CN222029665U - Pre-charge and discharge circuit and power equipment - Google Patents
Pre-charge and discharge circuit and power equipment Download PDFInfo
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- CN222029665U CN222029665U CN202323615047.2U CN202323615047U CN222029665U CN 222029665 U CN222029665 U CN 222029665U CN 202323615047 U CN202323615047 U CN 202323615047U CN 222029665 U CN222029665 U CN 222029665U
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Abstract
The application provides a pre-charge and discharge circuit and a power device, wherein the pre-charge and discharge circuit comprises: a switch, a selection switch; one end of the switch is connected with the positive electrode of an external power supply, the other end of the switch is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch is connected with the positive electrode of the load, one selection end of the selection switch is connected with the positive electrode of the external power supply, and the other selection end of the selection switch is grounded; a precharge circuit is formed when one selection end of the selection switch is closed, and a discharge circuit is formed when the other selection end of the selection switch is closed.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to a pre-charge and discharge circuit and power equipment.
Background
The input of an electrical device, such as a high voltage device, is provided with a capacitor, which is turned on before the high voltage device is supplied with power via the high voltage switch. If the voltage difference between two sides of the high-voltage switch is too large when the high-voltage switch is turned on, the switch is turned on to flow very large current instantly, the service life of a device on the high-voltage loop is influenced from the surface, in order to avoid the large current, capacitors in the high-voltage equipment are pre-charged before the high-voltage switch is turned on, and when the voltage difference between two sides of the high-voltage switch is not large, the high-voltage switch is turned on. For high voltage safety, it is generally necessary to discharge the high voltage stored in the high voltage device after the operation of the high voltage device is completed. The common practice is to connect a resistor in series through a switch to discharge, and the pre-charge function and the discharge function are arranged separately in the high-voltage component equipment, and are independently controlled, so that the circuit is complex and the cost is high.
Disclosure of utility model
The embodiment of the application provides a pre-charge and discharge circuit and power equipment, which are combined and arranged, so that the complexity of the circuit is reduced, and the cost is reduced.
A first aspect of an embodiment of the present application provides a precharge and discharge circuit including: a switch, a selection switch; wherein,
One end of the switch is connected with the positive electrode of an external power supply, the other end of the switch is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch is connected with the positive electrode of the load, one selection end of the selection switch is connected with the positive electrode of the external power supply, and the other selection end of the selection switch is grounded;
A precharge circuit is formed when one selection end of the selection switch is closed, and a discharge circuit is formed when the other selection end of the selection switch is closed.
Optionally, the precharge circuit loop and the discharge circuit loop are provided with protection resistors.
Optionally, the protection resistor is a single protection resistor or a plurality of protection resistors.
Optionally, when the protection resistor is a single protection resistor, the single protection resistor is: a PTC resistor; wherein,
One end of the PTC resistor is connected with the public end of the selection switch, and the other end of the PTC resistor is connected with the positive electrode of the load.
Optionally, when the protection resistor is a plurality of protection resistors, the plurality of protection resistors are: a first resistor and a second resistor; wherein,
One end of the first resistor is connected with one selection end of the selection switch, and the other end of the first resistor is connected with the positive electrode of the external power supply;
One end of the second resistor is connected with the other selection end of the selection switch, and the other end of the second resistor is grounded.
Optionally, when the protection resistor is a plurality of protection resistors, the plurality of protection resistors are a PTC resistor and a second resistor, wherein
One end of the second resistor is connected with the other selection end of the selection switch, and the other end of the second resistor is grounded;
One end of the PTC resistor is connected with the public end of the selection switch S2, and the other end of the PTC resistor is connected with the positive electrode of the load.
Optionally, the pre-charge and discharge circuit further includes: and one end of the first resistor is connected with one selection end of the selection switch, and the other end of the first resistor is connected with the positive electrode of the power supply.
Optionally, the pre-charge and discharge circuit further includes: a capacitor;
and two ends of the capacitor are respectively connected with the positive electrode and the negative electrode of the load.
Optionally, the selection switch is a single pole double throw switch.
In a second aspect, there is provided an electrical device comprising the pre-charge and discharge circuit provided in the first aspect.
It can be seen that when the load needs to be powered, one selection end of the selection switch S2 is firstly attracted, the switch S1 is disconnected, the external power supply starts to precharge the capacitor C1 at the moment, after the precharge is completed, one selection end of the switch S2 is disconnected, the switch S1 is attracted, the external power supply supplies power to the load normally, after the work is completed, a discharging process is executed, the switch S1 is disconnected firstly, and the other selection end of the switch S2 is attracted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a precharge and discharge circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another pre-charge and discharge circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a pre-charge and discharge circuit according to a first embodiment of the present application;
Fig. 4 is a schematic structural diagram of a precharge and discharge circuit according to a second embodiment of the present application;
fig. 5 is a schematic structural diagram of a precharge and discharge circuit according to a third embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a precharge and discharge circuit according to the present application, wherein the precharge and discharge circuit includes: a switch S1 and a selection switch S2; wherein,
One end of the switch S1 is connected with the positive electrode of an external power supply, the other end of the switch S1 is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch S2 is connected with the positive electrode of the load, one selection end of the selection switch S2 is connected with the positive electrode of the external power supply, and the other selection end of the selection switch S2 is grounded;
a precharge circuit is formed when one selection end of the selection switch S2 is closed, and a discharge circuit is formed when the other selection end of the selection switch S2 is closed.
According to the technical scheme, when a load needs to be supplied with power, one selection end of the S2 is attracted firstly, the S1 is disconnected at the moment, the external power supply starts to precharge the capacitor C1 at the moment, after the precharge is completed, one selection end of the S2 is disconnected, the S1 is attracted, the external power supply supplies power to the load normally, after the work is completed, a discharging process is executed, the S1 is disconnected firstly, and the other selection end of the S2 is attracted.
For a better illustration of the embodiments of the present application. Referring to fig. 2, fig. 2 is a schematic diagram of another structure of a precharge and discharge circuit according to the present application. The following describes embodiments of the present application with reference to the accompanying drawings, in which the crossing points of the intersecting conductors have dots to indicate that the conductors are connected, and the non-dots at the crossing points indicate that the conductors are not connected, and the load shown in fig. 2 may be a specific electric device, and the present application is not limited to the specific expression form of the electric device.
Illustratively, the precharge circuit loop and the discharge circuit loop are provided with protection resistors; the protection resistor may be a single protection resistor or a plurality of protection resistors. The specific structure of the single protection resistor and the plurality of protection resistors will be described with reference to fig. 2 to 5.
The selection switch S2 may be a single pole double throw switch, for example.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a pre-charge and discharge circuit according to the present application, wherein the protection resistor in fig. 2 is a single protection resistor, and the pre-charge and discharge circuit includes: a switch S1, a selection switch S2, a PTC resistor, a capacitor C1 (optional); wherein,
One end of the switch S1 is connected with the positive electrode of an external power supply, the other end of the switch S1 is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch S2 is connected with one end of the PTC resistor, the other end of the PTC resistor is connected with the positive electrode of the load, one selection end of the selection switch S2 is connected with the positive electrode of the external power supply, and the other selection end of the selection switch S2 is grounded; both ends of the capacitor C1 are connected with the positive pole and the negative pole of the load.
The working principle of the pre-charge and discharge circuit shown in fig. 2 is described below, as shown in fig. 2, when the load needs to be powered, one selection end of the S2 is first attracted, at this time, S1 is disconnected, at this time, the external power supply starts to pre-charge the capacitor C1, after the pre-charge is completed, one selection end of the S2 is disconnected, the S1 is attracted, the external power supply supplies power to the load normally, after the work is completed, the discharge flow is executed, at first, the S1 is disconnected, the other selection end of the S2 is attracted, so that the capacitor C1 forms a discharge path to discharge the capacitor C1, and because the pre-charge and discharge current is larger, the PTC resistor is selected here, thereby effectively avoiding overheating of the resistor and affecting the pre-charge and discharge effect.
Example 1
Referring to fig. 3, fig. 3 is a schematic structural diagram of a precharge and discharge circuit according to an embodiment of the application. The protection resistors of the pre-charge and discharge circuit shown in fig. 3 are multiple, and the embodiments of the present application are described below with reference to the accompanying drawings, in which the crossing points of the intersecting conductors have dots to indicate that the conductors are connected, and the crossing points have no dots to indicate that the conductors are not connected, and the load shown in fig. 3 may be a specific electric device, and the present application is not limited to the specific expression form of the electric device.
One end of the switch S1 is connected with the positive electrode of an external power supply, the other end of the switch S1 is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch S2 is connected with one end of the PTC resistor, the other end of the PTC resistor is connected with the positive electrode of the load, one selection end of the selection switch S2 is connected with the positive electrode of the external power supply, the other selection end of the selection switch S2 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded; both ends of the capacitor C1 are connected with the positive pole and the negative pole of the load.
The working principle of the pre-charge and discharge circuit shown in fig. 3 is described below, as shown in fig. 3, when the load needs to be powered, one selection end of the S2 is first attracted, at this time, S1 is disconnected, at this time, the external power supply starts to pre-charge the capacitor C1, after the pre-charge is completed, one selection end of the S2 is disconnected, the S1 is attracted, the external power supply normally supplies power to the load, after the work is completed, the discharge flow is executed, at first, the S1 is disconnected, the other selection end of the S2 is attracted, so that the capacitor C1 forms a discharge path to discharge the capacitor C1, and because the pre-charge and discharge currents are larger, the PTC resistor is selected here, the effect of pre-charge and discharge can be effectively avoided due to the overheat of the resistor is effectively avoided, and the capacitor protection second resistor R2 is provided, the current size of the capacitor C1 can be effectively reduced, the protection is further formed on the capacitor C1, and the reliability of the circuit is improved. The technical solution in the embodiment shown in fig. 3 simplifies the structure and reduces the cost by combining the precharge and discharge circuits together.
Example two
Referring to fig. 4, fig. 4 is a schematic structural diagram of a precharge and discharge circuit according to a second embodiment of the present application. The protection resistors of the pre-charge and discharge circuit shown in fig. 4 are multiple, and the embodiments of the present application are described below with reference to the accompanying drawings, in which the crossing points of the intersecting conductors have dots to indicate that the conductors are connected, and the crossing points have no dots to indicate that the conductors are not connected, and the load shown in fig. 4 may be a specific electric device, and the present application is not limited to the specific expression form of the electric device.
One end of the switch S1 is connected with the positive electrode of an external power supply, the other end of the switch S1 is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch S2 is connected with one end of the PTC resistor, the other end of the PTC resistor is connected with the positive electrode of the load, one selection end of the selection switch S2 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the positive electrode of an external power supply, the other selection end of the selection switch S2 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded; both ends of the capacitor C1 are connected with the positive pole and the negative pole of the load.
The working principle of the pre-charge and discharge circuit shown in fig. 4 is described below, as shown in fig. 4, when the load needs to be powered, one selection end of the S2 is first attracted, at this time, S1 is disconnected, at this time, the external power supply starts to pre-charge the capacitor C1 by protecting the first resistor R1, after the pre-charge is completed, one selection end of the S2 is disconnected, the S1 is attracted, the external power supply performs normal power supply for the load, after the work is completed, a discharge flow is executed, firstly, the S1 is disconnected, and the other selection end of the S2 is attracted, so that the capacitor C1 forms a discharge path to discharge the capacitor C1, and because the pre-charge and discharge current is larger, the first resistor R1 is arranged on the pre-charge path, so that the pre-charge current can be effectively reduced, and the pre-charge protection is further formed on the capacitor C1. The PTC resistor is selected in the embodiment of the application, so that the effect of pre-charge and discharge can be effectively avoided from being influenced by overheat of the resistor, the capacitor protection second resistor R2 is provided in the embodiment of the application, the current of discharging the capacitor C1 can be effectively reduced, the capacitor C1 is further protected, and the reliability of a circuit is improved. The technical solution in the embodiment shown in fig. 4 simplifies the structure and reduces the cost by combining the precharge and discharge circuits together.
Example III
Referring to fig. 5, fig. 5 is a schematic structural diagram of a precharge and discharge circuit according to a third embodiment of the present application. Referring to fig. 5, an embodiment of the present application will be described with reference to the accompanying drawings, in which a dot at a crossing of intersecting conductors indicates that the conductors are connected, and a dot at a non-crossing indicates that the conductors are not connected, and the load shown in fig. 5 may be a specific electric device, and the present application is not limited to the specific form of the electric device.
One end of the switch S1 is connected with the positive electrode of an external power supply, the other end of the switch S1 is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch S2 is connected with the positive electrode of the load, one selection end of the selection switch S2 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the positive electrode of an external power supply, the other selection end of the selection switch S2 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded; both ends of the capacitor C1 are connected with the positive pole and the negative pole of the load.
The working principle of the pre-charge and discharge circuit shown in fig. 5 is described below, as shown in fig. 5, when the load needs to be powered, one selection end of the S2 is first attracted, at this time, S1 is disconnected, at this time, the external power supply starts to pre-charge the capacitor C1 by protecting the first resistor R1, after the pre-charge is completed, one selection end of the S2 is disconnected, the S1 is attracted, the external power supply performs normal power supply for the load, after the work is completed, a discharge flow is executed, firstly, the S1 is disconnected, and the other selection end of the S2 is attracted, so that the capacitor C1 forms a discharge path to discharge the capacitor C1, and because the pre-charge and discharge current is larger, the first resistor R1 is arranged on the pre-charge path, so that the pre-charge current can be effectively reduced, and the pre-charge protection is further formed on the capacitor C1. The embodiment provides the capacitor protection second resistor R2, which can effectively reduce the discharge current of the capacitor C1, further protect the capacitor C1 and improve the reliability of a circuit. The technical solution in the embodiment shown in fig. 5 simplifies the structure and reduces the cost by combining the precharge and discharge circuits together.
An embodiment of the present application also provides an electrical device (e.g., a high voltage device) including the above-described precharge and discharge circuit. Specific structures of the precharge and discharge circuit can be seen in fig. 1, 2, 3, 4, and 5.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In several embodiments provided by the present application, it should be understood that the disclosed precharge and discharge circuit may be implemented in other ways. For example, the pre-charge and discharge circuit embodiments described above are merely illustrative, and components such as those described above may be used with other components of the same function. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, circuits or components, which may be in electrical or other forms.
In addition, each circuit in the embodiments of the present application may be integrated in one circuit board, or each circuit may exist alone, or two or more circuits may be integrated in one circuit board.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the description of the embodiments being merely intended to facilitate an understanding of the application and its core concepts; meanwhile, as those skilled in the art will appreciate, modifications will be made in the specific embodiments and application scope in accordance with the idea of the present application, and the present disclosure should not be construed as limiting the present application.
Claims (10)
1. A precharge and discharge circuit, said precharge and discharge circuit comprising: a switch, a selection switch; wherein,
One end of the switch is connected with the positive electrode of an external power supply, the other end of the switch is connected with the positive electrode of a load, and the negative electrode of the external power supply and the negative electrode of the load are grounded; the public end of the selection switch is connected with the positive electrode of the load, one selection end of the selection switch is connected with the positive electrode of the external power supply, and the other selection end of the selection switch is grounded;
A precharge circuit is formed when one selection end of the selection switch is closed, and a discharge circuit is formed when the other selection end of the selection switch is closed.
2. The precharge and discharge circuit of claim 1, wherein said precharge circuit loop and said discharge circuit loop are provided with protection resistors.
3. The precharge and discharge circuit of claim 2, wherein the protection resistor is a single protection resistor or a plurality of protection resistors.
4. A pre-charge and discharge circuit according to claim 3, wherein when the protection resistor is a single protection resistor, the single protection resistor is: a PTC resistor; wherein,
One end of the PTC resistor is connected with the public end of the selection switch, and the other end of the PTC resistor is connected with the positive electrode of the load.
5. The precharge and discharge circuit of claim 3, wherein when the protection resistor is a plurality of protection resistors, the plurality of protection resistors are: a first resistor and a second resistor; wherein,
One end of the first resistor is connected with one selection end of the selection switch, and the other end of the first resistor is connected with the positive electrode of the external power supply;
One end of the second resistor is connected with the other selection end of the selection switch, and the other end of the second resistor is grounded.
6. The precharge and discharge circuit of claim 3, wherein when the protection resistor is a plurality of protection resistors, the plurality of protection resistors are a PTC resistor and a second resistor, wherein
One end of the second resistor is connected with the other selection end of the selection switch, and the other end of the second resistor is grounded;
One end of the PTC resistor is connected with the public end of the selection switch S2, and the other end of the PTC resistor is connected with the positive electrode of the load.
7. The precharge and discharge circuit according to claim 6, the precharge and discharge circuit is characterized in that the precharge and discharge circuit further comprises: and one end of the first resistor is connected with one selection end of the selection switch, and the other end of the first resistor is connected with the positive electrode of the power supply.
8. The precharge and discharge circuit according to claim 1, the precharge and discharge circuit is characterized in that the precharge and discharge circuit further comprises: a capacitor;
and two ends of the capacitor are respectively connected with the positive electrode and the negative electrode of the load.
9. The precharge and discharge circuit of claim 1, wherein said select switch is a single pole double throw switch.
10. An electrical device comprising a pre-charge and discharge circuit according to any one of claims 1-9.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222029665U true CN222029665U (en) | 2024-11-19 |
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