CN101902860B - Multipath constant-current driving circuit - Google Patents
Multipath constant-current driving circuit Download PDFInfo
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- CN101902860B CN101902860B CN2010102464943A CN201010246494A CN101902860B CN 101902860 B CN101902860 B CN 101902860B CN 2010102464943 A CN2010102464943 A CN 2010102464943A CN 201010246494 A CN201010246494 A CN 201010246494A CN 101902860 B CN101902860 B CN 101902860B
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Abstract
The invention discloses a multipath constant-current driving circuit comprising a DC/AC converter, a main transformer and at least two rectifying and filtering units, wherein the main transformer comprises at least one auxiliary side winding with a tap; at least two rectifying and filtering units form a power supply loop respectively with the auxiliary side winding of the main transformer; each power supply loop comprises a first rectifying loop and a second rectifying loop which are respectively used for rectifying positive and negative semi-cycle alternating-current voltage; a current-sharing transformer is arranged between neighboring first power supply loop and second power supply loop, and windings of the current-sharing transformer are respectively positioned in the rectifying loops contained in the first power supply loop and the second power supply loop and are used for current sharing among the different rectifying loops in which the neighboring rectifying and filtering units are positioned. The multipath constant-current driving circuit has good current-sharing level, and can reduce the size of the current-sharing transformer and lower the cost.
Description
Technical field
The present invention relates to the constant-current drive technology field, relate in particular to multi-path constant-current drive circuit.
Background technology
At present, for the LED constant current control that LED multi-path drives, the most frequently used scheme is constant voltage module+multichannel non-isolation DC/DC constant flow module.
Be illustrated in figure 1 as the LED constant-current control circuit that LED multi-path drives in the prior art.In this circuit, as the input of multichannel non-isolation DC/DC constant flow module, every road non-isolation DC/DC constant flow module is done separately constant current control after the input voltage Vac process constant voltage module.But because the voltage of constant voltage module and the voltage of LED generally have larger pressure reduction, so the efficient of rear class multichannel non-isolation DC/DC constant flow module can be too not high, and multichannel non-isolation DC/DC constant flow module complex structure, and cost is higher.
Application number is in 200810085227.5 the Chinese patent, a kind of multi-group light-emitting diode current-balancing supply circuit is provided, as shown in Figure 2, the first inductance L ca1 of coupling inductance Lca is connected in the DC loop after diode D1 and the D2 rectification, the second inductance L ca2 of coupling inductance Lca is connected in the DC loop after diode D3 and the D4 rectification, thereby plays the effect of balanced two paths of LED load by coupling inductance Lca.But, for circuit shown in Figure 2, because two coils of coupling inductance Lca are connected in the DC loop, DC component is arranged, and exciting curent is unidirectional in the coupling inductance, therefore, when the Voltage unbalance of two-way load branch, the current error of two-way load branch is larger, all mobility contrast; And, when there is DC component in coupling inductance, can cause magnetic core saturated, need to open air gap, so inductance value is when large, the coupling inductance volume is large and cost is high.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is, a kind of multi-path constant-current drive circuit is provided, and all mobility is good; And, can reduce the volume of current-sharing transformer, reduce cost.
For this reason, the embodiment of the invention adopts following technical scheme:
The invention provides a kind of multi-path constant-current drive circuit, comprising: DC/AC converter, main transformer and at least two rectification filtering units;
The DC/AC converter provides alternating voltage for main transformer; Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding;
Described at least two rectification filtering units form current supply circuit with the secondary winding of main transformer respectively; Each current supply circuit comprises: the first commutating circuit and the second commutating circuit, and described the first commutating circuit and the second commutating circuit are respectively applied to carry out the rectification of positive-negative half-cycle alternating voltage; Described the first winding and the second winding lay respectively at described the first commutating circuit and the second commutating circuit;
A current-sharing transformer is set between first current supply circuit at adjacent rectification filtering unit place and the second current supply circuit, described current-sharing transformer comprises four windings, lay respectively in the commutating circuit that the first current supply circuit and the second current supply circuit comprise, be used for realizing the current-sharing between the different commutating circuits at adjacent rectification filtering unit place.
In four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, and the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
Described rectification filtering unit comprises the first diode, the second diode and the first electric capacity; Then,
Described current supply circuit comprises: the Same Name of Ends of the first winding of secondary winding is by successively the first diode and the first electric capacity different name end of connecting the first winding of serial connection, the Same Name of Ends of the first winding of the anodic bonding secondary winding of the first diode; First electric capacity of the Same Name of Ends of the second winding of secondary winding by serial connection successively be connected diode and connect the different name end of the second winding, the different name end of the second winding of the anodic bonding secondary winding of described the second diode.
It is characterized in that: in the current supply circuit at the first rectification filtering unit place, the first winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first electric capacity of the first winding of secondary winding; The second winding of described current-sharing transformer is serially connected with between the different name end and the first electric capacity of the second winding of secondary winding;
In the current supply circuit at the second rectification filtering unit place, the tertiary winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first electric capacity of the first winding of secondary winding; The 4th winding of described current-sharing transformer is serially connected with between the different name end and the first electric capacity of the second winding of secondary winding.
Described current rectifying and wave filtering circuit comprises: the 3rd diode, the 4th diode, the first inductance and the second electric capacity; Then,
Described current supply circuit comprises: the Same Name of Ends of the first winding of secondary winding connects the different name end of the first winding, the Same Name of Ends of the first winding of the anodic bonding secondary winding of the 3rd diode by the 3rd diode, the first inductance and the second electric capacity that is connected in series successively; The Same Name of Ends of the second winding of secondary winding connects the different name end of the second winding, the different name end of the second winding of the anodic bonding secondary winding of described the 4th diode by the second electric capacity, the first inductance and the 4th diode that is connected in series successively.
It is characterized in that, in the current supply circuit at the first rectification filtering unit place, the first winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first inductance of the first winding of secondary winding; The second winding of described current-sharing transformer is serially connected with between the different name end and the first inductance of the second winding of secondary winding;
In the current supply circuit at the second rectification filtering unit place, the tertiary winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first inductance of the first winding of secondary winding; The 4th winding of described current-sharing transformer is serially connected with between the different name end and the first inductance of the second winding of secondary winding.
Described main transformer comprises a former limit winding and the secondary winding with tap; Then,
This secondary winding with tap forms current supply circuit with each described rectification filtering unit respectively.
Described main transformer comprises a former limit winding and at least two secondary windings with tap, the corresponding rectification filtering unit of each secondary winding; Then,
The rectification filtering unit that each secondary winding is corresponding with this secondary winding forms current supply circuit.
Described main transformer comprises at least two former limit windings and at least two secondary windings with tap, and former limit winding, secondary winding and rectification filtering unit are corresponding one by one; Then,
The rectification filtering unit that each secondary winding is corresponding with this secondary winding forms current supply circuit.
Described DC/AC converter is bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.
A kind of multi-path constant-current drive circuit also is provided, comprises: DC/AC converter, main transformer;
The DC/AC converter provides alternating voltage for main transformer;
Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding; Have at least one secondary winding in the secondary winding of described main transformer, each the secondary winding correspondence in described at least one secondary winding is the two-stage current supply circuit at least;
Every one-level current supply circuit of described secondary winding comprises: the first commutating circuit and the second commutating circuit; The first commutating circuit comprises: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding by the first winding of the common corresponding current-sharing transformer of the tertiary winding of rectification filtering unit, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit; The second commutating circuit comprises: the first end of the second winding of this secondary winding is by the 4th winding of the second winding of the common corresponding current-sharing transformer of current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end of the first winding that rectification filtering unit connects described secondary winding;
Described current-sharing transformer comprises four windings, for the current-sharing between the different commutating circuits of realizing adjacent rectification filtering unit place.
In four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, and the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
Described rectification filtering unit comprises the first diode, the second diode and the first electric capacity.
The first commutating circuit comprises: the first winding of the first end of the first winding of this secondary winding current-sharing transformer that the tertiary winding by all current-sharing transformers of arranging in the current supply circuits at different levels before, the first diode, current supply circuit at the corresponding levels and next stage current supply circuit are common corresponding successively and the second end of the first winding that the first electric capacity connects described secondary winding;
The second commutating circuit comprises: the first end of the second winding of this secondary winding successively the 4th winding of the second winding by the common corresponding current-sharing transformer of the first electric capacity, current supply circuit at the corresponding levels and next stage current supply circuit, the second diode and all current-sharing transformers of arranging in the current supply circuits at different levels before connects the second end of the first winding of described secondary winding.
The first commutating circuit comprises: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the first winding, the first diode and first electric capacity of the common corresponding current-sharing transformer of the tertiary winding of all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit;
The second commutating circuit comprises: the first end of the second winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the 4th winding of the second winding of the common corresponding current-sharing transformer of the first electric capacity, the second diode, current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before.
Described main transformer is:
The transformer that comprises a former limit winding and a secondary winding; Perhaps,
The transformer that comprises a former limit winding and at least two secondary windings; Perhaps,
Comprise at least two former limit windings and at least two secondary windings, and former limit winding and secondary winding be transformer one to one.
Described DC/AC converter is bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.
A kind of multi-path constant-current drive circuit also is provided, comprises: DC/AC converter, main transformer;
The DC/AC converter provides alternating voltage for main transformer;
Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding; Shown in the secondary winding of main transformer be connected with at least two power supply branch road groups, consist of respectively main supply electricity loop;
Between two adjacent main supply electricity loops a current-sharing transformer is set; The first winding of current-sharing transformer and the second winding are arranged in the main supply electricity loop in described two main supply electricity loop, and the tertiary winding and the 4th winding are arranged in another main supply electricity loop in described two main supply electricity loop, are used for carrying out two current-sharings between the main supply electricity loop.
At least one main supply electricity loop in described two main supply electricity loop comprises: two-stage current supply circuit at least, and every one-level current supply circuit comprises: the first commutating circuit and the second commutating circuit; The first commutating circuit comprises: the first end of the first winding of corresponding secondary winding connects the second end of the first winding of described secondary winding by the first winding of the common corresponding current-sharing transformer of the tertiary winding of rectification filtering unit, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit; The second commutating circuit comprises: the first end of the second winding of this secondary winding is by the 4th winding of the second winding of the common corresponding current-sharing transformer of current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end of the first winding that rectification filtering unit connects described secondary winding; Described current-sharing transformer comprises four windings, for the current-sharing between the different commutating circuits of realizing adjacent rectification filtering unit place.
At least one main supply electricity loop in described two main supply electricity loop comprises: at least two current supply circuits, each current supply circuit is made of with the corresponding secondary winding of main transformer a rectification filtering unit, comprise the first commutating circuit and the second commutating circuit, the first winding and second winding of corresponding secondary winding lay respectively in described the first commutating circuit and the second commutating circuit, and described the first commutating circuit and the second commutating circuit are respectively applied to carry out the rectification of positive-negative half-cycle alternating voltage; A current-sharing transformer is set between first current supply circuit at adjacent rectification filtering unit place and the second current supply circuit, described current-sharing transformer comprises four windings, lay respectively in the commutating circuit that the first current supply circuit and the second current supply circuit comprise, be used for realizing the current-sharing between the different commutating circuits at adjacent rectification filtering unit place.
Technique effect for technique scheme is analyzed as follows:
Flow through respectively two different commutating circuits of the positive-negative half-cycle of AC power owing to current-sharing transformer the first winding and the second winding (the perhaps tertiary winding and the 4th winding), and Same Name of Ends is opposite, the winding that is equivalent to current-sharing transformer flows through two-way alternating current, therefore there is not DC component in the current-sharing transformer, therefore current-sharing transformer does not need out air gap, be easy to obtain larger inductance value under less volume, all mobility is high, and cost is low.
Description of drawings
Fig. 1 is prior art LED constant-current control circuit structural representation;
Fig. 2 is a kind of multi-group light-emitting diode current-balancing supply circuit of prior art;
Fig. 3～Fig. 3 b is a kind of two-way constant-current drive circuit of the present invention structural representation;
Fig. 4～Fig. 4 b is the another kind of two-way constant-current drive circuit of the present invention structural representation;
Fig. 5～Fig. 5 b is the third two-way constant-current drive circuit structural representation of the present invention;
Fig. 6 a～Fig. 6 e is the two-way constant-current drive circuit structural representation under the different DC/AC converters of the present invention;
Fig. 7 a～Fig. 7 c is multi-path constant-current drive circuit structural representation of the present invention;
Fig. 8 a is the 4th kind of multi-path constant-current drive circuit structural representation of the present invention;
Fig. 9 a～Fig. 9 e is the 5th kind of multi-path constant-current drive circuit structural representation of the present invention.
Embodiment
In a kind of multi-path constant-current drive circuit that the embodiment of the invention provides, comprising: DC/AC converter, main transformer and at least two rectification filtering units;
The DC/AC converter provides alternating voltage for main transformer; Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding;
Described at least two rectification filtering units form current supply circuit with the secondary winding of main transformer respectively; Each current supply circuit comprises: the first commutating circuit and the second commutating circuit, and described the first commutating circuit and the second commutating circuit are respectively applied to carry out the rectification of positive-negative half-cycle alternating voltage; Described the first winding and the second winding lay respectively at described the first commutating circuit and the second commutating circuit;
A current-sharing transformer is set between first current supply circuit at adjacent rectification filtering unit place and the second current supply circuit, described current-sharing transformer comprises four windings, lay respectively in the commutating circuit that the first current supply circuit and the second current supply circuit comprise, be used for realizing the current-sharing between the different commutating circuits at adjacent rectification filtering unit place.
Wherein, in four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, and the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
The realization of main transformer can for: comprise a former limit winding and a secondary winding; Perhaps, comprise a former limit winding and at least two secondary windings; Perhaps, comprise at least two former limit windings and at least two secondary windings etc.
The realization of described DC/AC converter can be bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.
Below, be described with reference to the accompanying drawings the realization of embodiment of the invention multi-path constant-current drive circuit.
Fig. 3 is a kind of multi-path constant-current drive circuit structural representation of the embodiment of the invention, as shown in Figure 3, this multi-path constant-current drive circuit comprises: DC/AC converter, main transformer Ta3, the first rectification filtering unit Z31 and the second rectification filtering unit Z32, and the electric energy of described the first rectification filtering unit Z31 and the second rectification filtering unit Z32 output is used to the power supply of LED load even load;
Wherein, main transformer Ta3 comprises a former limit winding and the secondary winding with tap; Described tap is divided into the first winding Wa31 and the second winding Wa32 with described secondary winding, and the different name end of the first winding Wa31 is connected with the Same Name of Ends of the second winding Wa32;
Described secondary winding forms current supply circuit with the first rectification filtering unit Z31 and the second rectification filtering unit Z32 respectively, concrete, the Same Name of Ends of the first winding Wa31 of secondary winding connects the first input end t1 of the first rectification filtering unit Z31, the different name end connects the second input t2 of the first rectification filtering unit Z31, and the different name end of the second winding Wa32 of secondary winding connects the 3rd input of the first rectification filtering unit Z31.The second rectification filtering unit Z32 is similar to the first rectification filtering unit Z31 to the annexation of this secondary winding, does not give unnecessary details here.
Current-sharing transformer T31 comprises four windings, is respectively the first winding W311, the second winding W312, tertiary winding W313, the 4th winding W314; The Same Name of Ends of the first winding W311 flows through opposite electric current with the Same Name of Ends of the second winding W312, the Same Name of Ends of tertiary winding W313, the 4th winding W314 flows through opposite electric current, and the Same Name of Ends of the first winding W311 flows through opposite electric current with the Same Name of Ends of tertiary winding W313; Wherein,
The first winding W311 and the second winding W312 are arranged in the current supply circuit at the first rectification filtering unit Z31 place, and tertiary winding W313, the 4th winding W314 are arranged in the current supply circuit at the second rectification filtering unit Z32 place.Concrete, the first winding W311 is serially connected with between the first input end t1 of the Same Name of Ends of the first winding Wa31 of secondary winding of main transformer Ta3 and the first rectification filtering unit Z31, and the second winding W312 is serially connected with between the 3rd input t3 of the different name end of the second winding Wa32 of secondary winding of main transformer Ta3 and the first rectification filtering unit Z31; Tertiary winding W313 is serially connected with between the first input end t1 of the Same Name of Ends of the first winding Wa31 of secondary winding of main transformer Ta3 and the second rectification filtering unit Z32, and the 4th winding W314 is serially connected with between the 3rd input t3 of the different name end of the second winding Wa32 of secondary winding of main transformer Ta3 and the second rectification filtering unit Z32.
Wherein, in the current supply circuit that each rectification filtering unit and secondary winding form, need to comprise two commutating circuits, carry out respectively the rectification of positive-negative half-cycle alternating voltage, for example,
Shown in Fig. 3 a, the structure of described rectification filtering unit can comprise: the first diode D1, the second diode D2 and the first capacitor C 1; Wherein,
Each current supply circuit comprises: the Same Name of Ends of the first winding Wa31 of secondary winding is by successively the first diode D1 of serial connection and the different name end that the first capacitor C 1 connects the first winding Wa31, the Same Name of Ends of the first winding Wa31 of the anodic bonding secondary winding of the first diode D1; First capacitor C 1 of the Same Name of Ends of the second winding Wa32 of secondary winding by serial connection successively be connected diode D2 and connect the different name end of the second winding Wa32, the different name end of the second winding Wa32 of the anodic bonding secondary winding of described the second diode D2.
Wherein, formed the first commutating circuit between the first winding of secondary winding and the first diode D1, the first capacitor C 1; And formed the second commutating circuit between the second winding of secondary winding and the second diode, the first capacitor C 1.Flow through respectively the AC power of positive-negative half-cycle in two commutating circuits.
And then, the first winding W311 of current-sharing transformer T31 is arranged in the first commutating circuit corresponding to the first rectification filtering unit Z31, the second winding W312 is arranged in the second commutating circuit corresponding to the first rectification filtering unit Z31, tertiary winding W313 is arranged in the first commutating circuit corresponding to the second rectification filtering unit Z32, and the 4th winding W314 is arranged in the second commutating circuit corresponding to the second rectification filtering unit Z32.
Perhaps, shown in Fig. 3 b, the structure of described rectification filtering unit can comprise: the 3rd diode D3, the 4th diode D4, the first inductance L 1 and the second capacitor C 2; Wherein,
Each current supply circuit comprises: the Same Name of Ends of the first winding W311 of secondary winding connects the different name end of the first winding W311, the Same Name of Ends of the first winding W311 of the anodic bonding secondary winding of the 3rd diode D3 by the 3rd diode D3, the first inductance L 1 and the second capacitor C 2 that is connected in series successively; The Same Name of Ends of the second winding W312 of secondary winding connects the different name end of the second winding W312, the different name end of the second winding W312 of the anodic bonding secondary winding of described the 4th diode D4 by the second capacitor C 2, the first inductance L 1 and the 4th diode D4 that is connected in series successively.
At this moment, formed the first commutating circuit between the first winding of secondary winding and the 3rd diode D3, the first inductance L 1, the second capacitor C 2; And formed the second commutating circuit between the second winding of secondary winding and the 4th diode D4, the first inductance L 1 and the second capacitor C 2.Flow through respectively the AC power of positive-negative half-cycle in two commutating circuits.
And then, the first winding W311 of current-sharing transformer T31 is arranged in the first commutating circuit corresponding to the first rectification filtering unit Z31, the second winding W312 is arranged in the second commutating circuit corresponding to the first rectification filtering unit Z31, tertiary winding W313 is arranged in the first commutating circuit corresponding to the second rectification filtering unit Z32, and the 4th winding W314 is arranged in the second commutating circuit corresponding to the second rectification filtering unit Z32.
Concrete, the operation principle of described current-sharing transformer T31 is: the output current iw311 of transformer, iw312 flow through two winding W311 of current-sharing transformer and Same Name of Ends and the different name end of W312, W311=W312 in the positive-negative half-cycle of alternating voltage respectively; Output current iw313, iw314 flow through two winding W313 of current-sharing transformer and different name end and the Same Name of Ends of W314, W313=W314 in the positive-negative half-cycle of alternating voltage respectively;
The current-sharing transformer turn ratio is W311: W313=1: 1 o'clock, if because the Voltage unbalance at two paths of LED load A1 and A2 two ends, cause load current I1 and I2 uneven, the electric current that flows through current-sharing transformer T31 Same Name of Ends and different name end is unequal, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the winding two ends of current-sharing transformer is with the pressure reduction of autobalance two paths of LED load, make the current i w311 in the current-sharing transformer, iw12 and iw313, iw314 balance, thereby the equilibrium of realization load current (I1 and I2).
Turn ratio W311 when current-sharing transformer: W313=n: during m, if because the Voltage unbalance at two paths of LED load A1 and A2 two ends, the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of each road load of autobalance, making the ratio of current-sharing transformer two-way current i w311 (iw312) and iw313 (iw314) is m: n, thereby realizes the control to the multichannel loading electric current.
Current-sharing transformer in fact only divides the alternating current of load current and measures proportionality action, and is inoperative to DC component.The inductance value of current-sharing transformer is larger, and the equal mobility between the two-way load is better.
Based on above analysis as can be known, in the multi-path constant-current drive circuit shown in Fig. 3～Fig. 3 b, flow through respectively two different commutating circuits of the positive-negative half-cycle of AC power owing to current-sharing transformer the first winding and the second winding (the perhaps tertiary winding and the 4th winding), and Same Name of Ends is opposite, the winding that is equivalent to current-sharing transformer flows through two-way alternating current, therefore there is not DC component in the current-sharing transformer, therefore current-sharing transformer does not need out air gap, under less volume, be easy to obtain larger inductance value, all mobility is very high, and cost is low; And this circuit is used for the ac square wave duty ratio near 50% occasion, almost inefficent loss; When multichannel outlet chamber pressure reduction very large (even short circuit), do not increase extra stress and the spike of rectifying tube yet, can improve device reliability and reduce device cost, be conducive to EMI.
In the multi-path constant-current drive circuit shown in Fig. 3～Fig. 3 b, the structure of main transformer is: comprise a former limit winding and a secondary winding, consist of current supply circuit by this secondary winding and each rectification filtering unit; In actual applications, the structure of main transformer can also for: comprise a former limit winding and at least two secondary windings, at this moment, the corresponding rectification filtering unit of each secondary winding, thereby form respectively current supply circuit, at this moment, the circuit structure of Fig. 3 is transformed to circuit structure shown in Figure 4, Fig. 4 only is that from the difference of Fig. 3 the structure of main transformer is different, and then causes the current supply circuit that forms slightly different.Same, Fig. 4 a and Fig. 4 b have provided the implementation structure of multi-path constant-current drive circuit of the present invention under the different rectification filtering units, and Fig. 4 a and Fig. 4 b be corresponding diagram 3a and Fig. 3 b respectively, and difference only is the difference of main transformer structure, repeats no more here.
Perhaps, in the multi-path constant-current drive circuit shown in Fig. 3～Fig. 3 b, the structure of main transformer can also for: comprise at least two former limit windings and at least two secondary windings, corresponding one by one between former limit winding, secondary winding and the rectification filtering unit.At this moment, the corresponding rectification filtering unit of each secondary winding, thus form respectively current supply circuit, at this moment, the circuit construction variations of Fig. 3 is circuit structure shown in Figure 5, and Fig. 5 only is that from the difference of Fig. 3 the structure of main transformer is different, and then causes the current supply circuit that forms slightly different.Same, Fig. 5 a and Fig. 5 b have provided the implementation structure of multi-path constant-current drive circuit of the present invention under the different rectification filtering units, and Fig. 5 a and Fig. 5 b be corresponding diagram 3a and Fig. 3 b respectively, and difference only is the difference of main transformer structure, repeats no more here.
And then, do not limit among realization the present invention of DC/AC converter, can be bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.For example, in the multi-path constant-current drive circuit implementation structure of the present invention shown in Fig. 6 a～Fig. 6 e, the realization of DC/AC converter is respectively LLC resonant circuit, symmetrical half bridge circuit, asymmetry half-bridge circuit, full-bridge circuit and push-pull circuit.
Multi-path constant-current drive circuit shown in above is 2 the tunnel, in actual applications, can also expand to the situation more than 2 tunnel, at this moment, shown in Fig. 7 a～7c, difference corresponding diagram 3a, Fig. 4 a and Fig. 5 a.
Shown in Fig. 8 a, the present invention also provides another kind of multi-path constant-current drive circuit, comprises in this circuit: DC/AC converter, main transformer;
The DC/AC converter provides alternating voltage for main transformer;
Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding; Have at least one secondary winding in the secondary winding of described main transformer, each the secondary winding correspondence in described at least one secondary winding is the two-stage current supply circuit at least;
Every one-level current supply circuit of each secondary winding comprises: the first commutating circuit and the second commutating circuit; The first commutating circuit comprises: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding by the first winding of the common corresponding current-sharing transformer of the tertiary winding of rectification filtering unit, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit; The second commutating circuit comprises: the first end of the second winding of this secondary winding is by the 4th winding of the second winding of the common corresponding current-sharing transformer of current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end of the first winding that rectification filtering unit connects described secondary winding;
Described current-sharing transformer comprises four windings, for the current-sharing between the different commutating circuits of realizing adjacent rectification filtering unit place.
Wherein, in four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, and the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
Shown in Fig. 8 a, described rectification filtering unit can comprise the first diode D1, the second diode D2 and the first capacitor C 1.
Concrete, shown in Fig. 8 a, secondary winding correspondence wherein multistage current supply circuit, and every one-level current supply circuit all comprises the first commutating circuit and the second commutating circuit, and wherein,
In Fig. 8 a, the first commutating circuit comprises: the first end of the first winding of this secondary winding is the second end of the first winding of the first winding by the common corresponding current-sharing transformer of the tertiary winding of the first diode D1, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit and the described secondary winding of the first capacitor C 1 connection successively;
The second commutating circuit comprises: the first end of the second winding of this secondary winding is successively by the 4th winding of the second winding of the common corresponding current-sharing transformer of the first capacitor C 1, current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end that the second diode D2 connects the first winding of described secondary winding.
Perhaps, in described each current supply circuit, the first commutating circuit can comprise: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the first winding, the first diode and first electric capacity of the common corresponding current-sharing transformer of the tertiary winding of all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit;
The second commutating circuit can comprise: the first end of the second winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the 4th winding of the second winding of the common corresponding current-sharing transformer of the first electric capacity, the second diode, current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before.
Thereby N-1 current-sharing transformer realized the current-sharing of front N-2 road load total current and last road load current, thereby realizes the current-sharing between the load current of N road.
For example, in Fig. 8 a, for N-1 level current supply circuit, its first commutating circuit comprises: the first end of the first winding of this secondary winding is successively by the tertiary winding of the first diode D1, current-sharing transformer T81～current-sharing transformer T8 (N-2), the first winding of current-sharing transformer T8 (N-1) and the second end that the first capacitor C 1 connects the first winding of described secondary winding;
The second commutating circuit comprises: the first end of the second winding of this secondary winding is successively by the second winding of the first capacitor C 1, current-sharing transformer T8 (N-1), the 4th winding of current-sharing transformer T8 (N-2)～current-sharing transformer T81 and the second end that the second diode D2 connects the first winding of described secondary winding.
For N level current supply circuit, its first commutating circuit comprises: the first end of the first winding of this secondary winding passes through the tertiary winding of the first diode D1, current-sharing transformer T81～current-sharing transformer T8 (N-1) and the second end that the first capacitor C 1 connects the first winding of described secondary winding successively
The second commutating circuit comprises: the first end of the second winding of this secondary winding is the second end that connects the first winding of described secondary winding of the 4th winding and the second diode D2 by the first capacitor C 1, current-sharing transformer T8 (N-1)～current-sharing transformer T81 successively.
Here, because there is not rear one-level current supply circuit in N level current supply circuit, therefore, do not comprise the first winding and second winding of current-sharing transformer in the N level current supply circuit.
In addition, among Fig. 8 a, described main transformer is the transformer that comprises a former limit winding and a secondary winding; In actual applications, described main transformer can also be the transformer that comprises a former limit winding and at least two secondary windings; Perhaps, comprise at least two former limit windings and at least two secondary windings, and former limit winding and secondary winding be transformer one to one.At this moment, each secondary winding of main transformer can be corresponding be similar to the multistage current supply circuit shown in Fig. 8 a.
For above technical scheme, in the included secondary winding of main transformer, whole corresponding described at least two-stage current supply circuits respectively of each the secondary winding in the secondary winding; Perhaps, for each secondary winding, can also be corresponding a plurality of described at least two-stage current supply circuits, can realize multi-path constant-current drive circuit of the present invention equally.
Perhaps, it also can be each secondary winding corresponding at least two-stage current supply circuit respectively in a part (at least one) the secondary winding in whole secondary windings, the secondary winding of other parts then can use circuit structure formation current supply circuit of the prior art to be load supplying, carry out the current-sharing of electric current, perhaps also can use the various current supply circuits among Fig. 3～the present invention such as Fig. 7 c to be load supplying, carry out the current-sharing of electric current, do not limit here.
For example, the circuit structure shown in Fig. 8 a and Fig. 7 a namely is combined in the same multi-path constant-current drive circuit, at this moment,
For the drive circuit shown in Fig. 7 a, all roads (being made as M (M＞=2)) power supply branch road of formation constant-current drive circuit that be connected with the secondary winding, parallel with one another can be called the first power supply branch road group; And for the drive circuit shown in Fig. 8 a, all road power supply branch roads that be connected with the secondary winding, that consist of multistage constant-current drive circuit can be called the second power supply branch road group;
Then, shown in Fig. 9 a, main transformer comprises a former limit winding and a secondary winding, then, the first power supply branch road group be connected the input of power supply branch road group and be connected with the two ends of the secondary winding of main transformer respectively, also namely the first power supply branch road group and the second power supply branch road group are parallel on the same secondary winding, here the current supply circuit that the first power supply branch road group and secondary winding is connected and composed is called the first main supply electricity loop, and the current supply circuit that the second power supply branch road group and secondary winding are connected and composed is called the electric loop of the second main supply; At this moment, in order to realize the current-sharing between the total current In in the first main supply electricity loop total current Im and the second main supply electricity loop, then can between two main supply electricity loops, a current-sharing transformer T90 be set again, wherein, the first winding and the second winding are arranged at respectively secondary winding and first in the first main supply electricity loop and power between the input of branch road group; The tertiary winding and the 4th winding are arranged at respectively secondary winding and second in the second main supply electricity loop and power between the input of branch road group.
Accordingly, this circuit also can expand in the various situations that comprise at least one first power supply branch road group and at least one the second power supply branch road group in the multi-path constant-current drive circuit of the present invention, perhaps, also can expand to the situation that comprises at least two first power supply branch road groups or at least two second power supply branch road groups in the multi-path constant-current drive circuit of the present invention.For example, shown in Fig. 9 b～Fig. 9 c, and then the circuit shown in Fig. 9 a can also expand to main transformer and comprise a former limit winding and a plurality of secondary winding, and the perhaps situation of a plurality of former limit windings and a plurality of secondary windings is shown in Fig. 9 d～9e.Here repeat no more.
In addition, the converter of DC/AC described in the present embodiment also can be bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein, specifically referring to Fig. 6 a～Fig. 6 e, repeat no more here.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (20)
1. a multi-path constant-current drive circuit is characterized in that, comprising: DC/AC converter, main transformer and at least two rectification filtering units;
The DC/AC converter provides alternating voltage for main transformer; Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding;
Described at least two rectification filtering units form current supply circuit with the secondary winding of main transformer respectively; Each current supply circuit comprises: the first commutating circuit and the second commutating circuit, and described the first commutating circuit and the second commutating circuit are respectively applied to carry out the rectification of positive-negative half-cycle alternating voltage; Described the first winding and the second winding lay respectively at described the first commutating circuit and the second commutating circuit;
A current-sharing transformer is set between first current supply circuit at adjacent rectification filtering unit place and the second current supply circuit, described current-sharing transformer comprises four windings, lay respectively in the commutating circuit that the first current supply circuit and the second current supply circuit comprise, be used for realizing the current-sharing between the different commutating circuits at adjacent rectification filtering unit place.
2. circuit according to claim 1, it is characterized in that, in four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
3. circuit according to claim 1 is characterized in that, described rectification filtering unit comprises the first diode, the second diode and the first electric capacity; Then,
Described current supply circuit comprises: the Same Name of Ends of the first winding of secondary winding is by successively the first diode and the first electric capacity different name end of connecting the first winding of serial connection, the Same Name of Ends of the first winding of the anodic bonding secondary winding of the first diode; First electric capacity of the Same Name of Ends of the second winding of secondary winding by serial connection successively be connected diode and connect the different name end of the second winding, the different name end of the second winding of the anodic bonding secondary winding of described the second diode.
4. circuit according to claim 3 is characterized in that:
In the current supply circuit at the first rectification filtering unit place, the first winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first electric capacity of the first winding of secondary winding; The second winding of described current-sharing transformer is serially connected with between the different name end and the first electric capacity of the second winding of secondary winding;
In the current supply circuit at the second rectification filtering unit place, the tertiary winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first electric capacity of the first winding of secondary winding; The 4th winding of described current-sharing transformer is serially connected with between the different name end and the first electric capacity of the second winding of secondary winding.
5. circuit according to claim 1 is characterized in that, described rectification filtering unit comprises: the 3rd diode, the 4th diode, the first inductance and the second electric capacity; Then,
Described current supply circuit comprises: the Same Name of Ends of the first winding of secondary winding connects the different name end of the first winding, the Same Name of Ends of the first winding of the anodic bonding secondary winding of the 3rd diode by the 3rd diode, the first inductance and the second electric capacity that is connected in series successively; The Same Name of Ends of the second winding of secondary winding connects the different name end of the second winding, the different name end of the second winding of the anodic bonding secondary winding of described the 4th diode by the second electric capacity, the first inductance and the 4th diode that is connected in series successively.
6. circuit according to claim 5 is characterized in that,
In the current supply circuit at the first rectification filtering unit place, the first winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first inductance of the first winding of secondary winding; The second winding of described current-sharing transformer is serially connected with between the different name end and the first inductance of the second winding of secondary winding;
In the current supply circuit at the second rectification filtering unit place, the tertiary winding of described current-sharing transformer is serially connected with between the Same Name of Ends and the first inductance of the first winding of secondary winding; The 4th winding of described current-sharing transformer is serially connected with between the different name end and the first inductance of the second winding of secondary winding.
7. according to claim 1 to 6 each described circuit, it is characterized in that, described main transformer comprises a former limit winding and the secondary winding with tap; Then,
This secondary winding with tap forms current supply circuit with each described rectification filtering unit respectively.
8. according to claim 1 to 6 each described circuit, it is characterized in that, described main transformer comprises a former limit winding and at least two secondary windings with tap, the corresponding rectification filtering unit of each secondary winding; Then,
The rectification filtering unit that each secondary winding is corresponding with this secondary winding forms current supply circuit.
9. according to claim 1 to 6 each described circuit, it is characterized in that, described main transformer comprises at least two former limit windings and at least two secondary windings with tap, and former limit winding, secondary winding and rectification filtering unit are corresponding one by one; Then,
The rectification filtering unit that each secondary winding is corresponding with this secondary winding forms current supply circuit.
10. according to claim 1 to 4 each described circuit, it is characterized in that, described DC/AC converter is bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.
11. a multi-path constant-current drive circuit is characterized in that, comprising: DC/AC converter, main transformer;
The DC/AC converter provides alternating voltage for main transformer;
Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding; Have at least one secondary winding in the secondary winding of described main transformer, each the secondary winding correspondence in described at least one secondary winding is the two-stage current supply circuit at least;
Every one-level current supply circuit of described secondary winding comprises: the first commutating circuit and the second commutating circuit; The first commutating circuit comprises: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding by the first winding of the common corresponding current-sharing transformer of the tertiary winding of rectification filtering unit, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit; The second commutating circuit comprises: the first end of the second winding of this secondary winding is by the 4th winding of the second winding of the common corresponding current-sharing transformer of current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end of the first winding that rectification filtering unit connects described secondary winding;
Described current-sharing transformer comprises four windings, for the current-sharing between the different commutating circuits of realizing adjacent rectification filtering unit place.
12. circuit according to claim 11, it is characterized in that, in four windings of described current-sharing transformer, the Same Name of Ends of the first winding and the second winding flows through opposite electric current, the Same Name of Ends of the first winding and the tertiary winding flows through opposite electric current, and the Same Name of Ends of the tertiary winding and the 4th winding flows through opposite electric current.
13. circuit according to claim 11 is characterized in that, described rectification filtering unit comprises the first diode, the second diode and the first electric capacity.
14. circuit according to claim 13, it is characterized in that, the first commutating circuit comprises: the first winding of the first end of the first winding of this secondary winding current-sharing transformer that the tertiary winding by all current-sharing transformers of arranging in the current supply circuits at different levels before, the first diode, current supply circuit at the corresponding levels and next stage current supply circuit are common corresponding successively and the second end of the first winding that the first electric capacity connects described secondary winding;
The second commutating circuit comprises: the first end of the second winding of this secondary winding successively the 4th winding of the second winding by the common corresponding current-sharing transformer of the first electric capacity, current supply circuit at the corresponding levels and next stage current supply circuit, the second diode and all current-sharing transformers of arranging in the current supply circuits at different levels before connects the second end of the first winding of described secondary winding.
15. circuit according to claim 13, it is characterized in that, the first commutating circuit comprises: the first end of the first winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the first winding, the first diode and first electric capacity of the common corresponding current-sharing transformer of the tertiary winding of all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit;
The second commutating circuit comprises: the first end of the second winding of this secondary winding connects the second end of the first winding of described secondary winding successively by the 4th winding of the second winding of the common corresponding current-sharing transformer of the first electric capacity, the second diode, current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before.
16. to 15 each described circuit, it is characterized in that according to claim 11, described main transformer is:
The transformer that comprises a former limit winding and a secondary winding; Perhaps,
The transformer that comprises a former limit winding and at least two secondary windings; Perhaps,
Comprise at least two former limit windings and at least two secondary windings, and former limit winding and secondary winding be transformer one to one.
17. according to claim 11 to 15 each described circuit, it is characterized in that, described DC/AC converter is bridge circuit, push-pull circuit, circuit of reversed excitation, forward converter, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein.
18. a multi-path constant-current drive circuit is characterized in that, comprising: DC/AC converter, main transformer;
The DC/AC converter provides alternating voltage for main transformer;
Described main transformer comprises at least one with the secondary winding of tap, and described tap is divided into the first winding and the second winding with the secondary winding of correspondence, and the different name end of the first winding is connected with the Same Name of Ends of the second winding; Shown in the secondary winding of main transformer be connected with at least two power supply branch road groups, consist of respectively main supply electricity loop;
Between two adjacent main supply electricity loops a current-sharing transformer is set; The first winding of current-sharing transformer and the second winding are arranged in the main supply electricity loop in described two main supply electricity loop, and the tertiary winding and the 4th winding are arranged in another main supply electricity loop in described two main supply electricity loop, are used for carrying out two current-sharings between the main supply electricity loop.
19. circuit according to claim 18 is characterized in that, at least one main supply electricity loop in described two main supply electricity loop comprises: two-stage current supply circuit at least, and every one-level current supply circuit comprises: the first commutating circuit and the second commutating circuit; The first commutating circuit comprises: the first end of the first winding of corresponding secondary winding connects the second end of the first winding of described secondary winding by the first winding of the common corresponding current-sharing transformer of the tertiary winding of rectification filtering unit, all current-sharing transformers of arranging in the current supply circuits at different levels before, current supply circuit at the corresponding levels and next stage current supply circuit; The second commutating circuit comprises: the first end of the second winding of this secondary winding is by the 4th winding of the second winding of the common corresponding current-sharing transformer of current supply circuit at the corresponding levels and next stage current supply circuit, all current-sharing transformers of arranging in the current supply circuits at different levels before and the second end of the first winding that rectification filtering unit connects described secondary winding; Described current-sharing transformer comprises four windings, for the current-sharing between the different commutating circuits of realizing adjacent rectification filtering unit place.
20. circuit according to claim 18, it is characterized in that, at least one main supply electricity loop in described two main supply electricity loop comprises: at least two current supply circuits, each current supply circuit is made of with the corresponding secondary winding of main transformer a rectification filtering unit, comprise the first commutating circuit and the second commutating circuit, the first winding and second winding of corresponding secondary winding lay respectively in described the first commutating circuit and the second commutating circuit, and described the first commutating circuit and the second commutating circuit are respectively applied to carry out the rectification of positive-negative half-cycle alternating voltage; A current-sharing transformer is set between first current supply circuit at adjacent rectification filtering unit place and the second current supply circuit, described current-sharing transformer comprises four windings, lay respectively in the commutating circuit that the first current supply circuit and the second current supply circuit comprise, be used for realizing the current-sharing between the different commutating circuits at adjacent rectification filtering unit place.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102464943A CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910225966A CN101702854A (en) | 2009-11-21 | 2009-11-21 | Circuit for multi-path LED constant current driving |
| CN200910225966.4 | 2009-11-21 | ||
| CN2010102464943A CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
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| CN101902860A CN101902860A (en) | 2010-12-01 |
| CN101902860B true CN101902860B (en) | 2013-01-16 |
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| CN2010102464799A Ceased CN101902859B (en) | 2009-11-21 | 2010-08-03 | Multi-path constant-current drive circuit |
| CN2010102464943A Active CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
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| CN2010102464799A Ceased CN101902859B (en) | 2009-11-21 | 2010-08-03 | Multi-path constant-current drive circuit |
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| CN101064475A (en) * | 2006-04-28 | 2007-10-31 | 台达电子工业股份有限公司 | Multi-output DC-DC converter having improved cross modulated performance |
| KR20090018765A (en) * | 2007-08-18 | 2009-02-23 | 주식회사 뉴파워 프라즈마 | Current balancing circuit for driving multi-lamp |
| CN201766747U (en) * | 2009-11-21 | 2011-03-16 | 英飞特电子（杭州）有限公司 | Multiple constant-current driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101902860A (en) | 2010-12-01 |
| CN101702854A (en) | 2010-05-05 |
| CN101902859A (en) | 2010-12-01 |
| CN101902859B (en) | 2012-12-12 |
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Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Applicant after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Applicant before: Inventronics (Hangzhou) Co., Ltd. |
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Application publication date: 20101201 Assignee: Dongguan East Standard Electronic Technology Co., Ltd. Assignor: LED One (Hangzhou) Co.,Ltd. Contract record no.: 2019330000070 Denomination of invention: Multi-path constant-current drive circuit Granted publication date: 20130116 License type: Exclusive License Record date: 20190715 |