CN202221440U - Special power supply for three-phase intelligent electricity meter - Google Patents
Special power supply for three-phase intelligent electricity meter Download PDFInfo
- Publication number
- CN202221440U CN202221440U CN2011201921015U CN201120192101U CN202221440U CN 202221440 U CN202221440 U CN 202221440U CN 2011201921015 U CN2011201921015 U CN 2011201921015U CN 201120192101 U CN201120192101 U CN 201120192101U CN 202221440 U CN202221440 U CN 202221440U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistance
- diode
- links
- link
- 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 - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a special power supply for a three-phase intelligent electricity meter. An ACL (Access Control List) end of an alternate current power supply of the special power supply is connected with one end of a fuse FU. The other end of the fuse FU is connected with one end of an EMC (Electro Magnetic Compatibility) filter (1). The other end of the EMC filter (1) is connected with a rectifier full-bridge circuit (2). An end a in the rectifier full-bridge circuit (2) is connected with an anode of a capacitor C1, a cathode of a TVS1 (Transient Voltage Suppressor1) and one end of a resistor R4. The resistor R4, a resistor R5 and a resistor R6 are in serial connection with each other. A cathode of the capacitor C1, an anode of the TVS1 and one end of the resistor R6 are all connected with an anode of a capacitor C2, an end a of a voltage-limiting protection circuit (3), a cathode of a transient voltage suppressor TVS2 and one end of a resistor R7. The resistor R7, a resistor R8 and a resistor R9 are in serial connection with each other. The special power supply for the three-phase intelligent electricity meter has small volume, high working efficiency, high reliability and strong anti-interference capability.
Description
Technical field:
The utility model relates to a kind of power supply, relates in particular to a kind of three-phase intelligent ammeter power source special.
Background technology:
Traditional ammeter be short-circuited with power supply output or during the overvoltage fault power supply can not carry out self-protection, its volume is bigger, efficient is low, poor reliability, interference free performance is poor, can not make the power supply operate as normal well.
The utility model content:
The purpose of the utility model provides a kind of three-phase intelligent ammeter power source special, and its volume is little, high efficiency, reliability is high, antijamming capability is strong, output be short-circuited or during the overvoltage fault power supply can protect automatically, fault is resumed work after disappearing automatically; Can be compatible the input of three-phase and four-line voltage (A, B, C, N) and reach burst of pulses and the anti-interference level of surge level Four; As long as A, B, C has two lines to connect and just can guarantee the power supply operate as normal among the N.
In order to solve the existing problem of background technology, the utility model is to adopt following technical scheme: it comprises EMC wave filter 1, rectification full-bridge circuit 2, voltage-limiting protection circuit 3, overvoltage crowbar 4, leakage inductance absorbing clamp circuit 5, voltage stabilizing feedback circuit 6, optocoupler feedback circuit 7, fuse F U, capacitor C 5, capacitor C 8-C9, capacitor C Y1-CY3, capacitor C 11-C17, Transient Suppression Diode TVS1-TVS2, voltage stabilizing diode ZD1, diode D9-D10, diode D13-D15, resistance R 4-R10, resistance R 12-R15, resistance R 24, resistance R 30-R34, common mode inductance L2-L4, switching tube Q1, main control chip IC1 and three terminal regulator IC2, and the ACL end of AC power links to each other with fuse F U one end; The fuse F U other end links to each other with EMC wave filter 1 one ends, and EMC wave filter 1 other end links to each other with rectification full-bridge circuit 2, and a end in the rectification full-bridge circuit 2 links to each other with capacitor C 1 positive pole, Transient Suppression Diode TVS1 negative pole, resistance R 4 one ends; Resistance R 4, resistance R 5 and resistance R 6 are in series, and capacitor C 1 negative pole, Transient Suppression Diode TVS1 positive pole, resistance R 6 one ends all link to each other with resistance R 7 one ends with a end, the Transient Suppression Diode TVS2 negative pole of capacitor C 2 positive poles, voltage-limiting protection circuit 3, and resistance R 7, resistance R 8 and resistance R 9 are in series; Capacitor C 2 negative poles, Transient Suppression Diode TVS2 positive pole and resistance R 9 one ends all connect power supply, and the b end of voltage-limiting protection circuit 3 links to each other with 8 pin and the diode D10 negative pole of main control chip IC1, and 1,2,4 pin of main control chip IC1 link to each other with optocoupler feedback circuit 7; 3 pin of main control chip IC1 link to each other with resistance R 12 1 ends, and resistance R 12 other ends link to each other with 3 ends of resistance R 14 1 ends, resistance R 24 1 ends and switching tube Q1, resistance R 24 another termination powers; Resistance R 14 other ends link to each other with 1 end, resistance R 13 1 ends of switching tube Q1, and resistance R 13 other ends link to each other with 5 ends of main control chip IC1, and 6 ends of main control chip IC1 link to each other with resistance R 15 1 ends, overvoltage crowbar 4, voltage stabilizing diode DZ1 negative pole, diode D10 positive pole, capacitor C 5 positive poles respectively; Capacitor C 5 negative poles link to each other with optocoupler feedback circuit 7, and resistance R 15 other ends link to each other with diode D9 negative pole, and secondary n2 one end of voltage stabilizing diode DZ1 positive pole and transformer TR links to each other with power supply; The secondary n2 other end of transformer TR links to each other with diode D9 positive pole and resistance R 10 1 ends respectively, and resistance R 10 other ends link to each other with optocoupler feedback circuit 7, and the c end of voltage-limiting protection circuit 3 links to each other with overvoltage crowbar 4; Overvoltage crowbar 4 links to each other with leakage inductance absorbing clamp circuit 5, and a end of leakage inductance absorbing clamp circuit 5 links to each other with the end of the elementary n1 of transformer TR, and the b end of leakage inductance absorbing clamp circuit 5 links to each other with the other end of the elementary n1 of transformer TR and 2 ends of switching tube Q1; The end of the secondary n3 of transformer TR links to each other with diode C13 is anodal, and diode C13 negative pole and common mode inductance L 2 one ends, 8 anodal linking to each other of capacitor C, the common mode inductance L2 other end links to each other with voltage stabilizing feedback circuit 6 with capacitor C 9 positive poles; Voltage stabilizing feedback circuit 6 is parallelly connected in twos with resistance R 30 and resistance R 31; Resistance R 30 1 ends link to each other with power supply V1, resistance R 30 other end ground connection, and the other end of the secondary n3 of transformer TR, capacitor C 8 negative poles, capacitor C 9 negative poles and voltage stabilizing feedback circuit 6 all link to each other with capacitor C Y1 one end, capacitor C Y2 one end, capacitor C Y3 one end; And capacitor C Y1 one end ground connection; Another termination power of capacitor C Y1, the equal ground connection of secondary n4 one end of the capacitor C Y2 other end, capacitor C 12 negative poles, capacitor C 11 negative poles, transformer TR, capacitor C 12, resistance R 33, resistance R 32 be parallel connection in twos; Capacitor C 12 positive poles, common mode inductance L3 one end link to each other with power supply V2; The common mode inductance L3 other end and diode D14 negative pole, 11 anodal linking to each other of capacitor C, diode D14 positive pole links to each other with the secondary n4 other end of transformer TR, TR level of the capacitor C Y3 other end and transformer n5 one end, capacitor C 15 negative poles, 2 ends of three terminal regulator IC2, capacitor C 16 negative poles, resistance R 34 1 ends, the equal ground connection of capacitor C 17 1 ends; TR level of the transformer n5 other end links to each other with diode D15 is anodal; Diode D15 negative pole links to each other with 1 end of capacitor C 15 positive poles, three terminal regulator IC2,3 ends of three terminal regulator IC2 and common mode inductance L 4 one ends and 16 anodal linking to each other of capacitor C, and the common mode inductance L4 other end all links to each other with power supply V3 with resistance R 34 other ends, capacitor C 17 other ends.
Described main control chip IC1 adopts the NCP1207 chip.
Fuse F U in the utility model plays the emergency protection effect in power supply input circuit; NTC is a negative tempperature coefficient thermistor; Dash current when making start is limited in the rated range; The EMC wave filter mainly is for preventing that burst of pulses from disturbing; Alternating current becomes direct current through the full-bridge rectification that electric capacity D1-D8 forms, and is filtered into the smooth direct current power supply by capacitor C 1-C2, and 2 series connection can reach withstand voltage 800Vdc to capacitor C 1 with capacitor C; Capacitor C Y1-CY3 is that high frequency common mode noise provides the filtering bypass channel.Voltage-limiting protection circuit 3 provides voltage-limiting protection for 8 pin of main control chip IC1.Overvoltage crowbar 4 cooperates with main control chip IC1 provides the input end over-voltage protecting function; Power supply was in holding state and reduces switching tube Q1 voltage stress and make the unlikely damage of power supply when input voltage was too high.Leakage inductance absorbing clamp circuit 5, voltage stabilizing feedback circuit 6 are regulated ON time and switch periods and are realized the adjustment of transformer TR power with main control chip IC1 and peripheral circuits CS pipe Q1 thereof, further realize power output end voltage stabilizing and current-limiting protection function.Power supply has three tunnel outputs, and main road V1 leans on the optocoupler feedback circuit to realize voltage stabilizing and overcurrent protection; Bypass output V2 receives each umber of turn of transformer and V1-V3 current affects to realize voltage stabilizing in certain limit; Bypass output V3 can realize accurate voltage stabilizing and current-limiting protection by three-terminal voltage-stabilizing IC2.
The utility model beneficial effect is: volume is little, high efficiency, reliability is high, antijamming capability is strong, output be short-circuited or during the overvoltage fault power supply can protect automatically, fault is resumed work after disappearing automatically; Can be compatible the input of three-phase and four-line voltage (A, B, C, N) and reach burst of pulses and the anti-interference level of surge level Four; As long as A, B, C has two lines to connect and just can guarantee the power supply operate as normal among the N.
Description of drawings:
Fig. 1 is the structural representation of the utility model.
Embodiment:
With reference to Fig. 1, this embodiment adopts following technical scheme: it comprises EMC wave filter 1, rectification full-bridge circuit 2, voltage-limiting protection circuit 3, overvoltage crowbar 4, leakage inductance absorbing clamp circuit 5, voltage stabilizing feedback circuit 6, optocoupler feedback circuit 7, fuse F U, capacitor C 5, capacitor C 8-C9, capacitor C Y1-CY3, capacitor C 11-C17, Transient Suppression Diode TVS1-TVS2, voltage stabilizing diode ZD1, diode D9-D10, diode D13-D15, resistance R 4-R10, resistance R 12-R15, resistance R 24, resistance R 30-R34, common mode inductance L2-L4, switching tube Q1, main control chip IC1 and three terminal regulator IC2, and the ACL end of AC power links to each other with fuse F U one end; The fuse F U other end links to each other with EMC wave filter 1 one ends, and EMC wave filter 1 other end links to each other with rectification full-bridge circuit 2, and a end in the rectification full-bridge circuit 2 links to each other with capacitor C 1 positive pole, Transient Suppression Diode TVS1 negative pole, resistance R 4 one ends; Resistance R 4, resistance R 5 and resistance R 6 are in series, and capacitor C 1 negative pole, Transient Suppression Diode TVS1 positive pole, resistance R 6 one ends all link to each other with resistance R 7 one ends with a end, the Transient Suppression Diode TVS2 negative pole of capacitor C 2 positive poles, voltage-limiting protection circuit 3, and resistance R 7, resistance R 8 and resistance R 9 are in series; Capacitor C 2 negative poles, Transient Suppression Diode TVS2 positive pole and resistance R 9 one ends all connect power supply, and the b end of voltage-limiting protection circuit 3 links to each other with 8 pin and the diode D10 negative pole of main control chip IC1, and 1,2,4 pin of main control chip IC1 link to each other with optocoupler feedback circuit 7; 3 pin of main control chip IC1 link to each other with resistance R 12 1 ends, and resistance R 12 other ends link to each other with 3 ends of resistance R 14 1 ends, resistance R 24 1 ends and switching tube Q1, resistance R 24 another termination powers; Resistance R 14 other ends link to each other with 1 end, resistance R 13 1 ends of switching tube Q1, and resistance R 13 other ends link to each other with 5 ends of main control chip IC1, and 6 ends of main control chip IC1 link to each other with resistance R 15 1 ends, overvoltage crowbar 4, voltage stabilizing diode DZ1 negative pole, diode D10 positive pole, capacitor C 5 positive poles respectively; Capacitor C 5 negative poles link to each other with optocoupler feedback circuit 7, and resistance R 15 other ends link to each other with diode D9 negative pole, and secondary n2 one end of voltage stabilizing diode DZ1 positive pole and transformer TR links to each other with power supply; The secondary n2 other end of transformer TR links to each other with diode D9 positive pole and resistance R 10 1 ends respectively, and resistance R 10 other ends link to each other with optocoupler feedback circuit 7, and the c end of voltage-limiting protection circuit 3 links to each other with overvoltage crowbar 4; Overvoltage crowbar 4 links to each other with leakage inductance absorbing clamp circuit 5, and a end of leakage inductance absorbing clamp circuit 5 links to each other with the end of the elementary n1 of transformer TR, and the b end of leakage inductance absorbing clamp circuit 5 links to each other with the other end of the elementary n1 of transformer TR and 2 ends of switching tube Q1; The end of the secondary n3 of transformer TR links to each other with diode C13 is anodal, and diode C13 negative pole and common mode inductance L 2 one ends, 8 anodal linking to each other of capacitor C, the common mode inductance L2 other end links to each other with voltage stabilizing feedback circuit 6 with capacitor C 9 positive poles; Voltage stabilizing feedback circuit 6 is parallelly connected in twos with resistance R 30 and resistance R 31; Resistance R 30 1 ends link to each other with power supply V1, resistance R 30 other end ground connection, and the other end of the secondary n3 of transformer TR, capacitor C 8 negative poles, capacitor C 9 negative poles and voltage stabilizing feedback circuit 6 all link to each other with capacitor C Y1 one end, capacitor C Y2 one end, capacitor C Y3 one end; And capacitor C Y1 one end ground connection; Another termination power of capacitor C Y1, the equal ground connection of secondary n4 one end of the capacitor C Y2 other end, capacitor C 12 negative poles, capacitor C 11 negative poles, transformer TR, capacitor C 12, resistance R 33, resistance R 32 be parallel connection in twos; Capacitor C 12 positive poles, common mode inductance L3 one end link to each other with power supply V2; The common mode inductance L3 other end and diode D14 negative pole, 11 anodal linking to each other of capacitor C, diode D14 positive pole links to each other with the secondary n4 other end of transformer TR, TR level of the capacitor C Y3 other end and transformer n5 one end, capacitor C 15 negative poles, 2 ends of three terminal regulator IC2, capacitor C 16 negative poles, resistance R 34 1 ends, the equal ground connection of capacitor C 17 1 ends; TR level of the transformer n5 other end links to each other with diode D15 is anodal; Diode D15 negative pole links to each other with 1 end of capacitor C 15 positive poles, three terminal regulator IC2,3 ends of three terminal regulator IC2 and common mode inductance L 4 one ends and 16 anodal linking to each other of capacitor C, and the common mode inductance L4 other end all links to each other with power supply V3 with resistance R 34 other ends, capacitor C 17 other ends.
Described main control chip IC1 adopts the NCP1207 chip.
Fuse F U in this embodiment plays the emergency protection effect in power supply input circuit; NTC is a negative tempperature coefficient thermistor; Dash current when making start is limited in the rated range; The EMC wave filter mainly is for preventing that burst of pulses from disturbing; Alternating current becomes direct current through the full-bridge rectification that electric capacity D1-D8 forms, and is filtered into the smooth direct current power supply by capacitor C 1-C2, and 2 series connection can reach withstand voltage 800Vdc to capacitor C 1 with capacitor C; Capacitor C Y1-CY3 is that high frequency common mode noise provides the filtering bypass channel.Voltage-limiting protection circuit 3 provides voltage-limiting protection for 8 pin of main control chip IC1.Overvoltage crowbar 4 cooperates with main control chip IC1 provides the input end over-voltage protecting function; Power supply was in holding state and reduces switching tube Q1 voltage stress and make the unlikely damage of power supply when input voltage was too high.Leakage inductance absorbing clamp circuit 5, voltage stabilizing feedback circuit 6 are regulated ON time and switch periods and are realized the adjustment of transformer TR power with main control chip IC1 and peripheral circuits CS pipe Q1 thereof, further realize power output end voltage stabilizing and current-limiting protection function.Power supply has three tunnel outputs, and main road V1 leans on the optocoupler feedback circuit to realize voltage stabilizing and overcurrent protection; Bypass output V2 receives each umber of turn of transformer and V1-V3 current affects to realize voltage stabilizing in certain limit; Bypass output V3 can realize accurate voltage stabilizing and current-limiting protection by three-terminal voltage-stabilizing IC2.
The volume of this embodiment is little, high efficiency, reliability is high, antijamming capability is strong, output be short-circuited or during the overvoltage fault power supply can protect automatically, fault is resumed work after disappearing automatically; Can be compatible the input of three-phase and four-line voltage (A, B, C, N) and reach burst of pulses and the anti-interference level of surge level Four; As long as A, B, C has two lines to connect and just can guarantee the power supply operate as normal among the N.
Claims (4)
1. three-phase intelligent ammeter power source special; It is characterized in that it comprises EMC wave filter (1), rectification full-bridge circuit (2), voltage-limiting protection circuit (3), overvoltage crowbar (4), leakage inductance absorbing clamp circuit (5), voltage stabilizing feedback circuit (6), optocoupler feedback circuit (7), fuse F U, capacitor C 5, capacitor C 8-C9, capacitor C Y1-CY3, capacitor C 11-C17, Transient Suppression Diode TVS1-TVS2, voltage stabilizing diode ZD1, diode D9-D10, diode D13-D15, resistance R 4-R10, resistance R 12-R15, resistance R 24, resistance R 30-R34, common mode inductance L2-L4, switching tube Q1, main control chip IC1 and three terminal regulator IC2; The ACL end of AC power links to each other with fuse F U one end; The fuse F U other end links to each other with EMC wave filter (1) one end; EMC wave filter (1) other end links to each other with rectification full-bridge circuit (2); A end in the rectification full-bridge circuit (2) links to each other with capacitor C 1 positive pole, Transient Suppression Diode TVS1 negative pole, resistance R 4 one ends; Resistance R 4, resistance R 5 and resistance R 6 are in series; Capacitor C 1 negative pole, Transient Suppression Diode TVS1 positive pole, resistance R 6 one ends all link to each other with resistance R 7 one ends with a end, the Transient Suppression Diode TVS2 negative pole of capacitor C 2 positive poles, voltage-limiting protection circuit (3); Resistance R 7, resistance R 8 and resistance R 9 are in series, and capacitor C 2 negative poles, Transient Suppression Diode TVS2 positive pole and resistance R 9 one ends all connect power supply.
2. three-phase intelligent ammeter power source special according to claim 1; The b end that it is characterized in that voltage-limiting protection circuit (3) links to each other with 8 pin and the diode D10 negative pole of main control chip IC1; 1,2,4 pin of main control chip IC1 link to each other with optocoupler feedback circuit (7); 3 pin of main control chip IC1 link to each other with resistance R 12 1 ends, and resistance R 12 other ends link to each other with 3 ends of resistance R 14 1 ends, resistance R 24 1 ends and switching tube Q1, resistance R 24 another termination powers; Resistance R 14 other ends link to each other with 1 end, resistance R 13 1 ends of switching tube Q1; Resistance R 13 other ends link to each other with 5 ends of main control chip IC1, and 6 ends of main control chip IC1 link to each other with resistance R 15 1 ends, overvoltage crowbar (4), voltage stabilizing diode DZ1 negative pole, diode D10 positive pole, capacitor C 5 positive poles respectively, and capacitor C 5 negative poles link to each other with optocoupler feedback circuit (7); Resistance R 15 other ends link to each other with diode D9 negative pole, and secondary n2 one end of voltage stabilizing diode DZ1 positive pole and transformer TR links to each other with power supply.
3. three-phase intelligent ammeter power source special according to claim 1; The secondary n2 other end that it is characterized in that transformer TR links to each other with diode D9 positive pole and resistance R 10 1 ends respectively; Resistance R 10 other ends link to each other with optocoupler feedback circuit (7); The c end of voltage-limiting protection circuit (3) links to each other with overvoltage crowbar (4), and overvoltage crowbar (4) links to each other with leakage inductance absorbing clamp circuit (5), and a end of leakage inductance absorbing clamp circuit (5) links to each other with the end of the elementary n1 of transformer TR; The b end of leakage inductance absorbing clamp circuit (5) links to each other with the other end of the elementary n1 of transformer TR and 2 ends of switching tube Q1; The end of the secondary n3 of transformer TR links to each other with diode C13 is anodal, and diode C13 negative pole and common mode inductance L 2 one ends, 8 anodal linking to each other of capacitor C, the common mode inductance L2 other end links to each other with voltage stabilizing feedback circuit (6) with capacitor C 9 positive poles; Voltage stabilizing feedback circuit (6) is parallelly connected in twos with resistance R 30 and resistance R 31; Resistance R 30 1 ends link to each other with power supply V1, resistance R 30 other end ground connection, and the other end of the secondary n3 of transformer TR, capacitor C 8 negative poles, capacitor C 9 negative poles and voltage stabilizing feedback circuit (6) all link to each other with capacitor C Y1 one end, capacitor C Y2 one end, capacitor C Y3 one end; And capacitor C Y1 one end ground connection, another termination power of capacitor C Y1.
4. three-phase intelligent ammeter power source special according to claim 1; The equal ground connection of secondary n4 one end that it is characterized in that the capacitor C Y2 other end, capacitor C 12 negative poles, capacitor C 11 negative poles, transformer TR; Capacitor C 12, resistance R 33, resistance R 32 be parallel connection in twos; Capacitor C 12 positive poles, common mode inductance L3 one end link to each other with power supply V2; The common mode inductance L3 other end and diode D14 negative pole, 11 anodal linking to each other of capacitor C; Diode D14 positive pole links to each other with the secondary n4 other end of transformer TR; TR level of the capacitor C Y3 other end and transformer n5 one end, capacitor C 15 negative poles, 2 ends of three terminal regulator IC2, capacitor C 16 negative poles, resistance R 34 1 ends, the equal ground connection of capacitor C 17 1 ends, TR level of the transformer n5 other end links to each other with diode D15 is anodal, and diode D15 negative pole links to each other with 1 end of capacitor C 15 positive poles, three terminal regulator IC2; 3 ends of three terminal regulator IC2 and common mode inductance L 4 one ends and 16 anodal linking to each other of capacitor C, the common mode inductance L4 other end all links to each other with power supply V3 with resistance R 34 other ends, capacitor C 17 other ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201921015U CN202221440U (en) | 2011-06-09 | 2011-06-09 | Special power supply for three-phase intelligent electricity meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201921015U CN202221440U (en) | 2011-06-09 | 2011-06-09 | Special power supply for three-phase intelligent electricity meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202221440U true CN202221440U (en) | 2012-05-16 |
Family
ID=46043464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201921015U Expired - Fee Related CN202221440U (en) | 2011-06-09 | 2011-06-09 | Special power supply for three-phase intelligent electricity meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202221440U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN112747415A (en) * | 2021-02-03 | 2021-05-04 | 广州市互邻空调设备有限公司 | Air conditioner double-machine switcher |
-
2011
- 2011-06-09 CN CN2011201921015U patent/CN202221440U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
| CN112747415A (en) * | 2021-02-03 | 2021-05-04 | 广州市互邻空调设备有限公司 | Air conditioner double-machine switcher |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201854482U (en) | LED power circuit | |
| CN104795876A (en) | Intelligent charging device based on multi-resonant topology | |
| CN103474965A (en) | Low-cost alternating-current input overvoltage protection circuit and switching power supply | |
| CN102026448A (en) | LED power circuit | |
| CN206164354U (en) | Power lightning protection circuit and power adapter | |
| CN204179660U (en) | Oil drilling spot sensor isolated from power protective device | |
| CN107086545B (en) | A kind of alternating-current charging pile intelligent electric energy meter Switching Power Supply and its working method | |
| CN103872755A (en) | Double power supply seamless switching circuit | |
| CN103022978A (en) | Under-voltage protection circuit for multi-pulse-wave rectifying circuit | |
| CN101635523A (en) | External mining intrinsic safety power supply | |
| CN201515223U (en) | Power supply output overvoltage protective circuit | |
| CN100561816C (en) | Burst current suppressing circuit and use its power supply device | |
| CN107947557A (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN203398768U (en) | Low-cost AC input overvoltage protection circuit and switching power supply | |
| CN101982921B (en) | Universal high-voltage capacitor energy storage module | |
| CN202221440U (en) | Special power supply for three-phase intelligent electricity meter | |
| CN201418038Y (en) | External intrinsic safety power supply for mining use | |
| CN103647469B (en) | A kind of power supply of three-level inverter Switching Power Supply and protective circuit | |
| CN207625441U (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN205693558U (en) | A kind of output overvoltage protection circuit and Switching Power Supply | |
| CN208316588U (en) | A kind of Width funtion adds the Switching Power Supply of surge voltage protection | |
| CN209896934U (en) | Power supply circuit for electric energy meter and three-phase electric meter system | |
| CN203932967U (en) | A kind of coil controller | |
| CN207166127U (en) | Alternating-current charging pile intelligent electric energy meter Switching Power Supply | |
| CN218783631U (en) | Energy-taking power supply module based on high-voltage series compensation platform current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20140609 |