CN2041434U - Fully integrated automatic time controller - Google Patents
Fully integrated automatic time controller Download PDFInfo
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- CN2041434U CN2041434U CN 88209562 CN88209562U CN2041434U CN 2041434 U CN2041434 U CN 2041434U CN 88209562 CN88209562 CN 88209562 CN 88209562 U CN88209562 U CN 88209562U CN 2041434 U CN2041434 U CN 2041434U
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Abstract
The utility model relates to an electronic time control device of a software control mode, which is composed of a timing device and a display device of double-weeks twenty-four-hour system time combination, a novel PMOS/TTL port level converter and a time program address coder, a program storage body, an I/O control channel, peripheral two-value switches of each path or adjustable output control modules, etc., wherein, the timing device and the display device are novelly designed. The utility model has the characteristics of precise structure, high reliability, high precision, convenient operation, high degree of integration, long period of program control, convenient expansion, etc., and is suitable for the automatic time sequence control of industrial equipment, public electrical distribution and various electric appliances.
Description
The utility model belongs to automation control appliance able to programme, it is time reference with the absolute time mark, by the compiling of time address information,, connecing external unit is controlled automatically via follower by the access of static random memory realization user control program.
Existing Style Time Order Controller mainly contains two big classes, and the one, be based upon the sequential control on the hardware logic, the non-programmable control of user, the application scenario is single-minded, and function dullness, control timing change needs to revise hardwire; The secondth, the software programmable sequential control, this divides (1) industrial single chip microcomputer type timed unit again, use special-purpose single-chip microcomputer assembly language programming, need to use by the professional, and the cost height, complicated operation is used for lathe more, the control of commercial units such as electromechanics is not suitable for general requirement and family oriented and popularizes; (2) ordinary electronic time controller, by timer, code translator, display, memory, driver etc. are partly formed, but a little less than technology ubiquity 1. control abilities that occurred at present, the cycle is short, low precision, point able to programme is few, 2. apportion timer, time code translator, time display, circuit is numerous and diverse, and integrated degree is low, realizes complicated, cost up; 3. use a display driver segment signal directly to make program address information, redundance is big, and the memory utilization factor is low, and PMOS/TTL level shifting circuit complexity commonly used; 4. the driving to peripheral hardware is the contact control mode, and the life-span is short, and poor reliability, driving force are easily restricted; 5. the programming operation complexity is difficult for popular; 6. special digital clock IC joins the stand-alone program address counter, has the practical hidden danger of " control step-out " after the power down.
In view of above-mentioned existing technology existing problems, the purpose of this utility model is to do the novelty design at following aspects to improve with substantial renewal:
(1) time reference part (timer), the function and the time range (diaster) of increase timing and demonstration.
(2) program time address compilation sign indicating number device and level translator, address compression information improves the memory utilization factor.
(3) Renewal Design of programmed logic output follower and type of drive.
(4) change the relevant operation of the introducing control module of attitude CTRL signal with it.
These new design make on the whole and the utlity model has function/cost than high, Project Realization is simplified, fiduciary level improves, practical easy to operate, it is big to expand the leeway that upgrades, and control cycle is long, the precision height, energy-saving material-saving geometric ratio prior art each side all has the characteristics of essence innovation in various degree, the objective application requirements that is suitable for the universal automation program-controlled equipment.
Fully integrated automatic time program control device has 4 circuit boards to insert and has in the cabinet of front and back panels.The main circuit of 4 circuit boards has digital clock part (01) by six most of compositions, and indicator diaster (02), program module part (03) are comprising address compilation sign indicating number device, program module are arranged.I/O control and servo-actuated (04), power unit (05), element circuit (06) is comprising there being circuit A. CTRL to change attitude control signal, B. point second demonstration control, C. day carry pulse control circuit, and D. reports the ring circuit on schedule.On the front panel of cabinet, be equipped with: digital clock time display screen (1), functional select switch (3), two-way setting of time-division (4), light emitting diode (8), work indication (21) program switch (22), Manual Emergency Control (23), program write (24).On the rear panel of cabinet, be equipped with: first via accessory power outlet (25), the second road accessory power outlet (26); Third Road accessory power outlet (27), the four road accessory power outlet (28), sleep/timing accessory power outlet (29), first via voltage-regulation (30), protection power supply input (31).
Introduce the each several part circuit below in detail: digital clock part (01)
The key element of this part is a MK 50366N/PMOS large scale digital clock integrated package (2), is the encapsulation of 40 pin biserials, and four LED red light emitting diodes display screens digit time (1) adopt TOSHIBA-C, TVC-2-HB/AE.Clock integrated package (2) is connected with digital clock time display screen (1), and this part project installation is respectively at A, on the B plate as shown in Figure 1.
Indicator diaster (02): principle is referring to Fig. 2.Two 74LS74 are connected into the septenary counter of serial (5)
Count pulse (day carry pulse) is introduced by digital clock integrated package " PM " output terminal (38 pin).The 4th d type flip flop is connected into T ' triggered mode of operation, memory list/pair week.
Week code translator (6) is made of a slice 74LS138.Phase inverter (7) is made of 74LS04.y
0～y
6Respectively connect Sun. to display dot on Saturday, y
7Do (Zhou Jinwei) pulse of making zero in week, feed back to week counter (5) CLR end, and the upset pulse of double as list/pair all triggers.
Week, display used garden shape Tricolor LED (8) 2EF302 type, and the C end is cloudy altogether, and G and R end respectively meet y
0～y
6With y
0～y
6(Sun., the G end of position was directly put high level), display effect be current week the position glow, all the other in five week the position green light, Sun., the position sent out light orange.The high order end pilot lamp is bright/indication list/pair week respectively secretly.The day indicator project installation is respectively at A, on the C plate.
Program module part: (03)
1. address coding/decoding device (9) and level translator (10): in order to realize the synchronous operation accurately of digital clock and program reliably, for the purpose of general, directly draw a segment information from original digital clock integrated package pen section driving stage and change to change into through this address compiler and be module address information driver.This scheme has been removed special-purpose time-base generator, clock counter, code translator and driver from, use ready-made universal timepiece integrated package get final product the effect that plays the same tune on different musical instruments.Circuit not only succinctly but also reliable, had also thoroughly been avoided the problem of " step-out " simultaneously.With 47 segment encode information translation is the program body address information, is exactly the task of this address coder.
Fig. 3 is address compilation sign indicating number device logic schematic diagram.The effect of level translator (10) is the logic level that the pen section drive level of clock integrated package (2) PMOS is converted to the TTL circuit, realizes level match.Its single-wire circuit such as Fig. 4.
2. program module (12): coding result for make this device can be in two weeks per 5 minutes to be that a unit of program is implemented control and introduced 12 address wires altogether, so program module (12) is designed to 4K * 4W capacity.Use 4 M2114SRAM to be main memory, subsidiary a slice 74LS138 sheet selects code translator (11), adopts fully decoded mode in address to work, and its logic schematic diagram is seen Fig. 5.
74LS138 code translator (11) input end most significant digit scoops out anxious manual switch, and is selected or invalid to determine 4 M2114 sheet choosing end CS, thereby realizes manual control, has both function automatically.
Wherein program writes (24) and selects the read-write state of module (12) and the effect of 4 program switch (22) with Manual Emergency Control (23) switch.
I/O control and servo-actuated (04): 74LS244 impact damper (14) is the I/O device of two keys with 74LS373 latch (13) among Fig. 5.(14) four input ends of 244 impact dampers connect program switch (22) respectively, its function is a write device as program module (12) (when Manual Emergency Control (23), program write (24) and be " 0 "), the 2nd, and as manual switch (this moment, above-mentioned two switches were respectively " 1 " and " 0 ") in real time.Latch (13) is for three-state latchs door, when the CTRL invalidating signal output direct sample in input, when low level when effective, output keeps CTRL to jump along the eve state down no longer changing with input end, until
Till CTRL is elevated again.
Follower directly is sent in the output of latch (13).As Fig. 6, the contact of four relays (17) control bidirectional triode thyristor (19).This method with DC low current control alternating current large-power can compare effectively, realizes alternating current-direct current separating controlling and debugging safely.This installs four tunnel output designs and sees Fig. 7.Wherein the first via is connected into the AC voltage adjusting working method, can realize connecing consumer is carried out light modulation/temperature adjustment/operations such as speed governing, is applicable to the programmed control of housed devices such as electric fan, electric heater, electric iron, electric meal kitchen range, electric light.Simultaneously, first and second road just also is being provided with/negative logic selector switch (18).In general, positive logic control is applicable to the program control of normal pass electrical equipment, and negative logic is just in time opposite, notes, when using the negative logic programming, work indication (21) is bright for stopping, and secretly is work.
In addition, in third and fourth road output of time controller, be provided with the selection of " alternating voltage/dc switch " (20).When using " alternating voltage ", the second tunnel positive logic mode roughly the same; A.B.C three utmost points of drawing from three core sockets when using " dc switch " are respectively moving plate and normally closed/normally opened contact, can be used for controlling direct current (or little interchange) circuit.
Figure 8 shows that the five tunnel special-purpose sleep/timing output, it can control the time of electrical appliance delay working in nearest 59 minutes.The relay that connect from sleep end shown in Figure 1 (21 pin) of gauge tap wherein.
The phantom element project installation is at the D plate.
Power unit (05):
As Fig. 9, this device complete machine has three kinds of distribution voltage power supplys.Vcc1, for+9V, partly use for clock; Vcc
2For+5V, use for the TTL logical gate.Vcc
3For+4.5V, be the power-off protection power supply, use for static routine module (M2114).
Being connected on the secondary RC circuit of power transformer is 50Hz vibration sample circuit, disjunction mark standard when being made for digital clock.Because of MK50366 clock integrated package (2) inside is provided with 50Hz frequency stabilization and shaping circuit, so this time base of taking from power frequency has higher precision, be not subject to the power network fluctuation influence, day error was less than ± 1 second.
LM7805 is fixedly integrated voltage stabilizers of three ends, and is easy to use, reliable, provides complete machine TTL logic working voltage by it.D1 oppositely irritates current protection diode, C
2, C
3Be used to prevent the IC self-excitation, D
2, D
3Be directed steering diode, for RAM provides uninterrupted power source.This part project installation is at the D plate.
Element circuit: (06)
A. CTRL changes the attitude control signal: because the program address of this device is directly from a segment signal of digital clock display screen (1), and as MK50366 clock integrated package (2) the public display screen of adapted a slice of multi-functional selection, promptly when using other function of digital clock (as showing second, calendar shows) time, pen section set on the screen will not be required program address information, thus the output that can lead to errors control.For preventing this " step-out " problem, need change the current time at clock and in time keep output information at that time, show state when recovering current again during show state.So introduced the CTRL condition indicative signal.
The CTRL signal is taken from panel feature selector switch (3), promptly use the dpdt double-pole double-throw (DPDT) toggle switch to form the preferential chain type circuit of serial, when the selector switch that changes the attitude function is closed, CTRL is that low level is effectively exported, have only when every other functional select switch is all invalid and (be the current time demonstration), CTRL just is elevated into invalid, as shown in figure 10.
B. second point shows control (1Hz oscillator): not having a second some show pen section because MK50366 clock integrated package (2) is inner, is to strengthen the dynamic effect that shows, this timed unit has been introduced 1HZ and put display control circuit second.When the normal current time showed, two seconds points were done the flicker in 1 second cycle screen on, no longer were the two point flicker when function shows on the screen when changing attitude, but list was lighted apparently in following second especially, as displaying calendar, was " 10.21 ", or the like.
This element circuit is seen Figure 11, and two not gates in below constitute multi resonant astable oscillator (32), and four Sheffer stroke gates in top are a second dotted state steering logic (33).Project installation is at the B plate.
C. day carry pulse control circuit:
MK50366 clock integrated package (2) only has the PM display end, when PM give during by " 1 " to " 0 " saltus step (5) one day of counter week carry pulse.As shown in figure 12.
Because week counter (5) carry pulse derives from a segment signal of LED digital clock time display screen (1), so apparently may introduce false triggering when changing attitude when shielding.Be 2:00 in afternoon when current, promptly screen shows for " 2:00 " if user's this moment has selected a second display function, changes on the screen " .21 ", and PM point in upper left side " 0 " by " 1 " change, if carry pulse is directly got this PM point, has just produced undoubtedly and has once missed carry.For this reason, this time controller has been set up this day carry pulse control circuit, to eliminate this phenomenon.
Pushbutton switch is done week and is transferred soon among Figure 12.This part project installation is at the B plate.
D. report the ring circuit on schedule: see Figure 13.Use a slice integrated music sheet (34) CW9300 can make digital clock increase music newspaper ring function on schedule, be convenient to actual use.The SW end that experiment showed, CW9300 integrated music sheet (34) can be played out the internal memory music one time when receiving a high level pulse after, directly promote piezo or through single tube amplify back promotion loudspeaker send loud melody report toot.
As clock on schedule feature be that ten of branches are by " 5 " saltus step to " 0 ".This moment b
2By 0 change 1, and in more becoming, all the other numerals do not have this feature again, so draw newspaper toot trigger pip on schedule by it.RC is b among Figure 13
2The level differentiating circuit only triggers once each saltus step.When entering when changing attitude, no longer be current time on the screen so the time should cancel b
2Do the effect of triggering level on schedule, diode D is used to finish this function.
This apparatus function is complete, novel structure, integrated degree height uses the time control of equipment such as flexible, reliable, as can be widely used in commercial unit control, factories and miness, school, enterprises and institutions' institutional settings broadcasting, electric bell, street lamp, power window and the work management of household electrical appliance.
The utility model has following accompanying drawing.
Figure 0, circuit block diagram.
Fig. 1. digital clock part schematic diagram.
Fig. 2. diaster counter and display logic figure.
Fig. 3. address compilation sign indicating number device logical diagram.
Fig. 4. level translator.
Fig. 5. program module logical diagram.
Fig. 6. four tunnel output followers.
Fig. 7. four distance controls output is provided with.
Fig. 8. sleep/timing output mouth.
Fig. 9. the complete machine power supply diagram.
Figure 10. the CTRL control signal generation circuit.
Figure 11. second some vibration and control circuit logical diagram.
Figure 12. day carry pulse control and fast demodulation circuit of week.
Figure 13. report toot circuit diagram on schedule.
Figure 14. front panel figure
Figure 15. rear panel figure.
Number in the figure is as follows:
01. digital clock part.02. diaster indicator.
03. program module part 04.I/O control and phantom element
05. power unit 06. element circuit part
1. digital clock time display screen
2. clock integrated package (MK50366N)
Functional select switch (as shown in figure 14 from left to right, switching function be current time school, universal time school and demonstration, when making a noise/timing school and demonstration, demonstration second.Sleep school and demonstration.Calendar school and demonstration).
4. the time/minute two-way setting (as shown in figure 14, arrange down from left to right that function has a branchs position, divide ten, the time position, week the school, when making a noise/regularly, last row left 4 resets, left 5 cancel sleep).
5. counter (74LS74)
6. code translator (74LS138)
7. phase inverter (74LS04)
8. light emitting diode (2EF302)
9. address compilation sign indicating number device
10. level translator
11. code translator (74LS138)
12. program module (2114)
13. latch (74LS373)
14. impact damper (74LS244)
15. triode (9013)
16. light emitting diode
17. relay (4100)
18. just/the negative logic selector switch
19. bidirectional triode thyristor
20. alternating voltage/dc switch
21. work indication
22. program switch
23. Manual Emergency Control
24. program writes
25. first via accessory power outlet
26. the second road accessory power outlet
27. Third Road accessory power outlet
28. the four road accessory power outlet
29. sleep/timing accessory power outlet
30. first via voltage-regulation
31. protection power supply input
32. multi resonant astable oscillator
33. second dotted state steering logic
34. integrated music sheet (CW9300)
The concrete enforcement of this device is as follows:
Installed module is in proper order: 1. power panel, 2. digital clock, (master clock circuit and display part), 3. diaster indicator, 4. a second some vibration reaches whistling device on schedule with logic controller, 5. day carry control section, 6. address compilation sign indicating number device and main memory accumulation body, 7. I/O control gate and program switch, 8. I/O output phantom element.
In general, because this time controller is integrated, the degree of modularity is higher, each side designs all through testing repeatedly and adjusting, so only need element qualified, install errorlessly, debugging work meeting is simple with smoothly, below some making problems that only just may occur do a little analyses:
A) power unit: see Fig. 9, C
2, C
3Be weakening electric capacity,, should check the welding of two electric capacity therewith of its quality if 7805 output voltage deviations occur greater than ± 5%.
B) digital clock part: should show 12:00 after powering on, when making a noise, universal time also all the 12:00 calendar be 12.31, second showing is 00, when beginning to walk behind the button when pressing arbitrary school.If screen field is disorderly and unsystematic, answer On line inspection power source voltage Vcc 1, whether low (＜7.5V) if whether base RC imports and connects can check 30 pin can not normally walk the time time. with excessivelying
C) diaster indicator: feed a positive pulse, should move to left in week one, to Saturday, directly jump into Sun..If jumping has appearred in the centre, should check the Y of 74LS138 week code translator (6)
7Whether end connects, if pulsatile once produces a plurality of jumping lattice, should check C
2
D) second some vibration and logic control part:, regulate R as Figure 11
2, make oscillator produce stable second of 1Hz and dodge, and with the R that sealed with wax
2The CTRL end is put O, had only following second to light (not dodging), it is put 1, the two point flicker.
E) day carry control: major clock is changed to " 12:00 ", alarm time is changed to " 12:00 " and is introduced into and shows that Q point be a low level when current, the noisy display switch of closure, and " PM " lights on the screen, and Q should remain low level.In like manner two kinds of times are inverted, are shown as when current, Q is a high level, the closed display switch that makes a noise, " PM " goes out on the screen, Q still should be height, repetition test repeatedly, Q should not have saltus step.Otherwise just should check wiring and RC decay part.
F) I/O control gate, program switch, address compilation sign indicating number device and main memory accumulation body part.
This part is the core and key of complete machine.The first step is earlier used week fast school button with clock portion tap electricity when not entering away (but), respectively Sun., one, two ... six write 0000,0001,0010,0100,1000,1001,1111, later read successively again, contrast week shows, look at whether consistent, if deviation should be checked address wire A
9, A
10, A
11Second step, fix one week the position with divide ten and a position, enter when current " set up ", use " time " fast school, position button by the time by the morning 12:00 begin to walk 12 hours, write corresponding binary code respectively, promptly 0001,0010,0011 ... again since afternoon 12:00 walk 12 hours, write its binary code with opposite sequence, ultimate check one time, if wrong, should check A
1, A
2, A
6, A
7, A
8The 3rd step, the same method, fixedly week the position with hour position, check " branch " two, verification A
0, A
3, A
4With A
5Errorless until whole read/write unanimities, can finish this part debugging.
G) I/O output and servo-actuated: as Fig. 6, add voltage about 2V at input end, relay is adhesive reliably, and light emitting diode is lighted simultaneously.After voltage was reduced to 0.5V, relay should be by discharging.
Use for example:
Now with a school, four kinds of electrical equipment one all programs are controlled to be the function of this time controller of example explanation, usage.
The △ customer requirements:
1) break the tinkle of bells control: from Monday to Saturday, every morning is at 7:30,8:15,8:30,9:15,9:45,10:30,10:45,11:30 output high level triggers bell ring equipment and sends upper and lower eod signal.Equally from Mon-Fri 2:00 every afternoon, 2:45,3:00,3:45 exports ringing signal.High level was kept 5 minutes, triggered with rising edge.
2) campus broadcasting equipment: every morning 7:00 relays Central People's Broadcasting Station's " news and abstract of the newspaper program " by Monday to Saturday, shuts down after half an hour.Play " doing setting-up exercises to radio music " program at 9:25～9:40 then, 10:45-10:55 plays " doing eye exercises " music.
3) classroom building illumination equipment: every day, night, 6:30 reinstated, and turned off the light until 10:30.Then being extended down to 11:30 Saturday turns off the light.
4) audio-visual education programme classroom audio-visual equipment distribution control: on every Mondays, three, five afternoons the 3:00～open foreign language audition that provides of 4:00; On every Tuesdays, the open teaching recorded program of playing of four, six late 7:00～9:00, the morning on Sun. 9:00～11:00, afternoon 2:00～open literature and art, the entertainment play of 4:00.
△ program composition and use:
This installs the program control point that has more than 2,000 inequality in one week of every road peripheral hardware, and tens of at most used inequality points ability in the above-mentioned example." customer requirements " is with the other write-in program module of above-mentioned open/close state part in view of the above.Faculty and staff members just needn't take into account facilities such as electric bell, distribution, broadcasting everyday in the time from now on like this, they all will automatically carry out work by school's regulation under time controller control, this has just improved management work efficiency and fiduciary level significantly, and higher utility and universal meaning are arranged.
Claims (7)
1, fully integrated automatic time control device uses three kinds of distribution voltage power supplys, it is characterized in that: this device has 4 circuit boards insertions to have in the cabinet of front and back panels, its main circuit has digital clock part (01), indicator diaster (02), program module part (03), and I/O control is formed with servo-actuated (04), element circuit (06) part.
2; device according to claim 1; it is characterized in that: digital clock display screen (1) is housed on the front panel of cabinet; functional select switch (3); two-way setting of time-division (4); light emitting diode (8); work indication (21); program switch (22); Manual Emergency Control (23); program writes (24), and first via accessory power outlet (25) the second road accessory power outlets (26) are housed on the cabinet rear panel; Third Road accessory power outlet (27); the four road accessory power outlet (28); sleep/timing accessory power outlet (29); first via voltage-regulation (30); protection power supply input (31).
3, device according to claim 1 and 2 is characterized in that: digital clock part (01), by large scale digital clock integrated package (2) linking number word time display screen (1) is installed on the circuit board respectively.
4, device according to claim 1 and 2, it is characterized in that: indicator diaster (02), be connected into the septenary counter of serial (5) by two 74LS74, use count pulse, memory list/pair week, week code translator (6) is made of a slice 74LS138 and phase inverter (7), week display, use Tricolor LED (8) in order to show luminous position of week.
5, device according to claim 3, it is characterized in that: program module part (03), middle address compilation sign indicating number device comprises level translator (10), 4 2114 integrated circuit blocks of program module (12) use and a slice code translator (11) are realized full address decoding, code translator (11) input end most significant digit connects the chip selection signal of " manual/automatic " switch generating routine module (12), and program module (12) is for depositing user program in.
6, according to claim 1 or 2 or 5 described devices, it is characterized in that: I/O control is Primary Component by impact damper (14) with latch (13) with servo-actuated (04), impact damper (14) input end connects program switch (22) respectively, realization writing and importing as manual control in real time program module (12), follower directly is sent in the output of latch (13), by the contact control bidirectional triode thyristor (19) of relay (17).First and second road in four tunnel outputs just is being provided with/negative logic selector switch (18), and third and fourth road is provided with the selection of " alternating voltage/dc switch " (20), and the five the tunnel has special-purpose sleep/timing accessory power outlet (29).
7, device according to claim 4, it is characterized in that: element circuit (06) part, include A. CTRL and change the attitude control signal, B. a second point shows control, C, day carry pulse control, D. newspaper ring circuit constitutes on schedule, CTRL changes the attitude control signal and takes from panel feature selector switch (3), CTRL is that low level is effective, high level is invalid, prevent error message output, second some display control circuit is made up of point control logic second (33) of multi resonant astable oscillator (32) and four Sheffer stroke gate formations, in order to strengthen the dynamic effect that shows, day, the carry pulse control circuit was in order to prevent false triggering, newspaper ring circuit uses integrated music sheet (34) on schedule, makes this device increase music newspaper ring function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209562 CN2041434U (en) | 1988-08-16 | 1988-08-16 | Fully integrated automatic time controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209562 CN2041434U (en) | 1988-08-16 | 1988-08-16 | Fully integrated automatic time controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2041434U true CN2041434U (en) | 1989-07-19 |
Family
ID=4843185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88209562 Withdrawn CN2041434U (en) | 1988-08-16 | 1988-08-16 | Fully integrated automatic time controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2041434U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444670A (en) * | 2016-09-30 | 2017-02-22 | 桂林电子科技大学信息科技学院 | Remote electric-energy saving control system of teaching buildings |
| CN110363942A (en) * | 2019-07-19 | 2019-10-22 | 刘天欣 | A kind of optical fiber luminescent alarming device |
| CN114220405A (en) * | 2021-12-15 | 2022-03-22 | 惠州视维新技术有限公司 | Level conversion circuit, power supply integrated circuit, display device, and level conversion method |
-
1988
- 1988-08-16 CN CN 88209562 patent/CN2041434U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444670A (en) * | 2016-09-30 | 2017-02-22 | 桂林电子科技大学信息科技学院 | Remote electric-energy saving control system of teaching buildings |
| CN110363942A (en) * | 2019-07-19 | 2019-10-22 | 刘天欣 | A kind of optical fiber luminescent alarming device |
| CN114220405A (en) * | 2021-12-15 | 2022-03-22 | 惠州视维新技术有限公司 | Level conversion circuit, power supply integrated circuit, display device, and level conversion method |
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