Concentrated direct current power supply device and power supply method thereof

Abstract

The invention discloses a centralized direct-current power supply device and a power supply method thereof. The power supply device comprises a direct current power module, a main monitoring unit and a current sharing unit. The direct-current power module comprises an input end and a plurality of output ends, the input end receives electric energy input, and the output ends output direct current outwards. The main monitoring unit is used for obtaining the output current or the output voltage of the direct current power module and outputting a reference signal. The current sharing unit comprises a plurality of input ends and a plurality of output ends, the input ends of the current sharing unit are electrically connected with the output ends of the DC power modules, and the output ends of the current sharing unit are used for being electrically connected with loads. The current sharing unit comprises a plurality of control units and a plurality of current regulators controlled by the corresponding control units. When the output end of the current sharing unit is connected with a load, a load loop is formed, each load loop comprises a control unit, a load and a current regulator, and the control unit obtains a reference signal and outputs a first control signal to the corresponding current regulator according to the reference signal and the loop current of the corresponding load loop so as to adjust the corresponding loop current.

Description

Technical Field

[0001] The invention relates to an electric power technology, and in particular to a centralized direct current power supply device and a power supply method thereof. Background Art

[0002] As high-power LED lamps begin to replace traditional sodium lamp lighting in places such as stadiums, marine fishing, and chemical curing, the way they are powered has also changed.

[0003] Currently, the industry mostly uses separate power supplies, such as Figure 1 As shown, one lamp is equipped with one power supply. Taking LED lamps as an example, one LED lamp is equipped with one LED driver power supply. However, this power supply method has high power and maintenance costs, and the volume and space occupied are also large.

[0004] In order to solve these problems in the above applications, engineers in the industry have begun to propose the use of high-power DC centralized power supply, such as Figure 2 As shown, the power supply of the original lamp parts is concentrated together to form a high-power centralized DC power supply cabinet, which may include a DC power module and a monitoring unit. For this type of DC centralized power supply, the power supply required by all lamps is drawn from the centralized DC power supply cabinet, and the lamp part no longer needs to be installed with a separate power supply device. Since the lamp uses an LED light source, it is a light source that is very sensitive to voltage changes. When the lamp uses a DC centralized power supply, the lamps in the same circuit are generally connected to a high-power DC power module. In addition, this application must require that the working voltage and wiring length of the lamps are basically the same to ensure that the working current of each lamp is basically the same. However, due to the discreteness of the wiring length and the working voltage of the lamp in actual applications, when using Figure 2 When the DC centralized power supply is shown, the current of the lamps in the same circuit will be dispersed, resulting in large current in some circuits and small current in some circuits. In serious cases, it may cause damage to the lamps.

[0005] Therefore, in view of the above situation, it is necessary to propose a method that can solve the uneven current of DC centralized power supply to solve the problems arising in the current application process. Summary of the invention

[0006] An object of the present invention is to provide a centralized DC power supply device and a power supply method thereof, which can effectively solve at least one defect of the prior art.

[0007] In order to achieve the above-mentioned object, the present invention provides a centralized DC power supply device, comprising: a DC power module, comprising an input end and multiple output ends, the input end of the DC power module accepts electric energy input, and the output end of the DC power module outputs DC power to the outside; a total monitoring unit, used to obtain the output current or output voltage of the DC power module and output a reference signal; a current balancing unit, comprising multiple input ends and multiple output ends, the multiple input ends of the current balancing unit are electrically connected to the multiple output ends of the DC power module, and the multiple output ends of the current balancing unit are used to electrically connect to loads; the current balancing unit includes multiple control units and multiple current regulators, wherein the current regulators are controlled by the corresponding control units; when the multiple output ends of the current balancing unit are connected to multiple loads, multiple load loops can be formed, each of the load loops includes the control unit and the load and the current regulator connected in series; the control unit of each load loop obtains and outputs a first control signal to the current regulator of the corresponding load loop according to the reference signal and the loop current of the corresponding load loop, so as to adjust the loop current of the corresponding load loop.

[0008] In some embodiments of the present invention, the reference signal includes an output current of the DC power module divided by the number of the load loops.

[0009] In some embodiments of the present invention, the load includes an LED lamp.

[0010] In some embodiments of the present invention, the current regulator includes a power tube, and the conduction degree of the power tube is controlled by the first control signal.

[0011] In some embodiments of the present invention, the centralized DC power supply device further includes a current threshold; the total monitoring unit obtains the loop current of each of the load loops, and outputs a second control signal based on the current threshold and the loop current of each of the load loops, and the second control signal is used to control the output power of the DC power module.

[0012] In some embodiments of the present invention, the centralized DC power supply device further includes a voltage threshold; the total monitoring unit obtains the voltage value of the current regulator of each load circuit, and outputs a third control signal based on the voltage threshold and the voltage value of the current regulator of each load circuit, and the third control signal is used to control the output power of the DC power module.

[0013] In some embodiments of the present invention, the current balancing unit also includes a sub-monitoring unit, which includes a communication unit and a processing unit; the communication unit is used to realize a communication connection between the sub-monitoring unit and the main monitoring unit; the processing unit obtains the reference signal output by the main monitoring unit through the communication unit, and transmits the reference signal to the control unit of each load circuit.

[0014] In some embodiments of the present invention, the processing unit further obtains the loop current of each of the load loops and transmits it to the overall monitoring unit through the communication unit.

[0015] In some embodiments of the present invention, the processing unit further obtains a voltage value of the current regulator of each of the load circuits, and transmits the voltage value to the overall monitoring unit via the communication unit.

[0016] In some embodiments of the present invention, the centralized DC power supply device includes a plurality of the DC power modules and a plurality of the current balancing units, wherein the DC power modules correspond to the current balancing units one by one.

[0017] In order to achieve the above object, the present invention also provides a power supply method using the above centralized DC power supply device, comprising the following steps:

[0018] The main monitoring unit obtains the output current or output voltage of the DC power module and outputs a reference signal;

[0019] The control unit of each load loop obtains and outputs a first control signal to the current regulator corresponding to the load loop according to the reference signal and the loop current corresponding to the load loop.

[0020] In some embodiments of the present invention, a current threshold is provided in the centralized DC power supply device, and the steps further include:

[0021] The main monitoring unit obtains the loop current and the current threshold of each load loop;

[0022] The general monitoring unit compares the loop current of each load loop with the current threshold, and outputs a second control signal to the DC power module;

[0023] When the loop current is less than the current threshold, the second control signal controls the output power of the DC power module to increase;

[0024] When the loop current is greater than the current threshold, the second control signal controls the output power of the DC power module to be reduced;

[0025] When the loop current is equal to the current threshold, return to the step: the total monitoring unit obtains the output current or output voltage of the DC power module and outputs a reference signal.

[0026] In some embodiments of the present invention, a voltage threshold is provided in the centralized DC power supply device, and the steps further include:

[0027] The overall monitoring unit acquires the voltage value and the voltage threshold of the current regulator of each load circuit;

[0028] The overall monitoring unit compares the voltage value of the current regulator of each load loop with the voltage threshold;

[0029] When the voltage value of the current regulator of each load circuit is less than or equal to the voltage threshold, returning to the step: the overall monitoring unit acquires the voltage value of the current regulator of each load circuit and the voltage threshold;

[0030] When the voltage value of the current regulator of each of the load loops is greater than the voltage threshold, the total monitoring unit outputs a third control signal to the DC power module, the third control signal controls the reduction of the output power of the DC power module, and returns to the step: the total monitoring unit obtains the voltage value of the current regulator of each of the load loops and the voltage threshold;

[0031] The priority of the third control signal is higher than the priority of the second control signal.

[0032] In some embodiments of the present invention, the current balancing unit includes a sub-monitoring unit, the sub-monitoring unit is communicatively connected to the main monitoring unit, and a voltage threshold is set in the sub-monitoring unit. The steps further include:

[0033] The sub-monitoring unit acquires the voltage value and the voltage threshold of the current regulator of each load loop;

[0034] The sub-monitoring unit compares the voltage value of the current regulator of each of the load loops with the voltage threshold;

[0035] When the voltage value of the current regulator of each load loop is less than or equal to the voltage threshold, returning to the step: the sub-monitoring unit acquires the voltage value of the current regulator of each load loop and the voltage threshold;

[0036] When the voltage value of the current regulator of each of the load loops is greater than the voltage threshold, the sub-monitoring unit sends a request signal to the main monitoring unit;

[0037] The main monitoring unit obtains and outputs a third control signal to the DC power module according to the request signal, wherein the third control signal controls the reduction of the output power of the DC power module, and returns to the step: the sub-monitoring unit obtains the voltage value and the voltage threshold of the current regulator of each load circuit;

[0038] The priority of the third control signal is higher than the priority of the second control signal.

[0039] The present invention can solve the problem of uneven current distribution of lamps caused by the original DC centralized power supply mode and avoid the problem of lamp damage caused thereby. The present invention can also expand the application scenarios of the DC centralized power supply mode, reduce the matching difficulty of lamp loads and the requirements for on-site wiring construction, and has high practical value.

[0040] Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0042] Figure 1 It is a structural schematic diagram of the separate power supply mode of the prior art;

[0043] Figure 2 It is a structural schematic diagram of a DC centralized power supply method in the prior art;

[0044] Figure 3 It is a structural schematic diagram of a centralized DC power supply device of the present invention;

[0045] Figure 4 The structure diagram of a preferred centralized DC power supply device of the present invention is shown, wherein a plurality of DC power modules correspond one to one with a plurality of current balancing units;

[0046] Figure 5 Shows Figure 4 A structural schematic diagram of a preferred embodiment of a current balancing unit;

[0047] Figure 6 It is a schematic flow chart of a power supply method of a centralized DC power supply device of the present invention;

[0048] Figure 7 It is a flow chart of the power supply method of the present invention when a current threshold is provided in the centralized DC power supply device (for example, provided in the main monitoring unit);

[0049] Figure 8It is a flow chart of the power supply method of the present invention when a voltage threshold is provided in a centralized DC power supply device (for example, provided in a main monitoring unit);

[0050] Fig. 9 It is a flow chart of the power supply method of the present invention when a voltage threshold is set in the sub-monitoring unit. DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0052] When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", "the", "said", and "at least one" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including", and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The term "connected" is used to indicate a direct connection between two elements / components, or an indirect connection (i.e., there are other elements / components between the two elements / components). In addition, the terms "first", "second", etc. in the claims are used only as markers and are not numerical limitations on their objects.

[0053] like Figure 3 As shown, a centralized DC power supply device 100 provided by the present invention can be integrated into a centralized DC power supply cabinet, and can include a DC power module 10, a total monitoring unit 20, and a current balancing unit 30. The DC power module 10 can include an input end and multiple output ends. The input end of the DC power module 10 can accept electric energy input, such as electric energy from a power grid 200, and the output end of the DC power module 10 can output DC power to the outside. The total monitoring unit 20 can be used to obtain the output current (e.g., I out1 ) or output voltage (such as V out1 ) and output a reference signal (such as R ref The current balancing unit 30 may include multiple input terminals and multiple output terminals. The multiple input terminals of the current balancing unit 30 may be electrically connected to the multiple output terminals of the DC power module 10, and the multiple output terminals of the current balancing unit 20 may be electrically connected to the load 300. Figure 3In the illustrated embodiment, the current balancing unit 30 is, for example, electrically connected to N loads 300 (where N is a positive integer greater than or equal to 1), namely, load 1, ..., load N, but it is understandable that the number of loads 300 in the present invention is not limited thereto.

[0054] In the present invention, the current balancing unit 30 may include a plurality of control units 31 (see Figure 5 ) and multiple current regulators 32 (see Figure 5 ), and the current regulator 32 is controlled by the corresponding control unit 31. When multiple output terminals of the current balancing unit 30 are connected to multiple loads 300, multiple load loops can be formed, for example Figure 3 As shown in FIG. 1 , N load loops are formed by N loads 300 (for example, including load 1, ..., load N), and the N load loops have loop currents I1, ..., I N In the present invention, each load circuit may include the control unit 31 and the load 300 and the current regulator 32 connected in series. Furthermore, the control unit 31 of each load circuit may obtain and control the load 300 according to a reference signal (e.g. Figure 3 R ref or Figure 5 I ref ) and the corresponding load circuit current (e.g. Figure 3 I1, ..., I N or Figure 5 I 功率管 ) outputs a first control signal (eg, Figure 5 C1 in the load circuit) is used to adjust the loop current corresponding to the load circuit. For example, when the reference signal is a current value, when the control unit in a load circuit determines that the current value of the load circuit is less than the current value contained in the reference signal, a first control signal C1 will be sent to the current regulator 32 to increase the conduction degree of the current regulator 32, so that the current value in the load circuit rises to the current value contained in the reference signal; conversely, when the control unit determines that the current value in the load circuit is greater than the current value contained in the reference signal, a first control signal C1 will be sent to the current regulator 32 to reduce the conduction degree of the current regulator 32, so that the current value in the load circuit is reduced to the current value contained in the reference signal. Since the control units in each load circuit connected to the same current balancing unit receive the same reference signal, the current magnitude of each load circuit connected to the same current balancing unit can be the same, and the effect of current balancing is finally achieved.

[0055] In some embodiments, the reference signal (eg, R ref ) may include the output current of the DC power module 10 (e.g., I out1) divided by the number of load loops. When the reference signal is set in this way, the total output current of the DC power module 10 will be evenly distributed to each load loop connected to the DC power module 10.

[0056] In some embodiments, the load 300 may include but is not limited to an LED lamp (eg Figure 4 The current regulator 32 may include a power tube (eg Figure 5 As shown), the conduction degree of the power tube can be affected by the first control signal (for example Figure 5 C1) control in.

[0057] In some embodiments, to ensure that each load operates in a better state, a current threshold is set in the centralized DC power supply device. For example, the current threshold can be preset in the main monitoring unit 20. The magnitude of the current threshold can be the rated current value of the load, but is not limited thereto. The main monitoring unit 20 can obtain the loop current of each load loop (for example Figure 3 I1, ..., I N or Figure 5 The working current of the medium power tube I 功率管 ), and outputs a second control signal C2 according to the current threshold and the loop current of each load loop, so as to control the output power of the DC power module 10.

[0058] In some embodiments, since the current regulator 32 itself has a certain voltage resistance range, a voltage threshold is set in the centralized DC power supply device. For example, the voltage threshold can be preset in the main monitoring unit 20, and the main monitoring unit 20 can obtain the voltage value of the current regulator 32 of each load circuit (for example Figure 5 The working voltage of the medium power tube is V 功率管 ), and outputs a third control signal C3 according to the voltage threshold and the voltage value of the current regulator 32 of each load circuit, for controlling the output power of the DC power module 10. Since the normal use of the current regulator 32 needs to be guaranteed first, the priority of the third control signal C3 is higher than that of the second control signal C2.

[0059] like Figure 4 As shown, it shows the structure of a preferred centralized DC power supply device 100 of the present invention. In this preferred embodiment, the centralized DC power supply device 100 may preferably include a plurality of DC power modules 10 (for example, including P DC power modules, namely, DC power module 1, ..., DC power module P, where P is a positive integer greater than or equal to 1) and a plurality of current balancing units 30 (for example, including P current balancing units, namely, current balancing unit 1, ..., current balancing unit P), and the plurality of DC power modules 10 and the plurality of current balancing units 30 are in one-to-one correspondence.

[0060] In this embodiment, the DC power modules 1, . . . , and the DC power module P may respectively have an output current I out1-1 Or output voltage V out1-1 , ..., output current I out1-P Or output voltage V out1-P The input end of the current balancing unit 1 can be electrically connected to an output end of the DC power module 1, and the M output ends of the current balancing unit 1 can be electrically connected to M LED lamps (i.e., so-called "loads", such as LED lamps 1, ..., LED lamps M, where M is a positive integer greater than or equal to 1), and can form M LED lamp loops (i.e., so-called "load loops"), wherein the LED lamp loops corresponding to the LED lamps 1, ..., LED lamps M respectively have loop currents I 1-1 ,……,I 1-M The connection relationship between other current balancing units and other DC power modules is similar to the connection relationship between current balancing unit 1 and DC power module 1, and will not be repeated here. For example, the M output ends of the current balancing unit P can also be electrically connected to M LED lamps (i.e., LED lamp 1, ..., LED lamp M) and form M LED lamp loops, which can have loop currents I P-1 ,……,I P-M In this preferred embodiment, the number of LED lamp circuits (i.e., load circuits) formed by the current balancing units 1, ..., and the current balancing unit P is the same, i.e., M. However, it can be understood that the number of LED lamp circuits (i.e., load circuits) formed by the current balancing units 1, ..., and the current balancing unit P can also be completely or partially different, and these are not intended to limit the present invention. In other words, each current balancing unit in the present invention can allocate the number of circuits according to the actual load.

[0061] like Figure 5 As shown, it shows Figure 4 A preferred embodiment of the current balancing unit 30 is structured as follows: Figure 4 Take the current balancing unit 1 in the figure as an example. Figure 5 In the example, the current regulator 32 in the current balancing unit 30 is a power tube, and the first output end of the power tube is electrically connected to the LED lamp 1 and further electrically connected to the output positive pole (i.e., the DC positive pole) of the corresponding DC power module through the LED lamp 1, and the second output end of the power tube is electrically connected to the output negative pole (i.e., the DC negative pole) of the corresponding DC power module, thereby forming an LED lamp loop. In addition, the control end of the power tube is connected to the control unit 31 in the current balancing unit 30, so that the conduction degree of the power tube can be controlled by the first control signal C1 from the control unit 31. Figure 5In the embodiment, the LED lamp 1 and the current balancing unit 30 are electrically connected in series. In addition, in order to simplify the drawings, Figure 5 Only the LED lamp circuit formed by LED lamp 1 is shown in FIG. 1 , and other LED lamp circuits formed by other LED lamps are shown in FIG. Figure 5 The other LED lamp circuits formed by other LED lamps are omitted in the figure, and the LED lamp circuit formed by the LED lamp 1 is electrically connected in parallel.

[0062] Preferably, the current balancing unit 30 may further include a sub-monitoring unit 33. The sub-monitoring unit 33 may include a communication unit 331 and a processing unit 332. The communication unit 331 may be used to realize the communication connection between the sub-monitoring unit 33 and the main monitoring unit 20. The processing unit 332 may obtain the reference signal (such as the reference signal output by the main monitoring unit 20) output by the communication unit 331. Figure 5 The reference current I in the embodiment shown ref ), and transmit the reference signal to each load loop (such as Figure 5 In the embodiment shown, the control unit 31 of the LED lamp circuit formed by the LED lamp 1 is Figure 5 In the embodiment, the processing unit 332 may be, for example, a microprocessor (MCU), but the invention is not limited thereto.

[0063] Preferably, the processing unit 332 can also obtain the loop current of each load loop and transmit it to the main monitoring unit 20 through the communication unit 331. Figure 5 In the embodiment shown, a current sampling resistor 35 can be coupled between the second output terminal of the power tube and the DC negative pole, and a current detection unit 36 ​​is used to detect the working current I on the power tube through a node N1 between the second output terminal of the power tube and one end of the current sampling resistor. 功率管 The current detection unit 36 ​​can detect the working current I 功率管 The second control signal C2 is transmitted to the processing unit 332 and the control unit 31, and then transmitted to the main monitoring unit 20 through the processing unit 332 and the communication unit 331. The main monitoring unit 20 further sends a second control signal C2 to the DC power module 10 according to the acquired current threshold.

[0064] Preferably, the processing unit 332 can also obtain the voltage value of the current regulator 32 of each load loop (for example Figure 5 The working voltage of the power tube in V 功率管), and transmits it to the main monitoring unit 20 through the communication unit 331. The main monitoring unit 20 further sends a third control signal C3 to the DC power module 10 according to the obtained voltage threshold. Figure 5 In the embodiment shown, a voltage detection unit 34 can be used to detect the working voltage V on the power tube through the node N2 between the first output terminal of the power tube and the LED lamp 1. 功率管 The voltage detection unit 34 can detect the working voltage V 功率管 The voltage threshold value may also be directly preset in the sub-monitoring unit 33, such as being set in the processing unit 332. In this case, the processing unit 332 obtains the voltage value of the current regulator 32 of each load circuit (for example, Figure 5 The working voltage of the power tube in V 功率管 ), there is no need to transmit it to the main monitoring unit 20 through the communication unit 331. The processing unit 332 can directly obtain the voltage threshold and compare the voltage value of the current regulator 32 with the voltage threshold. When the voltage value of the current regulator 32 is less than or equal to the voltage threshold, no signal is sent to the main monitoring unit, and the voltage value of the current regulator 32 is remeasured. When the voltage value of the current regulator 32 is greater than the voltage threshold, the sub-monitoring unit 33 will send a request signal to the main monitoring unit 20, and the main monitoring unit 20 will send a third control signal C3 according to the request signal. The third control signal C3 is used to reduce the output power of the DC power module 10, for example, reduce the output voltage of the DC power module 10.

[0065] For the LED lamp loop formed by the LED lamp 1, the processing unit 332 may receive the reference signal output by the main monitoring unit 20, such as Figure 5 The reference current I ref (It can be, for example, Figure 4 The output current I of the DC power module 1 corresponding to the current balancing unit 1 out1-1 The current equalization unit 1 is divided by the number of load loops M formed by connecting the current equalization unit 1, and the current equalization unit 1 is given to the control unit 31 as a reference for current control. The control unit 31 further obtains the working current I 功率管 , and the reference current I sent by the processing unit 332 ref Compare and output control current I con(i.e. the so-called "first control signal C1") is sent to the control end of the power tube to control the operation of the power tube, thereby forming a negative feedback system, and further enabling the power tube in the current balancing unit 30 to operate in a constant current state. In the present invention, since each lamp circuit connected to the LED lamp has a similar current balancing unit, the function of averaging the current of all lamp circuits connected to the LED lamps in the centralized DC power supply cabinet can be achieved. In other words, the present invention can process the loop current of each LED lamp circuit through the current balancing unit 30, and adjust the loop currents of multiple LED lamp circuits connected to the same DC power module to make their currents equal, thereby achieving the effect of current average distribution.

[0066] In some other embodiments, the main monitoring unit 20 of the present invention can also collect data (including current data and / or voltage data) of each current balancing unit 30 and each DC power module 10, and control the operation of each DC power module 10, such as controlling the output power of the corresponding DC power module 10.

[0067] More specifically, if Figure 4 As shown, the main monitoring unit 20 can be based on the output current I of the DC power module 1 out1-1 Or output voltage V out1-1 The loop current of each load loop (for example, including the loop current I 1-1 ,……,I 1-M ) outputs a second control signal C2 to the corresponding DC power module 1, which is used to control the output power of the corresponding DC power module 1, so as to ensure that each load loop current is balanced, so that each load can work in the best state. For example, when the current of each load loop does not reach the rated size, the output power of the DC power module 1 can be increased to make each load work in the rated state. For example, when the current of each load loop exceeds the rated size, the output power of the DC power module 1 can be reduced to make each load work in the rated state.

[0068] like Figure 4 and Figure 5 As shown, since the current regulator 32 itself needs to work within a certain voltage range, exceeding the voltage range will cause the current conditioner 32 to not work properly. Therefore, in order to make the current regulator 32 work stably, when generating the reference signal, the voltage of each load loop must also be considered. Therefore, the main monitoring unit 20 obtains the voltage value of the current regulator 32 of the LED lamp loop formed by the LED lamp 1 (for example, the working voltage V 功率管 ), and according to the voltage threshold preset in the centralized DC power supply device and the voltage value of the current regulator 32 of the LED lamp circuit formed by the LED lamp 1 (for example, the working voltage V 功率管) outputs a third control signal C3 to the corresponding DC power module 1, for controlling the output power of the corresponding DC power module 1, wherein the priority of the third control signal C3 is higher than the priority of the second control signal C2.

[0069] More specifically, if Figure 4 As shown, the overall monitoring unit 20 can, for example, be configured to monitor the output current I of the corresponding DC power module 1. out1-1 Or output voltage V out1-1 Output corresponding reference signal R ref-1 Sent to the corresponding current balancing unit 1, where the reference signal R ref-1 For example, the output current I of the corresponding DC power module 1 may be out1-1 Divided by the number of load loops formed by the corresponding connection M. Similarly, the overall monitoring unit 20 can, for example, monitor the output current I of the corresponding DC power module P according to the output current I out1-P Or output voltage V out1-P Output corresponding reference signal R ref-P Sent to the corresponding current balancing unit P, where the reference signal R ref-P For example, it can be the output current I of the corresponding DC power module P out1-P divided by the number of load loops formed by the corresponding connection M. The corresponding current balancing units 1-P can be based on the corresponding reference signal R ref-1 ~R ref-P and the corresponding load circuit loop current (for example, including the loop current I 1-1 ~I 1-M ,I P-1 ~I P-M ) outputs a first control signal C1 (such as Figure 5 As shown), it is used to adjust the loop current of the corresponding load loop.

[0070] like Figure 6 As shown, it shows the power supply method of the present invention using the centralized DC power supply device as described above, and the preferred implementation sequence is as follows, but the implementation sequence is not limited to this, including the following steps:

[0071] S1: The main monitoring unit obtains the output current or output voltage of the DC power module and outputs a reference signal;

[0072] S2: The control unit of each load circuit obtains and outputs a first control signal to the current regulator of the corresponding load circuit according to the reference signal and the circuit current of the corresponding load circuit.

[0073] In order to enable each load to work at a rated state, in some embodiments, a current threshold is set in the centralized DC power supply device, for example, it can be preset in the main monitoring unit, but it is not limited to this. The magnitude of the current threshold can be the rated current value of the load, but it is not limited to this. Figure 7 As shown, the power supply method of the present invention may also include:

[0074] S3: The main monitoring unit obtains the loop current and current threshold of each load loop;

[0075] S4: the main monitoring unit compares the loop current of each load loop with the current threshold, and outputs a second control signal to the DC power module;

[0076] When the loop current is less than the current threshold, the second control signal controls the output power of the DC power module to increase;

[0077] When the loop current is greater than the current threshold, the second control signal controls the output power of the DC power module to be reduced;

[0078] When the loop current is equal to the current threshold, return to step S1.

[0079] Through the above steps, each load can work in the best state on the basis of ensuring the current equalization of each load loop. For example, when the current size of each load loop does not reach the rated size, each load can work in the rated state by increasing the output power of the DC power module 10. When the current size of each load loop exceeds the rated size, each load can work in the rated state by reducing the output power of the DC power module 10.

[0080] Since the current regulator 32 itself needs to work within a certain voltage range, exceeding this voltage range will cause the current conditioner 32 to not work properly. Therefore, in order to make the current regulator 32 work stably, the voltage of each load circuit must be considered when generating the reference signal. To this end, in some embodiments, a voltage threshold is provided in the centralized DC power supply device, for example, the voltage threshold is preset in the main monitoring unit, and the size of the voltage threshold can be set to the upper limit voltage when the current regulator works normally, for example, it can be the upper limit voltage value of the power tube. Figure 8 As shown, the power supply method of the present invention may also include:

[0081] S5: The main monitoring unit obtains the voltage value and voltage threshold of the current regulator of each load circuit;

[0082] S6: The main monitoring unit compares the voltage value of the current regulator of each load loop with the voltage threshold;

[0083] When the voltage value of the current regulator of each load loop is less than or equal to the voltage threshold, return to step S5;

[0084] When the voltage value of the current regulator of each load loop is greater than the voltage threshold, the main monitoring unit outputs a third control signal to the DC power module, the third control signal controls to reduce the output power of the DC power module, and returns to step S5;

[0085] The priority of the third control signal is higher than the priority of the second control signal.

[0086] In some embodiments, the current balancing unit may include a sub-monitoring unit, which is communicatively connected to the main monitoring unit, and the voltage threshold may be set in each sub-monitoring unit in the current balancing unit. Fig. 9 As shown, in the power supply method of the present invention, the above two steps S5 and S6 can be replaced by the following steps R1 to R3:

[0087] R1: The sub-monitoring unit obtains the voltage value and voltage threshold of the current regulator of each load circuit;

[0088] R2: The sub-monitoring unit compares the voltage value of the current regulator of each load loop with the voltage threshold;

[0089] When the voltage value of the current regulator of each load loop is less than or equal to the voltage threshold, return to step R1;

[0090] When the voltage value of the current regulator of each load circuit is greater than the voltage threshold, the sub-monitoring unit sends a request signal to the main monitoring unit;

[0091] R3: The main monitoring unit obtains and outputs a third control signal to the DC power module according to the request signal, the third control signal controls to reduce the output power of the DC power module, and returns to step R1;

[0092] The priority of the third control signal is higher than the priority of the second control signal.

[0093] By setting a sub-monitoring unit in each current balancing unit and setting the voltage threshold in the sub-monitoring unit, a request signal will be sent to the main monitoring unit only when the voltage value of the current regulator is greater than the voltage threshold, and the main monitoring unit will take action at this time, which greatly reduces the calculation pressure of the main monitoring unit. At the same time, the sub-monitoring unit is closer to the load circuit and can give priority to processing some fault signals, such as responding faster to the voltage of the current regulator, which is beneficial to protecting the current regulator.

[0094] When the load is an LED lamp, its operating voltage will be affected by temperature. When the operating temperature rises, the conduction voltage of the LED lamp will decrease, and vice versa. Figure 2 In the existing centralized DC power supply method shown in the figure, the operating voltage change of the LED lamp will cause the current output of the centralized DC power supply system to be unstable, and a more complex strategy is needed to deal with the current fluctuation caused by temperature changes. Figure 3 The architecture of the centralized DC power supply device of the present invention shown in the figure has the function of outputting constant current by the current balancing unit itself, so the current output by the loop is no longer affected by the change of the working temperature of the lamp. When the temperature rises, the working voltage of the LED lamp will decrease, and the reduced voltage will be added to the power tube. As long as it is within the range that the power tube can tolerate, the total monitoring unit will not do any processing. If the voltage data of the current balancing unit obtained by the total monitoring unit is too high, it needs to reduce the output power of the corresponding DC power module so that the corresponding load circuit can continue to work stably. When the temperature drops, the working voltage of the LED lamp will increase, which may cause the loop current of the corresponding load circuit to decrease (when there is no current balancing unit, the current will inevitably decrease), and the tolerance voltage of the power tube in the corresponding current balancing unit will also decrease. When the total monitoring unit detects that the total loop current of the centralized power supply system has decreased, within the range that the power tube can tolerate, the total monitoring unit can fine-tune the output power of the DC power module to ensure the stability of the working current of the LED lamp.

[0095] In addition, when the load is an LED lamp, the LED lamp can be installed at a high or remote place, and the current balancing unit, DC power module and total monitoring unit can be integrated in the same cabinet, which can greatly reduce the difficulty of overall maintenance.

[0096] The present invention can solve the problem of uneven current distribution of lamps caused by the original DC centralized power supply mode and avoid the problem of lamp damage caused thereby. The present invention can also expand the application scenarios of the DC centralized power supply mode, reduce the matching difficulty of lamp loads and the requirements for on-site wiring construction, and has high practical value.

[0097] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the disclosed embodiments, but rather is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A centralized DC power supply device, characterized in that: include: A DC power module, comprising an input end and a plurality of output ends, wherein the input end of the DC power module receives electric energy input, and the output end of the DC power module outputs DC power externally; A total monitoring unit, used for obtaining the output current or output voltage of the DC power module and outputting a reference signal; A current balancing unit, comprising a plurality of input terminals and a plurality of output terminals, wherein the plurality of input terminals of the current balancing unit are electrically connected to the plurality of output terminals of the DC power module, and the plurality of output terminals of the current balancing unit are used to electrically connect to a load; the current balancing unit comprises a plurality of control units and a plurality of current regulators, wherein the current regulators are controlled by the corresponding control units; When the multiple output ends of the current balancing unit are connected to multiple loads, multiple load loops can be formed, each of which includes the control unit and the load and the current regulator connected in series; the control unit of each load loop obtains and outputs a first control signal to the current regulator corresponding to the load loop based on the reference signal and the loop current of the corresponding load loop, so as to adjust the loop current of the corresponding load loop.

2. The centralized DC power supply device according to claim 1, characterized in that: The reference signal includes the output current of the DC power module divided by the number of the load loops.

3. The centralized DC power supply device according to claim 1, characterized in that: The load includes an LED lamp.

4. The centralized DC power supply device according to claim 1, characterized in that: The current regulator includes a power tube, and the conduction degree of the power tube is controlled by the first control signal.

5. The centralized DC power supply device according to claim 1, characterized in that: It further includes a current threshold; the total monitoring unit obtains the loop current of each load loop, and outputs a second control signal based on the current threshold and the loop current of each load loop, and the second control signal is used to control the output power of the DC power module.

6. The centralized DC power supply device according to claim 1, characterized in that: Further includes a voltage threshold; the total monitoring unit obtains the voltage value of the current regulator of each load circuit, and outputs a third control signal based on the voltage threshold and the voltage value of the current regulator of each load circuit, and the third control signal is used to control the output power of the DC power module.

7. The centralized DC power supply device according to claim 1, characterized in that: The current balancing unit further includes a sub-monitoring unit, and the sub-monitoring unit includes a communication unit and a processing unit; The communication unit is used to realize the communication connection between the sub-monitoring unit and the main monitoring unit; The processing unit obtains the reference signal output by the overall monitoring unit through the communication unit, and transmits the reference signal to the control unit of each of the load loops.

8. The centralized DC power supply device according to claim 7, characterized in that: The processing unit also obtains the loop current of each load loop and transmits it to the overall monitoring unit through the communication unit.

9. The centralized DC power supply device according to claim 8, characterized in that: The processing unit further obtains the voltage value of the current regulator of each of the load circuits and transmits it to the overall monitoring unit through the communication unit.

10. The centralized DC power supply device according to claim 1, characterized in that: It comprises a plurality of the DC power modules and a plurality of the current balancing units, wherein the DC power modules correspond to the current balancing units one by one.

11. A power supply method using the centralized DC power supply device according to claim 1, characterized in that: The following steps are involved: The main monitoring unit obtains the output current or output voltage of the DC power module and outputs a reference signal; The control unit of each load loop obtains and outputs a first control signal to the current regulator corresponding to the load loop according to the reference signal and the loop current corresponding to the load loop.

12. The power supply method according to claim 11, characterized in that: The centralized DC power supply device is provided with a current threshold, and the steps further include: The main monitoring unit obtains the loop current and the current threshold of each load loop; The general monitoring unit compares the loop current of each load loop with the current threshold, and outputs a second control signal to the DC power module; When the loop current is less than the current threshold, the second control signal controls the output power of the DC power module to increase; When the loop current is greater than the current threshold, the second control signal controls the output power of the DC power module to be reduced; When the loop current is equal to the current threshold, return to the step: the total monitoring unit obtains the output current or output voltage of the DC power module and outputs a reference signal.

13. The power supply method according to claim 12, characterized in that: The centralized DC power supply device is provided with a voltage threshold, and the steps further include: The overall monitoring unit acquires the voltage value and the voltage threshold of the current regulator of each load circuit; The overall monitoring unit compares the voltage value of the current regulator of each load loop with the voltage threshold; When the voltage value of the current regulator of each load circuit is less than or equal to the voltage threshold, returning to the step: the overall monitoring unit acquires the voltage value of the current regulator of each load circuit and the voltage threshold; When the voltage value of the current regulator of each of the load loops is greater than the voltage threshold, the total monitoring unit outputs a third control signal to the DC power module, the third control signal controls the reduction of the output power of the DC power module, and returns to the step: the total monitoring unit obtains the voltage value of the current regulator of each of the load loops and the voltage threshold; The priority of the third control signal is higher than the priority of the second control signal.

14. The power supply method according to claim 12, characterized in that: The current balancing unit includes a sub-monitoring unit, the sub-monitoring unit is communicatively connected to the main monitoring unit, and a voltage threshold is set in the sub-monitoring unit. The steps further include: The sub-monitoring unit acquires the voltage value and the voltage threshold of the current regulator of each load loop; The sub-monitoring unit compares the voltage value of the current regulator of each load loop with the voltage threshold; When the voltage value of the current regulator of each load loop is less than or equal to the voltage threshold, returning to the step: the sub-monitoring unit acquires the voltage value of the current regulator of each load loop and the voltage threshold; When the voltage value of the current regulator of each of the load loops is greater than the voltage threshold, the sub-monitoring unit sends a request signal to the main monitoring unit; The main monitoring unit obtains and outputs a third control signal to the DC power module according to the request signal, wherein the third control signal controls the reduction of the output power of the DC power module, and returns to the step: the sub-monitoring unit obtains the voltage value and the voltage threshold of the current regulator of each load circuit; The priority of the third control signal is higher than the priority of the second control signal.

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