Capacitive load device

Abstract

The utility model discloses a capacitive load device, which comprises a master control switch used for being connected with an external power supply in a closed state; the switching unit is connected with the master control switch and comprises a plurality of charging load switches capable of switching the switching states, and each charging load switch is configured to be capable of switching multiple switching states; the buffer unit is used for playing a current limiting role at the moment when the external power supply is connected, the buffer unit comprises a plurality of buffer elements, and each buffer element corresponds to one charging load switch; and the load unit is connected with the buffer unit, the load unit comprises a plurality of capacitive loads, and each capacitive load is correspondingly connected to one buffer element. According to the utility model, the charging of the capacitive loads does not influence each other, the compatibility is good, the circuit can be widely applied to various charging scenes, and the instantaneous current impact on the capacitive loads can be reduced by means of the buffer element.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a capacitive load device. Background Art

[0002] In a high-voltage direct-current electrical system, it is usually necessary to first charge a capacitive load through a high-voltage power supply, and then supply power to products with different voltage levels through the capacitive load. At present, in order to better manage the charging of capacitive loads, the capacitive loads are usually charged uniformly, achieving integrated control of the charging of capacitive loads. However, the prerequisite for this is that the types and parameters of each capacitive load must be the same or similar. Otherwise, the unified charging will fail due to charging mismatch. Considering the situations of different capacitive loads, such a charging method has certain limitations, poor compatibility, cannot be widely applied, and the application scenarios are relatively limited. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems in the related technologies to a certain extent. For this purpose, the utility model provides a capacitive load device with good compatibility, wide applicability and rich application scenarios.

[0004] In a first aspect, an embodiment of the utility model provides a capacitive load device, including:

[0005] A main control switch for connecting an external power supply in a closed state;

[0006] A switching unit connected to the main control switch, including a plurality of charging load switches whose switch states can be switched, and each of the charging load switches is configured to be able to switch multiple switch states;

[0007] A buffer unit for limiting the current at the moment of connecting to the external power supply. The buffer unit includes a plurality of charging branches, and a buffer element is arranged on each charging branch, and each buffer element corresponds to one of the charging load switches;

[0008] A load unit connected to the buffer unit. The load unit includes a plurality of capacitive loads, and each capacitive load is correspondingly connected to one of the buffer elements;

[0009] Wherein, when the main control switch is in a closed state, for any one of the charging load switches, when the charging load switch is in a first switch state, the charging load switch is connected to the corresponding capacitive load through the corresponding buffer element to charge the capacitive load; when the charging load switch is in a second switch state, the corresponding buffer element and the capacitive load of the charging load switch are removed from the capacitive load device.

[0010] Optionally, in an embodiment of the present utility model, the buffer unit further includes a plurality of access branches, and each access branch corresponds to one of the buffer elements and the charging load switch; for any one of the charging load switches, when the charging load switch is in the third switch state, the charging load switch is connected to the corresponding capacitive load through the corresponding access branch to connect the capacitive load to the capacitive load device.

[0011] Optionally, in an embodiment of the present utility model, a discharging unit is further included. The discharging unit includes a discharging load switch and a discharging resistor for releasing the electric energy of the load unit. The discharging load switch is arranged between the switching unit and the discharging resistor; when the main control switch is in the off state, when the charging load switch is in the third switch state and the discharging load switch is in the on state, the capacitive load corresponding to the charging load switch is connected to the discharging resistor through the corresponding access branch and the discharging load switch to release the electric energy of the capacitive load.

[0012] Optionally, in an embodiment of the present utility model, a control unit is further included. The control unit is used for overall control of the main control switch, the discharging load switch and all the charging load switches. The control unit is respectively connected to the main control switch, the discharging load switch and each charging load switch.

[0013] Optionally, in an embodiment of the present utility model, the sampling unit is used for collecting the real-time charging voltage of each capacitive load. The sampling unit is respectively connected to each capacitive load.

[0014] Optionally, in an embodiment of the present utility model, the charging load switch is a relay, MOSFET or IGBT.

[0015] Optionally, in an embodiment of the present utility model, the capacitive load is a capacitor, supercapacitor or battery pack.

[0016] Optionally, in an embodiment of the present utility model, the buffer element is a power resistor or PTC resistor.

[0017] A capacitive load device proposed by the present utility model has no requirements for the specification parameters of capacitive loads, and the charging between capacitive loads does not affect each other, having good compatibility. For each capacitive load, based on the corresponding charging load switch in the first switch state, the capacitive load can be charged. If the capacitive load is no longer needed, it can also be removed from the capacitive load device based on the corresponding charging load switch in the second switch state, which is very convenient to use and can be widely applied to various charging scenarios of capacitive loads. Moreover, during charging, it is connected to the capacitive load through the corresponding buffer element, and with the help of the buffer element, current limiting can be achieved instantaneously when the external power supply is connected, reducing the instantaneous current impact on the capacitive load. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic block diagram of a capacitive load device provided by an embodiment of the present utility model;

[0019] Figure 2 is a schematic circuit diagram of a capacitive load device provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] It should be noted that although the functional modules are divided in the device schematic diagram, in some cases, the division can be different from that in the device.

[0022] The present utility model provides a capacitive load device, comprising: a master control switch for connecting to an external power supply in a closed state; a switching unit connected to the master control switch, including a plurality of charging load switches whose switch states can be switched, and each charging load switch is configured to be able to switch between multiple switch states; a buffering unit for limiting the current at the moment of connecting to the external power supply, the buffering unit including a plurality of buffering elements, and each buffering element corresponds to one of the charging load switches; a load unit connected to the buffering unit, the load unit including a plurality of capacitive loads, and each capacitive load is correspondingly connected to one of the buffering elements; wherein, when the master control switch is in the closed state, for any one of the charging load switches, when the charging load switch is in the first switch state, the charging load switch is connected to the corresponding capacitive load through the corresponding buffering element to charge the capacitive load; when the charging load switch is in the second switch state, the corresponding buffering element and capacitive load of the charging load switch are removed from the capacitive load device. In the present utility model, there are no requirements for the specification parameters of the capacitive loads, and the charging of each capacitive load does not affect each other, having good compatibility; for each capacitive load, based on the corresponding charging load switch in the first switch state, the capacitive load can be charged, and if the capacitive load is no longer needed, the capacitive load can also be removed from the capacitive load device based on the corresponding charging load switch in the second switch state, which is very convenient to use and can be widely applied to various charging scenarios of capacitive loads; moreover, when charging, it is connected to the capacitive load through the corresponding buffering element, and by means of the buffering element, the current can be limited at the moment of connecting to the external power supply, reducing the instantaneous current impact on the capacitive load.

[0023] Figure 1 FIG. 4 is a schematic block diagram of a capacitive load device 200 provided by an embodiment of the present utility model. Figure 2 FIG. 5 is a schematic circuit diagram of a capacitive load device 200 provided by an embodiment of the present utility model.

[0024] As Figure 1 and Figure 2 shown, the capacitive load device 200 specifically includes, but is not limited to:

[0025] A master control switch S for connecting to an external power supply 100 in a closed state, wherein the external power supply 100 can be, but is not limited to, a DC voltage source or the DC output of other power modules, etc., and there is no limitation here;

[0026] A switching unit 210 connected to the master control switch S, including a plurality of charging load switches whose switch states can be switched (i.e., Figure 2As shown in S1 to Sn), each charging load switch is configured to be switchable among multiple switch states. Among them, the charging load switch can be, but is not limited to, a relay, MOSFET, or IGBT, and can also be a functional unit composed of multiple components with a multi-stage switch function, etc. In other words, as long as a module or unit that can achieve multi-stage switch states can be replaced and applied, there is no limitation here;

[0027] The buffer unit 220 is used to limit the current at the moment when the external power supply 100 is connected. The buffer unit 220 includes several charging branches (i.e., Figure 2 as shown in a1 to an), and a buffer element (i.e., Figure 2 as shown in R1 to Rn) is arranged on each charging branch. Each buffer element corresponds to one of the charging load switches;

[0028] The load unit 230 is connected to the buffer unit 220. The load unit 230 includes several capacitive loads (i.e., Figure 2 as shown in C1 to Cn). Each capacitive load is correspondingly connected to one of the buffer elements. Among them, the capacitive load can be, but is not limited to, a capacitor, a supercapacitor, or a battery pack, and can be a combination of capacitors with equal capacitance or a combination of capacitors with different capacitances;

[0029] Among them, when the main control switch S is in the closed state, for any charging load switch, when the charging load switch is in the first switch state, the charging load switch is connected to the corresponding capacitive load through the corresponding buffer element to charge the capacitive load; when the charging load switch is in the second switch state, the corresponding buffer element and capacitive load of the charging load switch are removed from the capacitive load device 200.

[0030] It can be seen that there are no requirements for the specification parameters of the capacitive load, and the charging of each capacitive load does not affect each other, having good compatibility; for each capacitive load, based on the corresponding charging load switch in the first switch state, the capacitive load can be charged. If the capacitive load is no longer needed, the capacitive load can also be removed from the capacitive load device 200 based on the corresponding charging load switch in the second switch state, which is very convenient to use and can be widely applied to various charging scenarios of capacitive loads; and when charging, it is connected to the capacitive load through the corresponding buffer element, and with the help of the buffer element, it can limit the current at the moment when the external power supply 100 is connected, reducing the instantaneous current impact on the capacitive load.

[0031] In an embodiment, considering the characteristics of the capacitor itself, there will be an instantaneous short-circuit phenomenon and a large current impact when the external power supply 100 is connected. Therefore, in order to weaken the influence of this current impact as much as possible, the buffer element can be, but is not limited to, a power resistor or a PTC resistor, etc.

[0032] In one embodiment, as Figure 2 shown, the number of the charging load switches, the buffer elements and the capacitive loads corresponds to each other, and the specific number can be set accordingly according to the actual application scenario, which is not limited herein.

[0033] In one embodiment, as Figure 2 shown, the buffer unit 220 further includes a plurality of access branches (i.e., Figure 2 b1 to bn shown in

[0034] ). Each access branch corresponds to one of the buffer elements and the charging load switch; for any one of the charging load switches, when the charging load switch is in the third switch state, the charging load switch is connected to the corresponding capacitive load through the corresponding access branch to connect the capacitive load to the capacitive load device 200, and the capacitive load connected to the capacitive load device 200 can be used normally. Figure 1 and Figure 2 , the capacitive load device 200 may further but not limited to include a discharging unit. The discharging unit includes a discharging load switch S0 and a discharging resistor R0 for releasing the electric energy of the load unit 230. The discharging load switch S0 is disposed between the switching unit 210 and the discharging resistor R0; when the main control switch S is in the off state, when the charging load switch is in the third switch state and the discharging load switch S0 is in the on state, the capacitive load corresponding to the charging load switch is connected to the discharging resistor R0 through the corresponding access branch and the discharging load switch S0 to release the electric energy of the capacitive load. That is to say, if the discharging load switch S0 is in the off state, it means that it is in the stop discharging state at present, and the corresponding capacitive load is not discharged at this time; wherein, the discharging resistor R0 may be but not limited to a single resistor, or, as Figure 2 shown, a resistor module composed of a plurality of resistors, etc., which is not limited herein.

[0035] In one embodiment, as Figure 1 shown, the capacitive load device 200 may further but not limited to include a control unit 240. The control unit 240 is used for overall control of the main control switch S, the discharging load switch S0 and all the charging load switches. The control unit 240 is respectively connected to the main control switch S, the discharging load switch S0 and each charging load switch. Among them, the control unit 240 may be but not limited to an MCU, a host computer, etc., which is not limited herein.

[0036] In one embodiment, as Figure 1As shown, the capacitive load device 200 may also but is not limited to include a sampling unit 250. The sampling unit 250 is used to collect the real-time charging voltage of each capacitive load. The sampling unit 250 is respectively connected to each capacitive load. Among them, the sampling unit 250 may also but is not limited to be connected to the control unit 240 to feedback the real-time charging voltage of the capacitive load collected to the control unit 240, so that the control unit 240 controls the corresponding charging load switch according to the real-time charging voltage of the capacitive load, thereby matching the real-time charging situation of the capacitive load.

[0037] To better clarify the working principles of the above embodiments, the following will be described in conjunction with Figure 2 a circuit schematic diagram of the capacitive load device 200 shown.

[0038] Referring to Figure 2 , before the capacitive load device 200 is used, the main control switch S is disconnected, and the charging load switches S1~Sn are switched to the off gear (that is, the charging load switches are in the second switch state), and the discharge load switch S0 is disconnected; when in use, the A and B interfaces of the capacitive load are respectively connected to the positive and negative poles of the DC voltage source that requires the capacitive load (A positive B negative); taking the first group as an example, when in use, the main control switch S is closed, and the charging load switch S1 is first switched from the off state to the a1 end. At this time, the external power supply 100 charges the capacitive load C1 through the current-limiting resistor R1. When the voltage across the capacitive load C1 reaches or approaches the target value (for example, the target value is 95%*Uv, where Uv is the output voltage value of the external power supply 100), the pre-charging of the capacitive load C1 is completed. At this time, the charging load switch S1 is switched from a1 to b1 to complete the connection of the first group of capacitive loads. When it is necessary to remove the capacitive load, only need to switch the charging load switch S1 from b1 to the neutral gear. Similarly, the subsequent second group, third group, etc. can all be charged, connected, and removed in this way, which will not be elaborated here; after use, first disconnect the main control switch S, then close the discharge load switch S0, and switch the charging load switch corresponding to the capacitive load to be discharged to the corresponding bn gear, then the electric energy on the capacitive load can be released to the discharge resistor R0. After the electric energy on the capacitive load is completely released, disconnect the discharge load switch S0, and switch the charging load switch from the bn gear to the neutral gear for the next use.

[0039] It can be seen that during the entire use process, there are no requirements for the specification parameters of the capacitive loads. The charging of each capacitive load does not affect each other. Whichever capacitive load is needed, just use that capacitive load directly, which will not affect the use of other capacitive loads. Therefore, it has good compatibility and can be widely applied to various charging scenarios of capacitive loads.

[0040] It should be noted that the capacitive load device 200 and the application scenarios described in the embodiments of the present utility model are for more clearly explaining the technical solutions of the embodiments of the present utility model, and do not constitute a limitation on the technical solutions provided by the embodiments of the present utility model. As known to those skilled in the art, with the evolution of the capacitive load device 200 and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present utility model are equally applicable to similar technical problems.

[0041] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be included in the protection scope of the present utility model.

Claims

1. A capacitive load device, characterized in that: include: A master control switch, used to connect an external power source in a closed state; A switching unit, connected to the master control switch, comprising a plurality of charging load switches capable of switching switching states, each of the charging load switches being configured to be capable of switching multiple switching states; A buffer unit, used to limit the current at the moment of connecting to the external power supply, the buffer unit includes a plurality of charging branches, each of the charging branches is provided with a buffer element, and each of the buffer elements corresponds to one of the charging load switches; A load unit connected to the buffer unit, wherein the load unit includes a plurality of capacitive loads, each of which is correspondingly connected to one of the buffer elements; Wherein, when the master control switch is in a closed state, for any one of the charging load switches, when the charging load switch is in a first switching state, the charging load switch is connected to the corresponding capacitive load through the corresponding buffer element to charge the capacitive load; when the charging load switch is in a second switching state, the buffer element and the capacitive load corresponding to the charging load switch are removed from the capacitive load device.

2. The capacitive load device according to claim 1, characterized in that: The buffer unit also includes a plurality of access branches, each of which corresponds to one of the buffer elements and the charging load switch; for any one of the charging load switches, when the charging load switch is in a third switching state, the charging load switch is connected to the corresponding capacitive load through the corresponding access branch to connect the capacitive load to the capacitive load device.

3. The capacitive load device according to claim 2, characterized in that: It also includes a discharge unit, which includes a discharge load switch and a discharge resistor for releasing the electric energy of the load unit, and the discharge load switch is arranged between the switching unit and the discharge resistor; when the master control switch is in an open state, when the charging load switch is in a third switch state and the discharge load switch is in a closed state, the capacitive load corresponding to the charging load switch is connected to the discharge resistor through the corresponding access branch and the discharge load switch to release the electric energy of the capacitive load.

4. The capacitive load device according to claim 3, characterized in that: It also includes a control unit, which is used to coordinately control the master control switch, the discharge load switch and all the charging load switches, and the control unit is respectively connected to the master control switch, the discharge load switch and each charging load switch.

5. The capacitive load device according to claim 1, characterized in that: It also includes a sampling unit, which is used to collect the real-time charging voltage of each capacitive load, and the sampling unit is connected to each capacitive load respectively.

6. The capacitive load device according to any one of claims 1 to 5, characterized in that: The charging load switch adopts a relay, a MOSFET or an IGBT.

7. The capacitive load device according to any one of claims 1 to 5, characterized in that: The capacitive load is a capacitor, a super capacitor or a battery pack.

8. The capacitive load device according to any one of claims 1 to 5, characterized in that: The buffer element is a power resistor or a PTC resistor.

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