CN103841728A - Multichannel load balancing steady flow control circuit, corresponding circuit combination and control method - Google Patents
Multichannel load balancing steady flow control circuit, corresponding circuit combination and control method Download PDFInfo
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- CN103841728A CN103841728A CN201410100001.3A CN201410100001A CN103841728A CN 103841728 A CN103841728 A CN 103841728A CN 201410100001 A CN201410100001 A CN 201410100001A CN 103841728 A CN103841728 A CN 103841728A
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Abstract
Provided are a multichannel load balancing steady flow control circuit, a corresponding circuit combination and a control method. First signals corresponding to loads of all channels are sampled through a sampling comparison circuit adopted by the multichannel load balancing steady flow control circuit, comparison signals of the first signals are obtained, the comparison signals are compared with a set threshold value, and according to a comparison result, current control references of all channels of self-adaption control circuits are adjusted at the same time. Load currents are compared with the current control references, the difference between the load currents corresponding to the loads of all the channels is reduced by adjusting the impedance of first control switches, when the impedance of the first control switches is too large, the sampling comparison circuit adjusts the current control references by comparing the set threshold value and the comparison signals, and the impedance of the first control switches corresponding to the loads of all the channels is reduced. Under the condition of maintaining the load current balance of the loads of all the channels, power consumption of the first control switches can be reduced as far as possible.
Description
Technical field
The present invention relates to Current Control Technology field, particularly the balanced current stabilization control circuit of a kind of multichannel loading, corresponding circuit combine and control method.
Background technology
Current source can provide numerical value to keep constant electric current to load, therefore having wide range of applications of current source.Wherein, LED driver is exactly a kind of typical current source, and LED driver can provide electric current for one or more LED.But in the time of described LED multi-path Incomplete matching, can make size of current difference corresponding to different LED, multichannel loading inequality fails to be convened for lack of a quorum affects the use of LED illumination.
Prior art conventionally adopts resistance to carry out current-sharing or adopts fixed current source to carry out current-sharing, but the poor effect of current-sharing and power consumption are large.
Summary of the invention
The problem that the present invention solves is to provide the balanced current stabilization control circuit of a kind of multichannel loading, corresponding circuit combines and control method, makes, the load current equilibrium in the case of maintaining the load of each road, to reduce the power consumption loss of the first control switch as far as possible.
For addressing the above problem, the embodiment of the present invention provides a kind of multichannel loading balanced current stabilization control circuit, comprising: power supply source, the multichannel loading being connected with power supply source, the adaptation control circuit being connected respectively with each road load, the sampling comparison circuit being connected with each road adaptation control circuit; First signal corresponding to described sampling comparison circuit Dui Ge road load sampled, by relatively obtaining the comparison signal of first signal, described comparison signal and setting threshold are compared, according to comparative result, export the Current Control benchmark of each road adaptation control circuit; Described adaptation control circuit is sampled to load current, described load current and Current Control benchmark are compared, by the impedance of the first control switch that regulates adaptation control circuit, the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit, by adjusting Current Control benchmark, diminishes the impedance of the first control switch corresponding to each road load.
Optionally, described comparison signal is the maximum difference between first signal corresponding to maximum, the load of Huo Ge road in minimum value, the first signal in first signal.
Optionally, the voltage of the pressure drop of the voltage of load current corresponding to described first signal Wei Ge road load, load one end, load, first control switch one end or the first control switch source pressure drop between leaking.
Optionally, 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 the respectively adaptation control circuit corresponding with each road load is connected, 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, and the output of described the second comparison circuit is exported the Current Control benchmark of each road adaptation control circuit.
Optionally, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when described comparison signal is the minimum value in first signal, described the first sample circuit comprises: the drain electrode of described the first metal-oxide-semiconductor respectively with the grid of the first metal-oxide-semiconductor, the drain electrode of each the tenth metal-oxide-semiconductor is connected, the drain electrode of described the second metal-oxide-semiconductor is connected with the drain and gate of the 6th metal-oxide-semiconductor, described the first metal-oxide-semiconductor is connected with the grid of the second metal-oxide-semiconductor, the source electrode of the source electrode of described the 5th metal-oxide-semiconductor and each the tenth metal-oxide-semiconductor, current source is connected, grid Yu Ge road load or first control switch of each the tenth metal-oxide-semiconductor are connected, the drain electrode of the drain electrode of described the 5th metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, grid is connected, the grid of described the 5th metal-oxide-semiconductor is connected with the grid of the 4th metal-oxide-semiconductor, the grid of described the 6th metal-oxide-semiconductor is connected with the grid of the 7th metal-oxide-semiconductor, the grid of the drain electrode of described the 7th metal-oxide-semiconductor and the 8th metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor is connected, described the 6th metal-oxide-semiconductor, the source electrode of the 7th metal-oxide-semiconductor, the drain electrode of the 8th metal-oxide-semiconductor is connected with operating voltage, described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, one end ground connection of the source electrode of the 4th metal-oxide-semiconductor and regulating resistance, the other end of described regulating resistance, the source electrode of the 8th metal-oxide-semiconductor is connected with output, described output is connected with the first input end of the second comparison circuit.
Optionally, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when maximum difference between first signal corresponding to described comparison signal Wei Ge road load, the first sample circuit comprises: electric current and voltage converting unit, difference electric current acquiring unit, maximum difference electric current acquiring unit, the voltage transitions that described electric current and voltage converting unit Jiang Congge road load is obtained becomes corresponding electric current, and be input to difference electric current acquiring unit, described difference electric current acquiring unit is by relatively obtaining the electric current of each road maximum the electric current difference of output and maximum current comparison, described maximum difference electric current acquiring unit is exported maximum electric current difference by the electric current difference of more each road load.
Optionally, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, the second control switch, each road load correspondence has first sample circuit, the second comparison circuit and the second control switch, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the control end of corresponding the second control switch, the first end of each the second control switch is connected with operating voltage, the second end of each the second control switch is by a regulating resistance ground connection, and the second end of described each the second control switch is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
Optionally, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, charge pump, each road load correspondence has first sample circuit, the second comparison circuit and charge pump, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the input of corresponding charge pump, each electric charge delivery side of pump is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
Optionally, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, the 3rd control switch, pull-down current source, pull-up current source, the first electric capacity, each road load correspondence has first sample circuit, the second comparison circuit, the 3rd control switch and pull-down current source, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the control end of corresponding the 3rd control switch, the first end of described the 3rd control switch is connected with the one end in corresponding pull-down current source, the other end ground connection in each pull-down current source, the second end of each the 3rd control switch and the one end in pull-up current source, one end of the first electric capacity, output is connected, the other end in described pull-up current source is connected with working power, the other end ground connection of described the first electric capacity.
Optionally, the output of described sampling comparison circuit is parallel with the first filter capacitor.
Optionally, in the time of the control end voltage of described first signal Wei Ge road the first control switch, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, many inputs and door, counter, sliding window averaging unit, D/A converter, each road load correspondence has first sample circuit, the second comparison circuit, and described many inputs and door, counter, sliding window averaging unit, D/A converter connects successively, and described many inputs are connected with the output of each the second comparison circuit with the input of door, obtain corresponding voltage control benchmark by counter and sliding window averaging unit, the output of described D/A converter is exported the Current Control benchmark of each road adaptation control circuit.
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 control benchmark of described the first comparison circuit, 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, in the time that described setting threshold is variable thresholding, described setting threshold acquisition cuicuit comprises: fixed bias, the 4th control switch, wherein one or more of the second sampling resistor, Feedback Current Source, the output of described Feedback Current Source and fixed bias, the 4th control switch or the second sampling resistor are connected, and fixed bias, the 4th control switch, the second sampling resistor random order is connected successively, the input of described Feedback Current Source obtains load current, described fixed bias, wherein one end of the 4th control switch or the second sampling resistor is 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.
Optionally, in the time that described setting threshold acquisition cuicuit comprises the 4th control switch, the second sampling resistor, the first control switch of described the 4th control switch, the second sampling resistor 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.
The present invention also provides a kind of multichannel loading balanced current stabilization control circuit combination, comprising: organize the parallel connection of the balanced current stabilization control circuit of multichannel loading, the Current Control benchmark of the balanced current stabilization control circuit of each group multichannel loading is all identical more.
The present invention also provides a kind of control method, comprising: obtain first signal corresponding to each road load, and by relatively obtaining the comparison signal of first signal; Described comparison signal and setting threshold are compared, according to comparative result, export the Current Control benchmark of each road adaptation control circuit; Load current is sampled, described load current and Current Control benchmark are compared, by regulating the impedance of the first control switch that the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit, by adjusting Current Control benchmark, diminishes the impedance of the first control switch corresponding to each road load.
Optionally, by increasing the impedance of the first control switch, reduce to some extent load current corresponding to each road load, the difference of load current corresponding to each road load is diminished.
Optionally, by increasing the impedance of the first control switch corresponding to the load of less impedance, reduce the impedance of the first control switch corresponding to the load of larger impedance, the difference of load current corresponding to each road load is diminished.
Optionally, when comparison signal is during higher than setting threshold, increase the Current Control benchmark of corresponding each road adaptation control circuit, improve the control voltage of the first control switch, the impedance of corresponding the first control switch is diminished; When comparison signal is during lower than setting threshold, reduce the Current Control benchmark of corresponding each road adaptation control circuit, reduce the control voltage of the first control switch, increase the impedance of the first control switch.
Optionally, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of corresponding each road adaptation control circuit, the control lower voltage of the first control switch, makes the impedance of corresponding the first control switch become large; When comparison signal is during lower than setting threshold, increase the Current Control benchmark of corresponding each road adaptation control circuit, by improving the control voltage of the first control switch, reduce the impedance of the first control switch.
Optionally, regulate setting threshold according to the change of load current, the first control switch characteristic or temperature.
Compared with prior art, the technical program has the following advantages:
Due to unequally loaded impedance difference, and by regulating the impedance of the first control switch, dwindle total impedance poor of the load of each road and the first control switch, the difference of the load current of each road load is diminished, make the load current-sharing of each road; Meanwhile, utilize setting threshold to control impedance magnitude corresponding to the first control switch, avoid the excessive power consumption of the first control switch loss that causes of impedance of the first control switch excessive, system power dissipation is excessive.
Accompanying drawing explanation
Fig. 1 is the structural representation of the balanced current stabilization control circuit of multichannel loading of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the balanced current stabilization control circuit of multichannel loading of one embodiment of the invention;
Fig. 3 is the circuit diagram of the first sample circuit of one embodiment of the invention;
Fig. 4 is the circuit structure diagram of the first sample circuit of one embodiment of the invention;
Fig. 5 is the circuit diagram of the sampling comparison circuit of one embodiment of the invention;
Fig. 6 is the circuit diagram of the sampling comparison circuit of one embodiment of the invention;
Fig. 7 is the circuit diagram of the sampling comparison circuit of one embodiment of the invention;
Fig. 8 is the circuit diagram of the sampling comparison circuit of one embodiment of the invention;
Fig. 9 is the circuit diagram of the setting threshold acquisition cuicuit of one embodiment of the invention.
Embodiment
Because the multichannel loading of current source is different loads, when impedance is different, or when different for its pressure drop of voltage source formula load, the load current of each road load can be not identical yet, therefore, the embodiment of the present invention provides the balanced current stabilization control circuit of a kind of multichannel loading and control method, utilize first signal corresponding to sampling comparison circuit Dui Ge road load to sample, by relatively obtaining the comparison signal of first signal, described comparison signal and setting threshold are compared, according to comparative result, regulate the Current Control benchmark of each road adaptation control circuit simultaneously; And utilize adaptation control circuit to sample to load current, described load current and Current Control benchmark are compared, regulate the impedance of the first control switch that the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit is by comparing setting threshold and comparison signal, adjust Current Control benchmark, the impedance of the first control switch corresponding to each road load is diminished.
By regulating the impedance of the first control switch to dwindle total impedance poor of the load of each road and the first control switch, the difference of the load current of each road load is diminished, make the load current-sharing of each road; Meanwhile, utilize setting threshold to control impedance magnitude corresponding to the first control switch, avoid the power consumption of the excessive loss that causes the first control switch of impedance of the first control switch excessive.
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, for the structural representation of the balanced current stabilization control circuit of a kind of multichannel loading of the embodiment of the present invention, comprising: power supply source 100, the multichannel loading 200, the adaptation control circuit 300 being connected respectively with each road load 200, the sampling comparison circuit 400 being connected with each road adaptation control circuit 300 that are connected with power supply source 100 respectively;
The first signal of described sampling comparison circuit 400Dui Ge road load 200 correspondences is sampled, by relatively obtaining the comparison signal of first signal, described comparison signal and setting threshold are compared, according to comparative result, export the Current Control benchmark of each road adaptation control circuit 300;
Described adaptation control circuit 300 is sampled to load current, described load current and Current Control benchmark are compared, by regulating the impedance of the first control switch that the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit is by comparing setting threshold and comparison signal, adjust Current Control benchmark, the impedance of the first control switch corresponding to each road load is diminished.
Described power supply source 100 is current source, and the total current of each road load current is stable, and described current source provides electric current for multiple loads.But owing to may not mating between each load, therefore each load current may be not identical.In other embodiments, can also a power supply source be a load supplying, described power supply source is current source or voltage source, owing to having deviation between each current source or voltage source, therefore also may there is the situation that each load current is not identical, the electric current of fractional load is excessive, and the electric current of fractional load is too small, affects systematic function.For this reason, need to adopt the balanced current stabilization control circuit of multichannel loading of the present invention and control method to come for load current current-sharing.
In other embodiments, described power supply source also comprises the second filter capacitor, utilizes described the second filter capacitor to carry out filtering to the curtage of output.
Described power supply source 100 can integrate with adaptation control circuit 300 and sampling comparison circuit 400, also can described load 200 integrate with adaptation control circuit 300 and sampling comparison circuit 400, also can separate with load 200, adaptation control circuit 300 and sampling comparison circuit 400 by described power supply source 100.
In the present embodiment, described power supply source 100 is connected with each load 200 respectively, and 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 described sampling comparison circuit 400Dui Ge road load 200 correspondences is sampled, corresponding load current, the load voltage of described first signal Wei Ge road load.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 two ends, load one end, adaptation control circuit 300 voltage of first control switch one end one wherein in the pressure drop at the first control switch two ends, adaptation control circuit 300.In the time that described the first control switch is metal-oxide-semiconductor, the voltage of described first control switch one end is source voltage, drain voltage or grid voltage.
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 first signal corresponding to maximum, the load of Huo Ge road in minimum value, the first signal in first signal, i.e. maximum difference between corresponding load current or the load voltage of the load current that described each road load is corresponding or load voltage minimum value, maximum or described each road load.
After described comparison signal and setting threshold compare, utilize described comparison signal can obtain the situation of each road load current, load voltage variation, and according to comparative result, export the Current Control benchmark of each road adaptation control circuit.
Described setting threshold can be fixed threshold or variable thresholding.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 each road adaptation control circuit, when comparison signal is during lower than setting threshold, reduce the Current Control benchmark of each road adaptation control circuit.
In another embodiment, also can work as comparison signal lower than setting threshold time, increase the Current Control benchmark of each road adaptation control circuit, when comparison signal is when in setting threshold, reduce the Current Control benchmark of each road adaptation control circuit.
Therein in an embodiment, when load voltage corresponding to described first signal Wei Ge road load, and when the minimum value of load voltage corresponding to described comparison signal Wei Ge road load, 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 each road adaptation control circuit, when comparison signal is during lower than setting threshold, reduce the Current Control benchmark of each road adaptation control circuit.
In another embodiment, when load current corresponding to described first signal Wei Ge road load, and when the maximum of load current corresponding to described comparison signal Wei Ge road load, the difference of minimum value, by the difference of the maximum of described load current, minimum value is compared with corresponding setting threshold, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of each road adaptation control circuit, when comparison signal is during lower than setting threshold, increase the Current Control benchmark of each road adaptation control circuit.
Described adaptation control circuit 300 is corresponding one by one with load 200, and the circuit structure of each adaptation control circuit 300 is identical, and the connection between described adaptation control circuit 300 and load 200, sampling comparison circuit 400 is identical.
Described adaptation control circuit 300 is sampled to load current, and described load current and Current Control benchmark are compared.Regulate respectively the impedance of each the first control switch according to Current Control benchmark, can dwindle total impedance poor of the load of each road and the first control switch, the difference of the load current of each road load is diminished, make the load current-sharing of each road.
Simultaneously, in the time that the impedance of the first control switch is too high, utilize described sampling comparison circuit to obtain comparison signal, utilize described comparison signal can judge that whether the impedance of the first control switch is too high, by comparing setting threshold and comparison signal, adjust Current Control benchmark, the impedance of the first control switch corresponding to each road load is diminished.In the time that the impedance of the first control switch is excessive, too much energy consumption is consumed at the first control switch, can improve the power consumption of current source, therefore by the reasonably impedance of the first control switch, making can be in the case of the load current equilibrium that maintains the load of each road, reduce the power consumption of the first control switch as far as possible, thereby reduce the power consumption of current source.
Please refer to Fig. 2, is the circuit diagram of the balanced current stabilization control circuit of the multichannel loading 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 control benchmark of described the first comparison circuit 320, 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 the impedance between grid voltage control NMOS pipe source-drain electrode.Meanwhile, at other control switchs of the present invention, for example the second control switch, the 3rd 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.
In the present embodiment, 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 the respectively adaptation control circuit corresponding with each road load 200 300 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 described the first comparison circuit 320, be used for to the first comparison circuit 320 output current control benchmark.
Described the first sample circuit 410 is sampled for the first signal of Dui Ge road load 200 correspondences, 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, is specifically connected with grid, source electrode, the drain electrode of the first control switch 310, thereby the current potential 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 voltage at the first control switch 310 two ends is sampled.
Described the first sample circuit 410 also can be connected with load 200 both ends or one end, thereby the voltage to load 200 two ends or the current potential of one end are sampled.
Described the first sample circuit 410 can also be connected with the both ends or one end of the first sample circuit, thereby first voltage at sample circuit two ends or the current potential of one end are sampled.
Therein in an embodiment, please refer to Fig. 3, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when described comparison signal is the minimum value in first signal, described the first sample circuit comprises: the drain electrode of described the first metal-oxide-semiconductor M1 respectively with the grid of the first metal-oxide-semiconductor M1, the drain electrode of each the tenth metal-oxide-semiconductor M10 is connected, the drain electrode of described the second metal-oxide-semiconductor M2 is connected with the drain and gate of the 6th metal-oxide-semiconductor M6, described the first metal-oxide-semiconductor M1 is connected with the grid of the second metal-oxide-semiconductor M2, the source electrode of the source electrode of described the 5th metal-oxide-semiconductor M5 and each the tenth metal-oxide-semiconductor M10, current source is connected, grid Yu Ge road load or the first control switch of each the tenth metal-oxide-semiconductor M10 are connected, the drain electrode of the drain electrode of described the 5th metal-oxide-semiconductor M5 and the 3rd metal-oxide-semiconductor M3, grid is connected, the grid of described the 5th metal-oxide-semiconductor M5 is connected with the grid of the 4th metal-oxide-semiconductor M4, the grid of described the 6th metal-oxide-semiconductor M6 is connected with the grid of the 7th metal-oxide-semiconductor M7, the grid of the drain electrode of described the 7th metal-oxide-semiconductor M7 and the 8th metal-oxide-semiconductor M8, the drain electrode of the 4th metal-oxide-semiconductor M4 is connected, described the 6th metal-oxide-semiconductor M6, the source electrode of the 7th metal-oxide-semiconductor M7, the drain electrode of the 8th metal-oxide-semiconductor M8 is connected with operating voltage, described the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, one end ground connection of the source electrode of the 4th metal-oxide-semiconductor M4 and regulating resistance R1, the other end of described regulating resistance R1, the source electrode of the 8th metal-oxide-semiconductor M8 is connected with output, described output end vo ut is connected with the first input end of the second comparison circuit.
In another embodiment, please refer to Fig. 4, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when maximum difference between first signal corresponding to described comparison signal Wei Ge road load, the first sample circuit comprises: electric current and voltage converting unit 411, difference electric current acquiring unit 412, maximum difference electric current acquiring unit 413, the voltage transitions that described electric current and voltage converting unit 411Jiang Congge road load is obtained becomes corresponding electric current, and be input to difference electric current acquiring unit 412, described difference electric current acquiring unit 412 is by relatively obtaining the electric current of each road maximum the electric current difference of output and maximum current comparison, described maximum difference electric current acquiring unit 413 is exported maximum electric current difference by the electric current difference of more each road load.
In another embodiment, please refer to Fig. 5, described sampling comparison circuit 400 comprises: the first sample circuit 4101, setting threshold acquisition cuicuit 4201, the second comparison circuit 4301, the second control switch 4401, each road load correspondence has first sample circuit 4101, the second comparison circuit 4301 and the second control switch 4401, 4101 one end of described the first sample circuit are connected with corresponding adaptation control circuit, the other end of described the first sample circuit 4101 is connected with the first input end of corresponding the second comparison circuit 4301, one end of described setting threshold acquisition cuicuit 4201 is connected with the second input of each the second comparison circuit 4301, the output of described the second comparison circuit 4301 is connected with the control end of corresponding the second control switch 4401, the first end of each the second control switch 4401 is connected with operating voltage, the second end of each the second control switch 4401 is by a regulating resistance ground connection, and the second end of described each the second control switch 4401 is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
In another embodiment, please refer to Fig. 6, in the time of the control end voltage of described first signal Wei Ge road the first control switch, described sampling comparison circuit comprises: the first sample circuit 4102, setting threshold acquisition cuicuit 4202, the second comparison circuit 4302, many inputs and door 4502, counter 4602, sliding window averaging unit 4702, D/A converter 4802, each road load correspondence has first sample circuit 4102, the second comparison circuit 4302, and described many inputs and door 4502, counter 4602, sliding window averaging unit 4702, D/A converter 4802 connects successively, and described many inputs are connected with the output of each the second comparison circuit 4302 with the input of door 4502, obtain corresponding voltage control benchmark by counter 4602 and sliding window averaging unit 4702, and the output that utilizes described D/A converter 4802 is exported the Current Control benchmark of each road adaptation control circuit.
In another embodiment, please refer to Fig. 7, described sampling comparison circuit comprises: the first sample circuit 4103, setting threshold acquisition cuicuit 4203, the second comparison circuit 4303, charge pump 4403, each road load correspondence has first sample circuit 4103, the second comparison circuit 4303 and charge pump 4403, one end of described the first sample circuit 4103 is connected with corresponding adaptation control circuit, the other end of described the first sample circuit 4103 is connected with the first input end of corresponding the second comparison circuit 4303, one end of described setting threshold acquisition cuicuit 4203 is connected with the second input of each the second comparison circuit 4303, the output of described the second comparison circuit 4303 is connected with the input of corresponding charge pump 4403, the output of each charge pump 4403 is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
In another embodiment, please refer to Fig. 8, described sampling comparison circuit comprises: the first sample circuit 4104, setting threshold acquisition cuicuit 4204, the second comparison circuit 4304, the 3rd control switch 4404, pull-down current source 4504, pull-up current source 4604, the first electric capacity 4704, each road load correspondence has first sample circuit 4104, the second comparison circuit 4304, the 3rd control switch 4404 and pull-down current source 4504, one end of described the first sample circuit 4104 is connected with corresponding adaptation control circuit, the other end of described the first sample circuit 4104 is connected with the first input end of corresponding the second comparison circuit 4304, one end of described setting threshold acquisition cuicuit 4204 is connected with the second input of each the second comparison circuit 4304, the output of described the second comparison circuit 4304 is connected with the control end of corresponding the 3rd control switch 4404, the first end of described the 3rd control switch 4404 is connected with the one end in corresponding pull-down current source 4504, the other end ground connection in each pull-down current source 4504, the second end of each the 3rd control switch 4404 and the one end in pull-up current source 4604, one end of the first electric capacity 4704, output is connected, the other end in described pull-up current source 4604 is connected with working power, the other end ground connection of described the first electric capacity 4704.
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. 9, 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 structure, voltage and the adaptation control circuit of described the 4th control switch 423, the second sampling resistor 424, the structure of the first current sampling resistor 330, voltage are corresponding proportional respectively.In other embodiments, the control end voltage of described the 4th control switch and the first control switch also can be disproportionate.
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 order of connection of the fixed bias of described setting threshold acquisition cuicuit, the 4th control switch, the second sampling resistor can convert.
In other embodiments, the output of described Feedback Current Source can also be connected with fixed bias, the 4th control switch, the second sampling resistor one of them or two, and the optional of fixed bias, the 4th control switch or the second sampling resistor two ends is a bit connected with the second input of the second comparison circuit as output, for generation of setting threshold.
In other embodiments, the output of described sampling comparison circuit 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.
The present invention also provides a kind of multichannel loading balanced current stabilization control circuit combination, comprise: the balanced current stabilization control circuit of the multichannel loading parallel connection that many groups are described, the second input of the first comparison circuit that the balanced current stabilization control circuit of each group multichannel loading is corresponding all connects, make the Current Control benchmark of the balanced current stabilization control circuit of each group multichannel loading all identical, thereby can realize all current-sharings of load current of the multichannel loading of many groups.
The balanced current stabilization control circuit of multichannel loading based on the invention described above embodiment, the embodiment of the present invention also provides a kind of control method, specifically comprises:
Step S101, obtains first signal corresponding to each road load, and by relatively obtaining the comparison signal of first signal;
Step S102, compares described comparison signal and setting threshold, according to comparative result, exports the Current Control benchmark of each road adaptation control circuit;
Step S103, load current is sampled, described load current and Current Control benchmark are compared, by regulating the impedance of the first control switch, the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit, by adjusting Current Control benchmark, diminishes the impedance of the first control switch corresponding to each road load.
Corresponding load current or the load voltage of described first signal Wei Ge road load.Described comparison signal is the maximum difference between first signal corresponding to maximum, the load of Huo Ge road in minimum value, the first signal in first signal.
In the present embodiment, by increasing the impedance of each the first control switch, reduce to some extent load current corresponding to each road load, can dwindle the poor of total impedance between the load of each road and the first control switch, the difference of load current corresponding to each road load is diminished.
Therein in an embodiment, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of corresponding each road adaptation control circuit, reduce the control voltage of the first control switch, make the impedance of the first control switch become large, the difference of the load current of each road load is diminished, make the load current-sharing of each road.When comparison signal is during lower than setting threshold, the impedance that shows the first control switch is excessive, the Current Control benchmark of maximum corresponding each road adaptation control circuit, by improving the control voltage of the first control switch, reduce the impedance of the first control switch, thereby reduce the power loss of the first control switch, be conducive to reduce the gross power of current source, be conducive to reduce energy consumption.
In another embodiment, also can work as comparison signal lower than setting threshold time, reduce the Current Control benchmark of corresponding each road adaptation control circuit, reduce the control voltage of the first control switch, make the impedance of the first control switch become large, the difference of the load current of each road load is diminished, make the load current-sharing of each road.When comparison signal is during higher than setting threshold, the impedance that shows the first control switch is excessive, increase the Current Control benchmark of each road adaptation control circuit simultaneously, by improving the control voltage of the first control switch, reduce the impedance of the first control switch, thereby reduce the power loss of the first control switch, be conducive to reduce the gross power of current source, be conducive to reduce energy consumption.
In other embodiments, increase the impedance of the first control switch corresponding to the load of less impedance, reduce the impedance of the first control switch corresponding to the load of larger impedance, can dwindle the poor of total impedance between the load of each road and the first control switch, the difference of load current corresponding to each road load is diminished.When comparison signal is during lower than setting threshold, the impedance that shows the first control switch is excessive, increase the Current Control benchmark of each road adaptation control circuit, by improving the control voltage of the first control switch, reduce the impedance of the first control switch, thereby reduce the power loss of the first control switch, be conducive to reduce the gross power of current source, be conducive to reduce energy consumption.
Described setting threshold is fixed threshold or variable thresholding, in the time that described setting threshold is variable thresholding, regulates setting threshold according to the change of load current, the first control switch characteristic or temperature.
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 variation 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 (23)
1. the balanced current stabilization control circuit of multichannel loading, is characterized in that, comprising: power supply source and power supply source
The multichannel loading being connected, the adaptation control circuit being connected respectively with each road load, with each road
The sampling comparison circuit that adaptation control circuit is connected;
First signal corresponding to described sampling comparison circuit Dui Ge road load sampled, by relatively obtaining the comparison signal of first signal, described comparison signal and setting threshold are compared, according to comparative result, export the Current Control benchmark of each road adaptation control circuit;
Described adaptation control circuit is sampled to load current, described load current and Current Control benchmark are compared, by the impedance of the first control switch that regulates adaptation control circuit, the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit, by adjusting Current Control benchmark, diminishes the impedance of the first control switch corresponding to each road load.
2. the balanced current stabilization control circuit of multichannel loading as claimed in claim 1, is characterized in that, described comparison signal is the maximum difference between first signal corresponding to maximum, the load of Huo Ge road in minimum value, the first signal in first signal.
3. the balanced current stabilization control circuit of multichannel loading as claimed in claim 1, it is characterized in that the pressure drop between leaking of the voltage of the voltage of load current corresponding to described first signal Wei Ge road load, load one end, the pressure drop of load, first control switch one end or the first control switch source.
4. the balanced current stabilization control circuit of multichannel loading 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 the respectively adaptation control circuit corresponding with each road load is connected, 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, and the output of described the second comparison circuit is exported the Current Control benchmark of each road adaptation control circuit.
5. the balanced current stabilization control circuit of multichannel loading as claimed in claim 4, it is characterized in that, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when described comparison signal is the minimum value in first signal, described the first sample circuit comprises: the drain electrode of described the first metal-oxide-semiconductor respectively with the grid of the first metal-oxide-semiconductor, the drain electrode of each the tenth metal-oxide-semiconductor is connected, the drain electrode of described the second metal-oxide-semiconductor is connected with the drain and gate of the 6th metal-oxide-semiconductor, described the first metal-oxide-semiconductor is connected with the grid of the second metal-oxide-semiconductor, the source electrode of the source electrode of described the 5th metal-oxide-semiconductor and each the tenth metal-oxide-semiconductor, current source is connected, grid Yu Ge road load or first control switch of each the tenth metal-oxide-semiconductor are connected, the drain electrode of the drain electrode of described the 5th metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, grid is connected, the grid of described the 5th metal-oxide-semiconductor is connected with the grid of the 4th metal-oxide-semiconductor, the grid of described the 6th metal-oxide-semiconductor is connected with the grid of the 7th metal-oxide-semiconductor, the grid of the drain electrode of described the 7th metal-oxide-semiconductor and the 8th metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor is connected, described the 6th metal-oxide-semiconductor, the source electrode of the 7th metal-oxide-semiconductor, the drain electrode of the 8th metal-oxide-semiconductor is connected with operating voltage, described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, one end ground connection of the source electrode of the 4th metal-oxide-semiconductor and regulating resistance, the other end of described regulating resistance, the source electrode of the 8th metal-oxide-semiconductor is connected with output, described output is connected with the first input end of the second comparison circuit.
6. the balanced current stabilization control circuit of multichannel loading as claimed in claim 4, it is characterized in that, when the pressure drop of load corresponding to described first signal Wei Ge road load, pressure drop between the first control switch source leakage, the voltage of first control switch one end corresponding to each road load, the voltage Huo Ge road load current of load one end, and when maximum difference between first signal corresponding to described comparison signal Wei Ge road load, the first sample circuit comprises: electric current and voltage converting unit, difference electric current acquiring unit, maximum difference electric current acquiring unit, the voltage transitions that described electric current and voltage converting unit Jiang Congge road load is obtained becomes corresponding electric current, and be input to difference electric current acquiring unit, described difference electric current acquiring unit is by relatively obtaining the electric current of each road maximum the electric current difference of output and maximum current comparison, described maximum difference electric current acquiring unit is exported maximum electric current difference by the electric current difference of more each road load.
7. the balanced current stabilization control circuit of multichannel loading 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, the second control switch, each road load correspondence has first sample circuit, the second comparison circuit and the second control switch, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the control end of corresponding the second control switch, the first end of each the second control switch is connected with operating voltage, the second end of each the second control switch is by a regulating resistance ground connection, and the second end of described each the second control switch is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
8. the balanced current stabilization control circuit of multichannel loading 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, charge pump, each road load correspondence has first sample circuit, the second comparison circuit and charge pump, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the input of corresponding charge pump, each electric charge delivery side of pump is as the output of sampling comparison circuit, export the Current Control benchmark of each road adaptation control circuit.
9. the balanced current stabilization control circuit of multichannel loading 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, the 3rd control switch, pull-down current source, pull-up current source, the first electric capacity, each road load correspondence has first sample circuit, the second comparison circuit, the 3rd control switch and pull-down current source, one end of described the first sample circuit is connected with corresponding adaptation control circuit, the other end of described the first sample circuit is connected with the first input end of corresponding the second comparison circuit, one end of described setting threshold acquisition cuicuit is connected with the second input of each the second comparison circuit, the output of described the second comparison circuit is connected with the control end of corresponding the 3rd control switch, the first end of described the 3rd control switch is connected with the one end in corresponding pull-down current source, the other end ground connection in each pull-down current source, the second end of each the 3rd control switch and the one end in pull-up current source, one end of the first electric capacity, output is connected, the other end in described pull-up current source is connected with working power, the other end ground connection of described the first electric capacity.
10. the balanced current stabilization control circuit of the multichannel loading as described in claim 4～9 any one, is characterized in that, the output of described sampling comparison circuit is parallel with the first filter capacitor.
The balanced current stabilization control circuit of 11. multichannel loading as claimed in claim 1, it is characterized in that, in the time of the control end voltage of described first signal Wei Ge road the first control switch, described sampling comparison circuit comprises: the first sample circuit, setting threshold acquisition cuicuit, the second comparison circuit, many inputs and door, counter, sliding window averaging unit, D/A converter, each road load correspondence has first sample circuit, the second comparison circuit, and described many inputs and door, counter, sliding window averaging unit, D/A converter connects successively, and described many inputs are connected with the output of each the second comparison circuit with the input of door, obtain corresponding voltage control benchmark by counter and sliding window averaging unit, the output of described D/A converter is exported the Current Control benchmark of each road adaptation control circuit.
The balanced current stabilization control circuit of 12. multichannel loading 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 control benchmark of described the first comparison circuit, the output of described the first comparison circuit is connected with the control end of the first control switch.
The balanced current stabilization control circuit of 13. multichannel loading as claimed in claim 1, is characterized in that, described setting threshold is fixed threshold or variable thresholding.
The balanced current stabilization control circuit of 14. multichannel loading as claimed in claim 13, it is characterized in that, in the time that described setting threshold is variable thresholding, described setting threshold acquisition cuicuit comprises: fixed bias, the 4th control switch, wherein one or more of the second sampling resistor, Feedback Current Source, the output of described Feedback Current Source and fixed bias, the 4th control switch or the second sampling resistor are connected, and fixed bias, the 4th control switch, the second sampling resistor random order is connected successively, the input of described Feedback Current Source obtains load current, described fixed bias, wherein one end of the 4th control switch or the second sampling resistor is 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 balanced current stabilization control circuit of 15. multichannel loading as claimed in claim 13, it is characterized in that, in the time that described setting threshold acquisition cuicuit comprises the 4th control switch, the second sampling resistor, the first control switch of described the 4th control switch, the second sampling resistor and adaptation control circuit, the first current sampling resistor are corresponding proportional respectively.
The balanced current stabilization control circuit of 16. multichannel loadings as described in claim 13,14 or 15, is characterized in that, described variable thresholding changes with the change of load current, the first control switch characteristic or temperature.
17. 1 kinds of balanced current stabilization control circuit combinations of multichannel loading, is characterized in that, comprising: organize the parallel connection of the balanced current stabilization control circuit of multichannel loading as claimed in claim 1, the Current Control benchmark of the balanced current stabilization control circuit of each group multichannel loading is all identical more.
18. 1 kinds of control methods, is characterized in that, comprising:
Obtain first signal corresponding to each road load, and by relatively obtaining the comparison signal of first signal;
Described comparison signal and setting threshold are compared, according to comparative result, export the Current Control benchmark of each road adaptation control circuit;
Load current is sampled, described load current and Current Control benchmark are compared, by regulating the impedance of the first control switch that the difference of load current corresponding to each road load is diminished, and in the time that the impedance of the first control switch is excessive, described sampling comparison circuit, by adjusting Current Control benchmark, diminishes the impedance of the first control switch corresponding to each road load.
19. control methods as claimed in claim 18, is characterized in that, by increasing the impedance of the first control switch, reduce to some extent load current corresponding to each road load, and the difference of load current corresponding to each road load is diminished.
20. control methods as claimed in claim 18, it is characterized in that, by increasing the impedance of the first control switch corresponding to the load of less impedance, reduce the impedance of the first control switch corresponding to the load of larger impedance, the difference of load current corresponding to each road load is diminished.
21. control methods as claimed in claim 18, it is characterized in that, when comparison signal is during higher than setting threshold, increase the Current Control benchmark of corresponding each road adaptation control circuit, improve the control voltage of the first control switch, the impedance of corresponding the first control switch is diminished; When comparison signal is during lower than setting threshold, reduce the Current Control benchmark of corresponding each road adaptation control circuit, reduce the control voltage of the first control switch, increase the impedance of the first control switch.
22. control methods as claimed in claim 18, it is characterized in that, when comparison signal is during higher than setting threshold, reduce the Current Control benchmark of corresponding each road adaptation control circuit, the control lower voltage of the first control switch, makes the impedance of corresponding the first control switch become large; When comparison signal is during lower than setting threshold, increase the Current Control benchmark of corresponding each road adaptation control circuit, by improving the control voltage of the first control switch, reduce the impedance of the first control switch.
23. control methods as claimed in claim 18, is characterized in that, regulate setting threshold according to the change of load current, the first control switch characteristic or temperature.
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