CN205336590U - Self -adaptation current control circuit - Google Patents
Self -adaptation current control circuit Download PDFInfo
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- CN205336590U CN205336590U CN201620011483.XU CN201620011483U CN205336590U CN 205336590 U CN205336590 U CN 205336590U CN 201620011483 U CN201620011483 U CN 201620011483U CN 205336590 U CN205336590 U CN 205336590U
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Abstract
The utility model provides a self -adaptation current control circuit, includes: compensating pipe, first sampling comparison circuit, proportional control circuit, variable sampling resistor, second sampling comparison circuit, self -adaptation current control circuit passes through the proportional control circuit and adjusts the resistance of variable sampling resistor and the coefficient of ratio circuit simultaneously. Simultaneously the coefficient of variable sampling resistor and ratio circuit amplifies or dwindles with the proportion, makes second sampling comparison circuit's input voltage be in suitable input gap.
Description
Technical field
This utility model relates to circuit engineering field, particularly to a kind of self-adaptive current control circuit。
Background technology
Current source can provide at the DC current of certain amplitude stability to load, and therefore, the application of current source is very extensive, particularly very many for electrical domain in LED。AC network power is directly converted to the dc power with Sinusoidal Ripple and exports by DC source more at present, when being carried in LED, shows as the DC current with Sinusoidal Ripple。
But in actual applications, load often require that filter this electric current with Sinusoidal Ripple, therefore generally adopt current source filter circuit constant current control circuit carry out stabling current。Refer to Fig. 1, schematic diagram for existing constant current control circuit, including: current source 1, filter capacitor 2 and LED load 3, described LED load 3 connects adjustment pipe 4, the source class of described adjustment pipe 4 connects sampling resistor 5, the outfan controlling pole concatenation operation amplifier 6 of described adjustment pipe 4, when the output of described current source 1 has certain fluctuation, described operational amplifier 6 is by the voltage signal on relatively described sampling resistor 5 and can adaptive reference voltage signal Vref, controlling described adjustment pipe 4 makes the electric current of described LED load be close to constant current, and equal to input current。But traditional constant current control circuit with current source filter circuit, current source 1 export electric current bigger or less time, the input voltage value of operational amplifier 6 can exceed the input range that it is suitable, causes that its applicable current range is narrow。
Utility model content
This utility model provides a kind of self-adaptive current control circuit, by automatically adjusting the resistance of variable sampling resistance, makes the input voltage of operational amplifier in its suitable input range, thus compatible larger range of load current。
For solving the problems referred to above, this utility model embodiment provides a kind of self-adaptive current control circuit, including: adjust pipe, the first sampling comparison circuit, proportional control circuit, variable sampling resistance, the second sampling comparison circuit,
The described pipe that adjusts forms series circuit with variable sampling resistance, and one end of described series circuit is connected with current input terminal, and the other end is connected with current output terminal；
Described first sampling comparison circuit the first sampled signal of exchanging homogeneous tube corresponding is sampled, and with first, first sampled signal is set threshold value and compares, after integration, produce first integral signal, and first integral signal produces command signal through ratio circuit；
Described proportional control circuit sets threshold value according to the command signal obtained and second and compares generation the first control signal, utilizing the first control signal that the resistance of variable sampling resistance and the coefficient of ratio circuit are adjusted, the ratio that the ratio that variable sampling resistance zooms in or out zooms in or out with the coefficient of ratio circuit is consistent；
Described second sampling comparison circuit utilizes variable sampling resistance to obtain the second sampled signal, is compared and enlarged by the command signal of described second sampled signal Yu acquisition, produces the second control signal, utilizes the second control signal of output to control to adjust the electric current of pipe。
Optionally, described first sampling comparison circuit includes the first comparator, integrating circuit and ratio circuit, the first input end of described first comparator is exchanged homogeneous tube drain terminal voltage and is sampled, second input of described first comparator is the first setting threshold value, the described outfan of the first comparator is connected with the input of integrating circuit, the outfan of described integrating circuit is connected with the input of ratio circuit, the outfan of described ratio circuit is as the outfan of the first sampling comparison circuit, it is connected with the second sampling comparison circuit and proportional control circuit respectively, the coefficient control terminal of described ratio circuit is connected with proportional control circuit, the resistance of variable sampling resistance and the coefficient of ratio circuit zoom in or out in proportion。
Optionally, described integrating circuit is an electric capacity or digital integrator。
Optionally, described second sampling comparison circuit includes the first amplifier, the outfan of the first input end of described first amplifier and the first sampling comparison circuit is connected, second input of described first amplifier is connected with the sampling end of variable sampling resistance, and the outfan of described first amplifier is connected with the control end adjusting pipe。
Optionally, described second sets threshold value includes upper limit threshold voltage and lower threshold voltage, upper limit threshold voltage is more than lower threshold voltage, described proportional control circuit produces the first control signal according to upper limit threshold voltage, lower threshold voltage and command signal, the resistance of variable sampling resistance and the coefficient of ratio circuit are adjusted, and the ratio that the ratio that variable sampling resistance zooms in or out zooms in or out with the coefficient of ratio circuit is consistent。When command signal is higher than upper limit threshold voltage, the resistance of variable sampling resistance and the coefficient of ratio circuit reduce in proportion；When command signal is lower than lower threshold voltage, the resistance of variable sampling resistance and the coefficient of ratio circuit amplify in proportion。
Optionally, described proportional control circuit includes the second comparator, the 3rd comparator and proportion adjustment circuit, described second comparator, the 3rd comparator first input end respectively with first sample comparison circuit outfan be connected, second input of described second comparator is connected to upper limit threshold voltage, second input of described 3rd comparator is connected to lower threshold voltage, utilizes the second comparator, the 3rd comparator to control proportion adjustment circuit and exports the first control signal。
Optionally, the ratio that the first control signal of described proportion adjustment circuit output regulates is fixed proportion or non-fixed proportion。
Optionally, described first threshold value is set as fixed threshold or adaptive threshold。Optionally, when described first sets threshold value as adaptive threshold, threshold value is set according to the size adjustment of command signal first, it is ensured that adjust pipe and be operated in saturated working area。
Compared with prior art, the technical program has the advantage that
The resistance of variable sampling resistance and the coefficient of ratio circuit are adjusted by described self-adaptive current control circuit passing ratio control circuit in proportion, when prime input current increases, cause that command signal is more than the upper limit threshold in proportional control circuit, proportion adjustment circuit produces the first control signal, the resistance of variable sampling resistance and the coefficient of ratio circuit is made to reduce in proportion, make command signal between the upper lower threshold value of proportional control circuit, so that the input of the second sample circuit is in suitable scope, reduce sampling resistor loss simultaneously, improve system effectiveness；When prime input current reduces, cause that command signal is less than the lower threshold in proportional control circuit, proportion adjustment circuit produces the first control signal, the resistance of variable sampling resistance and the coefficient of ratio circuit is made to amplify in proportion, make command signal between the upper lower threshold value of proportional control circuit, make the input of the second sample circuit in suitable scope。
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the constant current control circuit of prior art；
Fig. 2 is the electrical block diagram of the self-adaptive current control circuit of one embodiment of this utility model；
Fig. 3 is the electrical block diagram of the self-adaptive current control circuit of another embodiment of this utility model；
Fig. 4 is the circuit diagram of the sampling resistor of one embodiment of this utility model；
Fig. 5 is that the waveform that fluctuates between upper limit threshold voltage and lower threshold voltage of this utility model embodiment control instruction signal is with reference to figure。
Detailed description of the invention
It has been found that the constant current control circuit of traditional current source active filter circuit, owing to the input voltage of operational amplifier has certain scope, cause that its applicable current range is narrow, and when prime input current is relatively larger, the power consumption of constant current control circuit is big, and efficiency is low。
Therefore, this utility model embodiment provides a kind of self-adaptive current control circuit, by dynamically regulating the resistance of variable sampling resistance, thus in bigger prime input current excursion, also can make the input voltage of operational amplifier in suitable scope, system high efficiency rate can be realized simultaneously。
Below in conjunction with accompanying drawing, by specific embodiment, the technical solution of the utility model is carried out clear, complete description。
Refer to Fig. 2, this utility model provides a kind of self-adaptive current control circuit, and the load that the current input terminal of described self-adaptive current control circuit or current output terminal are powered with DC source electrically connects。In the present embodiment, one end of described load 11 connects DC source 10, and the other end connects the current input terminal of described self-adaptive current control circuit, and described DC source 10 is parallel with filter capacitor and is filtered。In this utility model first embodiment, described self-adaptive current control circuit includes: adjust pipe T1, the first sampling comparison circuit 12, proportional control circuit 13, variable sampling resistance R1, the second sampling comparison circuit U2。
Described adjustment pipe T1 and sampling resistor R1 connects and forms series circuit, and one end of described series circuit is connected with current input terminal Iin, and the other end is connected with current output terminal Iout。The described pipe that adjusts is metal-oxide-semiconductor or audion, in the present embodiment, for metal-oxide-semiconductor。
In other embodiments, the position of described load 11 and adjustment pipe T1 can exchange。
Described first sampling comparison circuit 12 is exchanged the first corresponding for homogeneous tube T1 sampled signal and is sampled, first signal and first are set threshold value Vref compare and enlarge and after integration, producing first integral signal, first integral signal produces command signal through ratio circuit。
In the present embodiment, described first sampled signal is adjust the drain voltage of pipe。Refer to Fig. 3, described first sampled signal can also be the control pole tension adjusting pipe, i.e. grid voltage。
In other embodiments, when adjusting pipe for NPN audion, described first sampled signal is NPN transistor collector voltage。
In the present embodiment, described first sampling comparison circuit 12 includes the first comparator U1, integrating circuit I1 and ratio circuit P1, the first input end of described first comparator U1 is exchanged the drain voltage of homogeneous tube T1 and is sampled, second input of described first comparator U1 is the first setting threshold value Vref, the described outfan of the first comparator U1 is connected with the input of integrating circuit I1, the outfan of described integrating circuit I1 is connected with the input of ratio circuit P1, the outfan of described ratio circuit P1 is as the outfan of the first sampling comparison circuit 12, sample comparison circuit U2 respectively with second, proportional control circuit 13 is connected, the coefficient control terminal of described ratio circuit is connected with proportional control circuit, the coefficient making variable sampling resistance and ratio circuit zooms in or out in proportion。
The comparative result of the first comparator U1 is integrated by this utility model, is filtered out by the ripple entrained by input current source, it is achieved the effect of Constant Direct Current。After integration, and integral result is obtained command signal after ratio circuit zooms in or out, to adapt to different grids or drain voltage, such as sine etc.。
In other embodiments, the comparative result of the first comparator U1 is directly over ratio circuit and zooms in or out, obtain command signal。
In the present embodiment, described first sets threshold value Vref as fixed threshold, and when the first sampled signal is less than threshold voltage, command signal diminishes, and when the first sampled signal is more than threshold voltage, command signal becomes big。
In other embodiments, described first setting threshold value Vref can also be adaptive threshold, described adaptive threshold can with the change along with prime input current and change so that the drain terminal voltage adjusting pipe T1 all ensure that under different input currents adjustment pipe T1 works in saturated working area。In the present embodiment, described integrating circuit I1 is an electric capacity, and one end of described electric capacity is connected with the outfan of described first comparator U1, and other end ground connection utilizes described electric capacity that the comparative result of the first comparator U1 is integrated。
In other embodiments, described integrating circuit can also be other suitable integrating circuit such as digital integrator。
Described proportional control circuit 13, according to the command signal obtained, produces control signal, the resistance of variable sampling resistance R1 and the coefficient of ratio circuit P1 is adjusted in proportion, with the prime input current that compatibility is different。
Described proportional control circuit 13 sets threshold value according to the command signal obtained and second and compares generation the first control signal, and described second sets threshold value includes upper limit threshold voltage VHWith lower threshold voltage VL, upper limit threshold voltage VHMore than lower threshold voltage VL, utilize the first control signal that the resistance of variable sampling resistance and the coefficient of ratio circuit are zoomed in or out in proportion。In the present embodiment, the suitable upper limit input voltage of the corresponding second sampling comparison circuit of upper limit threshold；The suitable lower limit input voltage of the corresponding second sampling comparison circuit of lower threshold。
In the present embodiment, described proportional control circuit 13 includes the second comparator U3, the 3rd comparator U4 and proportion adjustment circuit C1, described second comparator U3, the 3rd comparator U4 first input end respectively with first sample comparison circuit 12 outfan be connected, second input of described second comparator U3 is connected to upper limit threshold voltage VH, second input of described 3rd comparator U4 is connected to lower threshold voltage VL, described second comparator U3, the 3rd comparator U4 outfan connect proportion adjustment circuit C1, proportion of utilization regulates the first control signal of circuit C1 output, regulates variable sampling resistance and ratio circuit respectively。In other embodiments, can also described second comparator U3, the 3rd comparator U4 outfan connect proportion adjustment circuit C1 and ratio circuit, proportion of utilization regulates the first control signal of circuit C1 output and regulates variable sampling resistance, and utilizes the comparative result control and regulation ratio circuit of the second comparator U3, the 3rd comparator U4。
In the present embodiment, refer to Fig. 4, described variable sampling resistance R1 is the parallel circuit that several resistor coupled in parallel are formed, and the circuit of each parallel connection is in series with a switching tube, and described proportional control circuit is connected with the control end of each switching tube respectively。
In other embodiments, described variable sampling resistance can also can pass through electric control for other and change variable resistor element or the variable resistance circuit etc. of resistance。Described variable resistor element can be pottery variable resistor element or oxide layer variable resistor element, described variable resistance circuit can also be the resistance of several series connection, each resistor coupled in parallel has a switching tube, and described proportional control circuit is connected with the control end of each switching tube respectively。
Described second sampling comparison circuit U2 utilizes variable sampling resistance to obtain the second sampled signal, is compared and enlarged by the command signal of described second sampled signal Yu acquisition, utilizes the second comparison signal of output to control to adjust the electric current of pipe。In the present embodiment, described second sampling comparison circuit U2 is the first amplifier, described first amplifier is difference amplifier, the outfan of the first input end of described first amplifier and the first sampling comparison circuit 12 is connected, second input of described first amplifier is connected with the sampling end of variable sampling resistance R1, the outfan of described first amplifier is connected with the control end adjusting pipe T1, realizes stablizing of load current by adjusting pipe T1, removes ripple。
In proportional control circuit 13, when command signal is positioned at upper limit threshold voltage VHWith lower threshold voltage VLBetween time, described proportion adjustment circuit C1 does not adjust the resistance of variable sampling resistance and the coefficient of ratio circuit。
When prime input current increases, cause that command signal is more than upper limit threshold voltage VHTime, namely command signal is more than the suitable upper limit input voltage of the second sampling comparison circuit, and the first control signal of described proportion adjustment circuit C1 output makes the resistance of variable sampling resistance and the coefficient of ratio circuit reduce in proportion, therefore, ohmically lower power consumption, system effectiveness also improves。Simultaneously because the voltage of the second sampled signal and command signal reduce in proportion, make the input voltage of the second sampling comparison circuit in suitable input range, it is ensured that its high accuracy work, and current feedback loop remains in that stable, adjusts tube current and remains unchanged。
When prime input current reduces, cause that command signal is less than lower threshold voltage VLTime, namely command signal is less than the suitable lower limit input voltage of the second sampling comparison circuit, first control signal of described proportion adjustment circuit C1 output makes the resistance of variable sampling resistance and the coefficient of ratio circuit raise in proportion, owing to input voltage (i.e. the second sampled signal) and the command signal of the first amplifier amplify in proportion, make the input voltage of the second sampling comparison circuit in suitable scope, it is ensured that its high accuracy work。Namely prime input current is less also can guarantee that the error of the second sampling comparison circuit is less, to improve input current ripple removal effect。
In the present embodiment, the described resistance of variable sampling resistance and the coefficient of ratio circuit zoom in or out in proportion, the coefficient that proportion adjustment circuit C1 adjusts every time is all constant, such as N times or 1/N times, when finding command signal still greater than upper limit threshold voltage or less than lower threshold voltage after once adjusting, continue to adjust, until command signal is between upper limit threshold voltage and lower threshold voltage。The waveform of prime input current and command signal is as shown in Figure 5。The suitable upper limit input voltage of described upper limit threshold voltage second sampling comparison circuit U2 corresponding to lower threshold voltage difference and suitable lower limit input voltage。By adjusting described upper limit threshold voltage and lower threshold voltage so that the input voltage of the second sampling comparison circuit U2 can maintain in a scope that can regulate in high precision。
In other embodiments, the coefficient that described proportion adjustment circuit C1 adjusts every time can also be non-constant。
Although this utility model is with preferred embodiment openly as above; but it is not for limiting this utility model; any those skilled in the art are without departing from spirit and scope of the present utility model; may be by the method for the disclosure above and technology contents and technical solutions of the utility model are made possible variation and amendment; therefore; every content without departing from technical solutions of the utility model; any simple modification, equivalent variations and modification above example made according to technical spirit of the present utility model, belongs to the protection domain of technical solutions of the utility model。
Claims (9)
1. a self-adaptive current control circuit, it is characterised in that including: adjustment is managed, the first sampling is more electric
Road, proportional control circuit, variable sampling resistance, the second sampling comparison circuit,
The described pipe that adjusts forms series circuit with variable sampling resistance, and one end of described series circuit is connected with current input terminal, and the other end is connected with current output terminal；
Described first sampling comparison circuit the first sampled signal of exchanging homogeneous tube corresponding is sampled, and with first, first sampled signal is set threshold value and compares, after integration, produce first integral signal, and first integral signal produces command signal through ratio circuit；
Described proportional control circuit sets threshold value according to the command signal obtained and second and compares generation the first control signal, utilizing the first control signal that the resistance of variable sampling resistance and the coefficient of ratio circuit are adjusted, the ratio that the ratio that variable sampling resistance zooms in or out zooms in or out with the coefficient of ratio circuit is consistent；
Described second sampling comparison circuit utilizes variable sampling resistance to obtain the second sampled signal, is compared and enlarged by the command signal of described second sampled signal Yu acquisition, produces the second control signal, utilizes the second control signal of output to control to adjust the electric current of pipe。
2. self-adaptive current control circuit as claimed in claim 1, it is characterized in that, described first sampling comparison circuit includes the first comparator, integrating circuit and ratio circuit, the first input end of described first comparator is exchanged homogeneous tube drain terminal voltage and is sampled, second input of described first comparator is the first setting threshold value, the described outfan of the first comparator is connected with the input of integrating circuit, the outfan of described integrating circuit is connected with the input of ratio circuit, the outfan of described ratio circuit is as the outfan of the first sampling comparison circuit, it is connected with the second sampling comparison circuit and proportional control circuit respectively, the coefficient control terminal of described ratio circuit is connected with proportional control circuit, the resistance of variable sampling resistance and the coefficient of ratio circuit zoom in or out in proportion。
3. self-adaptive current control circuit as claimed in claim 2, it is characterised in that described integrating circuit is an electric capacity or digital integrator。
4. self-adaptive current control circuit as claimed in claim 1, it is characterized in that, described second sampling comparison circuit includes the first amplifier, the outfan of the first input end of described first amplifier and the first sampling comparison circuit is connected, second input of described first amplifier is connected with the sampling end of variable sampling resistance, and the outfan of described first amplifier is connected with the control end adjusting pipe。
5. self-adaptive current control circuit as claimed in claim 1, it is characterized in that, described second sets threshold value includes upper limit threshold voltage and lower threshold voltage, upper limit threshold voltage is more than lower threshold voltage, described proportional control circuit is according to upper limit threshold voltage, lower threshold voltage and command signal produce the first control signal, the resistance of variable sampling resistance and the coefficient of ratio circuit are adjusted, the ratio that the ratio that variable sampling resistance zooms in or out zooms in or out with the coefficient of ratio circuit is consistent, when command signal is higher than upper limit threshold voltage, the resistance of variable sampling resistance and the coefficient of ratio circuit reduce in proportion；When command signal is lower than lower threshold voltage, the resistance of variable sampling resistance and the coefficient of ratio circuit amplify in proportion。
6. self-adaptive current control circuit as claimed in claim 5, it is characterized in that, described proportional control circuit includes the second comparator, the 3rd comparator and proportion adjustment circuit, described second comparator, the 3rd comparator first input end respectively with first sample comparison circuit outfan be connected, second input of described second comparator is connected to upper limit threshold voltage, second input of described 3rd comparator is connected to lower threshold voltage, utilizes the second comparator, the 3rd comparator to control proportion adjustment circuit and exports the first control signal。
7. self-adaptive current control circuit as claimed in claim 6, it is characterised in that the ratio that the first control signal of described proportion adjustment circuit output regulates is fixed proportion or non-fixed proportion。
8. self-adaptive current control circuit as claimed in claim 1, it is characterised in that described first sets threshold value as fixed threshold or adaptive threshold。
9. self-adaptive current control circuit as claimed in claim 1, it is characterised in that when described first sets threshold value as adaptive threshold, set threshold value according to the size adjustment of command signal first, it is ensured that adjust pipe and be operated in saturated working area。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620011483.XU CN205336590U (en) | 2016-01-05 | 2016-01-05 | Self -adaptation current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620011483.XU CN205336590U (en) | 2016-01-05 | 2016-01-05 | Self -adaptation current control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205336590U true CN205336590U (en) | 2016-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620011483.XU Withdrawn - After Issue CN205336590U (en) | 2016-01-05 | 2016-01-05 | Self -adaptation current control circuit |
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| CN (1) | CN205336590U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105491726A (en) * | 2016-01-05 | 2016-04-13 | 杰华特微电子（杭州）有限公司 | Self-adaptive current control circuit |
| CN109194315A (en) * | 2018-09-14 | 2019-01-11 | 国网河北省电力有限公司电力科学研究院 | data conversion device |
-
2016
- 2016-01-05 CN CN201620011483.XU patent/CN205336590U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105491726A (en) * | 2016-01-05 | 2016-04-13 | 杰华特微电子（杭州）有限公司 | Self-adaptive current control circuit |
| CN105491726B (en) * | 2016-01-05 | 2017-05-10 | 杰华特微电子（杭州）有限公司 | Self-adaptive current control circuit |
| CN109194315A (en) * | 2018-09-14 | 2019-01-11 | 国网河北省电力有限公司电力科学研究院 | data conversion device |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160622 Effective date of abandoning: 20170510 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160622 Effective date of abandoning: 20170510 |