Control device of split type capacitor charging power supply
By setting the control unit at the load capacitor in the capacitor charging system and using a short cable, combining the voltage and current conversion module, the problem of low detection accuracy of the capacitor charging voltage is solved, and higher control accuracy and stability are achieved, and the solution is to solve the problem of Voltage instability during fast charging.
Patent Information
- Application Number
- CN202420939487.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In the prior art, the detection accuracy of the capacitor charging voltage is low, resulting in poor pulse accuracy and stability, especially when fast charging, there is a problem of voltage instability.
A control device for a split capacitor charging power supply is designed. By setting the control unit at the load capacitor and using a shorter voltage detection cable, the distance between the load capacitor and the control unit is reduced, and the voltage and current conversion module is adopted. Perform detection and control to ensure the accuracy and stability of the charging voltage.
It significantly improves the control accuracy and stability of the capacitor charging voltage, avoids the problem of voltage instability during charging voltage oscillation and fast charging, and improves the stability of pulse energy.
Smart Images
Figure CN222262467U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply, in particular to a control device for a split capacitor charging power supply. Background Art
[0002] In the fields of scientific research, industry, medical treatment and national defense, huge pulse energy sources are needed. The pulse power supply system obtains large pulse energy (for example, more than 3MW) by controlling the rapid charging (charging current of more than 100A) and discharging (discharging current of more than 3000A) of the capacitor. The pulse power supply system is provided with a charging power supply for charging the capacitor; when the capacitor is charged, the energy stored is related to the charging voltage of the capacitor, which means that the control of pulse accuracy depends on the control accuracy of the capacitor charging voltage, and the control accuracy of the capacitor charging voltage depends on the control accuracy of the charging power switch state, and the charging power control signal needs to be based on the detection of the electrical parameters of the capacitor.
[0003] In the prior art, the collection and processing of capacitor charging voltage has the problem of low detection accuracy due to the overall layout and the long voltage detection cable, making it difficult to stably control the charging voltage of the charging capacitor, resulting in poor pulse accuracy and stability. In particular, there is a phenomenon of voltage instability during fast charging. Utility Model Content
[0004] The utility model aims to provide a control device for a split capacitor charging power supply to solve the technical problem that it is difficult to stably control the charging voltage of a charging capacitor and the pulse accuracy and stability are poor.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A control device for a split capacitor charging power supply, comprising a charging power supply, a load capacitor and a control unit, wherein the charging power supply and the load capacitor are separately arranged, and the charging power supply is connected to the load capacitor through a transmission cable; one end of the control unit is connected to the charging power supply, and the other end is connected to the load capacitor through a voltage detection cable;
[0007] The control unit is arranged at the load capacitor; the length of the transmission cable is greater than the length of the voltage detection cable; the control unit is used to detect the charging voltage, and to output a control signal to control the working state of the charging power supply after comparing the charging voltage with a preset value.
[0008] As a preferred solution of the utility model, the length of the voltage detection cable is less than 1m. The length of the voltage detection cable is preferably 0.3m, which can further reduce the adverse effects of the transmission cable due to the length, and make the control unit more accurate in controlling the charging power supply.
[0009] As a preferred solution of the utility model, the control unit includes a voltage conversion module and a control circuit, the voltage conversion module is connected to the load capacitor through the voltage detection cable, the voltage conversion module is connected to the control circuit, and the control circuit is connected to the charging power supply; the voltage conversion module is used to step down the detected load capacitor voltage.
[0010] The voltage conversion module can reduce the collected voltage according to a certain ratio, so that the converted voltage is used as the control voltage inside the control unit. By comparing the control voltage with the preset value voltage, the working state of the charging power supply is controlled.
[0011] As a preferred solution of the utility model, the control unit also includes a current conversion module, which is connected to the control circuit. By collecting the charging current transmitted on the transmission cable, the charging current is converted into a control current inside the control unit through the current conversion module, and the control current is compared with the preset value current to control the working state of the charging power supply.
[0012] As a preferred solution of the utility model, it also includes a detection unit, which is connected to the control unit and the charging power supply respectively, and is used to detect the voltage and current of the load capacitor. The detection unit detects the voltage and current of the load capacitor and uses them as a control signal for controlling the charging power supply.
[0013] As a preferred solution of the utility model, the detection unit includes a voltage detection module, the voltage detection module is connected to the control unit through the voltage detection cable, and the voltage detection module is electrically connected to both ends of the load capacitor. The voltage detection module is connected in parallel at both ends of the load capacitor to obtain the charging voltage of the load capacitor in real time.
[0014] As a preferred solution of the utility model, the detection unit also includes a current detection module, the current detection unit is connected to the control unit via a current detection cable, and the current detection unit is arranged on the transmission cable. By arranging the current detection unit on the transmission cable, the charging current of the load capacitor can be obtained in real time.
[0015] By adopting the above technical solution, the beneficial effects of the utility model are as follows: by arranging the control unit at the load capacitor, reducing the distance between the load capacitor and the control unit, using a shorter voltage detection cable, facilitating accurate detection of the load capacitor voltage, and greatly improving the control accuracy and stability of the capacitor charging voltage. The length of the transmission cable is greater than the length of the voltage detection cable, so that the control unit and the load capacitor are kept away from the charging power supply, avoiding interference of the charging power supply on the control unit and the load capacitor, and effectively solving the problem of charging voltage oscillation and voltage instability during fast charging. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a circuit diagram of a control device for a split capacitor charging power supply in Example 1;
[0017] Figure 2 This is a schematic diagram of signal processing of the control unit of Example 1.
[0018] icon:
[0019] 1-charging power supply, 2-load capacitor, 3-control unit, 4-voltage detection cable, 5-current detection cable, 6-voltage detection module, 7-current detection module, 8-transmission cable, 9-external start-stop control device, 31-current conversion module, 32-voltage conversion module, 33-control circuit, 34-preset value setting module. DETAILED DESCRIPTION
[0020] The utility model is described in detail below in conjunction with the accompanying drawings.
[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0022] Example 1
[0023] like Figure 1-Figure 2 A control device for a split capacitor charging power supply is shown, comprising a charging power supply 1, a load capacitor 2 and a control unit 3, wherein the charging power supply 1 and the load capacitor 2 are arranged in a split type, wherein the split type is that the charging power supply 1 and the load capacitor 2 are respectively placed in two cabinets, or the charging power supply 1 and the charging power supply 2 are arranged in one cabinet; the charging power supply 1 is connected to the load capacitor 2 through a transmission cable 8; one end of the control unit 3 is connected to the charging power supply 1, and the other end is connected to the load capacitor 2 through a voltage detection cable 4;
[0024] Preferably, the charging power supply 1 and the load capacitor 2 are respectively arranged in two cabinets.
[0025] The control unit 3 is arranged at the load capacitor 2; the length of the transmission cable 8 is greater than the length of the voltage detection cable 4; the control unit 3 is used to detect the charging voltage, and to output a control signal to control the working state of the charging power supply 1 after comparing the charging voltage with a preset value.
[0026] Specifically, the length of the voltage detection cable 4 is 0.3 m; the length of the transmission cable 8 arranged between the charging power source 1 and the load capacitor 2 is greater than 1 m.
[0027] Specifically, the control unit 3 is provided with a current detection cable 5 and a current detection module 7 , the current detection cable 5 and the current detection module 7 are connected, and the current detection module 7 is provided on the transmission cable 8 .
[0028] Specifically, the control unit 3 includes a voltage conversion module 32, a current conversion module 31 and a control circuit 33. The voltage conversion module 32 is connected to the load capacitor 2 through a voltage detection cable 4, the voltage conversion module 32 is connected to the control circuit 33, the current conversion module 31 collects the current of the transmission cable 8 through the current detection cable 5, the current conversion module 31 is connected to the control circuit 33, and the control circuit 33 is controlled and connected to the charging power supply 1; the collected voltage of the load capacitor 2 is converted by the voltage conversion module 32 to obtain voltage data that can be compared with a preset value; the collected charging current of the load capacitor 2 is converted by the current conversion module 31 to obtain current data that can be compared with a preset value; voltage comparison and current comparison are performed at the control circuit 33, and a control signal is generated by the result of the voltage comparison and the result of the current comparison.
[0029] Specifically, a preset value setting module 34 is provided in the control circuit 33. The preset value setting module 34 can input and store the input preset values, and the preset values include voltage preset values and current preset values.
[0030] Specifically, the voltage detection module 6 is electrically connected to both ends of the load capacitor 2 , and the voltage detection module 6 is connected to the control unit 3 through the voltage detection cable 4 .
[0031] Specifically, the charging power source 1 is provided with an external start-stop control device 9 , and the external start-stop control device 9 is used to control the charging state of the charging power source 1 .
[0032] In a control device for a split-type capacitor charging power supply of the present embodiment, a voltage detection module 6 detects the voltage of the load capacitor 2 and converts it into an internal control voltage Vf; a control unit 3 sets a voltage preset value Vsz by setting a port; the control unit 3 compares the voltage preset value Vsz with the internal control voltage Vf, outputs a charging control signal, and then controls the working state of the charging power supply 1; when Vsz<Vf, the charging control signal enables the main circuit of the charging power supply 1 to work and charge the load capacitor 2; when Vsz≥Vf, the charging control signal enables the main circuit of the charging power supply 1 to stop and stop charging the load capacitor 2; a current detection module 7 detects the charging current of the load capacitor 2; when the charging current is greater than the current preset value, the charging control signal enables the main circuit of the charging power supply 1 to stop.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A control device for a split capacitor charging power supply, characterized in that: The device comprises a charging power source (1), a load capacitor (2) and a control unit (3); the charging power source (1) and the load capacitor (2) are arranged in a separate manner; the charging power source (1) is connected to the load capacitor (2) via a transmission cable (8); one end of the control unit (3) is connected to the charging power source (1), and the other end is connected to the load capacitor (2) via a voltage detection cable (4); The control unit (3) is arranged at the load capacitor (2); the length of the transmission cable (8) is greater than the length of the voltage detection cable (4); the control unit (3) is used to detect the charging voltage, and to output a control signal to control the working state of the charging power supply (1) after comparing the charging voltage with a preset value.
2. A control device for a split capacitor charging power supply as claimed in claim 1, characterized in that: The length of the voltage detection cable (4) is less than 1 m.
3. The control device of a split capacitor charging power supply according to claim 1, characterized in that: The control unit (3) comprises a voltage conversion module (32) and a control circuit (33); the voltage conversion module (32) is connected to the load capacitor (2) via the voltage detection cable (4); the voltage conversion module (32) is connected to the control circuit (33); and the control circuit (33) is connected to the charging power source (1); the voltage conversion module (32) is used to reduce the voltage of the detected load capacitor (2).
4. A control device for a split capacitor charging power supply as claimed in claim 3, characterized in that: The control unit (3) further comprises a current conversion module (31), wherein the current conversion module (31) is connected to the control circuit (33).
5. The control device of a split capacitor charging power supply as claimed in claim 3, characterized in that: It also comprises a detection unit, which is connected to the control unit (3) and the charging power source (1) respectively, and is used to detect the voltage and current of the load capacitor (2).
6. A control device for a split capacitor charging power supply as claimed in claim 5, characterized in that: The detection unit comprises a voltage detection module (6), the voltage detection module (6) is connected to the control unit (3) via the voltage detection cable (4), and the voltage detection module (6) is electrically connected to two ends of the load capacitor (2).
7. A control device for a split capacitor charging power supply as claimed in claim 5, characterized in that: The detection unit further comprises a current detection module (7), the current detection module (7) being connected to the control unit (3) via a current detection cable (5), and the current detection module (7) being arranged on the transmission cable (8).