CN210629075U - Electronic fuse - Google Patents
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- CN210629075U CN210629075U CN201921294819.8U CN201921294819U CN210629075U CN 210629075 U CN210629075 U CN 210629075U CN 201921294819 U CN201921294819 U CN 201921294819U CN 210629075 U CN210629075 U CN 210629075U
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- 238000002955 isolation Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000005669 field effect Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 9
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- 230000003287 optical effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007488 abnormal function Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
The utility model provides an electronic fuse; the isolation unit is used for isolating signals between the first power domain and the second power domain; the first connection end VIN, the passage unit, the second connection end VOUT and the current detection unit are sequentially connected in series; the path unit is in a conducting or disconnecting state and is used for controlling the conducting state from the first connection end VIN to the second connection end VOUT. The utility model has the advantages that: the electronic fuse can be normally conducted to work when the power supply is not supplied; the application range of the fuse is expanded, and the I2t characteristic formed by the fuse in an overcurrent state is realized; the state of the fuse is accurately monitored, and the protection capability is strong.
Description
Technical Field
The utility model relates to an electronic circuit field, concretely relates to electronic fuse.
Background
Fuses are electrical devices used in electrical systems to protect against excessive currents. If a load coupled to the power electronics supply draws too much current from the power supply, the fuse disconnects the load from the power electronics supply to prevent damage within the electrical system caused by this too much current. Fuses typically include conductors whose physical dimensions are selected to limit current to a threshold value. In the event that the current exceeds this threshold, the conductor melts to prevent excessive current from damaging the electrical system.
The existing fuse utilizes a heating fusing principle, a fuse link part is the core of the fuse, the fuse link plays a role in cutting off current when fused, the fuse processing technology requirement of the fuse is high, the response speed of the existing fuse is low, and the fusing current is difficult to control to an accurate value. The existing fuse can be scrapped after being melted and cannot be used for the second time.
Fuses are gradually replaced by circuit breakers. A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by an overcurrent or an overload or a short circuit. In many applications, circuit breakers may be implemented using electronic switches (e.g., MOS transistors, IGBTs, etc.) to disconnect the protected circuit from the power supply in the event of an overcurrent. Such an electronic circuit breaker may also be referred to as an electronic fuse (e-fuse, smart fuse, electronic fuse, etc.).
However, the existing electronic fuse has the following defects:
the electronic fuse is in a normally-off state and can normally work only after the power supply (power-on) of the power supply is controlled;
the I2t characteristic of the fuse being formed under overcurrent conditions is not realized;
the state of the fuse is monitored simply and inaccurately, which results in insufficient protection;
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the utility model provides an electronic fuse and working method thereof.
According to a first aspect of the present invention, the present invention provides an electronic fuse; the method comprises the following steps:
the power supply device comprises a first power domain, a second power domain, a first connecting end VIN, a second connecting end VOUT, an isolation unit, a control and protection unit, a passage unit and a current detection unit; the first power domain refers to a working power domain of a transmission and isolation unit of an external signal; the second power domain is a working power domain of the isolation unit and the control and protection unit; the isolation unit is used for isolating signals between the first power domain and the second power domain; and the signal is decoded and decoded; the signals are external signals and internal signals;
the first connection end VIN, the passage unit, the second connection end VOUT and the current detection unit are sequentially connected in series; the access unit is in a conducting or disconnecting state and is used for controlling the conducting state from the first connecting end VIN to the second connecting end VOUT;
the current detection unit is used for detecting the current flowing through the passage unit; the control and protection unit is used for controlling the state of the access unit; and when the control and protection unit does not control the access unit, the access unit is in a conducting state.
According to a preferred embodiment of the present invention, the path unit includes a driving unit and a power switching tube; the driving unit is used for driving the power switch tube; the conducting state of the power switch tube determines the conducting or the cutting-off state of the access unit.
According to a preferred embodiment of the present invention, the first port of the driving unit is connected to the control and protection unit, the second port of the driving unit is connected to the driven end of the power switch tube, and the third port of the driving unit is connected to the output end of the power switch tube and the current detection unit; the input end of the power switch tube is connected with the first connection end VIN.
According to a preferred embodiment of the present invention, the power switch tube is composed of a plurality of sub power switch tubes in parallel.
According to a preferred embodiment of the present invention, the power switch tube is an electrically controlled switch device.
According to a preferred embodiment of the present invention, the power switch is a junction field effect transistor or a metal oxide semiconductor field effect transistor.
According to a preferred embodiment of the present invention, the electrically controlled switching device is: crystal valve tube, silicon controlled rectifier, relay or contactor.
According to a preferred embodiment of the present invention, the jfet is an N-channel jfet or a P-channel jfet.
According to a preferred embodiment of the present invention, the mosfet is an N-channel jfet or a P-channel jfet.
According to a preferred embodiment of the present invention, the mosfet is an enhancement mode mosfet or a depletion mode mosfet.
According to a preferred embodiment of the present invention, when the mosfet is a P-channel jfet, the mosfet is a PMOS transistor; the driven end of the power switch tube is the grid electrode of the power PMOS tube; the input end of the power switch tube is the drain electrode of the power PMOS tube; the output end of the power switch tube is the source electrode of the power PMOS tube;
according to a preferred embodiment of the present invention, the driving unit is a switch controlled by the control and protection unit; two ends of the switch are respectively a second port and a third port of the driving unit.
According to a preferred embodiment of the present invention, the current detection unit implements the functional curve of I2t, triggering protection with the curve of I2 t.
According to a preferred embodiment of the present invention, the current detecting unit is a resistor.
According to a preferred embodiment of the present invention, the current detecting unit is a current transformer.
According to a preferred embodiment of the present invention, the current transformer is one of a hall device, a TMR, a fluxgate, a rogowski coil.
According to a preferred embodiment of the present invention, the isolation unit is optically coupled.
According to a preferred embodiment of the present invention, the isolation unit is a transformer isolation.
According to the utility model discloses a second aspect, the utility model provides an electronic fuse's working method specifically is:
the electronic fuse is in a pass-through state when not powered;
after the electronic fuse is powered, the electronic fuse is in a connection or disconnection state.
According to a preferred embodiment of the method according to the invention, after the electrical fuse has been supplied with power, the current through the electrical fuse is detected and, if said current exceeds a set value, said electrical fuse is set to an open state.
According to a preferred embodiment of the method of the present invention, after the electronic fuse is powered, the external signal controls the on state of the electronic fuse.
According to a preferred embodiment of the method of the present invention, after the electronic fuse is powered, the external signal is combined with an internal detection to determine whether the current flowing through the electronic fuse exceeds a set value, and the electronic fuse is controlled to be set to an on or off state.
According to a preferred embodiment of the method of the present invention, the detecting the current flowing through the electronic fuse is performed by fitting a functional curve of I2t, and the electronic fuse is set to an off state by triggering protection with a curve of I2 t.
According to a preferred embodiment of the method of the present invention, the function curve of I2t is detected as setting different overcurrent times and overcurrent times.
The utility model has the advantages of it is following:
the electronic fuse can be normally conducted to work when in a non-power supply (power-on) state, so that the application range of the fuse is expanded;
meanwhile, the I2t characteristic of the fuse formed in an overcurrent state is realized;
the state of the fuse is accurately monitored, and the protection capability is strong.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a general block diagram of an electronic fuse according to the present invention.
Figure 2 the present invention is an embodiment of a pathway unit.
Fig. 3 illustrates an external signal embodiment of the present invention.
Figure 4 is an embodiment of an isolation unit of the present invention.
Fig. 5 shows a second embodiment of the isolation unit of the present invention.
The reference numbers in the figures illustrate:
1-a first power domain, 2-a second power domain, 11-an isolation unit, 12-a control and protection unit, 13-a path unit, 14-a current detection unit, 111-an input coil, 112-an output coil, 113-a light emitter, 114-a light receiver, 137-a driving unit and 138-a power switch tube;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The present invention will be described in more detail and fully with reference to the following examples and accompanying drawings.
Introduction of basic knowledge:
for fuses, the value of the heat of fusion (I2T), which is a parameter of the fuse. The corresponding current I squared times the fusing time T, in a short adiabatic approximation. The fuse link is melted, and the nominal energy value required by the partially vaporized cutting current is the minimum thermal energy value required by the fuse to be fused. It is a constant for each different fuse, determined by the material and specification of the fuse itself. I2t facilitates the selection of fuses.
"fusing Integral (Melting Integral): the blowing integral of a fuse is the energy required to blow the fuse element of this fuse, also referred to as the blow value I2 t. The structure, material and cross-sectional area of the fuse element determine this value. Each series of fuses uses different materials and component configurations depending on the rated current values, and therefore it is necessary to determine the I2t for each fuse. Normally, in a direct current circuit, 10 times of rated current is used as fault current, so that a fuse is opened in an extremely short time, and a very accurate I2 t' is measured by a high-speed oscillograph and an integration program.
The utility model discloses electronic fuse has combined the power switch tube of high withstand voltage, low impedance and the function that the electric current was listened to can real-time control electronic fuse's state. Its design operates with minimal heat sinks. The utility model discloses well power switch tube impedance is very little promptly, even the heavy current, it is also very little to generate heat, and the radiator that needs is little.
As shown in fig. 1, the electronic fuse of the present invention includes a first power domain 1, a second power domain 2, a first connection end VIN, a second connection end VOUT, an isolation unit 11, a control and protection unit 12, a path unit 13, and a current detection unit 14.
The power domain here means that all or part of the relevant modules in the fuse operate at a certain supply voltage. It should be noted that the power supply voltage herein includes not only the power supply but also the power ground; the power supply ground is not necessarily 0V voltage; it may also be a positive or negative voltage; but only low with respect to the voltage value of the power supply. For example, in a normal circuit, there are a power supply of an analog circuit and a ground of the analog circuit; a power supply for the digital circuit and a ground for the digital circuit.
In the utility model, the power supply and the power supply ground of the first power domain 1 are respectively a first voltage and a first ground; the power supply and the power ground of the second power domain 2 are respectively a second voltage and a second connection terminal VOUT;
the transmission and isolation unit 11 of the external signal operates in the first power domain 1; the isolation unit 11 and the control and protection unit 12 work in the second power domain 2; the isolation unit 11 is used for isolating signals between the first power domain 1 and the second power domain 2; in fact, the isolation unit 11 is to isolate signals between different power domains, so as to avoid signal transmission errors caused by different operating power supply voltages of signals between different power domains, and even avoid abnormal functions of circuits in different power domains.
The isolation unit 11 performs isolation transmission of signals between different power domains by performing decoding (or modulation and demodulation) processing on the signals of different power domains. And the signals mentioned herein can be divided into external signals and internal signals; namely, the external signal is the signal under the first power domain 1; the internal signal is a signal in the second power domain 2.
The external signal is a signal for controlling the electronic fuse and the outside interactively. The internal signal operates inside the electronic fuse and is a signal operating in the second power domain 2 that is isolated from the external signal by the isolation unit 11.
The first connection terminal VIN, the pass unit 13, the second connection terminal VOUT, and the current detection unit 14 are sequentially connected in series. In different states, the pass unit 13 is in an on or off state. It should be noted that the first connection terminal VIN, the pass unit 13, the second connection terminal VOUT and the current detection unit 14, which are connected in series, are similar to a conventional fuse function.
When the path unit 13 is in a conducting state, a path is formed from the first connection terminal VIN to the second connection terminal VOUT, and the path unit is in a conducting (or called as a path) state;
when the pass unit 13 is in the off state, the first connection terminal VIN forms an open circuit (or referred to as an open circuit) to the second connection terminal VOUT, and is in the off state.
When the pass unit 13 is in the on state, the first connection terminal VIN forms a pass to the second connection terminal VOUT, and the current flows through the pass. The current detection unit 14 is used for detecting the magnitude of the current flowing through the path unit.
Depending on the magnitude of the current flowing through the circuit, the current detection unit 14 will signal the control and protection unit 12, and at the same time, the current detection unit 14 implements the functional curve of I2t, and triggers protection with the curve of I2 t. The further current detecting unit 14 implements the functional curve of I2t by fitting, and may also implement the functional curve of I2t by other means. The protection mode is safer and more accurate than that of the traditional fuse, and different overcurrent multiples and overcurrent time can be set according to different products.
The current detecting unit 14 may be implemented by a resistor, and may also be a current transformer, such as a hall, TMR, fluxgate, rogowski coil, or other current transformer.
When the first power domain 1 and the second power domain 2 are not powered on (i.e., powered), the pass unit 13 is in a conducting state; after the first power domain 1 and the second power domain 2 are powered on, whether the access unit 13 is in the on state or the off state is determined by the control and protection unit.
After the first power domain 1 and the second power domain 2 are normally powered on, if the current flowing through the path unit 13 exceeds a predetermined value, the current detection unit 14 sends a signal to the control and protection unit 12; the state control path unit 13, which controls the external signal combined with the protection unit 12 at the same time, becomes the off state.
On the contrary, if the first power domain 1 and the second power domain 2 are not normally powered on, the control and protection unit 12 does not control in which state the path unit 13 is in even if the current flowing through the path unit 13 exceeds a predetermined value.
When the external signal gives a command to turn off, it becomes an internal signal after being processed by the isolation unit 11. The internal signal controls the access unit 13 to be in a disconnected state through the control and protection unit 12; on the contrary, when the external signal gives a command to turn on, the pass unit 13 is in a turned-on state.
The path unit 13 comprises a driving unit 137 and a power switch tube 138; the driving unit is used for driving the power switch tube; the on state of the power switch tube determines the on or off state of the pass unit.
The drive unit 137 has 3 ports; the first port is connected with the control and protection unit through 131, the second port is connected with a driven end (for convenience of explanation, shown by a power MOS tube in the figure, namely, connected with a grid electrode of the MOS) of the power switch tube 138 through 132, and the third port is connected with an output end (namely, a source electrode of the power MOS tube in the figure) of the power switch tube 138 and the current detection unit through 133; the input terminal of the power switch tube 138 (i.e. the drain of the power MOS tube in the figure) is connected to the first connection terminal VIN through 134. It should be noted that the power MOS is only a preferred schematic form of the power switch. 131-134 is the definition of different names for distinguishing different connecting lines. For convenience of illustration, the port names of the driving unit 137 and the power switch tube 138 are not shown in the drawings, and can be clearly derived from the drawings according to the different connection lines 131 and 134.
It should be noted in particular here that the pass unit 13, in particular the drive unit 137 therein, also needs to be connected to the second voltage of the second power domain 12 in some cases.
In order to keep the power switch tube impedance small. The power switch tube is formed by a plurality of power switch tubes in parallel. Thus, even if a large current is applied, heat generation is small.
The power switch tube 138 in a particular pass unit may be: junction field effect transistors (Junction FET-JFETs) and metal-oxide semiconductor field effect transistors (MOS-FETs, for short).
Meanwhile, the power switch tube 138 may also be an electric control switch device such as a thyristor, a relay, a contactor, and the like. The specific form of the power switch tube is selected according to actual needs.
The junction field effect transistor can also be an N-channel junction field effect transistor and a P-channel junction field effect transistor;
the metal oxide semiconductor field effect transistor can also be an N-channel junction field effect transistor and a P-channel junction field effect transistor; meanwhile, the field effect transistor can also be an enhanced insulated gate field effect transistor and a depletion insulated gate field effect transistor.
The power switch tube 138 may be switched on or off in different states in corresponding operating states.
For example: the main difference between the N-type JFET and the N-type power MOS transistor is that the threshold voltage is different, the threshold voltage of the JFET is a negative value, and the power NMOS transistor is a positive value, so that the JFET is conducted when the grid voltage is in short circuit with the source voltage. Namely the JFET can be conducted by needing 0V voltage; the JFET requires a negative voltage (e.g., -15V) to turn off.
The power NMOS transistor needs a positive voltage, so that the power MOS transistor can be turned off by needing 0V voltage; the power NMOS requires a positive voltage (e.g., 10V) to turn on.
The main function of the driving unit 137 is to turn on or off the power switch tube 138.
As shown in fig. 2, the power switch tube 138 is a PMOS power transistor according to an embodiment of the present invention. The operational functions of the driving unit 137 can be briefly described as: a switch controlled by the control and protection unit 12 through 131.
Two ends of the switch are respectively a second port of the driving unit 137 and a third port of the driving unit 137; namely, the second port of the driving unit 137 is connected to the gate of the power PMOS transistor (the driven end stage of the power PMOS transistor) through 132; that is, the third port of the driving unit 137 is connected to the drain of the power PMOS transistor (the output terminal of the power PMOS transistor) through the connection 133.
In general, if the first power domain 1 and the second power domain 2 are not normally powered on, the switch is closed, and the second port and the third port of the driving unit 137 are shorted, that is, the gate and the drain of the power PMOS transistor are shorted (in this case, the power PMOS transistor is in a diode connection mode). In this case, since the threshold voltage of the power PMOS transistor is less than or equal to 0V; therefore, the power PMOS tube is in a conducting state.
After the first power domain 1 and the second power domain 12 are normally powered on, if the current flowing through the path unit 13 exceeds a predetermined value, the current detection unit 14 sends a signal to the control and protection unit 12; the control and protection unit 12 controls the switch to be in an off state in combination with the state of the external signal, at this time, the gate and the drain of the power PMOS transistor are disconnected, and the power PMOS transistor is in an off state.
For the external signal, for convenience of description, in the drawings of the external signal embodiment, only the units related to the external signal are illustrated, and other parts not illustrated in the drawings are similar to those in the general block diagram of the electronic fuse of fig. 1.
As shown in fig. 3, an external signal (indicated by a control signal in the figure) is input to the isolation unit 11, where the control signal is used to control the state (on or off) of the pass unit 13.
It should be particularly noted that the control signal may be a level signal, for example, when the control signal is a first level signal (for example, a high level or a low level), the control signal is processed by the isolation unit 11 and then converted into an internal signal; the internal signal makes the access unit 13 in a conducting state through the control and protection unit 12; conversely, when the control signal is a second level signal (opposite to the previous second level signal, for example, low level or high level), the pass unit 13 is in the off state.
It should be noted that in some fields, such as power control, in some industrial fields, even aerospace level applications, the reliability requirement is high, and the insufficient level control signal may not stably control the state of the electronic fuse due to noise, jitter, interference, etc.
The (external) signal here will be set to a pulsed signal. The concrete during operation: when the control signal is a first pulse signal (for example, a high-level pulse or a low-level pulse lasting for a certain time, that is, a signal having a certain pulse width). After being processed by an isolation unit 11 units, the signals are converted into internal signals; the internal signal makes the access unit 13 in a conducting state through the control and protection unit 12; conversely, when the control signal is a second pulse signal (opposite to the previous second level signal, such as a low level pulse or a high level pulse), the pass unit 13 is in the off state.
To the utility model provides an isolation unit, can be multiple form. It should be noted that, in any form, the isolation unit needs to satisfy the transmission function of the external signal in different embodiments of the present invention.
FIG. 4 shows one embodiment of an isolation unit of the present invention; here in the form of transformer isolation. Including an input coil 111 and an output coil 112; the two ends of the input coil 111 are respectively connected with an input signal and an input signal-ground; the output coil 112 has two ends connected to the output signal and the output signal ground, respectively. It should be noted that the principle of transformer isolation is illustrated here, and in practice, a corresponding modulator and demodulator are also included, which are not illustrated in the figure. Meanwhile, as the principle is schematic, the diagram does not include the power supply voltage and ground condition related to the first power domain and the second power domain appearing in the general block diagram of the electronic fuse of the present invention.
FIG. 5 shows a second embodiment of the isolation unit of the present invention; here in the form of optical coupling isolation. Including a light emitter 113 and a light receiver 114; the two ends of the light emitter 113 are respectively connected with an input signal and an input signal-ground; the output signal and the output signal ground are connected to both ends of the photodetector 114. In addition, it should be noted that the principle of optical coupler isolation is only illustrated here, and in practice, the optical coupler isolation circuit further includes a corresponding optical coupler driving circuit and an optical coupler output circuit, which are not illustrated in the drawing. Meanwhile, as the principle is schematic, the diagram does not include the power supply voltage and ground condition related to the first power domain and the second power domain appearing in the general block diagram of the electronic fuse of the present invention.
For the isolation unit, the above illustrates only the input-to-output form of a single signal. In practice, the present invention may be applied to a signal from an external signal to an internal signal or from an internal signal to an external signal, and may also include the transmission of a plurality of signals. That is, according to the different embodiments of the external signal, they can have a plurality of different signal transmission, and can realize one-way transmission (from the external signal to the internal signal or from the internal signal to the external signal) and two-way transmission (from the external signal to the internal signal and from the internal signal to the external signal), but the input and output signals are different and the directions are different.
According to the structural feature of aforementioned fuse, the utility model also provides an electronic fuse's working method, promptly:
the electronic fuse is in a pass-through state when not powered;
after the electronic fuse is powered, the electronic fuse is in a connection or disconnection state.
Therefore, when the fuse is not powered, the circuit applying the fuse can work normally through a path formed by the conducting state of the fuse, and the application range and the application scene are enlarged.
Meanwhile, after the electronic fuse is powered on, the current flowing through the electronic fuse is detected through the corresponding detection module, and if the current exceeds a set value, the electronic fuse is controlled to be set to be in a disconnected state.
After the electronic fuse is powered, the on-off state of the electronic fuse can be controlled through an external signal. The external signal controls the electronic fuse to be set in a pass-through or a break-off state in conjunction with an internal detection of whether the current flowing through the electronic fuse exceeds a set value.
For the current detection module, the current flowing through the electronic fuse is detected by fitting a functional curve for realizing I2t, the protection is triggered by the curve of I2t, and the electronic fuse is set to be in an open state during protection. Meanwhile, in order to meet the requirements of different products, different overcurrent multiples and overcurrent time can be set when the functional curve of I2t is detected. So as to realize I2t curves with different specifications and meet different application environments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electronic fuse, characterized by: the electronic fuse includes:
the power supply device comprises a first power domain, a second power domain, a first connecting end VIN, a second connecting end VOUT, an isolation unit, a control and protection unit, a passage unit and a current detection unit;
the isolation unit is used for isolating signals between the first power domain and the second power domain; and the signal is decoded and decoded; the signals are external signals and internal signals;
the first connection end VIN, the passage unit, the second connection end VOUT and the current detection unit are sequentially connected in series; the access unit is in a conducting or disconnecting state and is used for controlling the conducting state from the first connecting end VIN to the second connecting end VOUT;
the current detection unit is used for detecting the current flowing through the passage unit;
the control and protection unit is used for controlling the state of the access unit;
the path unit comprises a driving unit and a power switch tube; the driving unit is used for driving the power switch tube; the on state of the power switch tube determines the on or off state of the access unit;
the power switch tube is an electric control switch device;
the electric control switch device is as follows: crystal valve tube, silicon controlled rectifier, relay or contactor.
2. The electronic fuse according to claim 1, wherein: and when the control and protection unit does not control the access unit, the access unit is in a conducting state.
3. The electronic fuse according to claim 1, wherein: the first port of the driving unit is connected with the control and protection unit; the second port of the driving unit is connected with the driven end of the power switch tube; the third port of the driving unit is connected with the output end of the power switch tube and the current detection unit; the input end of the power switch tube is connected with the first connection end VIN.
4. The electronic fuse according to claim 1, wherein: the power switch tube is formed by a plurality of sub power switch tubes in parallel.
5. The electronic fuse according to claim 1, wherein: the current detection unit realizes the functional curve of I2t, and the protection is triggered by the curve of I2 t.
6. The electronic fuse according to claim 5, wherein: the current detection unit is a resistor.
7. The electronic fuse according to claim 5, wherein: the current detection unit is a current transformer.
8. The electronic fuse according to claim 7, wherein: the current transformer is one of a Hall device, a TMR, a fluxgate or a Rogowski coil.
9. The electronic fuse according to claim 1, wherein: the isolation unit is optically coupled.
10. The electronic fuse according to claim 1, wherein: the isolation unit is isolated by a transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294819.8U CN210629075U (en) | 2019-08-09 | 2019-08-09 | Electronic fuse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294819.8U CN210629075U (en) | 2019-08-09 | 2019-08-09 | Electronic fuse |
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| CN210629075U true CN210629075U (en) | 2020-05-26 |
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| CN201921294819.8U Active CN210629075U (en) | 2019-08-09 | 2019-08-09 | Electronic fuse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416968A (en) * | 2019-08-09 | 2019-11-05 | 无锡启腾电子科技有限公司 | An electronic fuse and its working method |
| CN113707509A (en) * | 2021-08-20 | 2021-11-26 | 旭程电子(深圳)有限公司 | Fuse with voltage monitoring function |
-
2019
- 2019-08-09 CN CN201921294819.8U patent/CN210629075U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416968A (en) * | 2019-08-09 | 2019-11-05 | 无锡启腾电子科技有限公司 | An electronic fuse and its working method |
| CN113707509A (en) * | 2021-08-20 | 2021-11-26 | 旭程电子(深圳)有限公司 | Fuse with voltage monitoring function |
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