Control communication module dual power supply circuit and power supply method of energy storage inverter system

Abstract

The application discloses a control communication module dual-power supply circuit and a power supply method of an energy storage inverter system. When the main power supply is powered, the first grounding switch and the active element are turned on, the first power supply circuit supplies power to the control communication module, the active element is turned on to control the passive element to be turned on, the second grounding switch is turned on to be grounded, the voltage dividing grounding path divides and grounds to release pressure, and the auxiliary power supply controller is not powered on. When the auxiliary power supply is powered, the first grounding switch is turned off, the active element and the second grounding switch are turned off, the voltage dividing grounding path divides and grounds to power on the auxiliary power supply controller, and the second power supply circuit supplies power to the control communication module. The application can realize protection of the control communication module through the isolation module, meet the switching power supply demand of the main power supply and the auxiliary power supply, and prevent the battery pack from being damaged due to lack of power. The application does not need to arrange and control multiple groups of relay switching power supplies, saves interface resources, reduces the cost of relays, and effectively guarantees the service life.

Description

TECHNICAL FIELD

[0001] The application relates to a dual-power supply circuit and a power supply method for a control communication module of a storage energy inverter system, and belongs to the technical field of power supply of a control communication module of a storage energy inverter. BACKGROUND

[0002] A grid-connected inverter is generally classified into a photovoltaic power generation grid-connected inverter, a wind power generation grid-connected inverter, a power equipment power generation grid-connected inverter and other power generation equipment power generation grid-connected inverter. The maximum feature of the grid-connected inverter is high system power and low cost.

[0003] The biggest difference between a storage energy grid-connected inverter and an ordinary grid-connected inverter is that a battery pack exists. Since the inverter and the battery pack need to keep communication uninterruptedly, the storage energy inverter system needs uninterrupted power supply, so that the discharge load of the battery pack is increased for a long time in rainy days or weak light conditions, which causes the battery pack to be out of power and damages lithium battery packs, thereby causing unnecessary loss.

[0004] In view of this situation, an auxiliary power supply for power supply of the control communication module is designed in the prior art. Since isolation control is needed, the conventional way is to switch multiple power supplies for system power supply by multiple relays in the storage energy inverter, which occupies DSP IO port resources, has high relay cost, short mechanical life, long mechanical contact action delay and other defects. SUMMARY

[0005] The application aims to solve the defects of the prior art, and proposes a dual-power supply circuit and a power supply method for a control communication module of a storage energy inverter system in view of the problems of occupying DSP IO port resources, high relay cost, short mechanical life, long mechanical contact action delay and other problems of a traditional auxiliary power supply.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0007] The dual-power supply circuit for the control communication module of the storage energy inverter system comprises an alternating current (AC) end, a main power supply, an auxiliary power supply and a control communication module, the auxiliary power supply is provided with an auxiliary power supply controller, the main power supply is connected with a direct current (DC) power supply end PV and a battery pack, an auxiliary power supply circuit is arranged between the AC-DC conversion module and the auxiliary power supply, a first power supply circuit is arranged between the main power supply and the control communication module, a second power supply circuit is arranged between the auxiliary power supply and the control communication module,

[0008] The isolation module is arranged between the first power supply circuit and the auxiliary power supply circuit, and comprises a first ground switch and an active element arranged on the first power supply circuit, and a passive element arranged on the auxiliary power supply circuit and in on-off cooperation with the active element.

[0009] When the main power supply is powered, the first ground switch and the active element are turned on, the first power supply circuit supplies power to the control communication module, the active element controls the passive element to be turned on, the second ground switch is turned on to ground, the voltage dividing ground path divides and discharges, and the auxiliary power supply controller is not powered on.

[0010] When the auxiliary power supply is powered, the first ground switch is turned off, the active element and the second ground switch are turned off, the voltage dividing ground path supplies power to the auxiliary power supply controller, and the second power supply circuit supplies power to the control communication module.

[0011] Preferably, the first power supply circuit comprises a first output line and a first ground line connected to the control communication module, and the first ground line is provided with a first ground terminal.

[0012] The second power supply circuit comprises a second output line and a second ground line connected to the control communication module, and the second ground line is in conductive connection with the first ground terminal.

[0013] The first output line is provided with a first output branch connected to the active element, and the first output branch passes through the active element and the first ground switch to connect to the first ground terminal.

[0014] The auxiliary power supply circuit comprises a second ground terminal and an auxiliary power supply circuit line connected to the passive element, and the auxiliary power supply controller is connected to the auxiliary power supply circuit line through the voltage dividing ground path and connected to the second ground terminal through the second ground switch.

[0015] Preferably, the control communication module is in controlled connection with the first ground switch.

[0016] Preferably, the first ground switch is a transistor Q1, and the second ground switch is a transistor Q2.

[0017] The base of the transistor Q1 is connected to the control communication module, the emitter is connected to the first ground terminal, and the collector is connected to the active element.

[0018] The base of the triode Q2 is connected with the passive element, the emitter is connected with the second ground terminal, and the collector is connected with the auxiliary power supply controller.

[0019] Preferably, the base of the triode Q1 is provided with a resistor R1 on the connection path of the control communication module,

[0020] The voltage division ground path comprises a resistor R7 and a resistor R8 connected in series, the resistor R8 is connected with the second ground terminal, and the connection path of the resistor R7 and the resistor R8 is connected with the auxiliary power supply controller,

[0021] The base of the triode Q2 is connected with the passive element through a resistor R3, the passive element is connected with the second ground terminal through a resistor R6, and a resistor R5 is arranged on the connection path of the resistor R7 and the passive element.

[0022] Preferably, the isolation module is an optical coupler with a primary side and a secondary side, the primary side is the active element, and the secondary side is the passive element.

[0023] The application also provides a power supply method of the control communication module dual-power supply circuit of the energy storage inverter system,

[0024] A detection threshold of the DC power supply terminal PV is set,

[0025] When the DC power supply terminal PV detects higher than the detection threshold, the main power supply is selected, the first ground switch is turned on, and the first power supply circuit works;

[0026] When the DC power supply terminal PV detects not higher than the detection threshold, the auxiliary power supply is selected, the first ground switch is turned off, and the second power supply circuit works.

[0027] The beneficial effects of the application mainly include:

[0028] 1. The control communication module protection can be realized through the isolation module, the power supply switching demand of the main power supply and the auxiliary power supply is met, and the battery pack is prevented from being damaged due to lack of power.

[0029] 2. Multiple groups of relay switching power supply arrangements and controls are not needed, the interface resources are saved, the relay cost is reduced, and the effective service life is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0031] Figure 1 is a schematic diagram of the control communication module dual-power supply circuit of the energy storage inverter system. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, but not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the convenience of description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] The present application provides a control communication module dual power supply circuit of energy storage inverter system, as shown in Figure 1 The energy storage inverter system includes an alternating current (AC) end, a main power supply, an auxiliary power supply, a control communication module, and an auxiliary power supply controller. The main power supply is connected with a direct current (DC) power supply end PV and a battery pack. The AC end is provided with an auxiliary power supply circuit 3 between the AC-DC conversion module and the auxiliary power supply. The main power supply is provided with a first power supply circuit 1 between the main power supply and the control communication module. The auxiliary power supply is provided with a second power supply circuit 2 between the auxiliary power supply and the control communication module.

[0035] In the conventional circuit, a relay is arranged on the first power supply circuit and the second power supply circuit for shutdown control. The relay has a high cost and occupies a large space.

[0036] In view of this, as shown in Figure 1 An isolation module 4 is arranged between the first power supply circuit 1 and the auxiliary power supply circuit 3. The isolation module 4 includes a first ground switch and an active element arranged on the first power supply circuit, and a passive element arranged on the auxiliary power supply circuit and cooperating with the active element in on-off. Two ends of the passive element are respectively provided with a voltage division ground path and an on-off ground path between the passive element and the auxiliary power supply controller. The on-off ground path is provided with a second ground switch, and the passive element is in controlled connection with the second ground switch.

[0037] When the main power supply is powered, the first ground switch and the active element are turned on, the first power supply circuit supplies power to the control communication module, the active element is turned on to control the passive element to be turned on, the second ground switch is turned on to ground, the voltage division ground path divides and grounds to release pressure, and the auxiliary power supply controller is not powered on.

[0038] When the auxiliary power supply is powered, the first ground switch is turned off, the active element and the second ground switch are turned off, the voltage division ground path divides and powers on the auxiliary power supply controller, and the second power supply circuit supplies power to the control communication module.

[0039] Specifically, the control communication module is powered by AC, main power supply and auxiliary power supply when it is working. When the DC power supply end PV has continuous power supply, the control communication module is powered by the DC power supply end PV to complete frequent interactive communication. In the traditional system, when the DC power supply end PV is insufficient, the battery pack is switched to supply power. When the DC power supply end PV is in a long-term power supply shortage, the battery pack will be damaged due to lack of power.

[0040] In this case, when the DC power supply end PV is insufficient, the auxiliary power supply is switched to supply power, so that the battery pack is protected. The traditional way is to use a relay to control the on-off of the first power supply circuit and the second power supply circuit.

[0041] In this case, the control communication module will collect information from the DC power supply end PV in the power-on state. Generally, the default state is powered by the main power supply. At this time, the first ground switch and the active element are turned on, the first power supply circuit supplies power to the control communication module, the active element is turned on to control the passive element to be turned on, the second ground switch is turned on to ground, the voltage dividing ground circuit is divided to ground to release pressure, and the auxiliary power supply controller is not powered on.

[0042] The main power supply is generally a BUS bus, and the AC end, the DC power supply end PV and the battery pack can all be powered on to meet the power supply needs of the control communication module. When the DC power supply end PV does not meet the power supply needs, the battery pack is generally switched. In this case, when it is detected that the DC power supply end PV is insufficient, the auxiliary power supply is switched to supply power, the first ground switch is turned off, the active element and the second ground switch are turned off, the voltage dividing ground circuit is divided to power on the auxiliary power supply controller, and the second power supply circuit supplies power to the control communication module.

[0043] In one specific embodiment, as shown in Figure 1 The first power supply circuit includes a first output line and a first ground line connected to the control communication module for power supply, and the first ground line is provided with a first ground terminal 5. The second power supply circuit includes a second output line and a second ground line connected to the control communication module for power supply, and the second ground line is in conductive connection with the first ground terminal.

[0044] The first output line is provided with a first output branch connected to the active element, and the first output branch passes through the active element and the first ground switch to access the first ground terminal 5.

[0045] The auxiliary power supply circuit includes a second ground terminal and an auxiliary power supply circuit line connected to the passive element. The auxiliary power supply controller is connected to the auxiliary power supply circuit line through a voltage dividing ground circuit in one way and connected to the second ground terminal 6 through the second ground switch in the other way. The voltage dividing ground circuit is connected to the second ground terminal. The control communication module is connected to the first ground switch for control.

[0046] Specifically, the traditional first power supply circuit and the second power supply circuit have a common ground terminal, and when the power supply circuit is switched, there is a short circuit and the like, which is easy to cause damage to the control communication module DSP.

[0047] In view of this, the first power supply circuit and the second power supply circuit are respectively grounded, and the first output branch and the auxiliary power supply circuit line pass through the isolation module 4 and are respectively grounded, so that the first power supply circuit and the second power supply circuit operate safely and do not cause damage to the DSP.

[0048] In one embodiment, as shown in Figure 1 , the first grounding switch is a triode Q1, the second grounding switch is a triode Q2, the base of the triode Q1 is connected to the control communication module, the emitter is connected to the first grounding terminal, and the collector is connected to the active element, the base of the triode Q2 is connected to the passive element, the emitter is connected to the second grounding terminal, and the collector is connected to the auxiliary power supply controller.

[0049] Specifically, the traditional relay has a communication interface control, and in the present case, a double switching of triodes is adopted, and only the enable signal of Q1 can meet the switching control requirement, saving the IO interface resource.

[0050] In one embodiment, as shown in Figure 1 , a resistor R1 is arranged on the connection path of the base of the triode Q1 and the control communication module, a voltage dividing grounding path includes a resistor R7 and a resistor R8 connected in series, the resistor R8 is connected to the second grounding terminal, the connection path of the resistor R7 and the resistor R8 is connected to the auxiliary power supply controller, the base of the triode Q2 is connected to the passive element through a resistor R3, the passive element is connected to the second grounding terminal through a resistor R6, and a resistor R5 is arranged on the connection path of the resistor R7 and the passive element.

[0051] In addition, a resistor R2 is arranged in parallel between the base and the emitter of the triode Q1, a resistor R4 is arranged in parallel between the base and the emitter of the triode Q2, a resistor R10 is arranged on the connection path of the collector of the triode Q2 and the auxiliary power supply controller, and a resistor R9 is arranged on the first output branch.

[0052] In this way, the stable operation requirement of each electronic component is met. In addition, a diode D1 is arranged on the output path of the first power supply circuit, and a diode D2 is arranged on the output path of the second power supply circuit, the diode D1 and the diode D2 meet the one-way conduction requirement, and maintain the stable operation requirement of the first power supply circuit and the second power supply circuit.

[0053] In one specific embodiment, the isolation module is an optical coupling S1 with a primary side and a secondary side, the primary side being the active element and the secondary side being the passive element. That is, after the secondary side is powered, the light emitting diode emits light to make the photoelectric sensor realize the on-off response. Of course, other isolation modules can also be used, such as transformer isolation, capacitor isolation, RF isolation, etc., as long as the module design meets the requirement of the switching association of the first power supply circuit and the second power supply circuit being isolated, which is within the protection scope of the present application.

[0054] The power supply method of the control communication module dual power supply circuit of the energy storage inverter system of the present application is described as follows:

[0055] The detection threshold of the DC power supply end PV is set.

[0056] When the DC power supply end PV detection is higher than the detection threshold, the main power supply is selected, the control communication module sends an enable signal to Q1 through the first output branch via R1, at this time Q1 is opened, S1 is opened, Q2 is opened, R7 and R8 are divided to discharge, and the first power supply circuit is operated.

[0057] When the DC power supply end PV detection is not higher than the detection threshold, the auxiliary power supply is selected, Q1 is closed, S1 is closed, Q2 is closed, and the second power supply circuit is operated.

[0058] That is, the control communication module will continuously communicate with each power supply end and judge the state, and when the PV supply is insufficient, the corresponding auxiliary power supply switching is performed.

[0059] As can be seen from the above description, the control communication module protection can be realized by the isolation module, the main power supply and auxiliary power supply switching power supply requirements are met, and the battery pack is prevented from being damaged due to lack of power. Without multiple relay switching power supply arrangement and control, interface resources are saved, relay cost is reduced, and effective service life is guaranteed.

[0060] The term "comprising" or any other similar word is intended to encompass non-exclusive inclusion, so that a process, method, article or device / apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to the process, method, article or device / apparatus.

[0061] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A control communication module dual power supply circuit of a storage inverter system, the storage inverter system comprising an alternating current (AC) end, a main power supply, an auxiliary power supply, a control communication module, the auxiliary power supply being provided with an auxiliary power supply controller, the main power supply being connected with a direct current (DC) power supply end PV and a battery pack, the AC end being provided with an auxiliary power supply circuit between the AC-DC conversion module and the auxiliary power supply, a first power supply circuit being provided between the main power supply and the control communication module, and a second power supply circuit being provided between the auxiliary power supply and the control communication module, characterized in that: an isolation module is provided between the first power supply circuit and the auxiliary power supply circuit, the isolation module comprising a first ground switch and an active element provided on the first power supply circuit, and a passive element provided on the auxiliary power supply circuit and cooperating with the active element, two ends of the passive element being respectively provided with a voltage division ground path and a on-off ground path between the passive element and the auxiliary power supply controller, the on-off ground path being provided with a second ground switch, and the passive element being in controlled connection with the second ground switch. When the main power supply is powered, the first ground switch and the active element are turned on, the first power supply circuit supplies power to the control communication module, the active element controls the passive element to be turned on, the second ground switch is turned on to ground, the voltage division ground path is divided to ground to release pressure, and the auxiliary power supply controller is not powered on. When the auxiliary power supply is powered, the first ground switch is turned off, the active element and the second ground switch are turned off, the voltage division ground path divides the voltage to power on the auxiliary power supply controller, and the second power supply circuit supplies power to the control communication module. 2.The control communication module dual power supply circuit of the storage inverter system according to claim 1, characterized in that: the first power supply circuit comprises a first output line and a first ground line in power supply connection with the control communication module, and the first ground line is provided with a first ground end. The second power supply circuit comprises a second output line and a second ground line in power supply connection with the control communication module, and the second ground line is in conductive connection with the first ground end. The first output line is provided with a first output branch connected with the active element, and the first output branch is connected to the first ground end through the active element and the first ground switch. The auxiliary power supply circuit comprises a second ground end and an auxiliary power supply circuit line connected with the passive element, the auxiliary power supply controller is connected with the auxiliary power supply circuit line through the voltage division ground path in one way and connected to the second ground end through the second ground switch in another way, and the voltage division path of the voltage division ground path is connected with the second ground end. 3.The control communication module dual power supply circuit of the storage inverter system according to claim 2, characterized in that: the control communication module is in controlled connection with the first ground switch. 4.The control communication module dual power supply circuit of the storage inverter system according to claim 3, characterized in that: the first ground switch is a triode Q1, and the second ground switch is a triode Q2. ​ ​ ​ ​ The base of the triode Q1 is connected with the control communication module, the emitter is connected with the first ground terminal, and the collector is connected with the active element, The base of the triode Q2 is connected with the passive element, the emitter is connected with the second ground terminal, and the collector is connected with the auxiliary power supply controller.

5. The control communication module dual power supply circuit of the energy storage inverter system according to claim 4, characterized in that: The base of the triode Q1 is connected with the control communication module, the emitter is connected with the first ground terminal, and the collector is connected with the active element, The voltage dividing ground circuit comprises a resistor R7 and a resistor R8 connected in series, the resistor R8 is connected with the second ground terminal, and the connection path of the resistor R7 and the resistor R8 is connected with the auxiliary power supply controller, The base of the triode Q2 is connected with the passive element through a resistor R3, the passive element is connected with the second ground terminal through a resistor R6, and a resistor R5 is arranged on the connection path of the resistor R7 and the passive element.

6. The control communication module dual power supply circuit of the energy storage inverter system according to claim 1, characterized in that: The isolation module is an optocoupler with a primary side and a secondary side, the primary side is the active element, and the secondary side is the passive element.

7. The power supply method of the control communication module dual power supply circuit of the energy storage inverter system according to any one of claims 1 to 6, characterized in that: A detection threshold of the direct current power supply terminal PV is set, When the detection of the direct current power supply terminal PV is higher than the detection threshold, the main power supply is selected, the first ground switch is turned on, and the first power supply circuit works; When the detection of the direct current power supply terminal PV is not higher than the detection threshold, the auxiliary power supply is selected, the first ground switch is turned off, and the second power supply circuit works.

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