CN204681329U - A kind of inductance short-circuit protection circuit - Google Patents
A kind of inductance short-circuit protection circuit Download PDFInfo
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- CN204681329U CN204681329U CN201520460187.3U CN201520460187U CN204681329U CN 204681329 U CN204681329 U CN 204681329U CN 201520460187 U CN201520460187 U CN 201520460187U CN 204681329 U CN204681329 U CN 204681329U
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- 230000002459 sustained effect Effects 0.000 description 6
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Abstract
The utility model provides a kind of inductance short-circuit protection circuit, comprising: for realizing the power switch pipe of inductance short-circuit protection; For the sampling resistor of sampling to the output current of power switch pipe; For the voltage sample module of sampling to the change in voltage on sampling resistor; For the comparison module that sampled voltage is compared with reference voltage; For sending the trigger module of the cut-off signals of power switch pipe when sampled voltage is less than reference voltage; For determining the switch control logic module opening shutoff sequential of power switch pipe.The utility model is by detecting the pressure reduction between supply voltage VDD and reference ground GND; judge that controller enters under-voltage locking state or inductance short-circuit protection state according to VDD relative to the under-voltage duration of GND; thus ensure that inductance short-circuit protection mechanism triggers before under-voltage locking state; timely reliably switch-off power switching tube M0; guarantee the normal work of inductance place circuit, avoid inductance short trouble to the damage of device.
Description
Technical field
The utility model relates to integrated circuit (IC) design field, particularly relates to a kind of inductance short-circuit protection circuit.
Background technology
In Switching Power Supply design, conventional device comprises NMOS tube, PMOS, diode, Schottky tube, resistance, inductance, electric capacity etc., and wherein, inductance is conventional important energy storage device.The short trouble of inductance gently then reduces the inductance value of inductance, the normal work of influential system, current break uncontrollable damage system during heavy then dead short circuit.Therefore for the short trouble of inductance, need when CONTROLLER DESIGN to guarantee that protection mechanism can trigger in time before current break damage system, and reliable turn-off metal-oxide-semiconductor.
Be illustrated in figure 1 the inductance short-circuit protection that traditional non-three port controllers realize, one end of inductance L 0 connects the anode of sustained diode 0, the other end connects the output of LED string, the negative electrode of described sustained diode 0 and the input of described LED string connect input voltage vin, the two ends of described LED string are also connected with electric capacity of voltage regulation C0, the SW end of described controller is connected between described sustained diode 0 and described inductance L 0, CS end connects sampling resistor Rcs, vdd terminal connects the top crown of electric capacity C1, the other end of described sampling resistor Rcs, the bottom crown of described electric capacity C1 and the GND end of described controller connect with reference to ground.Described controller holds the voltage on sampling resistor Rcs described in direct-detection by CS; when detecting that on described sampling resistor Rcs, voltage exceedes Internal current limit threshold value Vref; comparator output switching activity; and turn off metal-oxide-semiconductor M0 by switch control logic module and driver module output drive signal drv, realize inductance short-circuit protection with this.But the external-connected port of traditional non-three port controller inductance short-circuit protection circuits is many, corresponding packaging cost is just high.
In order to reduce costs, three port controllers arise at the historic moment, and are illustrated in figure 2 three port controllers of the prior art, and described three port controllers adopt floating ground framework, do not have the pressure drop on the special described sampling resistor Rcs of CS end detection.When inductance short circuit, when described metal-oxide-semiconductor M0 opens, big current flows through described sampling resistor Rcs, raised the GND current potential of described three port controllers, the pressure drop between power vd D and GND reduces, and easily triggers the under-voltage locking state of described three port controllers, cause internal logic disorder cannot metal-oxide-semiconductor M0 described in reliable turn-off, current break to maximum will burn described metal-oxide-semiconductor 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.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of inductance short-circuit protection circuit, for solving the problem such as economic loss and security threat that in prior art, inductance short circuit causes.
For achieving the above object and other relevant objects, the utility model provides a kind of inductance short-circuit protection circuit, and described inductance short-circuit protection circuit at least comprises:
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 output of described power switch pipe, for sampling to the output current of described power switch pipe;
Voltage sample module, is connected between described sampling resistor and supply voltage, for sampling to the change in voltage on described sampling resistor;
Comparison module, connects described voltage sample module and a reference voltage, for being compared with described reference voltage by sampled voltage, and exports comparative result;
Trigger module, connect described comparison module and a timing module, for sending the cut-off signals of described power switch pipe when described sampled voltage is less than described reference voltage and described cut-off signals being 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 output, opens shutoff sequential, and then control the switch of described power switch pipe for what determine described power switch pipe.
Preferably, also comprise the time delay module of the output being connected to described comparison module, when the time that described sampled voltage is less than described reference voltage exceedes setting delay time, trigger under-voltage protection signal, control circuit enters under-voltage locking state.
Preferably, described inductor loop comprises: the LED module being connected to input voltage, is connected to the inductance of described LED module output, and 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, and the R end of described rest-set flip-flop is connected to the output of described timing module.
More preferably, the input of described timing module is connected to the output of described trigger module, timing from described cut-off signals onset.
Preferably; one end that described sampling resistor is connected with described power switch pipe is as the reference ground of described inductance short-circuit protection circuit; the reference ground of the other end connected system of described sampling resistor, wherein, described inductance short-circuit protection circuit with reference to the current potential on ground higher than the current potential on described system reference ground.
As mentioned above, inductance short-circuit protection circuit of the present utility model, has following beneficial effect:
Relative to the under-voltage duration of GND, inductance short-circuit protection circuit of the present utility model, by detecting the pressure reduction between the supply voltage VDD of described inductance short-circuit protection circuit and reference ground GND, judges that controller enters under-voltage locking state or inductance short-circuit protection state according to VDD.If there is the under-voltage burr of of short duration VDD in setting delay time, trigger inductance short-circuit protection; If VDD is under-voltage, the duration exceedes setting delay time, then controller enters under-voltage locking state.Thus ensureing that inductance short-circuit protection mechanism triggers before under-voltage locking state, reliably switch-off power switching tube M0 in time, guarantees the normal work of inductance place circuit, avoids inductance short trouble to the damage of 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 inductance short-circuit protection circuit of the present utility model.
Fig. 4 is shown as the signal waveform schematic diagram of inductance short-circuit protection circuit of the present utility model.
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 driver modules
17 time delay modules
2 LED modules
Embodiment
Below by way of specific instantiation, execution mode of the present utility model is described, those skilled in the art the content disclosed by this specification can understand other advantages of the present utility model and effect easily.The utility model can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present utility model.
Refer to Fig. 3 ~ Fig. 4.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present utility model in a schematic way, then only the assembly relevant with the utility model is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Fig. 3 ~ Fig. 4, the utility model provides a kind of inductance short-circuit protection circuit 1, and described inductance short-circuit protection circuit 1 comprises:
Power switch pipe M0, sampling resistor Rcs, voltage sample module 11, comparison module 12, trigger module 13, timing module 14, switch control logic module 15, driver module 16 and time delay module 17.
As shown in Figure 3, described power switch pipe M0 is connected in inductor loop, for being realized the short-circuit protection of described inductance by the shutoff of described power switch pipe.
Particularly, in the present embodiment, described inductor loop comprises: the LED module 2 being connected to input voltage vin, be connected to the inductance L 0 of described LED module 2 output, the other end of described inductance L 0 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 connected with electric capacity of voltage regulation C0.Described inductor loop also can be other the circuit comprising inductance, includes but are not limited to the inductor loop cited by the present embodiment.The drain terminal of described power switch pipe M0 is connected between described inductance L 0 and described sustained diode 0, in the present embodiment, described power switch pipe M0 is NMOS tube, when the grid end of described power switch pipe M0 connects high level, described power switch pipe M0 conducting, described inductance L 0 is in charged state; When the grid end of described power switch pipe M0 connects low level, described power switch pipe M0 ends, and described inductance L 0 is in discharge condition, does not have electric current to flow through described power switch pipe M0 and described sampling resistor Rcs.
As shown in Figure 3, described sampling resistor Rcs is connected to the source of described power switch pipe M0, for sampling to the output current of described power switch pipe M0.
Particularly, one end of described sampling resistor Rcs connects the reference ground VSS of the source of described power switch pipe M0, other end connected system, can sample, and be converted into the source voltage terminal of described power switch pipe M0 to the electric current flowing through described power switch pipe M0.
As shown in Figure 3, between the source that described voltage sample module 11 is connected to described power switch pipe M0 and supply voltage VDD, the change in voltage for the source to described power switch pipe M0 is sampled.
Particularly, described voltage sample module 11 one end is connected to source, the other end connection supply voltage VDD of described power switch pipe M0.In the present embodiment, the voltage that described supply voltage VDD provides for outside, by electric capacity C1 store electrical energy, the reference ground VSS of the other end connected system of described electric capacity C1.In the present embodiment, described voltage sample module 11 comprises the first resistance R1 and the second resistance R2 of series connection, described first resistance R1 and described second resistance R2 carries out dividing potential drop to the voltage between supply voltage VDD and described power switch pipe M0 source, obtains sampled voltage.
As shown in Figure 3, described comparison module 12 is connected to described voltage sample module 11 and a reference voltage Vref, for being compared with described reference voltage Vref by sampled voltage, and exports comparative result aocp.
Particularly, in the present embodiment, described comparison module 12 is a comparator, comprise 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 described sampled voltage is greater than described reference voltage Vref, then described comparison module 12 output low level; If described sampled voltage is less than described reference voltage Vref, then described comparison module 12 exports high level.Connected mode cited by the present embodiment is only a kind of special case, and those skilled in the art can adopt different connected modes according to different logical relations, is not limited with the present embodiment.
As shown in Figure 3, described trigger module 13 is connected to described comparison module 12 and a timing module 14, for sending the cut-off signals latch of described power switch pipe M0 when described sampled voltage is less than described reference voltage and described cut-off signals latch being latched, after the timing time that described timing module 14 sets, described cut-off signals latch is unlocked.
Particularly, 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 output of described comparison module 12, and the R end of described rest-set flip-flop connects the output of described timing module 14.When the R end of described rest-set flip-flop is input as high level, described rest-set flip-flop exports as low level; When the S end of described rest-set flip-flop is input as high level and the R of described rest-set flip-flop end is input as low level, described rest-set flip-flop exports as high level; When the S end of described rest-set flip-flop is input as low level, the output of described rest-set flip-flop keeps previous state.The input of described timing module 14 connects the output of described trigger module 13, timing from described trigger module 13 exports described cut-off signals latch, in the present embodiment, it is effective when described cut-off signals latch is high level, then described timing module 14 receive described trigger module 13 export high level start timing, timing time can set according to practical application, in the present embodiment, setting timing time is t1, high level signal is sent after timing terminates, the latch mode of described trigger module 13 is eliminated, and described power switch pipe M0 normally works.
As shown in Figure 3, described switch control logic module 15 is connected to described trigger module 13 output, for determining that described power switch pipe M0's opens shutoff sequential, and then controls the switch of described power switch pipe M0.
Particularly, described switch control logic module 15 receives described cut-off signals latch, after the grid termination of described power switch pipe M0 receives low level signal, described power switch pipe M0 can turn off, therefore, described switch control logic module 15 will receive described cut-off signals latch (high level) and be converted to low level signal.If described cut-off signals latch is high level, then described switch control logic module 15 still output low level, does not do reverse process to described cut-off signals latch.
As shown in Figure 3, described driver module 16 is connected to described switch control logic module 15, drives described power switch pipe M0.
Particularly, the input of described driver module 16 connects the output of described switch control logic module 15, the output of described driver module 16 connects the grid end of described power switch pipe M0, the signal that described switch control logic module 15 exports is drive singal drv after described driver module 16, the level of described drive singal drv is consistent with the signal that described switch control logic module 15 exports, and driving force improves.
As shown in Figure 3, described time delay module 17 is connected to the output of described comparison module 12, and when the time that described sampled voltage is less than described reference voltage Vref exceedes setting delay time, trigger under-voltage protection signal, control circuit enters under-voltage locking state.
Particularly, delay time is set in described time delay module 17, in the present embodiment, described setting delay time is t2, if the time that described comparative result aocp is high level exceedes described setting delay time t2, then trigger under-voltage protection signal uvlo, enter under-voltage locking state; If the time that described comparative result aocp is high level does not exceed described setting delay time t2, then trigger inductance short-circuit protection, described power switch pipe M0 is turned off.
In the present embodiment; described electric capacity C1 and described sampling resistor Rcs is the outer device of sheet; one end that described sampling resistor Rcs is connected with source and the described first resistance R1 of described power switch pipe M0 as the reference ground of chip internal, i.e. reference the ground GND of described inductance short-circuit protection circuit.
The operation principle of inductance short-circuit protection circuit of the present utility model is as follows:
When inductance L 0 short circuit, in inductor loop, electric current increases instantaneously, described inductance L 0 increases instantaneously to the sample rate current in the path with reference to ground (GND or VSS), sampled point (input of described sampling resistor Rcs) diminishes with the pressure reduction of supply voltage VDD, the then cut-off signals latch onset when the pressure reduction of described sampled point and described supply voltage VDD is less than a reference voltage Vref, described inductance L 0 disconnects to the path with reference to ground by described cut-off signals latch, and then realize the protection of inductance short circuit, described cut-off signals latch is invalid after continuing setting timing time t1, described inductor loop normally works.
The time that the pressure reduction of described sampled point and described supply voltage VDD is less than described reference voltage Vref exceedes and sets delay time t2 and then trigger under-voltage protection signal uvlo, and control circuit enters under-voltage locking state.
Particularly, as shown in Figure 3, after short trouble appears in described inductance L 0, described power switch pipe M0 is once open, flow through described power switch pipe M0, described sampling resistor Rcs electric current by abrupt transients to maximum, the pressure drop on described sampling resistor Rcs will increase instantaneously.As shown in Figure 4; because the reference ground GND of described inductance short-circuit protection circuit is connected with described sampling resistor Rcs; the current potential of the reference ground GND of described inductance short-circuit protection circuit is elevated, and now described supply voltage VDD reduces relative to the current potential of the reference ground GND of described inductance short-circuit protection circuit.
As shown in Fig. 3 ~ Fig. 4, in the present embodiment, described sampling resistor R0, R1 sample VDD current potential, sample, and compare with described reference voltage Vref with this pressure reduction to described sampled point and described supply voltage VDD.In the t0 moment, the level after described supply voltage VDD dividing potential drop is lower than described reference voltage Vref, and the comparative result aocp that described comparison module 12 exports overturns as high level, exports the cut-off signals latch of high level and lock through described trigger module 13.The cut-off signals latch of high level through described switch control logic module 15 output low level signal, and produces drive singal drv by described driver module 16, and described in the low level control of described drive singal drv, power switch pipe M0 turns off.Described power switch pipe M0 closes and has no progeny, and no current flows through described sampling resistor Rcs, and the current potential of the reference ground GND of described inductance short-circuit protection circuit reduces.
Described supply voltage VDD recovers relative to the current potential of the reference ground GND of described inductance short-circuit protection circuit afterwards, and it is low level that described comparative result aocp is overturn by high level.Due to the locking of described trigger module 13, described cut-off signals latch still keeps high level, and therefore described power switch pipe M0 continues to turn off.As shown in Figure 4, when described cut-off signals latch is high level, described timing module 14 starts timing, timing time outputs signal reset after continuing t1 be high level pulse signal, unlock 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 described comparative result aocp turns over as after high level, the duration exceedes the setting delay time t2 in described time delay module 17, then described under-voltage protection signal uvlo overturns as high level; namely enter under-voltage locking state, reset re-powers by system.If described comparative result aocp reverts to low level in described setting delay time t2; then described under-voltage protection signal uvlo maintains low level, is namely in non-under-voltage locking state, system worked well; only trigger short-circuit protection mechanism, turn off described power switch pipe M0.
Relative to the under-voltage duration of GND, inductance short-circuit protection circuit of the present utility model, by detecting the pressure reduction between the supply voltage VDD of described inductance short-circuit protection circuit and reference ground GND, judges that controller enters under-voltage locking state or inductance short-circuit protection state according to VDD.If there is the under-voltage burr of of short duration VDD in setting delay time, trigger inductance short-circuit protection; If VDD is under-voltage, the duration exceedes setting delay time, then controller enters under-voltage locking state.Thus ensureing that inductance short-circuit protection mechanism triggers before under-voltage locking state, reliably switch-off power switching tube M0 in time, guarantees the normal work of inductance place circuit, avoids inductance short trouble to the damage of device.
In sum, the utility model provides a kind of inductance short-circuit protection circuit, and described inductance short-circuit protection circuit at least comprises: for realizing the power switch pipe of inductance short-circuit protection; For the sampling resistor of sampling to the output current of described power switch pipe; For the voltage sample module of sampling to the change in voltage on described sampling resistor; For being compared with described reference voltage by sampled voltage, and export the comparison module of comparative result; For sending the cut-off signals of described power switch pipe when described sampled voltage is less than described reference voltage and latching, the trigger module after the timing time of timing module setting, described cut-off signals unlocked; Open shutoff sequential for what determine described power switch pipe, and then control the switch control logic module of switch of described power switch pipe.Relative to the under-voltage duration of GND, inductance short-circuit protection circuit of the present utility model, by detecting the pressure reduction between the supply voltage VDD of described inductance short-circuit protection circuit and reference ground GND, judges that controller enters under-voltage locking state or inductance short-circuit protection state according to VDD.If there is the under-voltage burr of of short duration VDD in setting delay time, trigger inductance short-circuit protection; If VDD is under-voltage, the duration exceedes setting delay time, then controller enters under-voltage locking state.Thus ensureing that inductance short-circuit protection mechanism triggers before under-voltage locking state, reliably switch-off power switching tube M0 in time, guarantees the normal work of inductance place circuit, avoids inductance short trouble to the damage of device.So the utility model effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
Claims (7)
1. an inductance short-circuit protection circuit, is characterized in that, described inductance short-circuit protection circuit at least comprises:
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 output of described power switch pipe, for sampling to the output current of described power switch pipe;
Voltage sample module, is connected between described sampling resistor and supply voltage, for sampling to the change in voltage on described sampling resistor;
Comparison module, connects described voltage sample module and a reference voltage, for being compared with described reference voltage by sampled voltage, and exports comparative result;
Trigger module, connect described comparison module and a timing module, for sending the cut-off signals of described power switch pipe when described sampled voltage is less than described reference voltage and described cut-off signals being 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 output, opens shutoff sequential, and then control the switch of described power switch pipe for what determine described power switch pipe.
2. inductance short-circuit protection circuit according to claim 1; it is characterized in that: the time delay module also comprising the output being connected to described comparison module; when the time that described sampled voltage is less than described reference voltage exceedes setting delay time; trigger under-voltage protection signal, control circuit enters under-voltage locking state.
3. inductance short-circuit protection circuit according to claim 1, it is characterized in that: described inductor loop comprises: the LED module being connected to input voltage, be connected to the inductance of described LED module output, 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.
4. inductance short-circuit protection circuit according to claim 1, is characterized in that: the reverse input end of described comparison module connects described sampled voltage, positive input connects described reference voltage.
5. inductance short-circuit protection circuit according to claim 1; it is characterized in that: described trigger module is rest-set flip-flop; the S end of described rest-set flip-flop is connected to the output of described comparison module, and the R end of described rest-set flip-flop is connected to the output of described timing module.
6. inductance short-circuit protection circuit according to claim 1 or 5, is characterized in that: the input of described timing module is connected to the output of described trigger module, timing from described cut-off signals onset.
7. inductance short-circuit protection circuit according to claim 1; it is characterized in that: one end that described sampling resistor is connected with described power switch pipe is as the reference ground of described inductance short-circuit protection circuit; the reference ground of the other end connected system of described sampling resistor; wherein, described inductance short-circuit protection circuit with reference to the current potential on ground higher than the current potential on described system reference ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460187.3U CN204681329U (en) | 2015-06-30 | 2015-06-30 | A kind of inductance short-circuit protection circuit |
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| CN201520460187.3U CN204681329U (en) | 2015-06-30 | 2015-06-30 | A kind of inductance short-circuit protection circuit |
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| CN204681329U true CN204681329U (en) | 2015-09-30 |
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| CN201520460187.3U Withdrawn - After Issue CN204681329U (en) | 2015-06-30 | 2015-06-30 | A kind of inductance short-circuit protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106330147A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Inductor short circuit protection circuit and method |
| CN106793363A (en) * | 2015-11-20 | 2017-05-31 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
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| CN112290919A (en) * | 2020-09-28 | 2021-01-29 | 苏州锐迪联电子科技有限公司 | Integrated overcurrent protection mechanism for high-current switch tube |
| CN114257225A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Protection circuit and load switch circuit of power switch tube |
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2015
- 2015-06-30 CN CN201520460187.3U patent/CN204681329U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106330147A (en) * | 2015-06-30 | 2017-01-11 | 华润矽威科技（上海）有限公司 | Inductor short circuit protection circuit and method |
| CN106330147B (en) * | 2015-06-30 | 2023-12-15 | 华润微集成电路(无锡)有限公司 | Inductance short-circuit protection circuit and method |
| CN106793363A (en) * | 2015-11-20 | 2017-05-31 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN106793363B (en) * | 2015-11-20 | 2019-04-16 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN107038782A (en) * | 2017-04-14 | 2017-08-11 | 力纳克传动系统（深圳）有限公司 | An a kind of key-lock and the simulation control box device of unblock |
| 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 |
| CN114257225A (en) * | 2020-09-23 | 2022-03-29 | 圣邦微电子（北京）股份有限公司 | Protection circuit and load switch circuit of power switch tube |
| CN112290919A (en) * | 2020-09-28 | 2021-01-29 | 苏州锐迪联电子科技有限公司 | Integrated overcurrent protection mechanism for high-current switch tube |
| CN112290919B (en) * | 2020-09-28 | 2024-03-29 | 苏州锐迪联电子科技有限公司 | Integrated overcurrent protection mechanism for high-current switch tube |
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