CN117762182A - Circuit with current protection - Google Patents
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Abstract
The present application relates to a circuit with current protection. The circuit comprises a first current protection module, an external adjusting device, a current adjusting module and a second current protection module, wherein the first current protection module is connected with the external adjusting device, the external adjusting device is connected with the current adjusting module, and the current adjusting module is connected with the second current protection module, wherein: the first current protection module is used for detecting whether the input current is normal or not, and outputting the input current to an external adjusting device when the input current is normal; the external adjusting device is used for adjusting the input current to obtain a first current, and when the first current does not reach the preset output current, the first current is input to the current adjusting module; the current adjusting module is used for adjusting the first current to obtain a second current, and when the second current does not reach the preset output current, the second current is input to the second current protection module; the second current protection module is used for performing short-circuit protection according to the second current.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a circuit with current protection.
Background
Along with the continuous development of the electronic information industry in recent years, various electric appliances, cloud computing and AI are the directions of more and more attention in the future, wherein the electronic products which are used in the home including automobile electronics, new energy and cloud computing are also brought into various fields of society, and the rapid development of the industry is promoted; new energy, communication products and automobile electronics are increasingly required to ensure the reliability and stable power supply design of the products, and are the power and energy sources for the work of many communication products. Particularly, in the long-term full-load use process, the product is easily damaged due to the influence of the product and external factors along with the operation of the product.
In the existing scheme, the traditional low dropout linear voltage regulator is mainly utilized, the voltage difference voltage is amplified by an amplifier through comparison with a reference voltage, and finally the ratio of the output voltage to the input voltage is kept unchanged through adjustment of a power tube, so that stable voltage output is generated. The characteristic impedance of the regulating tube is mainly utilized to keep the output stable for a long time, and when the input voltage rises or the load current decreases, the preset value is regulated and repaired according to feedback to make the input voltage stable. The scheme has the advantages of smaller output controllable range, complex circuit design and higher cost.
Disclosure of Invention
Based on the above, it is necessary to provide a circuit with current protection, which can be turned off in time by abnormal current detection, so as to prevent damage to the system, and has simple circuit design and reduced cost.
The utility model provides a circuit of electrified current protection, includes first current protection module, outside adjusting device, current regulation module and second current protection module, and first current protection module is connected with outside adjusting device, and outside adjusting device is connected with current regulation module, and current regulation module is connected with second current protection module, wherein:
the first current protection module is used for detecting whether the input current is normal or not, and outputting the input current to an external adjusting device when the input current is normal;
the external adjusting device is used for adjusting the input current to obtain a first current, and when the first current does not reach the preset output current, the first current is input to the current adjusting module;
the current adjusting module is used for adjusting the first current to obtain a second current, and when the second current does not reach the preset output current, the second current is input to the second current protection module;
the second current protection module is used for performing short-circuit protection according to the second current.
In one embodiment, the circuit further comprises a voltage regulator connected to the external regulator, wherein: the external adjusting device is used for outputting the first current to the voltage stabilizer when the first current reaches the preset output current, and the voltage stabilizer is used for outputting the first current.
In one embodiment, the voltage regulator is further connected to a current regulation module, wherein: the current adjusting module is used for outputting the second current to the voltage stabilizer when the second current reaches the preset output current, and the voltage stabilizer is used for outputting the second current.
In one embodiment, the circuit further includes a first resistor, the first resistor being connected to the voltage regulator, wherein: the first resistor is used for receiving input current, blocking the input current to obtain third current, inputting the third current to the voltage stabilizer, and outputting the third current by the voltage stabilizer.
In one embodiment, the first current protection module comprises a second resistor and a first triode, an emitter of the first triode is connected with an input end of a positive electrode of the power supply, a base of the first triode is connected with the second resistor, and a collector of the first triode is connected with the voltage stabilizer.
In one embodiment, the external adjusting device is a second triode, an emitter of the second triode is connected with a base electrode of the first triode, a base electrode of the second triode is connected with the current adjusting module, and a collector of the second triode is connected with the second current protecting module.
In one embodiment, the current adjusting module comprises a first capacitor and an adjustable resistor, one end of the first capacitor is connected with the base electrode of the second triode, the other end of the first capacitor is connected with the adjustable resistor, and the adjustable resistor is connected with the voltage stabilizer.
In one embodiment, the current adjusting module comprises a second capacitor, a third resistor and a first diode, the third resistor of the second capacitor is connected with the third resistor, the third resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the voltage stabilizer and the second current protecting module respectively.
In one embodiment, the second current protection module comprises a fourth resistor and a second diode, one end of the fourth resistor is connected with the current regulation module, the other end of the fourth resistor is connected with the anode of the second diode, and the cathode of the second diode is connected with the collector of the second triode.
In one embodiment, the circuit is applied to a server.
The circuit with current protection comprises a first current protection module, an external adjusting device, a current adjusting module and a second current protection module, wherein the first current protection module is connected with the external adjusting device, the external adjusting device is connected with the current adjusting module, and the current adjusting module is connected with the second current protection module, wherein: the first current protection module is used for detecting whether the input current is normal, when the input current is normal, the input current is output to the external adjusting device, the external adjusting device is used for adjusting the input current to obtain the first current, when the first current does not reach the preset output current, the first current is input to the current adjusting module, the current adjusting module is used for adjusting the first current to obtain the second current, when the second current does not reach the preset output current, the second current is input to the second current protection module, and the second current protection module is used for carrying out short-circuit protection according to the second current. Therefore, the circuit can be effectively protected through the first current protection module and the second current protection module, abnormal current can be timely judged and short-circuit protection is achieved, circuit damage is prevented, circuit design is simple, cost can be reduced, and the circuit is suitable for various application scenes.
Drawings
FIG. 1 is a schematic diagram of a circuit with current protection in one embodiment;
FIG. 2 is a schematic diagram of a functional block diagram of a circuit with current protection in one embodiment;
FIG. 3 is a schematic diagram of a current regulation module according to one embodiment;
FIG. 4 is a schematic diagram of a circuit with current protection in one embodiment;
FIG. 5 is a schematic diagram of an adjustable voltage in one embodiment;
FIG. 6 is a schematic diagram of an adjustable voltage in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a circuit 100 with current protection is provided, comprising a first current protection module 102, an external adjustment device 104, a current regulation module 106, and a second current protection module 108, the first current protection module 102 being connected to the external adjustment device 104, the external adjustment device 104 being connected to the current regulation module 106, the current regulation module 106 being connected to the second current protection module 108, wherein:
the first current protection module 102 is configured to detect whether an input current is normal, and output the input current to the external adjustment device 104 when the input current is normal;
the external adjusting device 104 is configured to adjust the input current to obtain a first current, and when the first current does not reach the preset output current, input the first current to the current adjusting module 106;
the current adjusting module 106 is configured to adjust the first current to obtain a second current, and when the second current does not reach the preset output current, input the second current to the second current protection module 108;
the second current protection module 108 is used for performing short-circuit protection according to the second current.
The first current protection module is used for detecting input current and protecting the input current from overcurrent, and when the input current is abnormal, the first current protection module performs short-circuit protection in order to ensure the safety of the circuit and prevent the circuit from being damaged. When the input current is normal, the input current is input to an external adjusting device and a current adjusting module for current adjustment, and the second current protection module is used for detecting the adjusted current and performing overcurrent protection, when the adjusted current is abnormal, in order to avoid damage to the circuit again, the second current protection module performs short-circuit protection. That is, the first current protection module and the second current protection module timely shut down the circuit through abnormal detection current, so that the circuit is prevented from being damaged.
As can be seen from the above embodiments, the circuit 100 with current protection includes two current protection steps, the first current protection step is the first current protection step 102, the second current protection step is the second current protection step 108, the first current protection step 102 detects the input current, and detects whether the input current is too large, and the circuit is easily damaged if the input current is too large, and when the input current is detected to be too large, the first current protection step 102 directly performs short-circuit protection. Specifically, a preset input current threshold is obtained, the preset input current threshold may be predetermined according to an actual service requirement, an actual product requirement or an actual application scenario, the first current protection module 102 compares the input current with the preset input current threshold to determine whether the input current is an abnormal current, when the input current is greater than the preset input current threshold, unavoidable damage may be brought, and the first current protection module 102 directly performs short-circuit protection. Conversely, when the input current is smaller than the preset input current threshold, it is indicated that the input current is a normal current, and the first current protection module 102 inputs the input current to the external adjustment device 104.
When the input current is detected to be normal, the input current is output to the external adjusting device 104, the external adjusting device 104 adjusts the input current to obtain an adjusted first current, and at this time, it is required to detect whether the adjusted first current meets the requirement of the output current, that is, whether the first current meets the preset output current, where the preset output current can be obtained according to the actual service requirement, the actual product requirement, or the actual application scenario. In one embodiment, the external adjustment device may be a triode.
Further, when the first current is detected to reach the preset output current, the external adjustment device 104 outputs the adjusted first current, whereas when the first current is detected not to reach the preset output current, the external adjustment device 104 inputs the first current to the current adjustment module 106. The current adjusting module 106 adjusts the first current input by the external adjusting device 104 to obtain an adjusted second current, and at this time, it needs to detect whether the adjusted second current meets the requirement of the output current, that is, whether the first current meets the preset output current.
Finally, when the second current is detected to reach the preset output current, the current adjusting module 106 outputs the adjusted second current, otherwise, when the second current is detected not to reach the preset output current, the current adjusting module 106 inputs the second current to the second current protection module 108, and the second current protection module 108 directly performs short-circuit protection according to the second current in order to avoid damaging the circuit.
The circuit with current protection comprises a first current protection module, an external adjusting device, a current adjusting module and a second current protection module, wherein the first current protection module is connected with the external adjusting device, the external adjusting device is connected with the current adjusting module, and the current adjusting module is connected with the second current protection module, wherein: the first current protection module is used for detecting whether the input current is normal, when the input current is normal, the input current is output to the external adjusting device, the external adjusting device is used for adjusting the input current to obtain the first current, when the first current does not reach the preset output current, the first current is input to the current adjusting module, the current adjusting module is used for adjusting the first current to obtain the second current, when the second current does not reach the preset output current, the second current is input to the second current protection module, and the second current protection module is used for carrying out short-circuit protection according to the second current. Therefore, the circuit can be effectively protected through the first current protection module and the second current protection module, abnormal current can be timely judged and short-circuit protection is achieved, circuit damage is prevented, circuit design is simple, cost can be reduced, and the circuit is suitable for various application scenes.
In one embodiment, the circuit further comprises a voltage regulator connected to the external regulator, wherein:
the external adjusting device is used for outputting the first current to the voltage stabilizer when the first current reaches a preset output current;
the voltage stabilizer is used for outputting a first current.
The current also comprises a voltage stabilizer, the voltage stabilizer is connected with the external adjusting device, the voltage stabilizer can enable the voltage to be stabilized at a set value, and when the first current adjusted by the external adjusting device reaches a preset output current, the first current can be directly output through the voltage stabilizer connected with the external adjusting device. Specifically, when the external adjusting device detects that the adjusted first current reaches the preset output current, the external adjusting device outputs the first current to the voltage stabilizer and outputs the first current through the voltage stabilizer. The voltage stabilizer is a device for stabilizing voltage, and can directly output through the voltage stabilizer, and can also adjust the voltage through the voltage stabilizer, so as to adjust current.
In one embodiment, the voltage regulator is further coupled to the current regulation module, wherein:
the current adjusting module is used for outputting the second current to the voltage stabilizer when the second current reaches the preset output current;
the voltage stabilizer is used for outputting a second current.
The voltage stabilizer is also connected with the current regulating module, and when the second current regulated by the current regulating module reaches the preset output current, the second current can be directly output through the voltage stabilizer connected with the current regulating module. Specifically, when the current adjusting module detects that the adjusted second current reaches the preset output current, the second current is output to the voltage stabilizer and is output through the voltage stabilizer. Specifically, the preset output current may be obtained by obtaining the preset output current in advance according to an actual service requirement, an actual product requirement or an actual application scenario, when the second current output by the current adjusting module reaches the preset output current, the second current may be directly output through the voltage stabilizer, otherwise, if the second current does not reach the preset output current, the second current is output to the second current protection module connected with the current adjusting module.
In one embodiment, the circuit further comprises a first resistor connected to the voltage regulator, wherein:
the first resistor is used for receiving input current, performing blocking action on the input current to obtain third current, and inputting the third current to the voltage stabilizer;
the voltage stabilizer is used for outputting a third current.
The circuit further comprises a first resistor, the first resistor is used for limiting input current and blocking the input current, the first resistor is connected with the voltage stabilizer and used for receiving the input current, blocking the input current, reducing the input current, obtaining third current and inputting the third current to the voltage stabilizer. Further, when the third current output by the first resistor reaches the output current requirement, the voltage stabilizer outputs the third current.
In one embodiment, the first current protection module comprises a second resistor and a first triode, an emitter of the first triode is connected with an input end of a positive electrode of the power supply, a base of the first triode is connected with the second resistor, and a collector of the first triode is connected with the voltage stabilizer.
The individual modules of the circuit of the embodiments of the present application are described in more detail below with reference to fig. 2, as shown in fig. 2.
The first current protection module 202 includes a second resistor R1 and a first triode Q1, where the first triode Q1 is divided into three poles, which are an emitter, a base, and a collector, the emitter of the first triode Q1 is connected with the positive input end of the power supply, the base of the first triode Q1 is connected with the second resistor R1, and the collector of the first triode Q1 is connected with one end of the voltage regulator. In one embodiment, the first triode Q1 may be a PNP transistor, and forms an overcurrent protection circuit with the second resistor R1, and when the input current is too large, the first current protection module performs short-circuit protection, so as to implement an overcurrent protection function, and protect the circuit from damage.
The first triode Q1 may be a PNP transistor, is a semiconductor device for controlling current, has a current amplifying function, and is a core element of an electronic circuit. The triode is characterized in that two PN junctions which are very close to each other are manufactured on a semiconductor substrate, the whole semiconductor is divided into three parts by the two PN junctions, the middle part is a base region, the two side parts are an emitter region and a collector region, and PNP and NPN are arranged. In this embodiment, the first transistor Q1 may be a PNP transistor.
The first triode Q1 may include three poles, which are an emitter, a base and a collector, where the base may be regarded as a switch of the triode and is also an amplified current portion during amplification, the collector amplifies by the triode, the current of the collector may be a certain multiple of the base current, and the emitter current is equal to the sum of the base and collector currents, and may also be used to determine the current direction.
The basic description of the triode is a current control device, namely, a conduction switch is controlled by the current of a base electrode, the base electrode has current, and the triode can be conducted, but in the actual analysis and use process, the angle of voltage can be used for analysis, because in general, the base electrode has current as long as the voltage reaches the conduction voltage drop of 0.7V (silicon tube 0.7V/germanium tube 0.3V).
In one embodiment, the external adjusting device is a second triode, an emitter of the second triode is connected with a base electrode of the first triode, a base electrode of the second triode is connected with the current adjusting module, and a collector of the second triode is connected with the second current protecting module.
As shown in fig. 2, the external adjusting device 204 is a second triode Q2, the second triode Q2 is divided into three triodes, which are an emitter, a base and a collector, the emitter of the second triode Q2 is connected with the base of the first triode Q1, the base of the second triode Q2 is connected with the current adjusting module 206, and the collector of the second triode is connected with the second current protecting module 208.
In one embodiment, the current adjusting module comprises a first capacitor and an adjustable resistor, one end of the first capacitor is connected with the base electrode of the second triode, the other end of the first capacitor is connected with the adjustable resistor, and the adjustable resistor is connected with the voltage stabilizer.
As shown in fig. 2, the current adjusting module 206 includes a first capacitor C1 and an adjustable resistor VR1, one end of the first capacitor C1 is connected with the base of the second triode Q2, the other end of the first capacitor C1 is connected with the adjustable resistor VR1 and grounded, where the first capacitor C1 is a resistor used for storing energy, the adjustable resistor VR1 can be adjusted, the adjustable resistor VR1 can enable current to meet the requirement of output current, the adjustable resistor VR1 is respectively connected with the voltage stabilizer and the second current protection module 208, when the current output by the adjustable resistor VR1 meets the requirement of output current, the current can be directly output through the voltage stabilizer, otherwise, if the current output by the adjustable resistor VR1 does not meet the requirement of output current, the current is output to the second current protection module 208 for current protection.
The adjustable resistor VR1 is also called a variable resistor, the English of the variable resistor is Rheostat, the adjustable resistor is a resistor type, and the resistance value of the adjustable resistor can be manually adjusted to meet the requirement of a circuit. The adjustable resistor can be divided into a plurality of different models and types according to the size of the resistance value, the adjusting range, the adjusting form, the manufacturing process, the manufacturing material, the volume size and the like, and the adjustable resistor is divided into: an electronic component adjustable resistor, a porcelain disc adjustable resistor, a patch adjustable resistor, a wire winding adjustable resistor and the like. The nominal value of the adjustable resistor is a resistance value which can be adjusted to the maximum standard, in theory, the resistance value of the adjustable resistor can be adjusted to any value within 0 and the nominal value, but the adjustable resistor is not easy to reach any requirement by 100% because of the practical structure, the design precision requirement and the like, and only is basically adjusted within an allowable range, so that the resistance value is changed.
In one embodiment, the current regulation module comprises a second capacitor, a third resistor and a first diode, wherein the second capacitor is connected with the third resistor, the third resistor is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the voltage stabilizer and the second current protection module.
As shown in fig. 3, the current adjustment module 206 may further include a second capacitor C2, a third resistor R2, and a first diode D1, where the second capacitor C2 is connected to the third resistor R2, the third resistor R2 is connected to an anode of the first diode D1, and a cathode of the first diode D1 is connected to the voltage stabilizer VS1 and the second current protection module 208, respectively.
The capacitor is a device with two conductors close to each other and a layer of non-conductive insulating medium sandwiched between the two conductors, and when a voltage is applied between the two electrode plates of the capacitor, the capacitor stores electric charge. The capacitance of a capacitor is equal in value to the ratio of the amount of charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance of the capacitor is farad (F). The capacitive element is generally indicated by the letter C in the circuit diagram.
In one embodiment, the second current protection module comprises a fourth resistor and a second diode, one end of the fourth resistor is connected with the current regulation module, the other end of the fourth resistor is connected with the anode of the second diode, and the cathode of the second diode is connected with the collector of the second triode.
In one embodiment, the circuit is applied to a server.
As shown in fig. 2, the second current protection module 208 may include a fourth resistor R3 and a second diode D2, where the second diode D2 includes two poles, that is, an anode and a cathode, respectively, and the current flows from the anode to the cathode, and one end of the fourth resistor R3 is connected to the current adjustment module 206, specifically, one end of the fourth resistor R3 is connected to the adjustable resistor VR1 of the current adjustment module 206 or the cathode of the first diode D1 in fig. 3.
Further, the other end of the fourth resistor R3 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the collector of the second transistor Q2. In fact, the second diode is now in the reverse state.
The second diode D2 is an electronic device made of semiconductor material (silicon, selenium, germanium, etc.). The diode has two electrodes, an anode, also called anode; the negative electrode, called the cathode, turns on the diode when a forward voltage is applied between the two poles of the diode, and turns off the diode when a reverse voltage is applied. The on and off of the diode corresponds to the on and off of the switch.
The diode has unidirectional conductivity, and the current flows from the anode to the cathode through the pipe when the diode is conducted. Diodes are one of the earliest emerging semiconductor devices and are very widely used. In particular, in various electronic circuits, diodes, resistors, capacitors, inductors and other components are reasonably connected to form circuits with different functions, so that the functions of rectifying alternating current, detecting modulated signals, limiting amplitude, clamping, stabilizing power supply voltage and the like can be realized.
The main principle of the diode is that the diode is formed by adding a lead wire and packaging on a PN junction by utilizing the unidirectional conductivity of the PN junction.
The second diode D2 may be a transistor diode, which is a PN junction formed by a P-type semiconductor and an N-type semiconductor, and has space charge layers formed on both sides of an interface thereof, and a self-built electric field is built. When no external voltage exists, the diffusion current caused by the concentration difference of carriers at two sides of the PN junction is equal to the drift current caused by the self-built electric field, and the PN junction is in an electric balance state.
When the outside has forward voltage bias, the mutual cancellation effect of the outside electric field and the self-built electric field increases the diffusion current of the current carrier to cause forward current. When the external reverse voltage bias exists, the external electric field and the self-built electric field are further enhanced, and reverse saturation current which is irrelevant to the reverse bias voltage value in a certain reverse voltage range is formed.
When the applied reverse voltage is high to a certain degree, the electric field intensity in the PN junction space charge layer reaches a critical value to generate a multiplication process of carriers, a large number of electron hole pairs are generated, and a reverse breakdown current with a large value is generated, which is called a breakdown phenomenon of a diode. Reverse breakdown of the PN junction is divided into zener breakdown and avalanche breakdown.
In a specific embodiment of the voltage stabilizing circuit with current protection, as shown in fig. 4, a schematic structural diagram of a circuit is provided, C1 is an anti-interference capacitor, and since the filter capacitor is connected with the voltage stabilizer in a longer way, oscillation is easy to generate, so that the input side of the power supply needs to be connected with the anti-vibration capacitor, that is, in order to bypass the high-frequency interference pulse, the three-terminal voltage stabilizer works stably. C2 is an anti-self-excitation capacitance for improving the transition characteristics from the load to the power supply; the output end is connected with the capacitor C3, in order to reduce low-frequency interference of the output end of the regulated power supply, which is led by the input power supply, a protection diode D1 is connected between the output and the input for protecting the regulated power supply, and when the input is accidentally shorted, a discharging path is provided for the output capacitor C3, so that the voltage at two ends of the C3 is prevented from acting on the emission junction of the regulating tube, and the emission junction is broken down to damage the regulated power supply.
Aiming at the high-output current short-circuit protection voltage stabilizing circuit, the used PNP tube Q2 and the current detection resistor R1 form an overcurrent protection circuit, and Q1 is an external adjusting tube. R2 is used to set the turn-on threshold voltage of Q1. Assuming that IO1 is the output current of the voltage stabilizer, IO2 is the maximum current provided by an external adjusting tube, when the output is in short circuit, the voltage drop on R1 is larger than the conduction voltage drop of Q2, Q2 is conducted, and Q1 is cut off, so that the overcurrent protection function is realized.
As shown in FIG. 4, R3 and VR1 are sampling resistors (VR 1 is adjustable control), VS1 is selectable according to the requirement, the value is generally set at the minimum load current of IL=5-10 mA, at this time, R3 value can be obtained by IL=Vvs 1/R3, C2 can filter out the ripple waves at two ends of VR1, so that the ripple waves cannot be amplified and then V is obtained out Outputting the end; d2 is a protection diode, once V in And the end is short-circuited, and a discharge loop is provided for C2 by D1, so that the C2 is prevented from damaging the chip due to internal discharge of the voltage stabilizer VS 1.
Approximately calculating the output voltage: vout=vref (VR 1/r3+1);
when VR1 is zero, vout is equal to Vref and the output is minimum; vout is maximized when VR1 is maximized.
When the load is unchanged, if the input voltage Uin increases, uout increases, and the transistor base potential Ub1 increases by the voltage division of VR1 and R3. Since Ue1 is unchanged, ube1 rises. The collector current Ic1 increases, and Uc1 decreases. Since Vt2 is an emitter follower, ue2 also drops with, i.e., uout drops, thereby maintaining Uout unchanged,
when UI is fixed, if the load increases to decrease the output voltage UO, the voltage division of R1 and R2 will decrease the feedback voltage Ub1, the emitter potential is the stable voltage at the two ends of the zener diode, and will remain unchanged, after the two voltages are compared, the emitter voltage drop Ube1 decreases, so Ic1 decreases Uc1 to increase, and Uc1 is the adjusted base potential, so the emitter potential Ue2 (i.e. Uout) follows Ue1 to increase, the increase of Uout compensates for the decrease of Uout, i.e. the output voltage remains unchanged.
The current adjustable voltage stabilizing circuit is actually a voltage negative feedback circuit, the feedback voltage Ub1 is taken out from the output voltage Uout and compared with the reference voltage Vref, and then the difference voltage is amplified to control the adjusting tube, and the tube voltage drop is adjusted to restore the output voltage to the original stable value.
Meanwhile, when properly adjusted, the voltage can be continuously adjusted from the minimum value of 0V to the maximum value; as shown in FIG. 5, when the output voltage starts to be regulated from the lowest 0V, the lower end of R2 should be connected with Vref to obtain a negative voltage, and the point can be provided by a voltage stabilizing tube VD1, and VD1 is connected with a-V0 power supply through a current limiting resistor R1. When R2 is zero, the output voltage is 0; when R2 is maximum, the output voltage is Vref (1+R2/R3) -Vref. In fig. 6, since the accuracy of the output voltage may be reduced due to the influence of the resistor and the diode, the diode may select the zener diode D1 with temperature compensation, the zener diode has a regulated voltage Uz, and the output voltage is (vref+uz) (1+r2/R1) when the output Vout is greater than Uz.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. The utility model provides a circuit with current protection, its characterized in that includes first current protection module, outside adjustment device, current regulation module and second current protection module, first current protection module with outside adjustment device is connected, outside adjustment device with current regulation module is connected, current regulation module with second current protection module is connected, wherein:
the first current protection module is used for detecting whether the input current is normal or not, and outputting the input current to the external adjusting device when the input current is normal;
the external adjusting device is used for adjusting the input current to obtain a first current, and when the first current does not reach the preset output current, the first current is input to the current adjusting module;
the current adjusting module is used for adjusting the first current to obtain a second current, and when the second current does not reach the preset output current, the second current is input to the second current protection module;
the second current protection module is used for performing short-circuit protection according to the second current.
2. The circuit of claim 1, further comprising a voltage regulator coupled to the external adjustment device, wherein:
the external adjusting device is used for outputting the first current to the voltage stabilizer when the first current reaches the preset output current;
the voltage stabilizer is used for outputting the first current.
3. The circuit of claim 2, wherein the voltage regulator is further coupled to the current regulation module, wherein:
the current adjusting module is used for outputting the second current to the voltage stabilizer when the second current reaches the preset output current;
the voltage stabilizer is used for outputting the second current.
4. The circuit of claim 2, further comprising a first resistor coupled to the voltage regulator, wherein:
the first resistor is used for receiving the input current, performing a blocking effect on the input current to obtain a third current, and inputting the third current to the voltage stabilizer;
the voltage stabilizer is used for outputting the third current.
5. The circuit of any of claims 2-4, wherein the first current protection module comprises a second resistor and a first triode, an emitter of the first triode is connected with a positive input terminal of a power supply, a base of the first triode is connected with the second resistor, and a collector of the first triode is connected with a voltage regulator.
6. The circuit of claim 5, wherein the external adjustment device is a second triode, an emitter of the second triode is connected to a base of the first triode, a base of the second triode is connected to the current adjustment module, and a collector of the second triode is connected to the second current protection module.
7. The circuit of claim 6, wherein the current regulation module comprises a first capacitor and an adjustable resistor, wherein one end of the first capacitor is connected to the base of the second transistor, the other end of the first capacitor is connected to the adjustable resistor, and the adjustable resistor is connected to the voltage regulator.
8. The circuit of claim 6, wherein the current regulation module comprises a second capacitor, a third resistor and a first diode, the second capacitor is connected with the third resistor, the third resistor is connected with an anode of the first diode, and a cathode of the first diode is connected with the voltage stabilizer and the second current protection module respectively.
9. The circuit according to claim 7 or 8, wherein the second current protection module comprises a fourth resistor and a second diode, one end of the fourth resistor is connected with the current regulation module, the other end of the fourth resistor is connected with an anode of the second diode, and a cathode of the second diode is connected with a collector of the second triode.
10. The circuit of claim 1, wherein the circuit is applied to a server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311837495.9A CN117762182A (en) | 2023-12-28 | 2023-12-28 | Circuit with current protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311837495.9A CN117762182A (en) | 2023-12-28 | 2023-12-28 | Circuit with current protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117762182A true CN117762182A (en) | 2024-03-26 |
Family
ID=90316141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311837495.9A Pending CN117762182A (en) | 2023-12-28 | 2023-12-28 | Circuit with current protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117762182A (en) |
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2023
- 2023-12-28 CN CN202311837495.9A patent/CN117762182A/en active Pending
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