CN112701656A - Guard grating circuit - Google Patents
Guard grating circuit Download PDFInfo
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- CN112701656A CN112701656A CN202011582865.5A CN202011582865A CN112701656A CN 112701656 A CN112701656 A CN 112701656A CN 202011582865 A CN202011582865 A CN 202011582865A CN 112701656 A CN112701656 A CN 112701656A
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- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 230000005669 field effect Effects 0.000 claims abstract description 40
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 230000001052 transient effect Effects 0.000 abstract description 6
- 230000004888 barrier function Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses a safety gate circuit which comprises a trigger, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a voltage stabilizing source, a first field effect transistor, a second field effect transistor, an NPN (negative-positive-negative) transistor, a plurality of resistors, a plurality of capacitors, a plurality of diodes, three voltage stabilizing diodes and a light emitting diode, wherein the trigger is connected with the trigger; the advantage is that the transient short circuit performance is better.
Description
Technical Field
The invention belongs to the technical field of safety barriers, and particularly relates to a safety barrier circuit.
Background
Intrinsic safety is an explosion-proof method that uses safety barrier technology to limit the amount of electrical energy provided to field instruments to a safe range that can neither produce a spark sufficient for ignition nor produce a surface temperature of the instrument sufficient for ignition, thereby eliminating the source of the ignition, while safety barriers are the most commonly used associated devices in intrinsically safe explosion-proof systems. The safety grid circuit has the functions of overvoltage protection, overcurrent protection and short-circuit protection, the input end of the safety grid circuit is connected with the non-intrinsic safety circuit, and the output end of the safety grid circuit is connected with the intrinsic safety circuit.
However, when the conventional safety barrier circuit is actually used, the transient short circuit overshoot area is as high as 58mAs, the maximum peak current is 31A, and the standard requirement is less than 26uAs, so the transient short circuit performance of the conventional safety barrier circuit is poor.
Disclosure of Invention
The invention aims to provide a safety gate circuit with better transient short circuit performance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a safety gate circuit comprises a NE555 type trigger, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a voltage stabilizing source, a first field effect transistor, a second field effect transistor, an NPN (negative-positive-negative) transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first voltage stabilizing diode, a second voltage stabilizing diode, a third voltage stabilizing diode, a fourth operational amplifier, a fifth operational amplifier, the second voltage stabilizing diode, the third voltage stabilizing diode and the light emitting diode, wherein one end of the first resistor, the source electrode of the first field effect transistor, the source electrode of the second field effect transistor, the cathode of the first diode, one end of the second resistor, one end of the third resistor and the power input end are connected, the other end of the first resistor, one end of the first capacitor, the cathode of the second diode, one end of the fourth resistor, the eighth pin of the trigger, the fourth pin of the trigger, one end of the fifth resistor, one end of the sixth resistor, the collector of the NPN transistor and the voltage input end of the fourth operational amplifier are connected, the base of the NPN transistor is connected with the output end of the fourth operational amplifier, the other end of the fourth resistor, one end of the seventh resistor, the first terminal of the first resistor, the second terminal of the second field effect transistor, the cathode of the first diode, one end of the second resistor, one end of the third resistor and the power input end of the power supply are connected, and the other end of, The sixth pin of the flip-flop is connected with one end of the second capacitor, the other end of the seventh resistor is connected with the seventh pin of the flip-flop, the fifth pin of the flip-flop is connected with one end of the third capacitor, the second pin of the flip-flop, the gate of the second field effect transistor and one end of the eighth resistor are connected, the third pin of the flip-flop, one end of the fourth capacitor, the anode of the third diode and one end of the ninth resistor are connected, the other end of the fourth capacitor, the cathode of the third diode, the other end of the ninth resistor, the drain of the second field effect transistor, the other end of the second resistor and the gate of the first field effect transistor are connected, and the other end of the eighth resistor, the other end of the fifth resistor, the gate of the eighth resistor and the gate of the eighth resistor, The anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode are connected, the cathode of the fourth diode is connected with the output end of the first operational amplifier, the negative input end of the first operational amplifier is connected with one end of the tenth resistor, the other end of the tenth resistor, one end of the sixteenth resistor and one end of the seventeenth resistor are connected, the positive input end of the first operational amplifier, the positive input end of the second operational amplifier and one end of the eleventh resistor are connected, the other end of the eleventh resistor, the other end of the sixth resistor, the first pin of the voltage stabilizing source, the second pin of the voltage stabilizing source and one end of the thirteenth resistor are connected, the negative input end of the second operational amplifier is connected with one end of the twelfth resistor, the output end of the second operational amplifier is connected with the negative electrode of the fifth diode, the other end of the twelfth resistor, one end of the eighteenth resistor and the emitter of the NPN tube, the negative input end of the third operational amplifier, the other end of the thirteenth resistor and one end of the fourteenth resistor are connected, the positive input end of the third operational amplifier, one end of the fifteenth resistor, the positive electrode of the second diode, one end of the fifth capacitor and the negative electrode of the first zener diode are connected, the output end of the third operational amplifier is connected with the negative electrode of the sixth diode, the positive input end of the fourth operational amplifier is connected with one end of the nineteenth resistor, the negative input end of the fourth operational amplifier is connected with one end of the twentieth resistor, and the other end of the twentieth resistor, The other end of the eighteenth resistor and one end of the twenty-first resistor are connected, the other end of the nineteenth resistor, one end of the twenty-second resistor, one end of the twenty-third resistor, the anode of the second zener diode and the anode of the third zener diode are connected, the other end of the twenty-third resistor is connected with the cathode of the light emitting diode, the drain of the first field effect transistor, the anode of the first diode, the other end of the third resistor, the other end of the seventeenth resistor, the other end of the fifteenth resistor, the other end of the fifth capacitor, the anode of the light emitting diode, the cathode of the second zener diode, the cathode of the third zener diode and the intrinsically safe output end are connected, and the other end of the first capacitor, the anode of the second capacitor, the cathode of the second zener diode, the cathode of the third zener diode and the intrinsically safe output end are connected, The other end of the second capacitor, the other end of the third capacitor, the first pin of the trigger, the other end of the sixteenth resistor, the third pin of the voltage regulator, the other end of the fourteenth resistor, the cathode of the first voltage regulator diode, the grounding end of the fourth operational amplifier, the other end of the twenty-first resistor and the other end of the twenty-second resistor are grounded.
In this embodiment, the safety gate circuit further includes an inductor and a seventh diode, one end of the inductor, a cathode of the seventh diode, a drain of the first field effect transistor and an anode of the first diode are connected, and the other end of the inductor, an anode of the seventh diode, the other end of the third resistor, the other end of the seventeenth resistor, the other end of the fifteenth resistor, the other end of the fifth capacitor, an anode of the light emitting diode, a cathode of the second zener diode, a cathode of the third zener diode and an intrinsically safe output terminal are connected.
Compared with the prior art, the invention has the advantages that when the output end of the intrinsic safety circuit is subjected to voltage drop, such as the voltage drops from 12V to below 8V, because the two ends of the fifth capacitor cannot suddenly change, the left end of the fifth capacitor is dropped from 5V to below 1V, the third comparator outputs low voltage, the second field effect transistor is controlled to be connected through the sixth diode and the eighth resistor, the first field effect transistor is disconnected in advance, meanwhile, the low voltage is input to the second pin of the trigger, after the trigger is triggered internally, the third pin of the trigger outputs high voltage, the first field effect transistor is cut off after the high voltage passes through the third diode, the first field effect transistor and the second field effect transistor are matched with the rapid-off output power supply, the circuit breaking is controlled within 10us, the maximum peak current is 2A, at the moment, the transient short circuit overshoot area is only 18uAs, and is lower than the standard requirement, the performance is better, and.
Drawings
FIG. 1 is an actual view of a conventional barrier circuit;
FIG. 2 is a schematic circuit diagram of the present invention;
fig. 3 is an actual view of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows: as shown in fig. 2 and 3, a safety gate circuit includes a flip-flop U1 with a model number of NE555, a first operational amplifier U1A, a second operational amplifier U1B, a third operational amplifier U1C, a fourth operational amplifier U1D, a voltage regulator U2, a first field effect transistor Q1, a second field effect transistor Q2, an NPN transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R36 17, an eighteenth resistor R18, a ninth resistor R12, a thirteenth resistor R8272, a fourteenth resistor R14, a fifteenth resistor R15, a twenty-fourth resistor R19, a twenty-third capacitor R19, a twenty-C19, a third capacitor R, A fifth capacitor C5, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a first zener diode D7, a second zener diode D8, a third zener diode D9 and a light emitting diode DS 1.
In this embodiment, one end of a first resistor R1, a source of the first fet Q1, a source of the second fet Q2, a cathode of the first diode D1, one end of the second resistor R2, one end of the third resistor R3, and a power input terminal are connected, the other end of the first resistor R1, one end of a first capacitor C1, a cathode of the second diode D2, one end of a fourth resistor R4, an eighth pin of the flip-flop U1, a fourth pin of the flip-flop U1, one end of a fifth resistor R5, one end of a sixth resistor R6, a collector of an NPN Q3, and a voltage input terminal of the fourth operational amplifier U1D are connected, a base of the NPN Q3 is connected to an output terminal of the fourth operational amplifier U1D, the other end of the fourth resistor R4, one end of a seventh resistor R7, a sixth pin of the flip-flop U1, and one end of the second capacitor C2, the other end of the seventh resistor R2 is connected to the first terminal 2 of the flip-flop U2, and the first terminal 2, a second pin of the flip-flop U1, a gate of the second field effect transistor Q2 and one end of an eighth resistor R8 are connected, a third pin of the flip-flop U1, one end of a fourth capacitor C4, an anode of a third diode D3 and one end of a ninth resistor R9 are connected, the other end of the fourth capacitor C4, a cathode of the third diode D3, the other end of the ninth resistor R9, a drain of the second field effect transistor Q2, the other end of the second resistor R2 and a gate of the first field effect transistor Q1 are connected, the other end of the eighth resistor R8, the other end of the fifth resistor R42, an anode of the fourth diode D4, an anode of the fifth diode D5 and an anode of the sixth diode D6 are connected, a cathode of the fourth diode D4 is connected with an output end of the first operational amplifier U1A, a negative input end of the first operational U1A is connected with one end of the tenth resistor R10, a terminal of the tenth resistor R10, a sixteenth resistor R16 and a terminal of the resistor R363658, the positive input end of a first operational amplifier U1A, the positive input end of a second operational amplifier U1B and one end of an eleventh resistor R11 are connected, the other end of the eleventh resistor R11, the other end of a sixth resistor R6, a first pin of a voltage regulator U2, a second pin of the voltage regulator U2 and one end of a thirteenth resistor R13 are connected, the negative input end of the second operational amplifier U1B is connected with one end of a twelfth resistor R12, the output end of the second operational amplifier U1B is connected with the negative electrode of a fifth diode D5, the other end of the twelfth resistor R12, one end of an eighteenth resistor R18 and the emitter of a tube Q3 are connected, the negative input end of a third operational amplifier U1C, the other end of a thirteenth resistor R13 and one end of a fourteenth resistor R14 are connected, the NPN terminal of the third operational amplifier U1C, one end of a fifteenth resistor R15, the positive electrode of a second diode D2, the positive electrode of a fifth capacitor C28 and the negative electrode of a first voltage regulator D7379 are connected, the output end of the third operational amplifier U1C is connected with the cathode of a sixth diode D6, the positive input end of the fourth operational amplifier U1D is connected with one end of a nineteenth resistor R19, the negative input end of the fourth operational amplifier U1D is connected with one end of a twentieth resistor R20, the other end of the twentieth resistor R20, the other end of an eighteenth resistor R18 and one end of a twenty-first resistor R21 are connected, the other end of the nineteenth resistor R19, one end of a twenty-second resistor R22, one end of a twenty-third resistor R23, the anode of a second zener diode D8 and the anode of a third zener diode D9, the other end of the twenty-third resistor R23 is connected with the cathode of a light emitting diode DS1, the drain of a first field effect transistor Q1, the anode of a first diode D1, the other end of a third resistor R3, the other end of a seventeenth resistor R17, the other end of a fifteenth resistor R15, the other end of a fifth resistor R5928, the anode of a fifth resistor C5, the light emitting, The negative electrode of the second zener diode D8, the negative electrode of the third zener diode D9 and the intrinsic safety output end are connected, the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, the first pin of the flip-flop U1, the other end of the sixteenth resistor R16, the third pin of the regulator U2, the other end of the fourteenth resistor R14, the negative electrode of the first zener diode D7, the ground terminal of the fourth operational amplifier U1D, the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22 are grounded.
In this embodiment, the voltage regulator U2 is a controllable precision voltage regulator of model TL 431.
Example two: the rest of the circuit is the same as the first embodiment, and the circuit is different in that the circuit further includes an inductor L1 and a seventh diode D10, one end of the inductor L1, the cathode of the seventh diode D10, the drain of the first field effect transistor Q1 and the anode of the first diode D1 are connected, the other end of the inductor L1, the anode of the seventh diode D10, the other end of the third resistor R3, the other end of the seventeenth resistor R17, the other end of the fifteenth resistor R15, the other end of the fifth capacitor C5, the anode of the light emitting diode DS1, the cathode of the second zener diode D8, the cathode of the third zener diode D9 and the intrinsically safe output terminal, and the circuit is cut off when the output current rises slowly due to the fact that the current through the inductor L1 cannot change suddenly due to the arrangement of the inductor L1.
Under the normal working condition, the voltage of the intrinsic safety output end is 12V, the power is supplied to the first voltage stabilizing diode D7 after passing through the fifteenth resistor R15, the voltage of the left end of the fifth capacitor C5 is controlled to be about 5V, meanwhile, the first pin of the voltage stabilizing source U2 outputs 2.5V reference voltage, the reference voltage is divided by the thirteenth resistor R13 and the fourteenth resistor R14, so that the negative input end of the third operational amplifier U1C is kept at 1V, at this time, the output end of the third operational amplifier U1C outputs high voltage, and the sixth diode D6 isolates the high voltage and does not work.
When the output is short-circuited, the voltage of the intrinsically safe output end is reduced, when the voltage at the two ends of the fifth capacitor C5 is reduced to be lower than 8V from 12V, the voltage at the left end of the fifth capacitor C5 is reduced to be lower than 1V from 5V, the output end of the third operational amplifier U1C outputs low voltage, the second field effect transistor Q2 is controlled to be connected after passing through a sixth diode D6 and an eighth resistor R8, the first field effect transistor Q1 is disconnected in advance, meanwhile, the low voltage is input to the second pin of the trigger U1, after internal triggering of the trigger U1, the third pin of the trigger U1 outputs high voltage, the high voltage cuts off the first field effect transistor Q1 after passing through a third diode D3, the fast disconnection output power supply of the first field effect transistor Q1 is matched with the second field effect transistor, the disconnection is controlled within 10us, the maximum peak current is 2A, and at the moment, the transient short-circuit area is only 18uAs which is lower than the standard requirement, the performance; when the output is recovered, the second pin of the flip-flop U1 becomes high voltage, the second field-effect transistor Q2 is controlled to be turned off, the second capacitor C2 is slowly charged by the fourth resistor R4, the voltage at the sixth pin of the flip-flop U1 slowly rises, after a period of time, the third pin of the flip-flop U1 outputs low voltage, the first field-effect transistor Q1 is controlled to be turned on, and the intrinsically safe output end recovers power supply.
Claims (2)
1. A safety gate circuit is characterized by comprising a trigger with the model number of NE555, a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier, a voltage regulator, a first field effect transistor, a second field effect transistor, an NPN transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a seventh resistor, a, A sixth diode, a first voltage regulator diode, a second voltage regulator diode, a third voltage regulator diode and a light emitting diode, wherein one end of the first resistor, the source electrode of the first field effect transistor, the source electrode of the second field effect transistor, the cathode of the first diode, one end of the second resistor, one end of the third resistor and the power input end are connected, the other end of the first resistor, one end of the first capacitor, the cathode of the second diode, one end of the fourth resistor, the eighth pin of the trigger, the fourth pin of the trigger, one end of the fifth resistor, one end of the sixth resistor, the collector of the NPN transistor and the voltage input end of the fourth operational amplifier are connected, the base of the NPN transistor is connected with the output end of the fourth operational amplifier, the other end of the fourth resistor, one end of the seventh resistor, the sixth pin of the flip-flop and one end of the second capacitor are connected, the other end of the seventh resistor is connected with the seventh pin of the flip-flop, the fifth pin of the flip-flop is connected with one end of the third capacitor, the second pin of the flip-flop, the gate of the second field effect transistor and one end of the eighth resistor are connected, the third pin of the flip-flop, one end of the fourth capacitor, the anode of the third diode and one end of the ninth resistor are connected, the other end of the fourth capacitor, the cathode of the third diode, the other end of the ninth resistor, the drain of the second field effect transistor, the other end of the second resistor and the gate of the first field effect transistor are connected, the other end of the eighth resistor, the other end of the fifth resistor, the anode of the fourth diode, the anode of the fifth diode and the anode of the sixth diode are connected, the cathode of the fourth diode is connected with the output end of the first operational amplifier, the negative input end of the first operational amplifier is connected with one end of the tenth resistor, the other end of the tenth resistor, one end of the sixteenth resistor and one end of the seventeenth resistor are connected, the positive input end of the first operational amplifier, the positive input end of the second operational amplifier and one end of the eleventh resistor are connected, the other end of the eleventh resistor, the other end of the sixth resistor, the first pin of the voltage stabilizing source, the second pin of the voltage stabilizing source and one end of the thirteenth resistor are connected, the negative input end of the second operational amplifier is connected with one end of the twelfth resistor, the output end of the second operational amplifier is connected with the negative electrode of the fifth diode, the other end of the twelfth resistor, one end of the eighteenth resistor and the emitter of the NPN tube, the negative input end of the third operational amplifier, the other end of the thirteenth resistor and one end of the fourteenth resistor are connected, the positive input end of the third operational amplifier, one end of the fifteenth resistor, the positive electrode of the second diode, one end of the fifth capacitor and the negative electrode of the first voltage stabilizing diode are connected, the output end of the third operational amplifier is connected with the negative electrode of the sixth diode, the positive input end of the fourth operational amplifier is connected with one end of the nineteenth resistor, and the negative input end of the fourth operational amplifier is connected with one end of the twentieth resistor, the other end of the twentieth resistor, the other end of the eighteenth resistor and one end of the twenty-first resistor are connected, the other end of the nineteenth resistor, one end of the twenty-second resistor, one end of the twenty-third resistor, the anode of the second zener diode and the anode of the third zener diode are connected, the other end of the twenty-third resistor is connected with the cathode of the light emitting diode, the drain of the first field effect transistor, the anode of the first diode, the other end of the third resistor, the other end of the seventeenth resistor, the other end of the fifteenth resistor, the other end of the fifth capacitor, the anode of the light emitting diode, the cathode of the second zener diode, the cathode of the third zener diode and the intrinsically safe output end are connected, the other end of the first capacitor, the other end of the second capacitor, the other end of the third capacitor, the first pin of the trigger, the other end of the sixteenth resistor, the third pin of the voltage regulator, the other end of the fourteenth resistor, the cathode of the first voltage regulator diode, the grounding end of the fourth operational amplifier, the other end of the twenty-first resistor and the other end of the twenty-second resistor are grounded.
2. The safety gate circuit as claimed in claim 1, further comprising an inductor and a seventh diode, wherein one end of the inductor, a cathode of the seventh diode, a drain of the first field effect transistor and an anode of the first diode are connected, and the other end of the inductor, an anode of the seventh diode, another end of the third resistor, another end of the seventeenth resistor, another end of the fifteenth resistor, another end of the fifth capacitor, an anode of the light emitting diode, a cathode of the second zener diode, a cathode of the third zener diode and the intrinsically safe output terminal are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582865.5A CN112701656A (en) | 2020-12-28 | 2020-12-28 | Guard grating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582865.5A CN112701656A (en) | 2020-12-28 | 2020-12-28 | Guard grating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112701656A true CN112701656A (en) | 2021-04-23 |
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ID=75511308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011582865.5A Pending CN112701656A (en) | 2020-12-28 | 2020-12-28 | Guard grating circuit |
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| Country | Link |
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| CN (1) | CN112701656A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060132061A1 (en) * | 2004-09-10 | 2006-06-22 | Color Kinetics Incorporated | Power control methods and apparatus for variable loads |
| CN101567549A (en) * | 2009-03-03 | 2009-10-28 | 四川神坤装备股份有限公司 | Direct-current safety gate |
| CN214543596U (en) * | 2020-12-28 | 2021-10-29 | 宁波长壁流体动力科技有限公司 | Guard grating circuit |
-
2020
- 2020-12-28 CN CN202011582865.5A patent/CN112701656A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060132061A1 (en) * | 2004-09-10 | 2006-06-22 | Color Kinetics Incorporated | Power control methods and apparatus for variable loads |
| CN101567549A (en) * | 2009-03-03 | 2009-10-28 | 四川神坤装备股份有限公司 | Direct-current safety gate |
| CN214543596U (en) * | 2020-12-28 | 2021-10-29 | 宁波长壁流体动力科技有限公司 | Guard grating circuit |
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