CN102348309B - Multi-path direct current power supply circuit - Google Patents
Multi-path direct current power supply circuit Download PDFInfo
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- CN102348309B CN102348309B CN201010246495.8A CN201010246495A CN102348309B CN 102348309 B CN102348309 B CN 102348309B CN 201010246495 A CN201010246495 A CN 201010246495A CN 102348309 B CN102348309 B CN 102348309B
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Abstract
The invention discloses a multi-path direct current power supply circuit, which comprises a master transformer and a first rectification filtering unit. The master transformer comprises a primary winding and a secondary winding. The primary winding of the master transformer and a first switch are connected in series with input voltage. The secondary winding of the master transformer, the first rectification filtering unit and a current sharing capacitor form a power supply loop. In the first rectification filtering unit, a first input end is connected with the second input end of the first rectification filtering unit sequentially by a first diode, a second capacitor and a fourth diode, and a second input end is connected with the first input end of the first rectification filtering unit sequentially by a third diode, a first inductor, a first capacitor and a second diode. The multi-path direct current power supply circuit can be applied to low-cost occasions in which the primary sides of the master transformers are provided with only one switching tube respectively.
Description
Technical field
The present invention relates to direct current supply technology, relate in particular to a kind of multi-channel DC power supply circuits.
Background technology
At present, the LED constant current driving for multichannel light-emitting diode (LED) is controlled, and the most frequently used scheme is constant voltage module+multichannel non-isolation DC/DC constant flow module.
Be illustrated in figure 1 the LED constant-current control circuit that in prior art, LED multi-path drives.In this circuit, input voltage Vac does separately constant current as input ，Mei road non-isolation DC/DC constant flow module of multichannel non-isolation DC/DC constant flow module and controls after constant voltage module.But because the voltage of constant voltage module and the voltage of LED generally have larger pressure reduction, so the efficiency 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, cost is higher.
Application number is in 200910155848.0 Chinese patent, a kind of drive circuit of realizing two paths of LED accurate constant current is provided, concrete circuit structure as shown in Figure 2, but in this drive circuit, the former limit of transformer adopts the structure of dual switch, alternate conduction by switching tube S1, S2 produces alternating voltage at the secondary of transformer, thereby realizes the power supply of this drive circuit.Because dual switch is used on the former limit of main transformer in this drive circuit, need complicated drive circuit, therefore, realize cost higher; And above-mentioned drive circuit is not also suitable for the occasion of only having a switching tube such as the former limit of the main transformers such as inverse-excitation converting circuit.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is, a kind of multi-channel DC power supply circuits are provided, and goes for the low-cost occasion that the former limit of main transformer only has a switching tube.
For this reason, the embodiment of the present invention adopts following technical scheme:
The invention provides a kind of two-way DC power-supply circuit, comprising: main transformer and first rectification filtering unit; Wherein,
Described main transformer comprises Yi Geyuan limit winding and a secondary winding; Former limit winding and first switch series of main transformer are connected to input voltage;
The secondary winding of main transformer and the first rectification filtering unit and a current-sharing electric capacity form current supply circuit;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
Wherein, the anodic bonding of the second diode and the 4th diode; Or,
The first diode is connected with the negative electrode of the 3rd diode.
Described current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
Power supply circuits, comprising: main transformer and at least two the first rectification filtering units; Wherein, described main transformer comprises Yi Geyuan limit winding and a secondary winding, and described former limit winding and the first switch series are connected to input voltage;
Corresponding first current supply circuit of each first rectification filtering unit; Described in each, the first current supply circuit consists of the secondary winding of main transformer, first rectification filtering unit and a current-sharing electric capacity;
Between two adjacent the first current supply circuits, the first current-sharing transformer is set; Two windings of this first current-sharing transformer lay respectively in two the first current supply circuits, for carrying out the current-sharing of two the first current supply circuit electric currents;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
Wherein, the anodic bonding of described the second diode and the 4th diode; Or,
Described the first diode is connected with the negative electrode of the 3rd diode.
Described the first current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described the first current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
Two windings of described the first current-sharing transformer are arranged at respectively in corresponding the first current supply circuit between the different name end of secondary winding and the first input end of the first rectification filtering unit,
Or two windings of described the first current-sharing transformer are arranged at respectively in corresponding the first current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit.
Also comprise: the second rectification filtering unit being formed by the 5th diode and the 3rd capacitances in series; Wherein,
The secondary winding of the second rectification filtering unit and main transformer forms the second current supply circuit; Between described the second current supply circuit and adjacent first current supply circuit, a current-sharing transformer is set, the first winding of this current-sharing transformer is arranged in the first current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the first current supply circuit and the second current supply circuit electric current.
Power supply circuits, comprising: main transformer, and described main transformer comprises Yi Geyuan limit winding and at least two secondary windings; Described former limit winding and the first switch series are connected to input voltage;
Corresponding first rectification filtering unit of each secondary winding and a current-sharing electric capacity, form the 3rd current supply circuit;
Between two adjacent the 3rd current supply circuits, the 3rd current-sharing transformer is set; Two windings of the 3rd current-sharing transformer lay respectively in two the 3rd current supply circuits, for carrying out the current-sharing of two the 3rd current supply circuit electric currents;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
Wherein, the anodic bonding of described the second diode and the 4th diode; Or,
Described the first diode is connected with the negative electrode of the 3rd diode.
Described the 3rd current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described the 3rd current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
Two windings of described the 3rd current-sharing transformer are arranged at respectively in corresponding the 3rd current supply circuit between the different name end of secondary winding and the first input end of the first rectification filtering unit;
Or two windings of described the 3rd current-sharing transformer are arranged at respectively in corresponding the 3rd current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit.
Also comprise: the second rectification filtering unit being formed by the 5th diode and the 3rd capacitances in series; Wherein,
A secondary winding of the corresponding main transformer of the second rectification filtering unit, forms the second current supply circuit with this secondary winding; Between described the second current supply circuit and adjacent the 3rd current supply circuit, a current-sharing transformer is set, the first winding of this current-sharing transformer is arranged in the 3rd current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the 3rd current supply circuit and the second current supply circuit electric current.
Technique effect for technique scheme is analyzed as follows:
Above two-way DC power-supply circuit Zhong，Yuan limit only has first switch can realize the current-sharing of secondary multichannel output, realizes cost low; And during due to former limit the first switch conduction and shutoff, secondary is powered to DC load by the different rectification filtering circuit of two-way, can realize the two-way utilization of main transformer, reduces volume of transformer, raises the efficiency; Current-sharing electric capacity and the first inductance form resonant tank, can realize the Zero Current Switch of secondary rectification filtering circuit, reduce diode reverse recovery loss, are conducive to reduce battery and disturb (EMI).
Accompanying drawing explanation
Fig. 1 is prior art LED constant-current control circuit structural representation;
Fig. 2 is a kind of two paths of LED accurate constant current of prior art driving circuit structure schematic diagram;
Fig. 3 is the first two-way DC power-supply circuit structural representation of the present invention;
Fig. 3 a is the another kind of two-way DC power-supply circuit of the present invention structural representation;
Fig. 4 is the first even number of the present invention road multi-channel DC power supply circuit construction schematic diagram;
Fig. 4 a is the second even number of the present invention road multi-channel DC power supply circuit construction schematic diagram;
Fig. 4 b is the first odd number of the present invention road multi-channel DC power supply circuit construction schematic diagram;
Fig. 4 c is the second odd number of the present invention road multi-channel DC power supply circuit construction schematic diagram;
Fig. 5 a is the third even number road multi-channel DC power supply circuit construction schematic diagram of the present invention;
Fig. 5 b is the third odd number road multi-channel DC power supply circuit construction schematic diagram of the present invention;
Fig. 6 is the second two-way DC power-supply circuit structural representation of the present invention.
Embodiment
Below, be described with reference to the accompanying drawings the realization of embodiment of the present invention multi-channel DC power supply circuits.
As shown in Figure 3, the embodiment of the present invention provides a kind of two-way DC power-supply circuit, wherein, comprises main transformer Ta1 and first rectification filtering unit; Wherein,
Main transformer Ta1 comprises Yi Geyuan limit winding and a secondary winding; Main transformer Ta1Yuan limit winding and the first switch S 1 are serially connected with between the positive and negative terminal of input voltage Vdc; The different name end of the secondary winding of main transformer Ta1 connects the first input end t1 of the first rectification filtering unit, and the second input t2 of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing capacitor C d1, thereby forms current supply circuit; Certainly, in actual applications, current-sharing capacitor C d1 also can be connected between the different name end of secondary winding and the first input end t1 of the first rectification filtering unit, can realize the present invention too.
Described the first rectification filtering unit comprises: the first input end t1 of the first rectification filtering unit connects the second input t2 of the first rectification filtering unit successively by the first diode D1, the second capacitor C 2 and the 4th diode D4; The second input t2 of the first rectification filtering unit connects the first input end t1 of the first rectification filtering unit successively by the 3rd diode D3, the first inductance L 1, the first capacitor C 1 and the second diode D2.
Wherein, the second diode D2 can be connected with the anode of the 4th diode D4, or, the negative electrode of the first diode D1 and the 3rd diode D3 can be connected, in circuit, the negative electrode of the 6th diode D6 and the 8th diode D8 interconnects as shown in Figure 6, now, still can realize described circuit of the present invention.
Wherein, the two ends of the first capacitor C 1 of the first rectification filtering unit can be used as the first output O1 and the second output O2 of the first rectification filtering unit, are used to the first DC load branch road A1 power supply; The two ends of the second capacitor C 2 of the first rectification filtering unit, as the 3rd output O3 and the 4th output O4 of the first rectification filtering unit, are used to the second DC load branch road A2 power supply.
The above-mentioned DC load branch road LED load branch that several LED form of can serving as reasons can certainly be other DC load branch roads that consist of DC load.
The principle of the two-way DC power-supply circuit shown in Fig. 3 is:
When first switch S 1 on Dang Yuan limit is turn-offed, the first rectification filtering circuit that the first diode D1 of secondary, the 4th diode D4 and the first capacitor C 1 form, give the first DC load branch road A1 power supply, during first switch S 1 conducting on Dang Yuan limit, the second diode D2 of secondary, the 3rd diode D3 and the first inductance L 1 and the second capacitor C 2 form the second rectification filtering circuit, give the second DC load branch road A2 power supply, described current-sharing capacitor C d1 is connected on the input of two-way rectification filtering circuit.Together with the anodic bonding of the second diode D2 and the 4th diode D4, be called common anodic bonding.
Due to the existence of current-sharing capacitor C d1, when the pressure drop of two-way DC load branch road is different, can, by the voltage difference of current-sharing capacitor C d1 balance two-way DC load branch road, make the current average of two-way DC load branch road equal.
Above two-way DC power-supply circuit Zhong，Yuan limit only has first switch S 1 can realize the current-sharing of secondary multichannel output, realizes cost low; And during due to former limit the first switch S 1 turn-on and turn-off, secondary is powered to DC load by the different rectification filtering circuit of two-way, can realize the two-way utilization of main transformer, reduces volume of transformer, raises the efficiency; In addition, magnetic core of transformer only needs very little air gap, and inductance value is larger, and leakage inductance Hen little ，Yuan limit is very little as the spike stress of the switching tube of the first switch, does not need extra absorption circuit.Current-sharing capacitor C d1 and the first inductance L 1 form resonant tank, can realize the Zero Current Switch of secondary rectification filtering circuit, reduce diode reverse recovery loss, are conducive to reduce EMI.
In addition, the leakage inductance Lr of main transformer Ta1 also can participate in the resonance of current-sharing capacitor C d1 and the first inductance L 1, in some occasion, by controlling the size of the leakage inductance Lr of main transformer Ta1, it is suitable value, the first inductance L 1 even can be removed, and as shown in Figure 3 a, no longer describes in detail here.
In addition, the circuit shown in Fig. 3 can also be used to power factor correcting circuit, and input voltage Vdc is the voltage with low frequency pulsating.
Two-way DC power-supply circuit shown in Fig. 3 can also expand to multi-channel DC power supply circuits, is divided into: the multi-channel DC power supply circuits on even number road and the multi-channel DC power supply circuits on odd number road; Wherein,
As shown in Figure 4, for the multi-channel DC power supply circuit construction schematic diagram on a kind of even number road, comprising at least two the first rectification filtering units; And in this circuit, main transformer Ta1 comprises Yi Geyuan limit winding and a secondary winding;
Corresponding first current supply circuit of each first rectification filtering unit; Described the first current supply circuit comprises: the different name end of main transformer Ta1 secondary winding connects the first input end t1 of the first rectification filtering unit, and the second input t2 of the first rectification filtering unit connects the Same Name of Ends of secondary winding by a current-sharing capacitor C d1.Certainly, in actual applications, current-sharing capacitor C d1 also can be connected between the different name end of secondary winding and the first input end t1 of the first rectification filtering unit, thereby forms described the first current supply circuit.
Now, between two adjacent the first current supply circuits, be provided with first current-sharing transformer; Two windings of this first current-sharing transformer lay respectively in two the first current supply circuits, concrete, between the first input end t1 of the different name end that each winding is arranged at respectively main transformer Ta1 secondary winding and the first corresponding rectification filtering unit, and, its connection need make the Same Name of Ends of two windings of current-sharing transformer, the current opposite in direction flowing through at synchronization; Described the first current-sharing transformer is used for: carry out the current-sharing of two the first current supply circuit electric currents.Or, two windings of described the first current-sharing transformer also can be arranged at respectively in corresponding the first current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit, and, its connection need make the Same Name of Ends of two windings of current-sharing transformer, the current opposite in direction flowing through at synchronization, at this moment can realize the current-sharing of electric current in two the first current supply circuits equally.
In circuit shown in Fig. 4, the current-sharing principle of the first current-sharing transformer is: two windings of the first current-sharing transformer are connected in series respectively in adjacent duplex feeding loop.Two-way in-phase current flows through respectively Same Name of Ends and the non-same polarity of two windings of current-sharing transformer; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two Motor Winding Same Name of Ends of current-sharing transformer and non-same polarity is not equal to m: during n, the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at current-sharing transformer two ends is by the pressure reduction of two circuit units of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby the current balance of realizing between adjacent duplex feeding loop is controlled; When m=n, realize the sharing control of two circuit units.
In even number road multi-channel DC power supply circuits shown in Fig. 4, each first rectification filtering unit can be powered for two-way DC load branch road.Electric current between two rectification filtering circuits that each current supply circuit comprises carries out current-sharing by current-sharing electric capacity; And electric current between different current supply circuits carries out current-sharing by current-sharing transformer.
In addition, in actual applications can also be by the plus earth of the second diode and the 4th diode, now, as shown in Fig. 4 a, between the first adjacent current supply circuit, also need to arrange second current-sharing transformer, between the second input of the Same Name of Ends that two windings of this second current-sharing transformer are arranged at respectively secondary winding in the first corresponding current supply circuit and the first corresponding rectification filtering unit, concrete, in the circuit of Fig. 4 a, described two windings are arranged at respectively between corresponding secondary Motor Winding Same Name of Ends and current-sharing electric capacity, to realize the electric current current-sharing between adjacent the first current supply circuit.
In addition, as shown in Fig. 4 b and 4c, be the DC power-supply circuit on odd number road, this circuit structure is similar with the multi-channel DC power supply circuits on the even number road shown in Fig. 4 and Fig. 4 a respectively, and difference is, also comprises:
By the 5th diode D5 and the 3rd capacitor C 3 second rectification filtering unit in series; The secondary winding of this second rectification filtering unit and main transformer Ta1 forms the second current supply circuit; Between described the second current supply circuit and adjacent first current supply circuit, a current-sharing transformer Tw is set, the first winding of this current-sharing transformer Tw is arranged in the first current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the first current supply circuit and the second current supply circuit electric current.
In addition, as Fig. 5 a, the main transformer Ta1 in Fig. 4 a can also replace with the main transformer Ta2 that comprises Yi Geyuan limit winding and at least two secondary windings, now,
Corresponding first rectification filtering unit of each secondary winding and a current-sharing electric capacity, form respectively the 3rd current supply circuit; Described the 3rd current supply circuit comprises: the different name end of secondary winding connects the first input end t1 of the first corresponding rectification filtering unit, and the second input t2 of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Between two adjacent the 3rd current supply circuits, the 3rd current-sharing transformer is set; Two windings of the 3rd current-sharing transformer lay respectively in two the 3rd current supply circuits, for carrying out the current-sharing of two the 3rd current supply circuit electric currents.Concrete, described the 3rd current-sharing transformer is arranged at respectively between the different name end of secondary winding and the first input end of the first rectification filtering unit.Or, two windings of described the 3rd current-sharing transformer also can be arranged at respectively in the 3rd corresponding current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit, and, its connection need make the Same Name of Ends of two windings of current-sharing transformer, the current opposite in direction flowing through at synchronization, at this moment can realize the current-sharing of electric current in two the 3rd current supply circuits equally.
As shown in Figure 5 a, the anode of described the second diode D2 in each first rectification filtering unit and the 4th diode D4 can ground connection.
As shown in Figure 5 b, when main transformer Ta2 is while comprising the transformer of Yi Geyuan limit winding and at least two secondary windings, also can expand to the multi-channel DC power supply circuits on odd number road, wherein, by the 5th diode D5 and the 3rd capacitor C 3 the second rectification filtering unit in series also a secondary winding of corresponding main transformer Ta2, form the second current supply circuit with this secondary winding; Between described the second current supply circuit and adjacent the 3rd current supply circuit, a current-sharing transformer is set, the first winding of this current-sharing transformer is arranged in the 3rd current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the 3rd current supply circuit and the second current supply circuit electric current.Same, in the circuit shown in Fig. 5 b, the second diode D2 in the first rectification filtering unit and the anode of the 4th diode D4 can ground connection.
In above Fig. 3～Fig. 5 b, two-way DC load branch road is anodic bonding altogether, as shown in Figure 6, provides a kind of two-way DC power-supply circuit, and two-way DC load branch road common cathode connects.As shown in Figure 6, this circuit comprises:
Main transformer Ta1 comprises Yi Geyuan limit winding and a secondary winding; Main transformer Ta1Yuan limit winding and the first switch S 1 are serially connected with input voltage Vdc; The different name end of the secondary winding of main transformer Ta1 connects the first input end t1 of the 3rd rectification filtering unit, and the second input t2 of the 3rd rectification filtering unit connects the Same Name of Ends of this secondary winding by a current-sharing capacitor C d;
Described the 3rd rectification filtering unit comprises: the first input end t1 of the 3rd rectification filtering unit connects the second input t2 of the 3rd rectification filtering unit successively by the 6th diode D6, the 4th capacitor C 4 and the 9th diode D9; The second input t2 of the 3rd rectification filtering unit connects the first input end t1 of the 3rd rectification filtering unit successively by the 8th diode D8, the 5th capacitor C 5, the second inductance L 2 and the 7th diode D7; And the 6th diode D6 is connected with the negative electrode of the 8th diode D8, is called common cathode and connects.
Wherein, the two ends of the 4th capacitor C 4 of the 3rd rectification filtering unit, as the first output O1 and the second output O2 of the 3rd rectification filtering unit, are used to the first DC load branch road power supply; The two ends of the 5th capacitor C 5 of the 3rd rectification filtering unit, as the 3rd output and the 4th output of the 3rd rectification filtering unit, are used to the second DC load branch road power supply.
Current-sharing principle and Fig. 3 of Fig. 6 are similar, repeat no more here.
In addition, corresponding with Fig. 4 a～Fig. 5 b, the two-way DC power-supply circuit shown in Fig. 6 also can expand to the multi-channel DC power supply circuits on even number road and the multi-channel DC power supply circuits on odd number road; Wherein,
When main transformer only includes Yi Geyuan limit winding and a secondary winding, described in Fig. 6, the circuit structure of even number road multi-channel DC power supply circuits corresponding to two-way DC power-supply circuit is similar to Fig. 4, the circuit structure of odd number road multi-channel DC power supply circuits is similar to Fig. 4 b, and difference is only the first rectification filtering unit in Fig. 4 and Fig. 4 b to replace with the 3rd rectification filtering unit.
When main transformer comprises Yi Geyuan limit winding and at least two secondary windings, the circuit structure of the even number road multi-channel DC power supply circuits that the two-way DC power-supply circuit of Fig. 6 is corresponding is similar to Fig. 5 a, the circuit structure of odd number road multi-channel DC power supply circuits is similar to Fig. 5 b, difference is only: the first rectification filtering unit in Fig. 5 a and Fig. 5 b is replaced with to the 3rd rectification filtering unit, and the negative electrode of the 6th diode D6 and the 8th diode D8 is earth-free.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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 (13)
1. a two-way DC power-supply circuit, is characterized in that, comprising: main transformer and first rectification filtering unit; Wherein,
Described main transformer comprises Yi Geyuan limit winding and a secondary winding; Former limit winding and first switch series of main transformer are connected to input voltage;
The secondary winding of main transformer and the first rectification filtering unit and a current-sharing electric capacity form current supply circuit;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
2. circuit according to claim 1, is characterized in that, the anodic bonding of the anode of the second diode and the 4th diode; Or,
The negative electrode of the first diode is connected with the negative electrode of the 3rd diode.
3. circuit according to claim 1 and 2, it is characterized in that, described current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
4. multi-channel DC power supply circuits, is characterized in that, comprising: main transformer and at least two the first rectification filtering units; Wherein, described main transformer comprises Yi Geyuan limit winding and a secondary winding,
Described former limit winding and the first switch series are connected to input voltage;
Corresponding first current supply circuit of each first rectification filtering unit; Described in each, the first current supply circuit consists of the secondary winding of main transformer, first rectification filtering unit and a current-sharing electric capacity;
Between two adjacent the first current supply circuits, the first current-sharing transformer is set; Two windings of this first current-sharing transformer lay respectively in two the first current supply circuits, for carrying out the current-sharing of two the first current supply circuit electric currents;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
5. circuit according to claim 4, is characterized in that, the anodic bonding of the anode of described the second diode and the 4th diode; Or,
The negative electrode of described the first diode is connected with the negative electrode of the 3rd diode.
6. circuit according to claim 4, it is characterized in that, described the first current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described the first current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
7. circuit according to claim 6, is characterized in that, two windings of described the first current-sharing transformer are arranged at respectively in corresponding the first current supply circuit between the different name end of secondary winding and the first input end of the first rectification filtering unit,
Or two windings of described the first current-sharing transformer are arranged at respectively in corresponding the first current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit.
8. according to the circuit described in claim 4 to 7 any one, it is characterized in that, also comprise: the second rectification filtering unit being formed by the 5th diode and the 3rd capacitances in series; Wherein,
The secondary winding of the second rectification filtering unit and main transformer forms the second current supply circuit; Between described the second current supply circuit and adjacent first current supply circuit, a current-sharing transformer is set, the first winding of this current-sharing transformer is arranged in the first current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the first current supply circuit and the second current supply circuit electric current.
9. multi-channel DC power supply circuits, is characterized in that, comprising: main transformer, and described main transformer comprises Yi Geyuan limit winding and at least two secondary windings; Described former limit winding and the first switch series are connected to input voltage;
Corresponding first rectification filtering unit of each secondary winding and a current-sharing electric capacity, form the 3rd current supply circuit;
Between two adjacent the 3rd current supply circuits, the 3rd current-sharing transformer is set; Two windings of the 3rd current-sharing transformer lay respectively in two the 3rd current supply circuits, for carrying out the current-sharing of two the 3rd current supply circuit electric currents;
Described the first rectification filtering unit comprises: the first input end of the first rectification filtering unit connects the second input of the first rectification filtering unit by the first diode, the second electric capacity and the 4th diode of serial connection; The second input of the first rectification filtering unit connects the first input end of the first rectification filtering unit by the 3rd diode, the first inductance, the first electric capacity and second diode of serial connection.
10. circuit according to claim 9, is characterized in that, the anodic bonding of the anode of described the second diode and the 4th diode; Or,
The negative electrode of described the first diode is connected with the negative electrode of the 3rd diode.
11. circuit according to claim 9, it is characterized in that, described the 3rd current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit, and the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding by current-sharing electric capacity;
Or described the 3rd current supply circuit comprises: the different name end of the secondary winding of main transformer connects the first input end of the first rectification filtering unit by current-sharing electric capacity, the second input of the first rectification filtering unit connects the Same Name of Ends of this secondary winding.
12. circuit according to claim 11, is characterized in that, two windings of described the 3rd current-sharing transformer are arranged at respectively in corresponding the 3rd current supply circuit between the different name end of secondary winding and the first input end of the first rectification filtering unit;
Or two windings of described the 3rd current-sharing transformer are arranged at respectively in corresponding the 3rd current supply circuit between the Same Name of Ends of secondary winding and the second input of the first rectification filtering unit.
13. according to the circuit described in claim 9 to 12 any one, it is characterized in that, also comprises: the second rectification filtering unit consisting of the 5th diode and the 3rd capacitances in series; Wherein,
A secondary winding of the corresponding main transformer of the second rectification filtering unit, forms the second current supply circuit with this secondary winding; Between described the second current supply circuit and adjacent the 3rd current supply circuit, a current-sharing transformer is set, the first winding of this current-sharing transformer is arranged in the 3rd current supply circuit, the second winding is arranged in the second current supply circuit, for carrying out the current-sharing of the 3rd current supply circuit and the second current supply circuit electric current.
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| CN201010246495.8A CN102348309B (en) | 2010-08-03 | 2010-08-03 | Multi-path direct current power supply circuit |
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| CN202617457U (en) * | 2012-02-07 | 2012-12-19 | 深圳市比格利电源科技有限公司 | LED drive power supply and LED illumination lamp |
| CN108448980A (en) * | 2018-04-03 | 2018-08-24 | 辽宁石油化工大学 | A kind of novel speed change system |
| CN110504824B (en) * | 2019-09-05 | 2024-03-05 | 厦门厦华科技有限公司 | Dual-switching-tube-driven current equalizing circuit |
| CN111162660A (en) * | 2020-01-08 | 2020-05-15 | 毛昭祺 | Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit |
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| CN101702854A (en) * | 2009-11-21 | 2010-05-05 | 英飞特电子（杭州）有限公司 | Circuit for multi-path LED constant current driving |
| CN101772246A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
| CN101778506A (en) * | 2009-12-28 | 2010-07-14 | 英飞特电子（杭州）有限公司 | Drive circuit for realizing accurate constant current of multiple LEDs |
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| CN201766750U (en) * | 2010-08-03 | 2011-03-16 | 英飞特电子（杭州）有限公司 | Multi-way direct current supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101702854A (en) * | 2009-11-21 | 2010-05-05 | 英飞特电子（杭州）有限公司 | Circuit for multi-path LED constant current driving |
| CN101778506A (en) * | 2009-12-28 | 2010-07-14 | 英飞特电子（杭州）有限公司 | Drive circuit for realizing accurate constant current of multiple LEDs |
| CN101772246A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
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