CN219659412U - Driving circuit of three-terminal fuse and electronic equipment - Google Patents
Driving circuit of three-terminal fuse and electronic equipment Download PDFInfo
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- CN219659412U CN219659412U CN202320452050.8U CN202320452050U CN219659412U CN 219659412 U CN219659412 U CN 219659412U CN 202320452050 U CN202320452050 U CN 202320452050U CN 219659412 U CN219659412 U CN 219659412U
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Abstract
The utility model relates to a driving circuit of a three-terminal fuse and electronic equipment, wherein a first end of the three-terminal fuse is used for being connected with power supply equipment, a second end of the three-terminal fuse is used for being connected with electric equipment, and a third end of the three-terminal fuse is connected with the driving circuit; the driving circuit includes: the first end of the first switch circuit is connected with the third end of the three-end fuse; the first end of the second switch circuit is connected with the second end of the first switch circuit, and the second end of the second switch circuit is connected with the second grounding end; the control circuit is respectively connected with the control ends of the first switch circuit and the second switch circuit and is used for respectively sending a first control signal and a second control signal to the first switch circuit and the second switch circuit so as to control the on-off of the first switch circuit and the second switch circuit. The scheme of the utility model can replace the traditional connection mode of the break point and the jump cap, can simplify the working procedure of the three-terminal fuse when leaving the factory, and improves the safety performance of products.
Description
Technical Field
The present utility model relates to the field of fuse technologies, and in particular, to a driving circuit for a three-terminal fuse and an electronic device.
Background
The three terminal fuse may be used for secondary protection of the battery. In the related art, a third end of the three-end fuse is connected with a driving end of the three-end fuse by using a breakpoint or a jump cap, when the three-end fuse is tested before delivery, the breakpoint or the jump cap is required to be disconnected, when the test is completed and delivery is carried out, the breakpoint or the jump cap is required to be connected in a welding mode or the like, so that when the three-end fuse triggers overvoltage protection, the control end controls the three-end fuse to burn off, and secondary protection is triggered.
However, in actual use, when the test is completed and delivery is carried out, the break point and the jump cap of the three-terminal fuse are required to be welded, and the procedure is complicated; and the break points of the three-terminal fuses and the skip caps are easy to cause poor welding, skip welding and skip cap installation, so that the three-terminal fuses leaving the factory can not trigger overvoltage protection, the reliability of products is adversely affected, and the safety performance of the products is low.
Disclosure of Invention
The utility model discloses a driving circuit of a three-terminal fuse and electronic equipment, which solve the problem that overvoltage protection cannot be triggered due to the fact that poor welding, missing welding and missing installation of a jump cap easily occur after the three-terminal fuse leaves a factory.
In a first aspect, the present utility model provides a driving circuit of a three-terminal fuse, where a first end of the three-terminal fuse is used for connecting with a power supply device, a second end of the three-terminal fuse is used for connecting with an electric device, and a third end of the three-terminal fuse is connected with the driving circuit; the provided driving circuit includes:
a first switch circuit, wherein a first end of the first switch circuit is connected with a third end of the three-terminal fuse;
the first end of the isolation circuit is connected with the second end of the first switch circuit, and the second end of the isolation circuit is connected with the first grounding end;
the first end of the second switch circuit is connected with the second end of the first switch circuit, and the second end of the second switch circuit is connected with the second grounding end;
the control circuit is respectively connected with the control end of the first switch circuit and the control end of the second switch circuit and is used for sending a first control signal to the first switch circuit so as to control the on-off of the first switch circuit and sending a second control signal to the second switch circuit so as to control the on-off of the second switch circuit.
In a second aspect, the present utility model provides an electronic device including a three-terminal fuse and the driving circuit of the three-terminal fuse provided in the first aspect.
The utility model provides a driving circuit of a three-terminal fuse and electronic equipment. When the three-terminal fuse is not delivered from the factory, the control circuit controls the first switch circuit to be switched off, and meanwhile, the three-terminal fuse can be prevented from being blown out due to overvoltage when delivered from the factory without welding a breakpoint or jumping a cap. When the three-terminal fuse leaves the factory, the first switch circuit is controlled to be conducted through the control circuit, and when the three-terminal fuse is overvoltage, the three-terminal fuse can be blown to complete overvoltage protection. Therefore, the utility model uses the first switch circuit to replace the breakpoint and the jump cap, does not need the welding process when leaving the factory, simplifies the process when leaving the factory of the three-terminal fuse, and uses the control circuit to control the first switch circuit to be conducted after leaving the factory, so that the problem of the safety performance of the three-terminal fuse caused by missing welding and the like can be avoided, and the safety performance of the product can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, 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 driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 8 is a schematic diagram of another driving circuit of a three-terminal fuse according to an embodiment of the present utility model;
FIG. 9a is a schematic diagram of an isolated driving circuit according to an embodiment of the present utility model;
FIG. 9b is a schematic diagram of an isolated driving circuit according to an embodiment of the present utility model;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present utility model.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. 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 be within the scope of the utility model.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that, in order to clearly describe the technical solutions of the embodiments of the present utility model, in the embodiments of the present utility model, the words "first", "second", etc. are used to distinguish identical items or similar items having substantially the same function and effect. For example, the first recognition model and the second recognition model are merely for distinguishing between different callback functions, and are not limited in their order of precedence. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In order to facilitate understanding of the embodiments of the present utility model, some words related to the embodiments of the present utility model are briefly described below.
1. Three-terminal fuse: the three-terminal fuse can be used for secondary protection of a battery and has the advantages of small impedance, low power consumption, simple design, high reaction speed and the like. The three-terminal fuse comprises three terminals, wherein two terminals are connected in series by a fuse formed by alloy metal, the fuse can be fused when overcurrent or short-circuit fault occurs, a cut-off circuit plays a role in protecting, a heater is connected in series at the middle third terminal, the function of the three-terminal fuse is to form a series loop with a switch circuit in the circuit, and when the system detects overvoltage of power supply equipment, the system starts heating by conducting the heater, so that the fuse is blown, and the overvoltage protection effect is achieved
2. Breakpoint/jump cap: when the three-terminal fuse is subjected to factory testing, the connection between the third terminal of the three-terminal fuse and the switch circuit is required to be disconnected, and the three-terminal fuse is prevented from being fused when overvoltage testing is performed on power supply equipment in the factory testing, and after the testing is finished, the breakpoint/jump cap is welded again to connect the third terminal of the three-terminal fuse and the switch circuit in the factory.
Some embodiments of the present utility model are described in detail below. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the actual factory process, if each three-terminal fuse is welded with break points/jump caps one by one, welding failure, missing welding and missing installation jump caps are easy to occur while huge workload is brought, and then the three-terminal fuse 10 after factory is caused to not trigger overvoltage protection, adverse effects are generated on the reliability of products, and the safety performance of the products is low.
The conventional three terminal fuse driving circuit structure is shown in fig. 1. In fig. 1, the switching circuit is used for receiving a control signal to conduct when the power supply device 30 is over-voltage, forming a heating loop with the three-terminal fuse 10, and fusing the three-terminal fuse 10 to realize over-voltage protection of the power supply device 30. When the power supply device 30 is subjected to the overvoltage test, the switch circuit receives the control signal to conduct and blow the three-terminal fuse 10, so that the switch circuit is disconnected from the third terminal of the three-terminal fuse 10 during the factory test, and the switch circuit is connected with the third terminal of the three-terminal fuse 10 through the break point/jump cap during the factory test.
It should be noted that, in the embodiment provided by the present utility model, the power supply device 30 may be any power output device, for example, may be a commercial power, solar energy, or a battery pack. The specific category is not limited by the present embodiment and the drawings.
In order to solve the problem that overvoltage protection cannot be triggered due to the fact that a break point and a jump cap are installed after the three-terminal fuse 10 leaves a factory and poor welding, welding leakage and jump cap installation are easy to occur, the utility model provides a driving circuit of the three-terminal fuse 10. Referring to fig. 2, fig. 2 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to the present utility model.
In the embodiment of the present utility model, a first end of the three-terminal fuse 10 is used for connecting to the power supply device 30, a second end of the three-terminal fuse 10 is used for connecting to the electric device 40, and a third end of the three-terminal fuse 10 is connected to the driving circuit 20. The driving circuit 20 of the three-terminal fuse 10 includes a first switch circuit 21, an isolation circuit 22, a second switch circuit 23 and a control circuit 24. A first terminal of the first switch circuit 21 is connected to a third terminal of the three-terminal fuse 10. The first end of the isolation circuit 22 is connected to the second end of the first switch circuit 21, and the second end of the isolation circuit 22 is connected to the first ground. The first end of the second switch circuit 23 is connected to the second end of the first switch circuit 21, and the second end of the second switch circuit 23 is connected to the second ground. The control circuit 24 is connected to the control end of the first switch circuit 21 and the control end of the second switch circuit 23, and is configured to send a first control signal to the first switch circuit 21 to control the on-off of the first switch circuit 21, and send a second control signal to the second switch circuit 23 to control the on-off of the second switch circuit 23.
Specifically, by connecting the first switch circuit 21 between the second switch circuit 23 and the third terminal of the three-terminal fuse 10, the first switch circuit 21 is turned off after receiving the first control signal in the factory test, thereby avoiding the three-terminal fuse 10 from being blown out due to overvoltage in the factory test. According to the embodiment of the utility model, the first switch circuit 21 is used for replacing the breakpoint and the jump cap, the welding process is not needed when the three-terminal fuse 10 leaves the factory, the process when the three-terminal fuse 10 leaves the factory is simplified, and the scheme provided by the embodiment of the utility model controls the conduction of the first switch circuit 21 by using the control circuit 24 after leaving the factory, so that the problem of the safety performance of the three-terminal fuse 10 caused by missing welding and the like is avoided, and the safety performance of a product can be improved.
In some embodiments, the control circuit 24 employs a micro control unit (Microcontroller Unit, MCU) capable of ensuring that the second control signal can be timely sent to turn on the second switching circuit 23 when the power supply device generates overvoltage according to the change of the voltage of the third terminal of the three-terminal fuse 10, so as to blow the three-terminal fuse 10.
For example, in some embodiments, the power supply device may be an energy storage device, where the MCU is a master control chip of the energy storage device, and in some embodiments, the power supply device may be a battery pack, where the MCU is a control chip in a battery management system (Battery Management System, BMS) of the battery pack.
In some embodiments, the first control signal includes a first on signal and a first off signal; the second control signal includes a second on signal and a second off signal. The control circuit 24 is further configured to send a first turn-off signal to the first switch circuit 21 to control the first switch circuit 21 to turn off when the three-terminal fuse 10 is in the test state. The control circuit 24 is further configured to send a first conduction signal to the first switch circuit 21 to control the first switch circuit 21 to conduct when the three-terminal fuse 10 is not in the test state. The control circuit 24 is further configured to output a second on signal to control the second switch circuit 23 to be turned on when the voltage of the power supply device 30 is equal to or greater than a preset threshold. The control circuit 24 is further configured to output a second off signal to control the second switching circuit 23 to be turned off when the voltage of the power supply apparatus 30 is less than a preset threshold.
When the three-terminal fuse 10 is in the test state, the control circuit 24 turns off the first switching circuit 21 by sending a first turn-off signal to the first switching circuit 21. When the three-terminal fuse 10 is not in the test state, a first conduction signal is sent to the first switch circuit 21 to conduct the first switch circuit 21. The control circuit 24 sends the first turn-off signal and the first turn-on signal to the first switch circuit 21, so that the connection between the second switch circuit 23 and the third terminal of the three-terminal fuse 10 is not required to be disconnected when the three-terminal fuse 10 is in a test state, the factory process of the three-terminal fuse 10 can be greatly simplified, and various tests can be conveniently carried out on the three-terminal fuse.
The control circuit 23 compares the voltage of the power supply device 30 with a preset threshold value, and when the voltage of the power supply device 30 is greater than or equal to the preset threshold value, the control circuit 24 sends a second conduction signal to the second switch circuit 23 to conduct the second switch circuit 23; when the voltage of the power supply device 30 is less than the preset threshold, the control circuit 24 sends a second turn-off signal to the second switching circuit 23 to turn off the second switching circuit 23; by conducting the second switch circuit 23 when the voltage of the power supply device 30 is greater than or equal to the preset threshold, the three-terminal fuse 10, the first switch circuit 21 and the second switch circuit 23 can form a heating loop to fuse the three-terminal fuse 10, thereby realizing overvoltage protection of the power supply device 30.
Fig. 3 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to another embodiment of the present utility model. In fig. 3, the first switch circuit 21 includes a first switch unit 211 and a first filter unit 212, and the second switch circuit 23 includes a second switch unit 231 and a second filter unit 232. The first end of the first switch unit 211 is connected to the third end of the three-terminal fuse 10, the second end of the first switch unit 211 is connected to the first end of the isolation circuit 22, the second end of the first switch unit 211 is also connected to the first end of the second switch unit 231, and the control end of the first switch unit 211 is connected to the control circuit 24 and is configured to receive the first control signal sent by the control circuit 24. The first end of the first filter unit 212 is connected between the control circuit 24 and the control end of the first switch unit 211, the second end of the first filter unit 212 is connected to the first ground end, and the second end of the first filter unit 212 is also connected to the second end of the isolation circuit 22. The first end of the second switch unit 231 is connected to the second end of the first switch unit 211, the second end of the second switch unit 231 is connected to the second ground, and the control end of the second switch unit 231 is connected to the control circuit 24 and is configured to receive the second control signal sent by the control circuit 24. The first end of the second filter unit 232 is connected between the control circuit 24 and the control end of the second switch unit 231, and the second end of the second filter unit 232 is connected between the second ground end and the second end of the second switch unit 231.
The control circuit 24 sends the first control signal and the second control signal to control the on-off of the first switch unit 211 and the second switch unit 231 respectively, so that the first switch unit 211 is disconnected when the three-terminal fuse 10 is in a test state, the first switch unit 211 is conducted when the three-terminal fuse leaves a factory, at this time, when the voltage of the power supply equipment 30 is greater than a preset voltage, the second switch unit 231 is conducted, and then the three-terminal fuse 10, the first switch unit 211 and the second switch unit 231 form a heating loop to fuse the three-terminal fuse 10.
The first filtering unit 212 is configured to filter the first control signal input to the first switching unit 211 by the control circuit 24, so as to avoid misleading on/off of the first switching unit 211; the second filtering unit 232 is configured to filter the second control signal input to the second switching unit 231 by the control circuit 24, so as to avoid misleading on/off of the second switching unit 231.
Fig. 4 is a schematic diagram of a driving circuit 20 of another three-terminal fuse 10 according to another embodiment of the present utility model. In fig. 4, the first switching unit 211 includes a first switching tube Q 1 The first filter unit 212 includes a first resistor R 1 And a first capacitor C 1 The second switching unit 231 includes a second switching transistor Q 2 The second filter unit 232 includes a second resistor R 2 Second capacitor C 2 . First switch tube Q 1 A first switch tube Q connected to the third terminal of the three-terminal fuse 10 1 A first switch tube Q connected to the first end of the isolation circuit 22 1 A second switch tube Q is also connected with the second end of 2 First end of a first switch tube Q 1 A control terminal connected to the control circuit 24 for receiving a first control signal sent by the control circuit 24 to control the first switch tube Q 1 Is provided. First resistor R 1 Is connected to the control circuit 24 and the first switch tube Q 1 Between the control terminals of (a) a first resistor R 1 A second end of the resistor is connected with the first grounding end, and a first resistor Q 1 A second terminal of the isolation circuit 22, a first capacitor C 1 And a first resistor R 1 And are connected in parallel. Second switch tube Q 2 Is connected with the first switch tube Q 1 A first switch tube Q 1 A second end of the second switch tube Q is connected with a second grounding end 2 The control terminal of (2) is connected to the control circuit 24 for receiving a second control signal sent by the control circuit 24 to control the second switch tube Q 2 Is connected with the power supply; second resistor R 2 Is connected to the control circuit 24 and the second switch tube Q 2 Between the control terminals of (2), a second resistor R 2 Is connected with the second grounding end and the second switch tube Q 2 A second capacitor C between the second ends of 2 And a second resistor R 2 And are connected in parallel.
Exemplary, in some embodiments, a first switching tube Q 1 Can be NMOS tube, the first switch tube Q 1 May be PMOS transistors. Q is controlled by control circuit 24 1 Can realize Q to the base electrode of (2) 1 Control of on and off, Q 1 The specific type of the first switch tube Q is not limited by the embodiment of the utility model and the drawings 1 The type of (c) is not limited.
As shown in fig. 4, when the first switching tube Q 1 When the transistor is NMOS, Q 1 The first end of the transistor is a source electrode S, the second end is a drain electrode D, the control end is a base electrode G, and the first switching tube Q is changed 1 Can realize the first switch tube Q 1 On and off of the power supply.
Exemplary, in some embodiments, the second switching tube Q 2 Can be NMOS tube, the second switch tube Q 2 May be PMOS transistors. Q is controlled by control circuit 24 2 Can realize Q to the base electrode of (2) 2 Control of on and off, Q 2 The specific type of the second switch tube Q is not limited by the embodiment of the utility model and the drawings 2 The type of (c) is not limited.
Exemplary, in some embodiments, as shown in FIG. 4, the second switching tube Q 2 Is NMOS tube, Q 2 The first end of the transistor is a drain electrode D, the second end is a source electrode S, the control end is a base electrode G, and the second switching tube Q is changed 2 Can realize the second switch tube Q 2 On and off of the power supply.
Exemplary, in some embodiments, as shown in FIG. 4, the first switching circuit 21 further includes a first current limiting resistor R 3 A first current limiting resistor R 3 A first end of the first switch unit 211 is connected with a control end of the first current-limiting resistor R 3 Is connected to a first end of the first filter unit 212. By incorporating a first current limiting resistor R in the first switching circuit 21 3 It is possible to avoid the first switching unit 211 from being burned out.
Exemplary, in some embodiments, as shown in FIG. 4, the second switching circuit 23 includes a second current limiting resistor R 4 A second current limiting resistor R 4 A first terminal of the second switch unit 231 is connected to the control terminal of the second current-limiting resistor R 4 Is connected to the first end of the second filtering unit 232. By incorporating a second current limiting resistor R in the second switching circuit 23 4 The second switching unit 231 can be prevented from being burned out.
Exemplary, in some embodiments, as shown in FIG. 4, the first switching circuit 21 further includes a first current limiting resistor R 3 A first current limiting resistor R 3 A first end of the first switch unit 211 is connected with a control end of the first current-limiting resistor R 3 Is connected to the first end of the first filter unit 212; in some embodiments; the second switching circuit 23 includes a second current limiting resistor R 4 A second current limiting resistor R 4 A first terminal of the second switch unit 231 is connected to the control terminal of the second current-limiting resistor R 4 Is connected to the first end of the second filtering unit 232. By adding a first current limiting resistor R in the first switching circuit 21 and the second switching circuit 23 3 And a second current limiting resistor R 4 The first and second switching units 211 and 231 can be prevented from being burned out.
In some embodiments, as shown in fig. 5, fig. 5 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to an embodiment of the present utility model. In fig. 5, the driving circuit 20 includes a test circuit 25, the test circuit 25 is connected in parallel with the first switch circuit 21 for testing the three-terminal fuse 10 when the three-terminal fuse 10 is in a test state
Since the first switch circuit 21 is in the off state during the test stage, if the second switch circuit 23 can be normally turned on or off when the overvoltage is desired to be tested at this time, the test circuit 25 can be connected in parallel to both ends of the first switch circuit 21, and by making the test circuit 25 have a larger resistance, it is possible to test the three-terminal fuse 10 while ensuring that the heating loop current formed by the second switch circuit 23 being turned on when the overvoltage occurs is smaller, which is insufficient to blow the three-terminal fuse 10.
It should be noted that, as shown in fig. 6, fig. 6 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to an embodiment of the present utility model. In fig. 6, the test circuit 25 includes a test resistor R 4 ，R 4 And Q is equal to 1 In parallel, can be at Q 1 If the three-terminal fuse 10 is over-voltage during disconnection, Q is caused 2 On due to R 4 The circuit current formed at this time is smaller because of the larger resistance, so that the overvoltage detection of the three-terminal fuse 10 can be completed and the three-terminal fuse 10 is prevented from being burnt.
In some embodiments, as shown in fig. 7, fig. 7 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to an embodiment of the present utility model. In fig. 7, the first switching circuit 21 includes a first voltage stabilizing unit 213, the second switching circuit 23 includes a second voltage stabilizing unit 233, and the first voltage stabilizing unit 213 is connected in parallel with the first filtering unit 212; the second voltage stabilizing unit 233 is connected in parallel with the second filtering unit 232. The inputs of the first filter unit 212 and the second filter unit 232 can be stabilized by the arrangement of the first voltage stabilizing unit 213 and the second voltage stabilizing unit 233.
It should be noted that, in some embodiments, as shown in fig. 4, the first voltage stabilizing unit 213 and the second voltage stabilizing unit 233 are first diodes D 1 And a second diode D 2 When D 1 And D 2 When broken down, the bleeder circuits of the first switch unit 211 and the second switch unit 231 can be respectively formed. Specifically, the isolation circuit 22 is connected between the second terminal of the first switch circuit 21 and the first ground terminal, so as to avoid that the second switch circuit 23 is turned on when the power supply device 30 is over-voltage during use, so that the first ground terminal and the second ground terminal are connected together. In some embodiments, e.g.As shown in fig. 4, the isolation circuit 22 includes a diode D 1 ，D 3 Is connected to the second end of the first switch circuit 211, diode D 3 Is connected to the first ground terminal. Through diode D 3 The arrangement of (2) can avoid the first ground terminal and the second ground terminal from being connected to each other when the second switch circuit 23 is turned on, thereby protecting the safety of the circuit.
In some embodiments, as shown in fig. 8, fig. 8 is a schematic diagram of a driving circuit 20 of a three-terminal fuse 10 according to an embodiment of the present utility model. In fig. 8, the driving circuit 20 further includes an isolation driving circuit 26, a control end of the isolation driving circuit 26 is connected to the control circuit 24, a first end of the isolation driving circuit 26 is connected to a control end of the first switch circuit 23, and the isolation driving circuit 26 is configured to isolate a first control signal output by the control circuit 24 and output the first control signal to the first switch circuit 21.
It should be noted that, in some embodiments, as shown in fig. 9a, fig. 9a is a schematic diagram of an isolated driving circuit 26 according to an embodiment of the present utility model, in fig. 9a, the isolated driving circuit 26 includes an isolated power supply and a switching tube Q 3-7 Diode D 4-8 And resistance R 5-13 . Wherein, switch tube Q 3 Gate connection control current 24, switch tube Q 3 The source electrode of (2) is connected with the second grounding terminal, the switch tube Q 3 Wherein the resistor R is connected with an isolated power supply 5 Is connected with a switch tube Q 3 For limiting current, resistor R between gate and control circuit 24 6 Is connected with a switch tube Q 3 For voltage division, avoiding switching tube Q 3 Is a malfunction of (1). When the three-terminal fuse 10 leaves the factory, the control circuit 24 always sends a high-level signal to control the switch tube Q 3 Conduction and switch tube Q 3 After conduction, the electric energy of the isolated power supply can pass through the resistor R 8 Diode D 2 And a switching tube Q 3 Reaching the second grounding end; the electric energy of the isolated power supply can also pass through the resistor R 7 Diode D 4 And a switching tube Q 3 To the second ground, so that the switching tube Q 4 The conduction is impossible; the electric energy of the isolated power supply can also pass through the resistor R 11 Resistance R 10 Resistance R 8 Diode D 2 And a switching tube Q 3 To the second ground, so that the switching tube Q 5 The B pole of (2) is low, so the switch tube Q 5 Conducting. Thus, in the switching tube Q 4 Cut-off and switch tube Q 5 When conducting, the electric energy of the isolated power supply can pass through the resistor R 11 Switch tube Q 5 Reach switch tube Q 6 So that the switching tube Q 6 On, and switch tube Q 7 Cut off, then from switch tube Q 6 The E pole of (c) outputs a high level signal, which controls the first switch circuit 21 to be turned on. When the product leaves the factory, the control circuit 24 always sends a low-level signal, so that the switch tube Q 3 Cut-off, the electric energy of the isolated power supply can pass through the resistor R 11 And resistance R 10 Reach switch tube Q 5 B pole of (C) such that switch tube Q 5 The cut-off is made. The electric energy of the isolated power supply can also pass through the resistor R 8 And diode D 3 Reach switch tube Q 4 G pole of (C) so that switch tube Q 4 Then conduct. Due to the switching tube Q 5 Cut off, thus, reach the switching tube Q 6 And a switching tube Q 7 The B pole is low level, so that the triode switch tube Q 6 Cut-off, switch tube Q 7 On, thus passing through the switching tube Q 6 The E-pole output of (2) is also low, which controls the first switching circuit 21 to be always off. The role of each diode in fig. 9a is mainly to separate the first ground terminal and the second ground terminal connected to the first switch circuit 21, and the first ground terminal and the second ground terminal are not connected together during operation.
In some embodiments, as shown in fig. 9b, fig. 9b is a schematic diagram of an isolation switch circuit 26 according to an embodiment of the present utility model, in fig. 9b, an isolation power supply may be implemented by using a transformer T1, and after the transformer T1 converts a power supply VCC of the MCU into an isolation power supply, the isolation power supply is provided to the isolation switch circuit 23 corresponding to fig. 9 a.
The utility model provides a driving circuit of a three-terminal fuse, which controls a first switch circuit to be disconnected through a control circuit when the three-terminal fuse is not delivered, and can avoid the three-terminal fuse from being blown out due to overvoltage when delivered without welding a breakpoint or jumping a cap. When the three-terminal fuse leaves the factory, the first switch circuit is controlled to be conducted through the control circuit, and when the three-terminal fuse is overvoltage, the three-terminal fuse can be blown to complete overvoltage protection. Therefore, the utility model uses the first switch circuit to replace the breakpoint and the jump cap, does not need the welding process when leaving the factory, simplifies the process when leaving the factory of the three-terminal fuse, and uses the control circuit to control the first switch circuit to be conducted after leaving the factory, so that the problem of the safety performance of the three-terminal fuse caused by missing welding and the like can be avoided, and the safety performance of the product can be improved.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an electronic device 200 according to an embodiment of the utility model. As shown in fig. 10, the electronic apparatus 200 includes: three-terminal fuse 10 and driving circuit 20. The driving circuit 20 is used for driving the three-terminal fuse 10 during operation, and can timely start overvoltage protection when the power supply equipment is in overvoltage, so as to blow the three-terminal fuse 10.
In some embodiments, the electronic device may be a power supply device or an energy storage device, and the present embodiment does not limit the type of electronic device.
In some embodiments, the drive circuit 20 may be configured with reference to the examples of fig. 1-9 b. For example, the driving circuit 20 includes the first switch circuit 21, the isolation circuit 22, the second switch circuit 23, and the control circuit 24 described in the above embodiments, and the specific arrangement of the driving circuit 20 can refer to the corresponding embodiments described in the present specification, which are not repeated here.
The embodiment of the utility model provides electronic equipment, which comprises a three-terminal fuse and a driving circuit thereof, wherein the driving circuit is used for driving the three-terminal fuse when in operation, and overvoltage protection can be started in time when power supply equipment is in overvoltage so as to fuse the three-terminal fuse. By controlling the first switch circuit in the three-terminal fuse to be conducted after leaving the factory, the electronic equipment provided by the utility model avoids the problem of the safety performance of the three-terminal fuse caused by missing welding and the like, and further improves the safety performance of the electronic equipment.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (10)
1. The driving circuit of the three-terminal fuse is characterized in that a first end of the three-terminal fuse is used for being connected with power supply equipment, a second end of the three-terminal fuse is used for being connected with electric equipment, and a third end of the three-terminal fuse is connected with the driving circuit; the driving circuit includes:
a first switch circuit, wherein a first end of the first switch circuit is connected with a third end of the three-terminal fuse;
the first end of the isolation circuit is connected with the second end of the first switch circuit, and the second end of the isolation circuit is connected with the first grounding end;
the first end of the second switch circuit is connected with the second end of the first switch circuit, and the second end of the second switch circuit is connected with the second grounding end;
the control circuit is respectively connected with the control end of the first switch circuit and the control end of the second switch circuit and is used for sending a first control signal to the first switch circuit so as to control the on-off of the first switch circuit and sending a second control signal to the second switch circuit so as to control the on-off of the second switch circuit.
2. The drive circuit of claim 1, wherein the first control signal comprises a first on signal and a first off signal; the second control signal comprises a second on signal and a second off signal; the control circuit is further used for sending the first turn-off signal to the first switch circuit when the three-terminal fuse is in a test state so as to control the first switch circuit to be turned off;
the control circuit is further configured to send the first conduction signal to the first switch circuit to control the first switch circuit to be turned on when the three-terminal fuse is not in a test state;
the control circuit is further used for outputting a second conduction signal to control the second switching circuit to be conducted when the voltage of the power supply equipment is larger than or equal to a preset threshold value;
the control circuit is also used for outputting a second disconnection signal when the voltage of the power supply equipment is smaller than a preset threshold value so as to control the second switching circuit to be disconnected.
3. The driving circuit according to claim 1, wherein the first switching circuit includes a first switching unit and a first filtering unit, and the second switching circuit includes a second switching unit and a second filtering unit;
the first end of the first switch unit is connected with the third end of the three-end fuse, the second end of the first switch unit is connected with the first end of the isolation circuit, the second end of the first switch unit is also connected with the first end of the second switch unit, and the control end of the first switch unit is connected with the control circuit and is used for receiving the first control signal sent by the control circuit;
the first end of the first filtering unit is connected between the control circuit and the control end of the first switch unit, the second end of the first filtering unit is connected with the first grounding end, the second end of the first filtering unit is also connected with the second end of the isolation circuit, and the first filtering unit is used for filtering the first control signal output by the control circuit;
the second end of the second switch unit is connected with the second grounding end, and the control end of the second switch unit is connected with the control circuit and is used for receiving the second control signal sent by the control circuit;
the first end of the second filtering unit is connected between the control circuit and the control end of the second switching unit, the second end of the second filtering unit is connected between the second grounding end and the first end of the second switching unit, and the second filtering unit is used for filtering the second control signal output by the control circuit.
4. A driving circuit according to claim 3, wherein the first switching unit comprises a first switching tube, the first filtering unit comprises a first resistor and a first capacitor, the second switching unit comprises at least a second switching tube, and the second filtering unit comprises at least a second resistor and a second capacitor;
the first end of the first switching tube is connected with the third end of the three-end fuse, the second end of the first switching tube is connected with the first end of the isolation circuit, the second end of the first switching tube is also connected with the first end of the second switching tube, and the control end of the first switching tube is connected with the control circuit;
the first end of the first resistor is connected between the control circuit and the control end of the first switch tube, the second end of the first resistor is connected with the first grounding end, the second end of the first resistor is also connected with the second end of the isolation circuit, and the first capacitor is connected in parallel with the first resistor;
the first end of the second switching tube is connected with the second end of the first switching tube, the second end of the second switching tube is connected with the second grounding end, and the control end of the second switching tube is connected with the control circuit;
the first end of the second resistor is connected between the control circuit and the control end of the second switching tube, the second end of the second resistor is connected between the second grounding end and the second end of the second switching tube, and the second capacitor is connected in parallel with the second resistor.
5. The driving circuit according to claim 4, wherein,
the first switch unit further comprises a first current limiting resistor, a first end of the first current limiting resistor is connected with the control end of the first switch tube, and a second end of the first current limiting resistor is connected with the control circuit; and/or
The second switch unit comprises a second current limiting resistor, a first end of the second current limiting resistor is connected with the control end of the second switch tube, and a second end of the second current limiting resistor is connected with the control circuit.
6. The drive circuit of claim 3, wherein the first switching circuit further comprises a first voltage stabilizing unit, and the second switching unit further comprises a second voltage stabilizing unit;
the first voltage stabilizing unit is connected with the first filtering unit in parallel;
the second voltage stabilizing unit is connected with the second filtering unit in parallel.
7. The drive circuit of claim 1, wherein the isolation circuit comprises a diode, an anode of the diode being connected to the second terminal of the first switching circuit, and a cathode of the diode being connected to the first ground terminal.
8. The drive circuit according to claim 2, characterized in that the drive circuit comprises:
and the test circuit is connected with the first switch circuit in parallel and is used for conducting when the three-terminal fuse is in the test state so as to test the three-terminal fuse.
9. The driving circuit according to any one of claims 1 to 8, further comprising an isolation driving circuit, wherein a control end of the isolation driving circuit is connected to the control circuit, a first end of the isolation driving circuit is connected to a control end of the first switch circuit, and the isolation driving circuit is configured to isolate the first control signal output by the control circuit and output the first control signal to the first switch circuit.
10. An electronic device comprising a three-terminal fuse and a driving circuit of the three-terminal fuse according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320452050.8U CN219659412U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of three-terminal fuse and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320452050.8U CN219659412U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of three-terminal fuse and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219659412U true CN219659412U (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320452050.8U Active CN219659412U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of three-terminal fuse and electronic equipment |
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| Country | Link |
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| CN (1) | CN219659412U (en) |
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2023
- 2023-02-28 CN CN202320452050.8U patent/CN219659412U/en active Active
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Address after: 518000 Factory Building 401, Runheng Industrial Plant 1, Fuyuan Road, Zhancheng Community, Fuhai Street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, Building E, Jiehe Industrial City, Shuitian Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region before: China |