CN219960144U - Explosion-proof charging circuit and charging device - Google Patents

Abstract

The utility model discloses an explosion-proof charging circuit and a charging device, wherein the explosion-proof charging circuit comprises an access port for accessing input equipment, an output port for accessing equipment to be charged, a switch module and a control module, wherein the switch module is arranged between the access port and the output port and is used for controlling on/off between the access port and the output port; the input device is used for supplying power to the device to be charged; the control module is connected with the equipment to be charged and the switch module and is used for detecting first electric quantity of the equipment to be charged, and when the first electric quantity is larger than a first preset electric quantity, the control module controls the switch module to be disconnected so as to disconnect the access port from the output port; when the equipment to be charged is charged to the first preset electric quantity, the charging circuit is disconnected to prevent current from flowing backwards, so that electric leakage in the charging process of the equipment to be charged is avoided; the charging circuit is also provided with a plurality of first field effect transistors which are connected in series, and the charging circuit can be turned off only by turning off one of the plurality of first field effect transistors, so that the explosion-proof safety is improved.

Description

Explosion-proof charging circuit and charging device

Technical Field

The utility model relates to the technical field of charging equipment, in particular to an explosion-proof charging circuit and a charging device.

Background

Most of the current electronic devices need a charging device; the electronic device is powered by the charging device. Common electronic devices include flashlights, cell phones, refrigerators, televisions, and the like.

However, these electronic devices are susceptible to leakage during charging. The main reason is that after the charging device is fully charged, the charging circuit inside the charging device is not completely turned off, and then the voltage at two ends of the electronic device can flow back to the other end of the charging device, so that electric leakage occurs. The existence of the leakage phenomenon causes that the equipment to be charged is easy to explode in the charging process, so that the requirement of explosion-proof authentication cannot be met.

Therefore, how to solve the problem that the charging process of the electronic equipment is easy to explode is a problem which needs to be solved at present.

Disclosure of Invention

The utility model aims to provide an explosion-proof charging circuit and a charging device, which are used for solving the problem that an electronic device is easy to explode in a charging process.

The utility model adopts the following scheme for solving the technical problems.

In a first aspect, the present utility model provides an explosion-proof charging circuit comprising:

the access port is used for accessing the input equipment;

the input device is used for supplying power to the equipment to be charged; an anode conductive wire and a cathode conductive wire are arranged between the access port and the output port so as to form a charging loop;

the switch module is arranged between the access port and the output port to control on/off between the access port and the output port; the switch module comprises a plurality of first field effect transistors, and the first field effect transistors are arranged on the positive electrode conducting wire in series;

the control module is connected with the equipment to be charged and the switch module and is used for detecting first electric quantity of the equipment to be charged, and when the first electric quantity is larger than first preset electric quantity, the control module controls the disconnection of the plurality of first field effect transistors so that the access port is disconnected with the output port.

In some embodiments of the present utility model, the first preset electric quantity is an electric quantity when the device to be charged is fully charged.

In some embodiments of the present utility model, the switching module further includes a second fet disposed between the control module and the first fet, and configured to control on/off of the first fet in response to the control module.

In some embodiments of the present utility model, the first field effect transistors and the second field effect transistors are MOS transistors, the number of the first field effect transistors is at least two, and at least two first field effect transistors are serially arranged between the access port and the output port;

the D pole of the second field effect tube is connected with the G poles of at least two first field effect tubes, the S pole of the second field effect tube is connected with the negative electrode conductive wire, and the G pole of the second field effect tube is connected with the control module.

In some embodiments of the present utility model, the first field effect transistor is an N-channel MOS transistor, and the second field effect transistor is a P-channel MOS transistor.

In some embodiments of the present utility model, the control module includes a first detection end and a second detection end, where the first detection end and the second detection end are connected to two ends of the output port, so as to detect the first electric quantity of the device to be charged.

In some embodiments of the present utility model, the control module includes a third detection end, a first detection resistor and a second detection resistor, where one end of the first detection resistor is connected to an anode conductive wire between the first field effect transistor and the access port, the other end of the first detection resistor is connected to the second detection resistor, and one end of the second detection power supply, which is away from the first detection resistor, is connected to the cathode conductive wire; the third detection end is connected between the first detection resistor and the second detection resistor.

In some embodiments of the present disclosure, the control module is connected to the access port, and the control module receives a charging signal of the access port to control the access port to switch on the output port.

In some embodiments of the present utility model, a positive conductive line and a negative conductive line are disposed between the access port and the output port, and the explosion-proof charging circuit further includes:

the filtering module comprises a first capacitor which is connected with two ends of the access port;

the amplifying module comprises a signal resistor, a feedback resistor, a sampling resistor, a load resistor and an amplifier, wherein the sampling resistor is arranged on the negative electrode conducting wire in series;

the non-inverting input end of the amplifier is connected with the first end of the sampling resistor, the inverting input end of the amplifier is connected with one end of the signal resistor, and the other end of the signal resistor is connected with the second end of the sampling resistor; the output end of the amplifier is connected with the control module, one end of the feedback resistor is connected between the sampling resistor and the signal resistor, and the other end of the feedback resistor is connected between the output end and the control module; one end of the load resistor is connected between the output end and the control module, and the other end of the load resistor is connected to the negative electrode conducting wire.

In a second aspect, the present utility model further provides an explosion-proof charging device, including a circuit board, where the explosion-proof charging circuit is integrated on the circuit board.

The utility model provides an explosion-proof charging circuit and a charging device, wherein the explosion-proof charging circuit comprises an access port for accessing input equipment, an output port for accessing equipment to be charged, a switch module and a control module, wherein the switch module is arranged between the access port and the output port and is used for controlling on/off between the access port and the output port; the input device is used for supplying power to the device to be charged; the control module is connected with the equipment to be charged and the switch module and is used for detecting first electric quantity of the equipment to be charged, and when the first electric quantity is larger than a first preset electric quantity, the control module controls the switch module to be disconnected so that the access port is disconnected with the output port; when the equipment to be charged is charged to the first preset electric quantity, the charging circuit is disconnected to prevent current from flowing backwards, so that electric leakage in the charging process of the equipment to be charged is avoided; the utility model is also provided with a plurality of first field effect transistors which are connected in series, and the charging circuit can be turned off only by turning off one of the plurality of first field effect transistors, thereby being beneficial to improving the explosion-proof safety.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a frame structure diagram of an explosion-proof charging circuit according to an embodiment of the present utility model;

fig. 2 is a circuit configuration diagram of an explosion-proof charging circuit according to an embodiment of the present utility model.

Main element symbol description: 100-access port, 200-switch module, 300-output port, 400-control module, 500-equipment to be charged, 600-input equipment, Q1-first sub-field effect transistor, Q2-second sub-field effect transistor, Q3-third sub-field effect transistor, Q4-second field effect transistor, R1-signal resistor, R2-feedback resistor, R3-sampling resistor, R4-load resistor, R5-second detection resistor, R6-first detection resistor, R7-first sub-bias resistor, R8-second sub-bias resistor, R9-third sub-bias resistor, R10-second bias resistor, C1-first capacitor and U1-amplifier.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. In the description of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as exemplary in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be understood by those of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

The current charging circuit is not provided with a charging protection structure, so that even after the charging circuit is fully charged, power supply can still be continued, and current backflow can possibly occur, so that a safety problem is caused. The utility model is based on the improvement of the current explosion-proof charging circuit and the charging device.

First, referring to fig. 1 and 2, fig. 1 shows a frame structure diagram of an explosion-proof charging circuit provided in an embodiment of the present utility model, and fig. 2 shows a circuit structure diagram of an explosion-proof charging circuit provided in an embodiment of the present utility model. The explosion-proof charging circuit comprises an access port 100, an output port 300, a switch module 200 and a control module 400.

The access port 100 is used to access an input device. That is, the access port 100 may be an interface for connecting to an input device, which may be mains or other power sources.

The output port 300 is used for accessing the device 500 to be charged, and the input device is used for supplying power to the device 500 to be charged. That is, the output port 300 may be an interface for connecting to the device 500 to be charged, and the device 500 to be charged may be an electronic device that needs to be charged by a mobile phone, a flashlight, a television, a refrigerator, etc. Positive and negative conductive lines are provided between the access port 100 and the output port 300. A charging loop can be formed.

And a switching module 200 disposed between the access port 100 and the output port 300 to control on/off between the access port 100 and the output port 300. That is, the switch module 200 may control the connection port 100 and the disconnection of the output port 300, and thus the disconnection between the input device and the device to be charged 500, when the input device cannot supply power to the device to be charged 500. The switch module 200 may also control the connection between the access port 100 and the output port 300, so that the input device and the device to be charged 500 are connected, and the input device may supply power to the device to be charged 500.

The switch module 200 includes a plurality of first field effect transistors, and the plurality of first field effect transistors are serially arranged on the positive electrode conductive wire; the control module 400 is connected to the device to be charged 500 and the switch module 200, and is configured to detect a first electric quantity of the device to be charged 500, and when the first electric quantity is greater than a first preset electric quantity, the control module 400 controls a plurality of first field effect transistors to be disconnected, so that the access port 100 is disconnected from the output port 300. That is, the control module 400 controls whether the first fet is turned off by detecting the amount of electricity of the device 500 to be charged, so as to control the on-off between the access port 100 and the output port 300. Even if one first field effect transistor is controlled to fail, the charging circuit can be turned off by controlling other first field effect transistors, so that the explosion-proof safety is ensured.

It can be appreciated that, when the device to be charged 500 is charged to the first preset electric quantity, the charging circuit is disconnected, so as to prevent current from flowing backward, and further avoid electric leakage in the charging process of the device to be charged 500. The input device is ensured to stably input the electric quantity into the device 500 to be charged in the charging process, and the electric quantity is not wasted. Has the advantages of saving electric energy and having good safety performance. The plurality of first field effect transistors are connected in series, and the charging circuit can be turned off only by turning off one of the plurality of first field effect transistors, so that the explosion-proof safety is improved.

In some embodiments of the present utility model, the first preset power is the power of the device 500 to be charged when fully charged. That is, when fully charged, the connection between the access port 100 and the output port 300 is broken.

In some embodiments, the first field effect transistor may be a MOS transistor or a triode. In another embodiment, the first fet may be replaced with a switch key.

In some embodiments of the present utility model, the switching module 200 further includes a second fet disposed between the control module 400 and the first fet, and configured to control on/off of the first fet in response to the control module 400.

In some embodiments, the second field effect transistor may be a MOS transistor or a triode. In another embodiment, the second fet may be replaced with a switch key.

In some embodiments of the present utility model, the first field effect transistors and the second field effect transistors are MOS transistors, the number of the first field effect transistors is at least two, and at least two first field effect transistors are serially arranged between the access port and the output port; the D electrode of the second field effect tube is connected with the G electrodes of at least two first field effect tubes, the S electrode of the second field effect tube is connected with the negative electrode conductive wire, and the G electrode of the second field effect tube is connected with the control module 400; the first bias resistor is arranged between the S pole of each first field effect tube and the G pole of each first field effect tube, and the second bias resistor is arranged between the S pole of each second field effect tube and the G pole of each second field effect tube.

In some embodiments of the present utility model, the first field effect transistor is an N-channel MOS transistor, and the second field effect transistor is a P-channel MOS transistor.

In some embodiments, the number of first field effect transistors is three, and the first sub-field effect transistor Q1, the second sub-field effect transistor Q2, and the third sub-field effect transistor Q3 are respectively. Correspondingly, the first bias resistor comprises a first sub bias resistor R7, a second sub bias resistor R8 and a third sub bias resistor R9.

In some embodiments of the present utility model, the control module 400 includes a first detection end and a second detection end, where the first detection end and the second detection end are connected to two ends of the output port 300, so as to detect the first electric quantity of the device to be charged.

In some embodiments of the present utility model, the control module 400 includes a third detection end, a first detection resistor R6, and a second detection resistor R5, where one end of the first detection resistor R6 is connected to a positive conductive line between the first field effect transistor and the access port 100, the other end is connected to the second detection resistor R5, and one end of the second detection power supply facing away from the first detection resistor R6 is connected to the negative conductive line; the third detection end is connected between the first detection resistor R6 and the second detection resistor R5.

In some embodiments of the present utility model, the control module 400 is connected to the access port 100, and the control module 400 receives a charging signal of the access port 100 to control the access port 100 to switch on the output port 300.

Specifically, the control module 400 is a chip U2, and when the device 500 to be charged needs to be charged, the chip U2 is fed back to the access port 100. At this time, the access port 100 starts to input electric energy, the U2 detects a communication signal of the access port 100 and a voltage signal at two ends of the load resistor, and the U2 port 3 outputs a high-level signal to control the first field effect transistor and the second field effect transistor to be turned on, so as to maintain a charging state. When the charge of the device 500 to be charged is full or the device 500 to be charged is not charged, the U2 timely turns off the first field effect transistor and the second field effect transistor by receiving the voltage signals at the two ends of the load resistor, so that the voltage at the two ends of the device 500 to be charged is prevented from flowing back to the direction of the input device.

In another embodiment, the current signals and other electrical signals at other positions can be detected, for example, the voltages at two ends of the first bias resistor of the first field effect transistor are detected, when the battery is fully charged and the circuit is cut off, the energy stored in the first field effect transistor in the charging process is consumed through the first bias resistor, and then the voltages at two ends of the first bias resistor are detected, so that the energy stored in the first field effect transistor in the charging process can be obtained.

In some embodiments of the present utility model, a positive conductive line and a negative conductive line are disposed between the access port 100 and the output port 300, and the explosion-proof charging circuit further includes:

the filtering module comprises a first capacitor C1, wherein the first capacitor C1 is connected to two ends of the access port 100;

the amplifying module comprises a signal resistor, a feedback resistor R2, a sampling resistor R3, a load resistor R4 and an amplifier U1, wherein the sampling resistor R3 is arranged on the negative electrode conducting wire in series;

the non-inverting input end of the amplifier U1 is connected to the first end of the sampling resistor R3, the inverting input end of the amplifier U1 is connected to one end of the signal resistor, and the other end of the signal resistor is connected to the second end of the sampling resistor R3; the output end of the amplifier U1 is connected with the control module 400, one end of the feedback resistor R2 is connected between the sampling resistor R3 and the signal resistor, and the other end is connected between the output end and the control module 400; one end of the load resistor R4 is connected between the output end and the control module 400, and the other end is connected to the negative electrode conductive wire.

It can be understood that the amplifying module collects the voltages at two ends of the sampling resistor R3, and the voltages at two ends of the sampling resistor R3 are stably amplified and output through the signal resistor, the amplifier U1 and the feedback resistor R2. The first capacitor C1 is advantageous in that the output voltage is more stable.

In some embodiments, the number of the first capacitors C1 may be plural to enhance the effect of capacitive filtering. The amplification module may also be replaced by a valve, a kawasaki diode, etc.

Further, in order to better implement the anti-explosion charging circuit in the embodiment of the utility model, the utility model further provides an anti-explosion charging device based on the anti-explosion charging circuit, wherein the anti-explosion charging device comprises a circuit board, and the anti-explosion charging circuit in any embodiment is integrated on the circuit board.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the utility model may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present utility model uses specific words to describe embodiments of the present utility model. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the utility model. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the utility model may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject utility model. Indeed, less than all of the features of a single embodiment disclosed above.

Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this utility model if the description, definition, and/or use of the term in the appended claims does not conform to or conflict with the present disclosure.

The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the principles and embodiments of the present utility model is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present utility model; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present utility model, the present description should not be construed as limiting the present utility model in summary.

Claims (10)

1. An explosion-proof charging circuit, comprising:

the access port is used for accessing the input equipment;

the input device is used for supplying power to the equipment to be charged; an anode conductive wire and a cathode conductive wire are arranged between the access port and the output port so as to form a charging loop;

the switch module is arranged between the access port and the output port to control on/off between the access port and the output port; the switch module comprises a plurality of first field effect transistors, and the first field effect transistors are arranged on the positive electrode conducting wire in series;

the control module is connected with the equipment to be charged and the switch module and is used for detecting first electric quantity of the equipment to be charged, and when the first electric quantity is larger than first preset electric quantity, the control module controls the disconnection of the plurality of first field effect transistors so that the access port is disconnected with the output port.

2. The explosion-proof charging circuit of claim 1, wherein the first preset electrical quantity is an electrical quantity when the device to be charged is fully charged.

3. The explosion-proof charging circuit of claim 1, wherein the switching module further comprises a second field effect transistor disposed between the control module and the first field effect transistor and configured to control on/off of the first field effect transistor in response to the control module.

4. The explosion-proof charging circuit of claim 3, wherein the first field effect transistor and the second field effect transistor are MOS transistors, the number of the first field effect transistors is at least two, and at least two first field effect transistors are arranged in series between the access port and the output port;

the D pole of the second field effect tube is connected with the G poles of at least two first field effect tubes, the S pole of the second field effect tube is connected with the negative electrode conductive wire, and the G pole of the second field effect tube is connected with the control module.

5. The explosion-proof charging circuit of claim 4, wherein the first field effect transistor is an N-channel MOS transistor and the second field effect transistor is a P-channel MOS transistor.

6. The explosion-proof charging circuit of claim 1, wherein the control module comprises a first detection end and a second detection end, the first detection end and the second detection end being terminated at two ends of the output port to detect the first power level of the device to be charged.

7. The explosion-proof charging circuit of claim 1, wherein the control module comprises a third detection end, a first detection resistor and a second detection resistor, wherein one end of the first detection resistor is connected to a positive electrode conductive wire between the first field effect transistor and the access port, the other end of the first detection resistor is connected to the second detection resistor, and one end of the second detection resistor, which is away from the first detection resistor, is connected to the negative electrode conductive wire; the third detection end is connected between the first detection resistor and the second detection resistor.

8. The explosion-proof charging circuit of claim 6, wherein the control module is coupled to the access port and the control module receives a charging signal from the access port to control the access port to turn on the output port.

9. The explosion-proof charging circuit of claim 1, wherein a positive conductive wire and a negative conductive wire are disposed between the access port and the output port, the explosion-proof charging circuit further comprising:

the filtering module comprises a first capacitor which is connected with two ends of the access port;

the amplifying module comprises a signal resistor, a feedback resistor, a sampling resistor, a load resistor and an amplifier, wherein the sampling resistor is arranged on the negative electrode conducting wire in series;

the non-inverting input end of the amplifier is connected with the first end of the sampling resistor, the inverting input end of the amplifier is connected with one end of the signal resistor, and the other end of the signal resistor is connected with the second end of the sampling resistor; the output end of the amplifier is connected with the control module, one end of the feedback resistor is connected between the sampling resistor and the signal resistor, and the other end of the feedback resistor is connected between the output end and the control module; one end of the load resistor is connected between the output end and the control module, and the other end of the load resistor is connected to the negative electrode conducting wire.

10. An explosion-proof charging device comprising a circuit board on which the explosion-proof charging circuit of any one of claims 1 to 9 is integrated.