Pre-charging circuit

Abstract

The utility model particularly relates to a pre-charging circuit, which comprises a power supply, an inductor, a relay, a first switch, a capacitor and a second switch, the power supply is connected with the capacitor through a lead; and one end of the second switch is arranged between the relay and the first switch, and the other end of the second switch is arranged between the power supply and the capacitor. According to the main technology of the utility model, the control of different circuit states of the pre-charging circuit is realized through the opening and closing control of the first switch and the second switch, so that the problem of large current generated in the opening and closing process of the relay is avoided, the energy released by the capacitor can be collected, and the electric energy consumption is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply charging and discharging technology, specifically to a pre-charging circuit. Background Technology

[0002] With the development of electrical equipment, more and more electrical devices are equipped with built-in capacitors, which often involve the technical issue of pre-charging. Since the capacitor is connected in parallel across the power supply, although the voltage across the capacitor itself does not change abruptly at the moment the power is switched on, its current changes abruptly. At this time, the relay used for switching between the power supply and the capacitor will experience a momentary short circuit due to the sudden current change, causing a large current to flow directly through the relay and resulting in relay wear and tear.

[0003] In the prior art, CN209305363U discloses a pre-charge resistor protection system, which connects a resistor in series with the relay. By setting the resistor, the impact of sudden current changes is reduced, thereby protecting the relay. In fact, the setting of resistors in pre-charge circuits is widely used. Although it can achieve good relay protection, it inevitably leads to power loss. Utility Model Content

[0004] This invention addresses the technical problem of additional power loss caused by the use of resistors to protect the relay safety in the pre-charging circuit in existing technologies. It provides a pre-charging circuit that has advantages such as simple and reliable structure and low power loss.

[0005] This utility model provides a pre-charging circuit, comprising: a power supply, an inductor, a relay, a first switch and a capacitor connected in sequence by wires, and a second switch;

[0006] The power supply and the capacitor are connected by a wire;

[0007] One end of the second switch is disposed between the relay and the first switch, and the other end is disposed between the power supply and the capacitor.

[0008] Specifically, one of the main technical concepts of this utility model is that the different circuit states of the pre-charging circuit can be controlled by opening and closing the first switch and the second switch, thereby avoiding the problem of large current generated during the opening and closing of the relay, and collecting the energy released by the power supply or capacitor, effectively reducing power consumption.

[0009] Furthermore, during the process of the relay opening and closing, the pre-charging circuit includes a first circuit state and a second circuit state.

[0010] When in the first circuit state, the relay is in the open state, the first switch is in the open state, the second switch is in the closed state, and the power supply charges the inductor.

[0011] When in the second circuit state, the relay is in the instantaneous closed state, the first switch is in the closed state, the second switch is in the open state, and the inductor charges the capacitor.

[0012] Specifically, another key technical concept of this utility model is that by using the combination of the open and closed states of the first and second switches, the electrical energy during the process of the relay going from open to closed is first stored in the inductor. Then, the electrical energy stored in the inductor can be used to charge the capacitor. Furthermore, by utilizing the current-stabilizing characteristics of the inductor, the instantaneous state of the relay's closure will not generate a large current, thus ensuring the safety of the relay while also effectively utilizing the electrical energy stored in the inductor.

[0013] Furthermore, during the process of the relay closing and opening, the pre-charging circuit includes a third circuit state and a fourth circuit state.

[0014] When in the third circuit state, the relay is in the closed state, the first switch is in the closed state, the second switch is in the open state, and the capacitor charges the inductor.

[0015] When in the fourth circuit state, the relay is in the momentary disconnection state, the first switch is in the open state, the second switch is in the closed state, and the inductor charges the power supply.

[0016] Specifically, another key technical concept of this utility model is to utilize the combination of the open and closed states of the first and second switches so that the electrical energy of the relay during the process from closing to opening is first stored in the inductor, and then the inductor charges the power supply, thereby reducing the energy loss in the pre-charging circuit.

[0017] Furthermore, both the first switch and the second switch include an N-type MOSFET or a P-type MOSFET.

[0018] Furthermore, two or more sets of capacitors are connected in parallel, and a third switch is provided before any set of capacitors.

[0019] Specifically, another key technical concept of this invention is to use a third switch to select the capacitor to be charged, thereby enabling the pre-charging circuit provided by this invention to charge multiple parallel capacitors simultaneously, thus improving the scalability of this invention.

[0020] Furthermore, the pre-charging circuit includes a controller, and the relay, the first switch, the second switch, and the third switch are respectively connected to the controller.

[0021] In summary, this utility model provides a pre-charging circuit, which has at least the following main technical effects:

[0022] This invention controls different circuit states of the pre-charging circuit by controlling the opening and closing of the first and second switches, thereby avoiding the problem of large current generated during the opening and closing of the relay, and can collect the energy released by the capacitor, effectively reducing power consumption. It has the advantages of safe and reliable circuit structure, high power utilization efficiency and low loss during circuit use. Attached Figure Description

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a pre-charging circuit is provided in one embodiment of this utility model;

[0025] Figure 2 A schematic diagram of a pre-charging circuit is provided in another embodiment of this utility model;

[0026] Figure 3 A schematic diagram of a pre-charging circuit is provided in another embodiment of this utility model. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1 to 3 The present invention will be described in detail below.

[0028] To make the objectives, technical solutions, and advantages of this 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 this utility model and are not intended to limit this utility model.

[0029] The main technical concept of this utility model is to provide a pre-charging circuit that combines inductance with switch adjustment to realize charging and discharging functions, which has at least the advantages of reliable and stable circuit structure and low non-load power consumption.

[0030] For details, please see Figure 1The diagram shown is a structural schematic of a pre-charging circuit provided in an embodiment of this utility model.

[0031] Example 1

[0032] The pre-charging circuit provided by this utility model includes: a power supply, an inductor, a relay, a first switch, and a capacitor connected in sequence by wires, and a second switch; the power supply and the capacitor are connected by wires; one end of the second switch is disposed between the relay and the first switch, and the other end is disposed between the power supply and the capacitor. The working principle of this utility model is as follows:

[0033] The following circuit processes are involved in the process of a relay opening and closing: When the relay opens, the first switch opens and the second switch closes, forming a circuit with the power supply, inductor, relay, and second switch. The power supply charges the inductor. At the instant the relay closes, the first switch closes and the second switch opens, forming a circuit with the power supply, inductor, relay, first switch, and capacitor. The inductor charges the capacitor, and the power supply charges the capacitor normally at this time. Since the current in the inductor does not change abruptly, the current passing through the relay is in a stable state, thus ensuring the safety of the relay. At the same time, the electrical energy stored in the inductor can be fed back to the capacitor, realizing the full utilization of electrical energy. It is worth explaining that the open state refers to the open circuit state of the switch-type device; the closed state refers to the conducting state of the switch-type device; and the instantaneous closing state refers to the closing process of the switch-type device, that is, the transition process of the pre-charging circuit from the first circuit state to the second circuit state.

[0034] The following circuit process is involved in the process of the relay going from closed to open: When the relay is closed, the first switch is closed and the second switch is open. The power supply, inductor, relay, first switch and capacitor form a circuit. The capacitor charges the inductor. At the moment the relay is opened, the first switch is open and the second switch is closed. The power supply, inductor, relay and second switch form a circuit. The inductor charges the power supply, thereby enabling the power supply to recover electrical energy.

[0035] It is worth explaining that the process of a relay going from closed to open is the reverse process of a relay going from open to closed. Please refer to the above explanation for understanding.

[0036] For further details, please see Figure 2 The diagram shown is a structural schematic of a pre-charging circuit provided in another embodiment of this utility model.

[0037] Example 2

[0038] Based on Embodiment 1, the first and second switches include MOSFETs, specifically N-type and P-type MOSFETs, which are insulated-gate field-effect transistors (IGFETs). These are semiconductor devices that utilize the electric field effect of the input circuit to control the output circuit current, thus adapting to the various processes of the pre-charging circuit in Embodiment 1. Combined with... Figure 2 To understand this, in the first circuit state, the current Ibat flows from the power source to the inductor, meaning the power source charges the inductor. In the second circuit state, the current Ibat flows from the inductor to the capacitor, meaning the inductor charges the capacitor. In the third current state, the current Ibat flows from the capacitor to the inductor, meaning the capacitor charges the inductor. In the fourth current state, the current Ibat flows from the inductor to the power source, meaning the inductor charges the power source.

[0039] For further details, please see Figure 3 The diagram shown is a structural schematic of a pre-charging circuit provided in another embodiment of this utility model.

[0040] Example 3

[0041] Based on Embodiment 1 or Embodiment 2, two groups of capacitors are provided, and a third switch is provided in front of each group of capacitors. The third switch is used to control whether the capacitor is connected to the pre-charging circuit, so that the capacitor provided by this utility model can charge multiple capacitors.

[0042] Optionally, the pre-charging circuit includes a controller, and the relay, the first switch, and the second switch are respectively connected to the controller. The controller is used to control the combination of the closed and open states of the relay, the first switch, and the second switch, thereby realizing the relay protection and inductor reverse charging functions of the pre-charging circuit.

[0043] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pre-charge circuit, comprising: The utility model relates to a pre-charge circuit, comprising: a power supply, an inductor, a relay, a first switch and a capacitor connected in sequence by wires, and a second switch; the power supply is connected to the capacitor by wires; one end of the second switch is arranged between the relay and the first switch, and the other end is arranged between the power supply and the capacitor.

2. A precharge circuit as in claim 1, wherein, In the process of turning off to closing of the relay, the pre-charge circuit comprises a first circuit state and a second circuit state; in the first circuit state, the relay is in the off state, the first switch is in the off state, the second switch is in the closed state, and the power supply charges the inductor; in the second circuit state, the relay is in the closing moment state, the first switch is in the closed state, the second switch is in the off state, and the inductor charges the capacitor.

3. A precharge circuit as in claim 2, wherein, In the process of closing to turning off of the relay, the pre-charge circuit comprises a third circuit state and a fourth circuit state; in the third circuit state, the relay is in the closed state, the first switch is in the closed state, the second switch is in the off state, and the capacitor charges the inductor; in the fourth circuit state, the relay is in the turning-off moment state, the first switch is in the off state, the second switch is in the closed state, and the inductor charges the power supply.

4. A precharge circuit as in claim 3, wherein, The first switch and the second switch both comprise N-type MOS tubes, or P-type MOS tubes.

5. A pre-charge circuit as claimed in any one of claims 1 to 4, wherein the pre-charge circuit is configured to apply the pre-charge voltage to the memory cell in response to a pre-charge signal. Two or more groups of capacitors are arranged in parallel, and any group of capacitors is provided with a third switch in front.

6. A precharge circuit as in claim 5, wherein, The pre-charge circuit comprises a controller, and the relay, the first switch, the second switch and the third switch are connected to the controller respectively.

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