Switching power supply switching device, switching power supply switching system and switching power supply switching equipment

Abstract

The utility model provides a switching power supply switching device, system and equipment, and relates to the field of power supplies. The switching device comprises a voltage division circuit, a comparator, a first switching circuit, a second switching circuit, a third switching circuit and a fourth switching circuit, and under the condition that the comparator outputs a first level signal, the fourth switching circuit, the third switching circuit and the second switching circuit are switched on, and the first switching circuit is switched off; and under the condition that the comparator outputs the second level signal, the fourth switching circuit, the third switching circuit and the second switching circuit are switched off, and the first switching circuit is switched on. According to the utility model, self-adaptive switching of the switching power supply can be realized through one switching power supply switching device, so that the damage risk in the test process of the energy storage converter is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, in particular to a switching power supply switching device, system and equipment. Background Technique

[0002] In the test of energy storage converters, AC switching power supplies are often used. Its input is 220VAC and the output is 24VDC. There are certain usage conditions for the conversion from 220VAC to 24VDC. In the conventional design, the AC switching power supply takes power input from the single-phase and the neutral line. However, in the actual pulse test of the energy storage converter and the test with an input lower than 220V, the internal switching power supply cannot supply 24V voltage, and the controller main board of the energy storage converter cannot operate normally.

[0003] In the weak current test and the test with an input lower than 220VAC, in order to make the controller main board of the energy storage converter operate normally, the energy storage converter needs to be externally connected with a switching power supply. After the work such as pulse, protection delay, and drive board test is completed, if the energy storage converter does not switch back to the no-load test with the internal switching power supply, it will still be in the bus closing state after the grid side is disconnected. If the set values of the bus voltages of the two groups of no-load test data differ greatly, a voltage impact will be generated at the moment of AC input, greatly increasing the risk of damage to the devices and modules of the energy storage converter. If the test personnel lack operation experience and use an external switching power supply for the load test, the risk of equipment damage will be further increased.

[0004] Therefore, the energy storage converter needs to use different switching power supplies under different circumstances and needs to switch the switching power supply. Summary of the Invention

[0005] One technical problem to be solved by the utility model is to provide a switching power supply switching device, system and equipment method that can adaptively switch the switching power supply.

[0006] According to one aspect of the present utility model, a switching power supply switching device is provided, comprising: a voltage dividing circuit; a comparator, the first input terminal of the comparator is electrically connected to the first terminal, the second input terminal of the comparator is electrically connected to the second terminal through the voltage dividing circuit, the first terminal is configured to be connected to the positive electrode of the first switching power supply, and the second terminal is configured to be connected to the positive electrode of the second switching power supply; a first switching circuit, the first end of the first switching circuit is electrically connected to the first terminal, the second end of the first switching circuit is electrically connected to the third terminal, and the third terminal is configured to be connected to the first end of the controller of the energy storage inverter, wherein the second end of the controller is electrically connected to the fourth terminal, and the fourth terminal is configured to be connected to the negative electrodes of the first switching power supply and the second switching power supply; a second switching circuit, the first end of the second switching circuit is electrically connected to the control terminal of the first switching circuit, the second end of the second switching circuit is electrically connected to the ground terminal, and the control terminal of the second switching circuit is electrically connected to the output terminal of the comparator and the third terminal; a third switching circuit, the first end of the third switching circuit is electrically connected to the second terminal, the second end of the third switching circuit is electrically connected to the output terminal of the comparator and the third terminal; a fourth switching circuit, the first end of the fourth switching circuit is electrically connected to the control terminal of the third switching circuit, the second end of the fourth switching circuit is electrically connected to the ground terminal, and the control terminal of the fourth switching circuit is electrically connected to the output terminal of the comparator, wherein, when the comparator outputs a first level signal, the fourth switching circuit, the third switching circuit and the second switching circuit are turned on, and the first switching circuit is turned off; when the comparator outputs a second level signal, the fourth switching circuit, the third switching circuit and the second switching circuit are turned off, and the first switching circuit is turned on.

[0007] This embodiment does not require adding multiple switching devices to achieve the adaptive switching of the switching power supply, saving the switching cost and component cost.

[0008] In some embodiments, the first input terminal is the inverting input terminal, the second input terminal is the non-inverting input terminal, the first level signal is greater than the second level signal, the first switching circuit includes a first N-type metal-oxide-semiconductor (NMOS) transistor, the second switching circuit includes a second NMOS transistor, the first end and the control terminal of the first switching circuit are electrically connected, the third switching circuit includes a P-type metal-oxide-semiconductor (PMOS) transistor and a first resistor, wherein the first resistor is disposed between the first end and the control terminal of the third switching circuit, and the fourth switching circuit includes a fourth NMOS transistor.

[0009] In this embodiment, the circuit itself's special effects and voltage differences are used for comparison and switching. Without adding the code and chips for program control, the adaptive switching of the switching power supply can be achieved, saving manpower, time and R & D costs. In addition, by using the hardware circuit composed of PMOS transistors, NMOS transistors and comparators to realize the switching of the switching power supply, it has the characteristics of low loss and high conversion efficiency.

[0010] In some embodiments, the switching power supply switching device further includes: a first diode, the positive electrode of the first diode is electrically connected to the control end of the fourth switching circuit, and the negative electrode of the first diode is electrically connected to the second end of the third switching circuit.

[0011] This embodiment can reduce the conduction of the third switching circuit, so as to reduce the influence of the voltage at the second end of the third switching circuit on the level output by the comparator, and avoid mutual interference between the two.

[0012] In some embodiments, the switching power supply switching device further includes: a second diode, the positive electrode of the second diode is electrically connected to the second end of the third switching circuit, and the negative electrode of the second diode is electrically connected to the third terminal.

[0013] This embodiment can reduce the conduction of the first switching circuit, so as to reduce the influence of the voltage at the second end of the first switching circuit on the voltage at the second end of the third switching circuit, and improve the execution ability of the entire switching power supply switching device.

[0014] In some embodiments, the first switching circuit further includes a second resistor, wherein the second resistor is arranged between the first end and the control end of the first switching circuit.

[0015] This embodiment can reduce the interference of the ground on the first switching power supply.

[0016] In some embodiments, the voltage dividing circuit is a third diode, the positive electrode of the third diode is electrically connected to the second terminal, and the negative electrode of the third diode is electrically connected to the second input terminal of the comparator.

[0017] This embodiment does not need to consider the resistance value, making the setting of the switching power supply switching device more convenient and easier to implement.

[0018] In some embodiments, the switching power supply switching device further includes: a control unit, arranged between the output end of the comparator and the second end of the fourth switching circuit, and configured to control the on-off of the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit according to the level signal output by the comparator.

[0019] This embodiment makes the selection range of the switching circuit wider.

[0020] According to another aspect of the present invention, a switching power supply switching system is further provided, including: the above-mentioned switching power supply switching device; and an energy storage inverter, the controller of the energy storage inverter is configured to supply power by using the first switching power supply or the second switching power supply through the switching power supply switching device.

[0021] According to another aspect of the present invention, an electrical equipment is further provided, including: the above-mentioned switching power supply switching system.

[0022] Other features and advantages of the present utility model will become clear from the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0023] The drawings forming a part of the specification depict embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0024] With reference to the accompanying drawings, the present utility model can be more clearly understood from the following detailed description, wherein:

[0025] Figure 1 are schematic structural diagrams of some embodiments of the switching power supply switching device of the present utility model;

[0026] Figure 2 are schematic structural diagrams of other embodiments of the switching power supply switching device of the present utility model;

[0027] Figure 3 are schematic structural diagrams of other embodiments of the switching power supply switching device of the present utility model;

[0028] Figure 4 are schematic flow diagrams of some embodiments of the power supply method of the energy storage converter of the present utility model;

[0029] Figure 5 are schematic flow diagrams of other embodiments of the power supply method of the energy storage converter of the present utility model. Detailed Embodiments

[0030] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0031] At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation on the present utility model or its application or use.

[0033] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be regarded as part of the description.

[0034] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters indicate like items in the following figures, and thus, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0037] In order to reduce the possibility of accidents caused by insufficient personnel operation experience, the present utility model provides a switching power supply switching device, which can realize the adaptive switching of the power supply end of the master controller of the energy storage converter.

[0038] Figure 1 FIG. is a schematic structural diagram of some embodiments of the switching power supply switching device of the present utility model. The switching power supply switching device includes a voltage dividing circuit 1, a comparator 2, a first switching circuit 3, a second switching circuit 4, a third switching circuit 5 and a fourth switching circuit 6.

[0039] The voltage dividing circuit 1 functions to divide the voltage, such as a voltage dividing diode or a voltage dividing resistor. By setting the voltage dividing circuit, the switching power supply switching device can make the voltage input to the first input terminal of the comparator greater than the voltage input to the second input terminal when the voltages of the first switching power supply and the second switching power supply are the same.

[0040] In some embodiments, the voltage dividing circuit 1 is implemented by a diode. For example, as Figure 3 shown by the third diode D1. On the one hand, the diode functions to divide the voltage, so that when the voltages of the first switching power supply and the second switching power supply are the same, the voltage input to the first input terminal of the comparator is greater than the voltage input to the second input terminal. On the other hand, the diode can achieve an anti-reverse effect through its one-way conduction function, and compared with the implementation of the voltage dividing circuit by a resistor, this embodiment does not need to consider the resistance value, making the setting of the switching power supply switching device more convenient and easier to implement.

[0041] The comparator 2 includes a first input terminal, a second input terminal and an output terminal. The first input terminal is electrically connected to the first terminal T1, the second input terminal is electrically connected to the second terminal T2 through the voltage dividing circuit 1, the first terminal T1 is configured to connect to the positive pole of the first switching power supply, and the second terminal T2 is configured to connect to the positive pole of the second switching power supply. The voltage output by the first switching power supply is less than or equal to the voltage output by the second switching power supply. The voltage signal output by the second switching power supply is a stable signal, which can meet the normal operation of the energy storage converter.

[0042] The first input terminal of the comparator 2 is, for example, an inverting input terminal, and the second input terminal is, for example, a non-inverting input terminal. The output terminal outputs a corresponding level signal according to the signals input to the inverting input terminal and the non-inverting input terminal. For example, if the voltage signal input to the inverting input terminal is less than the voltage signal input to the non-inverting input terminal, the output terminal of the comparator outputs a high-level signal. If the voltage signal input to the inverting input terminal is greater than the voltage signal input to the non-inverting input terminal, the output terminal of the comparator outputs a low-level signal.

[0043] In some embodiments, one of the first switching power supply and the second switching power supply is an internal switching power supply, and the other is an external switching power supply. The internal switching power supply takes power from the C phase and the neutral line N on the AC side and outputs a voltage of 24 VDC or less than 24 VDC. The external switching power supply outputs a voltage of 24 VDC.

[0044] The first end of the first switching circuit 3 is electrically connected to the first terminal T1, the second end of the first switching circuit 3 is electrically connected to the third terminal T3, and the third terminal T3 is configured to be connected to the first end of the controller of the energy storage converter. Wherein, the second end of the controller is electrically connected to the fourth terminal T4, and the fourth terminal T4 is configured to be connected to the negative poles of the first switching power supply and the second switching power supply.

[0045] The first end of the second switching circuit 4 is electrically connected to the control end of the first switching circuit 3, the second end of the second switching circuit 4 is electrically connected to the ground terminal GND, and the control end of the second switching circuit 4 is electrically connected to the output terminal of the comparator 2 and the third terminal T3.

[0046] The first end of the third switching circuit 5 is electrically connected to the second terminal T2, and the second end of the third switching circuit 5 is electrically connected to the output terminal of the comparator 2 and the third terminal T3.

[0047] The first end of the fourth switching circuit 6 is electrically connected to the control end of the third switching circuit 5, the second end of the fourth switching circuit 6 is electrically connected to the ground terminal GND, and the control end of the fourth switching circuit 6 is electrically connected to the second end of the third switching circuit 5 and the output terminal of the comparator 2.

[0048] In some embodiments, if the fourth switching circuit 6 is not provided, the third switching circuit 5 is directly grounded. Due to the interference of the ground clutter, it may interfere with the on / off of the switch. For example, in the link where the controller of the energy storage converter needs to be powered by the first switching circuit, due to the ground interference, the third switching circuit is turned on, resulting in a failure of the entire circuit. In this embodiment, by adding the fourth switching circuit, the third switching circuit is not directly grounded, which can effectively reduce the interference of the ground clutter on the on / off of the third switching circuit and improve the safety of the entire circuit.

[0049] When the comparator 2 outputs a first level signal, the fourth switch circuit 6, the third switch circuit 5 and the second switch circuit 4 are turned on, and the first switch circuit 3 is turned off; when the comparator 2 outputs a second level signal, the fourth switch circuit 6, the third switch circuit 5 and the second switch circuit 4 are turned off, and the first switch circuit 3 is turned on. The states of the first level signal and the second level signal are opposite. For example, the first level signal is a high level signal and the second level signal is a low level signal; or the first level signal is a low level signal and the second level signal is a high level signal.

[0050] In this embodiment, the voltage output by the second switching power supply is divided by a voltage dividing circuit and input to the comparator, and the voltage output by the first switching power supply is directly input to the comparator. According to the level signal output by the comparator, it can be determined whether the voltage output by the first switching power supply is less than the voltage output by the second switching power supply. When the fourth switch circuit, the third switch circuit and the second switch circuit are turned on and the first switch circuit is turned off, the second switching power supply supplies power to the controller of the energy storage converter; when the fourth switch circuit, the third switch circuit and the second switch circuit are turned off and the first switch circuit is turned on, the first switching power supply supplies power to the controller of the energy storage converter. This switching power supply switching device uses a voltage dividing circuit, a comparator and three switch circuits, and does not need to add multiple switching devices to achieve the adaptive switching of the switching power supply, saving the switching cost and the component cost.

[0051] In some embodiments of the present invention, as Figure 2 shown, the switching power supply switching device further includes a first diode 7. The positive electrode of the first diode 7 is electrically connected to the control end of the fourth switch circuit 6, and the negative electrode of the first diode 7 is electrically connected to the second end of the third switch circuit 5.

[0052] By setting the first diode, since the diode has the function of reverse cut-off, it can reduce the conduction of the third switch circuit, reduce the influence of the voltage at the second end of the third switch circuit on the level output by the comparator, and avoid mutual interference between the two.

[0053] In other embodiments, as Figure 2 shown, the switching power supply switching device further includes a second diode 8. The positive electrode of the second diode 8 is electrically connected to the second end of the third switch circuit 5, and the negative electrode of the second diode 8 is electrically connected to the third terminal T3.

[0054] By setting the second diode, since the diode has the function of reverse cut-off, it can reduce the conduction of the first switch circuit, reduce the influence of the voltage at the second end of the first switch circuit on the voltage at the second end of the third switch circuit, and improve the execution ability of the entire switching power supply switching device.

[0055] In some embodiments of the present utility model, the first input terminal is an inverting input terminal, the second input terminal is a non-inverting input terminal, the first level signal is greater than the second level signal, the first switching circuit includes a first NMOS (N-Metal-Oxide-Semiconductor) transistor, the second switching circuit includes a second NMOS transistor, the first end and the control end of the first switching circuit are electrically connected, the third switching circuit includes a PMOS (P-Metal-Oxide-Semiconductor) transistor and a first resistor, wherein the first resistor is disposed between the first end and the control end of the third switching circuit, and the fourth switching circuit includes a fourth NMOS transistor.

[0056] For example, as Figure 3 shown, Figure 3 is a schematic structural diagram of some other embodiments of the switching power supply switching device of the present utility model.

[0057] The first switching circuit 3 is a first NMOS transistor N1. The first end of the first NMOS transistor N1 is a drain D1, which is electrically connected to the first terminal T1; the second end of the first NMOS transistor N1 is a source S1, which is electrically connected to the third terminal T3; the control end of the first NMOS transistor N1 is a gate G1. Among them, the gate G1 of the first NMOS transistor N1 is electrically connected to the drain D1 to satisfy the self-characteristics of the NMOS transistor.

[0058] The second switching circuit 4 is a second NMOS transistor N2. The first end of the second NMOS transistor N2 is a drain D2, which is electrically connected to the gate G2 of the first NMOS transistor N1; the second end of the second NMOS transistor N2 is a source S2, which is electrically connected to the ground terminal GND; the control end of the second NMOS transistor N2 is a gate G2, which is electrically connected to the output end of the comparator 2.

[0059] The third switching circuit 5 includes a PMOS transistor P1 and a first resistor R1. The first end of the PMOS transistor P1 is a drain D3, which is electrically connected to the second terminal T2; the second end of the PMOS transistor P1 is a source S3, which is electrically connected to the output end of the comparator 2, the gate G2 of the second NMOS transistor N2, and the third terminal T3; the control end of the PMOS transistor P1 is a gate G3, which is electrically connected to the first end of the fourth switching circuit 6. One end of the first resistor R1 is electrically connected to the drain D3 of the PMOS transistor P1, and the other end is electrically connected to the gate G3 of the PMOS transistor P1.

[0060] If the value of the first resistor R1 is too large or too small, it will affect the PMOS transistor P1. The value of the first resistor R1 needs to ensure that the drain and gate voltages of the transistor meet the design requirements of the PMOS transistor. The actual value needs to be determined during the test work.

[0061] For example, the Vgd of the PMOS transistor P1 can be negative or 0. Then, the resistance value of the first resistor R1 here ensures that after voltage division, the PMOS transistor P1 satisfies Vgd ≤ 0. At the same time, to ensure the operating logic of the topology circuit, the Vgd of the PMOS transistor P1 after voltage division by the first resistor R1 must also satisfy being greater than the low level output by the comparator. Therefore, the voltage division range of the first resistor R1 from 1 to 20V can meet the above conditions.

[0062] The fourth switch circuit 6 is the third NMOS transistor N3. The first end of the third NMOS transistor N3 is the drain D4, which is electrically connected to the gate G3 of the PMOS transistor P1; the second end of the third NMOS transistor N3 is the source S4, which is electrically connected to the ground terminal; the control end of the third NMOS transistor N3 is the gate G4, which is electrically connected to the source S3 of the PMOS transistor P1.

[0063] A third diode D1 is provided before the non-inverting input terminal of the comparator 2. The positive electrode of the third diode D1 is electrically connected to the second terminal T2, and the negative electrode of the third diode D1 is electrically connected to the non-inverting input terminal of the comparator 2. The inverting input terminal of the comparator 2 is electrically connected to the first terminal T1. The first terminal T1 is electrically connected to the positive electrode of the first switching power supply POWER1, and the second terminal T2 is electrically connected to the negative electrode of the second switching power supply POWER2. The negative electrodes of the first switching power supply POWER1 and the second switching power supply POWER2 are electrically connected to the fourth terminal T3.

[0064] If the first switching power supply POWER1 is an internal switching power supply and the second switching power supply POWER2 is an external switching power supply, the output of the external switching power supply is 24VDC. When the power supply voltage on the AC side is less than 220VAC, the output of the internal switching power supply is also less than 24VDC. Generally, the test point input from weak electricity to strong electricity will be in the order of 24VAC, 80VAC, 120VAC, 220VAC. There may be situations of output undervoltage and overcurrent when the input of the switching power supply is between 180 and 220VAC. However, the test input voltage is generally separated by dozens of volts. By setting the third diode D1 at the second input terminal of the comparator 2, the voltage input to the first input terminal of the comparator 2 is made less than the voltage input to the second input terminal. At this time, the comparator outputs a high level.

[0065] The high-level signal is input to the gate of the third NMOS transistor N3. Since the source of the third NMOS transistor N3 is grounded, the Vgs of the third NMOS transistor N3 is greater than 0, and the third NMOS transistor N3 is turned on. The conduction of the third NMOS transistor N3 causes the gate voltage of the PMOS transistor P1 to be lower than the high level of the source voltage. Therefore, the Vgs of the PMOS transistor P1 is less than 0, and at this time, the PMOS transistor P1 is turned on. The gate of the second NMOS transistor N2 is at a high level, and the source is electrically connected to the ground terminal. Therefore, the Vgs of the second NMOS transistor N2 is greater than 0, and at this time, the second NMOS transistor N2 is turned on. The conduction of the second NMOS transistor N2 causes the first NMOS transistor N1 to be grounded at a low voltage, and the source of the first NMOS transistor is connected to a high level. Therefore, the Vgs of the first NMOS transistor is less than 0, and the first NMOS transistor is not turned on. The third terminal T3 is connected to the positive pole of the controller AP1, and the fourth terminal T4 is connected to the negative pole of the controller AP1, as well as the negative poles of the internal switching power supply POWER1 and the external switching power supply POWER2. Since the positive pole of the external switching power supply is conducted with the positive pole of the main board of the controller AP1, the controller is powered by the external switching power supply.

[0066] If the supply voltage on the AC side is 220VAC, the output of the internal switching power supply is 24VDC. Since the third diode D1 is provided at the second input terminal of the comparator 2, the voltage input to the first input terminal of the comparator 2 is greater than the voltage input to the second input terminal. At this time, the comparator outputs a low level.

[0067] The low-level signal is input to the gate of the third NMOS transistor N3. Since the source of the third NMOS transistor N3 is grounded, the Vgs of the third NMOS transistor N3 is less than 0, and the third NMOS transistor N3 is not turned on. The Vgs of the PMOS transistor P1 is greater than 0, and at this time, the PMOS transistor P1 is also not turned on. The gate of the second NMOS transistor N2 is at a low level, and the source is electrically connected to the ground terminal. Therefore, the Vgs of the second NMOS transistor N2 is less than 0, and at this time, the second NMOS transistor N2 is not turned on. The voltage of the gate of the first NMOS transistor N1 is lower than the drain voltage but higher than the source voltage. Therefore, the Vgs of the first NMOS transistor is greater than 0, and the first NMOS transistor is turned on. Since the positive pole of the internal switching power supply is conducted with the positive pole of the main board of the controller AP1, the controller is powered by the internal switching power supply.

[0068] Through the above embodiments, by using one PMOS transistor, three NMOS transistors, one comparator and a voltage dividing circuit, it is possible to achieve that when the internal switching power supply fails to supply power at a predetermined voltage, the external switching power supply supplies power, and when the internal switching power supply supplies power at the predetermined voltage, the internal switching power supply supplies power. There is no need for manual switching or adding multiple connectors. By using the special effects of the circuit itself and the voltage difference for comparison and switching, there is no need to add program control code and chips, and the adaptive switching of the switching power supply can be realized, saving manpower, time and R & D costs. In addition, by using a hardware circuit composed of a PMOS transistor, an NMOS transistor and a comparator to realize the switching of the switching power supply, it has the characteristics of low loss and high conversion efficiency.

[0069] Furthermore, the AC relay of some energy storage converters will still be in the closed state after being turned off, and the DC relay will not disconnect until the bus voltage drops to dozens of volts. After the device stops running, the external switching power supply still supplies power to components such as the small fan on the controller main board. There is no sampling device, so it is impossible to provide a feedback signal for the program on the controller main board to detect the closing state of the relay. At this time, if the upper computer sets a value with a large difference from the previous group of voltages and the AC side inputs immediately, the IGBT (Insulate-Gate Bipolar Transistor) module of the energy storage converter will immediately rectify and continue to output automatically, causing a large voltage impact. That is to say, using the external switching power supply for load testing will further increase the risk of equipment damage. In addition, there are usually more than one device tested in the laboratory, and the circuit breakers of the external switching power supply are often easily confused. In high-voltage testing, if the operator accidentally turns off the switching power supply of the running converter, it will cause the risk of equipment damage. Therefore, in this embodiment, both the internal and external switching power supplies are connected to the controller of the energy storage converter by the same switching power supply switching device to achieve adaptive switching, which can reduce the damage risk during the testing of the energy storage converter.

[0070] Furthermore, in most energy storage converter designs, the device will be in the standby state rather than the initial unclosed state after a successful start and stop. At this time, since the relay of the energy storage converter is still in the closed state, it will run immediately once a given input is provided. Generally, when passing through the internal switching power supply and its internal sampling device, the main board program will receive a feedback signal and automatically detect the closing state once and return to the initial state, requiring the start-up procedure to be operated again. This ensures the soft start in the main circuit of the device and will not cause a large impact and damage to components due to an instantaneous rise. Therefore, in this embodiment, both the internal and external switching power supplies are connected to the controller of the energy storage converter by the same switching power supply switching device to achieve adaptive switching, which can reduce the hidden danger of bus closing brought by the external switching power supply during testing.

[0071] In some embodiments, as Figure 3 shown, the first diode 7 is disposed between the source S3 of the PMOS transistor P1 and the gate G4 of the third NMOS transistor N3. When the comparator outputs a high-level signal, the third NMOS transistor N3 and the PMOS transistor P1 are turned on. At this time, the external switching power supply supplies power to the controller. By setting the first diode 7, since the diode has the function of reverse cut-off, the voltage output by the external switching power supply will not be input to the gate G4 of the third NMOS transistor N3, that is, the conduction of the PMOS transistor is reduced, so that the voltage output by it will not affect the hardware of the comparator output level, avoiding mutual interference between the two, thereby reducing the damage and miscontrol of the third NMOS transistor N3 and improving the accuracy of the switching power supply switching.

[0072] In some embodiments, as Figure 3 shown, the second diode 8 is disposed between the source S3 of the PMOS transistor P1 and the third terminal T3. When the comparator outputs a low level, the third NMOS transistor N3 and the PMOS transistor P1 are not turned on. The low-level signal is input to the gate of the second NMOS transistor N2, the second NMOS transistor N2 is not turned on, and the first NMOS transistor N1 is turned on, so that the voltage output by the internal switching power supply is input not only to the controller but also possibly to the source S2 of the PMOS transistor P1. By adding the second diode 8, since the diode has the function of reverse cut-off, the voltage output by the first switching power supply will not be input to the source S2 of the PMOS transistor P1, that is, the influence of the voltage output by the first NMOS transistor on the voltage of the PMOSE transistor P1 is reduced, thereby avoiding the mis-conduction of the PMOS transistor P1 and improving the accuracy of the switching power supply switching.

[0073] In some embodiments, the first NMOS transistor N1 may further include a second resistor R2, and the second resistor R2 is disposed between the drain and the gate of the NMOS transistor N1. By setting the second resistor R2, on the one hand, resistance voltage division is achieved, so that the drain and gate voltages of the NMOS transistor N1 respectively meet the design requirements of the NMOS transistor. On the other hand, by setting the second resistor R2, when the second NMOS transistor N2 is turned on, the gate of the first NMOS transistor N1 is grounded, and the interference of the ground to the first switching power supply can also be reduced.

[0074] In some embodiments of the present utility model, the first switch circuit 3, the second switch circuit 4, and the fourth switch circuit 6 can also be implemented by a PMOS transistor plus an inverter, and the third switch circuit 5 is implemented by an NMOS transistor plus an inverter. However, the first switch circuit 3, the second switch circuit 4, and the fourth switch circuit 6 are directly implemented by NMOS transistors, and the third switch circuit 5 is directly implemented by a PMOS transistor, with a simpler structure, fewer switching devices used, and savings in device costs.

[0075] In some embodiments of the present utility model, the switching power supply switching device further includes a control unit disposed between the output end of the comparator and the second end of the fourth switch circuit, and is configured to control the on and off of the first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit according to the level signal output by the comparator.

[0076] For example, when the control unit receives a high-level signal, it controls the fourth switch circuit, the third switch circuit, and the second switch circuit to conduct, and the first switch circuit to cut off, so that the second switching power supply supplies power to the controller of the energy storage converter. When the control unit receives a low-level signal, it controls the fourth switch circuit, the third switch circuit, and the second switch circuit to cut off, and the first switch circuit to conduct, so that the first switching power supply supplies power to the controller of the energy storage converter.

[0077] In this embodiment, by setting the control unit, since signals are sent to each switch circuit through the control unit instead of directly controlling the on and off of each switch circuit through high and low levels, the selection range of the switch circuit is wider.

[0078] In some embodiments of the present utility model, a switching power supply switching system is protected. The switching power supply switching system includes the switching power supply switching device in the above embodiment, and further includes an energy storage converter. The controller of the energy storage converter is configured to supply power by using the first switching power supply or the second switching power supply through the switching power supply switching device.

[0079] For example, the first switching power supply is an internal switching power supply, and the second switching power supply is an external switching power supply. When the internal switching power supply cannot output 24 VDC, the external switching power supply supplies power to the controller. When the internal switching power supply outputs 24 VDC, the internal switching power supply supplies power to the controller, realizing the adaptive switching of the power supply for the controller of the energy storage current converter.

[0080] In some embodiments of the present utility model, an electrical device is protected. The electrical device includes the switching power supply switching system in the above embodiment. The electrical device is, for example, various devices including an energy storage converter such as a photovoltaic air conditioner.

[0081] Figure 4Schematic diagram of the process of some embodiments of the power supply method for the energy storage converter of the present utility model. This embodiment includes steps S410 - S420.

[0082] In step S410, when the voltage output by the first switching power supply is less than the voltage output by the second switching power supply, the second switching power supply supplies power to the controller of the energy storage converter.

[0083] For example, taking the first switching power supply as an internal switching power supply and the second switching power supply as an external switching power supply, where the voltage signal output by the internal switching power supply is less than or equal to the voltage signal output by the external switching power supply. As Figure 5 shown, this step S410 includes steps S411 - S413. For example, when the voltage signal output by the internal switching power supply is less than the voltage signal output by the external switching power supply, the on - off states of each component are controlled so that the controller of the energy storage converter is powered by the external switching power supply.

[0084] In step S420, when the voltage output by the first switching power supply is equal to the voltage output by the second switching power supply, the first switching power supply supplies power to the controller of the energy storage converter.

[0085] For example, as Figure 5 shown, this step S420 includes steps S421 - S423. When the voltage signal output by the internal switching power supply is equal to the voltage signal output by the external switching power supply, that is, the internal switching power supply can output a stable voltage signal that meets the stable operation of the controller of the energy storage converter, then by controlling the on - off states of each component, the controller of the energy storage converter is powered by the internal switching power supply.

[0086] By controlling the on - off states of each component, the risk of equipment damage caused by untimely switching between the internal and external switching power supplies due to insufficient operator experience can be reduced.

[0087] Figure 5 Schematic diagram of the process of some embodiments of the power supply method for the energy storage converter of the present utility model. This embodiment is executed based on Figure 3 the circuit structure shown.

[0088] In step S510, the internal switching power supply and the external switching power supply are connected.

[0089] In step S520, the comparator determines whether the voltage signal U 内 output by the internal switching power supply is less than the voltage signal U 外 output by the external switching power supply. If so, step S411 is executed; otherwise, step S421 is executed.

[0090] In step S411, the comparator outputs a high level.

[0091] In step S412, the second NMOS transistor N2 is turned on, the first NMOS transistor N1 is not turned on, the third NMOS transistor N3 is turned on, and the PMOS transistor is turned on.

[0092] In step S413, an external switched-mode power supply supplies power to the controller.

[0093] In step S421, the comparator outputs a low level.

[0094] In step S422, the second NMOS transistor N2 is not turned on, the first NMOS transistor N1 is turned on, the third NMOS transistor N3 is not turned on, and the PMOS transistor is not turned on.

[0095] In step S423, an internal switched-mode power supply supplies power to the controller.

[0096] In step S530, it is determined whether the voltage signal output by the internal switched-mode power supply changes. If it does, step S520 is executed; otherwise, the process ends.

[0097] In the above embodiments, both the internal and external switched-mode power supplies are connected to the controller main board of the energy storage converter through the same switched-mode power supply switching device. By setting up a hardware circuit composed of NMOS transistors, PMOS transistors, and comparators, the adaptive switching of the switched-mode power supply can be achieved. The entire circuit has low loss, high conversion efficiency, and can reduce the damage risk during the testing process of the energy storage converter.

[0098] So far, the present invention has been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solution of the present invention based on the above description.

[0099] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A switching power supply switching device, characterized in that: include: Voltage divider circuit; A comparator, wherein a first input end of the comparator is electrically connected to a first terminal, a second input end of the comparator is electrically connected to a second terminal through the voltage divider circuit, the first terminal is configured to be connected to a positive electrode of a first switching power supply, and the second terminal is configured to be connected to a positive electrode of a second switching power supply; a first switch circuit, wherein a first end of the first switch circuit is electrically connected to the first terminal, a second end of the first switch circuit is electrically connected to a third terminal, and the third terminal is configured to be connected to a first end of a controller of an energy storage converter, wherein a second end of the controller is electrically connected to a fourth terminal, and the fourth terminal is configured to be connected to a negative electrode of the first switch power supply and a negative electrode of the second switch power supply; a second switch circuit, wherein a first terminal of the second switch circuit is electrically connected to a control terminal of the first switch circuit, a second terminal of the second switch circuit is electrically connected to a ground terminal, and a control terminal of the second switch circuit is electrically connected to an output terminal of the comparator and the third terminal; a third switch circuit, wherein a first end of the third switch circuit is electrically connected to the second terminal, and a second end of the third switch circuit is electrically connected to the output end of the comparator and the third terminal; a fourth switch circuit, wherein a first end of the fourth switch circuit is electrically connected to a control end of the third switch circuit, a second end of the fourth switch circuit is electrically connected to a ground end, and a control end of the fourth switch circuit is electrically connected to an output end of the comparator, wherein: When the comparator outputs a first level signal, the fourth switch circuit, the third switch circuit and the second switch circuit are turned on, and the first switch circuit is turned off; when the comparator outputs a second level signal, the fourth switch circuit, the third switch circuit and the second switch circuit are turned off, and the first switch circuit is turned on.

2. The switching power supply switching device according to claim 1, characterized in that: The first input terminal is a reverse input terminal, the second input terminal is a non-inverting input terminal, the first level signal is greater than the second level signal, the first switch circuit includes a first N-type metal-oxide-semiconductor (NMOS) transistor, the second switch circuit includes a second NMOS transistor, the first end of the first switch circuit is electrically connected to the control end, the third switch circuit includes a P-type metal-oxide-semiconductor (PMOS) transistor and a first resistor, wherein the first resistor is arranged between the first end and the control end of the third switch circuit, and the fourth switch circuit includes a fourth NMOS transistor.

3. The switching power supply switching device according to claim 1 or 2, characterized in that: Also includes: A first diode, wherein an anode of the first diode is electrically connected to the control end of the fourth switch circuit, and a cathode of the first diode is electrically connected to the second end of the third switch circuit.

4. The switching power supply switching device according to claim 1 or 2, characterized in that: Also includes: A second diode, wherein an anode of the second diode is electrically connected to the second end of the third switch circuit, and a cathode of the second diode is electrically connected to the third terminal.

5. The switching power supply switching device according to claim 3, characterized in that: Also includes: A second diode, wherein an anode of the second diode is electrically connected to the second end of the third switch circuit, and a cathode of the second diode is electrically connected to the third terminal.

6. The switching power supply switching device according to claim 2, characterized in that: The first switch circuit further includes a second resistor, wherein the second resistor is arranged between the first terminal and the control terminal of the first switch circuit.

7. The switching power supply switching device according to any one of claims 1 to 2, 5 to 6, characterized in that: The voltage divider circuit is a third diode, an anode of the third diode is electrically connected to the second terminal, and a cathode of the third diode is electrically connected to the second input end of the comparator.

8. The switching power supply switching device according to claim 1, characterized in that: Also includes: A control unit is arranged between the output end of the comparator and the second end of the fourth switch circuit, and is configured to control the on and off of the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit according to the level signal output by the comparator.

9. A switching power supply switching system, characterized in that: include: The switching power supply switching device according to any one of claims 1 to 8; as well as The energy storage converter, wherein the controller of the energy storage converter is configured to supply power by using the first switching power supply or the second switching power supply through the switching power supply switching device.

10. An electrical device, characterized in that: include: The switching power supply switching system as claimed in claim 9.

Images