CN211428908U - Overcurrent protection circuit, converter and power supply network - Google Patents
Overcurrent protection circuit, converter and power supply network Download PDFInfo
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- CN211428908U CN211428908U CN201922359839.5U CN201922359839U CN211428908U CN 211428908 U CN211428908 U CN 211428908U CN 201922359839 U CN201922359839 U CN 201922359839U CN 211428908 U CN211428908 U CN 211428908U
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Abstract
The embodiment of the utility model discloses overcurrent protection circuit, converter and power supply network relates to power electronic technology field. The overcurrent protection circuit includes: the output end of the current detection unit circuit is connected with the voltage comparison unit circuit, and the output end of the voltage comparison unit circuit is connected with the switch driving unit circuit; the current detection unit circuit is connected in the circuit loop in series and used for detecting the current in the loop, converting a current signal into a voltage signal and sending the voltage signal to the voltage comparison unit circuit; the voltage comparison unit circuit is used for receiving and comparing the voltage signal and sending a driving control signal to the switch driving unit circuit; and the switch driving unit circuit is an electronic switch which is used for receiving the driving control signal and controlling the on-off of the loop according to the driving control signal. By connecting the overcurrent protection circuit in a loop with the silicon carbide MOSFET, the silicon carbide MOSFET can be effectively protected.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to an overcurrent protection circuit, converter and supply network.
Background
Silicon carbide MOSFETs (Metal-Oxide-Semiconductor Field Effect transistors, abbreviated as MOSFETs) are widely used in the Field of power electronics due to their higher voltage resistance, heat resistance, faster conductivity, and lower loss. Particularly in the field of current converters, the current converter can realize the conversion of AC \ DC and DC \ AC, and has high requirements on conversion efficiency and harmonic waves, so the current converter is often applied to silicon carbide MOSFETs.
Utility model people are realizing the utility model discloses the in-process of creating discovers: although the current silicon carbide MOSFET can achieve the voltage resistance of 1700V, the main disadvantage is easy overcurrent damage. As a main power device, once the overcurrent is damaged, the normal operation of the equipment can be greatly influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides an overcurrent protection circuit, converter and power supply network can effectively protect silicon carbide MOSFET to guarantee the reliable and stable operation of converter and power supply network.
In order to achieve the above object, an embodiment of the present invention provides an overcurrent protection circuit, include: the output end of the current detection unit circuit is connected with the voltage comparison unit circuit, and the output end of the voltage comparison unit circuit is connected with the switch driving unit circuit;
the current detection unit circuit is connected in series in the circuit loop and used for detecting the current in the loop, converting a current signal into a voltage signal and sending the voltage signal to the voltage comparison unit circuit;
the voltage comparison unit circuit is used for receiving the voltage signal, comparing the voltage signal and sending a driving control signal to the switch driving unit circuit;
and the switch driving unit circuit is an electronic switch which is used for receiving the driving control signal and controlling the on-off of the loop according to the driving control signal.
Optionally, the current detection unit circuit includes a closed-loop hall current sensor and a resistor, an output end of the closed-loop hall current sensor is connected with one end of the resistor, the other end of the resistor is grounded, and the resistor is used for converting a current signal output by the closed-loop hall current sensor into a voltage signal; alternatively, the first and second electrodes may be,
the current detection unit circuit comprises an open-loop Hall current sensor.
Optionally, the voltage comparison unit circuit includes a first operational amplifier, a second operational amplifier, a power supply and a voltage divider circuit, and a forward input end of the first operational amplifier and a reverse input end of the second operational amplifier are respectively connected to an output end of the current detection unit circuit;
the power supply is connected with a power pin of the second operational amplifier, and the output end of the power supply is provided with the voltage division circuit;
the voltage division circuit comprises a first resistor, a second resistor and a third resistor which are sequentially connected in series, a first reference voltage is formed between the first resistor and the second resistor, a second reference voltage is formed between the second resistor and the third resistor, the first reference voltage is connected to the reverse input end of the first operational amplifier, and the second reference voltage is connected to the forward input end of the second operational amplifier.
Optionally, the output ends of the first operational amplifier and the second operational amplifier are respectively connected with a non-return diode.
Optionally, the voltage comparing unit circuit further includes a first current limiting resistor, and the first current limiting resistor is connected to the input terminals of the first operational amplifier and the second operational amplifier.
Optionally, the switch driving circuit further comprises a processor, the processor is connected to the output end of the voltage comparison unit circuit, and the output end of the processor is connected to the switch driving unit circuit.
Optionally, a second current limiting resistor is provided at the input end of the processor.
The converter is characterized by comprising an overcurrent protection circuit arranged in an electronic switch of the first aspect in a circuit loop, wherein the output end of the electronic switch is connected with the input end of a current detection unit circuit, and the output end of a switch driving unit circuit is connected with the electronic switch.
Optionally, a first filter circuit and a second filter circuit which are sequentially arranged are further connected in series at the output end of the over-current protection circuit;
the first filter circuit is an LC filter circuit, and the second filter circuit is an EMI active filter.
In a third aspect, a further embodiment of the present invention provides a power supply network, including a battery, a power grid and the converter of any one of the second aspect, wherein an output end of the battery is connected to an electronic switch of the converter, and an output end of a current detection unit circuit of the converter is connected to an input end of the power grid; alternatively, the first and second electrodes may be,
the power supply comprises a battery, a power grid and the converter of any one of the second aspect, wherein the output end of the power grid is connected with a current detection unit circuit of the converter, and an electronic switch of the converter is connected with the input end of the battery.
The embodiment of the utility model provides an overcurrent protection circuit, converter and power supply network, include: when the current detection unit circuit, the voltage comparison unit circuit and the switch driving unit circuit are used, the overcurrent protection circuit is connected to a loop with a silicon carbide MOSFET, the current detection unit circuit is used for detecting the current in the loop and converting the current into a voltage signal to be sent to the voltage comparison unit circuit, the voltage comparison unit circuit receives the voltage signal and compares the voltage signal to send a driving control signal to the switch driving unit circuit, and the driving control circuit controls the on-off of the loop in time according to the driving control signal, so that the silicon carbide MOSFET in the loop is effectively protected. Because the overcurrent protection circuit can effectively protect the silicon carbide MOSFET, the stable and reliable operation of the converter and the power supply network can be further ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit block diagram of an embodiment of the over-current protection circuit of the present invention;
fig. 2 is a circuit schematic diagram of an embodiment of the over-current protection circuit of the present invention;
fig. 3 is a schematic circuit diagram of another embodiment of the over-current protection circuit of the present invention;
FIG. 4 is a diagram of an integrated circuit according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a circuit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of an embodiment of the power supply network of the present invention;
in the figure, H1, H2 and H3 are hall current sensors; U1A-U3A are first operational amplifiers; U1B-U3B are second operational amplifiers; D1-D6 are diodes; a1 is a processor, R1-R13 are resistors;
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be apparent that numerous technical details are set forth in the following detailed description to provide a more thorough description of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without some of these details. In addition, some methods, means, components and applications thereof known to those skilled in the art are not described in detail in order to highlight the gist of the present invention, but the implementation of the present invention is not affected thereby. The embodiments described herein are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides an overcurrent protection circuit is applicable to and has electronic switch, for example, in the return circuit of carborundum MOSFET, can effectively protect electronic switch; the method can be particularly applied to the converter and a power supply network with the converter so as to ensure the stable and reliable operation of the converter and the power supply network.
Referring to fig. 1 to 3, an embodiment of the present invention provides an overcurrent protection circuit, which includes a current detection unit circuit, a voltage comparison unit circuit, and a switch driving unit circuit, wherein an output terminal of the current detection unit circuit is connected to the voltage comparison unit circuit, and an output terminal of the voltage comparison unit circuit is connected to the switch driving unit circuit;
the current detection unit circuit is connected in series in the circuit loop and used for detecting the current in the loop, converting a current signal into a voltage signal and sending the voltage signal to the voltage comparison unit circuit;
the voltage comparison unit circuit is used for receiving the voltage signal, comparing the voltage signal and sending a driving control signal to the switch driving unit circuit; and the switch driving unit circuit is an electronic switch which is used for receiving the driving control signal and controlling the on-off of the loop according to the driving control signal.
The circuit voltage comparison unit circuit converts an output level signal from a low level to a high level and sends the output level signal to the switch driving unit circuit when an input voltage signal is greater than the threshold voltage of the voltage comparison unit circuit; the switch driving unit circuit blocks the output of the driving signal according to the high level signal (generally 3.3V), and directly cuts off an electronic switch for switching on and off a loop, so that the switch of the loop and other equipment can be reliably and rapidly protected.
In this embodiment, different voltage protection thresholds can be specifically set according to different types of silicon carbide MOSFETs, so that the overcurrent protection of the current transformer with different power levels can be adapted.
For convenience of description, the embodiments of the present invention will be described below with silicon carbide MOSFETs instead of the generic concept (electronic switches), but this is not to be understood as the only protection object to which the present solution can be applied; in addition, the overcurrent protection circuits shown in fig. 2 and 3 are specific schematic circuit diagrams applied to a three-phase voltage-type converter, and therefore, a current detection unit circuit and a voltage comparison unit circuit are drawn corresponding to each phase in the drawings, and the current detection unit circuit and the voltage comparison unit circuit in each phase have the same structure, wherein, in order to distinguish the current detection unit circuit and the voltage comparison unit circuit in each phase circuit, in the drawings, main components in the current detection unit circuit and the voltage comparison unit circuit are respectively distinguished by arabic numerals. For the sake of clarity and brevity, only the circuit composition on one of the phases is selected for detailed description.
Referring to fig. 2, as an alternative embodiment, the current detection unit circuit includes a closed-loop hall current sensor H1 and a resistor R7, an output terminal of the closed-loop hall current sensor H1 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, and the resistor R7 is used for converting a current signal output by the closed-loop hall current sensor into a voltage signal.
The input end and the output end of the closed-loop Hall current sensor are current signals; because the input of the closed-loop Hall current sensor is a current signal, and the output of the closed-loop Hall current sensor is also a current signal, the output current signal can be converted into a voltage signal by arranging a resistor at the output end of the closed-loop Hall current sensor for facilitating subsequent voltage comparison.
In another alternative, shown in fig. 3, the current sensing unit circuit comprises an open loop hall current sensor H1.
The open-loop Hall current sensor has high accuracy and linearity of the measurement result. The input is a current signal and the output is a voltage signal. Because the over-current protection circuit can output voltage signals, an electronic element for converting current into voltage does not need to be additionally arranged, and the over-current protection circuit has a simple topological structure.
In other alternatives, the current detection unit circuit may also use an optical coupling isolation amplifier of AVAGO, a capacitance isolation amplifier of TI, or a sigma delta isolation amplifier of ADI, or other electronic components that can implement a current detection function.
Referring to fig. 2 and 3, in some alternative embodiments, the voltage comparing unit circuit includes a first operational amplifier U1B, a second operational amplifier U1A, a power supply VCC, and a voltage dividing circuit, and a forward input terminal 5 of the first operational amplifier and a reverse input terminal 2 of the second operational amplifier are respectively connected with an output terminal of the current detecting unit circuit; the power supply is connected with a power supply pin 8 of the second operational amplifier, and the output end of the power supply is provided with the voltage division circuit.
The voltage division circuit comprises a first resistor R1, a second resistor R2 and a third resistor R3 which are sequentially connected in series, a first reference voltage VH is formed between the first resistor and the second resistor, a second reference voltage VL is formed between the second resistor and the third resistor, the first reference voltage VH is connected to the reverse input end 6 of the first operational amplifier, and the second reference voltage is connected to the forward input end 3 of the second operational amplifier.
For the sake of clarity, the embodiment of the present invention provides a principle of an overcurrent protection circuit, which is now combined with a specific application in a converter, a protection silicon carbide MOSFET is described as an example:
referring to fig. 4, to protect the silicon carbide MOSFET, the over-current protection circuit is connected in a loop of the silicon carbide MOSFET, and the current in the loop passes through hall current sensors H1-H3; referring to fig. 2 again, when the hall current sensors H1-H3 are closed-loop hall current sensors, the magnitude of the current becomes 1/2000 of the actual current through the hall current sensors H1-H3, and the current becomes an alternating current signal with 1.65V as a reference. The current signal passes through the resistors R7-R9, and then a voltage is generated across the resistors, i.e., the current signal becomes the voltage signals IA, IB, IC. Voltage signals IA, IB and IC are respectively output from the output terminals of the hall current sensors H1-H3 (note that, here, the voltage signals are still represented by the current symbol I, and are not written by mistake, because the current is converted into the voltage signals);
or, when the hall current sensors H1-H3 are closed-loop hall current sensors, the three-phase current passes through H1-H3, the magnitude of the current becomes 1/2000 of the actual current, and the current becomes alternating voltage signals IA, IB, IC with 1.65V as a reference;
the voltage signals IA, IB, and IC output from the current detection unit circuit pass through the operational amplifiers U1A and U1B, U2A and U2B, and U3A and U3B of the respective phases, and the highest levels of the voltage signals IA, IB, and IC are compared with the first reference voltage VH, the lowest levels of the voltage signals IA, IB, and IC, and the second reference voltage VL. When the highest level of the voltage signals IA, IB and IC is greater than VH or the lowest level thereof is less than VL, the signal FAULT sent by the operational amplifiers U1A-U3A and U1B-U3B changes from low level to high level and sends the high level signal to the driving chip of the silicon carbide MOSFET (i.e. the switch driving unit circuit in the embodiment), and after receiving the high level signal, the driving chip immediately blocks driving to stop wave generation and the silicon carbide MOSFET is cut off (also called off), so that the purpose of overcurrent protection is achieved, and overcurrent protection of the silicon carbide MOSFET and other devices in the loop is realized.
With continued reference to fig. 2 and 3, a non-return diode is connected to the output terminals of the first and second operational amplifiers, respectively, so that the output signal of each operational amplifier is transmitted to the resistor R10 and is not transmitted from one operational amplifier to the other operational amplifier. The non-return diode is a schottky diode.
In some embodiments, the voltage comparison unit circuit further comprises a first current limiting resistor R4, which is used for reducing the current flowing into the input end of the operational amplifier and protecting the operational amplifier from overcurrent damage. Since the signal input terminal of the operational amplifier is connected to the input terminals of the first operational amplifier and the second operational amplifier, the first current limiting resistor R4 protects the first operational amplifier and the second operational amplifier at the same time.
In some over-current protection schemes, over-current protection is carried out by software. For example, when the current is too large, the current detection unit circuit converts the current signal into a low-voltage signal (generally 04.3V) which can be recognized by the processor and sends the low-voltage signal to the processor; the processor sets an overcurrent threshold value based on software programming, and when the received actual current is larger than the set overcurrent threshold value, the processor determines that the processor is in an overcurrent state, then enters an overcurrent protection interruption program, stops sending a driving signal to disconnect the silicon carbide MOSFET and cut off the current of a loop, thereby playing a role in protecting the silicon carbide MOSFET.
However, only by means of software overcurrent protection, since the current signal needs to be calculated by the processor and then compared with the threshold value to generate the overcurrent protection signal, once the protection mode has a transient fault, even if the protection time is short, the silicon carbide MOSFET can be damaged due to untimely protection.
Therefore, a problem of protection reliability exists when a certain overcurrent protection mode is singly adopted, and in order to solve the problem, as shown in fig. 2 to 4, as an alternative embodiment, the overcurrent protection circuit provided in this embodiment further includes a processor, the processor is connected to the output end of the voltage comparison unit circuit, and the output end of the processor is connected to the switch driving unit circuit. Thus, the signal output by the voltage comparison unit circuit is divided into two paths, one path is transmitted to the processor, the processor stops sending a driving signal to the driving unit circuit, and the silicon carbide MOSFET is switched off to cut off the current of the loop; the other path of the signal is directly sent to a switch driving unit circuit, the output of a driving signal is blocked, and the silicon carbide MOSFET is disconnected; thus realizing double protection of the silicon carbide MOSFET and other devices in the loop.
In conjunction with the above example, one path of the FAULT signal is sent to the driver chip of the sic MOSFET, and the other path is sent to the processor a1, where the FAULT signal is a FAULT signal, that is, an overcurrent protection signal sent by the operational amplifier. PWM (Pulse Width Modulation) driving signals PWMA, PWMB, and PWMC of the processor a1 are signals for driving the silicon carbide MOSFET to be turned on, and when the FAULT signal becomes a high level, the processor a1 stops the wave generation and turns off the silicon carbide MOSFET, so as to achieve the purpose of overcurrent protection.
In some embodiments, a second current limiting resistor R10 is provided at the input of the processor. The method is used for preventing the processor from being damaged due to the fact that the input current is too large.
The embodiment of the utility model provides an overcurrent protection circuit, include: when the current detection unit circuit, the voltage comparison unit circuit and the switch driving unit circuit are used, the overcurrent protection circuit is connected to a loop with a silicon carbide MOSFET, the current detection unit circuit is used for detecting the current in the loop and converting the current into a voltage signal to be sent to the voltage comparison unit circuit, the voltage comparison unit circuit receives the voltage signal and compares the voltage signal to send a driving control signal to the switch driving unit circuit, and the driving control circuit controls the on-off of the loop in time according to the driving control signal, so that the silicon carbide MOSFET in the loop is effectively protected. Because the overcurrent protection circuit can effectively protect the silicon carbide MOSFET, the stable and reliable operation of the converter and the power supply network can be further ensured.
Example two
Referring to fig. 5, an embodiment of the present invention further provides a converter, including an electronic switch disposed in a circuit loop and the overcurrent protection circuit of any of the foregoing embodiments, wherein an output end of the electronic switch is connected to an input end of the current detection unit circuit, and an output end of the switch driving unit circuit is connected to the electronic switch.
The electronic switch is a silicon carbide MOSFET.
The embodiment of the utility model provides a converter is owing to included the aforesaid overcurrent protection circuit of being connected with the electronic switch in the return circuit, can effectively protect electronic switch in the return circuit, and specific can realize the effective protection to carborundum MOSFET to can guarantee the reliable and stable operation of converter to a certain extent.
Referring to fig. 4, a first filter circuit LC and a second filter circuit EMI, which are sequentially arranged, are also connected in series at the output end of the over-current protection circuit;
the first filter circuit is an LC filter circuit, and the second filter circuit is an EMI active filter.
When the converter is used in a power supply network, the first filter circuit plays a role in rectification, and the second filter circuit plays a role in restraining interference from a power grid from invading the power supply.
EXAMPLE III
Referring to fig. 6, another embodiment of the present invention provides a power supply network, including a battery, a power grid and a converter of the second embodiment, wherein the output terminal of the battery is connected to the electronic switch of the converter, and the output terminal of the current detection unit circuit of the converter is connected to the input terminal of the power grid.
Alternatively, the first and second electrodes may be,
the power supply network comprises a battery, a power grid and the converter of the second embodiment, wherein the output end of the power grid is connected with the current detection unit circuit of the converter, and the electronic switch of the converter is connected with the input end of the battery.
The embodiment of the utility model provides a power supply network, owing to include the converter that has overcurrent protection circuit can guarantee power supply network's reliable and stable operation to a certain extent.
It should be noted that the terms "upper", "lower", and the like, herein indicate orientations and positional relationships, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element. As will be appreciated by one of ordinary skill in the art, the situation may be specified.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An overcurrent protection circuit, comprising: the output end of the current detection unit circuit is connected with the voltage comparison unit circuit, and the output end of the voltage comparison unit circuit is connected with the switch driving unit circuit;
the current detection unit circuit is connected in series in the circuit loop and used for detecting the current in the loop, converting a current signal into a voltage signal and sending the voltage signal to the voltage comparison unit circuit;
the voltage comparison unit circuit is used for receiving the voltage signal, comparing the voltage signal and sending a driving control signal to the switch driving unit circuit;
and the switch driving unit circuit is an electronic switch which is used for receiving the driving control signal and controlling the on-off of the loop according to the driving control signal.
2. The overcurrent protection circuit of claim 1, wherein the current detection unit circuit comprises a closed-loop hall current sensor and a resistor, an output end of the closed-loop hall current sensor is connected with one end of the resistor, the other end of the resistor is grounded, and the resistor is used for converting a current signal output by the closed-loop hall current sensor into a voltage signal; alternatively, the first and second electrodes may be,
the current detection unit circuit comprises an open-loop Hall current sensor.
3. The overcurrent protection circuit of claim 1, wherein the voltage comparison unit circuit comprises a first operational amplifier, a second operational amplifier, a power supply and a voltage divider circuit, and a forward input terminal of the first operational amplifier and a reverse input terminal of the second operational amplifier are respectively connected with an output terminal of the current detection unit circuit;
the power supply is connected with a power pin of the second operational amplifier, and the output end of the power supply is provided with the voltage division circuit;
the voltage division circuit comprises a first resistor, a second resistor and a third resistor which are sequentially connected in series, a first reference voltage is formed between the first resistor and the second resistor, a second reference voltage is formed between the second resistor and the third resistor, the first reference voltage is connected to the reverse input end of the first operational amplifier, and the second reference voltage is connected to the forward input end of the second operational amplifier.
4. The overcurrent protection circuit of claim 3, wherein the output terminals of the first operational amplifier and the second operational amplifier are respectively connected with a non-return diode.
5. The overcurrent protection circuit of claim 3, wherein the voltage comparison unit circuit further comprises a first current limiting resistor connected to the input terminals of the first operational amplifier and the second operational amplifier.
6. The overcurrent protection circuit of claim 1, further comprising a processor, the processor being connected to the output of the voltage comparison unit circuit, the output of the processor being connected to the switch drive unit circuit.
7. The overcurrent protection circuit of claim 6, wherein a second current limiting resistor is provided at the input of the processor.
8. A converter, comprising an electronic switch disposed in a circuit loop and the overcurrent protection circuit of any one of claims 1 to 7, wherein an output terminal of the electronic switch is connected to an input terminal of the current detection unit circuit, and an output terminal of the switch driving unit circuit is connected to the electronic switch.
9. The converter according to claim 8, wherein a first filter circuit and a second filter circuit are sequentially connected in series at the output end of the over-current protection circuit;
the first filter circuit is an LC filter circuit, and the second filter circuit is an EMI active filter.
10. An electric power supply network, characterized in that, comprising a battery, a power grid and the converter of claim 8, the output terminal of the battery is connected with the electronic switch of the converter, the output terminal of the current detection unit circuit of the converter is connected with the input terminal of the power grid; alternatively, the first and second electrodes may be,
the converter comprises a battery, a power grid and the converter of claim 8, wherein the output end of the power grid is connected with a current detection unit circuit of the converter, and an electronic switch of the converter is connected with the input end of the battery.
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| CN201922359839.5U CN211428908U (en) | 2019-12-24 | 2019-12-24 | Overcurrent protection circuit, converter and power supply network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115955224A (en) * | 2023-03-10 | 2023-04-11 | 苏州纳芯微电子股份有限公司 | Overcurrent protection device and electronic equipment |
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| CN115955224A (en) * | 2023-03-10 | 2023-04-11 | 苏州纳芯微电子股份有限公司 | Overcurrent protection device and electronic equipment |
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