CN202159956U - Three-phase electricity detection controller - Google Patents
Three-phase electricity detection controller Download PDFInfo
- Publication number
- CN202159956U CN202159956U CN2011202816302U CN201120281630U CN202159956U CN 202159956 U CN202159956 U CN 202159956U CN 2011202816302 U CN2011202816302 U CN 2011202816302U CN 201120281630 U CN201120281630 U CN 201120281630U CN 202159956 U CN202159956 U CN 202159956U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- pin
- photoelectrical coupler
- diode
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model relates to a three-phase electricity detection controller which is used for monitoring three-phase commercial power. The three-phase electricity detection controller disclosed by the utility model comprises a depressurization and rectification circuit (1), an optical coupling circuit (2), an indicating circuit (3), a driving circuit (4), a switching circuit (5) and an anti-reverse connection circuit (6), wherein the input end of the depressurization and rectification circuit (1) is connected with a three-phase power supply, the depressurization and rectification circuit (1) is used for outputting half-wave rectification voltage to the input end of the optical coupling circuit (2) after conducting depressurization and rectification on the three-phase power supply, the output end of the optical coupling circuit (2) is connected with the input end of the driving circuit (4), the output end of the driving circuit (4) is connected with the switching circuit (5), the input end of the anti-reverse connection circuit (6) is connected with a positive pole of the power supply, and the output end of the anti-reverse connection circuit (6) is connected with the output end of the optical coupling circuit (2). The three-phase power detection controller has the advantages of solving the problems that an ordinary relay can only detect a single phase and is prone to damages, being simple in structure, and further adopting one-stage optical coupling and an one-stage relay for isolation to enhance the reliability and the safety of the three-phase power detection controller.
Description
Technical field
The utility model relates to a kind of three-phase electricity and detects controller, specifically adopts two-stage to isolate the three-phase mains and detects controller.
Background technology
Various unattended stand-by power supply machine rooms adopt common AC220V relay as city's electro-detection control use mostly at present; Can only detect single-phase voltage signal; When wherein in addition the electricity of two phases occur mutually when unusual, automatic control system can't normally start use. and the AC220V relay is because for a long time in working order; Occur easily burning coil or contact oxidation and phenomenon, cause the situation of automatic control system misoperation.
Summary of the invention
The utility model relates to a kind of three-phase electricity and detects controller; It can solve common relay and can only detect single-phase; To damage and the three-phase two-stage isolation city electro-detection controller of design easily. its characteristics are to detect simultaneously three-phase voltage signal; Adopt the one-level optical coupling to add the one-level relay and isolate, increase its reliability and fail safe.
The technical solution of the utility model is on existing indicating circuit (3) basis; Be characterized in that it has step-down rectifying circuit (1), optically coupled circuit (2), drive circuit (4); Switching circuit (5); Reverse-connection preventing circuit (6), the input of described step-down rectifying circuit (1) is connected with three phase mains, step-down rectifying circuit (1) to the three phase mains step-down rectifier after output halfwave rectifier voltage to the input of optically coupled circuit (2); The output of optically coupled circuit (2) is connected with drive circuit (4) input; Drive circuit (4) output is connected with switching circuit (5), the input termination positive source of reverse-connection preventing circuit (6), and the output of reverse-connection preventing circuit (6) is connected with the output of optically coupled circuit (2).
Above-described step-down rectifying circuit (1) is by resistance R 1, R2, R3; Diode D3, D4, D5; Capacitor C 1, C2, C3 form; Three phase mains A end is connected with an end of resistance R 1 through fuse FU4, and the other end of resistance R 1 is connected with the positive pole of diode D3, and the negative pole of diode D3 is connected with an end of resistance R 4 and the positive pole of capacitor C 1; 2 pin of photoelectrical coupler U1 in the negative pole of capacitor C 1 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U1 in the other end of resistance R 4 and the optically coupled circuit (2) is connected; Three phase mains B end is connected with an end of resistance R 2 through fuse FU5; The other end of resistance R 2 is connected with the positive pole of diode D4; The negative pole of diode D4 is connected with an end of resistance R 5 and the positive pole of capacitor C 2; 2 pin of photoelectrical coupler U2 in the negative pole of capacitor C 2 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U2 in the other end of resistance R 5 and the optically coupled circuit (2) is connected; Three phase mains C end is connected with an end of resistance R 3 through fuse FU6; The other end of resistance R 3 is connected with the positive pole of diode D5; The negative pole of diode D5 is connected with an end of resistance R 6 and the positive pole of capacitor C 3; 2 pin of photoelectrical coupler U3 in the negative pole of capacitor C 3 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U3 in the other end of resistance R 6 and the optically coupled circuit (2) is connected.
The described optically coupled circuit of the utility model (2) is made up of photoelectrical coupler U1, U2, U3; 1 pin of photoelectrical coupler U1 is connected with an end of resistance R 4; The other end of resistance R 4 is connected with diode D3 negative pole in the step-down rectifying circuit (1); 2 pin of photoelectrical coupler U1 and 2 pin of photoelectrical coupler U2 are connected with capacitor C 1 negative pole in the step-down rectifying circuit (1); The negative pole of diode D1 in 3 pin of photoelectrical coupler U1 and the reverse-connection preventing circuit (6) is connected, and 4 pin of photoelectrical coupler U1 are connected with 3 pin of photoelectrical coupler U2; 1 pin of photoelectrical coupler U2 is connected with an end of resistance R 5; The other end of resistance R 5 is connected with diode D4 negative pole in the step-down rectifying circuit (1); 2 pin of photoelectrical coupler U2 and 2 pin of photoelectrical coupler U3 are connected with capacitor C 2 negative poles in the step-down rectifying circuit (1), and 4 pin of photoelectrical coupler U2 are connected with 3 pin of photoelectrical coupler U3; 1 pin of photoelectrical coupler U3 is connected with an end of resistance R 6; The other end of resistance R 6 is connected with diode D5 negative pole in the step-down rectifying circuit (1); Capacitor C 3 negative poles in 2 pin of photoelectrical coupler U3 and 2 pin of photoelectrical coupler U2 and the step-down rectifying circuit (1) and the NS end of three phase mains are connected; 4 pin of photoelectrical coupler U3 are connected with an end of resistance R 7, and the base stage of the triode Q1 in the other end of resistance R 7 and the drive circuit (4) is connected.
The described drive circuit of the utility model (4) is by capacitor C 4; Triode Q1 forms; The base stage of triode Q1 is connected with the positive pole of capacitor C 4 and an end of resistance R 7; The other end of resistance R 7 is connected with 4 pin of the photoelectrical coupler U3 of optically coupled circuit (2), and the negative pole of capacitor C 4 is connected with ground wire with the emitter of triode Q1, and the collector electrode of triode Q1 is connected with the diode D2 positive pole of switching circuit (5).
The described switching circuit of the utility model (5) is made up of diode D2 and relay K A4; The negative pole of diode D2 and the end of relay K A4 are connected with diode D1 negative pole in the reverse-connection preventing circuit (6), and the other end of relay K A4 is connected with the positive pole of diode D2.
The described reverse-connection preventing circuit of the utility model (6) is made up of diode D1 and capacitor C 5; The positive pole of diode D1 connects the positive pole of power supply; The negative pole of diode D1 connects the positive pole of capacitor C 5 and 3 pin of the middle photoelectrical coupler U1 of optically coupled circuit (2), and the negative pole of capacitor C 5 is connected with ground wire.
The operation principle of the utility model is that three-phase voltage passes through resistance R 1 respectively, and R2 is after the 100K/2W electric metal film resistance step-down of R3, by diode D3; D4, D5 model (1N4007) rectifier diode carry out after the halfwave rectifier by capacitor C 1, C2, and C3 carries out filtering. and accomplish and transfer low pressure to by high pressure; Transfer direct current to by interchange, direct voltage is added to photoelectrical coupler U1 then, U2, U3 model (TLP521) elementary; Photoelectrical coupler U1, U2, U3 receive respectively from the signal behind the three-phase circuit step-down rectifier; The working method of secondary employing series connection, when arbitrary mutually elementary direct voltage signal wherein occurs when unusual, photoelectrical coupler U1 then; U2, the secondary disconnection of U3 makes the triode Q1 base stage of drive circuit (4) voltage of losing the job; Thereby collector electrode and the emitter of triode Q1 are in off-state, the relay K A4 voltage of losing the job like this, thus contact K1 and K3 break off and obtain whether normal control signal of civil power.When the three-phase mains just often, photoelectrical coupler U1, U2, the U3 conducting, d. c. voltage signal is delivered to R8 resistance and LD1 light-emitting diode, and LD1 is lighted, the civil power normal condition of indication.When supply voltage correctly connects; The diode D1 conducting of 1N4007; Make the signal can the normal flow mistake. when the supply voltage reversal connection, diode D1 ends, and makes voltage signal can't flow into the three-phase mains and detects controller; Prevent connecing circnit NOT thereby form one, can effectively protect three-phase electricity to detect controller.
The utility model has the advantages that can solve common relay can only detect single-phasely, damage problem easily, simple in structure, and adopt the one-level optical coupling to add the one-level relay and isolate, increase its reliability and fail safe.
Description of drawings
Fig. 1 is the circuit block diagram of the utility model;
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
According to Fig. 1, shown in 2, the utility model is characterized in that it has step-down rectifying circuit 1 on existing indicating circuit 3 bases; Optically coupled circuit 2, drive circuit 4, switching circuit 5; Reverse-connection preventing circuit 6, the input of described step-down rectifying circuit 1 is connected with three phase mains, and output halfwave rectifier voltage is to the input of optically coupled circuit 2 behind 1 pair of three phase mains step-down rectifier of step-down rectifying circuit; The output of optically coupled circuit 2 is connected with drive circuit 4 inputs; Drive circuit 4 outputs are connected with switching circuit 5, the input termination positive source of reverse-connection preventing circuit 6, and the output of reverse-connection preventing circuit 6 is connected with the output of optically coupled circuit 2.Described step-down rectifying circuit 1 is by 100K/2W electric metal film resistance R1, R2, R3; Diode D3, D4, D5 model (1N4007); Capacitor C 1, C2, C3 form; Three phase mains A end is connected with an end of resistance R 1 through fuse FU4, and the other end of resistance R 1 is connected with the positive pole of diode D3, and the negative pole of diode D3 is connected with an end of resistance R 4 and the positive pole of capacitor C 1; 2 pin of photoelectrical coupler U1 in the negative pole of capacitor C 1 and the optically coupled circuit 2 are connected, and 1 pin of the photoelectrical coupler U1 model (TLP521) in the other end of resistance R 4 and the optically coupled circuit (2) is connected; Three phase mains B end is connected with an end of resistance R 2 through fuse FU5; The other end of resistance R 2 is connected with the positive pole of diode D4; The negative pole of diode D4 is connected with an end of resistance R 5 and the positive pole of capacitor C 2; 2 pin of photoelectrical coupler U2 in the negative pole of capacitor C 2 and the optically coupled circuit 2 are connected, and 1 pin of the photoelectrical coupler U2 in the other end of resistance R 5 and the optically coupled circuit 2 is connected; Three phase mains C end is connected with an end of resistance R 3 through fuse FU6; The other end of resistance R 3 is connected with the positive pole of diode D5; The negative pole of diode D5 is connected with an end of resistance R 6 and the positive pole of capacitor C 3; 2 pin of photoelectrical coupler U3 in the negative pole of capacitor C 3 and the optically coupled circuit 2 are connected, and 1 pin of the photoelectrical coupler U3 in the other end of resistance R 6 and the optically coupled circuit 2 is connected.Described optically coupled circuit 2 is made up of photoelectrical coupler U1, U2, U3; 1 pin of photoelectrical coupler U1 is connected with an end of resistance R 4; The other end of resistance R 4 is connected with diode D3 negative pole in the step-down rectifying circuit 1; 2 pin of photoelectrical coupler U1 and 2 pin of photoelectrical coupler U2 are connected with capacitor C 1 negative pole in the step-down rectifying circuit 1; The negative pole of diode D1 in 3 pin of photoelectrical coupler U1 and the reverse-connection preventing circuit 6 is connected, and 4 pin of photoelectrical coupler U1 are connected with 3 pin of photoelectrical coupler U2; 1 pin of photoelectrical coupler U2 is connected with an end of resistance R 5; The other end of resistance R 5 is connected with diode D4 negative pole in the step-down rectifying circuit 1; 2 pin of photoelectrical coupler U2 and 2 pin of photoelectrical coupler U3 are connected with capacitor C 2 negative poles in the step-down rectifying circuit 1, and 4 pin of photoelectrical coupler U2 are connected with 3 pin of photoelectrical coupler U3; 1 pin of photoelectrical coupler U3 is connected with an end of resistance R 6; The other end of resistance R 6 is connected with diode D5 negative pole in the step-down rectifying circuit 1; Capacitor C 3 negative poles in 2 pin of photoelectrical coupler U3 and 2 pin of photoelectrical coupler U2 and the step-down rectifying circuit 1 and the NS end of three phase mains are connected; 4 pin of photoelectrical coupler U3 are connected with an end of resistance R 7, and the base stage of the triode Q1 in the other end of resistance R 7 and the drive circuit 4 is connected.Described drive circuit 4 is by capacitor C 4; Triode Q1 forms; The base stage of triode Q1 is connected with the positive pole of capacitor C 4 and an end of resistance R 7; The other end of resistance R 7 is connected with 4 pin of the photoelectrical coupler U3 of optically coupled circuit 2, and the negative pole of capacitor C 4 is connected with ground wire with the emitter of triode Q1, and the collector electrode of triode Q1 is connected with the diode D2 positive pole of switching circuit 5.Described switching circuit 5 is made up of diode D2 and relay K A4, and the negative pole of diode D2 and the end of relay K A4 are connected with diode D1 negative pole in the reverse-connection preventing circuit 6, and the other end of relay K A4 is connected with the positive pole of diode D2.Described reverse-connection preventing circuit 6 is made up of diode D1 and capacitor C 5, and the positive pole of diode D1 connects the positive pole of power supply, and the negative pole of diode D1 connects 3 pin of photoelectrical coupler U1 in positive pole and the optically coupled circuit 2 of capacitor C 5, and the negative pole of capacitor C 5 is connected with ground wire.Described indicating circuit is made up of with light-emitting diode LD1 resistance R 8; 4 pin of photoelectrical coupler U3 in one end of resistance R 8 and the optically coupled circuit 2 are connected; The other end of resistance R 8 is connected with the positive pole of light-emitting diode LD1, and the negative pole of light-emitting diode LD1 is connected with ground wire.
Claims (6)
1. a three-phase electricity detects controller, and it comprises indicating circuit (3), it is characterized in that it has step-down rectifying circuit (1); Optically coupled circuit (2); Drive circuit (4), switching circuit (5), reverse-connection preventing circuit (6); The input of described step-down rectifying circuit (1) is connected with three phase mains; Step-down rectifying circuit (1) to the three phase mains step-down rectifier after output halfwave rectifier voltage to the input of optically coupled circuit (2), the output of optically coupled circuit (2) is connected with drive circuit (4) input, drive circuit (4) output is connected with switching circuit (5); The input termination positive source of reverse-connection preventing circuit (6), the output of reverse-connection preventing circuit (6) is connected with the output of optically coupled circuit (2).
2. a kind of three-phase electricity according to claim 1 detects controller; It is characterized in that described step-down rectifying circuit (1) is by resistance R 1, R2, R3; Diode D3, D4, D5, capacitor C 1, C2, C3 form, and three phase mains A end is connected with an end of resistance R 1 through fuse FU4; The other end of resistance R 1 is connected with the positive pole of diode D3; The negative pole of diode D3 is connected with an end of resistance R 4 and the positive pole of capacitor C 1, and 2 pin of the photoelectrical coupler U1 in the negative pole of capacitor C 1 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U1 in the other end of resistance R 4 and the optically coupled circuit (2) is connected; Three phase mains B end is connected with an end of resistance R 2 through fuse FU5; The other end of resistance R 2 is connected with the positive pole of diode D4; The negative pole of diode D4 is connected with an end of resistance R 5 and the positive pole of capacitor C 2; 2 pin of photoelectrical coupler U2 in the negative pole of capacitor C 2 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U2 in the other end of resistance R 5 and the optically coupled circuit (2) is connected; Three phase mains C end is connected with an end of resistance R 3 through fuse FU6; The other end of resistance R 3 is connected with the positive pole of diode D5; The negative pole of diode D5 is connected with an end of resistance R 6 and the positive pole of capacitor C 3; 2 pin of photoelectrical coupler U3 in the negative pole of capacitor C 3 and the optically coupled circuit (2) are connected, and 1 pin of the photoelectrical coupler U3 in the other end of resistance R 6 and the optically coupled circuit (2) is connected.
3. a kind of three-phase electricity according to claim 1 detects controller; It is characterized in that described optically coupled circuit (2) is made up of photoelectrical coupler U1, U2, U3; 1 pin of photoelectrical coupler U1 is connected with an end of resistance R 4; The other end of resistance R 4 is connected with diode D3 negative pole in the step-down rectifying circuit (1); 2 pin of photoelectrical coupler U1 and 2 pin of photoelectrical coupler U2 are connected with capacitor C 1 negative pole in the step-down rectifying circuit (1), and the negative pole of the diode D1 in 3 pin of photoelectrical coupler U1 and the reverse-connection preventing circuit (6) is connected, and 4 pin of photoelectrical coupler U1 are connected with 3 pin of photoelectrical coupler U2; 1 pin of photoelectrical coupler U2 is connected with an end of resistance R 5; The other end of resistance R 5 is connected with diode D4 negative pole in the step-down rectifying circuit (1); 2 pin of photoelectrical coupler U2 and 2 pin of photoelectrical coupler U3 are connected with capacitor C 2 negative poles in the step-down rectifying circuit (1), and 4 pin of photoelectrical coupler U2 are connected with 3 pin of photoelectrical coupler U3; 1 pin of photoelectrical coupler U3 is connected with an end of resistance R 6; The other end of resistance R 6 is connected with diode D5 negative pole in the step-down rectifying circuit (1); Capacitor C 3 negative poles in 2 pin of photoelectrical coupler U3 and 2 pin of photoelectrical coupler U2 and the step-down rectifying circuit (1) and the NS end of three phase mains are connected; 4 pin of photoelectrical coupler U3 are connected with an end of resistance R 7, and the base stage of the triode Q1 in the other end of resistance R 7 and the drive circuit (4) is connected.
4. a kind of three-phase electricity according to claim 1 detects controller; It is characterized in that described drive circuit (4) is by capacitor C 4; Triode Q1 forms, and the base stage of triode Q1 is connected with the positive pole of capacitor C 4 and an end of resistance R 7, and the other end of resistance R 7 is connected with 4 pin of the photoelectrical coupler U3 of optically coupled circuit (2); The negative pole of capacitor C 4 is connected with ground wire with the emitter of triode Q1, and the collector electrode of triode Q1 is connected with the diode D2 positive pole of switching circuit (5).
5. a kind of three-phase electricity according to claim 1 detects controller; It is characterized in that described switching circuit (5) is made up of diode D2 and relay K A4; The negative pole of diode D2 and the end of relay K A4 are connected with diode D1 negative pole in the reverse-connection preventing circuit (6), and the other end of relay K A4 is connected with the positive pole of diode D2.
6. a kind of three-phase electricity according to claim 1 detects controller; It is characterized in that described reverse-connection preventing circuit (6) is made up of diode D1 and capacitor C 5; The positive pole of diode D1 connects the positive pole of power supply; The negative pole of diode D1 connects the positive pole of capacitor C 5 and 3 pin of the middle photoelectrical coupler U1 of optically coupled circuit (2), and the negative pole of capacitor C 5 is connected with ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202816302U CN202159956U (en) | 2011-08-04 | 2011-08-04 | Three-phase electricity detection controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202816302U CN202159956U (en) | 2011-08-04 | 2011-08-04 | Three-phase electricity detection controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202159956U true CN202159956U (en) | 2012-03-07 |
Family
ID=45767579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202816302U Expired - Lifetime CN202159956U (en) | 2011-08-04 | 2011-08-04 | Three-phase electricity detection controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202159956U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652216A (en) * | 2016-03-23 | 2016-06-08 | 哈尔滨飞机工业集团有限责任公司 | Detection circuit for helicopter alternating current power supply system |
| CN106329510A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Arc suppression mechanism for arc suppression and resonance elimination apparatus |
| CN109374959A (en) * | 2018-12-29 | 2019-02-22 | 常熟开关制造有限公司(原常熟开关厂） | Three-phase mains voltage quick detection circuit and automatic transfer switching electric appliance |
| CN110161432A (en) * | 2019-05-09 | 2019-08-23 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of aviation AC supply voltage Acquisition Circuit |
| CN110988733A (en) * | 2019-11-25 | 2020-04-10 | 天津津航计算技术研究所 | Be applied to voltage acquisition circuit of aircraft AC115V three-phase alternating current |
| CN113702735A (en) * | 2021-08-23 | 2021-11-26 | 天津津航计算技术研究所 | BIT self-detection circuit applied to multi-channel discrete quantity acquisition channel |
-
2011
- 2011-08-04 CN CN2011202816302U patent/CN202159956U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652216A (en) * | 2016-03-23 | 2016-06-08 | 哈尔滨飞机工业集团有限责任公司 | Detection circuit for helicopter alternating current power supply system |
| CN105652216B (en) * | 2016-03-23 | 2018-05-29 | 哈尔滨飞机工业集团有限责任公司 | A kind of Helicopter AC power-supply system detection circuit |
| CN106329510A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Arc suppression mechanism for arc suppression and resonance elimination apparatus |
| CN109374959A (en) * | 2018-12-29 | 2019-02-22 | 常熟开关制造有限公司(原常熟开关厂） | Three-phase mains voltage quick detection circuit and automatic transfer switching electric appliance |
| CN109374959B (en) * | 2018-12-29 | 2021-01-12 | 常熟开关制造有限公司(原常熟开关厂） | Three-phase power supply voltage rapid detection circuit and automatic transfer switching device |
| CN110161432A (en) * | 2019-05-09 | 2019-08-23 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of aviation AC supply voltage Acquisition Circuit |
| CN110988733A (en) * | 2019-11-25 | 2020-04-10 | 天津津航计算技术研究所 | Be applied to voltage acquisition circuit of aircraft AC115V three-phase alternating current |
| CN113702735A (en) * | 2021-08-23 | 2021-11-26 | 天津津航计算技术研究所 | BIT self-detection circuit applied to multi-channel discrete quantity acquisition channel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202159956U (en) | Three-phase electricity detection controller | |
| CN103000964B (en) | Controller of battery management system | |
| CN103166175B (en) | LED drive power protection circuit against input over-voltage | |
| CN105226611A (en) | Short circuit/the overload protecting circuit of single-phase transformer | |
| CN204290268U (en) | A kind of protective circuit | |
| CN203965858U (en) | A kind of greenhouse actuator controller | |
| CN102097787B (en) | Motor phase sequence default phase protector adopting resistive-capacitive (RC) phase-shift circuit | |
| CN103364688B (en) | Three-jack socket electric leakage detection circuit | |
| CN203513016U (en) | Power supply open-phase protection device of lift control cabinet | |
| CN203572900U (en) | Broken line detection circuit for state grid special transformer collection terminal control circuit | |
| CN202340141U (en) | Charging equipment | |
| CN104820139A (en) | Three-phase power supply phase lack detection device | |
| CN201994637U (en) | Motor comprehensive protector for double-star type network detection | |
| CN203992757U (en) | A kind of overvoltage crowbar of electric welding machine | |
| CN107666237A (en) | A kind of type photoelectric isolating A.C. contactor startup optimization holding circuit | |
| CN203205828U (en) | LED driving power supply input overvoltage protection circuit | |
| CN202888790U (en) | Resettable over/under-voltage protector based on one-chip microcomputer | |
| CN208781740U (en) | Relay for alternating-current charging pile and zero-crossing detection arc extinguishing circuit thereof | |
| CN205847074U (en) | A kind of type photoelectric isolating A.C. contactor startup optimization holding circuit | |
| CN202586829U (en) | Tea machine cake press motor controller | |
| CN203672981U (en) | Three-phase power supply phase loss detection device | |
| CN203745551U (en) | Three phase power supply phase deficiency detection device | |
| CN204440177U (en) | Economical automatic water supplement control circuit | |
| CN205610463U (en) | Converter with power -fail protection | |
| CN103434907A (en) | Power supply open-phase protection device of elevator control cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120307 |