A constant current power supply optical network power supply system and power supply method

Abstract

The present invention discloses a constant current power supply optical network power supply system and a power supply method. At least one constant current power supply device is arranged between a near-end constant current power supply device and a far-end constant current power supply device, and the input end of each constant current power supply device is connected in series and the output end is connected in parallel. In each constant current power supply device, one control module and at least two constant voltage conversion modules with input ends connected in series and output ends connected in parallel are arranged. The control module calculates the real-time total output power of the constant current power supply device according to the real-time output power of each constant voltage conversion module, so as to judge the power demand of the power-consuming device, and dynamically control the working state of each constant voltage conversion module in real time, so as to achieve the purpose of adaptively adjusting the rated operating total power of the constant current power supply device according to the power demand of the power-consuming device, effectively improve the power conversion efficiency of the constant current power supply device when supplying power to the outside in a wide power range, and reduce thermal power consumption.

Description

Technical Field

[0001] The present invention relates to the field of long-distance power supply for optical network transmission, and in particular to a constant current power supply optical network power supply system and a power supply method. Background Art

[0002] Constant current power supply optical network has broad application prospects in underwater information systems such as long-distance optical fiber transmission network, optical fiber sensor network and optical fiber observation network, and information systems in unmanned areas on land. In addition to powering optical relay node equipment, constant current power supply optical network also needs to randomly provide large-capacity power supply to various parameter sensors, observation equipment and mobile robot charging and other power consumption equipment to meet various power consumption requirements of dynamic random access.

[0003] A constant current power supply optical network is usually equipped with one constant current power supply device at the near end and one at the far end, and there is at least one constant current power supply device and several power-consuming devices between the near-end constant current power supply device and the far-end constant current power supply device. The constant current power supply device is used to convert the local power supply, such as 220V power supply or 380V power supply, into a constant current power supply with a certain current value. The output current is constant, but the power supply voltage changes adaptively with the load. The constant current power supply device, as the load of the constant current power supply device, is used to convert the constant current power supply with a certain current value into a constant voltage power supply with a certain voltage value, and output a constant voltage power supply with a constant voltage to the outside, so as to power various parameter sensors, observation equipment, mobile robot charging and other power-consuming devices.

[0004] The existing constant current power supply technology usually stabilizes the voltage first and then couples, and then obtains the output voltage through voltage conversion. Its disadvantages are: in the voltage stabilization mode, the sum of the external output power and the thermal power consumption of the constant current power supply device is fixed, that is, the rated total operating power of the constant current power supply device is constant. When the external output power of the constant current power supply device decreases, its own thermal power consumption increases synchronously. When the actual external output power of the constant current power supply device increases, its own thermal power consumption decreases synchronously. In other words, when the constant current power supply device supplies power at a low power to the outside, most of the energy is lost as thermal power consumption, resulting in low power conversion efficiency and large energy waste; when multiple constant current power supply devices are used in series, the power demand is large, and the fixed rated total operating power limits the power supply capacity of the constant current power supply device and the power conversion efficiency of the constant current power supply device, and cannot meet the flexible and changeable power demand. Therefore, it is necessary to propose a constant current power supply optical network power supply system with high power conversion efficiency and the ability to adaptively adjust the rated total operating power according to the power demand of the power-consuming device. Summary of the invention

[0005] The present invention provides a constant current power supply optical network power supply system and power supply method, which solves the problems of "low power conversion rate and inability to adaptively adjust the rated operating total power according to the power demand of power-consuming equipment" existing in the prior art.

[0006] The present invention solves the technical problem through the following technical solutions:

[0007] A constant current power supply optical network power supply system comprises at least one constant current power supply device, wherein the input ends of the various constant current power supply devices are connected in series, and each constant current power supply device supplies power to an external power user device independently, or, wherein the input ends of two or more constant current power supply devices are connected in series and the output ends are connected in parallel to supply power to the same external power user device; in each constant current power supply device, a control module and at least two constant voltage conversion modules are included; the control module receives a constant current source of an external proximal constant current power supply device or the last constant current power supply device's last constant voltage conversion module, and the control module sends a control signal to each constant voltage conversion module to control the working state of each constant voltage conversion module; the input ends of the various constant voltage conversion modules are connected in series, and after the output ends of the various constant voltage conversion modules are connected in parallel, power is supplied to an external power user device, or, wherein the output ends of two or more constant current power supply devices are connected in parallel, power is supplied to an external power user device; the last constant voltage conversion module of the current constant current power supply device is connected to the control module of the next constant current power supply device or the external remote constant current power supply device.

[0008] Furthermore, the structures of the various constant voltage conversion modules are the same; in each constant voltage conversion module, it includes a management circuit, a low-voltage bypass power circuit at the constant voltage conversion end, a constant current adaptation circuit, a voltage conversion circuit and a monitoring circuit; the low-voltage bypass power circuit at the constant voltage conversion end receives the constant current power supply of the control module or the previous constant voltage conversion module, and powers the management circuit after coupling energy for low-voltage conversion, and the low-voltage bypass power circuit at the constant voltage conversion end also directly passes the constant current power supply from the control module or the previous constant voltage conversion module to the constant current adaptation circuit; the constant current adaptation circuit transmits the received constant current power supply to the next constant voltage conversion module in the current constant current power supply device, or the control module in the next constant current power supply device, or the remote The constant current power supply device at the end, the constant current adapter circuit also receives a control signal from the management circuit, the control signal is provided by the control module, the constant current adapter circuit couples energy and performs constant voltage stabilization processing under the control of the control signal to obtain a constant voltage power supply, and inputs the constant voltage power supply to the voltage conversion circuit for voltage conversion to power external electrical equipment, or the constant current adapter circuit does not couple energy for voltage stabilization control under the control of the control signal, at which time the constant voltage conversion module does not supply power to the outside; the monitoring circuit monitors the actual output current value and the actual output voltage value of the voltage conversion circuit, and inputs the actual output current value and the actual output voltage value into the management circuit, and then feeds back to the control module.

[0009] Furthermore, in each constant voltage conversion module, the low-voltage bypass circuit at the constant voltage conversion end includes a constant current direct-through subcircuit at the constant voltage conversion end, a coupling voltage-stabilizing subcircuit at the constant voltage conversion end, and a low-voltage conversion subcircuit at the constant voltage conversion end; the constant current direct-through subcircuit at the constant voltage conversion end receives the constant current power supply of the control module or the previous constant voltage conversion module, and directly passes the constant current power supply to the constant current adaptation circuit. At the same time, the energy is coupled to the coupling voltage-stabilizing subcircuit at the constant voltage conversion end for voltage stabilization control, and then the low-voltage conversion is realized through the low-voltage conversion subcircuit at the constant voltage conversion end to power the management circuit.

[0010] Furthermore, in each constant voltage conversion module, the constant current adaptation circuit mainly includes a controllable constant current sub-circuit, a series coupling sub-circuit, and a constant voltage stabilizing sub-circuit; the management circuit sends a control signal to the controllable constant current sub-circuit, and the controllable constant current sub-circuit receives the constant current power supply output by the low-voltage bypass circuit at the constant voltage conversion end, and under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device. At this time, the controllable constant current sub-circuit does not couple the energy output to the series coupling sub-circuit, and the constant voltage conversion module does not power the power-consuming device, or, under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device, and at the same time, under the control of the control signal, couples the energy output to the series coupling sub-circuit for voltage stabilization control to obtain a constant voltage DC power supply, and then inputs the constant voltage DC power supply into the constant voltage stabilizing sub-circuit for constant voltage stabilization, and then inputs it into the voltage conversion circuit.

[0011] Furthermore, in each constant voltage conversion module, the voltage conversion circuit includes a low-pass filter sub-circuit, a voltage conversion sub-circuit, and a voltage stabilizing filter sub-circuit; the low-pass filter sub-circuit performs low-pass filtering on the signal output by the constant current adaptation circuit, the voltage conversion sub-circuit performs voltage conversion on the signal output by the low-pass filter sub-circuit under the control of the management circuit, and the voltage stabilizing filter sub-circuit performs voltage stabilizing filtering on the output signal of the voltage conversion sub-circuit to supply power to external electrical equipment; the monitoring circuit monitors the actual output voltage value of the voltage conversion sub-circuit and the actual output current value of the voltage stabilizing filter sub-circuit.

[0012] Furthermore, in each constant voltage conversion module, the monitoring circuit mainly includes a current value monitoring sub-circuit and a voltage value monitoring sub-circuit; the voltage value monitoring sub-circuit monitors the actual output voltage value of the voltage conversion circuit, and inputs the actual output voltage value to the management circuit; the current value monitoring sub-circuit monitors the actual output current value of the voltage conversion circuit, and inputs the actual output current value to the management circuit.

[0013] Furthermore, in each constant current power supply device, the control module includes a control end low-voltage bypass power circuit, a CPU and a memory; the control module receives a constant current source of an external proximal constant current power supply device or the last constant current power supply device of a constant voltage conversion module at the end, and the control end low-voltage bypass power circuit couples energy to power the memory and the CPU, and the control end low-voltage bypass power circuit also directly passes the constant current source of the external proximal constant current power supply device or the last constant current power supply device of a constant voltage conversion module at the end to the next constant voltage conversion module; the CPU receives monitoring values ​​of each constant voltage conversion module, and sends control instructions to each constant voltage conversion module according to the monitoring values ​​to adjust the working status of each constant voltage conversion module; the memory stores the monitoring values.

[0014] Furthermore, in each control module, the control-end low-voltage bypass circuit includes a control-end constant-current direct-through subcircuit, a control-end coupled voltage-stabilizing subcircuit and a control-end low-voltage conversion subcircuit; the control-end constant-current direct-through subcircuit receives a constant-current current source and directly passes the constant-current current source to the next constant-voltage conversion module, and at the same time, couples energy output to the control-end coupled voltage-stabilizing sub-current for voltage stabilization control, and then sends it to the control-end low-voltage conversion subcircuit for voltage conversion to provide power for the CPU and memory.

[0015] A power supply method based on the above-mentioned constant current power supply optical network power supply system:

[0016] (1) In the current constant current power supply device, the control module calculates the real-time output power of the constant voltage conversion module according to the actual output voltage value and the actual output current value of the constant voltage conversion module, obtains the real-time total output power of the constant current power supply device to determine the power demand of the external power-consuming device, and controls the corresponding number of constant voltage conversion modules to be in operation; the actual output voltage value of the constant voltage conversion module in each operation state is within a preset range, or the difference between the sum of the actual output power values ​​of the constant voltage conversion modules in all operation states and the sum of the rated output power values ​​of the constant voltage conversion modules in all operation states is within a preset range;

[0017] (2) When the power demand of the external power-consuming equipment changes, the control module re-sends the control signal to the constant voltage conversion module according to the latest monitored actual output voltage value and actual output current value, thereby increasing or decreasing the number of constant voltage conversion modules in operation;

[0018] (3) When a constant voltage conversion module fails, the control module sends a control instruction to the constant voltage conversion module to put it in a standby state, and sends a control instruction to one of the other constant voltage conversion modules in the standby state to start a new constant voltage conversion module in an operating state.

[0019] Furthermore, in step (1), the actual output voltage value of the constant voltage conversion module in each operating state is greater than 90% of the rated output voltage value of a single constant voltage conversion module, or the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states minus the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states, the difference obtained is less than 10% of the rated output power value of a single constant voltage conversion module.

[0020] Compared with the existing technology, it has the following characteristics:

[0021] 1. At least one constant current power supply device is set between the near-end and far-end constant current power supply devices, and each constant current power supply device is connected in series. In each constant current power supply device, a control module and at least two constant voltage conversion modules with input terminals connected in series and output terminals connected in parallel are set. The control module can calculate the real-time output power of each constant voltage conversion module according to the actual output voltage value and the actual output current value of the constant voltage conversion module under each operating state monitored online, and obtain the real-time total output power of the constant current power supply device. The power demand of the power-consuming device is judged according to the real-time total output power, and the working state of each constant voltage conversion module is dynamically adjusted to avoid that the constant voltage conversion module is in an overload working state or a low-load working state, and also avoid that all constant voltage conversion modules are in an operating state when the constant current power supply device is not supplying power to the outside at maximum power, thereby reducing the thermal power consumption of the constant current power supply device and improving the power conversion efficiency. At the same time, the purpose of achieving a constant external output voltage but adaptively adjusting the rated operating total power according to the power demand of the power-consuming device is achieved, so that the power conversion efficiency of the constant current power supply device is basically the same when supplying high power and low power to the outside;

[0022] 2. A management circuit, a constant voltage conversion end low-voltage bypass circuit, a constant current adaptation circuit, a voltage conversion circuit and a monitoring circuit are provided in each constant voltage conversion module. The management circuit controls the working state of the current constant voltage conversion module according to the instruction of the control module. The monitoring circuit monitors the voltage value and current value output by the current constant voltage conversion module and feeds back to the control module. Other circuits complete the constant voltage conversion function. The control module can obtain the actual output voltage value and the actual output current value of each constant voltage conversion module in real time, calculate the real-time output power of the constant voltage conversion module according to the actual output voltage value and the actual output current value of each constant voltage conversion module, judge whether each constant voltage conversion module is in an overload or underload state, perceive the power demand of the power-consuming equipment through the workload of the constant voltage conversion module, adjust the working state of each constant voltage conversion module in real time, control each constant voltage conversion module to be in an operating state or a standby state, so as to achieve the purpose of adaptively adjusting the rated total operating power of the constant current power-taking equipment, effectively improve the power conversion efficiency of the constant current power-taking equipment, and reduce thermal power consumption;

[0023] 3. The input ends of each constant voltage conversion module in the constant current power supply device are connected in series. The constant voltage conversion modules in different working states do not affect each other. When a constant voltage conversion module fails, it will not affect the series connection of the input end. The control module can automatically start a constant voltage conversion module in standby state to replace the failed constant voltage conversion module to ensure the normal operation of the constant current power supply device and improve the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural principle block diagram of the present invention.

[0025] Figure 2 This is the structural principle block diagram of the constant voltage conversion module.

[0026] Figure 3 This is the structural principle block diagram of the low-voltage bypass circuit at the constant voltage conversion end.

[0027] Figure 4 This is the structural principle block diagram of the constant current adaptation circuit.

[0028] Figure 5 This is the structural principle block diagram of the voltage conversion circuit.

[0029] Figure 6 This is the structural principle block diagram of the monitoring circuit.

[0030] Figure 7 This is the structural principle block diagram of the management circuit.

[0031] Figure 8 This is the structural principle block diagram of the control module.

[0032] Fig. 9 This is the structural principle block diagram of the low-voltage bypass circuit at the control end. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to examples, but the present invention is not limited to these examples.

[0034] A constant current power supply optical network power supply system, such as Figure 1 As shown, it includes at least one constant current power-taking device, the input ends of each constant current power-taking device are connected in series, and each constant current power-taking device supplies power to its own external power-consuming device separately. When the external output power of a single constant current power-taking device cannot meet the power demand, the input ends of two or more constant current power-taking devices can be connected in series and the output ends can be connected in parallel to supply power to the same external power-consuming device.

[0035] In each constant current power supply device, a control module and at least two constant voltage conversion modules are included; the control module is connected to an external proximal constant current power supply device or the last constant current power supply device's end constant voltage conversion module, and receives the constant current source of the external proximal constant current power supply device or the last constant current power supply device's end constant voltage conversion module; the control module is also connected to the control end of each constant voltage conversion module, sends a control signal to each constant voltage conversion module, and controls the working state of each constant voltage conversion module, such as the running state or the standby state; the input ends of each constant voltage conversion module are connected in series, and the output ends of each constant voltage conversion module are connected in parallel to supply power to an external power user, or the output ends of two or more constant current power supply devices can be connected in parallel to supply power to the same external power user; the end constant voltage conversion module of the current constant current power supply device is connected to the control module of the next constant current power supply device or the external remote constant current power supply device.

[0036] exist Figure 1 In the embodiment, there are M (M≥1) constant current power taking devices, namely the first constant current power taking device, the second constant current power taking device, and the Mth constant current power taking device. The input ends of the various constant current power taking devices are connected in series, and the output ends directly supply power to the respective power consuming devices. Alternatively, when the external output power of a single constant current power taking device cannot meet the requirements, the input ends of two or more constant current power taking devices are connected in series while the output ends are connected in parallel to supply power to the same external power consuming device.

[0037] In each constant voltage conversion module, a management circuit, a low-voltage bypass circuit at the constant voltage conversion end, a constant current adaptation circuit, a voltage conversion circuit and a monitoring circuit are included; the management circuit is connected to the control module; the input end of the low-voltage bypass circuit at the constant voltage conversion end is connected to the control module or the previous constant voltage conversion module in the current constant current power-taking device, one output end of the low-voltage bypass circuit at the constant voltage conversion end is connected to the power supply end of the management circuit, and the other output end of the low-voltage bypass circuit at the constant voltage conversion end is connected to the next constant voltage conversion module of the current constant current power-taking device, or the control end of the next constant current power-taking device via the constant current adaptation circuit. Module, or external remote constant current power supply device, the low-voltage bypass power circuit at the constant voltage conversion end receives the constant current power of the previous constant voltage conversion module in the control module or the current constant current power supply device, couples part of the energy for low-voltage conversion to power the management circuit, and the low-voltage bypass power circuit at the constant voltage conversion end also directly passes the constant current power from the previous constant voltage conversion module in the control module or the current constant current power supply device to the constant current adaptation circuit, and the constant current adaptation circuit transmits the received constant current power to the next constant voltage conversion module of the current constant current power supply device, or the control module of the next constant current power supply device, or the remote constant current power supply device; One output end of the management circuit is connected to the control end of the voltage conversion circuit, and the other output end of the management circuit is connected to the control end of the constant current adaptation circuit. The output end of the constant current adaptation circuit is connected to the input end of the voltage conversion circuit; the constant current adaptation circuit also receives a control signal from the management circuit, and the control signal is provided by the control module. The constant current adaptation circuit performs constant voltage stabilization processing under the control of the control signal to obtain a constant voltage power supply, and inputs the constant voltage power supply to the voltage conversion circuit for voltage conversion to obtain the voltage required for the operation of the electrical equipment, thereby supplying power to the external electrical equipment. At this time, the constant voltage conversion module The block is in operation state; or, under the control of the control signal, the constant current adapter circuit does not couple energy to the voltage conversion circuit, and the constant voltage conversion module does not output power to the electrical equipment. At this time, the constant voltage conversion module is in standby state; one output end of the voltage conversion circuit is connected to the input end of the monitoring circuit, and the other output end of the voltage conversion circuit is connected to the power supply end of the external electrical equipment; the output signal of the monitoring circuit is transmitted to the control module via the management circuit, and the monitoring circuit monitors the actual output current value and the actual output voltage value of the voltage conversion circuit, and inputs the monitoring value into the management circuit, and then feeds back to the control module. The structural principle block diagram of the constant voltage conversion module is shown in the figure. Figure 2 shown.

[0038] pass Figure 1It can be seen that each constant current power-taking device is provided with N (N≥2) constant voltage conversion modules, namely the first constant voltage conversion module, the second constant voltage conversion module, and the Nth constant voltage conversion module. The structures and performances of the constant voltage conversion modules are the same, and each constant voltage conversion module is controlled by the control module of the constant current power-taking device in which it is located. The input ends of the constant voltage conversion modules of the current constant current power-taking device are connected in series, and the output ends of the constant voltage conversion modules are connected in parallel to supply power to the external power-consuming device, or the current constant current power-taking device is connected in series with the input ends of other constant current power-taking devices, and the output ends are connected in parallel to supply power to the same external power-consuming device. Regardless of whether the constant voltage conversion module is in a fault state, a standby state, or an operating state, the series connection of the input end will not be affected, and the constant voltage conversion modules will not affect each other's working state, thereby ensuring the normal operation of the constant current power-taking device.

[0039] The present invention also has a chassis, in which the control module and each constant voltage conversion module are arranged. At least two slots are arranged in the chassis, the number of the slots is greater than or equal to the number of the constant voltage conversion modules, each constant voltage conversion module is electrically connected to the control module through the slot, and the output ends of the constant voltage conversion modules are connected in parallel through the slots.

[0040] The slot is provided with a pin, and each constant voltage conversion module is electrically connected to the control module via the pin, and the output ends of each constant voltage conversion module are electrically connected via the slot; the constant voltage conversion module is provided with a detection end, and when the constant voltage conversion module is plugged in or out, the constant voltage conversion module moves in position during the insertion or removal process, resulting in connection or disconnection at the pin of the constant voltage conversion module, causing the level of the pin to change, and the detection end of the constant voltage conversion module detects the level change of the pin, and the management circuit of the constant voltage conversion module feeds back the level change to the control module, which is used as a basis for controlling the increase or decrease of the number of constant voltage conversion modules.

[0041] By increasing or decreasing the number of constant voltage conversion modules, the maximum rated total power of the constant current power-taking device is changed, so as to achieve the purpose of expanding the capacity of the constant current power-taking device. The purpose of arbitrary expansion can be achieved without developing new equipment, thereby improving the scope of application of the device. The control module sends a control signal to each constant voltage conversion module, so that each constant voltage conversion module is in operation or standby state respectively. The constant voltage conversion module in operation outputs voltage and current to the outside, and the constant voltage conversion module in standby state does not output voltage and current to the outside. The constant voltage conversion module in standby state does not generate heat power consumption. The rated total operating power of the constant current power-taking device is changed by controlling the number of constant voltage conversion modules in operation. The control module calculates the real-time output power of the constant voltage conversion module according to the voltage and current values ​​actually output by each constant voltage conversion module in operation, determines whether each constant voltage conversion module is in an overload or underload state, senses the power demand of the electrical equipment through the workload of the constant voltage conversion module, controls a corresponding number of constant voltage conversion modules to be in operation according to the power demand, and dynamically controls the working state of each constant voltage conversion module in real time, so that the constant current power-taking equipment operates in a non-maximum rated total power state, thereby achieving the purpose of adaptively adjusting the rated operating total power of the constant current power-taking equipment, effectively improving the power conversion efficiency of the constant current power-taking equipment, and reducing thermal power consumption.

[0042] In each constant voltage conversion module, the low-voltage bypass circuit at the constant voltage conversion end includes a constant current direct-through subcircuit at the constant voltage conversion end, a coupling voltage-stabilizing subcircuit at the constant voltage conversion end, and a low-voltage conversion subcircuit at the constant voltage conversion end; the input end of the constant current direct-through subcircuit at the constant voltage conversion end is connected to the control module or the previous constant voltage conversion module in the current constant current power-taking device, one output end of the constant current direct-through subcircuit at the constant voltage conversion end is connected to the constant current adaptation circuit, and another output end of the constant current direct-through subcircuit at the constant voltage conversion end is connected to the input end of the coupling voltage-stabilizing subcircuit at the constant voltage conversion end; the output end of the coupling voltage-stabilizing subcircuit at the constant voltage conversion end is connected to the input end of the low-voltage conversion subcircuit at the constant voltage conversion end; and the output end of the low-voltage conversion subcircuit at the constant voltage conversion end is connected to the management circuit. The structural principle block diagram of the low-voltage bypass circuit at the constant voltage conversion end is shown in the figure below. Figure 3 shown.

[0043] The constant current direct-through subcircuit at the constant voltage conversion end receives the constant current power supply of the control module or the previous constant voltage conversion module, and directly passes it to the constant current adaptation circuit. At the same time, it couples part of the energy to the constant voltage conversion end coupling voltage stabilization subcircuit for voltage stabilization control, and then realizes low voltage conversion through the constant voltage conversion end low voltage conversion subcircuit to power the management circuit. In the present invention, 1.0W of energy is coupled to the constant voltage conversion end coupling voltage stabilization subcircuit, and after voltage stabilization control, a DC 3.3V power supply is output to the constant voltage conversion end low voltage conversion subcircuit, and the constant voltage conversion end low voltage conversion subcircuit converts the DC 3.3V power supply into DC 1.2V, DC 1.8V and DC 2.5V, and outputs it to the management circuit.

[0044] In each constant voltage conversion module, the constant current adaptation circuit mainly includes a controllable constant current sub-circuit, a series coupling sub-circuit, and a constant voltage stabilizing sub-circuit; the management circuit is connected to the control end of the controllable constant current sub-circuit; the input end of the controllable constant current sub-circuit is connected to the low-voltage bypass circuit of the constant voltage conversion end, and one output end of the controllable constant current sub-circuit is connected to the next constant voltage conversion module in the current constant current power supply device, or the control module in the next constant current power supply device, or the external remote constant current power supply device, and the other output end of the controllable constant current sub-circuit is connected to the voltage conversion circuit via the series coupling sub-circuit and the constant voltage stabilizing sub-circuit. The constant current adaptation circuit also includes a constant current adaptation end management interface sub-circuit, and the management circuit is connected to the control end of the controllable constant current sub-circuit through the constant current adaptation end management interface sub-circuit. The structural principle block diagram of the constant current adaptation circuit is shown in the figure. Figure 4 shown.

[0045] In each constant voltage conversion module, the management circuit sends a control signal to the controllable constant current sub-circuit, and the controllable constant current sub-circuit receives the constant current power supply output by the low-voltage bypass circuit at the constant voltage conversion end, and under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device. At this time, the controllable constant current sub-circuit does not couple the energy output to the series coupling sub-circuit, and the constant voltage conversion module does not supply power to the power-consuming device. The constant voltage conversion module is in a standby state, or, under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device. At the same time, the controllable constant current sub-circuit couples part of the energy output to the series coupling sub-circuit for voltage stabilization control to obtain a constant voltage DC power supply, and then inputs the constant voltage DC power supply into the constant voltage stabilization sub-circuit for constant voltage stabilization, and then inputs it into the voltage conversion circuit to supply power to the power-consuming device. At this time, the constant voltage conversion module is in an operating state. In the present invention, the coupled 55W energy is output to the series coupling subcircuit, and the series coupling subcircuit outputs a 55V constant voltage DC power supply to the constant voltage stabilizing subcircuit, and the voltage fluctuation is eliminated after voltage stabilizing control to ensure that the fluctuation is controlled within the range of ±1%, and then the processing result is output to the voltage conversion circuit. In addition, when the 55W energy is coupled to the series coupling subcircuit, the constant voltage conversion module where it is located is in operation, otherwise, it is in standby state.

[0046] In each constant voltage conversion module, the voltage conversion circuit includes a low-pass filter sub-circuit, a voltage conversion sub-circuit, and a voltage stabilizing filter sub-circuit; the input end of the low-pass filter sub-circuit is connected to the constant current adaptation circuit, and the output end of the low-pass filter sub-circuit is connected to the external electrical equipment via the voltage conversion sub-circuit and the voltage stabilizing filter sub-circuit; the management circuit is connected to the control end of the voltage conversion sub-circuit; the test interface of the voltage conversion sub-circuit is connected to the monitoring circuit; the test interface of the voltage stabilizing filter sub-circuit is connected to the monitoring circuit. The voltage conversion circuit also includes a voltage conversion end management interface sub-circuit, and the management circuit is connected to the voltage conversion sub-circuit control end through the voltage conversion end management interface sub-circuit. The structural principle block diagram of the voltage conversion circuit is shown in the figure below. Figure 5 shown.

[0047] In the present invention, a low-pass filter subcircuit receives a 55V DC power supply output by a constant current adapter circuit for low-pass filtering, filters out power supply noise with a frequency of more than 30Hz, and then outputs the power supply to a voltage conversion subcircuit; the voltage conversion subcircuit performs voltage conversion on a signal output by the low-pass filter subcircuit under the control of a control signal sent by a management circuit, converts the 55V DC power supply into one or two DC voltages such as 5V, 12V, 24V, 48V, 72V or 375V, and outputs the voltage to a voltage stabilizing filter subcircuit; the voltage stabilizing filter subcircuit performs voltage stabilizing filtering on one or two DC voltages received, controls voltage fluctuation within a range of ±1%, and simultaneously filters out power supply noise generated by voltage conversion with a frequency of more than 30Hz, outputs the DC power supply after voltage stabilization filtering to an electrical device, and simultaneously provides a test interface for connection to a monitoring circuit; the monitoring circuit monitors an actual output voltage value of the voltage conversion subcircuit and an actual output current value of the voltage stabilizing filter subcircuit; the voltage conversion end management interface subcircuit outputs a control signal sent by the management circuit to the voltage conversion subcircuit after interface conversion and adaptation, for controlling voltage conversion.

[0048] In each constant voltage conversion module, the monitoring circuit mainly includes a current value monitoring subcircuit and a voltage value monitoring subcircuit; the voltage value monitoring subcircuit monitors the voltage value of the voltage conversion circuit and inputs the voltage value to the management circuit; the current value monitoring subcircuit monitors the current value of the voltage conversion circuit and inputs the current value to the management circuit. The monitoring circuit also includes a monitoring end management interface subcircuit, the output end of the current value monitoring subcircuit is connected to the management circuit via the monitoring end management interface subcircuit, and the output end of the voltage value monitoring subcircuit is connected to the management circuit via the monitoring end management interface subcircuit. The structural principle block diagram of the monitoring circuit is shown in the figure. Figure 6 The current value monitoring subcircuit monitors the actual output current of the voltage conversion circuit in real time, and the voltage value monitoring subcircuit monitors the actual output voltage of the voltage conversion circuit in real time. The monitoring value is input into the management circuit via the monitoring end management interface subcircuit.

[0049] In each constant voltage conversion module, the management circuit includes a central processing unit subcircuit, a memory subcircuit, a control interface subcircuit, a monitoring interface subcircuit, a management end management interface subcircuit and a power interface subcircuit; the power interface subcircuit is connected to the output end of the low-voltage bypass power circuit at the conversion end, receives various power supplies provided by the low-voltage bypass power circuit at the conversion end, and provides working voltage for the central processing unit subcircuit, the memory subcircuit, the control interface subcircuit, the monitoring interface subcircuit and the management end management interface subcircuit; the memory subcircuit is connected to the central processing unit subcircuit to store monitoring data; the central processing unit subcircuit is connected to the control module via the control interface subcircuit, receives the control signal sent by the control module, and the control signal forwarded by the central processing unit subcircuit is sent to the constant current adaptation circuit and the voltage conversion circuit after interface adaptation by the management end management interface subcircuit, which is used to adjust the working state of the constant current adaptation circuit and the voltage conversion circuit, and control the output voltage of the constant voltage conversion module in operation; the monitoring data of the monitoring circuit is input into the central processing unit subcircuit via the monitoring interface subcircuit, and then fed back to the control module via the control interface subcircuit. The structural principle block diagram of the management circuit is shown as follows: Figure 7 shown.

[0050] In each constant current power supply device, the control module includes a control-end low-voltage bypass power circuit, a CPU and a memory; the input end of the control-end low-voltage bypass power circuit is connected to an external proximal constant current power supply device or the last constant current power supply device's end constant voltage conversion module, the output end of the control-end low-voltage bypass power circuit is connected to the next constant voltage conversion module, the control-end low-voltage bypass power circuit provides power supply for the memory and CPU; the memory is connected to the CPU; the CPU is connected to each constant voltage conversion module. It also includes a control interface; the control-end low-voltage bypass power circuit supplies power to the control interface, and the CPU is connected to each constant voltage conversion module through the control interface. The structural principle block diagram of the control module is shown in the figure. Figure 8 shown.

[0051] The control module receives the constant current source of the constant voltage conversion module at the end of the near-end constant current power supply device or the last constant current power supply device, couples out part of the energy through the low-voltage bypass circuit at the control end, and powers the memory, CPU and control interface after processing. At the same time, the low-voltage bypass circuit at the control end also directly passes the constant current source of the constant voltage conversion module at the end of the near-end constant current power supply device or the last constant current power supply device to the next constant voltage conversion module; the CPU receives the actual output current value and the actual output voltage value monitored by each constant voltage conversion module through the control interface, calculates the actual output power of each constant voltage conversion module according to the monitoring value, obtains the real-time total output power of the constant current power supply device, and determines whether each constant voltage conversion module is in an overload or underload state according to the size of the real-time output power, senses the power demand of the power-consuming equipment through the workload of the constant voltage conversion module, sends control instructions to each constant voltage conversion module, and dynamically adjusts the working state of each constant voltage conversion module in real time to meet the power demand of the power-consuming equipment; the memory stores the monitoring value.

[0052] In each control module, the control-end low-voltage bypass circuit includes a control-end constant-current direct-through subcircuit, a control-end coupled voltage-stabilizing subcircuit and a control-end low-voltage conversion subcircuit; the input end of the control-end constant-current direct-through subcircuit is connected to the constant-voltage conversion module at the end of the proximal constant-current power supply device or the last constant-current power supply device, one output end of the control-end constant-current direct-through subcircuit is connected to the next constant-voltage conversion module, and another output end of the control-end constant-current direct-through subcircuit is connected to the input end of the control-end coupled voltage-stabilizing subcircuit; the output end of the control-end coupled voltage-stabilizing subcircuit is connected to the input end of the control-end low-voltage conversion subcircuit; the output end of the control-end low-voltage conversion subcircuit is connected to the CPU, control interface and memory. The structural principle block diagram of the control-end low-voltage bypass circuit is shown in the figure below. Fig. 9 shown.

[0053] The control end constant current direct-through subcircuit receives the constant current source of the constant voltage conversion module at the end of the near-end constant current power supply device or the last constant current power supply device, and directly passes it to the next constant voltage conversion module. At the same time, it couples part of the energy output to the control end coupling voltage stabilizing sub-current for voltage stabilization control, and then sends the output voltage to the control end low-voltage conversion subcircuit for voltage conversion, thereby supplying power to the CPU, memory and control interface. In the present invention, the control end constant current direct-through subcircuit couples 1.0W of energy output to the control end coupling voltage stabilizing subcircuit, and obtains a DC 3.3V power supply after voltage stabilization control. After the control end low-voltage conversion subcircuit, the DC 3.3V power supply is converted into DC 1.2V, DC 1.8V and DC 2.5V, which are used to provide power for the CPU, memory and control interface.

[0054] A method for obtaining power from a constant current power supply optical network power supply system, as follows:

[0055] (1) In the current constant current power supply device, the control module calculates the real-time output power of the constant voltage conversion module according to the actual output voltage value and the actual output current value of the constant voltage conversion module, obtains the real-time total output power of the constant current power supply device, judges whether each constant voltage conversion module is in an overload working state or an underload working state, perceives the power demand of the power-consuming equipment through the workload of each constant voltage conversion module, dynamically and real-time adjusts the working state of each constant voltage conversion module, such as the operating state or the standby state, so that the constant current power supply device operates in a non-maximum rated total power state, so as to achieve the purpose of adaptively adjusting the rated operating total power of the constant current power supply device; the actual output voltage value of the constant voltage conversion module in each operating state is within a preset range, or the difference obtained by subtracting the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states from the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states is within a preset range;

[0056] (2) When the power demand of the external power-consuming equipment changes, the control module recalculates the real-time output power of the constant voltage conversion module according to the latest monitored actual output voltage value and actual output current value, obtains the real-time total output power of the constant current power-taking equipment, and then sends a control signal to the constant voltage conversion module to increase or decrease the number of constant voltage conversion modules in operation;

[0057] (3) When a constant voltage conversion module fails, the control module sends a control instruction to the constant voltage conversion module to put it in a standby state, and sends a control instruction to one of the other constant voltage conversion modules in the standby state to start a new constant voltage conversion module in an operating state.

[0058] In step (1), when the control module detects that the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states minus the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states is still greater than or equal to the rated power of a single constant voltage conversion module, the control module first shuts down one of the constant voltage conversion modules in the operating state and continues to monitor the new actual output voltage value and the actual output current value. When the control module monitors that the actual output voltage value of a certain constant voltage conversion module is less than or equal to 90% of its rated output voltage value, or the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states minus the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states, the difference obtained is greater than or equal to 10% of the rated output power value of a single constant voltage conversion module, the control module turns on a new constant voltage conversion module in standby state, puts it in operating state, and continues to monitor the new actual output voltage value and actual output current value until the actual output voltage value of the constant voltage conversion module in each operating state is greater than 90% of the rated output voltage value of a single constant voltage conversion module, or the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states minus the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states, the difference obtained is less than 10% of the rated output power value of a single constant voltage conversion module.

[0059] In step (2), when the power demand of the electrical equipment increases, when the control module monitors that the output voltage value of a certain constant voltage conversion module is less than or equal to 90% of the rated voltage value, or the difference obtained by subtracting the sum of the actual output power values ​​of all constant voltage conversion modules in operation from the sum of the rated output power values ​​of all constant voltage conversion modules in operation is greater than or equal to 10% of the rated power value of a single constant voltage conversion module, the control module turns on a new constant voltage conversion module in standby state to put it in operation, and monitors the new actual output voltage value and the actual output current value. By increasing the number of constant voltage conversion modules in operation, the rated total operating power of the constant current power-taking equipment is increased, the external output power of the constant current power-taking equipment is increased, and the dynamic and arbitrary expansion of the constant current power-taking equipment is achieved while meeting the power demand of the electrical equipment.

[0060] In step (2), when the power demand of the electrical equipment decreases, when the difference between the sum of the rated output power values ​​of all the constant voltage conversion modules in operation and the sum of the actual output power values ​​of all the constant voltage conversion modules in operation is greater than or equal to the rated output power value of a single constant voltage conversion module, the control module shuts down a certain constant voltage conversion module in operation to put it in standby mode, thereby reducing the rated total operating power of the constant current power-taking equipment by reducing the number of constant voltage conversion modules in operation and reducing the thermal power consumption of the constant current power-taking equipment. By increasing or decreasing the number of constant voltage conversion modules in operation to increase or decrease the rated total operating power of the constant current power-taking equipment, while meeting the power demand of the electrical equipment, the power conversion efficiency of the constant current power-taking equipment when outputting power to the outside within a wide power range is improved, thereby reducing the thermal power consumption of the equipment.

[0061] In step (3), since the operating states of the various constant voltage conversion modules are independent of each other, they can be in operation or standby state respectively without interfering with each other. The control module can control the operating state of each constant voltage conversion module, adjust the faulty constant voltage conversion module to the standby state, adjust the constant voltage conversion module that is normally in the standby state to the operating state, replace the faulty constant voltage conversion module, and realize automatic protection switching, online maintenance and replacement of the constant voltage conversion module, thereby improving the reliability of the constant current power supply equipment and ensuring the normal operation of the power supply system.

[0062] According to (2) and (3), no matter the power demand changes or the constant voltage conversion module fails, the control module can automatically control the number of constant voltage conversion modules in operation, adaptively change the working state of the constant voltage conversion module, and dynamically adjust the rated total operating power and external output power of the constant current power supply equipment. The rated total operating power increases and decreases synchronously with the external output power, so as to improve the power conversion efficiency of the constant current power supply equipment and reduce thermal power consumption.

[0063] The constant current power supply device of the present invention can adapt to the output current range of 0.3-5.0A, and the output voltage range of -20Kv to 20Kv. The output power of a single constant voltage conversion module can reach more than 50W, and the rated output power of the constant current power supply device composed of multiple constant voltage conversion modules can reach more than 4000W. According to the power consumption needs of the power consumption equipment, the constant current power supply device can flexibly and automatically set the rated total operating power and the rated external output power between 50-4000W, thereby improving the power conversion efficiency of the constant current power supply device between 50-4000W. The full-scale power conversion efficiency when the external output power is 50-4000W is ≥90%, and the output DC voltage of the constant current power supply device can be configured as DC voltages such as 5V, 12V, 24V, 48V, 72V and 375V, and the maximum rated output power can reach more than 4000W.

Claims

1. A constant current power supply optical network power supply system, characterized in that: It includes at least one constant current power taking device, the input ends of each constant current power taking device are connected in series, and each constant current power taking device supplies power to an external power-consuming device independently, or, the input ends of two or more constant current power taking devices are connected in series and the output ends are connected in parallel to supply power to the same external power-consuming device; In each constant current power-taking device, a control module and at least two constant voltage conversion modules are included; the control module receives the constant current source of the constant voltage conversion module at the end of the external proximal constant current power supply device or the last constant current power supply device, and the control module sends a control signal to each constant voltage conversion module to control the working state of each constant voltage conversion module; the input ends of each constant voltage conversion module are connected in series, and the output ends of each constant voltage conversion module are connected in parallel to supply power to the external power-consuming device, or the output ends of two or more constant current power-taking devices are connected in parallel to supply power to the external power-consuming device; the constant voltage conversion module at the end of the current constant current power-taking device is connected to the control module of the next constant current power-taking device or the external remote constant current power supply device; The structures of the various constant voltage conversion modules are the same; Each constant voltage conversion module includes a management circuit, a low voltage bypass circuit at the constant voltage conversion end, a constant current adaptation circuit, a voltage conversion circuit and a monitoring circuit; The low-voltage bypass power circuit at the constant voltage conversion end receives the constant current power supply of the control module or the previous constant voltage conversion module, and powers the management circuit after coupling energy for low voltage conversion. The low-voltage bypass power circuit at the constant voltage conversion end also directly passes the constant current power supply from the control module or the previous constant voltage conversion module to the constant current adaptation circuit; the constant current adaptation circuit transmits the received constant current power supply to the next constant voltage conversion module in the current constant current power supply device, or the control module in the next constant current power supply device, or the remote constant current power supply device. The constant current adaptation circuit also receives the control signal of the management circuit, and the control signal Provided by the control module, the constant current adapter circuit couples energy and performs constant voltage stabilization processing under the control of the control signal to obtain a constant voltage power supply, and inputs the constant voltage power supply to the voltage conversion circuit for voltage conversion to power external electrical equipment, or the constant current adapter circuit does not couple energy for voltage stabilization control under the control of the control signal, and at this time the constant voltage conversion module does not supply power to the outside; the monitoring circuit monitors the actual output current value and the actual output voltage value of the voltage conversion circuit, and inputs the actual output current value and the actual output voltage value into the management circuit, and then feeds back to the control module.

2. A constant current power supply optical network power supply system according to claim 1, characterized in that: In each constant voltage conversion module, the constant voltage conversion end low voltage bypass circuit includes a constant voltage conversion end constant current direct-through subcircuit, a constant voltage conversion end coupling voltage stabilization subcircuit and a constant voltage conversion end low voltage conversion subcircuit; The constant current direct-pass subcircuit at the constant voltage conversion end receives the constant current power supply of the control module or the previous constant voltage conversion module, and directly passes the constant current power supply to the constant current adaptation circuit. At the same time, it couples the energy to the constant voltage conversion end coupling voltage stabilization subcircuit for voltage stabilization control, and then realizes low voltage conversion through the constant voltage conversion end low voltage conversion subcircuit to power the management circuit.

3. A constant current power supply optical network power supply system according to claim 1, characterized in that: In each constant voltage conversion module, the constant current adaptation circuit mainly includes a controllable constant current sub-circuit, a series coupling sub-circuit, and a constant voltage stabilization sub-circuit; The management circuit sends a control signal to the controllable constant current sub-circuit, and the controllable constant current sub-circuit receives the constant current power supply output by the low-voltage bypass circuit at the constant voltage conversion end, and under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device. At this time, the controllable constant current sub-circuit does not couple the energy output to the series coupling sub-circuit, and the constant voltage conversion module does not power the power-consuming device, or, under the control of the control signal, directly connects the constant current power supply to the next constant voltage conversion module in the current constant current power-taking device, or the control module in the next constant current power-taking device, or the remote constant current power supply device, and at the same time, under the control of the control signal, couples the energy output to the series coupling sub-circuit for voltage stabilization control to obtain a constant voltage DC power supply, and then inputs the constant voltage DC power supply into the constant voltage stabilization sub-circuit for constant voltage stabilization, and then inputs it into the voltage conversion circuit.

4. A constant current power supply optical network power supply system according to claim 1, characterized in that: In each constant voltage conversion module, the voltage conversion circuit includes a low-pass filter sub-circuit, a voltage conversion sub-circuit, and a voltage stabilizing filter sub-circuit; the low-pass filter sub-circuit performs low-pass filtering on the signal output by the constant current adaptation circuit, and the voltage conversion sub-circuit performs voltage conversion on the signal output by the low-pass filter sub-circuit under the control of the management circuit, and the voltage stabilizing filter sub-circuit performs voltage stabilizing filtering on the output signal of the voltage conversion sub-circuit to supply power to external electrical equipment; the monitoring circuit monitors the actual output voltage value of the voltage conversion sub-circuit and the actual output current value of the voltage stabilizing filter sub-circuit.

5. A constant current power supply optical network power supply system according to claim 1, characterized in that: In each constant voltage conversion module, the monitoring circuit mainly includes a current value monitoring sub-circuit and a voltage value monitoring sub-circuit; the voltage value monitoring sub-circuit monitors the actual output voltage value of the voltage conversion circuit, and inputs the actual output voltage value to the management circuit; the current value monitoring sub-circuit monitors the actual output current value of the voltage conversion circuit, and inputs the actual output current value to the management circuit.

6. A constant current power supply optical network power supply system according to claim 1, characterized in that: In each constant current power supply device, the control module includes a control end low voltage bypass circuit, a CPU and a memory; The control module receives the constant current source of the constant voltage conversion module at the end of an external proximal constant current power supply device or a previous constant current power supply device, and the control end low-voltage bypass power circuit couples energy to power the memory and the CPU. The control end low-voltage bypass power circuit also directly passes the constant current source of the constant voltage conversion module at the end of an external proximal constant current power supply device or a previous constant current power supply device to the next constant voltage conversion module; the CPU receives the monitoring values ​​of each constant voltage conversion module, and sends control instructions to each constant voltage conversion module according to the monitoring values ​​to adjust the working status of each constant voltage conversion module; the memory stores the monitoring values.

7. A constant current power supply optical network power supply system according to claim 6, characterized in that: In each control module, the control-end low-voltage bypass circuit includes a control-end constant-current direct-through subcircuit, a control-end coupled voltage-stabilizing subcircuit and a control-end low-voltage conversion subcircuit; the control-end constant-current direct-through subcircuit receives a constant-current current source and directly passes the constant-current current source to the next constant-voltage conversion module, and at the same time, couples energy output to the control-end coupled voltage-stabilizing sub-current for voltage stabilization control, and then sends it to the control-end low-voltage conversion subcircuit for voltage conversion to power the CPU and memory.

8. A method for obtaining power from a constant current power supply optical network power supply system according to any one of claims 1 to 7, characterized in that: (1) In the current constant current power taking device, the control module calculates the real-time output power of the constant voltage conversion module according to the actual output voltage value and the actual output current value of the constant voltage conversion module, obtains the real-time total output power of the constant current power taking device to determine the power demand of the external power-consuming device, and controls the corresponding number of constant voltage conversion modules to be in operation; The actual output voltage value of the constant voltage conversion module in each operating state is within a preset range, or the difference obtained by subtracting the sum of the rated output power values ​​of the constant voltage conversion modules in all operating states from the sum of the actual output power values ​​of the constant voltage conversion modules in all operating states is within a preset range; (2) When the power demand of the external power-consuming equipment changes, the control module re-sends the control signal to the constant voltage conversion module according to the latest monitored actual output voltage value and actual output current value, thereby increasing or decreasing the number of constant voltage conversion modules in operation; (3) When a constant voltage conversion module fails, the control module sends a control instruction to the constant voltage conversion module to put it in a standby state, and sends a control instruction to one of the other constant voltage conversion modules in the standby state to start a new constant voltage conversion module in an operating state.

9. A method for obtaining power from a constant current power supply optical network power supply system according to claim 8, characterized in that: In step (1), the actual output voltage value of the constant voltage conversion module under each operating state is greater than 90% of the rated output voltage value of a single constant voltage conversion module, or the sum of the actual output power values ​​of the constant voltage conversion modules under all operating states minus the sum of the rated output power values ​​of the constant voltage conversion modules under all operating states, the difference obtained is less than 10% of the rated output power value of a single constant voltage conversion module.

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