CN103096567A - Multi-channel current control circuit and control method - Google Patents
Multi-channel current control circuit and control method Download PDFInfo
- Publication number
- CN103096567A CN103096567A CN2011103490282A CN201110349028A CN103096567A CN 103096567 A CN103096567 A CN 103096567A CN 2011103490282 A CN2011103490282 A CN 2011103490282A CN 201110349028 A CN201110349028 A CN 201110349028A CN 103096567 A CN103096567 A CN 103096567A
- Authority
- CN
- China
- Prior art keywords
- parallel branch
- current
- resistance
- control circuit
- reference signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a multi-channel current control circuit and a multi-channel current control method. The multi-channel current control circuit and the multi-channel current control method are applicable to parallel branches, and the number of the parallel branches is n. Each parallel branch comprises a plurality of loads which are connected in series, an impedance adjustable pipe and a current sampling circuit. Each parallel branch corresponds to a current control circuit. A constant flow source provides electricity for the parallel branches, and the number of the parallel branches is n. An output current of the constant flow source is collected to serve as a total current sampled signal, and the total current sampled signal is directly or indirectly served as a reference signal of the parallel branches. Each current control circuit enables the current of a present parallel branch to reach to a current set by the reference signal of the present parallel branch by controlling impedance adjustable pipe which is connected in series in the parallel branch. The reference signal of the parallel branch changes along with changes of the total current sampled signal, and when the output current of the constant flow source changes, the current of the parallel branch is distributed along with the reference signal produced by the output current of the constant flow source. The parallel branch provided by the multi-channel current control circuit and the multi-channel current control method does not include a direct current/direct current (DC/DC) constant current circuit, and the multi-channel current control circuit and the multi-channel current control method are simple in structure and low in cost.
Description
Technical field
The present invention relates to the LED lighting technical field, particularly a kind of Multi-path electricity flow control circuit and control method.
Background technology
For the application that the LED multiple constant current is controlled, the most frequently used scheme is: constant voltage module+multichannel non-isolation DC/DC constant-current circuit (as the BUCK circuit).
Referring to Fig. 1, this figure is the schematic diagram that in prior art, multipath LED constant current is controlled.
The output of constant voltage module 1000 is as the input of multichannel non-isolation DC/DC constant-current circuit 2000, and every road non-isolation DC/DC constant-current circuit 2000 is done separately constant current and controlled, and is easy to guarantee the current-sharing of multichannel output current.But because every road non-isolation DC/DC constant-current circuit 2000 needs an independent DC/DC converter of controlling, so circuit structure is complicated, and cost is high.
Therefore, those skilled in the art's technical issues that need to address are to provide a kind of Multi-path electricity flow control circuit, and circuit structure is simple, and cost is low.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Multi-path electricity flow control circuit and control method, and circuit structure is simple, and cost is low.
The invention provides a kind of Multi-path electricity flow control circuit, be applicable to n road parallel branch, each parallel branch comprises a plurality of loads of series connection, an impedance adjustable tube and a current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source; N 〉=1;
The total current sample circuit for the total current of the described constant-current source of sampling, produces the total current sampled signal;
Reference signal produces circuit, is used for described total current sampled signal directly as the reference signal of each parallel branch, or is converted to the reference signal of each parallel branch; The reference signal of each parallel branch equates or is unequal;
Described current control circuit, be used for to receive the current signal of this parallel branch that the current sampling circuit of this parallel branch gathers, and receive the described reference signal of this parallel branch, current signal and the described reference signal of this parallel branch are compared, control impedance adjustable tube in this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting;
Described impedance adjustable tube, voltage or the size of current of the control end by the control group adjustable tube can change the impedance magnitude at the another two ends of impedance adjustable tube.
Preferably, described total current sample circuit is the total current sampling resistor, and described total current sampling resistor is connected between the negative terminal of the negative output terminal of described constant-current source and parallel branch, and the positive output end of described constant-current source connects the anode of each parallel branch.
Preferably, the total current sampled signal that produces when described total current sample circuit is during directly as the reference signal of each parallel branch, and described current control circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance, compensating network and the first amplifier;
The inverting input of the first amplifier is by the 5th resistance of series connection and the negative output terminal of the 3rd resistance connection constant-current source; The inverting input of the first amplifier is by the 5th resistance of series connection and the output of the current sampling circuit of the 4th resistance connection parallel branch;
Be connected with compensating network between the output of the first amplifier and inverting input;
The in-phase input end ground connection of the first amplifier;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
Preferably, the total current sampled signal that produces when described total current sample circuit is during directly as the reference signal of each parallel branch, and described current control circuit comprises: the 3rd resistance, the 4th resistance and the first amplifier;
The inverting input of the first amplifier connects the negative output terminal of constant-current source by the 3rd resistance, the inverting input of the first amplifier connects the output of the current sampling circuit of parallel branch by the 4th resistance;
The in-phase input end ground connection of the first amplifier;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
Preferably, also comprise open loop protection circuit, this open loop protection circuit comprises n-1 protection branch road that is connected in parallel on described total current sampling resistor, and each protection branch road comprises a resistance and switch of series connection;
When all parallel branches all work, the equal conducting of all switches in open loop protection circuit; When one tunnel parallel branch open circuit was arranged, a switch of controlling in open loop protection circuit disconnected.
Preferably, described reference signal generation circuit comprises: the 6th resistance, the 7th resistance, the 8th resistance and the second amplifier;
The in-phase input end of the second amplifier connects the negative terminal of parallel branch by the 7th resistance;
The inverting input of the second amplifier connects the negative output terminal of constant-current source by the 6th resistance, the inverting input of the second amplifier connects the output of the second amplifier by the 8th resistance simultaneously;
The output of the second amplifier connects the input of the current control circuit in each parallel branch.
Preferably, described current control circuit comprises: the first amplifier, compensating network and the 9th resistance;
The in-phase input end of the first amplifier connects the output of described the second amplifier as the input of current control circuit;
The inverting input of the first amplifier connects the output of the current sampling circuit in parallel branch by the 9th resistance;
The inverting input of the first amplifier connects the output of the first amplifier by compensating network;
The output of the first amplifier connects the control end of the impedance switch pipe in parallel branch.
Preferably, described current control circuit comprises: the first amplifier;
The in-phase input end of the first amplifier connects the output of described the second amplifier as the input of current control circuit;
The inverting input of the first amplifier connects the output of the current sampling circuit in parallel branch;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
Preferably, described current sampling circuit is sampling resistor.
Preferably, the reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
The present invention also provides a kind of Multi-path electricity method of flow control, is applicable to n road parallel branch, and each parallel branch comprises a plurality of loads of series connection, an impedance adjustable tube and a current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source;
Described current control circuit compares the current signal of this parallel branch and the reference signal of this parallel branch, control the impedance adjustable tube of this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting; Described reference signal directly obtains or changes rear acquisition by the total current sampled signal of constant-current source, and the reference signal of each parallel branch equates or be unequal;
Described impedance adjustable tube, voltage or the size of current of the control end of adjusting by control group can change the impedance magnitude at the another two ends of impedance adjustable tube.
Preferably,
Reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
Compared with prior art, the present invention has the following advantages:
Multi-path electricity flow control circuit provided by the invention and control method gather the output current of constant-current source, as the total current sampled signal, with the total current sampled signal directly or indirectly as the reference signal of parallel branch; Electric current under the current control circuit of each parallel branch is set by the reference signal of controlling the impedance adjustable tube of connecting on this parallel branch and making the electric current of this parallel branch reach this parallel branch.Because the variation along with the total current sampled signal of the reference signal of each parallel branch changes, therefore, when the output current of constant-current source changes, the reference signal that the electric current that still can make parallel branch produces along with the output current of constant-current source and distributing.Parallel branch in circuit provided by the invention and method does not comprise the DC/DC constant-current circuit, and therefore simple in structure, cost is low.
Description of drawings
Fig. 1 is the schematic diagram that in prior art, multipath LED constant current is controlled;
Fig. 2 is Multi-path electricity flow control circuit embodiment provided by the invention one schematic diagram;
Fig. 3 is the embodiment schematic diagram of the reference signal of each parallel branch provided by the invention when not identical;
Fig. 4 is the embodiment schematic diagram of the reference signal of each parallel branch provided by the invention when identical;
Fig. 5 is embodiment two schematic diagrames of Multi-path electricity flow control circuit provided by the invention;
Fig. 6 is embodiment three schematic diagrames of Multi-path electricity flow control circuit provided by the invention;
Fig. 7 is embodiment four schematic diagrames of Multi-path electricity flow control circuit provided by the invention;
Fig. 8 is embodiment five schematic diagrames of Multi-path electricity flow control circuit provided by the invention;
Fig. 9 is embodiment six schematic diagrames of Multi-path electricity flow control circuit provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Referring to Fig. 2, this figure is Multi-path electricity flow control circuit embodiment provided by the invention one schematic diagram.
The Multi-path electricity flow control circuit that the present embodiment provides, be applicable to n road parallel branch, respectively A1, A2 ... An, each parallel branch comprises a plurality of loads (as a plurality of LED of the series connection in Fig. 2) of series connection, impedance adjustable tube (S1, the S2 in each parallel branch for example ... Sn) and one current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source 100;
Total current sample circuit (not shown in FIG.), the total current for described constant-current source 100 outputs of sampling produces the total current sampled signal;
Reference signal produces circuit (not shown in FIG.), is used for described total current sampled signal directly as reference signal (V1, the V2 of each parallel branch ... or be converted to the reference signal of each parallel branch Vn); It (is V1=V2=that the reference signal of each parallel branch equates ...=Vn) or unequal;
Described current control circuit, be used for to receive the current signal of this parallel branch that the current sampling circuit of this parallel branch gathers, and receive the described reference signal of this parallel branch, current signal and the described reference signal of this parallel branch are compared, control impedance adjustable tube in this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting;
For example, the first parallel branch, reference signal is V1, the current sampling signal of this parallel branch is the voltage on sampling resistor Rs1, the voltage that current control circuit 1 compares on V1 and sampling resistor Rs1, according to comparative result, control the impedance adjustable tube S1 on this parallel branch, so that the electric current on the first parallel branch A1 changes.Other parallel branch operation principles are identical, do not repeat them here.
Described impedance adjustable tube, voltage or the size of current of the control end by the control group adjustable tube can change the impedance magnitude at the another two ends of impedance adjustable tube.
For example, current control circuit 1 can change the impedance magnitude that S1 is connected on the two ends in A1, thereby the electric current on A1 is adjusted by the voltage of adjustment impedance adjustable tube S1 control end or the size of electric current.
Need to prove, described impedance adjustable tube can be metal-oxide-semiconductor, also can be triode, and when the impedance adjustable tube was metal-oxide-semiconductor, its control end was grid, and another two ends are source electrode and drain electrode; When the impedance adjustable tube was triode, its control end was base stage, and another two ends are emitter and collector.The impedance adjustable tube of using in the embodiment of the present invention works in the range of linearity, namely by regulating voltage or the electric current of control end, the impedance magnitude that can regulate another two ends.
Multi-path electricity flow control circuit provided by the invention gathers the output current of constant-current source, as the total current sampled signal, with the total current sampled signal directly or indirectly as the reference signal of parallel branch; Electric current under the current control circuit of each parallel branch is set by the reference signal of controlling the impedance adjustable tube of connecting on this parallel branch and making the electric current of this parallel branch reach this parallel branch.Because the variation along with the total current sampled signal of the reference signal of each parallel branch changes, therefore, when the output current of constant-current source changes, the reference signal that the electric current that still can make parallel branch produces along with the output current of constant-current source and distributing.Parallel branch in circuit provided by the invention and method does not comprise the DC/DC constant-current circuit, and therefore simple in structure, cost is low.
Need to prove, the current sampling circuit in the embodiment of the present invention on each parallel branch can be each sampling resistor, and as shown in Figure 2, the sampling resistor in A1 is Rs1, and the sampling resistor in A2 is Rs2, the like, the sampling resistor in An is Rsn.
Need to prove, during directly as reference signal, described reference signal produces circuit does not need to comprise solid element when the total current sampled signal, only needs a wire that the total current sampled signal is connected to current control circuit and gets final product.When the total current sampled signal need to be converted to reference signal, reference signal produced the element that circuit need to comprise entity, and the subsequent implementation regular meeting is introduced in detail.
Need to prove, the reference signal of each parallel branch can be not identical, also can be identical, and respectively referring to Fig. 3 and Fig. 4.
Fig. 3 is the embodiment schematic diagram of the reference signal of each parallel branch provided by the invention when not identical.
Total current sample circuit 200 is used for gathering the total current that constant-current source 100 is exported, and sends to reference signal to produce circuit 300 the total current sampled signal that gathers.
Reference signal produces circuit 300, is used for being produced by the total current sampled signal reference signal V1, the V2 of each parallel branch ... Vn.That is, reference signal produces circuit 300 and produces n different reference signal, sends to respectively n the current control circuit in parallel branch.N is the number of parallel branch.
Fig. 4 is the embodiment schematic diagram of the reference signal of each parallel branch provided by the invention when identical.
Total current sample circuit 200 is used for gathering the total current that constant-current source 100 is exported, and sends to reference signal to produce circuit 300 the total current sampled signal that gathers.
Reference signal produces circuit 300, is used for being produced by the total current sampled signal reference signal V1, the V2 of each parallel branch ... Vn.Due to V1=V2=...=Vn so in this embodiment, reference signal produces circuit 300 and produces a reference signal and get final product, sends to current control circuit in each parallel branch simultaneously with this reference signal.
The below introduce when the total current sample circuit be the total current sampling resistor, and the total current sampled signal is directly as the reference signal of each parallel branch, when the reference signal of each parallel branch equates, the current control circuit of correspondence.
Referring to Fig. 5, this figure is embodiment two schematic diagrames of Multi-path electricity flow control circuit provided by the invention.
The total current sample circuit is total current sampling resistor Ris, described total current sampling resistor Ris is connected between the negative output terminal and ground of described constant-current source 100, be that between the negative terminal of the negative output terminal of constant-current source 100 and parallel branch, the positive output end of described constant-current source 100 connects the anode of each parallel branch.
The Multi-path electricity flow control circuit that the present embodiment provides, the total current sampled signal that produces when described total current sample circuit is during directly as the reference signal of each parallel branch, be voltage on Ris directly as the reference signal of each parallel branch, V1=...=Vn;
Described current control circuit 400 comprises: the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, compensating network 400a and the first amplifier U1;
The inverting input of the first amplifier U1 is by the 5th resistance R 5 of series connection and the negative output terminal of the 3rd resistance R 3 connection constant-current sources 100; The inverting input of the first amplifier U1 is by the 5th resistance R 5 of series connection and the output of the current sampling circuit Rs1 of the 4th resistance R 4 connection parallel branches;
Be connected with compensating network 400a between the output of the first amplifier U1 and inverting input;
The in-phase input end ground connection of the first amplifier U1;
The output of the first amplifier U1 connects the control end of the impedance adjustable tube S1 in parallel branch.
This current control circuit 400 compares the voltage Vs1 on V1 and Rs1, controls S1 according to comparative result.
This current control circuit 400 is being introduced as example in the first parallel branch A1, and the current control circuit of other parallel branches is identical with these current control circuit 400 topologys, and operation principle is identical, therefore, gives unnecessary details no longer one by one.
Referring to Fig. 6, this figure is embodiment three schematic diagrames of Multi-path electricity flow control circuit provided by the invention.
The present embodiment and the difference of the described embodiment of Fig. 5 are that the structure of current control circuit is different, and the current control circuit in the present embodiment comprises: the 3rd resistance R 3, the 4th resistance R 4 and the first amplifier U1;
The inverting input of the first amplifier U1 connects the negative output terminal of constant-current source 100 by the 3rd resistance R 3, the inverting input of the first amplifier U1 connects the output of the current sampling circuit Rs1 of parallel branch by the 4th resistance R 4;
The in-phase input end ground connection of the first amplifier U1;
The output of the first amplifier U1 connects the control end of the impedance adjustable tube S1 in parallel branch.
This current control circuit 400 compares the voltage Vs1 on V1 and Rs1, controls S1 according to comparative result.
This current control circuit 400 is being introduced as example in the first parallel branch A1, and the current control circuit of other parallel branches is identical with these current control circuit 400 topologys, and operation principle is identical, therefore, gives unnecessary details no longer one by one.
Current control circuit shown in Figure 6 has lacked R5 and compensating network 400a than current control circuit shown in Figure 5, faster than in Fig. 5 of the loop response that can guarantee like this current control circuit 400.
On the basis of Fig. 5 and Fig. 6 embodiment; the Multi-path electricity flow control circuit that the present embodiment provides can also comprise open loop protection circuit; the below introduces open loop protection circuit on the basis of embodiment shown in Figure 5, be understandable that this open loop protection circuit is equally applicable to embodiment shown in Figure 6.
Referring to Fig. 7, this figure is Multi-path electricity flow control circuit embodiment provided by the invention four schematic diagrames.
This open loop protection circuit comprises n-1 protection branch road that is connected in parallel on described total current sampling resistor Ris, and each protection branch road comprises a resistance and switch of series connection; As shown in Figure 7, K1 and Ro1 are composed in series a protection branch road, and K2 and Ro2 are composed in series a protection branch road, and Kn-1 and Ro (n-1) are composed in series a protection branch road.
When all parallel branches all work, all switches (K1, K2 in open loop protection circuit ... Kn-1) all conductings, at this moment, the total current sample circuit is Ris and Ro1 in parallel ... Ro (n-1), the total current sampled signal of output is the current sampling signal on these a plurality of parallel resistances;
When one tunnel parallel branch open circuit was arranged, a switch of controlling in open loop protection circuit disconnected.Sampling resistor resistance in the total current sample circuit raises, because the total current of constant-current source output is constant, therefore the voltage signal of exporting on the total current sampling resistor increases, the reference signal that is input in current control circuit also increases, effect by current control circuit, electric current on the parallel branch of not opening a way is also increased, and then make the total current of constant-current source output can continue to distribute on the parallel branch of not opening a way.
When reference signal was obtained by the conversion of total current sampled signal, reference signal produced circuit and comprises solid element, is elaborated below in conjunction with accompanying drawing.
Referring to Fig. 8, this figure is Multi-path electricity flow control circuit embodiment provided by the invention five schematic diagrames.
The reference signal that the present embodiment provides produces circuit 300 and comprises: the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the second amplifier IC1;
The in-phase input end of the second amplifier IC1 connects the negative terminal of parallel branch by the 7th resistance R 7;
The inverting input of the second amplifier IC1 connects the negative output terminal of constant-current source 100 by the 6th resistance R 6, the inverting input of the second amplifier IC1 connects the output of the second amplifier IC1 by the 8th resistance R 8 simultaneously;
The output of the second amplifier IC1 connects the input of the current control circuit 400 in each parallel branch.
Reference signal corresponding shown in Figure 8 produces circuit, and the current control circuit 400 that another embodiment of the present invention provides comprises: the first amplifier U1, compensating network 400a and the 9th resistance R 9;
The in-phase input end of the first amplifier U1 connects the output of described the second amplifier IC1 as the input of current control circuit 400;
The inverting input of the first amplifier U1 connects the output of the current sampling circuit in parallel branch by the 9th resistance R 9; That is, connect the end of sampling resistor Rs1 by R9, the other end ground connection of Rs1;
The inverting input of the first amplifier U1 connects the output of the first amplifier U1 by compensating network 400a;
The output of the first amplifier U1 connects the control end of the impedance adjustable tube S1 in parallel branch.
Referring to Fig. 9, this figure is Multi-path electricity flow control circuit embodiment provided by the invention six schematic diagrames.
Difference embodiment illustrated in fig. 9 and embodiment illustrated in fig. 8 is, the current control circuit in each parallel branch is different, and the current control circuit 400 that the present embodiment provides comprises: the first amplifier U1;
The in-phase input end of the first amplifier U1 connects the output of described the second amplifier IC1 as the input of current control circuit 400;
The inverting input of the first amplifier U1 connects the output of the current sampling circuit in parallel branch; That is, connect the end of sampling resistor Rs1 by R9, the other end ground connection of Rs1;
The output of the first amplifier U1 connects the control end of the impedance adjustable tube S1 in parallel branch.
Current control circuit shown in Figure 9 has lacked R9 and compensating network 400a than current control circuit shown in Figure 8, faster than in Fig. 8 of the loop response that can guarantee like this current control circuit 400.
Need to prove, in above all embodiment, the reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
Based on above-mentioned Multi-path electricity flow control circuit, the present invention also provides a kind of Multi-path electricity method of flow control, describes its workflow in detail below in conjunction with specific embodiment.
The Multi-path electricity method of flow control that the embodiment of the present invention provides is applicable to n road parallel branch, and each parallel branch comprises a plurality of loads of series connection, an impedance adjustable tube and a current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source;
Described current control circuit compares the current signal of this parallel branch and the reference signal of this parallel branch, control the impedance adjustable tube of this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting; Described reference signal directly obtains or changes rear acquisition by the total current sampled signal of constant-current source, and the reference signal of each parallel branch equates or be unequal;
Described impedance adjustable tube, voltage or the size of current of the control end of adjusting by control group can change the impedance magnitude at the another two ends of impedance adjustable tube.
Need to prove, described impedance adjustable tube can be metal-oxide-semiconductor, also can be triode, and when the impedance adjustable tube was metal-oxide-semiconductor, its control end was grid, and another two ends are source electrode and drain electrode; When the impedance adjustable tube was triode, its control end was base stage, and another two ends are emitter and collector.The impedance adjustable tube of using in the embodiment of the present invention works in the range of linearity, namely by regulating voltage or the electric current of control end, the impedance magnitude that can regulate another two ends.
Multi-path electricity method of flow control provided by the invention gathers the output current of constant-current source, as the total current sampled signal, with the total current sampled signal directly or indirectly as the reference signal of parallel branch; Electric current under the current control circuit of each parallel branch is set by the reference signal of controlling the impedance adjustable tube of connecting on this parallel branch and making the electric current of this parallel branch reach this parallel branch.Because the variation along with the total current sampled signal of the reference signal of each parallel branch changes, therefore, when the output current of constant-current source changes, the reference signal that the electric current that still can make parallel branch produces along with the output current of constant-current source and distributing.Parallel branch in circuit provided by the invention and method does not comprise the DC/DC constant-current circuit, and therefore, circuit structure corresponding to method provided by the invention is simple, and cost is low.
In the Multi-path electricity method of flow control that the embodiment of the present invention provides, the reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
The above is only preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (12)
1. a Multi-path electricity flow control circuit, is characterized in that, is applicable to n road parallel branch, and each parallel branch comprises a plurality of loads of series connection, an impedance adjustable tube and a current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source; N 〉=1;
The total current sample circuit for the total current of the described constant-current source of sampling, produces the total current sampled signal;
Reference signal produces circuit, is used for described total current sampled signal directly as the reference signal of each parallel branch, or is converted to the reference signal of each parallel branch; The reference signal of each parallel branch equates or is unequal;
Described current control circuit, be used for to receive the current signal of this parallel branch that the current sampling circuit of this parallel branch gathers, and receive the described reference signal of this parallel branch, current signal and the described reference signal of this parallel branch are compared, control impedance adjustable tube in this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting;
Described impedance adjustable tube, voltage or the size of current of the control end by the control group adjustable tube can change the impedance magnitude at the another two ends of impedance adjustable tube.
2. Multi-path electricity flow control circuit according to claim 1, it is characterized in that, described total current sample circuit is the total current sampling resistor, described total current sampling resistor is connected between the negative terminal of the negative output terminal of described constant-current source and parallel branch, and the positive output end of described constant-current source connects the anode of each parallel branch.
3. Multi-path electricity flow control circuit according to claim 2, it is characterized in that, the total current sampled signal that produces when described total current sample circuit is during directly as the reference signal of each parallel branch, and described current control circuit comprises: the 3rd resistance, the 4th resistance, the 5th resistance, compensating network and the first amplifier;
The inverting input of the first amplifier is by the 5th resistance of series connection and the negative output terminal of the 3rd resistance connection constant-current source; The inverting input of the first amplifier is by the 5th resistance of series connection and the output of the current sampling circuit of the 4th resistance connection parallel branch;
Be connected with compensating network between the output of the first amplifier and inverting input;
The in-phase input end ground connection of the first amplifier;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
4. Multi-path electricity flow control circuit according to claim 2, it is characterized in that, the total current sampled signal that produces when described total current sample circuit is during directly as the reference signal of each parallel branch, and described current control circuit comprises: the 3rd resistance, the 4th resistance and the first amplifier;
The inverting input of the first amplifier connects the negative output terminal of constant-current source by the 3rd resistance, the inverting input of the first amplifier connects the output of the current sampling circuit of parallel branch by the 4th resistance;
The in-phase input end ground connection of the first amplifier;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
5. according to claim 3 or 4 described Multi-path electricity flow control circuits, it is characterized in that, also comprise open loop protection circuit, this open loop protection circuit comprises n-1 protection branch road that is connected in parallel on described total current sampling resistor, and each protection branch road comprises a resistance and switch of series connection;
When all parallel branches all work, the equal conducting of all switches in open loop protection circuit; When one tunnel parallel branch open circuit was arranged, a switch of controlling in open loop protection circuit disconnected.
6. Multi-path electricity flow control circuit according to claim 2, is characterized in that, described reference signal produces circuit and comprises: the 6th resistance, the 7th resistance, the 8th resistance and the second amplifier;
The in-phase input end of the second amplifier connects the negative terminal of parallel branch by the 7th resistance;
The inverting input of the second amplifier connects the negative output terminal of constant-current source by the 6th resistance, the inverting input of the second amplifier connects the output of the second amplifier by the 8th resistance simultaneously;
The output of the second amplifier connects the input of the current control circuit in each parallel branch.
7. Multi-path electricity flow control circuit according to claim 6, is characterized in that, described current control circuit comprises: the first amplifier, compensating network and the 9th resistance;
The in-phase input end of the first amplifier connects the output of described the second amplifier as the input of current control circuit;
The inverting input of the first amplifier connects the output of the current sampling circuit in parallel branch by the 9th resistance;
The inverting input of the first amplifier connects the output of the first amplifier by compensating network;
The output of the first amplifier connects the control end of the impedance switch pipe in parallel branch.
8. Multi-path electricity flow control circuit according to claim 6, is characterized in that, described current control circuit comprises: the first amplifier;
The in-phase input end of the first amplifier connects the output of described the second amplifier as the input of current control circuit;
The inverting input of the first amplifier connects the output of the current sampling circuit in parallel branch;
The output of the first amplifier connects the control end of the impedance adjustable tube in parallel branch.
9. Multi-path electricity flow control circuit according to claim 2, is characterized in that, described current sampling circuit is sampling resistor.
10. Multi-path electricity flow control circuit according to claim 9, is characterized in that, the reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
11. a Multi-path electricity method of flow control is characterized in that, is applicable to n road parallel branch, each parallel branch comprises a plurality of loads of series connection, an impedance adjustable tube and a current sampling circuit; The corresponding current control circuit of each described parallel branch; This n road parallel branch is powered by constant-current source;
Described current control circuit compares the current signal of this parallel branch and the reference signal of this parallel branch, control the impedance adjustable tube of this parallel branch according to comparative result, so that the electric current of the reference signal that the electric current of this parallel branch is this parallel branch under setting; Described reference signal directly obtains or changes rear acquisition by the total current sampled signal of constant-current source, and the reference signal of each parallel branch equates or be unequal;
Described impedance adjustable tube, voltage or the size of current of the control end of adjusting by control group can change the impedance magnitude at the another two ends of impedance adjustable tube.
12. Multi-path electricity method of flow control according to claim 11 is characterized in that,
Reference signal in described total current sampled signal and each parallel branch is proportional, and proportionality coefficient is K, and reference signal equals the 1/K of total current sampled signal;
The proportionality coefficient corresponding when each parallel branch all equates and K=1, and the resistance of the sampling resistor of each parallel branch equates and the resistance of total current sampling resistor when being the 1/n of sampling resistor resistance of each parallel branch, n is the number of parallel branch, the electric current of each parallel branch is equal, and with the total current mean allocation;
Or,
When proportionality coefficient corresponding to each parallel branch all equates and K=n, n is the number of parallel branch, and described total current sampling resistor is when equating with the resistance of the sampling resistor of each parallel branch, and each parallel branch electric current is equal, and with the total current mean allocation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349028.2A CN103096567B (en) | 2011-11-07 | 2011-11-07 | Multi-channel current control circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349028.2A CN103096567B (en) | 2011-11-07 | 2011-11-07 | Multi-channel current control circuit and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103096567A true CN103096567A (en) | 2013-05-08 |
| CN103096567B CN103096567B (en) | 2015-02-18 |
Family
ID=48208524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110349028.2A Active CN103096567B (en) | 2011-11-07 | 2011-11-07 | Multi-channel current control circuit and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103096567B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281848A (en) * | 2013-06-20 | 2013-09-04 | 广州从兴电子开发有限公司 | Control method and control device of LED street lamp |
| CN104168688A (en) * | 2013-05-15 | 2014-11-26 | 安恩国际公司 | Light-emitting diode lighting device having multiple driving stages |
| CN104777345A (en) * | 2015-04-22 | 2015-07-15 | 四川英杰电气股份有限公司 | Current detecting circuit and feedback control circuit applied to laminated control power supply and power supply |
| CN109638767A (en) * | 2019-01-03 | 2019-04-16 | 深圳贝仕达克技术股份有限公司 | A kind of circuit and method reducing current sample error |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674693A (en) * | 2009-10-01 | 2010-03-17 | 英飞特电子（杭州）有限公司 | Multichannel constant-current control circuit applicable to LED driver |
| CN101702849A (en) * | 2009-11-12 | 2010-05-05 | 英飞特电子（杭州）有限公司 | Multi-path PWM chopped wave current sharing circuit for LED driver |
| CN101754541A (en) * | 2010-01-27 | 2010-06-23 | 英飞特电子（杭州）有限公司 | DC bus voltage following control circuit suitable for multi-path parallel LEDs |
| CN201550320U (en) * | 2009-10-01 | 2010-08-11 | 英飞特电子（杭州）有限公司 | Multipath constant current control circuit suitable for LED drivers |
| CN201708995U (en) * | 2010-05-31 | 2011-01-12 | 艾迪光电（杭州）有限公司 | LED constant current drive circuit and output voltage adjustable circuit |
| CN201967183U (en) * | 2010-10-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | LED multi-way output current-sharing circuit |
-
2011
- 2011-11-07 CN CN201110349028.2A patent/CN103096567B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674693A (en) * | 2009-10-01 | 2010-03-17 | 英飞特电子（杭州）有限公司 | Multichannel constant-current control circuit applicable to LED driver |
| CN201550320U (en) * | 2009-10-01 | 2010-08-11 | 英飞特电子（杭州）有限公司 | Multipath constant current control circuit suitable for LED drivers |
| CN101702849A (en) * | 2009-11-12 | 2010-05-05 | 英飞特电子（杭州）有限公司 | Multi-path PWM chopped wave current sharing circuit for LED driver |
| CN101754541A (en) * | 2010-01-27 | 2010-06-23 | 英飞特电子（杭州）有限公司 | DC bus voltage following control circuit suitable for multi-path parallel LEDs |
| CN201708995U (en) * | 2010-05-31 | 2011-01-12 | 艾迪光电（杭州）有限公司 | LED constant current drive circuit and output voltage adjustable circuit |
| CN201967183U (en) * | 2010-10-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | LED multi-way output current-sharing circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168688A (en) * | 2013-05-15 | 2014-11-26 | 安恩国际公司 | Light-emitting diode lighting device having multiple driving stages |
| CN104168688B (en) * | 2013-05-15 | 2016-06-01 | 安恩国际公司 | Possesses the light emitting diode illuminating apparatus in multiple drive power stage |
| CN103281848A (en) * | 2013-06-20 | 2013-09-04 | 广州从兴电子开发有限公司 | Control method and control device of LED street lamp |
| CN103281848B (en) * | 2013-06-20 | 2016-06-08 | 南方电网综合能源有限公司 | A kind of control method of LED street lamp and device |
| CN104777345A (en) * | 2015-04-22 | 2015-07-15 | 四川英杰电气股份有限公司 | Current detecting circuit and feedback control circuit applied to laminated control power supply and power supply |
| CN104777345B (en) * | 2015-04-22 | 2017-06-13 | 四川英杰电气股份有限公司 | Current detection circuit, feedback control circuit and power supply for lamination control power supply |
| CN109638767A (en) * | 2019-01-03 | 2019-04-16 | 深圳贝仕达克技术股份有限公司 | A kind of circuit and method reducing current sample error |
| CN109638767B (en) * | 2019-01-03 | 2020-04-28 | 深圳贝仕达克技术股份有限公司 | Circuit and method for reducing current sampling error |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103096567B (en) | 2015-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101674693B (en) | Multichannel constant-current control circuit applicable to LED driver | |
| CN101702849B (en) | Multi-path PWM chopped wave current sharing circuit for LED driver | |
| CN202103913U (en) | Led adjusting system | |
| CN103606354A (en) | LED backlight driving circuit and liquid crystal display | |
| CN102752899A (en) | Circuit for regulating LED current | |
| CN201690362U (en) | Flow equalizing circuit for parallel connection of power supplies | |
| CN201813159U (en) | Power parallel machine flow equalization circuit with bidirectional adjustable output voltage | |
| CN103096567B (en) | Multi-channel current control circuit and control method | |
| CN201550320U (en) | Multipath constant current control circuit suitable for LED drivers | |
| CN103944375A (en) | PFC control circuit and PFC circuit with same used | |
| CN207731625U (en) | Multichannel backlight control apparatus based on SPI communication | |
| CN104143949A (en) | Photovoltaic power generation method and system | |
| CN204883580U (en) | Use power frame of three -phase electricity input | |
| CN202008814U (en) | Driving circuit and liquid crystal television | |
| CN103840765A (en) | Photovoltaic collector-shoe gear | |
| CN207369057U (en) | Many intelligence network exact demands and precisely supply intelligent management system | |
| CN102736799A (en) | Infrared touch screen driven by constant current source and constant current source driving circuit | |
| CN108566090A (en) | A kind of two-way bipolarity dcdc converter of low-voltage direct | |
| CN205123691U (en) | High pressure cascade amplification ware device based on buffer | |
| CN206248744U (en) | It is a kind of to support multiple products aging equipment connected in parallel | |
| CN208079468U (en) | The controlled constant-current source circuit of Linear Control | |
| CN201976115U (en) | Communication circuit | |
| CN202455604U (en) | Phase angle detection circuit, load driver and light source adjuster | |
| CN205213103U (en) | Drive power supply and display device based on LLC topology | |
| CN102622029A (en) | Single-power-supply non-isolated adjustable constant-current source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161011 Address after: 311500, No. 88 South Road, Tonglu Economic Development Zone, Tonglu County, Hangzhou, Zhejiang Patentee after: ZHEJIANG YINGFEITE OPTOELECTRONICS CO., LTD. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: LED One (Hangzhou) Co.,Ltd. |