Resonance capacitor series-parallel connection structure and resonance capacitor

Abstract

The invention relates to the technical field of capacitors, and provides a resonant capacitor series-parallel connection structure and a resonant capacitor, and the structure comprises a control mainboard which is fixedly embedded with a capacitor access device and a signal indicator, is configured to receive series-parallel connection signals of the resonant capacitor, and is electrically connected with a main circuit; the capacitor access device comprises a digital trigger, N positive electrode access ports and N negative electrode access ports and is configured to be in plug-in connection with the resonant capacitors, the negative electrode access ports are provided with first switches, and when the first switches are turned on, the negative electrode access ports are connected with the positive electrode access ports of the adjacent resonant capacitors; and the signal indicator comprises a signal receiving port embedded with the positive electrode end of the capacitor access device and a second switch device, the second switch device is connected with the positive electrode access port, and when the second switch device is turned on, the positive electrode access port is connected with the positive electrode access port of the adjacent resonant capacitor. The method is suitable for electronic equipment which needs to frequently replace or adjust the resonant capacitor.

Description

Technical Field

[0001] The present invention relates to the field of capacitors, and in particular to a resonant capacitor series-parallel structure and a resonant capacitor. Background Art

[0002] At present, the design of high-voltage constant-current charging power supply based on LC series resonance has been widely used. This design can realize efficient and fast charging of capacitors, and has good load short-circuit resistance, which is particularly suitable for high-repetition-rate pulse power systems. In the power supply industry, LLC (inductor-inductor-capacitor) series resonant converters are widely used due to their low cost and high efficiency. This converter has soft switching characteristics, does not require complex control schemes, supports the use of components with lower rated voltages, and can improve efficiency. Series resonant circuits are used in many fields, such as high-voltage electrical equipment testing, radio engineering, electronic measurement, induction heating, magnetic resonance imaging (MRI), and chemical analysis. These applications utilize the extremely low impedance characteristics of series resonant circuits at specific frequencies to achieve signal amplification, selection, measurement, and energy conversion. However, for increasingly complex electronic products, it is often necessary to connect resonant capacitors in series and parallel, and the existing technology is to connect a single resonant capacitor in the circuit. However, in actual circuit design, this often requires considering how many resonant capacitors can meet the design requirements when designing the circuit, and cannot be connected subsequently. Therefore, the prior art lacks an auxiliary component capable of externally connecting a series or parallel resonant capacitor and a matching resonant capacitor. Summary of the invention

[0003] The present invention proposes a series-parallel structure of a resonant capacitor and a resonant capacitor, which are used for increasingly complex electronic products, and often require the resonant capacitors to be connected in series and parallel. The prior art connects a single resonant capacitor in a circuit. However, in actual circuit design, it is often necessary to consider how many resonant capacitors can meet the design requirements when designing the circuit, and the situation that they cannot be connected subsequently.

[0004] In a first aspect, the present invention provides a series-parallel structure of resonant capacitors, comprising:

[0005] A control mainboard, which is fixedly embedded with a capacitor access device and a signal indicator, and is configured to receive the series-parallel signal of the resonant capacitor and is electrically connected to the main circuit;

[0006] A capacitor access device, comprising a digital trigger, N positive access ports and N negative access ports, configured to plug in a resonant capacitor, wherein the negative access port is provided with a first switch, and when the first switch is turned on, the negative access port is connected to the positive access port of an adjacent resonant capacitor;

[0007] The signal indicator comprises a signal receiving port engaged with the positive terminal of the capacitor access device and a second switch, wherein the second switch is connected to the positive access port, and when the second switch is turned on, the positive access port is connected to the positive access port of the adjacent resonant capacitor.

[0008] In combination with the first aspect, the first switch is configured as a series control switch of adjacent resonant capacitors, wherein the first switch is configured as an anti-reverse insertion detection switch for mapping the real-time potential signal of the negative electrode access port to the signal indicator.

[0009] In combination with the first aspect, the signal indicator is used to determine a voltage difference signal between an output voltage of the capacitor access device and an expected output voltage; wherein,

[0010] When the series-parallel signal received by the control mainboard is a series signal and the pressure difference signal is a positive number, the second switch is closed;

[0011] When the series-parallel signal received by the control mainboard is a parallel signal and the pressure difference signal is a positive number, the first switch is closed.

[0012] In combination with the first aspect, the signal indicator is configured to be controlled in series and parallel association with the PWM drive signal of the main circuit; wherein the resonant capacitor is connected in series and parallel structure in the main circuit;

[0013] The series-parallel association control includes:

[0014] Obtain the expected output voltage and actual output voltage of the main circuit, and calculate the real-time duty cycle of the main circuit;

[0015] According to the real-time duty cycle, the real-time voltage gain and PWM drive signal of the main circuit are determined, and according to the expected voltage gain corresponding to the real-time voltage gain and the PWM drive signal, a series-parallel indication signal is generated, and the series-parallel indication signal is fed back to the signal indicator.

[0016] In combination with the first aspect, the control main board is further embedded with a series mode controller and a parallel mode controller connected to the capacitor access device;

[0017] When the series-parallel signal received by the control mainboard is a parallel control signal, the parallel mode controller is triggered and connected to the capacitor access device.

[0018] When the series-parallel signal received by the control mainboard is a series control signal, the series mode controller is triggered and is connected to the capacitor access device.

[0019] In combination with the first aspect, the series mode controller is used to obtain the real-time resonant frequency of the capacitor access device and the main circuit switching frequency;

[0020] When the switching frequency of the main circuit is lower than half of the resonant frequency, a first resonant signal is generated, and the first resonant signal is used to characterize the discontinuity of the resonant current;

[0021] When the resonant frequency is greater than the main circuit switching frequency, a second resonant signal is generated, and the second resonant signal is used to indicate that the capacitor access device is in an off state;

[0022] When the switching frequency of the resonant frequency main circuit is greater than the resonant frequency, a third resonant signal is generated, and the third resonant signal is used to indicate that the capacitor access device is in a low-loss state.

[0023] In combination with the first aspect, the parallel mode controller is used to obtain a magnetic saturation signal of a capacitor access device;

[0024] When the magnetic saturation signal is characterized by an increase in the current of the capacitor access device, a short-circuit feedback signal is generated;

[0025] When the magnetic saturation signal is characterized by a decrease in the real-time current, the real-time current is determined and a current limiting feedback signal is generated.

[0026] In combination with the first aspect, the digital triggers are respectively connected to the first switches, and the digital codes of the first switches are used as the target drive codes.

[0027] In combination with the first aspect, the first switch and the second switch are connected to the same resonant capacitor, and when the series-parallel signal is a series signal, the second switch is turned off and the first switch is turned on.

[0028] A resonant capacitor, applicable to any of the above-mentioned resonant capacitor series-parallel structures, the resonant capacitor comprising:

[0029] Resonant capacitor body;

[0030] A plug-in port disposed on the bottom surface of the resonant capacitor body, wherein the plug-in port includes a positive plug-in end and a negative plug-in end;

[0031] The positive electrode insertion end is used to insert into the positive electrode access port of the capacitor access device;

[0032] The negative electrode insertion end is used to insert into the negative electrode access port of the capacitor access device.

[0033] The beneficial effects of the present invention are:

[0034] The present invention has a simple structure, is easy to operate, and is easy to realize the series-parallel connection of the resonant capacitors;

[0035] The present invention realizes precise control through a digital trigger and a signal indicator, thereby improving the adjustment accuracy of the resonant frequency;

[0036] The invention is applicable to electronic equipment which needs to frequently replace or adjust the resonant capacitor, and improves the flexibility and reliability of the equipment.

[0037] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0038] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1 A structural diagram of a series-parallel structure of a resonant capacitor in an embodiment of the present invention;

[0041] Figure 2 A control diagram of the first switch when a series connection signal is received in an embodiment of the present invention;

[0042] Figure 3 FIG. 4 is a control diagram of the second switch when a parallel signal is received in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] like Figure 1 As shown, this embodiment provides a series-parallel structure of resonant capacitors, including:

[0045] A control mainboard, which is fixedly embedded with a capacitor access device and a signal indicator, and is configured to receive the series-parallel signal of the resonant capacitor and is electrically connected to the main circuit;

[0046] A capacitor access device, comprising a digital trigger, N positive access ports and N negative access ports, configured to plug in a resonant capacitor, wherein the negative access port is provided with a first switch, and when the first switch is turned on, the negative access port is connected to the positive access port of an adjacent resonant capacitor;

[0047] The signal indicator comprises a signal receiving port engaged with the positive terminal of the capacitor access device and a second switch, wherein the second switch is connected to the positive access port, and when the second switch is turned on, the positive access port is connected to the positive access port of the adjacent resonant capacitor.

[0048] The principle of the above technical solution is:

[0049] In the present invention, a capacitor access device and a signal indicator are fixedly embedded in a control mainboard, and an interface electrically connected to the main circuit is provided on the control mainboard. The control mainboard is responsible for receiving the series-parallel signals of the resonant capacitor and performing corresponding signal processing. The capacitor access device includes a digital trigger, N positive access ports and N negative access ports for plugging in the resonant capacitor. Each negative access port is provided with a first switch, and when the first switch is turned on, the negative access port is connected to the positive access port of the adjacent resonant capacitor. The signal indicator includes a signal receiving port and a second switch engaged with the positive end of the capacitor access device. The second switch is connected to the positive access port, and when the second switch is turned on, the positive access port is connected to the positive access port of the adjacent resonant capacitor.

[0050] In specific operations:

[0051] First, insert the resonant capacitor into the positive and negative access ports of the capacitor access plug.

[0052] Then, the first switch is controlled by a digital trigger to be turned on, thereby realizing the connection between the negative electrode access port and the positive electrode access port of the adjacent resonant capacitor.

[0053] Then, the connection between the positive access port and the positive access port of the adjacent resonant capacitor is controlled by the second switch of the signal indicator.

[0054] Finally, the control mainboard receives the series and parallel signals of the resonant capacitor and performs signal processing to achieve precise adjustment of the resonant frequency.

[0055] The beneficial effects of the above technical solution are:

[0056] The present invention has a simple structure, is easy to operate, and is easy to realize the series-parallel connection of the resonant capacitors;

[0057] The present invention realizes precise control through a digital trigger and a signal indicator, thereby improving the adjustment accuracy of the resonant frequency;

[0058] The invention is applicable to electronic equipment which needs to frequently replace or adjust the resonant capacitor, and improves the flexibility and reliability of the equipment.

[0059] As an embodiment of the present invention: the first switch is configured as a series control switch of adjacent resonant capacitors, wherein the first switch is configured as an anti-reverse insertion detection switch for mapping the real-time potential signal of the negative electrode access port to the signal indicator.

[0060] The principle of the above technical solution is:

[0061] During actual operation, the first switch is arranged at the negative pole access port, which is adjacent to the positive pole access port of another resonant capacitor. The anti-contrast detection switch controlled by the first switch can determine whether the insertion end of the inserted resonant capacitor is the negative pole insertion side.

[0062] The beneficial effects of the above technical solution are:

[0063] The present invention can prevent the resonant capacitor from being inserted in reverse.

[0064] As an embodiment of the present invention: the signal indicator is used to determine the voltage difference signal between the output voltage of the capacitor access device and the expected output voltage; wherein,

[0065] When the series-parallel signal received by the control mainboard is a series signal and the pressure difference signal is a positive number, the second switch is closed;

[0066] When the series-parallel signal received by the control mainboard is a parallel signal and the pressure difference signal is a positive number, the first switch is closed.

[0067] The principle of the above technical solution is:

[0068] like Figure 2 and Figure 3 As shown, the signal indicator of the present invention can measure the pressure difference, and the measured pressure difference is the pressure difference signal between the input voltage and the expected output voltage. By controlling the series-parallel signal received by the mainboard in real time, the switch can be turned off when the pressure difference signal is positive, that is, when the circuit is normal.

[0069] The beneficial effects of the above technical solution are:

[0070] The present invention can control the series-parallel structure of the resonant capacitors of the present invention to realize the switching between the parallel connection and the series connection of the resonant capacitors by means of voltage difference detection.

[0071] As an embodiment of the present invention: the signal indicator is configured to be controlled in series and parallel with the PWM drive signal of the main circuit; wherein the resonant capacitor is connected in series and parallel structure in the main circuit;

[0072] The series-parallel association control includes:

[0073] Obtain the expected output voltage and actual output voltage of the main circuit, and calculate the real-time duty cycle of the main circuit;

[0074] According to the real-time duty cycle, the real-time voltage gain and PWM drive signal of the main circuit are determined, and according to the expected voltage gain corresponding to the real-time voltage gain and the PWM drive signal, a series-parallel indication signal is generated, and the series-parallel indication signal is fed back to the signal indicator.

[0075] The principle of the above technical solution is:

[0076] The present invention can monitor and adjust the duty cycle of the main circuit in real time by performing series-parallel correlation control with the PWM drive signal of the main circuit, thereby realizing accurate control of the output voltage of the resonant capacitor. At the same time, a series-parallel indication signal is generated according to the real-time duty cycle and the corresponding voltage gain, and the signal is fed back to the signal indicator.

[0077] The beneficial effects of the above technical solution are:

[0078] The present invention can synchronously generate series-parallel signals of the resonant capacitor while receiving a PWM driving signal.

[0079] As an embodiment of the present invention: the control main board is also embedded with a series mode controller and a parallel mode controller connected to the capacitor access device;

[0080] When the series-parallel signal received by the control mainboard is a parallel control signal, the parallel mode controller is triggered and connected to the capacitor access device.

[0081] When the series-parallel signal received by the control mainboard is a series control signal, the series mode controller is triggered and is connected to the capacitor access device.

[0082] The principle of the above technical solution is:

[0083] In actual operation, through the series mode controller and the parallel mode controller, the present invention can execute the parallel control mode when there is a parallel control signal; when the series mode signal is generated, the series control mode is triggered.

[0084] As an embodiment of the present invention: the series mode controller is used to obtain the real-time resonant frequency of the capacitor access device and the main circuit switching frequency;

[0085] When the switching frequency of the main circuit is lower than half of the resonant frequency, a first resonant signal is generated, and the first resonant signal is used to characterize the discontinuity of the resonant current;

[0086] When the resonant frequency is greater than the main circuit switching frequency, a second resonant signal is generated, and the second resonant signal is used to indicate that the capacitor access device is in an off state;

[0087] When the switching frequency of the resonant frequency main circuit is greater than the resonant frequency, a third resonant signal is generated, and the third resonant signal is used to indicate that the capacitor access device is in a low-loss state.

[0088] The principle of the above technical solution is:

[0089] The series mode controller is used to obtain the real-time resonant frequency of the capacitor access device and the switching frequency of the main circuit. When the switching frequency of the main circuit is lower than half the resonant frequency of the capacitor access device, the series mode controller generates a first resonant signal, which is used to characterize the discontinuity of the resonant current. When the resonant frequency is higher than the switching frequency of the main circuit, the series mode controller generates a second resonant signal, which is used to characterize that the capacitor access device is in the off state. When the resonant frequency is higher than the switching frequency of the main circuit and the switching frequency of the main circuit is lower than the resonant frequency, the series mode controller generates a third resonant signal, which is used to characterize that the capacitor access device is in a low-loss state. The generation and detection of these signals can help the control system to more accurately judge and control the working state of the capacitor access device, thereby achieving more efficient and reliable series-parallel control of resonant capacitors.

[0090] The beneficial effects of the above technical solution are:

[0091] The present invention can determine the series-parallel structure of the main circuit and the resonant capacitor of the present invention and the circuit status by calculating the resonant frequency.

[0092] As an embodiment of the present invention: the parallel mode controller is used to obtain a magnetic saturation signal of a capacitor access device;

[0093] When the magnetic saturation signal is characterized by an increase in the current of the capacitor access device, a short-circuit feedback signal is generated;

[0094] When the magnetic saturation signal is characterized by a decrease in the real-time current, the real-time current is determined and a current limiting feedback signal is generated.

[0095] The principle of the above technical solution is:

[0096] In actual implementation, the parallel mode controller is used to obtain the magnetic saturation signal of the capacitor access device. When the magnetic saturation signal is characterized by an increase in the current of the capacitor access device, the parallel mode controller generates a short-circuit feedback signal. When the magnetic saturation signal is characterized by a decrease in real-time current, the parallel mode controller generates a current limiting feedback signal based on the real-time current situation. The generation and detection of these feedback signals can help the control system to more accurately judge and control the working state of the capacitor access device, thereby achieving more efficient and reliable series-parallel control of resonant capacitors. As an embodiment of the present invention: the digital trigger is respectively connected to the first switch device, and the digital code of the first switch device is used as the target drive code.

[0097] The principle of the above technical solution is:

[0098] In actual implementation, when the first switch is turned on, it will carry specific digital code information, and this digital code information will be sent to the digital trigger. The digital trigger will work according to this digital code information, so as to control the switch state of the capacitor access device more accurately and effectively.

[0099] As an embodiment of the present invention: when the first switch and the second switch are connected to the same resonant capacitor and the series-parallel signal is a series signal, the second switch is turned off and the first switch is turned on.

[0100] The principle of the above technical solution is:

[0101] The switching state of the same resonant capacitor is jointly controlled. In this case, when the series-parallel signal is a series signal, the second switch will remain closed and the first switch will be turned on. In this way, when the first switch is turned on, the digital code information it carries will be used to control the switching state of the resonant capacitor, thereby achieving precise control of the resonant capacitor. At this time, the second switch remains closed to ensure that only one switch is in the open state, thereby avoiding misoperation and safety issues.

[0102] As an embodiment of the present invention: the present invention provides a resonant capacitor, the resonant capacitor comprising:

[0103] Resonant capacitor body;

[0104] A plug-in port disposed on the bottom surface of the resonant capacitor body, wherein the plug-in port includes a positive plug-in end and a negative plug-in end;

[0105] The positive electrode insertion end is used to insert into the positive electrode access port of the capacitor access device;

[0106] The negative electrode insertion end is used to insert into the negative electrode access port of the capacitor access device.

[0107] The principle of the above technical solution is that the resonant capacitor of the present invention has a high capacitance value, can store and release a large amount of energy, and is suitable for various energy conversion and storage systems. In addition, the resonant capacitor of the present invention also includes two movable switch devices, namely a first switch located at the bottom of the capacitor body and a second switch located at the center of the bottom surface of the capacitor. Two plug-in ports are arranged at the bottom of the capacitor body, respectively located at the positive and negative electrode insertion ends. The two plug-in ports are used to insert the positive electrode access port and the negative electrode access port of the capacitor access device, respectively. In this way, a simple series-parallel resonant capacitor can be realized.

[0108] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A resonant capacitor series-parallel structure, characterized in that: include: A control mainboard, which is fixedly embedded with a capacitor access device and a signal indicator, and is configured to receive the series-parallel signal of the resonant capacitor and is electrically connected to the main circuit; A capacitor access device, comprising a digital trigger, N positive access ports and N negative access ports, configured to plug in a resonant capacitor, wherein the negative access port is provided with a first switch, and when the first switch is turned on, the negative access port is connected to the positive access port of an adjacent resonant capacitor; The signal indicator comprises a signal receiving port engaged with the positive terminal of the capacitor access device and a second switch, wherein the second switch is connected to the positive access port, and when the second switch is turned on, the positive access port is connected to the positive access port of the adjacent resonant capacitor.

2. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The first switch is configured as a series control switch of adjacent resonant capacitors, wherein the first switch is configured as an anti-reverse insertion detection switch for mapping the real-time potential signal of the negative electrode access port to the signal indicator.

3. A resonant capacitor series-parallel structure as claimed in claim 2, characterized in that: The signal indicator is used to determine the voltage difference signal between the output voltage of the capacitor access device and the expected output voltage; wherein, When the series-parallel signal received by the control mainboard is a series signal and the pressure difference signal is a positive number, the second switch is closed; When the series-parallel signal received by the control mainboard is a parallel signal and the pressure difference signal is a positive number, the first switch is closed.

4. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The signal indicator is configured to be controlled in series and parallel with the PWM drive signal of the main circuit; wherein the resonant capacitor is connected in series and parallel structure in the main circuit; The series-parallel association control includes: Obtain the expected output voltage and actual output voltage of the main circuit, and calculate the real-time duty cycle of the main circuit; According to the real-time duty cycle, the real-time voltage gain and PWM drive signal of the main circuit are determined, and according to the expected voltage gain corresponding to the real-time voltage gain and the PWM drive signal, a series-parallel indication signal is generated, and the series-parallel indication signal is fed back to the signal indicator.

5. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The control main board is also embedded with a series mode controller and a parallel mode controller connected to the capacitor access device; When the series-parallel signal received by the control mainboard is a parallel control signal, the parallel mode controller is triggered and connected to the capacitor access device. When the series-parallel signal received by the control mainboard is a series control signal, the series mode controller is triggered and is connected to the capacitor access device.

6. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The series mode controller is used to obtain the real-time resonant frequency of the capacitor access device and the main circuit switching frequency; When the switching frequency of the main circuit is lower than half of the resonant frequency, a first resonant signal is generated, and the first resonant signal is used to characterize the discontinuity of the resonant current; When the resonant frequency is greater than the main circuit switching frequency, a second resonant signal is generated, and the second resonant signal is used to indicate that the capacitor access device is in an off state; When the switching frequency of the resonant frequency main circuit is greater than the resonant frequency, a third resonant signal is generated, and the third resonant signal is used to indicate that the capacitor access device is in a low-loss state.

7. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The parallel mode controller is used to obtain the magnetic saturation signal of the capacitor access device; When the magnetic saturation signal is characterized by an increase in the current of the capacitor access device, a short-circuit feedback signal is generated; When the magnetic saturation signal is characterized by a decrease in the real-time current, the real-time current is determined and a current limiting feedback signal is generated.

8. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The digital triggers are respectively connected to the first switches, and the digital codes of the first switches are used as target drive codes.

9. A resonant capacitor series-parallel structure as claimed in claim 1, characterized in that: The first switch and the second switch are connected to the same resonant capacitor, and when the series-parallel signal is a series signal, the second switch is turned off and the first switch is turned on.

10. A resonant capacitor, applicable to a resonant capacitor series-parallel structure according to any one of claims 1 to 9, characterized in that: The resonant capacitor comprises: Resonant capacitor body; A plug-in port disposed on the bottom surface of the resonant capacitor body, wherein the plug-in port includes a positive plug-in end and a negative plug-in end; The positive electrode insertion end is used to insert into the positive electrode access port of the capacitor access device; The negative electrode insertion end is used to insert into the negative electrode access port of the capacitor access device.

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