CN210608512U - Electronic fuse with power management function - Google Patents
Electronic fuse with power management function Download PDFInfo
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- CN210608512U CN210608512U CN201921295430.5U CN201921295430U CN210608512U CN 210608512 U CN210608512 U CN 210608512U CN 201921295430 U CN201921295430 U CN 201921295430U CN 210608512 U CN210608512 U CN 210608512U
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Abstract
The utility model provides an electronic fuse with a power management function; 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, a current detection unit and a power supply management unit; the power supply management unit provides working voltage for other units in the electronic fuse; the working voltage is the working voltage of the first power domain and the working voltage of the second power domain. 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 fuse realizes management control of different internal working power supplies by arranging the power supply management unit; the complexity of an external power supply is reduced, and the application is simple; meanwhile, the power consumption of the electronic fuse can be effectively reduced, and the reliability and the stability of work are improved.
Description
Technical Field
The utility model relates to an electronic circuit field, concretely relates to from electronic fuse of taking power management function.
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 existing fuse needs to be externally connected with a plurality of power supplies, and has a complex application structure and low reliability; and the cost of implementation is high.
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 problem, the utility model provides an electronic fuse and working method from electrified source management function.
According to a first aspect of the present invention, the present invention provides an electronic fuse with a power management function; 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, a current detection unit and a power supply management 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 power supply management unit provides working voltage for other units in the electronic fuse;
the working voltage is the working voltage of a first power domain and the working voltage of a second power domain;
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 power management unit is an isolated power supply.
According to a preferred embodiment of the present invention, the isolation power supply is in a flyback or forward form.
According to a preferred embodiment of the present invention, the isolated power supply is in a half-bridge or full-bridge form.
According to a preferred embodiment of the present invention, the isolation power supply is any one of a boost, buck, or a combination of boost and buck.
According to a preferred embodiment of the present invention, the isolation power supply is in the form of a forward or flyback multiple output.
According to a preferred embodiment of the present invention, the isolated power source comprises a primary coil L1m and two secondary coils L11 and L12; the main coil is connected in series with a switch; the main coil L1m is connected with an input voltage; the two secondary windings L11 and L12 are connected to voltage output 1 and voltage output 2, respectively.
According to a preferred embodiment of the present invention, the winding directions of the primary and secondary coils of the isolated power supply are the same or opposite.
According to the utility model discloses a preferred embodiment, keep apart power input voltage and be external power supply, voltage output 1 and voltage output 2 connect first voltage and second voltage respectively after through subsequent processing.
According to a preferred embodiment of the present invention, the isolated power supply input voltage is connected to a first voltage; one of the outputs is connected to a second voltage after subsequent processing.
According to a preferred embodiment of the present invention, the isolated power supply input voltage is connected to a second voltage; one of the outputs is connected to a first voltage after subsequent processing.
According to a preferred embodiment of the present invention, the power management unit 15 is an integrated circuit chip.
According to a preferred embodiment of the present invention, the electric integrated circuit chip is either of Adum5000 or SN 6505.
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.
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;
the fuse realizes the management control of different internal working power supplies by arranging the power supply management unit; the complexity of an external power supply is reduced, and the application is simple; meanwhile, the isolated power supply has strong anti-interference capability, is convenient to realize multi-path output, has high safety and is easy to realize wide-range voltage input; the damage to the load after the power supply is abnormal is small. Can well ensure the normal and reliable work of the electronic fuse
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 with a power management function.
Figure 2 the present invention is an embodiment of a pathway unit.
Fig. 3 illustrates an external signal embodiment of the present invention.
Fig. 4 shows one embodiment of a power management unit of the present invention.
Fig. 5 shows a second embodiment of the power management 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, 15-a power management unit, 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 from electronic fuse of taking power management function has combined the power switch pipe 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 present invention provides an electronic fuse with power management function, which comprises 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, a current detection unit 14, and a power management unit 15.
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 first voltage and the second voltage are respectively provided by the power management unit 15.
The power management unit 15 functions to provide different operating voltages for other modules within the electronic fuse. It receives an external power supply (the external power supply signal lines are not illustrated here) and then processes the external power supply into a different voltage or current form for use by the internal module. In particular a first voltage and a second voltage.
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 the signal under 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 units related to the external signal are illustrated, and other portions not illustrated in the drawings are similar to those in the general block diagram of the electronic fuse with the power management function 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 the embodiments of the present invention in which the external signal is different.
For the power management unit 15, because the voltages are to be supplied to different voltage domains; so takes the form of an isolated power supply. The isolation power supply has the function of ensuring electrical isolation between different voltage domains, the isolation function is to protect the safety of the system, and when interference or pulse exists at one end of the isolation power supply, other parts cannot be affected due to mutual isolation. The isolated power supply has the advantages of strong anti-interference capability, convenience in realizing multi-path output, high safety and easiness in realizing wide-range voltage input; meanwhile, the damage to the load after the power supply is abnormal is small. The normal and reliable work of the electronic fuse can be well guaranteed.
The isolation power supply is mainly characterized in that the isolation power supply has a topological form of an isolation transformer and can be divided into forms of flyback, forward, half bridge, full bridge and the like. In this form, different voltage conversion forms are possible, such as Boost (Boost), Buck (Buck), Boost-Buck (Boost-Buck) hybrid forms, and the like.
The following presents a simplified description of a preferred embodiment of the isolated voltage isolated topology of the present invention.
FIG. 4 shows one embodiment of a power management unit of the present invention; it can be seen from the figure that it is a forward multiple output form, here two outputs. The device comprises a main coil L1m and two secondary coils L11 and L12; and their winding directions are identical. And a switch S11 is connected in series with the primary winding. The main coil L1m is connected with an input voltage; the two secondary coils L11 and L12 are connected to voltage output 1 and voltage output 2, respectively;
in particular, different modes are possible:
for example, one: in practice, the input voltage is the external power supply; the voltage output 1 and the voltage output 2 are respectively connected with a first voltage and a second voltage after subsequent processing.
For example two: the input voltage is connected with the first voltage, and one of the outputs is respectively connected with the second voltage after subsequent processing. The connection relationship between the first voltage and the second voltage may be changed and set according to the actual environment.
The subsequent processing here is the aforementioned mixed form of Boost (Boost), Buck (Buck) and Boost-Buck (Boost-Buck)
Fig. 5 shows a second embodiment of the power management unit of the present invention; it can be seen from the figure that it is a forward multiple output form. The biggest difference from fig. 4 is the winding manner of the primary coil and the secondary coil. And will not be described in detail here.
In particular, the power management unit 15 may be implemented by a separate integrated circuit chip, such as Adum5000, SN6505, and the like.
It is emphasized that the technical solution of the present invention can be implemented in a single chip by an integrated circuit process; meanwhile, in order to reduce the difficulty of research and development and improve the yield, part of the units can also be realized by using the existing single chip, such as the power management unit.
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 (27)
1. An electronic fuse with power management function, comprising:
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, a current detection unit and a power supply management 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 power supply management unit provides working voltage for other units in the electronic fuse;
the working voltage is the working voltage of a first power domain and the working voltage of a second power domain;
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.
2. The electronic fuse with power management function according to claim 1, wherein: the power management unit is an isolated power supply.
3. The electronic fuse with power management function according to claim 2, wherein: the isolation power supply is in a flyback or forward mode.
4. The electronic fuse with power management function according to claim 2, wherein: the isolated power supply is in a half-bridge or full-bridge form.
5. The electronic fuse with power management function according to claim 2, wherein: the isolation power supply is in a multi-output forward or flyback form.
6. The electronic fuse with power management function according to claim 5, wherein: the isolation power supply comprises a primary coil L1m and two secondary coils L11 and L12; the main coil is connected in series with a switch; the main coil L1m is connected with an input voltage; the two secondary windings L11 and L12 are connected to voltage output 1 and voltage output 2, respectively.
7. The electronic fuse with power management function according to claim 6, wherein: the winding directions of the main coil and the secondary coil of the isolated power supply are consistent or opposite.
8. The electronic fuse with power management function according to claim 6, wherein: the input voltage of the isolation power supply is an external power supply, and the voltage output 1 and the voltage output 2 are respectively connected with a first voltage and a second voltage after subsequent processing.
9. The electronic fuse with power management function according to claim 6, wherein: the isolation power supply input voltage is connected with a first voltage; one of the outputs is connected with a second voltage after subsequent processing; or
The isolation power supply input voltage is connected with a second voltage; one of the outputs is connected to a first voltage after subsequent processing.
10. The electronic fuse with power management function according to claim 2, wherein: the power management unit is an integrated circuit chip.
11. The electronic fuse with power management function according to claim 10, wherein: the integrated circuit chip is either Adum5000 or SN 6505.
12. The electronic fuse with power management function 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.
13. The electronic fuse with power management function according to claim 1, wherein: the path unit comprises a driving unit and a power switch 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.
14. The electronic fuse with power management function according to claim 13, 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.
15. The electronic fuse with power management function according to claim 13, wherein: the power switch tube is formed by a plurality of sub power switch tubes in parallel.
16. The electronic fuse with power management function according to claim 13, wherein: the power switch tube is an electric control switch device.
17. The electronic fuse with power management function according to claim 16, wherein: the electric control switch device is as follows: crystal valve tube, silicon controlled rectifier, relay or contactor.
18. The electronic fuse with power management function according to claim 13, wherein: the power switch tube is a junction field effect tube or a metal oxide semiconductor field effect tube.
19. The electronic fuse with power management function of claim 18, wherein: the junction field effect transistor is an N-channel junction field effect transistor or a P-channel junction field effect transistor.
20. The electronic fuse with power management function of claim 18, wherein: the metal oxide semiconductor field effect transistor is an N-channel junction field effect transistor or a P-channel junction field effect transistor.
21. The electronic fuse with power management function of claim 20, wherein: the metal oxide semiconductor field effect transistor is an enhanced insulated gate field effect transistor or a depletion insulated gate field effect transistor.
22. The electronic fuse with power management function of claim 18, wherein: when the metal oxide semiconductor field effect transistor is a P-channel junction field effect 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.
23. The electronic fuse with power management functionality according to claim 22, wherein: 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.
24. The electronic fuse with power management function 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.
25. The electronic fuse with power management functionality according to claim 24, wherein: the current detection unit is a resistor.
26. The electronic fuse with power management functionality according to claim 24, wherein: the current detection unit is a current transformer.
27. The electronic fuse with power management function of claim 26, wherein: the current transformer is one of a Hall device, a TMR, a fluxgate and a Rogowski coil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110311352A (en) * | 2019-08-09 | 2019-10-08 | 无锡启腾电子科技有限公司 | A kind of electrical fuse of self-powered management function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110311352A (en) * | 2019-08-09 | 2019-10-08 | 无锡启腾电子科技有限公司 | A kind of electrical fuse of self-powered management function |
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