CN103747599B - Current stabilization control circuit, corresponding electrical combination and current stabilization control method - Google Patents
Current stabilization control circuit, corresponding electrical combination and current stabilization control method Download PDFInfo
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- CN103747599B CN103747599B CN201410040888.1A CN201410040888A CN103747599B CN 103747599 B CN103747599 B CN 103747599B CN 201410040888 A CN201410040888 A CN 201410040888A CN 103747599 B CN103747599 B CN 103747599B
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Abstract
A kind of current stabilization control circuit, corresponding electrical combination and current stabilization control method, described current stabilization control circuit utilizes sampling comparison circuit first signal corresponding to load to sample, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal and setting threshold are compared, according to comparative result, regulate the Current Control benchmark of adaptation control circuit; And utilize adaptation control circuit to sample to load current, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.Utilize Current Control benchmark automatically can regulate the impedance magnitude of the first control switch, and then the load current flowing through load is stablized, ripple is less, and described current stabilization control circuit can also expansion in parallel simultaneously.
Description
Technical field
The present invention relates to current source technology field, particularly a kind of current stabilization control circuit, corresponding electrical combination and current stabilization control method.
Background technology
Current source can provide electric current to load, therefore the having wide range of applications of current source.Wherein, LED driver is exactly a kind of typical current source, and LED driver can provide the electric current of stable amplitude for one or more LED.
But when the speed of the current controlled circuit of LED driver is slower, or in the situations such as filter capacity is less, the amplitude of the output current of LED driver can fluctuate in certain scope, i.e. current ripples, when the electric current with ripple flows through LED, the brightness of LED can change along with ripple, namely produces stroboscopic phenomenon, and this stroboscopic phenomenon is unacceptable at some to the occasion that light source requirements is strict.
Summary of the invention
The problem that the present invention solves is to provide a kind of current stabilization control circuit, corresponding electrical combination and current stabilization control method, the electric current current stabilization that current source is exported.
For solving the problem, embodiments providing a kind of current stabilization control circuit, comprising: power supply source, the load be connected with power supply source, the adaptation control circuit be connected with load, the sampling comparison circuit that is connected with described adaptation control circuit; The first signal that described sampling comparison circuit is corresponding to load is sampled, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal and setting threshold are compared, according to comparative result, the Current Control benchmark of output adaptive control circuit; Described adaptation control circuit is sampled to load current, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.
Optionally, described comparison signal is the difference of the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or the minimum value maximum in a period of time in the first signal.
Optionally, described first signal is the pressure drop between load current, the voltage of load one end, the pressure drop of load, the voltage of first control switch one end or the first control switch source and drain.
Described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, one end of described first sample circuit is connected with adaptation control circuit, first signal corresponding to load is sampled, the other end of described first sample circuit is connected with the first input end of the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of the second comparison circuit, the Current Control benchmark of the output output adaptive control circuit of described second comparison circuit.
Optionally, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: counter, sliding window averaging unit, D/A converter, described counter, sliding window averaging unit, D/A converter connect successively, the output of the second comparison circuit is connected with counter, obtain corresponding voltage control benchmark by counter and sliding window averaging unit, and utilize the Current Control benchmark of the output output adaptive control circuit of described D/A converter.
Optionally, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: the first metal-oxide-semiconductor, second metal-oxide-semiconductor, pull-up current source, the drain electrode of described first metal-oxide-semiconductor and grid, the output of the second comparison circuit is connected, the grid of described first metal-oxide-semiconductor is connected with the grid of the second metal-oxide-semiconductor, the one termination operating voltage in described pull-up current source, the source electrode of described first metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor, the drain electrode of described second metal-oxide-semiconductor is connected with the other end in pull-up current source as the output of comparison circuit of sampling, the Current Control benchmark of output adaptive control circuit.
Optionally, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: the 3rd metal-oxide-semiconductor, 4th metal-oxide-semiconductor, 5th metal-oxide-semiconductor, 6th metal-oxide-semiconductor, 7th metal-oxide-semiconductor, 8th metal-oxide-semiconductor, described 3rd metal-oxide-semiconductor, 4th metal-oxide-semiconductor forms the first current mirror, described 5th metal-oxide-semiconductor, 6th metal-oxide-semiconductor forms the second current mirror, the output of described second comparison circuit and the 7th metal-oxide-semiconductor, the source electrode of the 8th metal-oxide-semiconductor, the drain electrode of described 7th metal-oxide-semiconductor and the drain electrode of the 5th metal-oxide-semiconductor, grid is connected, the drain electrode of described 8th metal-oxide-semiconductor and the drain electrode of the 3rd metal-oxide-semiconductor, grid is connected, the source electrode of described 3rd metal-oxide-semiconductor, the source ground of the 4th metal-oxide-semiconductor, described 5th metal-oxide-semiconductor, the source electrode of the 6th metal-oxide-semiconductor connects operating voltage, the drain electrode of described 4th metal-oxide-semiconductor, the drain electrode of the 6th metal-oxide-semiconductor is connected with the output of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
Optionally, when described first signal is load current, and described comparison signal is when being the difference of minimum value maximum in a period of time in the first signal, described sampling comparison circuit comprises: the 3rd comparison circuit, second control switch, second comparison circuit, the positive input of described 3rd comparison circuit is connected with the reverse input end of the second comparison circuit, and be connected with corresponding adaptation control circuit, the described reverse input end of the 3rd comparison circuit and one end of the second control switch, one end of first electric capacity is connected with the positive input of the second comparison circuit, the output of described 3rd comparison circuit is connected with the control end of the second control switch, the other end of described second control switch is connected with operating voltage, the other end ground connection of described first electric capacity, the output of described second comparison circuit is used for the Current Control benchmark of output adaptive control circuit.
Optionally, the output of described sampling comparison circuit is parallel with the first filter capacitor.
Optionally, described adaptation control circuit comprises: the first control switch, the first current sampling resistor, the first comparison circuit, one end of described first control switch is connected with corresponding load, the other end of described first control switch is connected with the first current sampling resistor, the first input end of described first comparison circuit is connected with the first current sampling resistor, second input input current of described first comparison circuit controls benchmark, and the output of described first comparison circuit is connected with the control end of the first control switch.
Optionally, described setting threshold is fixed threshold or variable thresholding.
Optionally, when described setting threshold is variable thresholding, setting threshold acquisition cuicuit comprises: Feedback Current Source, fixed bias, the 4th control switch, the second sampling resistor, described Feedback Current Source, fixed bias, the 4th control switch, the second sampling resistor connect successively, and the input of described Feedback Current Source obtains load current, described fixed bias or the 4th control switch wherein one end are connected with the second input of the second comparison circuit as output; Described Feedback Current Source produces corresponding proportional electric current according to load current; First control switch, first current sampling resistor of described 4th control switch, the second sampling resistor structure and adaptation control circuit are corresponding proportional respectively.
Optionally, described variable thresholding changes with the change of load current, the first control switch characteristic or temperature.
Optionally, a load correspondence has one or more adaptation control circuit be connected with load and comparison circuit of sampling.
The embodiment of the present invention additionally provides the combination of a kind of current stabilization control circuit, comprising: the current stabilization control circuit described in some groups is in parallel, and the Current Control benchmark of each group current stabilization control circuit is identical.
The embodiment of the present invention additionally provides a kind of current stabilization control method, comprising: the first signal obtaining load, and by comparing the comparison signal obtaining the first signal in a period of time; Described comparison signal and setting threshold are compared, according to comparative result, output current controls benchmark; Load current and Current Control benchmark being compared, when load current is less than Current Control benchmark, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, reducing load current by regulating the first control switch.
Optionally, when comparison signal is higher than setting threshold, increase Current Control benchmark, when comparison signal is lower than setting threshold, reduce Current Control benchmark.
Optionally, also comprise: the change according to load current, the first control switch characteristic or temperature regulates setting threshold.
Optionally, described comparison signal is the difference of the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or the minimum value maximum in a period of time in the first signal.
Optionally, described first signal is the pressure drop between load current, the voltage of load one end, the pressure drop of load, the voltage of first control switch one end or the first control switch source and drain.
Compared with prior art, the technical program has the following advantages:
The first signal that described sampling comparison circuit is corresponding to load is sampled, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal and setting threshold are compared, according to comparative result, regulates the Current Control benchmark of adaptation control circuit; Adaptation control circuit is utilized to sample to load current, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.Due to the impedance magnitude utilizing Current Control benchmark automatically can regulate the first control switch, and then the load current flowing through load is stablized, ripple is less.
Accompanying drawing explanation
Fig. 1 is the structural representation of the current stabilization control circuit of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the current stabilization control circuit of one embodiment of the invention;
Fig. 3 is the circuit diagram of the sampling comparison circuit of an embodiment of the present invention embodiment;
Fig. 4 is the circuit structure diagram of the reference control circuit of an embodiment of the present invention embodiment;
Fig. 5 is the circuit structure diagram of the reference control circuit of an embodiment of the present invention embodiment;
Fig. 6 is the circuit structure diagram of the reference control circuit of an embodiment of the present invention embodiment;
Fig. 7 is the circuit structure diagram of the setting threshold acquisition cuicuit of an embodiment of the present invention embodiment.
Fig. 8 is the circuit structure diagram of the current stabilization control circuit of an embodiment of the present invention embodiment;
Fig. 9 is the circuit structure diagram of the current stabilization control circuit combination of an embodiment of the present invention embodiment.
Embodiment
The electric current produced due to existing current source is unstable, ripple can be produced, therefore a kind of current stabilization control circuit, corresponding electrical combination and current stabilization control method is embodiments provided, sampling comparison circuit first signal corresponding to load is utilized to sample, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal and setting threshold are compared, according to comparative result, regulates the Current Control benchmark of adaptation control circuit; Adaptation control circuit is utilized to sample to load current, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.The present invention utilizes Current Control benchmark automatically to regulate the impedance magnitude of the first control switch, and then the load current flowing through load is stablized, and ripple is less.
Below in conjunction with accompanying drawing, by specific embodiment, clear, complete description is carried out to technical scheme of the present invention.
Please refer to Fig. 1, for the structural representation of a kind of current stabilization control circuit of the embodiment of the present invention, comprising: power supply source 100, the load 200 be connected with power supply source 100, the adaptation control circuit 300 be connected with load 200, the sampling comparison circuit 400 that is connected with adaptation control circuit 300;
First signal of described sampling comparison circuit 400 pairs of load 200 correspondences is sampled, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal and setting threshold are compared, according to comparative result, regulates the Current Control benchmark of adaptation control circuit;
Described adaptation control circuit 300 pairs of load currents are sampled, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.
In the present embodiment, described power supply source 100 is current source.Filter capacitor can also be connected with to reduce ripple size to a certain extent in described current source.In other embodiments, described power supply source 100 also can be voltage source.Because current source or voltage source have ripple usually, therefore stroboscopic phenomenon can be produced.
Described power supply source 100 can integrate with adaptation control circuit 300 and comparison circuit 400 of sampling, also described load 200 can integrate with adaptation control circuit 300 and comparison circuit 400 of sampling, also can described power supply source 100, load 200 all separate with adaptation control circuit 300 and comparison circuit 400 of sampling.
Described power supply source 100 is connected with load 200.In the present embodiment, described load 200 is LED, and in other embodiments, described load also can be the electronic component of other consumed powers.
First signal of described sampling comparison circuit 400 pairs of load 200 correspondences is sampled, and described first signal is load current corresponding to load or load voltage.Wherein, load current is the electric current flowing through described load, described load voltage is the voltage that path that load current flows through records, the voltage one wherein of first control switch one end in such as, in the pressure drop at load 200 two ends, the voltage of load 200 one end, adaptation control circuit 300 pressure drop at the first control switch two ends, adaptation control circuit 300, when described first control switch is metal-oxide-semiconductor, described first control switch one end comprises source electrode, drain electrode or grid.
After sampling to the first signal, by comparing the comparison signal of acquisition first signal.In the present embodiment, described comparison signal is the maximum difference between the first signal that the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or a period of time internal burden are corresponding, namely the load current that in a period of time, described load is corresponding or load voltage minimum value, maximum, or the maximum difference between the load current that in a period of time, described load is corresponding or load voltage.
After described comparison signal and setting threshold compare, utilize described comparison signal can obtain the situation of load current change, and according to comparative result, the Current Control benchmark of output adaptive control circuit.Described setting threshold is a percentage of level threshold value or is a threshold value than the large fixed value of level threshold value or little fixed value, the comparison signal that wherein said level threshold value is load current to be recorded when being the normalized current of current source.
Described setting threshold can be fixed threshold or variable thresholding.Due to the comparison signal recorded when level threshold value be load current is the normalized current of current source, described level threshold value is subject to the impact of load current, the first control switch characteristic or variations in temperature, therefore, when described setting threshold is variable thresholding, described setting threshold also can change along with the change of load current, the first control switch characteristic or temperature.
Wherein in an embodiment, when comparison signal is higher than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is lower than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
In another embodiment, when also can work as comparison signal lower than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is higher than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
Wherein in an embodiment, when described first signal is load voltage, and described comparison signal is when being the minimum value in a period of time internal burden voltage, by the minimum value of described load voltage is compared with corresponding setting threshold, when comparison signal is higher than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is lower than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
In another embodiment, when described first signal is load current, and described comparison signal is when being the difference of minimum value maximum in a period of time internal burden electric current, by the maximum of described load current, the difference of minimum value are compared with corresponding setting threshold, when comparison signal is lower than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is higher than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
Described adaptation control circuit 300 pairs of load currents are sampled, and described load current and Current Control benchmark are compared.When load current is less than Current Control benchmark, increase load current by the impedance reducing the first control switch, when load current is greater than Current Control benchmark, reduce load current by the impedance improving the first control switch.
Please refer to Fig. 2, is the circuit diagram of the current stabilization control circuit of one embodiment of the invention.
Described adaptation control circuit 300 comprises: the first control switch 310, first current sampling resistor 330, first comparison circuit 320, one end of described first control switch 310 is connected with corresponding load 200, the other end of described first control switch 310 is connected with the first current sampling resistor 330, the first input end of described first comparison circuit 320 is connected with the first current sampling resistor 330, control benchmark by the second input input current of described first comparison circuit 320, the output of described first comparison circuit 320 is connected with the control end of the first control switch 310.
Described first control switch 310 carrys out regulating load electric current by regulating the impedance of the first control switch 310, described first control switch 310 is metal-oxide-semiconductor or triode, and described metal-oxide-semiconductor can be NMOS tube or PMOS, described triode can be NPN pipe or PNP pipe.Wherein in an embodiment, described first control switch 310 is NMOS tube, and control end is the grid of NMOS tube, by regulating the impedance between grid voltage control NMOS tube source-drain electrode.Meanwhile, at other control switchs of the present invention, such as the second control switch, the 4th control switch etc., also can be metal-oxide-semiconductor or triode.
Described first current sampling resistor 330 is for sampling by the load current of load.Described first comparison circuit 320 is operational amplifier, by comparing load current and Current Control benchmark, obtains the control signal that can control the first control switch 310 resistance.
In the present embodiment, please refer to Fig. 2, described sampling comparison circuit 400 comprises: the first sample circuit 410, setting threshold acquisition cuicuit 420, second comparison circuit 430, the adaptation control circuit 300 that one end of described first sample circuit 410 is corresponding with load 200 is connected, the other end of described first sample circuit 410 is connected with the first input end of the second comparison circuit 430, one end of described setting threshold acquisition cuicuit 420 is connected with the second input of the second comparison circuit 430, the output of described second comparison circuit 430 is connected with the second input of the first comparison circuit 320, for controlling benchmark to the first comparison circuit 320 output current.
Described first sample circuit 410 for sampling to the first signal, by comparing the comparison signal of acquisition first signal.
Described first sample circuit 410 can be connected with first control switch 310 one end in adaptation control circuit 300, thus samples to the voltage of first control switch 310 one end.
Described first sample circuit 410 also can be connected with the first control switch 310 two ends in adaptation control circuit 300, thus samples to the pressure drop at the first control switch 310 two ends.
Described first sample circuit 410 also can be connected with one end of load 200, thus samples to the voltage of load 200 one end.
Described first sample circuit 410 can also be connected with the two ends of load 200, thus samples to the pressure drop at load 200 two ends.
In another embodiment, when described first signal is load current, and described comparison signal is when being the difference of minimum value maximum in a period of time in the first signal, please refer to Fig. 3, described sampling comparison circuit comprises: the 3rd comparison circuit 460, second control switch 470, second comparison circuit 480, first electric capacity 490, the reverse input end of described 3rd comparison circuit 460 is connected with the positive input of the second comparison circuit 480, and be connected with corresponding adaptation control circuit, the positive input of described 3rd comparison circuit 460 and one end of the second control switch 470, one end of first electric capacity 490 is connected with the reverse input end of the second comparison circuit 480, the output of described 3rd comparison circuit 460 is connected with the control end of the second control switch 470, the other end of described second control switch 470 is connected with operating voltage Vdd, the other end ground connection of described first electric capacity 490, the output of described second comparison circuit 480 is used for the Current Control benchmark of output adaptive control circuit.
In another embodiment, described sampling comparison circuit also comprises reference control circuit 4401, please refer to Fig. 4, described reference control circuit 4401 comprises: counter 4411, sliding window averaging unit 4421, D/A converter 4431, described counter 4411, sliding window averaging unit 4421, D/A converter 4431 connects successively, the output of the second comparison circuit 430 is connected with counter 4411, when the first signal is the control end voltage of the first control switch 310, the control end voltage in 4411 pairs of a period of times of counter is utilized to count, and utilize sliding window averaging unit 4421 to obtain corresponding voltage control benchmark, described sliding window averaging unit 4421 may be used for filtering on the one hand, described sliding window averaging unit 4421 can be separated historical data with current data on the other hand, can not become slow because historical data is too many to the process of current data, be conducive to improving treatment effeciency, and utilize the Current Control benchmark of the output output adaptive control circuit of described D/A converter 4431.
In another embodiment, described sampling comparison circuit also comprises reference control circuit 4402, please refer to Fig. 5, described reference control circuit 4402 comprises: the first metal-oxide-semiconductor M1, second metal-oxide-semiconductor M1, pull-up current source V1, the drain electrode of described first metal-oxide-semiconductor M1 and grid, the output of the second comparison circuit 430 is connected, the grid of described first metal-oxide-semiconductor M1 is connected with the grid of the second metal-oxide-semiconductor M2, the one termination operating voltage Vdd of described pull-up current source V1, the source electrode of described first metal-oxide-semiconductor M1, the source ground of the second metal-oxide-semiconductor M2, the drain electrode of described second metal-oxide-semiconductor M2 is connected as the output end vo ut of comparison circuit of sampling with the other end of pull-up current source V1, the Current Control benchmark of output adaptive control circuit.
In another embodiment, described sampling comparison circuit also comprises reference control circuit, please refer to Fig. 6, and described reference control circuit 4403 comprises: the 3rd metal-oxide-semiconductor M3, 4th metal-oxide-semiconductor M4, 5th metal-oxide-semiconductor M5, 6th metal-oxide-semiconductor M6, 7th metal-oxide-semiconductor M7, 8th metal-oxide-semiconductor M8, described 3rd metal-oxide-semiconductor M3, 4th metal-oxide-semiconductor M4 forms the first current mirror, described 5th metal-oxide-semiconductor M5, 6th metal-oxide-semiconductor M6 forms the second current mirror, the output of described second comparison circuit 430 and the 7th metal-oxide-semiconductor M7, the source electrode of the 8th metal-oxide-semiconductor M8, the drain electrode of described 7th metal-oxide-semiconductor M7 and the drain electrode of the 5th metal-oxide-semiconductor M5, grid is connected, the drain electrode of described 8th metal-oxide-semiconductor M8 and the drain electrode of the 3rd metal-oxide-semiconductor M3, grid is connected, the source electrode of described 3rd metal-oxide-semiconductor M3, the source ground of the 4th metal-oxide-semiconductor M4, described 5th metal-oxide-semiconductor M5, the source electrode of the 6th metal-oxide-semiconductor M6 connects operating voltage, the drain electrode of described 4th metal-oxide-semiconductor M4, the drain electrode of the 6th metal-oxide-semiconductor M6 is connected with the output of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
In the present embodiment, described setting threshold acquisition cuicuit 420 is for obtaining variable thresholding, the concrete structure of described setting threshold acquisition cuicuit 420 please refer to Fig. 7, comprise: Feedback Current Source 421, fixed bias 422, 4th control switch 423, second sampling resistor 424, described Feedback Current Source 421, fixed bias 422, 4th control switch 423, second sampling resistor 424 connects successively, and the input of described Feedback Current Source 421 is connected with the output of the second comparison circuit 430 or wherein one end of load, described fixed bias 422 or the 4th control switch 423 wherein one end are connected as second input of output with the second comparison circuit 430, described Feedback Current Source 421 produces proportional electric current corresponding to load current according to load current or Current Control benchmark, first control switch 310, first current sampling resistor 330 of described 4th control switch 423, second sampling resistor structure 424 and adaptation control circuit is corresponding proportional respectively.Because described Feedback Current Source produces corresponding proportional electric current according to load current, therefore described variable thresholding changes with the change of load current.And due to the first control switch of described 4th control switch, the second sampling resistor structure and adaptation control circuit, the first current sampling resistor respectively corresponding proportional, therefore described variable thresholding changes with the change of the first control switch characteristic or temperature.
In other embodiments, the output of described sampling comparison circuit 400 is also parallel with the first filter capacitor, utilizes described first filter capacitor to make the ripple of the load current of each road load less.
In the present embodiment, because the first comparison circuit is used for comparing for Current Control benchmark and load current, therefore described second comparison circuit is operational transconductance amplifier, exports as current signal.In other embodiments, described second comparison circuit also can for exporting the operational amplifier for voltage, and final generation voltage control benchmark and load current compare.
In the present embodiment, a load correspondence has an adaptation control circuit and sampling comparison circuit.In other embodiments, please refer to Fig. 8, load 200 correspondence can also have 2 or multiple adaptation control circuit 300 and sampling comparison circuit 400, multiple adaptation control circuit and sampling comparison circuit is utilized to carry out current stabilization to a load, because the load current sharing each road adaptation control circuit and sampling comparison circuit is less, make the power consumption that consumes on adaptation control circuit less, be conducive to the power consumption of saving system.
Present invention also offers the combination of a kind of current stabilization control circuit, please refer to Fig. 9, comprise: the described current stabilization control circuit of many groups is in parallel, often organize current stabilization control circuit and all comprise load 200, the adaptation control circuit 300 be connected with load 200, the sampling comparison circuit 400 be connected with adaptation control circuit 300, and in the present embodiment, each group current stabilization control circuit also has a power supply source respectively, second input of the first comparison circuit in the adaptation control circuit of each group current stabilization control circuit is all connected to each other, make the Current Control benchmark of each group current stabilization control circuit all identical, thus the load current that can realize the load of many groups all keeps current stabilization simultaneously, ripple is less.In other embodiments, each group current stabilization control circuit also can share a power supply source.And can be provided separately due to each current stabilization control circuit of described current stabilization control circuit combination, be conducive to improving flexibility, be convenient to the expansion of circuit.
Based on the current stabilization control circuit of the invention described above embodiment, the embodiment of the present invention additionally provides a kind of current stabilization control method, specifically comprises:
Step S101, obtains the first signal of load, and by comparing the comparison signal obtaining the first signal in a period of time;
Step S102, compares described comparison signal and setting threshold, and according to comparative result, output current controls benchmark;
Step S103, load current and Current Control benchmark being compared, when load current is less than Current Control benchmark, increasing load current by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.
Described first signal is load current corresponding to each road load or load voltage.Described comparison signal is the difference of the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or the minimum value maximum in a period of time in the first signal.
Wherein in an embodiment, when comparison signal is higher than setting threshold, increase the Current Control benchmark of adaptation control circuit, improve the control voltage of the first control switch, the impedance of the first control switch is diminished, by reducing the impedance of the first control switch to increase load current, when comparison signal is lower than setting threshold, reducing the Current Control benchmark of adaptation control circuit, by reducing the control voltage of the first control switch, increasing the impedance of the first control switch to reduce load current.
In another embodiment, when also can work as comparison signal higher than setting threshold, reduce the Current Control benchmark of adaptation control circuit, reduce the control voltage of the first control switch, make the impedance of the first control switch become large to reduce load current.When comparison signal is lower than setting threshold, increases the Current Control benchmark of adaptation control circuit, by improving the control voltage of the first control switch, reducing the impedance of the first control switch to increase load current.
Described setting threshold is fixed threshold or variable thresholding, and when described setting threshold is variable thresholding, the change according to load current, the first control switch characteristic or temperature regulates setting threshold.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (18)
1. a current stabilization control circuit, is characterized in that, comprising: power supply source, the load be connected with power supply source, the adaptation control circuit be connected with load, the sampling comparison circuit that is connected with described adaptation control circuit;
The first signal that described sampling comparison circuit is corresponding to load is sampled, by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal is the difference of the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or the minimum value maximum in a period of time in the first signal, described comparison signal and setting threshold are compared, according to comparative result, the Current Control benchmark of output adaptive control circuit;
Described adaptation control circuit is sampled to load current, described load current and Current Control benchmark are compared, when load current is less than Current Control benchmark, load current is increased by regulating the first control switch, when load current is greater than Current Control benchmark, reduce load current by regulating the first control switch.
2. current stabilization control circuit as claimed in claim 1, is characterized in that, described first signal is the pressure drop between load current, the voltage of load one end, the pressure drop of load, the voltage of first control switch one end or the first control switch source and drain.
3. current stabilization control circuit as claimed in claim 1, it is characterized in that, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit,
One end of described first sample circuit is connected with adaptation control circuit, first signal corresponding to load is sampled, the other end of described first sample circuit is connected with the first input end of the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of the second comparison circuit, the Current Control benchmark of the output output adaptive control circuit of described second comparison circuit.
4. current stabilization control circuit as claimed in claim 3, it is characterized in that, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: the first metal-oxide-semiconductor, second metal-oxide-semiconductor, pull-up current source, the drain electrode of described first metal-oxide-semiconductor and grid, the output of the second comparison circuit is connected, the grid of described first metal-oxide-semiconductor is connected with the grid of the second metal-oxide-semiconductor, the one termination operating voltage in described pull-up current source, the source electrode of described first metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor, the drain electrode of described second metal-oxide-semiconductor is connected with the other end in pull-up current source as the output of comparison circuit of sampling, the Current Control benchmark of output adaptive control circuit.
5. current stabilization control circuit as claimed in claim 3, it is characterized in that, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: the 3rd metal-oxide-semiconductor, 4th metal-oxide-semiconductor, 5th metal-oxide-semiconductor, 6th metal-oxide-semiconductor, 7th metal-oxide-semiconductor, 8th metal-oxide-semiconductor, described 3rd metal-oxide-semiconductor, 4th metal-oxide-semiconductor forms the first current mirror, described 5th metal-oxide-semiconductor, 6th metal-oxide-semiconductor forms the second current mirror, the output of described second comparison circuit and the 7th metal-oxide-semiconductor, the source electrode of the 8th metal-oxide-semiconductor is connected, the drain electrode of described 7th metal-oxide-semiconductor and the drain electrode of the 5th metal-oxide-semiconductor, grid is connected, the drain electrode of described 8th metal-oxide-semiconductor and the drain electrode of the 3rd metal-oxide-semiconductor, grid is connected, the source electrode of described 3rd metal-oxide-semiconductor, the source ground of the 4th metal-oxide-semiconductor, described 5th metal-oxide-semiconductor, the source electrode of the 6th metal-oxide-semiconductor connects operating voltage, the drain electrode of described 4th metal-oxide-semiconductor, the drain electrode of the 6th metal-oxide-semiconductor is connected with the output of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
6. current stabilization control circuit as claimed in claim 1, it is characterized in that, when described first signal is load current, and described comparison signal is when being the difference of minimum value maximum in a period of time in the first signal, described sampling comparison circuit comprises: the 3rd comparison circuit, second control switch, second comparison circuit, the reverse input end of described 3rd comparison circuit is connected with the positive input of the second comparison circuit, and be connected with corresponding adaptation control circuit, the described positive input of the 3rd comparison circuit and one end of the second control switch, one end of first electric capacity is connected with the reverse input end of the second comparison circuit, the output of described 3rd comparison circuit is connected with the control end of the second control switch, the other end of described second control switch is connected with operating voltage, the other end ground connection of described first electric capacity, the output of described second comparison circuit is used for the Current Control benchmark of output adaptive control circuit.
7. the current stabilization control circuit as described in claim 4 ~ 6 any one, is characterized in that, the output of described sampling comparison circuit is parallel with the first filter capacitor.
8. current stabilization control circuit as claimed in claim 3, it is characterized in that, described sampling comparison circuit also comprises reference control circuit, described reference control circuit comprises: counter, sliding window averaging unit, D/A converter, described counter, sliding window averaging unit, D/A converter connect successively, the output of the second comparison circuit is connected with counter, obtain corresponding voltage control benchmark by counter and sliding window averaging unit, and utilize the Current Control benchmark of the output output adaptive control circuit of described D/A converter.
9. current stabilization control circuit as claimed in claim 1, it is characterized in that, described adaptation control circuit comprises: the first control switch, first current sampling resistor, first comparison circuit, one end of described first control switch is connected with corresponding load, the other end of described first control switch is connected with the first current sampling resistor, the first input end of described first comparison circuit is connected with the first current sampling resistor, second input input current of described first comparison circuit controls benchmark, the output of described first comparison circuit is connected with the control end of the first control switch.
10. current stabilization control circuit as claimed in claim 1, it is characterized in that, described setting threshold is fixed threshold or variable thresholding.
11. current stabilization control circuits as claimed in claim 10, it is characterized in that, when described setting threshold is variable thresholding, setting threshold acquisition cuicuit comprises: Feedback Current Source, fixed bias, the 4th control switch, the second sampling resistor, described Feedback Current Source, fixed bias, the 4th control switch, the second sampling resistor connect successively, and the input of described Feedback Current Source obtains load current, described fixed bias or the 4th control switch wherein one end are connected with the second input of the second comparison circuit as output; Described Feedback Current Source produces corresponding proportional electric current according to load current; First control switch, first current sampling resistor of described 4th control switch, the second sampling resistor structure and adaptation control circuit are corresponding proportional respectively.
12. current stabilization control circuits as described in claim 10 or 11, it is characterized in that, described variable thresholding changes with the change of load current, the first control switch characteristic or temperature.
13. current stabilization control circuits as claimed in claim 1, is characterized in that, a load correspondence has one or more adaptation control circuit be connected with load and comparison circuit of sampling.
14. 1 kinds of current stabilization control circuit combinations, is characterized in that, comprising: some groups of current stabilization control circuits as claimed in claim 1 are in parallel, and the Current Control benchmark of each group current stabilization control circuit is identical.
15. 1 kinds of current stabilization control methods, is characterized in that, comprising:
Obtain the first signal of load, and by comparing the comparison signal obtaining the first signal in a period of time, described comparison signal is the difference of the minimum value in a period of time in the first signal, the maximum in a period of time in the first signal or the minimum value maximum in a period of time in the first signal;
Described comparison signal and setting threshold are compared, according to comparative result, output current controls benchmark;
Load current and Current Control benchmark being compared, when load current is less than Current Control benchmark, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, reducing load current by regulating the first control switch.
16. current stabilization control methods as claimed in claim 15, is characterized in that, when comparison signal is higher than setting threshold, increase Current Control benchmark, when comparison signal is lower than setting threshold, reduce Current Control benchmark.
17. current stabilization control methods as claimed in claim 15, is characterized in that, also comprise: the change according to load current, the first control switch characteristic or temperature regulates setting threshold.
18. current stabilization control methods as claimed in claim 15, is characterized in that, described first signal is the pressure drop between load current, the voltage of load one end, the pressure drop of load, the voltage of first control switch one end or the first control switch source and drain.
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| TWI595735B (en) * | 2015-03-24 | 2017-08-11 | 立錡科技股份有限公司 | Current regulator circuit capable of reducing current ripple and method of reducing current ripple |
| CN207083253U (en) * | 2016-10-26 | 2018-03-09 | 杰华特微电子（张家港）有限公司 | A kind of adaptive fast response circuit and LED drive circuit |
| CN106658866B (en) * | 2017-02-09 | 2018-12-25 | 上海晶丰明源半导体股份有限公司 | For eliminating the controller, chip and method of LED drive system current ripples |
| CN107734770B (en) * | 2017-11-07 | 2020-01-03 | 昂宝电子（上海）有限公司 | Method and system for eliminating LED stroboscopic |
| CN111366204B (en) * | 2020-02-28 | 2022-03-08 | 龙芯中科(金华)技术有限公司 | Flow measurement circuit and method |
| CN114780477B (en) * | 2022-06-22 | 2022-10-04 | 龙迅半导体（合肥）股份有限公司 | TYPE-C configuration channel receiver, data processing method and electronic equipment |
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| CN202617454U (en) * | 2012-05-29 | 2012-12-19 | 英飞特光电（杭州）有限公司 | Light-emitting diode (LED) driving circuit with light dimming function |
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