CN104617558A - Power supply short circuit protection circuit - Google Patents
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Abstract
The invention provides a power supply short circuit protection circuit comprising a voltage detection module, a switching control module, and a time-delay holding module. The voltage detection module is used for detecting a voltage related to the short circuit of an output terminal of a power supply. Whether the output terminal of the power supply is short-circuited is judged based on the detected voltage. When that the output terminal of the power supply is short-circuited is judged, a control signal is output to a terminal which controls a control IC to output or stop outputting a PWM signal. According to the power supply short circuit protection circuit, no matter if the control IC of a power circuit has a short circuit protection function, the control IC can be reliably enabled to stop outputting the PWM signal to achieve the purpose of short circuit protection, and the effective value of an output current when the output of a power supply is short-circuited can be reduced.
Description
Technical field
The present invention relates to a kind of output short circuit protection circuit of power supply.
Background technology
Power supply, as the requisite part of electrical equipment, is one of important guarantee of electrical equipment normal operation always.Particularly, Switching Power Supply has that volume is little, lightweight, conversion efficiency high, is widely used in the various electronic equipments in the fields such as Industry Control, communication office, household consumption.Power supply is generally formed by for the control integration circuit (hreinafter referred to as control IC) of pulse width modulation (Pulse Width Modulation:PWM), the element such as switch element and transformer such as power field effect transistor or triode.
According to the difference of electronic equipment, the power supply that this electronic equipment uses also adopts different technical specifications and index, especially the technical specification of overvoltage, the various defencive function such as overheated and index.When the load of power supply is broken down, output current often increases, and output even can be caused to be short-circuited, and now, needs promptly power cutoff, prevents excessive electric current from burning out other element or the circuit of equipment.Therefore, output short circuit protection function as power supply very important function and receive much concern.
In order to reach short-circuit protection object, usually, control IC can detect the signal relevant to output end voltage or electric current, and judges whether to occur short-circuit state, to stop exporting or output pwm signal.At present, a lot of control IC self just possesses the overpowering short-circuit protection function of primary side.To detect the primary side control IC voltage value of reflection output end voltage, as shown in Figure 1, short circuit is there is at output, and when short circuit power output reaches primary side overpowering threshold value, the voltage for the primary coil T1 two ends powering to control IC of transformer starts to decline, thus, via resistance R7, the voltage drop of the power end VCC of control IC is directly supplied after rectifier diode D1 and smoothing capacity C3, when power end VCC drops to below the threshold value specified by control IC, the short-circuit protection function work of control IC inside, stop output pwm signal, power supply does not export.Wherein, two dividing potential drops resistance R1, R2 of left part in FIG, when power initiation, charge to electric capacity C3, starts to make control IC.
But, be low-voltage in the output of power supply, when big current, such as, at output voltage at below 5V, when output current is more than 10A, when there is short circuit in the output of power circuit, because the leakage inductance of transformer is large, or the reasons such as secondary short circuited output impedance is excessive, although the change of power output reaches the overpowering threshold value in elementary side during short circuit, but, the voltage at the primary coil T1 two ends of the transformer in Fig. 1 can not drop to makes control IC stop below the threshold value of the regulation of output pwm signal, even the control IC possessing the overpowering short-circuit protection function of primary side can not realize short-circuit protection.
For another example, when power supply is multiple-channel output, there is short circuit in a road wherein, when other road output no-load, although short circuit power output can make the elementary side of power supply reach overpowering threshold value, the voltage of the power end VCC of the control IC of primary side can not drop to makes control IC stop below the threshold value of the regulation of output pwm signal.Even the control IC possessing the overpowering short-circuit protection function of primary side can not realize short-circuit protection.
Summary of the invention
The present invention proposes in view of the above problems, the object of the invention is to, and can reliably make control IC stop the power protecting circuit of output pulse width modulation signal when providing a kind of output at power supply to produce short circuit.
According to a technical scheme of the present invention, the invention provides a kind of power supply short-circuit protective circuit, it, when the output of the power supply with the control IC for output pulse width modulation signal produces short circuit, makes described control IC stop output pulse width modulation signal.Described power supply short-circuit protective circuit comprises: voltage detection module, with detection, its first input end reflects that the terminal of the voltage of the short-circuit state of the output of power supply is connected, second input is connected with the terminal receiving reference voltage, the result that the voltage conditions associated based on the short circuit of the output to described reflection power supply and described reference voltage compare, judges signal from output output detections; Time delay keeps module, and its input is connected with the output of described voltage detection module, judges signal, from output output switching signal based on described detection; Switch control module, its input and described time delay keep the output of module to be connected, the control terminal that output exported/stopped output pulse width modulation signal with the described control IC of control is connected, according to the switching signal keeping module from described time delay, export from the output be connected with described control terminal and control the signal that described control IC exported/stopped output pulse width modulation signal.Described time delay keeps module to judge signal based on described detection, described switching signal is exported to described switch control module, described switch control module is according to described switching signal, within the delay time being kept Module Specification by described time delay, described control IC is made to stop output pulse width modulation signal, further, after described delay time, described control IC output pulse width modulation signal is made.
Preferably, described voltage detection module has: the divider resistance that two or more is connected in series, and the upstream extremity being positioned at the divider resistance of most upstream is the first input end of described voltage detection module, is positioned at the downstream ground connection of the divider resistance of most downstream.To the comparing element that the voltage obtained by described divider resistance dividing potential drop and described reference voltage are compared, the tie point selected in more than one tie point between first end with the divider resistance be connected in series from described two or more is connected, second end is the second input of described voltage detection module, and the 3rd end is the output of described voltage detection module.
Preferably, described voltage detection module also has shunt capacitance, and one end of this shunt capacitance is connected with a tie point of described selection, other end ground connection.
Preferably, described time delay keeps module to comprise the discharge resistance and electric capacity that are connected in parallel, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, described time delay keeps the output of module to keep the input of module to be connected with described time delay.More preferably, replace described time delay and keep the output of module to keep the input of module to be connected with described time delay, the input of module and described time delay can also be kept to keep also being connected with charging resistor between the output of module in described time delay.
Preferably, described switch control module comprises a switch element, and the first end of described switch element is the input of described switch control module, and the second end is the output of described switch control module, the 3rd end ground connection.
Preferably, described voltage detection module comprises two first, second divider resistances be connected in series for dividing potential drop and a triode, one end of described first divider resistance is the first input end of described voltage detection module, the other end is connected with one end of described second divider resistance and the base stage of described triode, second input of the very described voltage detection module of transmitting of described triode, the output of the very described voltage detection module of current collection, the other end ground connection of described second divider resistance.Described time delay keeps module to comprise the discharge resistance and an electric capacity that are connected in parallel, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, described time delay keeps the output of module to keep the input of module to be connected with described time delay.Described switch control module comprises a power field effect transistor, and the grid of described power field effect transistor is the input of described switch control module, drains as the output of described switch control module, source ground.More preferably, described voltage detection module also has a shunt capacitance, and one end of this shunt capacitance is connected with the base stage of described triode, other end ground connection.In addition, described time delay can also be replaced and keep the output of module to keep the input of module to be connected with described time delay, the input of module and described time delay can also be kept to keep also being connected with charging resistor between the output of module in described time delay.
According to power supply short-circuit protective circuit of the present invention; when there is short circuit in the output of power circuit; whether the control IC no matter in power circuit possesses short-circuit protection function; reliably can both stop the output action of the control IC for carrying out pulse width modulation; significantly reduce the effective value of output current, realize the object of short-circuit protection.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the control IC self representing in the prior art can realize short-circuit protection.
Fig. 2 is the schematic diagram of the module representing power supply short-circuit protective circuit of the present invention
Fig. 3 is the circuit diagram of the concrete example representing power supply short-circuit protective circuit of the present invention.
Fig. 4 is the voltage of power end of the control IC represented under the power supply short-circuit protective circuit work shown in Fig. 3 and the oscillogram of the output current of circuit.
Embodiment
With reference to accompanying drawing, the execution mode of power supply short-circuit protective circuit 1 of the present invention is described in detail.Wherein, for convenience of explanation, identical Reference numeral is marked to identical element.
Fig. 2 is the schematic diagram of the module representing power supply short-circuit protective circuit 1 of the present invention.Power supply short-circuit protective circuit 1 comprises: voltage detection module 11, it has two inputs and an output, first input end is connected with the power end VCC of control IC, carry out the voltage of the power end VCC of detection control IC thus, the voltage of the power end VCC of this control IC is used to the voltage of the short-circuit state of the output reflecting power supply, second input is connected with the reference voltage terminal REF of control IC, compared by the voltage of the power end VCC to the control IC detected and the voltage of reference voltage terminal REF, the magnitude relationship of result judges signal from output output detections based on the comparison, time delay keeps module 12, and it has an input and an output, and input is connected with the output of voltage detection module 11, and time delay keeps module 12 to judge signal based on the detection from voltage detection module 11, from output output switching signal, switch control module 13, it has an input and an output, input and time delay keep the output of module 12 to be connected, output is connected with the output control terminal CS of the output pwm signal of control IC, based on the switching signal keeping module 12 from time delay, output control terminal CS to the output pwm signal of control IC exports control signal, output control terminal CS is the enable terminal that control IC exported/stopped output pwm signal, and time delay keeps module 12 to carry out via this switch control module 13 time that regulation control IC stops output pwm signal.In addition, voltage detection module 11, time delay keep module 12 and switch control module 13 all to have earth terminal.
Wherein, module 12 output detections is kept to judge that the mode of signal comprises the multiple modes can transmitting Detection Information such as output voltage to time delay, such as, comprise the mode exporting forward voltage, not output voltage and export reverse voltage, also comprising representing that the signal of Detection Information compares with the threshold value specified in advance, carrying out the mode exported according to the size of the signal representing Detection Information.In addition, the mode to switch control module 13 output switching signal also comprises above-mentioned multiple mode, as long as can realize making the state of control IC output pwm signal and making control IC stop the state of output pwm signal to switch.In the present embodiment, output detections judges that the mode of signal and output switching signal all adopts the mode of the voltage exporting high and low level.
When the output of power supply does not produce short circuit, the voltage of the power end VCC of control IC be normal operating voltage (such as, for 18.5V), now, the voltage of this power end VCC by the voltage after the dividing potential drop of voltage detection module 11 inside higher than reference voltage terminal REF(such as, for 5V) voltage, the detection of voltage detection module 11 output low level judges signal, time delay keeps module 12 to judge signal based on this low level detection, the switching signal of output low level, thus, switch control module 13 is based on this switching signal, output control terminal CS not to control IC exports control signal, guarantee control IC output pwm signal.On the other hand, when the output of power supply produces short circuit, the voltage drop of the power end VCC of control IC, although the voltage of power end VCC does not drop to the shutoff threshold voltage of control IC self, as long as but the voltage obtained after making the dividing potential drop of the voltage of power end VCC by voltage detection module 11 inside (such as, at below 4.4V) than reference voltage terminal REF voltage (such as, for 5V) magnitude of voltage of low regulation is (such as, for 0.6V), so, the detection that voltage detection module 11 exports high level judges signal, after this, time delay keeps module 12 to export the switching signal of high level, switch control module 13 is based on this high level switching signal, to the control signal of the output control terminal CS output low level of control IC, control IC stops output pwm signal.Therefore, output current can be made to drop to 0, realize the short-circuit protection of power output end.
After this, control IC stops the time of output pwm signal to keep module 12 to specify by time delay, realize after the above-mentioned time through keeping module 12 to specify by time delay, switch control module 13 stops the control signal of the output control terminal CS output low level to control IC, thus, make control IC output pwm signal again, output current rises again.When the output of power supply is still in short-circuit condition, voltage detection module 11 detects the voltage drop of the power end VCC of control IC again, by the control signal of switch control module 13 to the output control terminal CS output low level of control IC, to stop the output of control IC, if the output of power supply is in short-circuit condition always, then the output action of starting/closing control IC repeatedly, therefore, export batch (-type) electric current, to reduce the effective value of output current.Under the output of power supply recovers the normal i.e. settled situation of short trouble, power circuit reverts to normal operating state automatically.
Specifically, above-mentioned voltage detection module 11 is made up of a pair dividing potential drop resistance R3, a R4 and switch element, but be not limited thereto, also the change in voltage of the power end VCC of the control IC caused because of the short circuit of output can be detected by other element, such as, dividing potential drop resistance is not limited to only have a pair, can also arrange multiple resistance as required, switch element can utilize other the comparing element with equivalent function to replace, such as comparator etc.In the present embodiment, comparing element adopts the triode TR1 of positive-negative-positive, as shown in Figure 3, one end of resistance R3 is connected with the power end VCC of control IC (the A point in figure), its other end is connected with one end of resistance R4, the other end ground connection of resistance R4, and the intermediate point B of two resistance R3, R4 is connected with the base stage of triode TR1, the emitter of triode TR1 with in the reference voltage terminal REF(figure of control IC for C point) be connected, the collector electrode of triode TR1 is connected with the output of voltage detection module 11.Voltage detection module 11 can also be included in the shunt capacitance C1 connected between B point and ground GND, and this shunt capacitance C1 plays voltage detecting time delay to a certain degree.Prevent voltage detecting circuit misoperation.
In addition, above-mentioned switch control module 13 is made up of a switch element, in the present embodiment, adopts power field effect transistor TR2, but be not limited thereto, the combination etc. of other element or the element had with the function of power field effect transistor TR2 equivalence can also be adopted.In the present embodiment, as shown in Figure 3, the grid (being D point in figure) of power field effect transistor TR2 is connected with the input of switch control module 13, namely the output of module 12 is kept to be connected with time delay, the drain electrode of power field effect transistor TR2 is connected with the output control terminal CS of control IC (in figure for E point), the source ground of power field effect transistor TR2.
In addition, above-mentioned time delay keeps module 12 to comprise the discharge resistance R6 and electric capacity C2 that are connected in parallel, and electric capacity C2 keeps the output of module 12 to be connected with one end of discharge resistance R6 parallel connection with time delay, the other end ground connection that electric capacity C2 is in parallel with discharge resistance R6.In addition, preferably, this time delay keeps module 12 can also be connected a charging resistor R5 between input with output.In the present embodiment, as shown in Figure 3, one end of charging resistor R5 is connected with the collector electrode of triode TR1, the other end is connected with above-mentioned one end of electric capacity C2 and the grid of power field effect transistor TR2, utilizes the charge constant of this charging resistor R5 and electric capacity C2 to regulate the time of charging to electric capacity C2.In order to ensure the charging current of electric capacity C2, can be set to much smaller than discharge resistance R6 by the value of charging resistor R5, wherein, discharge resistance R6 is used for discharging to electric capacity C2.When time delay keeps module 12 not comprise charging resistor R5, this time delay keeps the input of module 12 to be connected with output, that is, above-mentioned one end of electric capacity C2 both kept the input of module 12 to be connected with time delay, kept the output of module 12 to be connected again with time delay.In the present embodiment, when time delay keeps module 12 not comprise charging resistor R5, above-mentioned one end of electric capacity C2 is connected with the grid of the collector electrode of triode TR1 and power field effect transistor TR2.
Below, with reference to Fig. 3, the course of action for power supply short-circuit protective circuit 1 is described.When the output of power supply produces short circuit, voltage detection module 11 detects the voltage drop of A point, and the voltage of the B point obtained by two resistance R3, R4 dividing potential drops is also declined.When B point voltage drop to than low below the 0.6V of the voltage of C point be the voltage of B point at below 4.4V time, triode TR1 conducting.Now, as the detection that voltage detection module 11 exports, the voltage of the 5V of C point judges that signal supply time delay keeps the input of module 12 via triode TR1.The voltage of this 5V charges to electric capacity C2 via charging resistor R5, when the voltage (being equivalent to the switching signal that time delay keeps module 12 to export) of the voltage at electric capacity C2 two ends and D point be promoted to higher than the power field effect transistor TR2 conducting included by switch control module 13 threshold voltage (such as, for 1V) time, power field effect transistor TR2 conducting, make the voltage drop of E point to low level (below 1V), therefore, the control signal of switch control module 13 output low level, control IC is made to stop output pwm signal, thus, the short-circuit protection of output can be realized.
After this, because control IC stops output pwm signal, control IC power consumption reduces, simultaneously, charged to smoothing capacity C3 via resistance R1 by the direct voltage obtained after the ac voltage rectifier of the interchange end from power supply, the voltage of the power end VCC of control IC rises again.Thereupon, the voltage of B point also rises thereupon, and when the voltage rise of B point is to more than 4.4V, triode TR1 becomes cut-off from conducting, and now, the voltage of D point is still higher than the on state threshold voltage of power field effect transistor TR2.After this, because triode TR1 ends, the voltage of the 5V provided by the reference voltage terminal of control IC can not supply electric capacity C2 via charging resistor R5, so electric capacity C2 is no longer charged, but start to discharge via discharge resistance R6, the voltage of D point starts to decline.When the voltage drop of D point is on state threshold voltage lower than power field effect transistor TR2, power field effect transistor TR2 also ends, and thus, the voltage of the output control terminal CS of control IC and the low level of E point are released, make control IC output pwm signal again, output current rises again.
In this case, as mentioned above, when the output of power supply is still in short-circuit condition, the voltage of B point declines again, make triode TR1 conducting again, after this, make power field effect transistor TR2 also conducting again, the voltage of the output control terminal CS of drop-down control IC, makes control IC stop exporting.Because the output of power supply is in short-circuit condition always, so the output action of above-mentioned starting/closing control IC proceeds, as shown in Figure 4, the voltage of the power end VCC of control IC is the wavy rising/decline repeatedly of sawtooth, and the output of power supply exports batch (-type) electric current with the cycle that the period of waves of the power end VCC with control IC is identical.Because batch (-type) electric current is only circulating instantaneously, so the effective value of output current entirety is very low.
At this, can by keeping the electric capacity C2 of module 12 and the parameter of discharge resistance R6 to regulate to formation time delay in advance, carry out the constant conduction time t1 of regulation power field effect transistor TR2, namely, prior regulation makes control IC continue to stop time of output pwm signal, thus can the effective value of batch (-type) electric current that exports when short circuit of allocated circuit.The size of the value of discharge resistance R6 or electric capacity C2 determines the length of constant conduction time t1, such as, when triode TR1 conducting, the voltage of D point is the voltage that about 5V(approximates the reference voltage terminal REF of control IC), if discharge resistance R6 is set to 1M Ω, electric capacity C2 is set to 1 μ F, then determining constant conduction time t1 is 98.4ms; When discharge resistance R6 is constant, if electric capacity C2 is set to 2 μ F, then determine constant conduction time t1 elongated to 160.8ms, that is, control IC continues to stop the time of output pwm signal elongated.Thus, reduce the effective value of the batch (-type) electric current that power supply exports when short circuit, play the protective effect when the output short circuit of power supply further.
In the present embodiment, power supply short-circuit protective circuit is detected by the voltage of the direct power end VCC to control IC, judges whether the output of power supply creates short circuit.Such as, but be not limited thereto, can also be detected by the voltage of the feedback end FB to control IC, the short circuit carrying out the output of power supply judges.In the present embodiment, receive reference voltage by the reference voltage terminal REF of control IC, but be not limited thereto, also can produce reference voltage by another way.In addition, in the present embodiment, when detecting that the output of power supply creates short circuit, being by the output control terminal CS of control IC is set to low level mode, making control IC stop output pwm signal, but being not limited thereto.
Above, embodiments of the present invention are illustrated.As mentioned above; when there is short circuit in the output of power circuit; when control IC in a power does not possess short-circuit protection function; according to power supply short-circuit protective circuit of the present invention; the output action of the control IC for carrying out pulse width modulation can be stopped; significantly reduce the effective value of output current, realize the object of short-circuit protection.In addition; in reasons such as the situations that leakage inductance is large or secondary short circuited output impedance is excessive or in multiple-output electric power, single output is shorted due to transformer; make the change of power output during short circuit can not reach the threshold value of elementary side overpower protection; even if so when the control IC possessing short-circuit protection function does not start above-mentioned short-circuit protection function; power supply short-circuit protective circuit of the present invention can be applied equally, reliably realize the object of short-circuit protection.
In addition, the present invention can carry out various execution mode and distortion under the prerequisite of the thought and scope that do not depart from broad sense of the present invention.In addition, above-mentioned execution mode for illustration of the present invention, but does not limit scope of the present invention.
Claims (8)
1. a power supply short-circuit protective circuit, it, when the output of the power supply with the control IC for output pulse width modulation signal produces short circuit, makes described control IC stop output pulse width modulation signal, it is characterized in that,
Comprise:
Voltage detection module, with detection, its first input end reflects that the terminal of the voltage of the short-circuit state of the output of power supply is connected, second input is connected with the terminal receiving reference voltage, the result that the voltage conditions associated based on the short circuit of the output to described reflection power supply and described reference voltage compare, signal is judged from output output detections
Time delay keeps module, and its input is connected with the output of described voltage detection module, judges signal based on described detection, from output output switching signal,
Switch control module, its input and described time delay keep the output of module to be connected, the control terminal that output exported/stopped output pulse width modulation signal with the described control IC of control is connected, according to the switching signal keeping module from described time delay, export from the output be connected with described control terminal and control the signal that described control IC exported/stopped output pulse width modulation signal;
Described time delay keeps module to judge signal based on described detection, described switching signal is exported to described switch control module, described switch control module is according to described switching signal, within the delay time being kept Module Specification by described time delay, described control IC is made to stop output pulse width modulation signal, further, after described delay time, described control IC output pulse width modulation signal is made.
2. power supply short-circuit protective circuit as claimed in claim 1, is characterized in that,
Described voltage detection module has:
The divider resistance that two or more is connected in series, the upstream extremity being positioned at the divider resistance of most upstream is the first input end of described voltage detection module, is positioned at the downstream ground connection of the divider resistance of most downstream,
To the comparing element that the voltage obtained by described divider resistance dividing potential drop and described reference voltage are compared, the tie point selected in more than one tie point between first end with the divider resistance be connected in series from described two or more is connected, second end is the second input of described voltage detection module, and the 3rd end is the output of described voltage detection module.
3. power supply short-circuit protective circuit as claimed in claim 2, is characterized in that,
Described voltage detection module also has shunt capacitance, and one end of this shunt capacitance is connected with a tie point of described selection, other end ground connection.
4. the power supply short-circuit protective circuit according to any one of claims 1 to 3, is characterized in that,
Described time delay keeps module to comprise the discharge resistance and electric capacity that are connected in parallel, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, described time delay keeps the output of module to keep the input of module to be connected with described time delay.
5. the power supply short-circuit protective circuit according to any one of claims 1 to 3, is characterized in that,
Described time delay keeps module to comprise the discharge resistance and electric capacity that are connected in parallel, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, keeps the input of module and described time delay to keep also being connected with charging resistor between the output of module in described time delay.
6. the power supply short-circuit protective circuit according to any one of claims 1 to 3, is characterized in that,
Described switch control module comprises a switch element, and the first end of described switch element is the input of described switch control module, and the second end is the output of described switch control module, the 3rd end ground connection.
7. power supply short-circuit protective circuit as claimed in claim 1, is characterized in that,
Described voltage detection module comprises two first, second divider resistances be connected in series for dividing potential drop and a triode, one end of described first divider resistance is the first input end of described voltage detection module, the other end is connected with one end of described second divider resistance and the base stage of described triode, second input of the very described voltage detection module of transmitting of described triode, the output of the very described voltage detection module of current collection, the other end ground connection of described second divider resistance
Described time delay keeps module to comprise the discharge resistance and an electric capacity that are connected in parallel, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, described time delay keeps the output of module to keep the input of module to be connected with described time delay
Described switch control module comprises a power field effect transistor, and the grid of described power field effect transistor is the input of described switch control module, drains as the output of described switch control module, source ground.
8. power supply short-circuit protective circuit as claimed in claim 1, is characterized in that,
Described voltage detection module two of comprising for dividing potential drop be connected in series first, second divider resistance, a triode and a shunt capacitance, one end of described first divider resistance is the first input end of described voltage detection module, the other end is connected with one end of described second divider resistance and the base stage of described triode, second input of the very described voltage detection module of transmitting of described triode, the output of the very described voltage detection module of current collection, the other end ground connection of described second divider resistance, one end of described shunt capacitance is connected with the base stage of described triode, other end ground connection,
Described time delay keeps module to comprise the discharge resistance be connected in parallel, a charging resistor and an electric capacity, first tie point of described discharge resistance and described electric capacity is the output that described time delay keeps module, second tie point ground connection of described discharge resistance and described electric capacity, the input of module and described time delay is kept to keep also being connected with described charging resistor between the output of module in described time delay
Described switch control module comprises a power field effect transistor, and the grid of described power field effect transistor is the input of described switch control module, drains as the output of described switch control module, source ground.
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| CN109510958A (en) * | 2018-11-30 | 2019-03-22 | 惠州华科电器有限公司 | Short-circuit protection circuit and short circuit protection system |
| CN110914643A (en) * | 2017-08-15 | 2020-03-24 | 罗伯特·博世有限公司 | Control device with a circuit for short-circuit protection of a ground line and a sensor, and method for short-circuit protection of a ground line and a sensor |
| CN110994559A (en) * | 2019-12-06 | 2020-04-10 | 郑州嘉晨电器有限公司 | Power module output end short-circuit protection circuit |
| CN111426932A (en) * | 2020-05-14 | 2020-07-17 | 深圳青铜剑技术有限公司 | Power semiconductor device driving power supply short circuit detection circuit |
| CN112018731A (en) * | 2020-07-08 | 2020-12-01 | 中车株洲电力机车研究所有限公司 | Monitoring method, device and system for rectifying and filtering device |
| CN112134257A (en) * | 2020-09-24 | 2020-12-25 | 深圳市信锐网科技术有限公司 | Short-circuit protection circuit of direct-current power supply |
| CN114597863A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN115940362A (en) * | 2023-02-08 | 2023-04-07 | 深圳市科宇电源科技有限公司 | Adaptive power supply circuit and adaptive adjusting method |
| CN119125962A (en) * | 2024-08-15 | 2024-12-13 | 山西高科华杰光电科技股份有限公司 | A circuit for detecting abnormality of LED module |
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| CN201813147U (en) * | 2010-10-09 | 2011-04-27 | Bcd半导体制造有限公司 | A short-circuit protection circuit for switching power supply |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110914643A (en) * | 2017-08-15 | 2020-03-24 | 罗伯特·博世有限公司 | Control device with a circuit for short-circuit protection of a ground line and a sensor, and method for short-circuit protection of a ground line and a sensor |
| US11506515B2 (en) | 2017-08-15 | 2022-11-22 | Robert Bosch Gmbh | Control unit comprising a circuit, and method for short-circuit protection of ground lines and sensors |
| CN109510958A (en) * | 2018-11-30 | 2019-03-22 | 惠州华科电器有限公司 | Short-circuit protection circuit and short circuit protection system |
| CN110994559B (en) * | 2019-12-06 | 2022-05-03 | 河南嘉晨智能控制股份有限公司 | Power module output end short-circuit protection circuit |
| CN110994559A (en) * | 2019-12-06 | 2020-04-10 | 郑州嘉晨电器有限公司 | Power module output end short-circuit protection circuit |
| CN111426932A (en) * | 2020-05-14 | 2020-07-17 | 深圳青铜剑技术有限公司 | Power semiconductor device driving power supply short circuit detection circuit |
| CN112018731A (en) * | 2020-07-08 | 2020-12-01 | 中车株洲电力机车研究所有限公司 | Monitoring method, device and system for rectifying and filtering device |
| CN112018731B (en) * | 2020-07-08 | 2022-08-16 | 中车株洲电力机车研究所有限公司 | Monitoring method, device and system for rectifying and filtering device |
| CN112134257A (en) * | 2020-09-24 | 2020-12-25 | 深圳市信锐网科技术有限公司 | Short-circuit protection circuit of direct-current power supply |
| CN114597863A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN114597863B (en) * | 2022-03-07 | 2024-02-20 | 潍柴动力股份有限公司 | Power protection circuit |
| CN115940362A (en) * | 2023-02-08 | 2023-04-07 | 深圳市科宇电源科技有限公司 | Adaptive power supply circuit and adaptive adjusting method |
| CN119125962A (en) * | 2024-08-15 | 2024-12-13 | 山西高科华杰光电科技股份有限公司 | A circuit for detecting abnormality of LED module |
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