Power supply circuit with adjustable voltage

Abstract

The invention provides a power supply circuit with adjustable voltage. Comprising a capacitor bank module, a switch module, a charging module and a control module, the first end of the capacitor bank module is connected with the first end of the switch module, the second end of the capacitor bank module is connected with the first end of the to-be-tested electric equipment, and the second end of the switch module is connected with the output end of the charging module; the first end of the control module is connected with the third end of the capacitor bank module, the second end is connected with the input end of the charging module, and the third end of the control module is connected with the second end of the to-be-tested electric equipment; the control module is used for adjusting the connection mode of each capacitor bank sub-module in the capacitor bank module according to the target voltage required by the to-be-tested electric equipment, controlling the switch module to be connected and disconnected, and controlling the capacitor bank module to output electric energy to the to-be-tested electric equipment. According to the technical scheme, the output voltage level and the output current level of the power supply system for supplying power to the direct-current electric equipment are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of direct current high-power power supplies, and in particular to a power supply circuit with adjustable voltage. Background Art

[0002] With the widespread application and rapid development of DC high-power electrical equipment, power supply systems are facing unprecedented challenges and demands. These devices not only require the power supply system to have a high degree of stability to ensure its continuous and reliable operation, but also put forward more stringent requirements on the output capacity, efficiency, heat dissipation management, safety and monitoring functions of the power supply. Meeting these requirements is crucial to ensure the normal operation of DC high-power electrical equipment, extend its service life and improve overall energy efficiency.

[0003] In the prior art, in a high current short circuit test of a DC contactor or a DC fuse, the power supply system of a conventional test equipment usually adopts a method of rectifying AC power into DC power to realize power output, thereby directly powering the test equipment.

[0004] However, the power provided by the existing power supply system is relatively low and cannot meet the testing requirements of high-power electrical equipment. Summary of the invention

[0005] The present application provides a voltage-adjustable power supply circuit to solve the technical problem that the existing power supply system cannot provide high-power electrical energy output and cannot meet the testing requirements of high-power electrical equipment.

[0006] The voltage-adjustable power supply circuit provided in the present application includes:

[0007] Capacitor bank module, switch module, charging module and control module;

[0008] The first end of the capacitor group module is connected to the first end of the switch module, the second end of the capacitor group module is connected to the first end of the electrical device to be tested, and the second end of the switch module is connected to the output end of the charging module;

[0009] The first end of the control module is connected to the third end of the capacitor group module, the second end of the control module is connected to the input end of the charging module, and the third end of the control module is connected to the second end of the electrical device to be tested;

[0010] The control module is used to adjust the connection mode of each capacitor group submodule in the capacitor group module according to the target voltage required by the electrical equipment to be tested, and control the switch module to be connected;

[0011] The control module is also used to control the switch module to disconnect when the voltage of the capacitor group module reaches the target voltage, and to control the capacitor group module to output electric energy to the electrical equipment to be tested.

[0012] Optionally, in the circuit as described above, the capacitor group module includes a capacitor group unit and a switching unit, and the capacitor group unit includes a plurality of capacitor group sub-modules;

[0013] The first end of the capacitor group unit is connected to the first end of the switching unit, the second end of the switching unit is the first end of the capacitor group module, the third end of the switching unit is the second end of the capacitor group module, and the fourth end of the switching unit and the second end of the capacitor group unit are both the third end of the capacitor group module;

[0014] The switching unit is used to adjust the connection mode of each capacitor group submodule in the capacitor group unit.

[0015] Optionally, in the circuit as described above, the switching unit includes a plurality of first double-ended knife switches and a plurality of second double-ended knife switches;

[0016] For each capacitor group submodule, the first end of the capacitor group submodule is connected to the first end of the first double-ended knife switch, the second end of the capacitor group submodule is connected to the first end of the second double-ended knife switch, the second end of the first double-ended knife switch and the second end of the second double-ended knife switch are both second ends of the switching unit, and the second end of the first double-ended knife switch and the second end of the second double-ended knife switch are also third ends of the switching unit;

[0017] For each capacitor group submodule, the third end of the first double-ended knife switch is connected to the third end of the second double-ended knife switch corresponding to the adjacent capacitor group submodule.

[0018] Optionally, in the circuit as described above, the capacitor bank submodule includes a plurality of capacitors, a first fuse and a discharge box;

[0019] Multiple capacitors are connected in parallel and / or in series;

[0020] The first end of the first fuse is the first end of the capacitor group submodule, the second end of the first fuse is connected to the first ends of the plurality of capacitors, and the second ends of the plurality of capacitors are the second ends of the capacitor group submodule;

[0021] The first end of the discharge box is connected to the third ends of the plurality of capacitors, and the second end of the discharge box is connected to the fourth ends of the plurality of capacitors.

[0022] Optionally, in the circuit as described above, the discharge box includes a contactor and a discharge resistor;

[0023] The first end of the contactor is the first end of the discharge box, the second end of the contactor is connected to the first end of the discharge resistor, and the second end of the discharge resistor is the second end of the discharge box.

[0024] Optionally, in the circuit as described above, the capacitor group unit further includes a slave control unit, and the first end of the slave control unit is the second end of the capacitor group unit;

[0025] The slave control unit is used to upload the status of each capacitor group submodule to the control module according to the control instruction sent by the control module.

[0026] Optionally, in the circuit as described above, the switching unit further comprises a position sensor, and the first end of the position sensor is the fourth end of the switching unit;

[0027] The position sensor is used to collect the first on / off state of each first double-ended knife switch and the second on / off state of each second double-ended knife switch, and send the first on / off state of each first double-ended knife switch and the second on / off state of each second double-ended knife switch to the control module.

[0028] Optionally, the circuit as described above further includes a voltage transformer, a first end of the voltage transformer is connected to the fourth end of the capacitor group module, and a second end of the voltage transformer is connected to the fourth end of the control module.

[0029] Optionally, in the circuit as described above, the charging module includes a rectifier unit and an AC power supply;

[0030] The output end of the rectifier unit is the output end of the charging module, the first input end of the rectifier unit is connected to the output end of the AC power supply, and the second input end of the rectifier unit is the input end of the charging module.

[0031] Optionally, the circuit as described above further includes a second fuse, a first end of the second fuse is connected to the second end of the capacitor group module, and a second end of the second fuse is connected to the first end of the electrical device to be tested.

[0032] The voltage-adjustable power supply circuit provided in the present application includes a capacitor group module, a switch module, a charging module and a control module; the first end of the capacitor group module is connected to the first end of the switch module, the second end of the capacitor group module is connected to the first end of the electrical equipment to be tested, and the second end of the switch module is connected to the output end of the charging module; the first end of the control module is connected to the third end of the capacitor group module, the second end of the control module is connected to the input end of the charging module, and the third end of the control module is connected to the second end of the electrical equipment to be tested; the control module is used to adjust the connection mode of each capacitor group sub-module in the capacitor group module according to the target voltage required by the electrical equipment to be tested, and control the switch module to be connected; the control module is also used to control the switch module to disconnect when the voltage of the capacitor group module is the target voltage, and control the capacitor group module to output electric energy to the electrical equipment to be tested, thereby realizing the adjustable output voltage of the power supply system and effectively improving the output power level of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0034] Figure 1 A system architecture diagram of a voltage-adjustable power supply circuit provided in this application;

[0035] Figure 2 A schematic diagram of the structure of a first embodiment of a voltage-adjustable power supply circuit provided in the present application;

[0036] Figure 3 A schematic diagram of the structure of the second embodiment of the voltage-adjustable power supply circuit provided in the present application;

[0037] Figure 4 This is a schematic diagram of the structure of the third embodiment of the voltage-adjustable power supply circuit provided in the present application;

[0038] Figure 4a This is a schematic diagram of the relationship between the double-ended knife switch and the output voltage in the third embodiment of the voltage-adjustable power supply circuit provided in the present application.

[0039] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0041] When existing DC power supply systems supply power to DC power equipment, they usually rectify AC power into DC power and then directly output it to the DC power equipment. They are unable to provide higher levels of current output and can only ensure that DC power equipment can perform current tests below 3kA. They can only provide current within a certain range and cannot meet the different levels of power demand of high-power power equipment.

[0042] In view of the above technical problems, the inventors realized that the existing power supply system cannot achieve flexible output and high power output of the power supply system. Based on this, the inventors thought of adding a supercapacitor group to the power supply system, and using the fast charging and discharging function of the supercapacitor group, the power supply system can meet the demand for large current in a short time. At the same time, the number of capacitors in the supercapacitor group can be adjusted by switching switches, thereby controlling the output voltage and current to meet the testing requirements of DC power equipment under different conditions.

[0043] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0044] Figure 1 This is a system architecture diagram of a voltage-adjustable power supply circuit provided in this application. Figure 1 As shown, the power supply circuit 100 includes a capacitor group module 101, a switch module 102, a charging module 103, a control module 104 and an electrical device to be tested 102. The above modules work together through electrical connection to complete the functions of electric energy storage, regulation and output.

[0045] The capacitor group module 101 is the core module of the circuit, and includes multiple capacitor group submodules (i.e., multiple capacitor units), and these capacitor units can achieve different voltage outputs. Specifically, the first end of the capacitor group module 101 is connected to the first end of the switch module 102, the second end of the capacitor group module 101 is connected to the first end of the electrical device to be tested 105, and the second end of the switch module 102 is connected to the output end of the charging module 103.

[0046] The control module 104 can adjust the connection mode of the capacitor group submodule in real time according to the needs of the electric device to be tested 105, so that the output voltage of the power supply circuit matches the needs of the current electric device to be tested 105. Specifically, the first end of the control module 104 is connected to the third end of the capacitor group module 101, the second end of the control module 104 is connected to the input end of the charging module 103, and the third end of the control module 104 is connected to the second end of the electric device to be tested 105.

[0047] In this embodiment, the control module 104 is used to adjust the connection mode of each capacitor group submodule in the capacitor group module 101 according to the target voltage required by the electrical device 105 to be tested, and control the switch module 102 to be connected, so as to achieve a rough adjustment limit on the output voltage of the power supply circuit;

[0048] The control module 104 is also used to control the switch module 102 to disconnect when the voltage of the capacitor group module 101 is the target voltage, so that the control module 104 can fine-tune the charging of the capacitor group module 101 and control the capacitor group module 101 to output electric energy to the electrical device 105 to be tested.

[0049] By monitoring the voltage of the capacitor group, the control module 104 can accurately adjust the connection mode of each capacitor group submodule and control the connection or disconnection of the switch module 102 to achieve the target voltage.

[0050] Figure 2This is a schematic diagram of the structure of the first embodiment of the voltage adjustable power supply circuit provided in the present application. Figure 2 As shown, the power supply circuit also includes:

[0051] The capacitor group module 101 includes a capacitor group unit 201 and a switching unit 202. The capacitor group unit 201 includes a plurality of capacitor group submodules 203, wherein the capacitor group submodule 203 is a basic component unit of the circuit and is responsible for storing electrical energy.

[0052] The first end of the capacitor group unit 201 is connected to the first end of the switch unit 202, and the second end of the switch unit 202 is the first end of the capacitor group module 101. Specifically, the second end of the switch unit 202 is responsible for connecting to the switch module 102 to achieve the output of electric energy;

[0053] The third end of the switching unit 202 is the second end of the capacitor bank module 101, wherein the third end of the switching unit 202 is responsible for connecting to the first end of the electrical device to be tested 205;

[0054] The fourth end of the switch unit 202 and the second end of the capacitor group unit 201 are both the third ends of the capacitor group module 101 . Specifically, the fourth end of the switch unit 202 and the second end of the capacitor group unit 201 are responsible for connection with the control module 104 .

[0055] The switching unit 202 is used to adjust the connection mode of each capacitor group submodule 203 in the capacitor group unit 201. For example, according to the instruction of the control module 104, the switching unit 202 can select to connect some capacitor group submodules 203 in series or in parallel to achieve different voltage outputs.

[0056] In this embodiment, each capacitor group submodule 203 contains a plurality of capacitors, which can be connected in different ways (such as in series or in parallel) to achieve the required voltage and capacity. For example, the capacitor group unit 201 includes three capacitor group submodules 203, each of which has two capacitors inside. These capacitors can be set to be connected in series according to demand to achieve a higher voltage output, or connected in parallel to increase the total capacitance. The switching unit 202 may use an electric switch or a mechanical switch (such as a double-headed knife switch) to achieve the connection switching of the capacitor group submodule 203. Under certain conditions (for example, when it is detected that the electrical equipment to be tested requires a higher voltage), the switching unit 202 can automatically adjust the capacitor group submodule 203 to a series configuration.

[0057] Further, the switching unit 202 includes a plurality of first double-ended knife switches 204 and a plurality of second double-ended knife switches 205. Specifically, the double-ended knife switch is a core element in the circuit, and is used to control the connection configuration between the capacitor group submodules 203 to adapt to the voltage and current requirements of the power supply circuit.

[0058] For each capacitor group submodule 203, its first end is connected to the first end of the first double-ended knife switch 204. This connection method ensures that the input end of the capacitor group submodule 203 is directly connected to the double-ended knife switch for easy switching. Similarly, the second end of the capacitor group submodule 203 is connected to the first end of the second double-ended knife switch 205, ensuring that the output end of the capacitor group submodule 203 can also be controlled by the double-ended knife switch.

[0059] Among them, the second end of the first double-ended knife switch 204 and the second end of the second double-ended knife switch 205 are both the second ends of the switching unit 202. Specifically, the second end of the first double-ended knife switch 204 and the second end of the second double-ended knife switch 205 are used to output to the entire capacitor group module 101, and are also the third end of the switching unit 202, allowing these double-ended knife switches to achieve flexible circuit adjustment when switching the capacitor group sub-module 203.

[0060] In addition, for the connection between the double-ended knife switches, the specific connection method includes: the third end of the first double-ended knife switch 204 is connected to the third end of the second double-ended knife switch 205 corresponding to the adjacent capacitor group submodule 203. This connection method realizes the connection between adjacent submodules, so that multiple capacitor submodules can be flexibly combined in series or in parallel through the configuration of the double-ended knife switches. For example, when the control module 104 sends an instruction, the state of these double-ended knife switches can change, and then the capacitor group submodule 203 is configured as a series connection or a parallel connection as needed.

[0061] Exemplarily, when the DC high-power electrical equipment 205 requires a higher test voltage, the target voltage requirement will be sent to the control module 104. At this time, the control module 104 will generate a control instruction based on the target voltage and the size of the capacitors in each capacitor group submodule 203, and send it to the switching unit 202 to control the connection mode of the double-headed knife switch in the switching unit 202. For example, if the target voltage requirement is large, the second end (output end) of multiple capacitor group submodules 203 can be controlled to be connected to the first end (input end) of the next submodule to achieve a series configuration, thereby increasing the voltage output of the entire capacitor group module 101. In the case of requiring a higher current or a larger capacity, the switching unit 202 can connect the first end and the second end of multiple submodules in parallel. In this way, each capacitor group submodule 203 supplies power to the load at the same time, thereby increasing the overall current output capacity. In addition, the knife switch in the switching unit 202 can also be automatically adjusted by the control module 104. By detecting the load demand or the voltage and current values ​​preset by the control module 104, the knife switch of the switching unit 202 automatically switches the connection mode when necessary to achieve the target output state.

[0062] In the embodiment of the present application, the capacitor group unit 201 further includes a slave control unit 206, which is a monitoring and communication module located in the capacitor group unit 201, and its function is to collect the status information of the capacitor group submodule 203 and upload the information to the control module 104. The first end of the slave control unit 206 is the second end of the capacitor group unit 201, so that the status data of the capacitor group submodule 203 can be directly obtained.

[0063] Exemplarily, the slave control unit 206 is responsible for real-time monitoring of the operating status of the capacitor group submodule 203, including parameters such as voltage, current, temperature, etc. When the slave control unit 206 receives a control instruction from the control module 104, it adjusts the data collection and upload method according to the instruction, such as increasing the monitoring frequency of certain parameters or adjusting the collection accuracy.

[0064] Among them, the slave control unit 206 is used to upload the status of each capacitor group submodule 203 to the control module 104 according to the control instruction sent by the control module 104. Specifically, the slave control unit 206 uploads the monitored status data to the control module 104, and the control module 104 adjusts the system operation status according to this information to ensure that the capacitor group unit 201 works in the best state. The existence of the slave control unit 206 enhances the monitoring capability of the power supply circuit, so that the control module 104 can obtain the detailed status of the capacitor group submodule 203 in real time, thereby improving the safety and reliability of the power supply circuit.

[0065] In an embodiment of the present application, the switching unit 202 also includes a position sensor, which is specifically used to monitor the opening and closing states of the first double-ended knife switch 204 and the second double-ended knife switch 205. The first end of the position sensor is the fourth end of the switching unit 202, so as to collect the position state of the double-ended knife switch in real time during the switching process.

[0066] The position sensor is used to collect the second on-off state of each first double-ended knife switch 204 and the second on-off state of each second double-ended knife switch 205, and send the second on-off state of each first double-ended knife switch 204 and the second on-off state of each second double-ended knife switch 205 to the control module 104. Specifically, the position sensor can detect the on-off state of each double-ended knife switch (including the first double-ended knife switch 20 and the second double-ended knife switch 205), and these state information are used to determine whether the knife switch is in the process of opening, closing or switching. The position sensor sends the detected state of the double-ended knife switch to the control module 104 in real time, and the control module 104 adjusts the connection mode of the capacitor group submodule 203 according to these data to ensure the correct configuration of the entire power supply circuit.

[0067] In summary, the position sensor provides accurate switch status monitoring capability, ensuring that the control module 104 can understand the status of each double-ended knife switch in the switching unit 202 in real time. In this way, the power circuit can make timely adjustments to ensure the stability and correctness of the circuit.

[0068] In the embodiment of the present application, the circuit further includes a voltage transformer, a first end of the voltage transformer is connected to the fourth end of the capacitor group module 101 , and a second end of the voltage transformer is connected to the fourth end of the control module 104 .

[0069] The voltage transformer is a component for monitoring the voltage of the capacitor bank module 101. Its first end is connected to the fourth end of the capacitor bank module 101 so as to obtain the voltage information of the capacitor bank module 101 in real time. Its second end is connected to the fourth end of the control module 104 so as to feed back the voltage information to the control module 104.

[0070] The voltage transformer detects the voltage of the capacitor bank module 101 in real time and feeds back the precise voltage value to the control module 104. Then the control module 104 can make real-time adjustments according to the set target voltage range based on the received voltage data, for example, changing the connection mode of the capacitor bank submodule 203 or adjusting the switch state to maintain the stability of the output voltage.

[0071] In short, through real-time monitoring of the voltage transformer, the power circuit can maintain precise control of the voltage, ensuring that the power circuit provides stable voltage output under different loads and working conditions.

[0072] In an embodiment of the present application, the charging module 103 includes a rectifier unit and an AC power supply; the output end of the rectifier unit is the output end of the charging module 103, the first input end of the rectifier unit is connected to the output end of the AC power supply, and the second input end of the rectifier unit is the input end of the charging module 103.

[0073] The function of the rectifier unit is to convert the AC power supply into DC power so as to charge the capacitor bank module 101. The first input end of the rectifier unit is connected to the output end of the AC power supply, and the second input end is the input end of the charging module 103, which is used to receive the signal of the control module 104. The output end of the rectifier unit serves as the output end of the charging module 103, and directly provides DC power to the capacitor bank module 101.

[0074] The AC power supply provides AC power, which is converted into DC power by the rectifier unit, and the DC power is delivered to the capacitor group module 101 for charging. The control module 104 controls the charging process through the second input terminal of the rectifier unit, and can start or stop the charging operation to ensure that the capacitor group module 101 obtains the target power. Exemplarily, the control module 104 determines the current power of the capacitor in the capacitor group module 101 and the voltage required by the DC high-power electrical equipment based on the real-time monitoring data. When the capacitor group module 101 needs to be charged, the control module 104 sends a charging instruction to the rectifier unit to start the operation of the charging module. At the same time, it adjusts the output parameters (such as voltage and current) of the rectifier unit, dynamically adjusts the charging rate, ensures that the charging process gradually increases, and that the voltage and current are always within a safe and effective range during the charging process. To protect the capacitor group module 101 from excessive current shocks.

[0075] The above embodiment describes a voltage-adjustable power supply circuit, which includes a capacitor group module, a switch module, a charging module and a control module. The capacitor group module realizes the series-parallel configuration of each submodule through a switching unit and a double-headed knife switch to adjust the output voltage. The control module controls the operation of these modules according to the load demand, and monitors the capacitor group status and the knife switch position in real time through the slave control unit and the position sensor. The voltage transformer monitors the voltage, and the rectifier unit cooperates with the AC power supply to ensure that the power supply circuit operates efficiently and safely.

[0076] Figure 3 This is a schematic diagram of the structure of the second embodiment of the voltage adjustable power supply circuit provided in this application. Figure 3 As shown, based on the first embodiment, the capacitor group submodule 203 includes a plurality of capacitors 301, a first fuse 302 and a discharge box 303;

[0077] Multiple capacitors 301 are connected in parallel and / or in series. These capacitors 301 are the main elements for storing and releasing energy in the circuit, and each capacitor 301 can be connected in series and / or in parallel to achieve the required voltage and capacitance. Exemplarily, when the capacitors 301 are connected in series, the total voltage is the sum of the voltages of each capacitor 301, and this configuration is suitable for occasions requiring high voltage; when the capacitors 301 are connected in parallel, the total capacitance is the sum of the capacitances of each capacitor 301, and the voltage remains consistent, and this configuration is suitable for occasions requiring a larger capacitance. In short, by combining series and parallel connections, the characteristics of the capacitor group submodule 203 can be flexibly adjusted to meet different power supply requirements.

[0078] Each capacitor group submodule 203 is equipped with a first fuse 302 to protect the circuit. Specifically, the first end of the first fuse 302 is the first end of the capacitor group submodule 203, which is connected to the input end of the circuit, and the second end of the first fuse 302 is connected to the first ends of the plurality of capacitors 301, and the second ends of the plurality of capacitors 301 are the second ends of the capacitor group submodule 203. When an overcurrent or short circuit occurs in the circuit, the first fuse 302 will be disconnected to protect the capacitor 301 and other circuit components from damage. The presence of the fuse ensures that the capacitor group submodule 203 can be isolated in time when a fault occurs, thereby improving the safety and reliability of the circuit.

[0079] Furthermore, the first end of the discharge box 303 is connected to the third ends of the plurality of capacitors, and the second end of the discharge box 303 is connected to the fourth ends of the plurality of capacitors 301, so that when the power supply is disconnected or stops supplying power, the discharge box 303 can gradually dissipate the charge through an internal discharge component (such as a resistor). The design of the discharge box 303 ensures that the capacitor group 301 is quickly and safely restored to a non-charged state after power failure, effectively preventing the energy stored in the capacitor group 301 from causing safety problems during accidental contact or maintenance.

[0080] In this embodiment, the discharge box 303 includes a contactor 304 and a discharge resistor 305;

[0081] The contactor 304 in the discharge box 303 is a control switch device for controlling whether the capacitor 301 is discharged, wherein the first end of the contactor 304 is the first end of the discharge box 303, connected to the capacitor end of the capacitor group submodule 203. When discharge is required, the second end of the contactor 304 is connected to the discharge resistor 305. Specifically, the contactor 304 remains in a disconnected state during the operation of the power circuit to ensure the normal operation of the capacitor bank. When discharge is required (such as power failure, maintenance or overvoltage protection triggering), the contactor 304 is closed, the capacitor bank is connected to the discharge resistor 305, and the discharge process is started.

[0082] In addition, the discharge resistor 305 is a key component in the discharge box 303, which is used to dissipate the energy in the capacitor 301. Among them, the second end of the contactor 304 is connected to the first end of the discharge resistor 305, and the second end of the discharge resistor 305 is the second end of the discharge box 303. When the contactor 304 is closed, the current will pass through the discharge resistor 305, so that the charge in the capacitor 301 is gradually released. Specifically, the discharge resistor 305 converts electrical energy into thermal energy to ensure that the charge of the capacitor 301 is gradually released at a controlled speed. Secondly, the resistance value of the discharge resistor 305 is designed to be a suitable size to complete the discharge of the capacitor 301 within a reasonable time, while preventing overheating or safety problems caused by too fast discharge.

[0083] Exemplarily, during the normal operation of the power circuit, the contactor 304 remains in an open state, and the discharge resistor 305 does not participate in the circuit. At this time, the capacitor group submodule 203 works in a designed series or parallel mode to ensure that the output electric energy meets the load demand. When the system stops power supply or needs to isolate the capacitor group submodule 203 from the circuit, the control module sends a signal to close the contactor 304 and connect the discharge resistor 305. The electric energy in the capacitor 301 is gradually released through the discharge resistor 305 to ensure that the system is in a safe state. Among them, the resistance of the discharge resistor 305 is accurately calculated to avoid overheating during the discharge process, while ensuring that the capacitor 301 is fully discharged within a reasonable time.

[0084] In the embodiment of the present application, the circuit further includes a second fuse, a first end of the second fuse is connected to the second end of the capacitor group module 101, and a second end of the second fuse is connected to the first end of the electrical device to be tested.

[0085] The second fuse is a safety device for protecting the circuit. When the capacitor bank module 101 supplies power to the device under test, if the current exceeds the safety limit of the device or circuit, the second fuse will automatically blow, disconnect the circuit, and protect the device from damage. With the existence of the second fuse, the circuit can be cut off in time when a fault occurs, preventing the impact of high current or short circuit on the entire system.

[0086] The above embodiment describes a capacitor bank submodule and its protection mechanism, wherein the capacitor bank submodule includes a plurality of capacitors, a fuse and a discharge box, overcurrent protection is achieved by the fuse, and the discharge box uses a contactor and a discharge resistor to safely release the charge. The second fuse further protects the connection between the capacitor bank and the device under test, prevents overcurrent and short circuit, and improves the safety and reliability of the power supply circuit.

[0087] Figure 4 This is a schematic diagram of the structure of the third embodiment of the voltage adjustable power supply circuit provided in this application. Figure 4 As shown, based on the first and second embodiments, the switching process of the double-ended knife switch of the voltage-adjustable power supply circuit is described, wherein the double-ended knife switch 40 is connected to the capacitor group unit 201 through a copper bus or a cable. The specific connection method is:

[0088] The positive electrode + of the capacitor group 401 is connected to one end of the double-ended knife switch 4011, and the negative electrode - of the capacitor group 401 is connected to one end of the double-ended knife switch 4012; the positive electrode of the capacitor group 402 is connected to one end of the double-ended knife switch 4021, and the negative electrode - of the capacitor group 402 is connected to one end of the double-ended knife switch 4022; and so on, the positive electrode of the capacitor group 40n is connected to one end of the double-ended knife switch 40n1, and the negative electrode - of the capacitor group 40n is connected to one end of the double-ended knife switch 40n2. By toggling the handle of the double-ended knife switch 40 to the corresponding connection position, the capacitor group unit 201 is connected in series and / or in parallel, and the output voltage of the power supply circuit is roughly adjusted and limited; at the same time, the position sensor feeds back the position state information of each double-ended knife switch 40 to the control module 104. When the switching unit 202 coarsely adjusts the voltage limit to U=U1, the handle of the double-ended knife switch 4011 is toggled to connect 1 and 3, and the handle of the double-ended knife switch 4012 is toggled to connect 1 and 2. When the switching unit 202 coarsely adjusts the voltage limit to U=U1+U2, the handle of the double-ended knife switch 4011 is toggled to connect 1 and 3, and the handle of the double-ended knife switch 4012 is toggled to connect 1 and 3; the handle of the double-ended knife switch 4021 is toggled to connect 1 and 2, and the handle of the double-ended knife switch 4022 is toggled to connect 1 and 2; 1 of the other double-ended knife switches is set to 0. Similarly, when the switching unit coarsely adjusts the voltage limit to U=U1+U2+…Un, the handle of the double-ended knife switch 4011 is toggled to connect 1 and 3, and the handle of the double-ended knife switch 4012 is toggled to connect 1 and 3; the handles of the other double-ended knife switches are all toggled to connect 1 and 2. The specific relationship between the switching of the double-ended knife switch 40 and the output voltage is as follows: Figure 4a shown.

[0089] The working principle of the voltage adjustable power supply circuit includes:

[0090] 1. First power-on:

[0091] Before powering on, check that the mechanical and electrical connections are intact, the voltage of the capacitor bank unit 201 is 0Vdc, and all the 1s of the double-ended knife switches 40 are set to 0. After powering on, the human-machine interface displays no alarm information. If there is an alarm information, check and eliminate it according to the information prompt content until there is no alarm information. According to the voltage level required by the DC high-power electrical equipment, the number of capacitor group submodules 203 in series in the capacitor group unit 201 is first adjusted through the switching unit 202, and the output voltage of the power circuit is roughly limited. The position sensor in the switching unit 202 uploads the connection status information of each double-headed knife switch 40 to the control module 104; click the charging button in the human-machine interface, the control module 104 closes the switch module 102, and starts the charging unit 210 according to the voltage coarse adjustment limit until the voltage transformer V1 collects a voltage value equal to the voltage level required by the DC high-power electrical equipment 205, and the control module 104 automatically coordinates and controls the charging module 103 to stop charging and disconnects the switch module 102; the control module 104 feeds back the DC high-power electrical equipment 205, and the power circuit outputs high-power electrical energy. After the capacitor group unit 201 outputs high-power electrical energy, click the charging button on the human-machine interface, the power circuit automatically charges, and automatically stops charging, and the next super capacitor group outputs high-power electrical energy, and so on. Circular operation.

[0092] (II) Operation process:

[0093] During normal operation, when adjusting the output voltage level of the power supply circuit, first click the discharge button on the touch screen, the control module 104 coordinates and controls the discharge box 303 to close the contactor 304 for discharge, until the voltage value collected by the voltage transformer V1 is 0Vdc, the control module 104 coordinates and controls the discharge box 303 to disconnect the contactor 304, and end the discharge; secondly, adjust the number of series connections of the capacitor group submodules 203 in the capacitor group unit 201 through the switching unit 202, and roughly adjust the output voltage of the power supply circuit. The position sensor in the switching unit 202 uploads the status information of each double-headed knife switch 40 to the control module 104; click the charging button in the human-machine interface, the control module 104 closes the switch module 102, and starts the charging module 103 according to the rough voltage adjustment limit, until the voltage transformer V1 collects a voltage value equal to the required voltage level, the control module 104 automatically coordinates and controls the charging module 103 to stop charging, and disconnects the switch module 102; the control module 104 feeds back the DC high-power electrical equipment 205, and the power supply circuit outputs high-power electrical energy.

[0094] (III) Power-off process:

[0095] When power needs to be turned off, click the power-off button in the human-machine interface. After the control module 206 determines that the power-off conditions are met, it coordinates and controls the discharge box 303 to discharge until the voltage value collected by the voltage transformer V1 is 0Vdc, and then automatically stops discharging, sets the 1 of all double-headed knife switches 40 to 0, turns off all power circuit electrical equipment, and completes the power-off.

[0096] (IV) Maintenance and overhaul:

[0097] When maintenance and inspection is required, click the power-off button on the human-machine interface and perform maintenance and inspection after powering off.

[0098] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0099] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0100] In addition, unless otherwise specified, each functional unit / module in each embodiment of the present application may be integrated into one unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of a software program module.

[0101] If the integrated unit / module is implemented in the form of hardware, the hardware may be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. Unless otherwise specified, the processor may be any appropriate hardware processor, such as a CPU, a GPU, an FPGA, a DSP, an ASIC, etc. Unless otherwise specified, the storage unit may be any appropriate magnetic storage medium or magneto-optical storage medium, such as a resistive random access memory RRAM (Resistive Random Access Memory), a dynamic random access memory DRAM (Dynamic Random Access Memory), a static random access memory SRAM (Static Random-Access Memory), an enhanced dynamic random access memory EDRAM (Enhanced Dynamic Random Access Memory), a high-bandwidth memory HBM (High-Bandwidth Memory), a hybrid memory cube HMC (Hybrid Memory Cube), etc.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0104] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A voltage-adjustable power supply circuit, characterized in that: include: Capacitor bank module, switch module, charging module and control module; The first end of the capacitor group module is connected to the first end of the switch module, the second end of the capacitor group module is connected to the first end of the electrical device to be tested, and the second end of the switch module is connected to the output end of the charging module; The first end of the control module is connected to the third end of the capacitor group module, the second end of the control module is connected to the input end of the charging module, and the third end of the control module is connected to the second end of the electrical device to be tested; The control module is used to adjust the connection mode of each capacitor group submodule in the capacitor group module according to the target voltage required by the electrical equipment to be tested, and control the switch module to be connected; The control module is further configured to control the switch module to be disconnected when the voltage of the capacitor group module is the target voltage, and to control the capacitor group module to output electric energy to the electrical equipment to be tested.

2. The circuit according to claim 1, characterized in that The capacitor group module includes a capacitor group unit and a switching unit, and the capacitor group unit includes a plurality of capacitor group sub-modules; The first end of the capacitor group unit is connected to the first end of the switching unit, the second end of the switching unit is the first end of the capacitor group module, the third end of the switching unit is the second end of the capacitor group module, and the fourth end of the switching unit and the second end of the capacitor group unit are both the third end of the capacitor group module; The switching unit is used to adjust the connection mode of each capacitor group submodule in the capacitor group unit.

3. The circuit according to claim 2, characterized in that The switching unit includes a plurality of first double-ended knife switches and a plurality of second double-ended knife switches; For each capacitor group submodule, the first end of the capacitor group submodule is connected to the first end of the first double-ended knife switch, the second end of the capacitor group submodule is connected to the first end of the second double-ended knife switch, the second end of the first double-ended knife switch and the second end of the second double-ended knife switch are both the second ends of the switching unit, and the second end of the first double-ended knife switch and the second end of the second double-ended knife switch are also the third ends of the switching unit; For each capacitor group submodule, the third end of the first double-ended knife switch is connected to the third end of the second double-ended knife switch corresponding to the adjacent capacitor group submodule.

4. The circuit according to any one of claims 1 to 3, characterized in that: The capacitor group submodule includes a plurality of capacitors, a first fuse and a discharge box; The plurality of capacitors are connected in parallel and / or in series; The first end of the first fuse is the first end of the capacitor group submodule, the second end of the first fuse is connected to the first ends of the plurality of capacitors, and the second ends of the plurality of capacitors are the second end of the capacitor group submodule; The first end of the discharge box is connected to the third ends of the plurality of capacitors, and the second end of the discharge box is connected to the fourth ends of the plurality of capacitors.

5. The circuit according to claim 4, characterized in that The discharge box includes a contactor and a discharge resistor; The first end of the contactor is the first end of the discharge box, the second end of the contactor is connected to the first end of the discharge resistor, and the second end of the discharge resistor is the second end of the discharge box.

6. The circuit according to claim 3, characterized in that The capacitor group unit further includes a slave control unit, and the first end of the slave control unit is the second end of the capacitor group unit; The slave control unit is used to upload the status of each capacitor group submodule to the control module according to the control instruction sent by the control module.

7. The circuit according to claim 3, characterized in that The switching unit further includes a position sensor, wherein the first end of the position sensor is the fourth end of the switching unit; The position sensor is used to collect the first on / off state of each first double-ended knife switch and the second on / off state of each second double-ended knife switch, and send the first on / off state of each first double-ended knife switch and the second on / off state of each second double-ended knife switch to the control module.

8. The circuit according to any one of claims 1 to 3, characterized in that: The circuit further comprises a voltage transformer, a first end of the voltage transformer is connected to the fourth end of the capacitor group module, and a second end of the voltage transformer is connected to the fourth end of the control module.

9. The circuit according to any one of claims 1 to 3, characterized in that: The charging module includes a rectifier unit and an AC power supply; The output end of the rectifier unit is the output end of the charging module, the first input end of the rectifier unit is connected to the output end of the AC power supply, and the second input end of the rectifier unit is the input end of the charging module.

10. The circuit according to any one of claims 1 to 3, characterized in that: The circuit further includes a second fuse, a first end of the second fuse is connected to a second end of the capacitor group module, and a second end of the second fuse is connected to a first end of the electrical device to be tested.

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