CN204333892U - A kind of intrinsically safe circuit improving capacitive load startup ability - Google Patents
A kind of intrinsically safe circuit improving capacitive load startup ability Download PDFInfo
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- CN204333892U CN204333892U CN201420457358.2U CN201420457358U CN204333892U CN 204333892 U CN204333892 U CN 204333892U CN 201420457358 U CN201420457358 U CN 201420457358U CN 204333892 U CN204333892 U CN 204333892U
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Abstract
The utility model discloses a kind of intrinsically safe circuit improving capacitive load startup ability, have: the switch voltage-stabilizing circuit being connected with main supply access, providing constant voltage DC to export; The Correctional tube control circuit be connected with this voltage-stabilizing output circuit; The overcurrent-overvoltage protecting circuit be connected with Correctional tube control circuit, the overvoltage output of this protective circuit Real-Time Monitoring circuit and short circuit and overcurrent export and make adjustment; The counting unit be connected with described overcurrent-overvoltage protecting circuit; The single-shot trigger circuit be connected with described timing unit, these circuits for triggering are connected with described Correctional tube control circuit; When circuit exports generation overcurrent or short circuit, the counting unit described in control starts counting; When counting unit reaches threshold value, described single-shot trigger circuit carries out temporary stable state output state, controls connected Correctional tube control circuit and turns off output; When short circuit or overcurrent recover, the count signal of invalid counting unit; Described Correctional tube output circuit exports normal.
Description
Technical field
The utility model relates to a kind of intrinsically safe circuit that capacitive load can be provided to start ability.Relate to the automatic disconnection emergency protection circuit device for electric that Patent classificating number H02 generates electricity, power transformation or distribution H02H emergency protection circuit device for electric H02H3/00 directly respond the undesirable change of normal electricity work, have or connect H02H3/26 after impunity again to voltage difference or difference between current response; The H02H3/32 of the phase difference response between voltage or between electric current is comprised the magnitude of voltage in respective point on the different conductor of triangular web or current value are compared, such as, compare the electric current in go and return conductor.
Background technology
Intrinsically safe circuit part many employings linear voltage stabilization way of output of traditional mine intrinsic safety electric source, by constant current output as the Main Means suppressing sparkover, work as transcient short circuit time, electric current increases rapidly, finally be limited to constant current maximum, when load current continues to increase, because Correctional tube two ends pressure reduction is larger, the power consumption of Correctional tube can significantly increase, thermal stability is bad, cause Correctional tube to generate heat to burn out, and adopt switch-type stabilized to export essence safety type circuits, due to the capacitive of circuit output end and perception larger, sparkover can only be suppressed by turning off Correctional tube fast, during short circuit, the energy of abrupt release is larger, detect controller to turn off fast, but to have capacitive load supplying moment, often can reach over-current protection point rapidly, cause overcurrent protection action, load capacity is not strong.
At present, the essence safety type circuits efficiency exported based on linear voltage stabilization is low, when heavy load is powered; because input and output pressure reduction are comparatively large, Correctional tube power consumption is higher, and caloric value is high; even if increase the fin that volume is larger, thermal stability is still bad, and high based on the essence safety type circuits efficiency of switch voltage-stabilizing output; do not generate heat; volume is little, but load capacity extreme difference, especially in capacitive load start-up course; instantaneous large-current impact can cause overcurrent protection, causes load to start.
Utility model content
The utility model is in the intrinsically safe circuit capacitive load start-up course of prior art; the moment that load is starting can produce heavy current impact; cause overcurrent protection; and the problem that continuous overcurrent protection mechanism can cause load to start; the a kind of of development improves the intrinsically safe circuit that capacitive load starts ability, has:
The switch voltage-stabilizing circuit being connected with main supply access, providing constant voltage DC to export; The Correctional tube control circuit be connected with this voltage-stabilizing output circuit, in this circuit, the output of Correctional tube is that final circuit exports; The overcurrent-overvoltage protecting circuit be connected with Correctional tube control circuit, the overvoltage output of this protective circuit Real-Time Monitoring circuit and short circuit and overcurrent export and make adjustment; The counting unit be connected with described overcurrent-overvoltage protecting circuit; The single-shot trigger circuit be connected with described timing unit, these circuits for triggering are connected with described Correctional tube control circuit; When described overcurrent-overvoltage protecting circuit detects that circuit exports generation overcurrent or short circuit, the counting unit described in control starts counting; When counting unit reaches threshold value, described single-shot trigger circuit carries out temporary stable state output state, controls connected Correctional tube control circuit and turns off output; When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent recovers, the count signal of invalid counting unit; Described single-shot trigger circuit becomes lower state, and described Correctional tube output circuit exports normal.Cause the reason of overcurrent for capacitive load startup and short circuit two kinds, set time threshold, when overtime threshold value, can assert that open circuit occurs, breaking circuit at once; When not having overtime threshold value, circuit does not turn off, and the overcurrent repeated trigger overcurrent protection mechanism preventing from capacitive load from starting causing, causes power supply can not normally start all the time.
As a preferably execution mode, described overcurrent-overvoltage protecting circuit comprises a comparator be connected with described Correctional tube control circuit, this comparator gathers the level of over-current signal that described Correctional tube control circuit produces and baseline signal level compares, when over-current signal being detected, export one to described counting unit and reset count signal, trigger described counting unit and start counting; When detecting that over-current signal disappears, send stopping count signal to described counting unit.
Further, overcurrent and short circuit is being considered simultaneously as intrinsically safe circuit, also reply Correctional tube control circuit is needed may to occur the situation of overvoltage, therefore preferred, described overcurrent-overvoltage protecting circuit gathers the level of described Correctional tube control circuit overvoltage signal and baseline signal level compares; When detecting overvoltage signal, the Correctional tube control circuit described in control turns off and exports.
As a preferably execution mode, the core component of described Correctional tube control circuit comprises a PMOS I be connected with described overcurrent-overvoltage protecting circuit, and when circuit normally exports, this PMCS pipe I is conducting state; When circuit overvoltage or overcurrent (short circuit); output state by described overcurrent-overvoltage protecting circuit (overvoltage condition) or single-shot trigger circuit (overcurrent or short-circuit condition) controls; grid voltage and the source voltage of PMOS I are equal; metal-oxide-semiconductor is closed and is exported, i.e. the output of breaking circuit.Select PMOS as the Correctional tube control circuit of core component, the load switch usually adopted compared to prior art can have wider voltage range of choice, especially during high voltage, does not have suitable load switch corresponding; Relative and relay switch has the advantage of fast response time.
As a preferably execution mode, described counting unit comprises one and continues to send the pulse generating circuit of impulse wave and a pulse-scaling circuit be connected with this circuit for generating at output, and described continuous impulse ripple is the input signal of this counting circuit; The clearing exported by described overcurrent-overvoltage protecting circuit counts input signal resets counting end control signal as counting circuit; If control signal is effective, then described pulse-scaling circuit starts counting; If control signal is invalid, then described pulse-scaling circuit stops counting.Adopt these two kinds of modes effectively can solve the problem of the reliability that powers on for the first time.
Further, consider some environment for use of circuit, such as collieries etc. require that safety circuit does not produce spark in the course of the work usually, therefore a spark suppression circuit is provided with between described switch voltage-stabilizing circuit and Correctional tube control circuit, as a preferably execution mode, this circuit comprises a PMOS II, and the source electrode of this PMOS II is connected with the resistance of a Limited Current, is parallel with 2 triodes at the two ends of this resistance;
When capacitive load starts instantaneously or is short-circuited, the voltage at resistance R2 two ends can be greater than rapidly the threshold voltage of two described triodes, two triode transient switchings, PMOS IQ2 is ended, and circuit is turned off, and now output current declines rapidly, when resistance both end voltage returns to lower than triode ON threshold value, PMOS IQ2 continues conducting, repeats said process, until circuit overcurrent condition is eliminated.
As a preferably execution mode, described overcurrent-overvoltage protecting circuit is dual overcurrent-overvoltage protecting circuit.
Owing to have employed above-mentioned count protocol; a kind of intrinsically safe circuit improving capacitive load startup ability that the utility model provides; by arranging dual overcurrent-overvoltage protecting circuit; counting unit and single-shot trigger circuit; significantly improve the startup ability of capacitive load; superior performance when particularly the large capacitive load of remote power-feeding being started; and possess high reliability; adopt overcurrent turn-off function mode that product thermal stability is strengthened further; efficiency improves; greatly reduce the volume of circuit simultaneously, reduce cost.
Accompanying drawing explanation
In order to the count protocol of clearer explanation embodiment of the present utility model or existing counting, introduce doing one to the required accompanying drawing used in embodiment or the description of existing counting simply below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for the common counting personnel in this area, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is system module figure of the present utility model
Fig. 2 is the utility model switch voltage-stabilizing circuit figure
Fig. 3 is the utility model spark suppression circuit figure
Fig. 4 is the utility model Correctional tube control circuit figure
Fig. 5 is the utility model single-shot trigger circuit circuit diagram
Fig. 6 is the utility model pulse generating circuit circuit diagram
Fig. 7 is the circuit diagram of pulse-scaling circuit
Fig. 8 is dual overcurrent-overvoltage protecting circuit circuit diagram
Embodiment
For making the object of embodiment of the present utility model, count protocol and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, clear complete description is carried out to the count protocol in the utility model embodiment:
Embodiment 1; as described in Figure 1 a kind of provides capacitive load to start the intrinsically safe circuit of ability, mainly comprises: dual overcurrent-overvoltage protecting circuit, pulse-scaling circuit, pulse generating circuit and single-shot trigger circuit that switch voltage-stabilizing circuit, spark suppression circuit, the Correctional tube control circuit finally exported as circuit, Real-Time Monitoring Correctional tube control circuit overcurrent or overvoltage export.
When described overcurrent-overvoltage protecting circuit detects that circuit exports generation overcurrent or short circuit, the counting unit described in control starts counting; When counting unit reaches threshold value, described single-shot trigger circuit carries out temporary stable state output state, controls connected Correctional tube control circuit and turns off output.
When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent, the over-current detection part control impuls counting circuit of dual overcurrent-overvoltage protecting circuit is effective, the pulse signal of pulse-scaling circuit paired pulses circuit for generating is immediately counted, after reaching predetermined value, monostable circuits for triggering enter temporary stable state output state, control Correctional tube control circuit and turn off output, and when short circuit being detected or overcurrent recovers, the over-current detection part control impuls counting circuit of dual overcurrent-overvoltage protecting circuit is invalid, pulse-scaling circuit is made to stop the pulse signal of paired pulses circuit for generating to count, like this, single-shot trigger circuit is still in lower state, can self-recoverage when making to be short-circuited Failure elimination, when starting large capacitive load or remote power-feeding instantaneously, over-current detection point can not be reached because of the High-current output of moment, be unlikely to misoperation and turn off output, effective raising starts large capacitive load ability, and there is high reliability.When described overcurrent-overvoltage protecting circuit monitors circuit output generation overvoltage, the Correctional tube control circuit described in directly controlling turns off and exports.
Described switch voltage-stabilizing circuit is as shown in Figure 2: comprise chip U2, and the 4th pin of this chip exports (V0) input as spark suppression circuit.This circuit is used for providing voltage stabilizing to export, can be preferred, voltage reduction module LM2596 voltage reduction module, can reduced output voltage setting voltage, in the present embodiment, set this voltage reduction module the voltage of 26-37V is down to setting 24V export.
Or selecting buck module MC34063 to provide larger input voltage range, the 24V in the present embodiment voltage of 5-40V being become setting exports.
Also can select special power module of voltage regulation ZB15, input range is 18-36V, exports the 24V voltage of setting.
The core of described spark suppression circuit is that the source electrode of a PMOS Q2, this PMOS Q2 is connected with described switch voltage-stabilizing circuit by a resistance R2, and the grounded-grid of PMOS Q2, drains as the output of spark suppression circuit, as shown in Figure 3 VP.Be connected to affiliated resistance R2 between the base stage of triode Q5 and emitter, the collector electrode of described triode Q5 is by resistance R11 ground connection, and triode Q6 is in parallel with described triode Q5.
PMOS Q2 is when powering on first or normal condition is in conducting state, R2 is used for Limited Current, when capacitive load starts instantaneously or is short-circuited, the voltage at resistance R2 two ends can be greater than rapidly the threshold voltage of triode Q5 and triode Q6, and triode Q5 and triode Q6 transient switching, make PMOS IQ2 end, circuit is turned off, now output current declines rapidly, and when resistance R2 both end voltage returns to lower than triode Q5 and triode Q6 conduction threshold, PMOS IQ2 continues conducting.So repeatedly, until overcurrent condition is eliminated.R3 and R11 is as the dividing potential drop of Q2 grid and source electrode, and when normally working, due to the dividing potential drop effect of R3 and R11, V0 is greater than the grid voltage of Q2, Q2 normally; When overcurrent, the voltage of V0 is equal with the grid voltage of PMOS Q2.
In the present embodiment, triode Q5 and triode Q6 selects S9012, and the voltage of its conducting is 0.7V.It is 1.4 Ω that PMOS Q2 selects the resistance of IRF9630, R3 and R11 to be 100k, R2.R2's is 500mA by current threshold, when by electric current more than 500mA time, R2 produce pressure drop make triode Q5 and Q6 conducting, now, in circuit, the voltage of AB 2 is equal, thus Q2 is turned off.Under normal condition, circuit input 24V exports and is also close to 24V.According to the characteristic of PMOS, as VG=VS, PMOS turns off, as VG < VS-Vth, and PMOS conducting.
As shown in Figure 4: described Correctional tube control circuit mainly comprises: in order to strengthen PMOS Q3 and the PMOS Q4 of two series connection that system reliability is arranged, be connected with spark suppression circuit and dual overcurrent-overvoltage protecting circuit respectively.The source electrode of PMOS Q3 and the output of described spark suppression circuit, VP connects as shown in the figure, and the drain electrode of PMOS Q4, VOUT is as the output of circuit as shown in the figure.
Difference adjusting resistance R7 and R8 in parallel between the source electrode of PMOS Q3 and PMOS Q4 and grid.
PMOS Q3 is connected with described dual overcurrent-overvoltage protecting circuit and single-shot trigger circuit respectively with the grid of Q4.Wherein, PMOS Q3 is connected with single-shot trigger circuit by a diode D4, accepts turn off from the mistake flow control signals of single-shot trigger circuit and recover conducting.Also be connected with described dual overcurrent-overvoltage protecting circuit by a diode D6, accept the control signal from dual overcurrent-overvoltage protecting circuit.Wherein, diode D4 and diode D6 ensures the one-way flow of control signal.
Same, PMOS Q4 is connected with single-shot trigger circuit by a diode D5, accepts turn off from the mistake flow control signals of single-shot trigger circuit and recover conducting; Be connected with described dual overcurrent-overvoltage protecting circuit by a diode D6, accept the control signal from dual overcurrent-overvoltage protecting circuit.
In the present embodiment, the input voltage VP of this Correctional tube control circuit and output voltage VO UT is 24V under normal circumstances.Wherein OC_CTLA and OC_CTLB crosses flow control signals and OV_CTLA and OV_CTLB overvoltage control signal is 24V.
In circuit, PMOS Q3 and Q4 all selects AOD425, and adjusting resistance R7 and R8 is that 100k resistance R12, R13, R17 and R18 are 51k.
When OC_CTLA and/or OC_CTLB inputs the signal of corresponding 24V, described Q3 and/or Q4 turns off.
Same, when OV_CTLA and OV_CTLB inputs the signal of corresponding 24V, described Q3 and/or Q4 turns off.
The input of described dual overcurrent-overvoltage protecting circuit is connected (vout) with the output of described Correctional tube control circuit; for acquisition and processing overvoltage, overcurrent or short circuit; mainly comprise: in order to the reliability increasing system is provided with two comparators; comparator U14 and comparator U141; comparator is divided into the part of process overcurrent and the part of process overvoltage; here be described for comparator U14, as shown in Figure 8: the model that comparator adopts can be preferably LM293A.
No. 8 pins (VCC) of comparator U14 connect the collector electrode of a triode Q13, No. 1 pin (Vout1) connects the base stage of described triode Q13, and the emitter of triode Q13 exports the clearing count signal of control signal (as shown in the figure out0) as pulse-scaling circuit as processing overcurrent.
No. 7 pins (vout2) of the latter half of described comparator U14 are connected with the base stage of triode Q19 by resistance R51, No. 4 pins are connected with the emitter of triode Q19, triode Q19 is connected with triode Q9 by a resistance R47, the overvoltage control signal exported by No. 7 pins, export Correctional tube control circuit to by the collector electrode of triode Q9, complete its switching.
The form of comparator 141 is consistent with the form of comparator U14, is exported reset count signal (out0) by the emitter of triode Q131; The signal controlling the switching of Correctional tube control circuit is exported by the collector electrode of triode Q91.
Pulse-scaling circuit comprises with chip U11, and the counting reset signal (out0) that No. 1 pin of chip accepts the transmission of dual overcurrent-overvoltage protecting circuit starts to reset counting; No. 2 pins accept the QCLK signal exported by pulse generating circuit, i.e. pulse signal, and No. 12 pins export the signal controlling described single-shot trigger circuit work.
As shown in Figure 5: described single-shot trigger circuit comprises two chip U9 and chip U19, for chip U9, pulse-scaling circuit export signal, out1 as shown in Figure 5, the signal exported is exported by No. 13 pins, input the base stage of a triode Q17, exported to the base stage of triode Q7 by the collector electrode of triode Q17, finally export described Correctional tube control circuit to by the collector electrode of triode Q7, as the control signal that PMOS in Correctional tube control circuit is opened and turned off, signal is 24V in the present embodiment.Preferably, the model of described Q7 and Q8 is the model of S8550, Q17 and Q18 is S8050.
Equipment described in the present embodiment, through overtesting, normally can start that to be serially connected in total length be 3km, at least 3 capacitive loads on 1.5 squares of circuits, have splendid application prospect.
The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; any counting personnel being familiar with this counted fields are in the count range that the utility model discloses; be equal to according to count protocol of the present utility model and utility model design thereof and replace or change, all should be encompassed within protection range of the present utility model.
Claims (8)
1. improve the intrinsically safe circuit that capacitive load starts ability, have:
The switch voltage-stabilizing circuit being connected with main supply access, providing constant voltage DC to export;
The Correctional tube control circuit be connected with this voltage-stabilizing output circuit, in this circuit, the output of Correctional tube is that final circuit exports;
The overcurrent-overvoltage protecting circuit be connected with Correctional tube control circuit, the overvoltage output of this protective circuit Real-Time Monitoring circuit and short circuit and overcurrent export and make adjustment;
The counting unit be connected with described overcurrent-overvoltage protecting circuit;
The single-shot trigger circuit be connected with described counting unit, these circuits for triggering are connected with described Correctional tube control circuit;
When described overcurrent-overvoltage protecting circuit detects that circuit exports generation overcurrent or short circuit, the counting unit described in control starts counting; When counting unit reaches threshold value, described single-shot trigger circuit carries out temporary stable state output state, controls connected Correctional tube control circuit and turns off output;
When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent recovers, the count signal of invalid counting unit; Described single-shot trigger circuit becomes lower state, and described Correctional tube output circuit exports normal.
2. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 1, be further characterized in that described overcurrent-overvoltage protecting circuit comprises a comparator be connected with described Correctional tube control circuit, this comparator gathers the level of over-current signal that described Correctional tube control circuit produces and baseline signal level compares, when over-current signal being detected, export one to described counting unit and reset count signal, trigger described counting unit and start counting; When detecting that over-current signal disappears, send stopping count signal to described counting unit.
3. a kind of capacitive load that improves according to claim 1 and 2 starts the intrinsically safe circuit of ability, is further characterized in that described overcurrent-overvoltage protecting circuit gathers the level of described Correctional tube control circuit overvoltage signal and baseline signal level compares; When detecting overvoltage signal, the Correctional tube control circuit described in control turns off and exports.
4. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 3, is further characterized in that:
Described Correctional tube control circuit comprises a PMOS I be connected with described overcurrent-overvoltage protecting circuit, and when circuit normally exports, this PMOS I is conducting state; When circuit overvoltage or overcurrent, the output state by described overcurrent-overvoltage protecting circuit or single-shot trigger circuit controls, and grid voltage and the source voltage of PMOS I are equal, and PMOS I closes output, i.e. the output of breaking circuit.
5. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 2, be further characterized in that described counting unit comprises one and continues to send the pulse generating circuit of impulse wave and a pulse-scaling circuit be connected with this circuit for generating at output, pulse is the input signal of this counting circuit; The clearing exported by described overcurrent-overvoltage protecting circuit counts input signal resets counting end control signal as counting circuit; If control signal is effective, then described pulse-scaling circuit starts counting; If control signal is invalid, then described pulse-scaling circuit stops counting.
6. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 1, be further characterized in that and be provided with a spark suppression circuit between described switch voltage-stabilizing circuit and Correctional tube control circuit, this circuit comprises a PMOS II, the source electrode of this PMOS II is connected with the resistance I of a Limited Current, is parallel with 2 triodes at the two ends of this resistance;
When capacitive load starts instantaneously or is short-circuited, the voltage at resistance I two ends can be greater than rapidly the threshold voltage of two described triodes, two triode ON, PMOS II is ended, circuit is turned off, and now output current declines rapidly, when resistance both end voltage returns to lower than triode ON threshold value, PMOS II continues conducting, suppresses the generation of electric spark.
7. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 1,2,5 or 6, is further characterized in that: described overcurrent-overvoltage protecting circuit is dual overcurrent-overvoltage protecting circuit.
8. a kind of intrinsically safe circuit improving capacitive load startup ability according to claim 1, described switch voltage-stabilizing circuit is DC/DC switch voltage-stabilizing circuit, step-up/down switch voltage-stabilizing module or buck switch voltage-stabilizing module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420457358.2U CN204333892U (en) | 2014-08-10 | 2014-08-10 | A kind of intrinsically safe circuit improving capacitive load startup ability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420457358.2U CN204333892U (en) | 2014-08-10 | 2014-08-10 | A kind of intrinsically safe circuit improving capacitive load startup ability |
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| CN204333892U true CN204333892U (en) | 2015-05-13 |
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| CN201420457358.2U Expired - Fee Related CN204333892U (en) | 2014-08-10 | 2014-08-10 | A kind of intrinsically safe circuit improving capacitive load startup ability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201641A (en) * | 2014-08-10 | 2014-12-10 | 阚建峰 | Intrinsically safe circuit for improving capacitive load start capacity |
| WO2020042329A1 (en) * | 2018-08-31 | 2020-03-05 | 重庆惠科金渝光电科技有限公司 | Drive circuit and drive system |
| CN115802550A (en) * | 2022-12-08 | 2023-03-14 | 珠海市圣昌电子有限公司 | High-reliability short-circuit protection circuit for PWM dimming |
-
2014
- 2014-08-10 CN CN201420457358.2U patent/CN204333892U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201641A (en) * | 2014-08-10 | 2014-12-10 | 阚建峰 | Intrinsically safe circuit for improving capacitive load start capacity |
| CN104201641B (en) * | 2014-08-10 | 2018-09-07 | 阚建峰 | A kind of intrinsicallysafecircuit for improving capacitive load and starting ability |
| WO2020042329A1 (en) * | 2018-08-31 | 2020-03-05 | 重庆惠科金渝光电科技有限公司 | Drive circuit and drive system |
| US11238822B2 (en) | 2018-08-31 | 2022-02-01 | Chongqing Hkc Optoelectronics | Drive circuit and drive system |
| CN115802550A (en) * | 2022-12-08 | 2023-03-14 | 珠海市圣昌电子有限公司 | High-reliability short-circuit protection circuit for PWM dimming |
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