator 100 at least includes a control circuit for pulse-width modulation P,
Lead-out terminal and inductance L are in parallel with DC source U after connecting;
Lossless ripple current generator 100 and described lead-out terminal are in parallel;
The maximum duty cycle of control circuit for pulse-width modulation P is less than 0.5;
Also include a luminous organ 200, it is characterized in that: luminous organ 200 has two terminals, it it is a LED, there is the performance of unilateal conduction, LED is in parallel with inductance L, and it is in opposite direction with the forward conduction of LED by the sense of current of inductance L supplying power for outside to meet DC source U, the freewheel current of lossless ripple current generator 100 returns directly to DC source.
LED adopts the red highlighted common model of Φ 5mm, and lossless ripple current generator 100 adopts the technical scheme of first embodiment in existing patent B, the inductance of inductance L value 1mH, adopts wire diameter 0.6mm coiling.Inductance L2 is the power inductance of about 1.3mH, and air gap is adjustable.
In Fig. 2-1, the annexation of inductance L2 and diode D1, D2 etc.: two field effect transistor, upper pipe Q1, the drain electrode of lower pipe Q2, upper pipe Q1 connects plus end J+, and the source electrode of upper pipe Q1 connects one end of the second inductance L2, in Fig. 2-1,1 is marked, and junction point is simultaneously connected with the negative electrode of diode D2; The other end of the second inductance L2, in Fig. 2-1,2 are marked, and connect the drain electrode of lower pipe Q2, and junction point is simultaneously connected with the anode of the first diode D1; The negative electrode of diode D1 connects the positive pole of DC source U, and the anode of diode D2 connects the negative pole of DC source U. The freewheel current realizing lossless ripple current generator 100 returns directly to DC source.
Measured capacitance is for being nominally the electrochemical capacitor of 450BXC47MEFC18 × 25, nominal is pressure 450V, ripple current is 1.2A, DC source U is adjusted to 420V direct current, after the circuit of the second embodiment is put up, regulate the size of gaps of magnetic core so that the ripple current of measured capacitance is 1.2A, and now LED is not luminous.
Electrochemical capacitor owing to losing efficacy is difficult to find, in measured capacitance, still seal in adjustable resistance, carry out the electrochemical capacitor that simulated performance has declined, adjustable resistance adjustable extent here is 0-39 Ω, when the resistance of adjustable resistance is transferred to 4.5 Ω, about 0.5 Ω when being equivalent to the ESR of electrochemical capacitor of 47uF/400V from non-defective unit has risen to 5 Ω, and the performance of electrochemical capacitor is close to non-serviceable edge.
Now, the luminous tube LED in Fig. 2-1 is luminous, and the meansigma methods actual measurement of operating current is 0.9mA. By choosing the inductance L of different sensibility reciprocal, the preliminary sensitivity regulating instruction, the sensibility reciprocal of inductance L is little, and sensitivity is low; The sensibility reciprocal of inductance L is big, but the inductance value less than inductance L2, highly sensitive.
Operation principle:
Work as measured capacitance, here for electrolysis normal time, owing to its ESR is less, the ripple current that lossless ripple current generator 100 produces substantially is absorbed by measured capacitance, and the electric current flow through in inductance L is DC current, when switching tube Q1 and Q2 simultaneously saturation conduction and to inductance L2 excitatory time, exciting curent in inductance L is minimum, being considered as being absent from, the electric current flow through in inductance L is DC current, is the DC source U electric current to measured capacitance electric energy supplement. The DC current of electric energy supplement has flowed to the right-hand member of inductance L from the left end of inductance L through inductance, in Figure 2-1, it it is exactly the sense of current from left to right, so luminous organ, namely the LED conducting direction in Fig. 2-1 is contrary by the sense of current of inductance L supplying power for outside with DC source U, namely LED conducting direction is from right to left, and LED is not luminous.
When tested electrolysis is abnormal, namely ESR is substantially increased, the ripple current that lossless ripple current generator 100 produces can not be absorbed by measured capacitance, when switching tube Q1 and Q2 simultaneously saturation conduction and excitatory time, measured capacitance exists bigger ESR, inductance L also provides exciting curent to inductance L2, when switching tube Q1 and Q2 ends simultaneously, owing to the exciting curent in inductance L can not suddenly change, and this electric current cannot be fully absorbed by tested electrolysis, because the ESR of tested electrolysis becomes big, electric current always finds shorter path flowing, this electric current is exactly the anode through LED, negative electrode to LED, it is then return to the other end of inductance L, in Figure 2-1, for that one end that the positive pole of inductance L with DC source U is connected, the i.e. left end of inductance L, light LED.
So, electrochemical capacitor is after hydraulic performance decline, and luminous tube LED can be luminous, illustrates that the electric current of LED flows to negative electrode from LED anode, namely in Figure 2-1, there is an electric current and flowed to the left end of inductance L from the right-hand member of inductance L through luminous tube LED.
Another way in parallel with described DC source after described lead-out terminal and the series connection of described inductance, Fig. 2-2 just shows this mode of the second embodiment, also fully meets annexation and the method for technical scheme, realizes goal of the invention equally.
First embodiment and the second embodiment achieve low cost, provide high frequency ripple current to low energy consumption; charging and discharging to electrolysis is all high frequency electric; and it is identical with the current shape in actually used; and can when the ESR rise of tested electrolysis to certain value; one indication signal is provided, shuts down in time for test equipment or operator.
See Fig. 1-1 or Fig. 1-2 or Fig. 2-1 or Fig. 2-2, at powered on moment, DC source U is in high pressure conditions, owing to the terminal voltage of measured capacitance CL is zero, and the terminal voltage of electric capacity can not suddenly change, and the electric current in inductance L is zero, and the electric current in inductance can not suddenly change, at this moment, powered on moment, the voltage of DC source U major part can be added to luminous tube LED two ends, thus reverse breakdown luminous tube LED, the pressure nominal value of luminous tube LED generally only has about 5V to 10V, actual measurement is at about 35V, about 170V can accomplish in minority producer, but still the high pressure of DC source U cannot be born, the embodiment of the luminous organ being illustrated below solves this problem, in order to convenient, postponing is the 3rd embodiment.
3rd embodiment
Ask for an interview Fig. 3-1, luminous organ 200 is a LED and a diode D series aiding connection, understand in order to convenient, figure has drawn inductance L, its annexation is: the first diode D and the first LED series aiding connection also form two-terminal network, two-terminal network and inductance L are in parallel, to guarantee that described DC source is contrary with the conducting direction of described luminous organ by the sense of current of the first described inductance supplying power for outside time in parallel.
Two-terminal network: refer to one or interconnected, by two and above components and parts, the circuit structure with two terminals formed.
The anode of two-terminal network, negative electrode: have the two-terminal network of unilateal conduction performance, when anode voltage is higher than negative electrode, can produce electric current; When cathode voltage is higher than anode, it is impossible to produce electric current.
Series aiding connection: two and above two-terminal series network, at least two of which two-terminal network has unilateal conduction performance, and still has unilateal conduction performance after each two-terminal series network. Each two-terminal network site in the application can permutation and combination, embodiment and accompanying drawing do not enumerate, and various permutation and combination belong to the protection domain of the application. The series aiding connection of the present embodiment: diode has unilateal conduction characteristic, refer to that the negative electrode of wherein and the positive level of another connect, so, two-terminal network after series connection, still having unilateal conduction performance, simply conduction voltage drop is two original sums, this series connection, two diode transpositions, still have unilateal conduction performance. Pressure is but two pressure sums of diode. Fig. 3-2 illustrates the another way of series connection.
First diode D selects the diode of the pressure high pressure maximum exceeding DC source U, it is considered to forward conduction is to be operated under the high frequency of Switching Power Supply, can be selected for fast-recovery commutation diode, such as 1N4007, pressure for 1000V;Or SF106, pressure for 400V. After sealing in, when powering on, the two ends of the first diode D bearing high pressure, the high pressure of reverse breakdown luminous tube LED is shared, and the first diode D plays a protective role.
When the power of lossless ripple current generator 100 is relatively larger, or running voltage relatively low time, the ripple current that main power stage produces is bigger, at this moment, the freewheel current lighting luminous organ is likely to excessive, and the maximum electric current that bears of the luminous organ in common luminescent pipe and optocoupler is general all at about 50mA, it is easy to damaging, the 4th embodiment solves this problem.
4th embodiment
Asking for an interview Fig. 4, on the basis of the 3rd embodiment, also include the first resistance R, luminous organ 200 is a LED, a diode D and the first resistance R series aiding connection; Understand in order to convenient, figure has drawn inductance L, its annexation is: the first diode D, the first LED and the first resistance R series aiding connection also form new network, new network and the first inductance L are in parallel, to guarantee that described DC source is contrary with the conducting direction of described luminous organ by the sense of current of the first described inductance supplying power for outside time in parallel.
Three devices in series, are still to realize unilateal conduction characteristic, and the mode of series connection has 6 kinds by the method for permutation and combination, does not illustrate one by one here.
4th embodiment loads in Switching Power Supply, realizes goal of the invention equally. Owing to there is current-limiting resistance R, when lossless ripple current generator 100 power is relatively larger, or running voltage relatively low time, the exciting curent of main power stage is bigger, at this moment, if not having current-limiting resistance R, the maximum electric current that bears of the luminous organ in common luminescent pipe and optocoupler is generally all at about 50mA, being easily damaged, the current-limiting resistance R in the 4th embodiment solves this problem.
Due to the generation of lossless ripple current generator 100 is high frequency ripple, this electric current yet just determined when luminous tube LED is lit is not unidirectional current, but high frequency electric, causing damage easily to the luminous organ that can only operate in low-frequency light emitting diode or optocoupler, the 5th embodiment illustrates the solution of luminous organ.
5th embodiment
Ask for an interview Fig. 5-1, luminous organ includes a LED, diode D, a first resistance R, also include the first electric capacity C1, its annexation is: after LED and resistance R connect, first is in parallel with electric capacity C1, the first network formed after parallel connection again with diode D series aiding connection, and form luminous organ 200;
Therefore first network is: in parallel with electric capacity C1 after luminous tube LED and resistance R series connection, owing to electric capacity is stopping direct current, logical exchange, so, first network is under direct current, still having the feature of unilateal conduction, one end that DC current can flow out is negative electrode, and one end that DC current can flow into or flow to is anode. So, all right understand first network again with diode D series aiding connection, namely to ensure series connection after still there is unilateal conduction performance. To guarantee when luminous organ is with inductance L parallel connection that described DC source is contrary by the sense of current of the first described inductance supplying power for outside and the conducting direction of described luminous organ.
5th embodiment has four kinds of connections, all can realize goal of the invention, Fig. 5-2 illustrate another kind of first network again with the circuit of diode D series aiding connection; First LED and the first resistance R series connection also have two kinds of methods. Here do not illustrate one by one.
After the luminous organ of the 5th embodiment loads circuit, freewheel current first filters through electric capacity C1, power to LED then through current-limiting resistance R, such LED obtains smooth unidirectional current, and luminous tube LED can be stably luminous, it does not have high frequency electric composition, if LED cabling is longer, cabling would not cause high frequency electric to space radiation, thus also improving the radiation disturbance degree of the present invention, reduces EMI.
When luminous tube LED being changed into the luminous organ in optocoupler, the output electric current of optocoupler is also stable signal, cause trouble will not to follow-up circuit, when the colelctor electrode of the outfan of optocoupler connects pull-up resistor, when electrochemical capacitor CL is close to non-serviceable edge, the colelctor electrode of the outfan of optocoupler can output low level; When the emitter stage of the outfan of optocoupler connects pull down resistor, when measured capacitance is close to non-serviceable edge, the emitter stage of the outfan of optocoupler can export high level; Notify that follow-up smart circuit makes action, as sent warning, or automatically switch to another way switch power supply, or it is shown on screen, the size of electric current can also be exported according to the outfan of optocoupler, provide the duration that Switching Power Supply lost efficacy, thus reminding the further prioritizing selection best solution of user.
Or retaining luminous tube LED, second network in parallel again at the two ends of filter capacitor C1, the second network is composed in series by the luminous organ LED2 in the second resistance and optocoupler, so, both can realize light and remind, it is possible to realize the output of high or low level.
Visible, the 3rd embodiment, the 4th embodiment, the 5th embodiment luminous organ access the present invention circuit in, realize goal of the invention equally.
First embodiment is to the 5th embodiment, if a DC source two ends high frequency capacitance C in parallel, as shown in figs. 1-2, when the electric flux consumed when lossless ripple current generator 100 produces ripple current nondestructively returns to DC source U, also it is that high frequency stricture of vagina is little, after high frequency capacitance C filters, return DC source U, it is possible to improve the EMI performance of the present invention.
Below it is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred implementation is not construed as limitation of the present invention. For those skilled in the art; without departing from the spirit and scope of the present invention; some improvements and modifications can also be made; as also sealed in resistance in the first diode; these improvements and modifications also should be regarded as protection scope of the present invention; here no longer repeating by embodiment, protection scope of the present invention should be as the criterion with claim limited range.
Claims (8)
1. a ripple current production method and circuit, including DC source, the first inductance, a lossless ripple current generator, and connect the lead-out terminal of two pins of measured capacitance, including plus end and negative terminal, the output of described DC source has positive pole and negative pole, and described lossless ripple current generator at least includes a control circuit for pulse-width modulation;
Described lead-out terminal and described inductance are in parallel with described DC source after connecting;
Described lossless ripple current generator and described lead-out terminal are in parallel, be used for producing ripple current, and the electric flux consumed when producing ripple current is nondestructively returned to DC source;
The maximum duty cycle of described control circuit for pulse-width modulation is less than 0.5;
Also include a luminous organ, it is characterized in that: luminous organ has two terminals, there is the performance of unilateal conduction, described luminous organ and the first described inductance in parallel, and guarantee that described DC source is contrary with the conducting direction of described luminous organ by the sense of current of the first described inductance supplying power for outside; The freewheel current of described lossless ripple current generator returns directly to described DC source.
2. ripple current according to claim 1 produces circuit, it is characterised in that: described luminous organ is light emitting diode.
3. ripple current according to claim 1 produces circuit, it is characterised in that: described luminous organ is a light emitting diode and a diode series aiding connection.
4. ripple current according to claim 1 produces circuit, it is characterised in that: described luminous organ is a light emitting diode, a diode and the first resistance series aiding connection.
5. ripple current according to claim 1 produces circuit, it is characterized in that: described luminous organ includes a light emitting diode, diode, first resistance, also include the first electric capacity, its annexation is: described light emitting diode and after described resistant series with the first described Capacitance parallel connection, after parallel connection formed first network again with described diode series aiding connection.
6. the ripple current according to any one of claim 2 to 5 produces circuit, it is characterised in that: also include the second resistance, described the second resistance described in the parallel connection of light emitting diode two ends.
7. the ripple current according to any one of claim 2 to 5 produces circuit, it is characterised in that: also including the second electric capacity, the second described electric capacity is in parallel with described DC source.
8. the ripple current according to any one of claim 2 to 5 produces circuit, it is characterised in that: described light emitting diode is the luminous organ in optocoupler.
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