CN103747599A - Current stabilizing control circuit, corresponding circuit combination and current stabilizing control method - Google Patents
Current stabilizing control circuit, corresponding circuit combination and current stabilizing control method Download PDFInfo
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- CN103747599A CN103747599A CN201410040888.1A CN201410040888A CN103747599A CN 103747599 A CN103747599 A CN 103747599A CN 201410040888 A CN201410040888 A CN 201410040888A CN 103747599 A CN103747599 A CN 103747599A
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Abstract
The invention discloses a current stabilizing control circuit, a corresponding circuit combination and a current stabilizing control method. The current stabilizing control circuit adopts a comparison circuit to sample a first signal corresponding to a load, a comparison signal of the first signal in a certain period is obtained by comparison, the comparison signal and a set threshold value are compared, and the current control standard of a self-adaptive control circuit is adjusted according to the comparison result; the self-adaptive control circuit is used for sampling a load current, the load current and the current control standard are compared, when being smaller than the current control standard, the load current is increased by adjusting a first control switch, and when being larger than the current control standard, the load current is reduced by the first control switch. The impedance of the first control switch is automatically adjusted by using the current control standard, so the load current flowing by the load is stabilized, ripple waves are smaller and the current stabilizing control circuit can also be expanded in parallel.
Description
Technical field
The present invention relates to current source technology field, particularly a kind of current stabilization control circuit, corresponding circuit combine and current stabilization control method.
Background technology
Current source can provide electric current to load, so 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 stablizing amplitude for one or more LED.
But when the speed of the current controlled circuit of LED driver 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, it is current ripples, when thering is the electric current of ripple and flow through LED lamp, the brightness meeting of LED lamp changes along with ripple, produces stroboscopic phenomenon, and this stroboscopic phenomenon is unacceptable at some to the strict occasion of light source requirements.
Summary of the invention
The problem that the present invention solves is to provide a kind of current stabilization control circuit, corresponding circuit combines and current stabilization control method, makes the electric current current stabilization of current source output.
For addressing the above problem, the embodiment of the present invention provides a kind of current stabilization control circuit, comprising: power supply source, the load being connected with power supply source, the adaptation control circuit being connected with load, the sampling comparison circuit being connected with described adaptation control circuit; Described sampling comparison circuit is sampled to first signal corresponding to load, by relatively obtaining the comparison signal of 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, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, by regulating the first control switch to reduce load current.
Optionally, described comparison signal is the maximum in first signal or the minimum value maximum in first signal poor in a period of time in the minimum value in first signal, a period of time in a period of time.
Optionally, the pressure drop between leaking of the voltage that described first signal is load current, the voltage of load one end, the pressure drop of load, first control switch one end or the first control switch source.
Described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, one end of described the first sample circuit is connected with adaptation control circuit, the first signal that load is corresponding is sampled, the other end of described the 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 the second comparison circuit.
Optionally, described sampling comparison circuit also comprises benchmark control circuit, described benchmark 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, by counter and sliding window averaging unit, obtain corresponding voltage control benchmark, 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 benchmark control circuit, described benchmark control circuit comprises: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, pull-up current source, the drain electrode of described the first metal-oxide-semiconductor and grid, the output of the second comparison circuit is connected, the grid of described the 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 the first metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor, the drain electrode of described the second metal-oxide-semiconductor is connected with the other end in pull-up current source as the output of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
Optionally, described sampling comparison circuit also comprises benchmark control circuit, described benchmark control circuit comprises: the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor, described the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor forms the first current mirror, described the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor forms the second current mirror, the output of described the second comparison circuit and the 7th metal-oxide-semiconductor, the source electrode of the 8th metal-oxide-semiconductor, the drain electrode of the drain electrode of described the 7th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, grid is connected, the drain electrode of the drain electrode of described the 8th metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, grid is connected, the source electrode of described the 3rd metal-oxide-semiconductor, the source ground of the 4th metal-oxide-semiconductor, described the 5th metal-oxide-semiconductor, the source electrode of the 6th metal-oxide-semiconductor connects operating voltage, the drain electrode of described the 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 when described comparison signal is the difference of the minimum value maximum in first signal in a period of time, described sampling comparison circuit comprises: the 3rd comparison circuit, the second control switch, the second comparison circuit, the positive input of described the 3rd comparison circuit is connected with the reverse input end of the second comparison circuit, and be connected with corresponding adaptation control circuit, one end of the reverse input end of described the 3rd comparison circuit and the second control switch, one end of the first electric capacity is connected with the positive input of the second comparison circuit, the output of described the 3rd comparison circuit is connected with the control end of the second control switch, the other end of described the second control switch is connected with operating voltage, the other end ground connection of described the first electric capacity, the output of described the second comparison circuit is 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 the first control switch is connected with corresponding load, the other end of described the first control switch is connected with the first current sampling resistor, the first input end of described the first comparison circuit is connected with the first current sampling resistor, the second input input current of described the first comparison circuit is controlled benchmark, and the output of described the 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, and 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; The first control switch of described the 4th control switch, the second sampling resistor structure and adaptation control circuit, the first current sampling resistor 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 circuits that are connected with load and sampling comparison circuit.
The embodiment of the present invention also provides a kind of current stabilization control circuit combination, 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 also provides a kind of current stabilization control method, comprising: obtain the first signal of load, and by relatively obtaining the comparison signal of first signal in a period of time; Described comparison signal and setting threshold are compared, and according to comparative result, output current is controlled benchmark; Load current and Current Control benchmark are 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, by regulating the first control switch to reduce load current.
Optionally, when comparison signal is during higher than setting threshold, increase Current Control benchmark, when comparison signal is during lower than setting threshold, reduce Current Control benchmark.
Optionally, also comprise: according to the change of load current, the first control switch characteristic or temperature, regulate setting threshold.
Optionally, described comparison signal is the maximum in first signal or the minimum value maximum in first signal poor in a period of time in the minimum value in first signal, a period of time in a period of time.
Optionally, the pressure drop between leaking of the voltage that described first signal is load current, the voltage of load one end, the pressure drop of load, first control switch one end or the first control switch source.
Compared with prior art, the technical program has the following advantages:
Described sampling comparison circuit is sampled to first signal corresponding to load, by relatively obtaining the comparison signal of 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; 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, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, by regulating the first control switch to reduce load current.Owing to utilizing Current Control benchmark can automatically regulate the impedance magnitude of the first control switch, and then the load current of the load that makes to flow through is stable, and 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 embodiment of the present invention;
Fig. 4 is the circuit structure diagram of the benchmark control circuit of an embodiment of the embodiment of the present invention;
Fig. 5 is the circuit structure diagram of the benchmark control circuit of an embodiment of the embodiment of the present invention;
Fig. 6 is the circuit structure diagram of the benchmark control circuit of an embodiment of the embodiment of the present invention;
Fig. 7 is the circuit structure diagram of the setting threshold acquisition cuicuit of an embodiment of the embodiment of the present invention.
Fig. 8 is the circuit structure diagram of the current stabilization control circuit of an embodiment of the embodiment of the present invention;
Fig. 9 is the circuit structure diagram of the current stabilization control circuit combination of an embodiment of the embodiment of the present invention.
Embodiment
Because the electric current that existing current source produces is unstable, can produce ripple, therefore the embodiment of the present invention provides a kind of current stabilization control circuit, corresponding circuit to combine and current stabilization control method, utilize sampling comparison circuit to sample to first signal corresponding to load, by relatively obtaining the comparison signal of 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; 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, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, by regulating the first control switch to reduce load current.The present invention utilizes Current Control benchmark automatically to regulate the impedance magnitude of the first control switch, and then the load current of the load that makes to flow through is stable, and ripple is less.
Below in conjunction with accompanying drawing, by specific embodiment, technical scheme of the present invention is carried out to clear, complete description.
Please refer to Fig. 1, structural representation for a kind of current stabilization control circuit of the embodiment of the present invention, comprising: power supply source 100, the load 200 being connected with power supply source 100, the adaptation control circuit 300 being connected with load 200, the sampling comparison circuit 400 being connected with adaptation control circuit 300;
The first signal of 400 pairs of load 200 correspondences of described sampling comparison circuit is sampled, by relatively obtaining the comparison signal of 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;
300 pairs of load currents of described adaptation control circuit are sampled, described load current and Current Control benchmark are 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, by regulating the first control switch to reduce load current.
In the present embodiment, described power supply source 100 is current source.In described current source, can also be connected with filter capacitor to reduce to a certain extent ripple size.In other embodiments, described power supply source 100 can be also voltage source.Because current source or voltage source have ripple conventionally, therefore can produce stroboscopic phenomenon.
Described power supply source 100 can integrate with adaptation control circuit 300 and sampling comparison circuit 400, also can be described load 200 integrate with adaptation control circuit 300 and sampling comparison circuit 400, also can described power supply source 100, load 200 all separates with adaptation control circuit 300 and the comparison circuit 400 of sampling.
Described power supply source 100 is connected with load 200.In the present embodiment, described load 200 is LED lamp, and in other embodiments, described load can be also the electronic component of other consumed powers.
The first signal of 400 pairs of load 200 correspondences of described sampling comparison circuit is sampled, and described first signal is load current corresponding to load or load voltage.Wherein, load current is the electric current that flows through described load, described load voltage is the voltage that path that load current flows through records, for example, in the voltage of the pressure drop at load 200 two ends, load 200 one end, adaptation control circuit 300 wherein a kind of of the voltage of first control switch one end in the pressure drop at the first control switch two ends, adaptation control circuit 300, when described the first control switch is metal-oxide-semiconductor, described first control switch one end comprises source electrode, drain electrode or grid.
After first signal is sampled, by relatively obtaining the comparison signal of first signal.In the present embodiment, described comparison signal is the maximum difference between the first signal that minimum value, the maximum in a period of time in first signal or a period of time internal burden in interior first signal of a period of time is corresponding, be load current corresponding to described load or load voltage minimum value in a period of time, maximum, or load current corresponding to described load or the maximum difference between load voltage in a period of time.
After described comparison signal and setting threshold compare, utilize described comparison signal can obtain the situation that load current changes, and according to comparative result, the Current Control benchmark of output adaptive control circuit.Described setting threshold is percentage of level threshold value or for than a threshold value of the large fixed value of level threshold value or little fixed value, and wherein said level threshold value is the comparison signal that load current records while being the normalized current of current source.
Described setting threshold can be fixed threshold or variable thresholding.Because level threshold value is the comparison signal that load current records while being 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.
Therein in an embodiment, when comparison signal is during higher than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is during lower than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
In another embodiment, in the time of also can working as comparison signal lower than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
Therein in an embodiment, when described first signal is load voltage, and when described comparison signal is 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 during higher than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is during lower than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
In another embodiment, when described first signal is load current, and when described comparison signal is the difference of the minimum value maximum in a period of time internal burden electric current, by the difference of the maximum of described load current, minimum value is compared with corresponding setting threshold, when comparison signal is during lower than setting threshold, increase the Current Control benchmark of adaptation control circuit, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of adaptation control circuit.
300 pairs of load currents of described adaptation control circuit are sampled, and described load current and Current Control benchmark are compared.When load current is less than Current Control benchmark, by reducing the impedance of the first control switch, increase load current, when load current is greater than Current Control benchmark, by improving the impedance of the first control switch, reduce load current.
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, the first current sampling resistor 330, the first comparison circuit 320, one end of described the first control switch 310 is connected with corresponding load 200, the other end of described the first control switch 310 is connected with the first current sampling resistor 330, the first input end of described the first comparison circuit 320 is connected with the first current sampling resistor 330, the second input input current by described the first comparison circuit 320 is controlled benchmark, and the output of described the first comparison circuit 320 is connected with the control end of the first control switch 310.
Described the first control switch 310 is by regulating the impedance of the first control switch 310 to carry out regulating load electric current, described the first control switch 310 is metal-oxide-semiconductor or triode, and described metal-oxide-semiconductor can be NMOS pipe or PMOS pipe, described triode can be NPN pipe or PNP pipe.In an embodiment, described the first control switch 310 is NMOS pipe therein, and control end is the grid of NMOS pipe, by regulating grid voltage to control the impedance between NMOS pipe source-drain electrode.Meanwhile, at other control switchs of the present invention, such as the second control switch, the 4th control switch etc., can be also metal-oxide-semiconductor or triode.
Described the first current sampling resistor 330 is for sampling by the load current of load.Described the first comparison circuit 320 is operational amplifier, and by comparing load current and Current Control benchmark, acquisition can be controlled the control signal of 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, the second comparison circuit 430, one end of described the first sample circuit 410 adaptation control circuit 300 corresponding with load 200 is connected, the other end of described the 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 the 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 currents.
Described the first sample circuit 410 is for first signal is sampled, by relatively obtaining the comparison signal of first signal.
Described the first sample circuit 410 can be connected with first control switch 310 one end in adaptation control circuit 300, thereby the voltage of first control switch 310 one end is sampled.
Described the first sample circuit 410 also can be connected with the first control switch 310 two ends in adaptation control circuit 300, thereby the pressure drop at the first control switch 310 two ends is sampled.
Described the first sample circuit 410 also can be connected with one end of load 200, thereby the voltage of load 200 one end is sampled.
Described the first sample circuit 410 can also be connected with the two ends of load 200, thereby the pressure drop at load 200 two ends is sampled.
In another embodiment, when described first signal is load current, and when described comparison signal is the difference of the minimum value maximum in first signal in a period of time, please refer to Fig. 3, described sampling comparison circuit comprises: the 3rd comparison circuit 460, the second control switch 470, the second comparison circuit 480, the first electric capacity 490, the reverse input end of described the 3rd comparison circuit 460 is connected with the positive input of the second comparison circuit 480, and be connected with corresponding adaptation control circuit, one end of the positive input of described the 3rd comparison circuit 460 and the second control switch 470, one end of the first electric capacity 490 is connected with the reverse input end of the second comparison circuit 480, the output of described the 3rd comparison circuit 460 is connected with the control end of the second control switch 470, the other end of described the second control switch 470 is connected with operating voltage Vdd, the other end ground connection of described the first electric capacity 490, the output of described the second comparison circuit 480 is for the Current Control benchmark of output adaptive control circuit.
In another embodiment, described sampling comparison circuit also comprises benchmark control circuit 4401, please refer to Fig. 4, described benchmark 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 first signal is the control end voltage of the first control switch 310, utilize the control end voltage of counter in 4411 pairs of a period of times to count, and utilize sliding window averaging unit 4421 to obtain corresponding voltage control benchmark, described sliding window averaging unit 4421 can be for filtering on the one hand, described sliding window averaging unit 4421 can be separated with current data historical data on the other hand, to the processing of current data, can not become slow because historical data is too many, be conducive to improve 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 benchmark control circuit 4402, please refer to Fig. 5, described benchmark control circuit 4402 comprises: the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M1, pull-up current source V1, the drain electrode of described the first metal-oxide-semiconductor M1 and grid, the output of the second comparison circuit 430 is connected, the grid of described the first metal-oxide-semiconductor M1 is connected with the grid of the second metal-oxide-semiconductor M2, a termination operating voltage Vdd of described pull-up current source V1, the source electrode of described the first metal-oxide-semiconductor M1, the source ground of the second metal-oxide-semiconductor M2, the drain electrode of described the second metal-oxide-semiconductor M2 is connected with the other end of pull-up current source V1 as the output end vo ut of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
In another embodiment, described sampling comparison circuit also comprises benchmark control circuit, please refer to Fig. 6, and described benchmark control circuit 4403 comprises: the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, described the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 forms the first current mirror, described the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6 forms the second current mirror, the output of described the 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 the drain electrode of described the 7th metal-oxide-semiconductor M7 and the 5th metal-oxide-semiconductor M5, grid is connected, the drain electrode of the drain electrode of described the 8th metal-oxide-semiconductor M8 and the 3rd metal-oxide-semiconductor M3, grid is connected, the source electrode of described the 3rd metal-oxide-semiconductor M3, the source ground of the 4th metal-oxide-semiconductor M4, described the 5th metal-oxide-semiconductor M5, the source electrode of the 6th metal-oxide-semiconductor M6 connects operating voltage, the drain electrode of described the 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, the 4th control switch 423, the second sampling resistor 424, described Feedback Current Source 421, fixed bias 422, the 4th control switch 423, the 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 with the second input of the second comparison circuit 430 as output, described Feedback Current Source 421 produces proportional electric current corresponding to load current according to load current or Current Control benchmark, the first control switch 310 of described the 4th control switch 423, the second sampling resistor structure 424 and adaptation control circuit, the first current sampling resistor 330 are distinguished corresponding proportional.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 because the first control switch, first current sampling resistor of described the 4th control switch, the second sampling resistor structure and adaptation control circuit are corresponding proportional respectively, 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 the first filter capacitor to make the ripple of load current of each road load less.
In the present embodiment, because the first comparison circuit is for being relatively Current Control benchmark and load current, therefore described the second comparison circuit is operational transconductance amplifier, is output as current signal.In other embodiments, described the second comparison circuit also can, for being output as the operational amplifier of voltage, finally producing voltage control benchmark and load current and 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, a load 200 can also correspondence have 2 or a plurality of adaptation control circuit 300 and sampling comparison circuit 400, utilize a plurality of adaptation control circuits and sampling comparison circuit to carry out current stabilization to a load, less with the load current of sampling comparison circuit owing to sharing each road adaptation control circuit, make the power consumption that consumes on adaptation control circuit less, be conducive to the power consumption of the system of saving.
The present invention also provides a kind of current stabilization control circuit combination, please refer to Fig. 9, comprise: organize described current stabilization control circuit in parallel more, every group of current stabilization control circuit all comprises load 200, the adaptation control circuit 300 being connected with load 200, the sampling comparison circuit 400 being connected with adaptation control circuit 300, and in the present embodiment, each group current stabilization control circuit also has respectively a power supply source, the 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, thereby the load current that can simultaneously realize the load of many groups all keeps current stabilization, ripple is less.In other embodiments, each is organized current stabilization control circuit and also can share a power supply source.And because each current stabilization control circuit of described current stabilization control circuit combination can divide, be arranged, be conducive to improve flexibility, be convenient to the expansion of circuit.
Current stabilization control circuit based on the invention described above embodiment, the embodiment of the present invention also provides a kind of current stabilization control method, specifically comprises:
Step S101, obtains the first signal of load, and by relatively obtaining the comparison signal of first signal in a period of time;
Step S102, compares described comparison signal and setting threshold, and according to comparative result, output current is controlled benchmark;
Step S103, load current and Current Control benchmark are 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, by regulating the first control switch to reduce load current.
Corresponding load current or the load voltage of described first signal Wei Ge road load.Described comparison signal is the maximum in first signal or the minimum value maximum in first signal poor in a period of time in the minimum value in first signal, a period of time in a period of time.
Therein in an embodiment, when comparison signal is during 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, the impedance by reducing the first control switch is to increase load current, when comparison signal is during lower than setting threshold, reduce the Current Control benchmark of adaptation control circuit, by reducing the control voltage of the first control switch, increase the impedance of the first control switch to reduce load current.
In another embodiment, in the time of also can working 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, the impedance of the first control switch is become greatly to reduce load current.When comparison signal is during lower than setting threshold, increase the Current Control benchmark of adaptation control circuit, by improving the control voltage of the first control switch, reduce the impedance of the first control switch to increase load current.
Described setting threshold is fixed threshold or variable thresholding, when described setting threshold is variable thresholding, according to the change of 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; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (20)
1. a current stabilization control circuit, is characterized in that, comprising: power supply source, the load being connected with power supply source, the adaptation control circuit being connected with load, the sampling comparison circuit being connected with described adaptation control circuit;
Described sampling comparison circuit is sampled to first signal corresponding to load, by relatively obtaining the comparison signal of 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, by regulating the first control switch to increase load current, when load current is greater than Current Control benchmark, by regulating the first control switch to reduce load current.
2. current stabilization control circuit as claimed in claim 1, it is characterized in that, described comparison signal is the maximum in first signal or the minimum value maximum in first signal poor in a period of time in the minimum value in first signal, a period of time in a period of time.
3. current stabilization control circuit as claimed in claim 1, is characterized in that, described first signal is the voltage of load current, the voltage of load one end, the pressure drop of load, first control switch one end or the pressure drop between the leakage of the first control switch source.
4. current stabilization control circuit as claimed in claim 1, 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 the first sample circuit is connected with adaptation control circuit, the first signal that load is corresponding is sampled, the other end of described the 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 the second comparison circuit.
5. current stabilization control circuit as claimed in claim 4, it is characterized in that, described sampling comparison circuit also comprises benchmark control circuit, described benchmark control circuit comprises: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, pull-up current source, the drain electrode of described the first metal-oxide-semiconductor and grid, the output of the second comparison circuit is connected, the grid of described the 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 the first metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor, the drain electrode of described the second metal-oxide-semiconductor is connected with the other end in pull-up current source as the output of sampling comparison circuit, the Current Control benchmark of output adaptive control circuit.
6. current stabilization control circuit as claimed in claim 4, it is characterized in that, described sampling comparison circuit also comprises benchmark control circuit, described benchmark control circuit comprises: the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor, the 8th metal-oxide-semiconductor, described the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor forms the first current mirror, described the 5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor forms the second current mirror, the output of described the second comparison circuit and the 7th metal-oxide-semiconductor, the source electrode of the 8th metal-oxide-semiconductor is connected, the drain electrode of the drain electrode of described the 7th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, grid is connected, the drain electrode of the drain electrode of described the 8th metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, grid is connected, the source electrode of described the 3rd metal-oxide-semiconductor, the source ground of the 4th metal-oxide-semiconductor, described the 5th metal-oxide-semiconductor, the source electrode of the 6th metal-oxide-semiconductor connects operating voltage, the drain electrode of described the 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.
7. current stabilization control circuit as claimed in claim 1, it is characterized in that, when described first signal is load current, and when described comparison signal is the difference of the minimum value maximum in first signal in a period of time, described sampling comparison circuit comprises: the 3rd comparison circuit, the second control switch, the second comparison circuit, the positive input of described the 3rd comparison circuit is connected with the reverse input end of the second comparison circuit, and be connected with corresponding adaptation control circuit, one end of the reverse input end of described the 3rd comparison circuit and the second control switch, one end of the first electric capacity is connected with the positive input of the second comparison circuit, the output of described the 3rd comparison circuit is connected with the control end of the second control switch, the other end of described the second control switch is connected with operating voltage, the other end ground connection of described the first electric capacity, the output of described the second comparison circuit is for the Current Control benchmark of output adaptive control circuit.
8. the current stabilization control circuit as described in claim 4～7 any one, is characterized in that, the output of described sampling comparison circuit is parallel with the first filter capacitor.
9. current stabilization control circuit as claimed in claim 4, it is characterized in that, described sampling comparison circuit also comprises benchmark control circuit, described benchmark 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, by counter and sliding window averaging unit, obtain corresponding voltage control benchmark, and utilize the Current Control benchmark of the output output adaptive control circuit of described D/A converter.
10. current stabilization control circuit as claimed in claim 1, it is characterized in that, described adaptation control circuit comprises: the first control switch, the first current sampling resistor, the first comparison circuit, one end of described the first control switch is connected with corresponding load, the other end of described the first control switch is connected with the first current sampling resistor, the first input end of described the first comparison circuit is connected with the first current sampling resistor, the second input input current of described the first comparison circuit is controlled benchmark, the output of described the first comparison circuit is connected with the control end of the first control switch.
11. current stabilization control circuits as claimed in claim 1, is characterized in that, described setting threshold is fixed threshold or variable thresholding.
12. 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, and 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; The first control switch of described the 4th control switch, the second sampling resistor structure and adaptation control circuit, the first current sampling resistor are corresponding proportional respectively.
13. current stabilization control circuits as described in claim 11 or 12, is characterized in that, described variable thresholding changes with the change of load current, the first control switch characteristic or temperature.
14. current stabilization control circuits as claimed in claim 1, is characterized in that, a load correspondence has one or more adaptation control circuits that are connected with load and sampling comparison circuit.
15. 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.
16. 1 kinds of current stabilization control methods, is characterized in that, comprising:
Obtain the first signal of load, and by relatively obtaining the comparison signal of first signal in a period of time;
Described comparison signal and setting threshold are compared, and according to comparative result, output current is controlled benchmark;
Load current and Current Control benchmark are 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, by regulating the first control switch to reduce load current.
17. current stabilization control methods as claimed in claim 16, is characterized in that, when comparison signal is during higher than setting threshold, increase Current Control benchmark, when comparison signal is during lower than setting threshold, reduce Current Control benchmark.
18. current stabilization control methods as claimed in claim 16, is characterized in that, also comprise: according to the change of load current, the first control switch characteristic or temperature, regulate setting threshold.
19. current stabilization control methods as claimed in claim 16, it is characterized in that, described comparison signal is the maximum in first signal or the minimum value maximum in first signal poor in a period of time in the minimum value in first signal, a period of time in a period of time.
20. current stabilization control methods as claimed in claim 16, is characterized in that, described first signal is the voltage of load current, the voltage of load one end, the pressure drop of load, first control switch one end or the pressure drop between the leakage of the first control switch source.
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