CN106330147A - Inductor short circuit protection circuit and method - Google Patents
Inductor short circuit protection circuit and method Download PDFInfo
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Abstract
The invention provides an inductor short circuit protection circuit and method. The circuit comprises a power switch tube which is used for realizing inductor short circuit protection; a sampling resistor which is used for sampling an output current of the power switch tube; a voltage sampling module which is used for sampling a voltage change on the sampling resistor; a comparison module which is used for comparing the sampling voltage and a reference voltage; a triggering module which is used for generating a switch-off signal of the power switch tube when the sampling voltage is smaller than the reference voltage; and a switch control logic module which is used for determining a switch-on/switch-off time sequence of the power switch tube. According to the circuit and the method, the voltage difference between the power supply voltage VDD and the reference ground GND is detected, whether a controller enters an undervoltage locking state or an inductor short circuit protection state is judged according to undervoltage duration of the VDD relative to the GND, so an inductor short circuit protection mechanism is ensured to be triggered before the undervoltage locking state, the power switch tube M0 is switched off timely and reliably, the normal work of a circuit in which an inductor is located is ensured, and devices are prevented from being damaged by an inductor short circuit fault.
Description
Technical field
The present invention relates to IC design field, particularly relate to a kind of inductance short-circuit protection circuit and method.
Background technology
In Switching Power Supply designs, conventional device include NMOS tube, PMOS, diode, Schottky tube, resistance,
Inductance, electric capacity etc., wherein, inductance is conventional important energy storage device.The short trouble of inductance the most then reduces the inductance value of inductance,
Affect the normal work of system, current break uncontrollable damage system during heavy then dead short.Therefore for the short trouble of inductance,
It is necessary to ensure that protection mechanism can trigger before current break damage system in time when designing controller, and reliable turn-off MOS
Pipe.
Being illustrated in figure 1 the inductance short-circuit protection that traditional non-three port controllers realize, one end of inductance L0 connects afterflow two pole
The anode of pipe D0, the other end connect the outfan of LED string, the negative electrode of described sustained diode 0 and described LED
The input of string connects input voltage vin, and the two ends of described LED string are also associated with electric capacity of voltage regulation C0, described controller
SW end is connected between described sustained diode 0 with described inductance L0, CS end is connected sampling resistor Rcs, vdd terminal connects
Connect the top crown of electric capacity C1, the other end of described sampling resistor Rcs, the bottom crown of described electric capacity C1 and described controller
GND end connects with reference to ground.Described controller directly detects the voltage on described sampling resistor Rcs, when detecting by CS end
When on described sampling resistor Rcs, voltage exceedes Internal current limit threshold value Vref, comparator output switching activity, and pass through switch control logic
Module and driving module output drive signal drv turn off metal-oxide-semiconductor M0, realize inductance short-circuit protection with this.But, pass
The external-connected port of the non-three port controller inductance short-circuit protection circuits of system is many, and corresponding packaging cost is the highest.
In order to reduce cost, three port controllers arise at the historic moment, and are illustrated in figure 2 three port controllers of the prior art, institute
State three port controllers and use floating ground framework, do not have special CS end to detect the pressure drop on described sampling resistor Rcs.Work as inductance
Short circuit, when described metal-oxide-semiconductor M0 opens, big electric current flows through described sampling resistor Rcs, has raised described three port controllers
GND current potential, the pressure drop between power vd D and GND reduces, and easily triggers the under-voltage locking shape of described three port controllers
State, cause internal logic disorder cannot metal-oxide-semiconductor M0 described in reliable turn-off, current break to maximum will burn described MOS
Pipe M0 and described sampling resistor Rcs, seriously can cause aircraft bombing, cause unnecessary economic loss and security threat.
Therefore, the protection of inductance short circuit has become one of those skilled in the art's problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of inductance short-circuit protection circuit and method,
For solving the problems such as economic loss and security threat that in prior art, inductance short circuit causes.
For achieving the above object and other relevant purposes, the present invention provides a kind of inductance short-circuit protection circuit, and described inductance short circuit is protected
Protection circuit at least includes:
Power switch pipe, is connected in inductor loop, for being realized the protection of inductance short circuit by the shutoff of described power switch pipe；
Sampling resistor, is connected to the outfan of described power switch pipe, for adopting the output electric current of described power switch pipe
Sample；
Voltage sample module, is connected between described sampling resistor and supply voltage, for becoming the voltage on described sampling resistor
Change and sample；
Comparison module, connects described voltage sample module and a reference voltage, for sampled voltage is compared with described reference voltage,
And export comparative result；
Trigger module, connects described comparison module and a timing module, for when described sampled voltage is less than described reference voltage
Send the cut-off signals of described power switch pipe and described cut-off signals latched, after the timing time that described timing module sets
Described cut-off signals is unlocked；
Switch control logic module, is connected to described trigger module outfan, opens shutoff for determine described power switch pipe
Sequential, and then control the switch of described power switch pipe.
Preferably, also include the time delay module being connected to the outfan of described comparison module, when described sampled voltage is less than described ginseng
Examining time of voltage when exceeding setting delay time, trigger UVP signal, control circuit enters under-voltage locking state.
Preferably, described inductor loop includes: be connected to the LED module of input voltage, is connected to the output of described LED module
The inductance of end, the other end of described inductance connects the anode of fly-wheel diode, and the negative electrode of described fly-wheel diode connects described input
Voltage；The drain terminal of described power switch pipe is connected between described inductance and described fly-wheel diode.
Preferably, the reverse input end of described comparison module connects described sampled voltage, positive input connects described reference voltage.
Preferably, described trigger module is rest-set flip-flop, and the S end of described rest-set flip-flop is connected to the output of described comparison module
End, the R end of described rest-set flip-flop is connected to the outfan of described timing module.
It is highly preferred that the input of described timing module is connected to the outfan of described trigger module, from described cut-off signals onset
Start timing.
Preferably, one end that described sampling resistor is connected with described power switch pipe is as the reference of described inductance short-circuit protection circuit
Ground, the reference ground of the other end connection system of described sampling resistor, wherein, described inductance short-circuit protection circuit is with reference to the current potential on ground
Current potential higher than described system reference ground.
For achieving the above object and other relevant purposes, the present invention provides a kind of inductance short-circuit protection method, and described inductance short circuit is protected
Maintaining method at least includes:
When inductance short circuit, in inductor loop, electric current moment increases, the sample rate current moment in described inductance to the path with reference to ground
Increasing, the pressure reduction between sampled point and supply voltage diminishes, and the pressure reduction between described sampled point and described supply voltage is less than ginseng
Cut-off signals onset when examining voltage, described inductance is disconnected by described cut-off signals to the path with reference to ground, and then realizes inductance short circuit
Protection；Described cut-off signals is invalid after persistently setting timing time, and described inductor loop normally works.
Preferably, the pressure reduction between described sampled point and described supply voltage exceedes setting time delay less than the time of described reference voltage
Time then triggers UVP signal, and control circuit enters under-voltage locking state.
As it has been described above, the inductance short-circuit protection circuit of the present invention and method, have the advantages that
The inductance short-circuit protection circuit of the present invention and method by detect the supply voltage VDD of described inductance short-circuit protection circuit with
With reference to the pressure reduction between ground GND, judge that controller enters under-voltage locking according to the VDD under-voltage persistent period relative to GND
State or inductance short-circuit protection state.If of short duration VDD under-voltage burr occurs in setting delay time, trigger inductance short-circuit protection；
If VDD is under-voltage, the persistent period exceedes setting delay time, then controller enters under-voltage locking state.Thus ensure inductance short circuit
Protection mechanism triggers before under-voltage locking state, timely and reliably switch-off power switching tube M0, it is ensured that inductance place circuit is just
Often work, it is to avoid the inductance short trouble damage to device.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of non-three port controllers of the prior art.
Fig. 2 is shown as the structural representation of three port controllers of the prior art.
Fig. 3 is shown as the principle schematic of the inductance short-circuit protection circuit of the present invention.
Fig. 4 is shown as the signal waveform schematic diagram of the inductance short-circuit protection circuit of the present invention.
Element numbers explanation
1 inductance short-circuit protection circuit
11 voltage sample modules
12 comparison modules
13 trigger modules
14 timing modules
15 switch control logic modules
16 drive module
17 time delay modules
2 LED modules
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be by disclosed by this specification
Content understand other advantages and effect of the present invention easily.The present invention can also be added by the most different detailed description of the invention
To implement or application, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Various modification or change is carried out under god.
Refer to Fig. 3～Fig. 4.It should be noted that the diagram provided in the present embodiment illustrates the present invention's the most in a schematic way
Basic conception, the most graphic in component count time only display with relevant assembly in the present invention rather than is implemented according to reality, shape and
Size is drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout type
State is likely to increasingly complex.
As shown in Fig. 3～Fig. 4, the present invention provides a kind of inductance short-circuit protection circuit 1, and described inductance short-circuit protection circuit 1 includes:
Power switch pipe M0, sampling resistor Rcs, voltage sample module 11, comparison module 12, trigger module 13, timing mould
Block 14, switch control logic module 15, driving module 16 and time delay module 17.
As it is shown on figure 3, described power switch pipe M0 is connected in inductor loop, for by the shutoff of described power switch pipe
Realize the short-circuit protection of described inductance.
Specifically, in the present embodiment, described inductor loop includes: be connected to the LED module 2 of input voltage vin, connects
In the inductance L0 of described LED module 2 outfan, the other end of described inductance L0 is connected to the anode of sustained diode 0,
The negative electrode of described sustained diode 0 is connected to described input voltage vin, and the two ends of described LED module 2 are also associated with voltage stabilizing
Electric capacity C0.Described inductor loop can also be other the circuit including inductance, includes but are not limited to cited by the present embodiment
Inductor loop.The drain terminal of described power switch pipe M0 is connected between described inductance L0 and described sustained diode 0, at this
In embodiment, described power switch pipe M0 is NMOS tube, when the grid end of described power switch pipe M0 connects high level, institute
Stating power switch pipe M0 conducting, described inductance L0 is in charged state；When the grid end of described power switch pipe M0 connects low electricity
Flat, described power switch pipe M0 ends, and described inductance L0 is in discharge condition, does not has electric current to flow through described power switch pipe
M0 and described sampling resistor Rcs.
As it is shown on figure 3, described sampling resistor Rcs is connected to the source of described power switch pipe M0, for described power is opened
The output electric current closing pipe M0 is sampled.
Specifically, one end of described sampling resistor Rcs connects the source of described power switch pipe M0, other end connection system
With reference to ground VSS, the electric current flowing through described power switch pipe M0 can be sampled, and be converted into described power switch pipe M0
Source voltage terminal.
As it is shown on figure 3, described voltage sample module 11 is connected to source and the supply voltage VDD of described power switch pipe M0
Between, for the change in voltage of the source of described power switch pipe M0 is sampled.
Specifically, described voltage sample module 11 one end is connected to the source of described power switch pipe M0, the other end connects power supply
Voltage VDD.In the present embodiment, the voltage that described supply voltage VDD provides for outside, store electric energy by electric capacity C1,
The reference ground VSS of the other end connection system of described electric capacity C1.In the present embodiment, described voltage sample module 11 includes string
First resistance R1 of connection and the second resistance R2, described first resistance R1 and described second resistance R2 are to supply voltage VDD
With the voltage between described power switch pipe M0 source carries out dividing potential drop, obtain sampled voltage.
As it is shown on figure 3, described comparison module 12 is connected to described voltage sample module 11 and a reference voltage Vref, being used for will
Sampled voltage compares with described reference voltage Vref, and exports comparative result aocp.
Specifically, in the present embodiment, described comparison module 12 is a comparator, including positive input and reverse input end,
The reverse input end of described comparison module 12 connects described sampled voltage, positive input connects described reference voltage Vref, if institute
State sampled voltage more than described reference voltage Vref, the most described comparison module 12 output low level；If described sampled voltage is less than institute
Stating reference voltage Vref, the most described comparison module 12 exports high level.Connected mode cited by the present embodiment is only a kind of special case,
Those skilled in the art can use different connected modes according to different logical relations, is not limited with the present embodiment.
As it is shown on figure 3, described trigger module 13 is connected to described comparison module 12 and a timing module 14, for adopting described
The cut-off signals latch of described power switch pipe M0 is sent and by described cut-off signals latch when sample voltage is less than described reference voltage
Latch, after the timing time that described timing module 14 sets, described cut-off signals latch is unlocked.
Specifically, in the present embodiment, described trigger module 13 is a rest-set flip-flop, and the S end of described rest-set flip-flop connects
The outfan of described comparison module 12, the R end of described rest-set flip-flop connects the outfan of described timing module 14.When described
When the R end input of rest-set flip-flop is for high level, described rest-set flip-flop is output as low level；S end when described rest-set flip-flop
When the R end input that input is high level and described rest-set flip-flop is for low level, described rest-set flip-flop is output as high level；Work as institute
When stating the S end input of rest-set flip-flop for low level, the output of described rest-set flip-flop keeps previous state.Described timing module
The input of 14 connects the outfan of described trigger module 13, exports described cut-off signals latch from described trigger module 13 and opens
Beginning timing, in the present embodiment, when described cut-off signals latch is high level effectively, the most described timing module 14 receives institute
The high level stating trigger module 13 output starts timing, and timing time can be according to actual application settings, in the present embodiment, sets
Timing time is t1, sends high level signal after timing terminates, and the latch mode of described trigger module 13 is eliminated, described merit
Rate switching tube M0 normally works.
As it is shown on figure 3, described switch control logic module 15 is connected to described trigger module 13 outfan, it is used for determining described
Power switch pipe M0 opens shutoff sequential, and then controls the switch of described power switch pipe M0.
Specifically, described switch control logic module 15 receives described cut-off signals latch, due to described power switch pipe M0
Grid termination receive low level signal after, described power switch pipe M0 can turn off, therefore, described switch control logic module 15
Described cut-off signals latch (high level) will be received and be converted to low level signal.If described cut-off signals latch is high level,
The most described switch control logic module 15 still output low level, does not does reverse process to described cut-off signals latch.
As it is shown on figure 3, described driving module 16 is connected to described switch control logic module 15, drive described power switch pipe
M0。
Specifically, the input of described driving module 16 connects the outfan of described switch control logic module 15, described driving
The outfan of module 16 connects the grid end of described power switch pipe M0, the signal warp of described switch control logic module 15 output
For driving signal drv after crossing described driving module 16, the level of described driving signal drv and described switch control logic module 15
The signal of output is consistent, and driving force improves.
As it is shown on figure 3, described time delay module 17 is connected to the outfan of described comparison module 12, when described sampled voltage is less than
When the time of described reference voltage Vref exceedes setting delay time, triggering UVP signal, control circuit enters under-voltage locking
State.
Specifically, described time delay module 17 sets delay time, in the present embodiment, the described delay time that sets as t2,
If the time that described comparative result aocp is high level exceedes described setting delay time t2, then trigger UVP signal uvlo,
Enter under-voltage locking state；If the time that described comparative result aocp is high level not less than described setting delay time t2, then touches
Generating sense short-circuit protection, turns off described power switch pipe M0.
In the present embodiment, described electric capacity C1 and described sampling resistor Rcs is off-chip device, described sampling resistor Rcs and institute
State the source of power switch pipe M0 and one end that described first resistance R1 is connected is as reference of chip internal, the most described electricity
The reference ground GND of sense short-circuit protection circuit.
The guard method of the inductance short-circuit protection circuit of the present invention is as follows:
When inductance L0 short circuit, in inductor loop, electric current moment increases, and described inductance L0 is to reference to ground (GND or VSS)
Path in sample rate current moment increase, sampled point (input of described sampling resistor Rcs) and supply voltage VDD's
Pressure reduction diminishes, the then cut-off signals latch when the pressure reduction of described sampled point and described supply voltage VDD is less than a reference voltage Vref
Onset, described inductance L0 is disconnected to the path with reference to ground, and then realizes the protection of inductance short circuit by described cut-off signals latch,
Described cut-off signals latch is invalid after persistently setting timing time t1, and described inductor loop normally works.
When the pressure reduction of described sampled point and described supply voltage VDD exceedes setting time delay less than the time of described reference voltage Vref
Between t2 then trigger UVP signal uvlo, control circuit enters under-voltage locking state.
Specifically, as it is shown on figure 3, after short trouble occurs in described inductance L0, described power switch pipe M0 once opens,
Flow through described power switch pipe M0, described sampling resistor Rcs electric current by abrupt transients to maximum, described sampling resistor Rcs
On pressure drop will increase moment.As shown in Figure 4, due to reference ground GND and the described sampling of described inductance short-circuit protection circuit
Resistance Rcs is connected, and the current potential of the reference ground GND of described inductance short-circuit protection circuit is elevated, the most described supply voltage VDD
Current potential relative to the reference ground GND of described inductance short-circuit protection circuit reduces.
As shown in Fig. 3～Fig. 4, in the present embodiment, described sampling resistor R0, R1 sample VDD current potential, with this to described
The pressure reduction of sampled point and described supply voltage VDD is sampled, and compares with described reference voltage Vref.The t0 moment, described
Level after supply voltage VDD dividing potential drop is less than described reference voltage Vref, the comparative result aocp of described comparison module 12 output
Upset is high level, exports the cut-off signals latch of high level through described trigger module 13 and locks.The cut-off signals of high level
Latch is through described switch control logic module 15 output low level signal, and produces driving signal drv by described driving module 16,
Power switch pipe M0 described in the low level control of described driving signal drv turns off.Described power switch pipe M0 closes and has no progeny, without electricity
Stream flows through described sampling resistor Rcs, and the current potential of the reference ground GND of described inductance short-circuit protection circuit reduces.
The most described supply voltage VDD current potential relative to the reference ground GND of described inductance short-circuit protection circuit recovers, described
Comparative result aocp is low level by high level upset.Due to the locking of described trigger module 13, described cut-off signals latch is still
Old holding high level, the most described power switch pipe M0 persistently turns off.As shown in Figure 4, it is high as described cut-off signals latch
During level, described timing module 14 starts timing, and after the lasting t1 of timing time, output signal reset is high level pulse signal,
Unlocking rest-set flip-flop, described cut-off signals latch lost efficacy (low level), and the switching function of described power switch pipe M0 recovers,
I.e. current constant control.
As shown in Figure 4, if after described comparative result aocp turns over as high level, the persistent period exceedes in described time delay module 17
Setting delay time t2, the most described UVP signal uvlo upset is high level, i.e. enters under-voltage locking state, and system is by multiple
Position re-powers.If described comparative result aocp reverts to low level in described setting delay time t2, the most described under-voltage guarantor
Protect signal uvlo and maintain low level, be i.e. in non-under-voltage locking state, system worked well, only trigger short-circuit protection mechanism, close
Disconnected described power switch pipe M0.
The inductance short-circuit protection circuit of the present invention and method by detect the supply voltage VDD of described inductance short-circuit protection circuit with
With reference to the pressure reduction between ground GND, judge that controller enters under-voltage locking according to the VDD under-voltage persistent period relative to GND
State or inductance short-circuit protection state.If of short duration VDD under-voltage burr occurs in setting delay time, trigger inductance short-circuit protection；
If VDD is under-voltage, the persistent period exceedes setting delay time, then controller enters under-voltage locking state.Thus ensure inductance short circuit
Protection mechanism triggers before under-voltage locking state, timely and reliably switch-off power switching tube M0, it is ensured that inductance place circuit is just
Often work, it is to avoid the inductance short trouble damage to device.
In sum, the present invention provides a kind of inductance short-circuit protection circuit, and described inductance short-circuit protection circuit at least includes: be used for
Realize the power switch pipe of inductance short-circuit protection；For described power switch pipe is exported the sampling resistor that electric current is sampled；
For the voltage sample module that the change in voltage on described sampling resistor is sampled；For by sampled voltage and described reference electricity
Pressure ratio relatively, and exports the comparison module of comparative result；For sending described merit when described sampled voltage is less than described reference voltage
The cut-off signals of rate switching tube also latches, the trigger module unlocked by described cut-off signals after the timing time that timing module sets；
Open shutoff sequential for determine described power switch pipe, and then control the switch control logic of the switch of described power switch pipe
Module.The inductance short-circuit protection circuit of the present invention and method are by detecting the supply voltage VDD of described inductance short-circuit protection circuit
And with reference to the pressure reduction between ground GND, judge that controller enters under-voltage lock according to the VDD under-voltage persistent period relative to GND
Determine state or inductance short-circuit protection state.If of short duration VDD under-voltage burr occurs in setting delay time, trigger inductance short circuit and protect
Protect；If VDD is under-voltage, the persistent period exceedes setting delay time, then controller enters under-voltage locking state.Thus ensure inductance
Short-circuit protection mechanism triggers before under-voltage locking state, timely and reliably switch-off power switching tube M0, it is ensured that inductance place circuit
Normal work, it is to avoid the damage to device of the inductance short trouble.So, the present invention effectively overcomes of the prior art all
Shortcoming and have high industrial utilization.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any it is familiar with this skill
Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage of art.Therefore, such as
All that in art, tool usually intellectual is completed under without departing from disclosed spirit and technological thought etc.
Effect is modified or changes, and must be contained by the claim of the present invention.
Claims (9)
1. an inductance short-circuit protection circuit, it is characterised in that described inductance short-circuit protection circuit at least includes:
Power switch pipe, is connected in inductor loop, for being realized the guarantor of inductance short circuit by the shutoff of described power switch pipe
Protect；
Sampling resistor, is connected to the outfan of described power switch pipe, for carrying out the output electric current of described power switch pipe
Sampling；
Voltage sample module, is connected between described sampling resistor and supply voltage, for the voltage on described sampling resistor
Change is sampled；
Comparison module, connects described voltage sample module and a reference voltage, for by sampled voltage and described reference voltage ratio
Relatively, and export comparative result；
Trigger module, connects described comparison module and a timing module, for being less than described reference voltage at described sampled voltage
Time send the cut-off signals of described power switch pipe and described cut-off signals latched, when the timing that described timing module sets
After between, described cut-off signals is unlocked；
Switch control logic module, is connected to described trigger module outfan, opens pass for determine described power switch pipe
Disconnected sequential, and then control the switch of described power switch pipe.
Inductance short-circuit protection circuit the most according to claim 1, it is characterised in that: also include being connected to the defeated of described comparison module
Go out the time delay module of end, when described sampled voltage exceedes setting delay time less than the time of described reference voltage, trigger and owe
Pressure protection signal, control circuit enters under-voltage locking state.
Inductance short-circuit protection circuit the most according to claim 1, it is characterised in that: described inductor loop includes: be connected to input
The LED module of voltage, is connected to the inductance of described LED module outfan, and the other end of described inductance connects afterflow two pole
The anode of pipe, the negative electrode of described fly-wheel diode connects described input voltage；The drain terminal of described power switch pipe is connected to described
Between inductance and described fly-wheel diode.
Inductance short-circuit protection circuit the most according to claim 1, it is characterised in that: the reverse input end of described comparison module connects
Described sampled voltage, positive input connect described reference voltage.
Inductance short-circuit protection circuit the most according to claim 1, it is characterised in that: described trigger module is rest-set flip-flop, institute
The S end stating rest-set flip-flop is connected to the outfan of described comparison module, and the R end of described rest-set flip-flop is connected to described meter
Time module outfan.
Inductance short-circuit protection circuit the most according to claim 1 or 5, it is characterised in that: the input of described timing module connects
In the outfan of described trigger module, start timing from described cut-off signals onset.
Inductance short-circuit protection circuit the most according to claim 1, it is characterised in that: described sampling resistor and described power switch pipe
The one end being connected is as the reference ground of described inductance short-circuit protection circuit, the reference of the other end connection system of described sampling resistor
Ground, wherein, the current potential on described inductance short-circuit protection circuit reference ground is higher than the current potential on described system reference ground.
8. an inductance short-circuit protection method, it is characterised in that described inductance short-circuit protection method at least includes:
When inductance short circuit, in inductor loop, electric current moment increases, the sample rate current wink in described inductance to the path with reference to ground
Between increase, the pressure reduction between sampled point and supply voltage diminishes, and the pressure reduction between described sampled point and described supply voltage is little
Cut-off signals onset when reference voltage, described inductance is disconnected to the path with reference to ground, and then realizes electricity by described cut-off signals
The protection of sense short circuit；Described cut-off signals is invalid after persistently setting timing time, and described inductor loop normally works.
Inductance short-circuit protection method the most according to claim 8, it is characterised in that: between described sampled point and described supply voltage
Pressure reduction exceed setting delay time less than time of described reference voltage and then trigger UVP signal, control circuit enters owes
Pressure lock-out state.
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| CN201510373858.7A CN106330147B (en) | 2015-06-30 | 2015-06-30 | Inductance short-circuit protection circuit and method |
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| CN201510373858.7A CN106330147B (en) | 2015-06-30 | 2015-06-30 | Inductance short-circuit protection circuit and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365739A (en) * | 2018-03-14 | 2018-08-03 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching power circuit |
| CN109217259A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
| CN109638785A (en) * | 2019-01-31 | 2019-04-16 | 杭州士兰微电子股份有限公司 | Control circuit, Switching Power Supply and its control method of Switching Power Supply |
| CN109856435A (en) * | 2019-01-11 | 2019-06-07 | 深圳赛意法微电子有限公司 | The high pressure monitoring and protecting device of state latching circuit and the application circuit |
| CN110191546A (en) * | 2019-06-27 | 2019-08-30 | 上海新进芯微电子有限公司 | A kind of LED short-circuit protection circuit and light emitting device |
| CN110601533A (en) * | 2019-09-19 | 2019-12-20 | 厦门市必易微电子技术有限公司 | Control chip, control circuit, power supply circuit and control method |
| CN111212504A (en) * | 2020-03-27 | 2020-05-29 | 杰华特微电子（杭州）有限公司 | BIFRED converter, control method thereof and LED drive circuit applying BIFRED converter |
| CN111384704A (en) * | 2018-12-27 | 2020-07-07 | 沈阳新松机器人自动化股份有限公司 | Load short circuit self-locking protection circuit |
| CN111391611A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| WO2022159298A1 (en) * | 2021-01-20 | 2022-07-28 | Cirrus Logic International Semiconductor Ltd. | Short detection for inductive switching converters |
| US11837956B2 (en) | 2021-01-20 | 2023-12-05 | Cirrus Logic Inc. | Short detection for inductive switching converters |
| CN118412824A (en) * | 2024-07-02 | 2024-07-30 | 钰泰半导体股份有限公司 | Switch power supply output short-circuit protection circuit |
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| CN104349532A (en) * | 2013-07-26 | 2015-02-11 | 杭州必易科技有限公司 | LED (Light-Emitting Diode) constant-current driver and LED constant-current driving method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365739A (en) * | 2018-03-14 | 2018-08-03 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching power circuit |
| CN109217259A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
| CN111384704A (en) * | 2018-12-27 | 2020-07-07 | 沈阳新松机器人自动化股份有限公司 | Load short circuit self-locking protection circuit |
| CN109856435A (en) * | 2019-01-11 | 2019-06-07 | 深圳赛意法微电子有限公司 | The high pressure monitoring and protecting device of state latching circuit and the application circuit |
| CN109638785A (en) * | 2019-01-31 | 2019-04-16 | 杭州士兰微电子股份有限公司 | Control circuit, Switching Power Supply and its control method of Switching Power Supply |
| CN110191546A (en) * | 2019-06-27 | 2019-08-30 | 上海新进芯微电子有限公司 | A kind of LED short-circuit protection circuit and light emitting device |
| CN110601533A (en) * | 2019-09-19 | 2019-12-20 | 厦门市必易微电子技术有限公司 | Control chip, control circuit, power supply circuit and control method |
| CN111391611A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| CN111212504A (en) * | 2020-03-27 | 2020-05-29 | 杰华特微电子（杭州）有限公司 | BIFRED converter, control method thereof and LED drive circuit applying BIFRED converter |
| CN111212504B (en) * | 2020-03-27 | 2023-10-27 | 杰华特微电子股份有限公司 | BIFRED converter, control method thereof and LED driving circuit applying BIFRED converter |
| WO2022159298A1 (en) * | 2021-01-20 | 2022-07-28 | Cirrus Logic International Semiconductor Ltd. | Short detection for inductive switching converters |
| US11837956B2 (en) | 2021-01-20 | 2023-12-05 | Cirrus Logic Inc. | Short detection for inductive switching converters |
| CN118412824A (en) * | 2024-07-02 | 2024-07-30 | 钰泰半导体股份有限公司 | Switch power supply output short-circuit protection circuit |
| CN118412824B (en) * | 2024-07-02 | 2024-09-17 | 钰泰半导体股份有限公司 | Switch power supply output short-circuit protection circuit |
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