CN113194569A

CN113194569A - Multi-path constant-current driving circuit and driving power supply

Info

Publication number: CN113194569A
Application number: CN202110385306.3A
Authority: CN
Inventors: 王小军
Original assignee: Shenzhen Li Chuangpu Power Supply Technology Co Ltd
Current assignee: Shenzhen Li Chuangpu Power Supply Technology Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-07-30
Also published as: WO2022213398A1

Abstract

The invention relates to a multi-channel constant current drive circuit and a drive power supply, comprising: the drive control unit, a plurality of equalizing circuits, a detection feedback circuit and a plurality of inductors, wherein the detection feedback circuit and the plurality of inductors are arranged corresponding to the equalizing circuits; the input end of the drive control unit is connected with an input signal, the output end of the drive control unit is respectively connected with the input ends of the plurality of equalizing circuits, the output ends of the plurality of equalizing circuits are respectively connected to the input ends of the plurality of loads, the detection end of each detection feedback circuit is connected with the corresponding equalizing circuit, and the output end of each detection feedback circuit is connected with the drive control unit; the inductors of two adjacent equalizing circuits are connected in series. The inductors in each equalizing circuit are equalized to realize multi-path equalizing output, and are regulated and controlled by the drive control unit to realize constant current drive; and the circuit has simple structure, reduces the cost of the power supply, and has good current balance and consistency and high reliability.

Description

Multi-path constant-current driving circuit and driving power supply

Technical Field

The invention relates to the technical field of constant current control, in particular to a multi-path constant current driving circuit and a driving power supply.

Background

In the field of power supplies, the realization of multi-path constant current output has become a market demand. Therefore, in order to meet the market demand, various power supplies capable of meeting the requirement of multi-path constant current output exist in the existing power supply scheme. The existing power supply schemes with multi-channel constant current output roughly classify three types:

the first type: and a plurality of switching power supplies are used for realizing multipath constant current and current control.

The second type: a constant voltage power supply is connected in series with a plurality of constant current switch power supplies.

In the third category: the method is realized by using a linear control current mode.

However, for the first category: complex assembly, high cost, and poor current balance and consistency. For the second class: the circuit cost is high, and the conversion efficiency is low. For the third class: the imbalance of the load is difficult to control, and the imbalance of the load is generally consumed in the form of heat, so that the reliability is very poor.

Disclosure of Invention

The present invention provides a multi-channel constant current driving circuit and a driving power supply, which are used for overcoming the above drawbacks of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a multi-path constant current driving circuit is constructed, and the multi-path constant current driving circuit comprises: the circuit comprises a drive control unit, a plurality of equalizing circuits, a detection feedback circuit and a plurality of inductors, wherein the detection feedback circuit is arranged corresponding to the equalizing circuits;

the input end of the driving control unit is connected with an input signal, the output end of the driving control unit is respectively connected with the input ends of the plurality of equalizing circuits, the output ends of the plurality of equalizing circuits are respectively connected with the input ends of the plurality of loads, the detection end of each detection feedback circuit is connected with the corresponding equalizing circuit, and the output end of each detection feedback circuit is connected with the driving control unit;

each balancing circuit processes the voltage signal output by the driving control unit and outputs the voltage signal to a load connected with the balancing circuit; the inductor is used for carrying out equalization processing on the voltage signals output by the driving control unit so as to enable the currents output by the equalization circuits to be the same;

each detection feedback circuit detects the voltage and current output by the corresponding equalizing circuit and outputs a feedback control signal to the drive control unit;

and the drive control unit adjusts the voltage signal according to the feedback control signal to realize constant current drive.

In the multi-channel constant current driving circuit of the present invention, the driving control unit includes: a switch control circuit and a voltage conversion circuit; the inductor is a current transformer;

the input end of the switch control circuit is connected with the input signal, the output end of the switch control circuit is connected with the input end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected with the input end of the equalization circuit;

the switch control circuit adjusts and controls the voltage conversion circuit according to the feedback control signal; and the voltage conversion circuit performs conversion processing on the input signal according to the adjustment control of the switch control circuit and outputs the voltage signal to the equalization circuit.

In the multi-channel constant current driving circuit of the present invention, each of the detection feedback circuits includes: a detection circuit and a feedback control circuit;

the detection circuit is used for detecting the voltage and the current output by the equalization circuit and outputting a detection signal;

the feedback control circuit is connected with the detection circuit, receives the detection signal and outputs a feedback control signal to the switch control circuit according to the detection signal.

In the multi-path constant current driving circuit of the present invention, the plurality of loads include: n sets of loads, each set of loads of the N sets of loads comprising: two sub-loads; n is an integer greater than or equal to 1;

the two sub-loads comprise a first sub-load and a second sub-load;

the plurality of equalization circuits includes: n first sub-equalization circuits and N second sub-equalization circuits;

the plurality of current transformers include: n-1 current transformers, wherein the N-1 current transformers are arranged corresponding to the N-1 first sub-equalization circuits;

each of the first sub-equalization circuits: the first blocking circuit, the first loop and the second loop;

the second sub-equalization circuit includes: a second DC blocking circuit, a third loop and a fourth loop;

the input end of a first blocking circuit in each first sub-equalization circuit is connected with the positive output end of the voltage conversion circuit, the output end of the first blocking circuit is connected with the input end of the first loop, the output end of the first loop is connected with a corresponding first sub-load, and the return end of the first loop is connected with the synonym end of a primary coil of a corresponding current transformer; the input end of the second loop is connected with the synonym end of the primary coil of the corresponding current transformer, the output end of the second loop is connected with the corresponding second sub-load, and the return end of the second loop is connected with the output end of the first blocking circuit;

the input end of the second blocking circuit is connected with the output end of the voltage conversion circuit, the output end of the second blocking circuit is connected with the input end of the third loop, the output end of the third loop is connected with the corresponding first sub-load, and the return end of the third loop is connected with the homonymous end of the secondary coil of the (N-1) th current transformer in the (N-1) th current transformer; the input end of the fourth loop is connected with the homonymous end of the secondary coil of the (N-1) th current transformer in the (N-1) current transformers, the output end of the fourth loop is connected with the corresponding second sub-load, and the return end of the fourth loop is connected with the output end of the second blocking circuit;

the dotted terminal of the secondary coil of the preceding current transformer in the two adjacent current transformers is connected with the dotted terminal of the primary coil of the subsequent current transformer, the dotted terminal of the primary coil of the first current transformer in the N-1 current transformers, and the dotted terminal of the secondary coil of each current transformer in the N-1 current transformers is connected with the negative output terminal of the voltage conversion circuit.

In the multi-channel constant current driving circuit of the present invention, the first blocking circuit and the second blocking circuit each include: a blocking capacitor; the first and third circuits each include: a first diode, a first capacitor and a third diode; the second loop and the fourth loop each include: a second diode, a second capacitor and a fourth diode;

in the first dc blocking circuit: a first end of the blocking capacitor is used as an input end of the first blocking circuit and connected with a positive output end of the voltage conversion circuit, a second end of the blocking capacitor is used as an output end of the second blocking circuit and connected with an anode of the first diode, a cathode of the first diode is connected with the first sub-load and a positive end of the first capacitor, a negative end of the first capacitor is connected with an anode of the third diode and a negative end of the second capacitor, and a cathode of the third diode is connected with a synonym end of a primary coil of the corresponding current transformer;

the cathode of the second diode is connected with the second end of the blocking capacitor, the anode of the second diode is connected with the anode of the third diode and the negative end of the second capacitor, the positive end of the second capacitor is connected with the cathode of the fourth diode, the cathode of the fourth diode is connected with the second sub-load, and the anode of the fourth diode is connected with the synonym end of the current transformer corresponding to the fourth diode;

the anode of the first diode is the input end of the first loop, the cathode of the first diode is the output end of the first loop, and the cathode of the third diode is the return end of the first loop; the cathode of the second diode is the return end of the second loop, the cathode of the fourth diode is the output end of the second loop, and the anode of the fourth diode is the input end of the second loop;

in the second dc blocking circuit: a first end of the blocking capacitor is used as an input end of the second blocking circuit and connected with a positive output end of the voltage conversion circuit, a second end of the blocking capacitor is used as an output end of the second blocking circuit and connected with an anode of the first diode, a cathode of the first diode is connected with the first sub-load and a positive end of the first capacitor, a negative end of the first capacitor is connected with an anode of the third diode and a negative end of the second capacitor, and a cathode of the third diode is connected with a homonymous end of a secondary coil of the (N-1) th current transformer;

the cathode of the second diode is connected with the second end of the blocking capacitor, the anode of the second diode is connected with the anode of the third diode and the negative end of the second capacitor, the positive end of the second capacitor is connected with the cathode of the fourth diode, the cathode of the fourth diode is connected with the second sub-load, and the anode of the fourth diode is connected with the dotted terminal of the secondary coil of the (N-1) th current transformer;

the anode of the first diode is the input end of the first loop, the cathode of the first diode is the output end of the first loop, and the cathode of the third diode is the return end of the first loop; the cathode of the second diode is the return end of the second loop, the cathode of the fourth diode is the output end of the second loop, and the anode of the fourth diode is the input end of the second loop.

In the multi-path constant current driving circuit of the present invention, the plurality of loads include: n loads; n is an integer greater than or equal to 2;

the plurality of equalization circuits includes: n-1 first sub-equalization circuits and Nth second sub-equalization circuits;

each of the first sub-equalization circuit and the nth second sub-equalization circuit includes: a full-bridge rectifier circuit;

the first input end of the full-bridge rectifying circuit in each first sub-equalizing circuit is connected with the dotted end of the secondary coil of the current transformer corresponding to the full-bridge rectifying circuit, the output end of the full-bridge rectifying circuit in each first sub-equalizing circuit is connected with the load corresponding to the full-bridge rectifying circuit, and the second input end of the full-bridge rectifying circuit in each first sub-equalizing circuit is connected with the negative output end of the voltage conversion circuit;

a first input end of a full-bridge rectification circuit in the second sub-equalization circuit is connected with a synonym end of a primary coil of an N-1 th current transformer in the N-1 current transformers, and a second input end of the full-bridge rectification circuit in the second sub-equalization circuit is connected with a negative output end of the voltage conversion circuit;

the synonym end of a secondary coil of a first current transformer of the N-1 current transformers is connected with the positive output end of the voltage conversion circuit, the synonym end of a primary coil of a preceding current transformer of the two adjacent current transformers is connected with the synonym end of a secondary coil of a subsequent current transformer, and the synonym end of a primary coil of the N-1 current transformers is connected with the positive output end of the voltage conversion circuit.

In the multi-path constant current driving circuit of the present invention, the full-bridge rectifier circuit includes: the first diode, the second diode, the third diode, the fourth diode and the first capacitor;

in the full-bridge rectifying circuit of the N-1 first sub-equalizing circuits: the anode of the first diode is connected with the dotted terminal of the secondary coil of the current transformer, the cathode of the first diode is connected with the cathode of the second diode and the positive terminal of the first capacitor, and the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load correspondingly connected with the connecting end; the negative end of the first capacitor is connected with the anode of the fourth diode and the anode of the third diode, the cathode of the fourth diode is connected with the homonymous end of the secondary coil of the current transformer corresponding to the fourth diode, the cathode of the third diode is connected with the anode of the second diode, and the connecting end of the cathode of the third diode and the cathode of the second diode is also connected with the negative output end of the voltage conversion circuit;

the anode of the first diode is the first input end of the full-bridge rectification circuit, the anode of the second diode is the second input end of the full-bridge rectification circuit, and the connecting end of the cathode of the first diode and the cathode of the second diode is the output end of the full-bridge rectification circuit;

in the full-bridge rectifying circuit of the second sub-equalizing circuit: the anode of the first diode is connected with the synonym end of the primary coil of the (N-1) th current transformer, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, and the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load correspondingly connected with the connecting end; the negative end of the first capacitor is connected with the anode of the fourth diode and the anode of the third diode, the cathode of the fourth diode is connected with the synonym end of the primary coil of the (N-1) th current transformer, and the cathode of the third diode is connected with the anode of the second diode;

the positive pole of the first diode is the first input end of the full-bridge rectification circuit, the positive pole of the second diode is the second input end of the full-bridge rectification circuit, and the connecting end of the negative pole of the first diode and the negative pole of the second diode is the output end of the full-bridge rectification circuit.

each of the first sub-equalization circuit and the nth second sub-equalization circuit includes: a full-wave rectifying circuit;

the first input ends of the full-wave rectifying circuits in the first sub-equalizing circuit and the second sub-equalizing circuit are connected with the positive output end of the voltage conversion circuit, the second input ends of the full-wave rectifying circuits in the first sub-equalizing circuit and the second sub-equalizing circuit are connected with the negative output end of the voltage conversion circuit, and the first output ends of the full-wave rectifying circuits in the first sub-equalizing circuit and the second sub-equalizing circuit are connected with corresponding loads;

a second output end of the full-wave rectifying circuit in the first sub-equalizing circuit is connected with a synonym end of a primary coil of a current transformer corresponding to the second output end, and a second output end of the full-wave rectifying circuit in the second sub-equalizing circuit is connected with a synonym end of a secondary coil of an N-1 current transformer in the N-1 current transformers;

the dotted terminal of the primary coil of the first current transformer in the N-1 current transformers is connected with the sub-output terminal of the voltage conversion circuit, the synonym terminal of the secondary coil of the N-1 current transformers is connected with the sub-output terminal of the voltage conversion circuit, and the dotted terminal of the secondary coil of the preceding current transformer of two adjacent current transformers is connected with the dotted terminal of the primary coil of the subsequent current transformer.

In the multi-path constant current driving circuit of the present invention, the full-wave rectifying circuit includes: the first diode, the second diode and the first capacitor;

in the full-wave rectifying circuit of the N-1 first sub-equalizing circuits: the anode of the first diode is connected with the positive output end of the voltage conversion circuit, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load corresponding to the first diode, the negative end of the first capacitor is connected with the synonym end of the primary coil of the current transformer corresponding to the first capacitor, and the anode of the second diode is connected with the negative output end of the voltage conversion circuit;

the anode of the first diode is a first input end of the full-wave rectification circuit, the anode of the second diode is a second input end of the full-wave rectification circuit, the connecting end of the cathode of the first diode and the cathode of the second diode is a first output end of the full-wave rectification circuit, and the negative end of the first capacitor is a second output end of the full-wave rectification circuit;

in the full-wave rectifying circuit of the second sub-equalizing circuit: the anode of the first diode is connected with the positive output end of the voltage conversion circuit, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load corresponding to the first diode, the negative end of the first capacitor is connected with the dotted terminal of the secondary coil of the (N-1) th current transformer in the (N-1) current transformers, and the anode of the second diode is connected with the negative output end of the voltage conversion circuit;

the anode of the first diode is a first input end of the full-wave rectification circuit, the anode of the second diode is a second input end of the full-wave rectification circuit, the connecting end of the cathode of the first diode and the cathode of the second diode is a first output end of the full-wave rectification circuit, and the negative end of the first capacitor is a second output end of the full-wave rectification circuit.

The present invention also provides a driving power supply including: the multi-path constant current driving circuit is described above.

The multi-path constant current driving circuit and the driving power supply have the following beneficial effects: the method comprises the following steps: the drive control unit, a plurality of equalizing circuits, a detection feedback circuit and a plurality of inductors, wherein the detection feedback circuit and the plurality of inductors are arranged corresponding to the equalizing circuits; the input end of the drive control unit is connected with an input signal, the output end of the drive control unit is respectively connected with the input ends of the plurality of equalizing circuits, the output ends of the plurality of equalizing circuits are respectively connected to the input ends of the plurality of loads, the detection end of each detection feedback circuit is connected with the corresponding equalizing circuit, and the output end of each detection feedback circuit is connected with the drive control unit; the inductors of two adjacent equalizing circuits are connected in series. The inductors in each equalizing circuit are equalized to realize multi-path equalizing output, and are regulated and controlled by the drive control unit to realize constant current drive; and the circuit has simple structure, reduces the cost of the power supply, and has good current balance and consistency and high reliability.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic block diagram of a multi-channel constant current driving circuit provided in an embodiment of the present invention;

fig. 2 is a circuit diagram of a first embodiment of the multi-path constant current driving circuit provided by the present invention;

fig. 3 is a circuit diagram of a second embodiment of the multi-path constant current driving circuit provided by the invention;

fig. 4 is a circuit diagram of a third embodiment of the multi-path constant current driving circuit provided by the invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic block diagram of a multi-channel constant current driving circuit provided by the present invention. The multi-path constant current driving circuit can realize multi-path constant current output, and can be applied to the field of LED illumination or other applications requiring controllable current or multi-path constant current.

Specifically, as shown in fig. 1, the multi-path constant current driving circuit includes: the drive control unit 11, a plurality of equalizing circuits 12, a detection feedback circuit 13 provided in correspondence with the plurality of equalizing circuits 12, and a plurality of inductors.

The input end of the driving control unit 11 is connected to an input signal, the output end of the driving control unit 11 is connected to the input ends of the balancing circuits 12, the output ends of the balancing circuits 12 are connected to the input ends of the loads, the detection end of each detection feedback circuit 13 is connected to the corresponding balancing circuit 12, and the output end of each detection feedback circuit 13 is connected to the driving control unit 11.

Each of the equalizing circuits 12 processes the voltage signal output from the drive control unit 11 and outputs the processed voltage signal to a load connected thereto; the inductor is used for performing equalization processing on the voltage signal output by the driving control unit 11 so as to enable the currents output by the equalization circuits 12 to be the same; each detection feedback circuit 13 detects the voltage and current output by the corresponding equalization circuit 12 and outputs a feedback control signal to the drive control unit 11; the drive control unit 11 adjusts the voltage signal according to the feedback control signal to realize constant current drive.

In some embodiments, the drive control unit 11 includes: a switch control circuit and a voltage conversion circuit. The inductor is a current transformer.

The input end of the switch control circuit is connected with an input signal, the output end of the switch control circuit is connected with the input end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected with the input end of the equalization circuit 12. The switch control circuit adjusts and controls the voltage conversion circuit according to the feedback control signal; the voltage conversion circuit performs conversion processing on the input signal according to the adjustment control of the switch control circuit, and outputs a voltage signal to the equalization circuit 12.

Further, in some embodiments, each detection feedback circuit 13 includes: a detection circuit and a feedback control circuit; the detection circuit is used for detecting the voltage and current output by the equalization circuit 12 and outputting a detection signal; the feedback control circuit is connected with the detection circuit, receives the detection signal and outputs a feedback control signal to the switch control circuit according to the detection signal.

It is understood that in other embodiments, each detection feedback circuit 13 may include only one feedback control circuit and a plurality of detection circuits, wherein the number of the plurality of detection circuits is the same as that of the equalization circuits 12, that is, one equalization circuit 12 is configured with one detection circuit, and a detection signal of each detection circuit is sent to the feedback control circuit, and the feedback control circuit outputs a corresponding feedback control signal to the switch control circuit according to the received detection signal.

By implementing the multi-path constant current driving circuit, the balance and consistency of current can be ensured by using the current transformer.

Optionally, in the embodiment of the present invention, the switch control circuit may adopt but is not limited to: any one of a full bridge circuit, a symmetrical half bridge circuit, an asymmetrical half bridge circuit, and a resonant half bridge circuit.

Optionally, in the embodiment of the present invention, the voltage conversion circuit may be implemented by a transformer.

Optionally, in the embodiment of the present invention, the detection circuit may include a current sampling circuit and a voltage sampling circuit. The detection signal comprises a current sampling signal and a voltage sampling signal. Specifically, the current sampling circuit is configured to collect an output current of the equalization circuit 12 corresponding thereto and output a current sampling signal. The voltage sampling circuit is used for collecting the output voltage of the equalizing circuit 12 correspondingly arranged with the voltage sampling circuit and outputting a voltage sampling signal.

Referring to fig. 2, fig. 2 is a circuit diagram of a first embodiment of the multi-path constant current driving circuit according to the present invention.

As shown in fig. 2, in this embodiment, 2N constant current outputs can be implemented. Wherein the plurality of loads include: n groups of loads, in N groups of loads, each group of loads comprises: two sub-loads; n is an integer of 1 or more.

Wherein the two sub-loads comprise a first sub-load and a second sub-load. As shown in fig. 2, in the first group of loads includes: load 1 and load 2, the second group of loads includes load 3 and load 4, and so on, the nth group of loads includes: load 2N-1 and load 2N. Therefore, the embodiment can realize 2-path, 4-path, 6-path, … … -path and 2N-path constant current output.

In this embodiment, the plurality of equalization circuits 12 includes: n first sub-equalization circuits and N second sub-equalization circuits;

the plurality of current transformers include: n-1 current transformers, and N-1 current transformers and N-1 first sub-equalization circuits are arranged correspondingly. Specifically, as shown in fig. 2, the multi-path constant current driving circuit is provided with N-1 current transformers, wherein the N-1 current transformers are arranged corresponding to the N-1 first sub-equalization circuits, and the nth second sub-equalization circuit does not need to be configured with a current transformer.

Specifically, each first sub-equalization circuit: the first DC blocking circuit, the first loop and the second loop. The second sub-equalization circuit includes: a second DC blocking circuit, a third loop and a fourth loop.

The input end of a first blocking circuit in each first sub-equalization circuit is connected with the positive output end of the voltage conversion circuit, the output end of the first blocking circuit is connected with the input end of a first loop, the output end of the first loop is connected with a corresponding first sub-load, and the return end of the first loop is connected with the synonym end of a primary coil of a corresponding current transformer; the input end of the second loop is connected with the synonym end of the primary coil of the corresponding current transformer, the output end of the second loop is connected with the corresponding second sub-load, and the return end of the second loop is connected with the output end of the first blocking circuit.

The input end of the second blocking circuit is connected with the output end of the voltage conversion circuit, the output end of the second blocking circuit is connected with the input end of a third loop, the output end of the third loop is connected with a corresponding first sub-load, and the return end of the third loop is connected with the homonymous end of the secondary coil of the (N-1) th current transformer in the (N-1) current transformers; the input end of the fourth loop is connected with the homonymous end of the secondary coil of the (N-1) th current transformer in the (N-1) current transformers, the output end of the fourth loop is connected with the corresponding second sub-load, and the return end of the fourth loop is connected with the output end of the second blocking circuit.

The dotted terminal of the secondary coil of the preceding current transformer in the two adjacent current transformers is connected with the dotted terminal of the primary coil of the subsequent current transformer, the dotted terminal of the primary coil of the first current transformer in the N-1 current transformers, and the dotted terminal of the secondary coil of each current transformer in the N-1 current transformers are connected with the negative output terminal of the voltage conversion circuit.

Specifically, as shown in fig. 2, the first dc blocking circuit and the second dc blocking circuit each include: a blocking capacitor; the first and third circuits each include: a first diode, a first capacitor and a third diode; the second circuit and the fourth circuit each include: a second diode, a second capacitor and a fourth diode. As shown in fig. 2, in the first sub-equalization circuit: c0-1 represents a blocking capacitor, D1-1 represents a first diode, D2-1 represents a second diode, D3-1 represents a third diode, D4-1 represents a fourth diode, C1-1 represents a first capacitor, and C2-1 represents a second capacitor; in a second first sub-equalization circuit: c0-2 represents a blocking capacitor, D1-2 represents a first diode, D2-2 represents a second diode, D3-2 represents a third diode, D4-2 represents a fourth diode, C1-2 represents a first capacitor, and C2-2 represents a second capacitor; … …, and so on, in the nth second sub-equalization circuit: C0-N represents a blocking capacitor, D1-N represents a first diode, D2-N represents a second diode, D3-N represents a third diode, D4-N represents a fourth diode, C1-N represents a first capacitor, and C2-N represents a second capacitor. L1 denotes a first current transformer, L2 denotes a second current transformer, … …, and so on, LN-1 denotes an N-1 th current transformer, wherein L1 is provided corresponding to a first sub-equalizing circuit, L2 is provided corresponding to a second first sub-equalizing circuit, … …, and so on, LN-1 is provided corresponding to an N-1 th first sub-equalizing circuit. The voltage conversion circuit includes a transformer T.

Specifically, in the first dc blocking circuit: the first end of the blocking capacitor is used as the input end of the first blocking circuit and connected with the positive output end of the voltage conversion circuit, the second end of the blocking capacitor is used as the output end of the second blocking circuit and connected with the anode of the first diode, the cathode of the first diode is connected with the first sub-load and the positive end of the first capacitor, the negative end of the first capacitor is connected with the anode of the third diode and the negative end of the second capacitor, and the cathode of the third diode is connected with the synonym end of the primary coil of the current transformer corresponding to the third diode.

The cathode of the second diode is connected with the second end of the blocking capacitor, the anode of the second diode is connected with the anode of the third diode and the negative end of the second capacitor, the positive end of the second capacitor is connected with the cathode of the fourth diode, the cathode of the fourth diode is connected with the second sub-load, and the anode of the fourth diode is connected with the synonym end of the current transformer corresponding to the fourth diode.

In the second dc blocking circuit: the first end of the blocking capacitor is used as the input end of the second blocking circuit and connected with the positive output end of the voltage conversion circuit, the second end of the blocking capacitor is used as the output end of the second blocking circuit and connected with the anode of the first diode, the cathode of the first diode is connected with the first sub-load and the positive end of the first capacitor, the negative end of the first capacitor is connected with the anode of the third diode and the negative end of the second capacitor, and the cathode of the third diode is connected with the dotted terminal of the secondary coil of the (N-1) th current transformer.

The cathode of the second diode is connected with the second end of the blocking capacitor, the anode of the second diode is connected with the anode of the third diode and the negative end of the second capacitor, the positive end of the second capacitor is connected with the cathode of the fourth diode, the cathode of the fourth diode is connected with the second sub-load, and the anode of the fourth diode is connected with the homonymous end of the secondary coil of the (N-1) th current transformer.

Specifically, as shown in fig. 2, in the first sub-equalization circuit: the first end of the C0-1, the first end of the C0-2, the first ends of the … … and the C0-N are all connected with the positive output end of the transformer T. The second end of the C0-1 is connected with the anode of the D1-1 and the cathode of the D2-1, the cathode of the D1-1 is connected with the positive end of the C1-1 and the input end of the load 1, the negative end of the C1-1 is connected with the anode of the D2-1, the anode of the D3-1 and the negative end of the C2-1, the cathode of the D3-1 and the anode of the D4-1 are connected with the synonym end of the primary coil of the L1, the cathode of the D4-1 is connected with the positive end of the C2-1, and the cathode of the D4-1 is also connected with the input end of the load 2.

Similarly, the connection relationship among the second first sub-equalization circuit, … …, and the connection relationship among the N-1 th first sub-equalization circuit are the same as those of the first sub-equalization circuit.

Further, as shown in fig. 2, the dotted terminal of the primary winding of L1 is connected to the negative output terminal of transformer T, the dotted terminal of the secondary winding of L1, the dotted terminal of the secondary winding of L2, the dotted terminals of … … and LN-1 are connected to the negative output terminal of transformer T, the dotted terminal of the secondary winding of L1 is connected to the dotted terminal of the primary winding of L2, the dotted terminal of the secondary winding of L2 is connected to the dotted terminal of the primary winding of L3, … …, and the dotted terminal of the secondary winding of LN-2 is connected to the dotted terminal of the primary winding of LN-1.

In an nth second sub-equalization circuit: the second end of C0-N is connected to the anode of D1-N and the cathode of D2-N, the cathode of D1-N is connected to the positive terminal of C1-N and the input terminal of load 2N-1, the negative terminal of C1-N is connected to the anode of D2-N, the anode of D3-N and the negative terminal of C2-N, the cathode of D3-N and the anode of D4-N are connected to the same name terminal of the secondary winding of LN-1, the cathode of D4-N is connected to the positive terminal of C2-N, and the cathode of D4-N is also connected to the input terminal of load 2N.

As shown in fig. 2, the dc blocking capacitor isolates the dc component in each loop, and ensures that the positive and negative currents are the same. The current transformer has the following functions: the current flowing in two adjacent current transformers has the same direction, and when the current i1 flows through L1, the current i2 flows through L2, and the induced electromotive force is generated by the current i2 and the induced electromotive force is generated by the current i1

i2 generating induced electromotive force

When L1 is L2, i1 is i2,

when i1<i2, coil L1 at a potential of

Potential at coil L2 is

The presence of Φ L1 and Φ L2 causes i1 to increase, i2 to become smaller, and ultimately, i2 — i 1.

Referring to fig. 3, fig. 3 is a circuit diagram of a second embodiment of the multi-path constant current driving circuit according to the present invention.

As shown in fig. 3, in this embodiment, 2-way, 3-way, 4-way, N-way constant current outputs. Wherein the plurality of loads include: n loads; n is an integer of 2 or more.

The plurality of equalization circuits 12 includes: n-1 first sub-equalization circuits and an Nth second sub-equalization circuit.

The plurality of current transformers include: n-1 current transformers, and N-1 current transformers and N-1 first sub-equalization circuits are arranged correspondingly. Specifically, as shown in fig. 3, the multi-path constant current driving circuit is provided with N-1 current transformers, wherein the N-1 current transformers are arranged corresponding to the N-1 first sub-equalization circuits, and the nth second sub-equalization circuit does not need to be configured with a current transformer.

Specifically, each of the first sub-equalization circuit and the nth second sub-equalization circuit includes: a full bridge rectifier circuit.

The first input end of the full-bridge rectifying circuit in each first sub-balancing circuit is connected with the dotted terminal of the secondary coil of the current transformer corresponding to the full-bridge rectifying circuit, the output end of the full-bridge rectifying circuit in each first sub-balancing circuit is connected with the load corresponding to the full-bridge rectifying circuit, and the second input end of the full-bridge rectifying circuit in each first sub-balancing circuit is connected with the negative output end of the voltage conversion circuit.

The first input end of the full-bridge rectifying circuit in the second sub-equalizing circuit is connected with the synonym end of the primary coil of the (N-1) th current transformer in the (N-1) current transformers, and the second input end of the full-bridge rectifying circuit in the second sub-equalizing circuit is connected with the negative output end of the voltage conversion circuit.

Specifically, as shown in fig. 3, the full-bridge rectifier circuit includes: the circuit comprises a first diode, a second diode, a third diode, a fourth diode and a first capacitor. As shown in fig. 3, in the first sub-equalization circuit: d1-1 represents a first diode, D2-1 represents a second diode, D3-1 represents a third diode, D4-1 represents a fourth diode, and C1-1 represents a first capacitor; in a second first sub-equalization circuit: d1-2 denotes a first diode, D2-2 denotes a second diode, D3-2 denotes a third diode, D4-2 denotes a fourth diode, and C2-1 denotes a first capacitor; … …, and so on, in the nth second sub-equalization circuit: D1-N denotes a first diode, D2-N denotes a second diode, D3-N denotes a third diode, D4-N denotes a fourth diode, and C1-N denotes a first capacitor. L1 denotes a first current transformer, L2 denotes a second current transformer, … …, and so on, LN-1 denotes an N-1 th current transformer, wherein L1 is provided corresponding to a first sub-equalizing circuit, L2 is provided corresponding to a second first sub-equalizing circuit, … …, and so on, LN-1 is provided corresponding to an N-1 th first sub-equalizing circuit. The voltage conversion circuit includes a transformer T.

Specifically, in a full-bridge rectification circuit of N-1 first sub-equalization circuits: the anode of the first diode is connected with the dotted terminal of the secondary coil of the current transformer, the cathode of the first diode is connected with the cathode of the second diode and the positive terminal of the first capacitor, and the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load correspondingly connected with the connecting end; the negative end of the first capacitor is connected with the anode of the fourth diode and the anode of the third diode, the cathode of the fourth diode is connected with the homonymous end of the secondary coil of the current transformer corresponding to the fourth diode, the cathode of the third diode is connected with the anode of the second diode, and the connecting end of the cathode of the third diode and the cathode of the second diode is further connected to the negative output end of the voltage conversion circuit.

The positive pole of first diode is the first input of full-bridge rectifier circuit, and the positive pole of second diode is the second input of full-bridge rectifier circuit, and the link of the negative pole of first diode and the negative pole of second diode is the output of full-bridge rectifier circuit.

In the full-bridge rectification circuit of the second sub-equalization circuit: the anode of the first diode is connected with the synonym end of the primary coil of the (N-1) th current transformer, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, and the connecting end of the cathode of the first diode and the cathode of the second diode is also connected with a load correspondingly connected with the connecting end; the negative end of the first capacitor is connected with the anode of the fourth diode and the anode of the third diode, the cathode of the fourth diode is connected with the synonym end of the primary coil of the (N-1) th current transformer, and the cathode of the third diode is connected with the anode of the second diode.

Specifically, as shown in fig. 3, in the first sub-equalization circuit: the anode of D1-1 and the cathode of D4-1 are connected with the same name end of the secondary coil of L1, the cathode of D1-1 is connected with the cathode of D2-1 and the positive end of C1-1 and is connected with the input end of a load 1, the negative end of C1-1 is connected with the anode of D4-1 and the anode of D3-1, and the cathode of D3-1 and the anode of D2-1 are connected with the negative output end of a transformer T.

Further, as shown in fig. 3, the dotted terminal of the primary winding of L1, the dotted terminal of the primary winding of L2, … …, and the dotted terminal of the primary winding of LN-1 are connected to the positive output terminal of the transformer T, the dotted terminal of the secondary winding of L1 is connected to the positive output terminal of the transformer T, the dotted terminal of the primary winding of L1 is connected to the dotted terminal of the secondary winding of L2, the dotted terminal of the primary winding of L2 is connected to the dotted terminal of the secondary winding of L3, and the dotted terminal of the primary winding of L … …, and the dotted terminal of the primary winding of LN-2 is connected to the dotted terminal of the secondary winding of LN-1.

In an nth second sub-equalization circuit: the anode of D1-N and the cathode of D4-N are connected with the synonym terminal of the primary coil of LN-1, the cathode of D1-N is connected with the positive terminal of C1-N and the input terminal of load N, the negative terminal of C1-N is connected with the anode of D3-N and the anode of D4-N, and the cathode of D4-N is connected with the synonym terminal of the primary coil of LN-1.

According to the embodiment, on the basis of the second embodiment, the blocking capacitor is saved, meanwhile, the first diode, the second diode, the third diode and the fourth diode are made into full-bridge rectification to supply power for only one load, the current transformer plays a role in balancing current of each path, and consistency and controllability of current of the 2-path, the 3-path, the 4-path, the … … -path and the N-path are achieved.

Referring to fig. 4, fig. 4 is a circuit diagram of a third embodiment of the multi-path constant current driving circuit according to the present invention.

As shown in fig. 4, in this embodiment, 2-way, 3-way, 4-way, and N-way constant current outputs are provided. Wherein the plurality of loads include: n loads; n is an integer of 2 or more.

The plurality of current transformers include: n-1 current transformers, and N-1 current transformers and N-1 first sub-equalization circuits are arranged correspondingly. Specifically, as shown in fig. 4, the multi-path constant current driving circuit is provided with N-1 current transformers, wherein the N-1 current transformers are arranged corresponding to the N-1 first sub-equalization circuits, and the nth second sub-equalization circuit does not need to be configured with a current transformer.

Specifically, each of the first sub-equalizing circuit and the nth second sub-equalizing circuit includes: a full-wave rectifying circuit.

The first input end of the full-wave rectifying circuit in the first sub-equalizing circuit and the second sub-equalizing circuit is connected with the positive output end of the voltage conversion circuit, the second input end of the full-wave rectifying circuit in the first sub-equalizing circuit and the second sub-equalizing circuit is connected with the negative output end of the voltage conversion circuit, and the first output end of the full-wave rectifying circuit in the first sub-equalizing circuit and the second sub-equalizing circuit is connected with a corresponding load.

And the second output end of the full-wave rectifying circuit in the second sub-equalizing circuit is connected with the synonym end of the secondary coil of the (N-1) th current transformer in the (N-1) current transformers.

The homonymous end of a primary coil of a first current transformer in the N-1 current transformers is connected with the sub-output end of the voltage conversion circuit, the synonym end of a secondary coil of the N-1 current transformers is connected with the sub-output end of the voltage conversion circuit, and the homonymous end of a secondary coil of a preceding current transformer of two adjacent current transformers is connected with the homonymous end of a primary coil of a subsequent current transformer.

Specifically, as shown in fig. 4, the full-wave rectifier circuit includes: the first diode, the second diode and the first capacitor. As shown in fig. 4, in the first sub-equalization circuit: d1-1 represents a first diode, D2-1 represents a second diode, and C1-1 represents a first capacitor; in a second first sub-equalization circuit: d1-2 represents a first diode, D2-2 represents a second diode, and C1-2 represents a first capacitor; … …, and so on, in the nth first sub-equalization circuit: D1-N represents a first diode, D2-N represents a second diode, and C1-N represents a first capacitor. L1 denotes a first current transformer, L2 denotes a second current transformer, … …, and so on, LN-1 denotes an N-1 th current transformer, wherein L1 is provided corresponding to a first sub-equalizing circuit, L2 is provided corresponding to a second first sub-equalizing circuit, … …, and so on, LN-1 is provided corresponding to an N-1 th first sub-equalizing circuit. The voltage conversion circuit includes a transformer T.

Specifically, in the full-wave rectifying circuit of the N-1 first sub-equalizing circuits: the anode of the first diode is connected with the positive output end of the voltage conversion circuit, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, the connecting end of the cathode of the first diode and the cathode of the second diode is further connected with the load corresponding to the first diode, the negative end of the first capacitor is connected with the synonym end of the primary coil of the current transformer corresponding to the first capacitor, and the anode of the second diode is connected with the negative output end of the voltage conversion circuit.

The positive pole of the first diode is the first input end of the full-wave rectification circuit, the positive pole of the second diode is the second input end of the full-wave rectification circuit, the connecting end of the negative pole of the first diode and the negative pole of the second diode is the first output end of the full-wave rectification circuit, and the negative end of the first capacitor is the second output end of the full-wave rectification circuit.

In the full-wave rectification circuit of the second sub-equalization circuit: the anode of the first diode is connected with the positive output end of the voltage conversion circuit, the cathode of the first diode is connected with the cathode of the second diode and the positive end of the first capacitor, the connecting end of the cathode of the first diode and the cathode of the second diode is further connected with a load corresponding to the first diode, the negative end of the first capacitor is connected with the homonymous end of the secondary coil of the (N-1) th current transformer in the (N-1) th current transformer, and the anode of the second diode is connected with the negative output end of the voltage conversion circuit.

Specifically, as shown in fig. 4, in the first sub-equalization circuit: the anode of D1-1 is connected with the positive output end of the transformer T, the cathode of D1-1 is connected with the cathode of D2-1, the positive end of C1-1 and the input end of the load 1, the negative end of C1-1 is connected with the synonym end of the primary coil of L1, and the anode of D2-1 is connected with the negative output end of the transformer T.

Further, as shown in fig. 4, the dotted terminal of the primary coil of L1 is connected to the sub-output terminal of the transformer, the dotted terminal of the secondary coil of L1, the dotted terminal of the secondary coil of L2, … …, and the dotted terminal of the secondary coil of LN-1 are connected to the sub-output terminal of the transformer, the dotted terminal of the secondary coil of L1 is connected to the dotted terminal of the primary coil of L2, the dotted terminal of the secondary coil of L2 is connected to the dotted terminal of the primary coil of L3, and … …, and the dotted terminal of the secondary coil of LN-2 is connected to the dotted terminal of the primary coil of LN-1.

In the embodiment, on the basis of the second embodiment, the transformer is changed into a center tap type, two diodes are used for full-wave rectification, and current balance and controllability of each path are realized according to the current transformer. The center tap (i.e., the sub-output end of the transformer T) may be a negative electrode or a positive electrode. Fig. 4 shows the anode, when the center tap is the cathode, the diode needs to be redirected.

Further, in the embodiments of fig. 2 to 4, the detection feedback circuit 13 includes: detection circuit 1, detection circuits 2, … …, detection circuit N and a feedback control circuit.

The invention also provides a driving power supply which comprises the multi-path constant current driving circuit disclosed by the embodiment of the invention.

Through setting up this multichannel constant current drive circuit, can provide drive power supply's conversion efficiency, the cost is still reduced simultaneously, owing to simplified circuit structure for drive power supply's volume and overall arrangement are littleer, have simplified the user and have installed the messenger, but also can promote drive power supply multi-channel control's current balance nature and the current uniformity of multichannel load.

Alternatively, the driving power source may include, but is not limited to, an LED driving power source, an industrial power supply driving device, and the like.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A multi-channel constant current driving circuit is characterized by comprising: the circuit comprises a drive control unit, a plurality of equalizing circuits, a detection feedback circuit and a plurality of inductors, wherein the detection feedback circuit is arranged corresponding to the equalizing circuits;

2. The multi-channel constant current driving circuit according to claim 1, wherein the driving control unit comprises: a switch control circuit and a voltage conversion circuit; the inductor is a current transformer;

3. The multi-channel constant current driving circuit according to claim 2, wherein each of the detection feedback circuits comprises: a detection circuit and a feedback control circuit;

4. The multi-path constant current driving circuit according to claim 2, wherein the plurality of loads comprise: n sets of loads, each set of loads of the N sets of loads comprising: two sub-loads; n is an integer greater than or equal to 1;

the two sub-loads comprise a first sub-load and a second sub-load;

5. The multi-channel constant current driving circuit according to claim 4, wherein the first blocking circuit and the second blocking circuit each include: a blocking capacitor; the first and third circuits each include: a first diode, a first capacitor and a third diode; the second loop and the fourth loop each include: a second diode, a second capacitor and a fourth diode;

6. The multi-path constant current driving circuit according to claim 2, wherein the plurality of loads comprise: n loads; n is an integer greater than or equal to 2;

7. The multi-channel constant current driving circuit according to claim 6, wherein the full-bridge rectifying circuit comprises: the first diode, the second diode, the third diode, the fourth diode and the first capacitor;

8. The multi-path constant current driving circuit according to claim 2, wherein the plurality of loads comprise: n loads; n is an integer greater than or equal to 2;

9. The multi-channel constant current driving circuit according to claim 8, wherein the full-wave rectifying circuit comprises: the first diode, the second diode and the first capacitor;

10. A drive power supply, comprising: the multi-channel constant current driving circuit as claimed in any one of claims 1 to 9.