CN204465399U - PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit - Google Patents
PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit Download PDFInfo
- Publication number
- CN204465399U CN204465399U CN201520006413.0U CN201520006413U CN204465399U CN 204465399 U CN204465399 U CN 204465399U CN 201520006413 U CN201520006413 U CN 201520006413U CN 204465399 U CN204465399 U CN 204465399U
- Authority
- CN
- China
- Prior art keywords
- pwm pulse
- modulation signal
- control unit
- wide modulation
- pulse wide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The utility model discloses a kind of PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit, comprise MCU control unit, diagnostic trouble code feedback control unit, PWM pulse wide modulation signal gathering unit and PWM pulse wide modulation signal input unit, described MCU control unit is provided with two or more inputs, output port, comprise B1 port and B3 port, described diagnostic trouble code feedback control unit is connected with the B1 port in MCU control unit, described PWM pulse wide modulation signal gathering unit is connected with the B3 port in MCU control unit, described diagnostic trouble code feedback control unit is also connected with PWM pulse wide modulation signal input unit after being connected with PWM pulse wide modulation signal gathering unit.The utility model is installed in automobile speed regulating cellular system, and impel MCU control unit two output port coordinations, automobile primary Ore-controlling Role just can judge motor speed regulation system fault type.
Description
Technical field
The utility model relates to the field of automotive electronics governing system, particularly relates to PWM speed-regulating signal in a kind of automotive electronics speed governing given with diagnostic trouble code feedback circuit, is installed in automobile speed regulating cellular system.
Background technology
In automotive electronics governing system, often run into automobile primary Ore-controlling Role and send PWM pulse wide modulation signal, this signal sends with PWM pulse duty cycle square, PWM pulse duty cycle signal contains the rotary speed information of controlled unit, under the prerequisite that automobile level voltage is certain, PWM pulse duty cycle signal and rotating speed proportional, that is: n=U × Euro.
Wherein:
N: speed governing object DC motor speed;
U: automobile storage battery battery voltage;
Euro: PWM pulse duty cycle.
Euro external manifestation of PWM pulse duty cycle signal is that pulse square wave form occurs, therefore duty ratio performance element is according to PWM pulse wide modulation signal, receive this signal, after computed duty cycle and this signal frequency, drive automotive electronics governing system performance element action direct current machine to rotate through process, thus reach rotational speed regulation effect.
Therefore need to possess following two aspect abilities in actuator's electronic control system.How one: in automotive electronics governing system performance element, receive this PWM pulse duty cycle pulse signal; Its two: automotive electronics governing system performance element faults itself signal feedback is to automobile primary Ore-controlling Role.
Utility model content
It is given with diagnostic trouble code feedback circuit that the technical problem that the utility model mainly solves is to provide PWM speed-regulating signal in a kind of automotive electronics speed governing, be installed in automobile speed regulating cellular system, take MCU control unit as core devices, adopt pulse capture, triggering mode realizes comprising speed governing content voltage rectangular ripple signal capabilities, PWM speed-regulating signal is given simultaneously possesses certain coordination ability with diagnostic trouble code feedback circuit, impel MCU control unit two output port coordinations, an output port inputs as control signal, output control terminal, control signal inputs, output characteristic and fault feedback signal path, another input port is as PWM pulse wide modulation signal input channel, and automobile primary Ore-controlling Role just can judge motor speed regulation system fault type.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit, comprise MCU control unit, diagnostic trouble code feedback control unit, PWM pulse wide modulation signal gathering unit and PWM pulse wide modulation signal input unit, described MCU control unit is provided with two or more inputs, output port, comprise B1 port and B3 port, described diagnostic trouble code feedback control unit is connected with the B1 port in MCU control unit, described PWM pulse wide modulation signal gathering unit is connected with the B3 port in MCU control unit, described diagnostic trouble code feedback control unit is also connected with PWM pulse wide modulation signal input unit after being connected with PWM pulse wide modulation signal gathering unit.
In the utility model preferred embodiment, described diagnostic trouble code feedback control unit comprises the first resistance, 4th resistance, 6th resistance, 7th resistance and triode, described triode comprises collector electrode, emitter and base stage, the emitter of triode carries out grounding connection, the first described resistance and the 4th resistance are connected to the two ends, left and right of transistor collector, the 6th described resistance is connected between B1 port in MCU control unit and the base stage of triode, be connected with the 6th resistor coupled in parallel after the 7th described resistance is connected with the 4th resistance, B1 port in MCU control unit controls triode ON and closedown by the 6th resistance.
In the utility model preferred embodiment, when the B1 port in described MCU control unit exports high level, the base stage conducting of triode, automobile storage battery power supply makes saturation conduction between the collector electrode of triode and emitter by the 4th resistance;
In the utility model preferred embodiment, during B1 port output low level in described MCU control unit, the base stage cut-off of triode, ends between the collector electrode of triode and emitter.
In the utility model preferred embodiment, described PWM pulse wide modulation signal gathering unit comprises the second resistance, the 3rd resistance and the second electric capacity, the second described resistance is connected with the first resistance in diagnostic trouble code feedback control unit with the B3 port in MCU control unit respectively, carry out grounding connection again after the 3rd described resistance is connected with the second resistor coupled in parallel, the second described electric capacity is connected with the 3rd resistor coupled in parallel.
In the utility model preferred embodiment, described PWM pulse wide modulation signal input unit comprises the PWM pulse wide modulation signal and the first electric capacity that automobile primary Ore-controlling Role sends, carry out grounding connection again after the first described electric capacity and PWM pulse wide modulation signal are connected in parallel, described PWM pulse wide modulation signal falls to exchange after noise signal through the first capacitive filter and exports PWM pulse wide modulation signal.
In the utility model preferred embodiment, when described PWM pulse wide modulation signal is high level, the B1 port output low level of MCU control unit, impels triode to end, and B3 port receives the high voltage square wave signal in 5V voltage range.
In the utility model preferred embodiment, when described PWM pulse wide modulation signal is low level, the B1 port of MCU control unit exports high level, impel triode ON, automobile storage battery power supply makes saturation conduction between the collector electrode of triode and emitter by the 4th resistance, and the B3 port accepts of MCU control unit is to low-voltage square wave signal.
The beneficial effects of the utility model are: PWM pulse wide modulation signal feeding of the present utility model and diagnostic trouble code feedback circuit, be installed in automobile speed regulating cellular system, take MCU control unit as core devices, adopt pulse capture, triggering mode realizes comprising speed governing content voltage rectangular ripple signal capabilities, PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit possess certain coordination ability simultaneously, impel MCU control unit two input, output port coordination, an input, output port is as control signal input control end, control signal inputs, output characteristic and fault feedback signal path, another output port is as PWM pulse wide modulation signal input channel, and automobile primary Ore-controlling Role just can judge motor speed regulation system fault type.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, wherein:
Fig. 1 is the circuit diagram of a preferred embodiment of the utility model PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit;
Fig. 2 is the circuit diagram of diagnostic trouble code feedback control unit in Fig. 1;
Fig. 3 is the circuit diagram of PWM pulse wide modulation signal gathering unit in Fig. 1;
Fig. 4 is the circuit diagram of PWM pulse wide modulation signal input unit in Fig. 1.
Embodiment
Be clearly and completely described to the technical scheme in the utility model embodiment below, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the utility model embodiment comprises:
A kind of PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit, be installed in automobile speed regulating cellular system, comprise MCU control unit, diagnostic trouble code feedback control unit, PWM pulse wide modulation signal gathering unit and PWM pulse wide modulation signal input unit, described MCU control unit is provided with two or more inputs, output port, comprise B1 port and B3 port, described diagnostic trouble code feedback control unit is connected with the B1 port in MCU control unit, described PWM pulse wide modulation signal gathering unit is connected with the B3 port in MCU control unit, described diagnostic trouble code feedback control unit is also connected with PWM pulse wide modulation signal input unit after being connected with PWM pulse wide modulation signal gathering unit.Wherein, described MCU control unit adopts a MCU microcontroller.
As shown in Figure 2, described diagnostic trouble code feedback control unit comprises the first resistance R1, 4th resistance R4, 6th resistance R6, 7th resistance R7 and triode Q1, described triode Q1 comprises collector electrode, emitter and base stage, the emitter of triode Q1 carries out grounding connection, the first described resistance R1 and the 4th resistance R4 is connected to the two ends, left and right of triode Q1 collector electrode, the 6th described resistance R6 is connected between B1 port in MCU control unit and the base stage of triode Q1, be connected in parallel with the 6th resistance R6 after the 7th described resistance R7 is connected with the 4th resistance R4, B1 port in MCU control unit controls triode Q1 conducting and closedown by the 6th resistance R6.
As shown in Figure 3, described PWM pulse wide modulation signal gathering unit comprises the second resistance R2, the 3rd resistance R3 and the second electric capacity C2, the second described resistance R2 is connected with the first resistance R1 in diagnostic trouble code feedback control unit with the B3 port in MCU control unit respectively, carry out grounding connection again after the 3rd described resistance R3 and the second resistance R2 is connected in parallel, the second described electric capacity C2 and the 3rd resistance R3 is connected in parallel.
As shown in Figure 4, described pwm pulse input unit comprises the PWM pulse wide modulation signal and the first electric capacity C1 that automobile primary Ore-controlling Role sends, carry out grounding connection again after the first described electric capacity C1 and PWM pulse wide modulation signal are connected in parallel, described PWM pulse wide modulation signal filters out after interchange noise signal through the first electric capacity C1 and exports PWM pulse wide modulation signal.
Wherein, it is a kind of pulse square wave signal comprising certain frequency and duty ratio that automobile primary Ore-controlling Role sends PWM pulse wide modulation signal, and this signal has following several characteristic:
1, PWM pulse wide modulation signal dutyfactor is change, and frequency can be fixed, and also can change;
2, PWM pulse wide modulation signal occurs with Pulse High Voltage signal form.
Because MCU control unit has two or more inputs, output port B1 and B3, B1 port by the 6th resistance R6 control triode Q1 ground level, thus the conducting of control triode Q1 and closedown, its function is as follows:
1, when the speed adjustment unit controlled when automobile primary Ore-controlling Role normally works, the B1 port of MCU control unit and the co-ordination of B3 port, when PWM pulse wide modulation signal is high level, automobile storage battery voltage is sent out the PWM pulse wide modulation signal that automobile primary Ore-controlling Role sends over large to the voltage square wave signal of amplitude within 0V to 5V scope by the 4th resistance R4, the first resistance R1, the second resistance R2 and the 3rd resistance R3 network.
When PWM pulse wide modulation signal is high level, the B1 port output low level of MCU control unit, impel triode Q1 to end, B3 port can receive the high voltage square wave signal in 5V voltage range; When PWM pulse wide modulation signal is low level, the B1 port of MCU control unit exports high level, impel triode Q1 conducting, clamped at 0V for A point voltage in circuit, cause the B3 port accepts of MCU control unit to low-voltage square wave signal, frequency and the duty ratio of the frequency of this voltage square wave signal and duty ratio and the PWM pulse wide modulation signal that automobile primary Ore-controlling Role sends over are consistent.
2, when the speed adjustment unit controlled when automobile primary Ore-controlling Role detects fault, the B3 port of MCU control unit quits work, now the B1 port interval special time of MCU control unit exports high and low signal, the Q1 conducting of specified time interval trigger triode and cut-off, being transported to automobile primary Ore-controlling Role by the first resistance R1, the 4th resistance R4, the 6th resistance R6 and the 7th resistance R7 composition networking sends on PWM pulse wide modulation holding wire, inform automobile primary Ore-controlling Role, speed adjustment unit breaks down.
Further, when the B1 port of MCU control unit exports high level, the conducting of triode Q1 base stage, automobile storage battery power supply makes saturation conduction between the collector electrode of triode Q1 and emitter by resistance R4, makes A point current potential in circuit be limited in the low level of about 0V; During output port B1 output low level, triode Q1 base stage is ended, and ends, make A point current potential in circuit be limited in the high level of about 5V between the collector electrode of triode Q1 and emitter.
In above-mentioned, the first described resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 6th resistance R6, the 7th resistance R7 resistance are within 1k ohm to 10k ohm scope, and the first resistance R1, the 4th resistance R4 and the second resistance R2 resistance sum are more than or equal to the escort services of the 3rd resistance R3 resistance.First electric capacity C1 is High frequency filter function, its value size is between 100nF (farad)-1000 nF (farad), second electric capacity C2 is low frequency filtering function, and its value size is between 100 μ F (farad)-1000 μ F (farad).
The given operation principle with diagnostic trouble code feedback circuit of PWM speed-regulating signal in automotive electronics speed governing of the present utility model:
Step 1: the work such as inner related register, timer, port initialization are set by the MCU control unit of speed adjustment unit, the input of B1 port, output function are set, B3 port is arranged to pulse flutter and catch function, rising edge and trailing edge down trigger counting, time delay;
Step 2: automobile primary Ore-controlling Role works, send PWM pulse wide modulation signal, by the B3 port accepts in the MCU control unit of speed governing object to (high level arrival) during a rising edge signal, MCU control unit makes B1 port output low level, and keeps this state, and triode Q1 is ended, in circuit, A point current potential remains high voltage signal state, impel the B3 port accepts of MCU control unit to high voltage square wave signal, timer count, regularly, the duration is designated as T1;
Step 3: when by the B3 port accepts in the MCU control unit of speed governing object to (low level arrival) during a trailing edge signal, MCU control unit makes B1 port export high level, and keep this state, make triode Q1 conducting, in circuit, A point current potential remains low voltage signal state, impel the B3 port accepts of MCU control unit to low-voltage square wave signal, timer count, regularly, the duration is designated as T2;
Step 4:MCU control unit calculates PWM pulse wide modulation signal period T, T=T1+T2; Calculate PWM pulse wide modulation signal frequency p, p=1/T; Calculate PWM pulse wide modulation signal dutyfactor Euro, Euro=T1/T.Under this duty ratio Euro constant prerequisite comprising debug signal of maintenance, frequency multiplication driving power pipe switching frequency, thus control speed adjustment unit DC motor speed;
Step 5: when MCU control unit detects motor or self fault, fault message is needed to feed back to automobile primary Ore-controlling Role, now MCU control unit closes B3 port, stop receiving PWM pulse wide modulation signal, when B1 port exports a lasting special time high level, make triode Q1 saturation conduction, A electricity in circuit is embedded in about 0V, PWM pulse wide modulation holding wire continues to occur low level signal; When B1 port exports a lasting special time low level signal, PWM pulse wide modulation holding wire continues to occur high level signal; Make automobile primary Ore-controlling Role monitor this and continue high and low level signal time length, this PWM pulse wide modulation signal continues the lasting high and low level signal occurring that special time does not wait, automobile primary Ore-controlling Role just can judge motor speed regulation system fault type.This continues high and low level signal special time and represents different fault types, shown in particular content following table 1:
Table 1: fault type table
。
In automotive electronics speed governing, PWM pulse width signal is given needs to possess following functions with diagnostic trouble code feedback circuit:
1, circuit can receive this PWM pulse wide modulation signal capabilities;
2, circuit adopts the network configurations such as resistance, electric capacity, triode, PWM pulse wide modulation signal is amplified, become voltage rectangular waveshape within voltage magnitude 5V and be transported to the port of micro control unit MCU microcontroller, frequency, the duty ratio of this voltage rectangular wave frequency, duty ratio and PWM pulse wide modulation signal are consistent;
3, circuit is with MCU microcontroller for core devices, adopts pulse capture, triggering mode to realize comprising speed governing content voltage rectangular ripple signal capabilities;
4, with MCU microcontroller for core devices circuit, possess the duty ratio of calculating voltage square-wave signal, the ability of frequency;
5, with MCU microcontroller for core devices circuit possesses certain coordination ability, impel two output port coordinations of MCU microcontroller, an output port as control signal input control end, control signal input, output characteristic and fault feedback signal path; Another output port is as pwm signal input channel.
In sum, PWM pulse wide modulation signal feeding of the present utility model and diagnostic trouble code feedback circuit, be installed in automobile speed regulating cellular system, take MCU control unit as core devices, adopt pulse capture, triggering mode realizes comprising speed governing content voltage rectangular ripple signal capabilities, PWM speed-regulating signal is given simultaneously possesses certain coordination ability with diagnostic trouble code feedback circuit, impel MCU control unit two input, output port coordination, an input, output port is as control signal input control end, control signal inputs, output characteristic and fault feedback signal path, another output port is as PWM pulse wide modulation signal input channel, and automobile primary Ore-controlling Role just can judge motor speed regulation system fault type.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model description to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. a PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit, it is characterized in that, comprise MCU control unit, diagnostic trouble code feedback control unit, PWM pulse wide modulation signal gathering unit and PWM pulse wide modulation signal input unit, described MCU control unit is provided with two or more inputs, output port, comprise B1 port and B3 port, described diagnostic trouble code feedback control unit is connected with the B1 port in MCU control unit, described PWM pulse wide modulation signal gathering unit is connected with the B3 port in MCU control unit, described diagnostic trouble code feedback control unit is also connected with PWM pulse wide modulation signal input unit after being connected with PWM pulse wide modulation signal gathering unit.
2. PWM pulse wide modulation signal feeding according to claim 1 and diagnostic trouble code feedback circuit, it is characterized in that, described diagnostic trouble code feedback control unit comprises the first resistance, 4th resistance, 6th resistance, 7th resistance and triode, described triode comprises collector electrode, emitter and base stage, the emitter of triode carries out grounding connection, the first described resistance and the 4th resistance are connected to the two ends, left and right of transistor collector, the 6th described resistance is connected between B1 port in MCU control unit and the base stage of triode, be connected with the 6th resistor coupled in parallel after the 7th described resistance is connected with the 4th resistance, B1 port in MCU control unit controls triode ON and closedown by the 6th resistance.
3. PWM pulse wide modulation signal feeding according to claim 2 and diagnostic trouble code feedback circuit, it is characterized in that, when B1 port in described MCU control unit exports high level, the base stage conducting of triode, automobile storage battery power supply makes saturation conduction between the collector electrode of triode and emitter by the 4th resistance.
4. PWM pulse wide modulation signal feeding according to claim 2 and diagnostic trouble code feedback circuit, is characterized in that, during B1 port output low level in described MCU control unit, the base stage cut-off of triode, ends between the collector electrode of triode and emitter.
5. PWM pulse wide modulation signal feeding according to claim 2 and diagnostic trouble code feedback circuit, it is characterized in that, described PWM pulse wide modulation signal gathering unit comprises the second resistance, the 3rd resistance and the second electric capacity, the second described resistance is connected with the first resistance in diagnostic trouble code feedback control unit with the B3 port in MCU control unit respectively, carry out grounding connection again after the 3rd described resistance is connected with the second resistor coupled in parallel, the second described electric capacity is connected with the 3rd resistor coupled in parallel.
6. PWM pulse wide modulation signal feeding according to claim 1 and diagnostic trouble code feedback circuit, it is characterized in that, described PWM pulse wide modulation signal input unit comprises the PWM pulse wide modulation signal and the first electric capacity that automobile primary Ore-controlling Role sends, carry out grounding connection again after the first described electric capacity and PWM pulse wide modulation signal are connected in parallel, described PWM pulse wide modulation signal falls to exchange after noise signal through the first capacitive filter and exports PWM pulse wide modulation signal.
7. the PWM pulse wide modulation signal feeding according to claim 2 or 6 and diagnostic trouble code feedback circuit, it is characterized in that, when described PWM pulse wide modulation signal is high level, the B1 port output low level of MCU control unit, impel triode to end, B3 port receives the high voltage square wave signal in 5V voltage range.
8. the PWM pulse wide modulation signal feeding according to claim 2 or 6 and diagnostic trouble code feedback circuit, it is characterized in that, when described PWM pulse wide modulation signal is low level, the B1 port of MCU control unit exports high level, impel triode ON, automobile storage battery power supply makes saturation conduction between the collector electrode of triode and emitter by the 4th resistance, and the B3 port accepts of MCU control unit is to low-voltage square wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520006413.0U CN204465399U (en) | 2015-01-07 | 2015-01-07 | PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520006413.0U CN204465399U (en) | 2015-01-07 | 2015-01-07 | PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204465399U true CN204465399U (en) | 2015-07-08 |
Family
ID=53672221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520006413.0U Withdrawn - After Issue CN204465399U (en) | 2015-01-07 | 2015-01-07 | PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204465399U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767439A (en) * | 2015-01-07 | 2015-07-08 | 沙洲职业工学院 | PWM pulse width speed regulation signal setting and fault code feedback circuit |
| CN112953499A (en) * | 2021-05-14 | 2021-06-11 | 上海芯龙半导体技术股份有限公司南京分公司 | Built-in coding circuit for communication chip and communication chip |
-
2015
- 2015-01-07 CN CN201520006413.0U patent/CN204465399U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767439A (en) * | 2015-01-07 | 2015-07-08 | 沙洲职业工学院 | PWM pulse width speed regulation signal setting and fault code feedback circuit |
| CN104767439B (en) * | 2015-01-07 | 2017-04-26 | 沙洲职业工学院 | PWM pulse width speed regulation signal setting and fault code feedback circuit |
| CN112953499A (en) * | 2021-05-14 | 2021-06-11 | 上海芯龙半导体技术股份有限公司南京分公司 | Built-in coding circuit for communication chip and communication chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104767439A (en) | PWM pulse width speed regulation signal setting and fault code feedback circuit | |
| CN102097989B (en) | DC (direct current) motor driver | |
| CN103166444B (en) | Remote turn-off control signal receiving circuit | |
| CN109301796A (en) | A kind of PFC current foldback circuit and controller | |
| CN101710251A (en) | Single chip microcomputer halt reset circuit, device and method | |
| CN204465399U (en) | PWM pulse wide modulation signal feeding and diagnostic trouble code feedback circuit | |
| WO2021012866A1 (en) | Motor overvoltage protection circuit, undervoltage protection circuit, voltage protection circuit and motor | |
| CN201917839U (en) | Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen | |
| CN204964613U (en) | Zero -cross detection circuit | |
| CN201937530U (en) | Anti-reverse-rotation circuit of speed regulation feedback control of direct-current motor | |
| CN205229961U (en) | Anti breech lock power -off reset circuit of CMOS singlechip | |
| CN103872890B (en) | Switch power circuit with short circuit protective function | |
| CN105391320A (en) | Multi-phase power circuit | |
| CN202797873U (en) | Light-emitting diode (LED) short-circuit protection circuit | |
| CN202330540U (en) | Zero-cross detection circuit | |
| CN205160135U (en) | Can realize uninterrupted power source of many gears of fan speed governing | |
| CN202231609U (en) | Current-limiting device and electric system | |
| CN201130847Y (en) | Power supply circuit with testing and protection function | |
| CN204044242U (en) | A kind of electric energy meter monopulse acquisition process circuit | |
| CN204462339U (en) | A kind of electric quantity detecting circuit and solar water heater control panel | |
| CN208158431U (en) | A kind of time width detection circuit | |
| CN209344754U (en) | A kind of PFC current foldback circuit and controller | |
| CN207869019U (en) | A kind of stirring motor intelligent controller | |
| CN206977040U (en) | Realize wire-feed motor pulse current limliting and the circuit of stall overcurrent protection one by one | |
| CN202488111U (en) | Overcurrent detection and protection device for inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150708 Effective date of abandoning: 20170426 |