A high-power low-ripple isolated power supply and control method thereof

Abstract

The present application provides a high-power, low-ripple isolated power supply and a control method thereof, which belongs to the field of integrated circuit testing, wherein at least three groups of battery packs or capacitors are included; a switching switch is provided at the input end of each battery pack, and a switching switch is provided at the output end of each equalization protection circuit; the switching switch on the input side of the battery pack or capacitor and the switching switch on the output side of the equalization protection circuit are used to control the shutdown and closure, so that in one charging cycle, one group of battery packs is used to charge through the charging circuit, at least one group of battery packs or capacitors is used to power the load side, and at least one group of battery packs or capacitors is used for transition switching. The present application is more in line with the application scenario of the test system with higher ripple requirements.

Description

Technical Field

[0001] The present application belongs to the field of integrated circuit testing, and more specifically, relates to a high-power, low-ripple isolated power supply for a power semiconductor testing system and a control method thereof. Background Art

[0002] During the power semiconductor testing process, due to the relatively large voltage and current, large pulse current, and large interference between power supplies, it is necessary to have multiple isolated power supplies with small ripple, large instantaneous power, and large instantaneous drive current, etc. This poses a challenge to traditional power supply design.

[0003] First, the design of multi-channel isolated power supply is complex, usually using transformer or photoelectric isolation, and the power is generally not large. Secondly, high-power power supply generally adopts switching power supply design, which is highly efficient and small in size, but the switching characteristics determine that its ripple is generally large. In addition, the traditional power supply has good stable output performance but poor instantaneous power and instantaneous current performance.

[0004] In response to the above requirements, batteries have different characteristics from traditional power sources. First, it is easy to isolate the battery pack when it works independently. Second, the working principle of the battery determines that it has small ripple, large instantaneous power and large instantaneous current. However, the battery cannot work continuously and needs to be charged regularly. If the battery is connected to a load while charging, the ripple at the charging end will be transmitted to the load end, which cannot meet the low ripple requirements of the test system. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of this application is to provide a high-power, low-ripple isolated power supply and a control method thereof, aiming to solve the problem that the battery needs to be charged regularly. If the battery is connected to a load during charging, the ripple at the charging end will be transmitted to the load end, and the low ripple requirement of the test system cannot be met.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present application provides a high-power, low-ripple isolated power supply, including: a switching switch, a battery pack or a capacitor, a balancing protection circuit, an energy storage capacitor, a power supply adjustment circuit, and a power supply output interface;

[0007] At least three battery packs or capacitors are included; a switching switch is provided at the input end of each battery pack, and a switching switch is provided at the output end of each equalization protection circuit; the output end of the charging circuit is connected to the battery pack or capacitor through the switching switch; the output end of each battery pack is connected to a equalization protection circuit; the switching switches at the output end of the equalization protection circuit are connected together and connected to the input end of the power adjustment circuit and the energy storage capacitor; the power adjustment circuit outputs through the power output interface; the energy storage capacitor is connected in parallel at both ends of the load end;

[0008] The switching switch on the input side of the battery pack or capacitor and the switching switch on the output side of the balancing protection circuit are used to control the shutdown and closing so that within one charging cycle, one group of battery packs or capacitors are used to charge through the charging circuit, at least one group of battery packs or capacitors are used to power the load side, and at least one group of battery packs or capacitors are used for transition switching; the power supply adjustment circuit is used to stabilize the output voltage of the battery pack or capacitor, and the stabilized voltage is used as the test drive voltage of the power semiconductor; the energy storage capacitor is used to absorb fluctuations during the switching process of the battery pack or capacitor to ensure the input stability of the power supply adjustment circuit, and then ensure the stability of the power output; the balancing protection circuit is used to balance the output voltages of multiple battery packs or capacitors to ensure that when the output voltages of the battery packs or capacitors are not exactly the same, they can be output normally through the connection of the balancing protection circuit.

[0009] Further preferably, the balancing protection circuit is a diode or a power resistor with a small resistance.

[0010] Further preferably, the battery pack is a lithium battery pack.

[0011] Further preferably, when N isolated power supplies are set, the number of battery groups or capacitors and balancing protection circuits is N+2; the N isolated power supplies share a charging circuit; the power adjustment module and the power output interface are N; and the switch of the balancing protection circuit output is set to N+2.

[0012] Further preferably, increasing the battery pack capacity or the capacitor capacity reduces the cycle of cyclic charging and power supply; reducing the battery pack capacity or the capacitor capacity increases the cycle of cyclic charging and power supply.

[0013] Further preferably, the switching switch adopts a normally open battery relay or a solid-state relay.

[0014] Further preferably, the isolated power supply is a two-way isolated power supply, including: four groups of battery groups or capacitors, two groups of power supply adjustment circuits, two power supply output interfaces, four power diodes and 12 switching switches; the charging circuit is connected to the first group of battery groups or capacitors, the second group of battery groups or capacitors, the third group of battery groups or capacitors and the fourth group of battery groups or capacitors through the first switching switch, the second switching switch, the third switching switch and the fourth switching switch respectively; the first group of battery groups or capacitors is connected to the forty-first switching switch and the forty-second switching switch through the first power diode; the second group of battery groups or capacitors is connected to the fifty-first switching switch and the fifty-second switching switch through the second power diode; the third group of battery groups or capacitors is connected to the sixty-first switching switch and the sixty-second switching switch through the third power diode; the fourth group of battery groups or capacitors is connected to the seventy-first switching switch and the seventy-second switching switch through the fourth power diode; the output ends of the forty-first switching switch, the fifty-first switching switch, the sixty-first switching switch and the seventy-second switching switch are connected to the first power supply adjustment circuit.

[0015] In a second aspect, the present application provides a control method for a high-power, low-ripple isolated power supply, specifically:

[0016] At the beginning of this cycle charging cycle, firstly disconnect the switch closed on the input side of the battery pack or capacitor charged in the previous cycle charging cycle and disconnect the switch on the output side of the battery pack or capacitor to be charged in this cycle charging cycle;

[0017] Close the switch on the output side of the battery pack or capacitor that supplies power during the previous charging cycle;

[0018] Finally, close the switch on the input side of the battery pack or capacitor to be charged in this cycle charging period;

[0019] The switches on the input side of the remaining battery packs or capacitors are disconnected, and the switches on the output side are closed; all battery packs or capacitors are connected to charge in different cycle charging periods in sequence.

[0020] Further preferably, when the isolated power supply includes three battery packs or capacitors, six switching switches and three balancing protection circuits, the control method of the isolated power supply specifically includes the following steps:

[0021] Step 1: disconnect the first switch, the second switch, the third switch and the fourth switch; then close the fifth switch and the sixth switch; and finally close the first switch to charge the first battery pack or capacitor;

[0022] Step 2: After one cycle of charging, the first switch and the fifth switch are disconnected; the fourth switch is then closed; and finally the second switch is closed to charge the second battery pack or capacitor;

[0023] Step 3: After one cycle of charging, the second switch and the sixth switch are disconnected; the fifth switch is then closed; and finally the third switch is closed to charge the third battery pack or capacitor;

[0024] Step 4: After one cycle of charging, the third switch and the fourth switch are disconnected; the sixth switch is then closed; and finally the first switch is closed to charge the first battery pack or capacitor;

[0025] Step 5: After one cycle of charging, go to step 2 and cycle in sequence until the isolated power supply stops working;

[0026] Among them, the first battery group or capacitor, the second battery group or capacitor and the third battery group or capacitor are respectively provided with a first switching switch, a second switching switch and a third switching switch on the input side; the output side of the balancing protection circuit is provided with three switching switches, namely a fourth switching switch, a fifth switching switch and a sixth switching switch.

[0027] Further preferably, when the isolated power supply is a two-way isolated power supply, the control method specifically includes the following steps:

[0028] The first step: charging the first battery pack, using the second battery pack to supply power to the first power supply regulating circuit, and using the third battery pack to supply power to the second power supply regulating circuit;

[0029] Step 2: After a charging cycle, the fourth battery pack is connected in parallel to the second battery pack to supply power to the first power supply adjustment circuit, and then the output end of the second battery pack is disconnected, and the charging circuit is used to charge the second battery pack;

[0030] Step 3: After a charging cycle, the first battery pack is connected in parallel to the third battery pack to supply power to the second power supply adjustment circuit, and then the output end of the third battery pack is disconnected, and the charging circuit is used to charge the third battery pack;

[0031] Step 4: After a charging cycle, the third battery pack is connected in parallel to the fourth battery pack to supply power to the first power supply adjustment circuit, and then the output end of the fourth battery pack is disconnected, and the charging circuit is used to charge the fourth battery pack;

[0032] Step 5: After a charging cycle, the second battery pack is connected in parallel to the first battery pack to supply power to the first power supply adjustment circuit, and then the output end of the first battery pack is disconnected, and the charging circuit is used to charge the first battery pack;

[0033] Step 6: Go to step 2, and so on, cycle in sequence until the isolated power supply stops working;

[0034] Among them, the two isolated power supplies include: four groups of battery groups or capacitors, two groups of power supply adjustment circuits, two power supply output interfaces, four power diodes and 12 switching switches; the charging circuit is connected to the first battery group or capacitor, the second battery group or capacitor, the third battery group or capacitor and the fourth battery group or capacitor respectively through the first switching switch, the second switching switch, the third switching switch and the fourth switching switch; the first battery group or capacitor is connected to the forty-first switching switch and the forty-second switching switch through the first power diode; the second battery group or capacitor is connected to the fifty-first switching switch and the fifty-second switching switch through the second power diode; the third battery group or capacitor is connected to the sixty-first switching switch and the sixty-second switching switch through the third power diode; the fourth battery group or capacitor is connected to the seventy-first switching switch and the seventy-second switching switch through the fourth power diode; the output ends of the forty-first switching switch, the fifty-first switching switch, the sixty-first switching switch and the seventy-first switching switch are connected to the second power supply adjustment circuit; the output ends of the forty-second switching switch, the fifty-second switching switch, the sixty-second switching switch and the seventy-second switching switch are connected to the first power supply adjustment circuit.

[0035] In general, the above technical solutions conceived by this application have the following beneficial effects compared with the prior art:

[0036] The present application provides a high-power, low-ripple isolated power supply and a control method thereof. Compared with the traditional power isolation power supply, the present application replaces the power supply part in the traditional power supply with electromagnetics, and has better isolation and greater instantaneous power. And because the traditional high-power devices and power capacitors, inductors and other components are eliminated, the volume is smaller and the integration is higher. At the same time, since the power supply circuit and the charging circuit are completely isolated, the load is directly powered by the battery, so it has smaller ripple than the traditional power supply, and there is no power frequency harmonics of the traditional power supply and switching noise of the switching power supply, which is more suitable for test system application scenarios with higher ripple requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a power supply structure diagram provided in an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of a power supply structure constructed by specific components provided in an embodiment of the present application;

[0039] Figure 3 This is a schematic diagram of a power supply structure after a large-capacity capacitor replaces a battery according to an embodiment of the present application;

[0040] Figure 4This is a structural diagram of two isolated power supply outputs provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0042] Based on the respective advantages of traditional power supplies and battery packs, the present application combines the two power supplies by separating the charging battery pack and the power supply battery pack through a cyclic switching control method. When one battery pack is charging, the other battery packs are powered. At the same time, an additional battery pack is added for battery transition switching to ensure that there are always 1 to 2 battery packs powering the load end to ensure that there is no impact on the load.

[0043] Since charging and power supply are completely separated, and the cycle of cyclic charging and power supply can be flexibly adjusted, the battery capacity can also be adjusted according to actual needs. When the battery capacity is large, the cycle can be reduced, and when the battery capacity is small, the charging cycle frequency can be increased. In extreme cases, supercapacitors can be used directly instead of batteries to work. Therefore, this method has good flexibility and can be adjusted according to application scenarios.

[0044] like Figure 1 As shown, the present application provides a device for realizing high-power low-ripple isolation voltage of a power semiconductor test system, including: a charging circuit, a switching switch, a battery pack, a balancing protection circuit, an energy storage capacitor, a voltage adjustment circuit and a power output interface;

[0045] The charging circuit is connected to three batteries or large-capacity capacitors through three normally open switches; the three batteries are connected to three independent normally open switches through a balancing protection circuit and finally connected together to a voltage regulating circuit;

[0046] The voltage adjustment circuit outputs through the power output interface;

[0047] Among them, a total of 6 switches at both ends of the battery input and output can be controlled independently.

[0048] Further preferably, the switch adopts a normally open battery relay or a solid-state relay;

[0049] Among them, a total of 6 switches at the input end and the output end of the battery are cyclically switched according to a certain control method; specifically: the fourth switch k4, the fifth switch k5 and the sixth switch k6 at the load end are disconnected and connected in sequence according to a specific rule according to the rotation order of the first switch k1, the second switch k2 and the third switch k3; the first switch k1, the second switch k2 and the third switch k3 are connected in sequence at a certain interval. When a battery needs to be charged, it first disconnects the fourth switch k4, the fifth switch k5 or the sixth switch k6 connected to it, and then turns on the charging switch, and then connects the battery that was being charged at the last moment and has not been connected to the load end to the load end; this cycle ensures that the power supply / charging end is always disconnected from the load end, and secondly, there are always 1 to 2 battery packs connected to the circuit at the load end.

[0050] More specifically, each cycle is divided into 3 steps:

[0051] Step 1: First, the first switch k1, the second switch k2, the third switch k3 and the fourth switch k4 are opened, and then the fifth switch k5 and the sixth switch k6 are closed; then the first switch k1 is closed to charge the first battery;

[0052] Step 2: After one charging cycle, the first switch k1 and the fifth switch k5 are disconnected, the fourth switch k4 is closed, and finally the second switch k2 is closed to charge the second battery;

[0053] Step 3: After one charging cycle, the second switch k2 and the sixth switch k6 are disconnected, the fifth switch k5 is closed, and finally the third switch k3 is closed to charge the third battery;

[0054] Step 4: After one charging cycle, the third switch k3 and the fourth switch k4 are disconnected, the sixth switch k6 is closed, and finally the first switch k1 is closed to charge the first storage battery;

[0055] Step 5: After one charging cycle, go to step 2 and repeat the process.

[0056] The above charging cycle adopts the charging and discharging sequence of the first battery prior to the second battery prior to the third battery, and other charging and discharging sequences may also be adopted, and so on.

[0057] Example

[0058] like Figure 2 As shown, the present application provides a 30V power semiconductor test system high-power low-ripple isolation voltage implementation device. The figure is a one-way power supply structure diagram, and the multi-way isolation power supply is a multi-way Figure 1The structures shown do not interfere with each other; multiple paths can share the charging circuit. If you need to add one more power output, you only need to add a battery pack and output circuit, such as Figure 4 As shown; More generally, when N-way isolated power output is required, the number of battery groups and balancing protection circuits is N+2; when the charging cycle is fast, the battery is also replaced with a capacitor, and its capacity is guaranteed to not produce a significant voltage drop during the power supply process to the load, as shown Figure 3 shown.

[0059] like Figure 4 The figure shows a two-way isolated power supply output structure diagram, the battery pack is a 36V battery pack, the power adjustment circuit is a step-down regulator circuit that stabilizes 36V to 30V, and is used for the test drive voltage of common power semiconductors; 4 batteries share a 36V charging circuit, and the charging circuit is connected to the 4 battery packs through the first switching switch k1, the second switching switch k2, the third switching switch k3 and the fourth switching switch k4 respectively, and the batteries are connected to the 41st switching switch, the 42nd switching switch, the 51st switching switch, the 52nd switching switch, the 61st switching switch, the 62nd switching switch, the 71st switching switch and the 72nd switching switch through power diodes.

[0060] When starting work, all switches are turned off;

[0061] The first step is to charge the first battery pack, the second battery pack supplies power to the second power supply adjustment circuit, and the third battery pack supplies power to the second power supply adjustment circuit; the specific switch actions are executed in the following order: close the first switch k1, the fifty-first switch, and the sixty-second switch;

[0062] In the second step, after a charging cycle, the fourth battery pack is connected in parallel to the second battery pack to supply power to the first power supply adjustment circuit, and then the output end of the second battery pack is disconnected, and the charging circuit is used to charge the second battery pack; the specific switching actions are as follows: disconnecting the first switching switch k1, closing the seventy-first switching switch k71, disconnecting the fifty-first switching switch k51, and closing the second switching switch k2;

[0063] Step 3: After a charging cycle, the first battery pack is connected in parallel to the third battery pack to supply power to the second power supply adjustment circuit, and then the output end of the third battery pack is disconnected, and the charging circuit is used to charge the third battery pack; the specific switching actions are as follows: disconnect the second switching switch k2, close the 42nd switching switch, disconnect the 52nd switching switch, and close the third switching switch k3;

[0064] Step 4: After a charging cycle, the third battery pack is connected in parallel to the fourth battery pack to supply power to the first power supply adjustment circuit, and then the output end of the fourth battery pack is disconnected, and the charging circuit is used to charge the fourth battery pack; the specific switch actions are as follows: disconnect the third switch k3, close the sixty-first switch k61, disconnect the seventy-first switch k71, and close the fourth switch k4;

[0065] The fifth step, after a charging cycle, connect the second battery pack in parallel to the first battery pack to power the first power adjustment circuit, then disconnect the output end of the first battery pack, and use the charging circuit to charge the first battery pack; the specific switching actions are executed in the following order: disconnect the fourth switching switch k4, close the fifty-first switching switch k51, disconnect the forty-first switching switch k41, and close the first switching switch k1.

[0066] The above steps complete the sequential charging of the first battery pack to the fourth battery pack, and ensure that the first output end and the second output end are always powered by the battery pack; and so on, in a sequential cycle.

[0067] In summary, compared with the prior art, the present application has the following advantages:

[0068] The present application provides a high-power low-ripple isolation voltage realization device and method for a power semiconductor test system. Compared with the traditional power isolation power supply, the present application replaces the power supply part in the traditional power supply with a battery, which has better isolation and greater instantaneous power. In addition, since the traditional high-power devices and power capacitors, inductors and other components are eliminated, the volume is smaller and the integration is higher. At the same time, since the power supply circuit and the charging circuit are completely isolated, the load is directly powered by the battery, so it has smaller ripple than the traditional power supply, and there is no power frequency harmonics of the traditional power supply and switching noise of the switching power supply, which is more suitable for the application scenario of the test system with higher ripple requirements.

[0069] It should be understood that expressions such as “include” and “may include” used in the present application indicate the existence of disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements.

[0070] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense.

[0071] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A high-power, low-ripple isolated power supply, characterized in that: include: Switch, battery pack or capacitor, balancing protection circuit, energy storage capacitor, power supply adjustment circuit and power supply output interface; At least three battery packs or capacitors are included; a switching switch is provided at the input end of each battery pack, and a switching switch is provided at the output end of each equalization protection circuit; the output end of the charging circuit is connected to the battery pack or capacitor through the switching switch; the output end of each battery pack is connected to a equalization protection circuit; the switching switches at the output end of the equalization protection circuit are connected together and connected to the input end of the power adjustment circuit and the energy storage capacitor; the power adjustment circuit outputs through the power output interface; the energy storage capacitor is connected in parallel at both ends of the load end; The switching switch on the input side of the battery pack or capacitor and the switching switch on the output side of the balancing protection circuit are used to control the shutdown and closing so that within one charging cycle, one group of battery packs is used to charge through the charging circuit, at least one group of battery packs or capacitors is used to power the load side, and at least one group of battery packs or capacitors is used for transition switching; the power supply adjustment circuit is used to stabilize the output voltage of the battery pack or capacitor, and the stabilized voltage is used as the test drive voltage of the power semiconductor; the energy storage capacitor is used to absorb fluctuations during the switching process of the battery pack or capacitor; the balancing protection circuit is used to balance the output voltages of multiple battery packs or capacitors.

2. The isolated power supply according to claim 1, characterized in that: The balancing protection circuit is a diode or a power resistor.

3. The isolated power supply according to claim 1, characterized in that: When N-way isolated power supply is set, the number of battery groups or capacitors and balancing protection circuits is N+2; N-way isolated power supplies share a charging circuit; the power adjustment module and power output interface are N; The switch setting of the balanced protection circuit output is N+2.

4. The isolated power supply according to claim 1 or 3, characterized in that: Increasing the battery pack capacity or capacitor capacity reduces the cycle of cyclic charging and power supply; reducing the battery pack capacity or capacitor capacity increases the cycle of cyclic charging and power supply.

5. The isolated power supply according to claim 1, characterized in that: The transfer switch uses a normally open battery relay or a solid-state relay.

6. The isolated power supply according to claim 3, characterized in that: The isolated power supply is a two-way isolated power supply, including: four groups of battery groups or capacitors, two groups of power supply adjustment circuits, two power supply output interfaces, four power diodes and 12 switching switches; the charging circuit is connected to the first group of battery groups or capacitors, the second group of battery groups or capacitors, the third group of battery groups or capacitors and the fourth group of battery groups or capacitors through the first switching switch, the second switching switch, the third switching switch and the fourth switching switch respectively; the first group of battery groups or capacitors is connected to the forty-first switching switch and the forty-second switching switch through the first power diode; the second group of battery groups or capacitors is connected to the fifty-first switching switch and the fifty-second switching switch through the second power diode; the third group of battery groups or capacitors is connected to the sixty-first switching switch and the sixty-second switching switch through the third power diode; the fourth group of battery groups or capacitors is connected to the seventy-first switching switch and the seventy-second switching switch through the fourth power diode; the output ends of the forty-first switching switch, the fifty-first switching switch, the sixty-first switching switch and the seventy-first switching switch are connected to the second power supply adjustment circuit; the output ends of the forty-second switching switch, the fifty-second switching switch, the sixty-second switching switch and the seventy-second switching switch are connected to the first power supply adjustment circuit.

7. A control method for the high-power, low-ripple isolated power supply according to claim 1, characterized in that: The specific steps include: At the beginning of this cycle charging cycle, firstly disconnect the switch closed on the input side of the battery pack or capacitor charged in the previous cycle charging cycle and disconnect the switch on the output side of the battery pack or capacitor to be charged in this cycle charging cycle; Close the switch on the output side of the battery pack or capacitor that supplies power during the previous charging cycle; Finally, close the switch on the input side of the battery pack or capacitor to be charged in this cycle charging period; The switches on the input side of the remaining battery packs or capacitors are disconnected, and the switches on the output side are closed; all battery packs or capacitors are connected to charge in different cycle charging periods in sequence.

8. The control method according to claim 7, characterized in that: When the isolated power supply includes three battery groups or capacitors, six switching switches, and three balancing protection circuits, the following steps are specifically included: Step 1: disconnect the first switch, the second switch, the third switch and the fourth switch; then close the fifth switch and the sixth switch; and finally close the first switch to charge the first battery pack or capacitor; Step 2: After one cycle of charging, the first switch and the fifth switch are disconnected; the fourth switch is then closed; and finally the second switch is closed to charge the second battery pack or capacitor; Step 3: After one cycle of charging, the second switch and the sixth switch are disconnected; the fifth switch is then closed; and finally the third switch is closed to charge the third battery pack or capacitor; Step 4: After one cycle of charging, the third switch and the fourth switch are disconnected; the sixth switch is then closed; and finally the first switch is closed to charge the first battery pack or capacitor; Step 5: After one cycle of charging, go to step 2 and cycle in sequence until the isolated power supply stops working; Among them, the first battery group or capacitor, the second battery group or capacitor and the third battery group or capacitor are respectively provided with a first switching switch, a second switching switch and a third switching switch on the input side; the output side of the balancing protection circuit is provided with three switching switches, namely a fourth switching switch, a fifth switching switch and a sixth switching switch.

9. The control method according to claim 7, characterized in that: When the isolated power supply is a two-way isolated power supply, the following steps are specifically included: The first step: charging the first battery pack, using the second battery pack to supply power to the first power supply adjustment circuit, and using the third battery pack to supply power to the second power supply adjustment circuit; Step 2: After a charging cycle, the fourth battery pack is connected in parallel to the second battery pack to supply power to the first power supply adjustment circuit, and then the output end of the second battery pack is disconnected, and the charging circuit is used to charge the second battery pack; Step 3: After a charging cycle, the first battery pack is connected in parallel to the third battery pack to supply power to the second power supply adjustment circuit, and then the output end of the third battery pack is disconnected, and the charging circuit is used to charge the third battery pack; Step 4: After a charging cycle, the third battery pack is connected in parallel to the fourth battery pack to supply power to the first power supply adjustment circuit, and then the output end of the fourth battery pack is disconnected, and the charging circuit is used to charge the fourth battery pack; Step 5: After a charging cycle, the second battery pack is connected in parallel to the first battery pack to supply power to the first power supply adjustment circuit, and then the output end of the first battery pack is disconnected, and the charging circuit is used to charge the first battery pack; Step 6: Go to step 2, and so on, cycle in sequence until the isolated power supply stops working; Among them, the two isolated power supplies include: four groups of battery groups or capacitors, two groups of power supply adjustment circuits, two power supply output interfaces, four power diodes and 12 switching switches; the charging circuit is connected to the first battery group or capacitor, the second battery group or capacitor, the third battery group or capacitor and the fourth battery group or capacitor respectively through the first switching switch, the second switching switch, the third switching switch and the fourth switching switch; the first battery group or capacitor is connected to the forty-first switching switch and the forty-second switching switch through the first power diode; the second battery group or capacitor is connected to the fifty-first switching switch and the fifty-second switching switch through the second power diode; the third battery group or capacitor is connected to the sixty-first switching switch and the sixty-second switching switch through the third power diode; the fourth battery group or capacitor is connected to the seventy-first switching switch and the seventy-second switching switch through the fourth power diode; the output ends of the forty-first switching switch, the fifty-first switching switch, the sixty-first switching switch and the seventy-first switching switch are connected to the second power supply adjustment circuit; the output ends of the forty-second switching switch, the fifty-second switching switch, the sixty-second switching switch and the seventy-second switching switch are connected to the first power supply adjustment circuit.

Images