CN103515802A - Intelligentized switch socket and intelligent switch power strip - Google Patents
Intelligentized switch socket and intelligent switch power strip Download PDFInfo
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- CN103515802A CN103515802A CN201310416220.8A CN201310416220A CN103515802A CN 103515802 A CN103515802 A CN 103515802A CN 201310416220 A CN201310416220 A CN 201310416220A CN 103515802 A CN103515802 A CN 103515802A
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Abstract
The invention relates to an intelligentized switch socket or an intelligent switch power strip, in particular to an intelligent strong current switch system achieved through the advanced circuit design and the communication technology. Phase lines in switches are connected with a load through thyristors which are controlled by the output of an MCU; the MCU receives an instruction through a communication chip, a control signal of the thyristors can be obtained after the instruction is decoded, and whether a strong current connection load is output or not is determined; the thyristors are connected in parallel so as to output a large current; a plurality of output tube pins of the MCU are connected with control ports of the thyristors, and a plurality of strong current switches controlled independently are obtained; when the system is powered on, whether a short circuit occurs or not is detected, if load intervention exists, the system will start strong current output automatically, and if no load intervention exists, the system is free of strong current output; every time when the switches are started, the system has the ZVS/ZCS capacity and has the remote operation capacity.
Description
technical field
Socket and an Intelligent switch socket, the intelligent forceful electric power switching system of particularly utilizing advanced circuit design and the communication technology to realize.Phase line in switch is connected with load through controllable silicon, and controllable silicon is controlled by MCU output.MCU receives instruction by communication chip, obtains silicon controlled control signal after decoding, determines whether to export forceful electric power and connects load and thyristor controlled scheduling, guarantees to switch carrying out when switch activated zero voltage switching or zero current at every turn.System comprises 5 parts: the controllable silicon connection of forceful electric power switch, communications module, power-frequency voltage detection module, load detecting module, MCU control module.Controllable silicon itself is realized High-current output by parallel connection; Many output pins of MCU are connected with SCR control port, realize the forceful electric power switch of a plurality of independent controls; System, in galvanization, can detect whether short circuit, as found short trouble, by MCU, corresponding load branch is isolated; Whether system can detect load access, if any load, gets involved, and system starts forceful electric power output automatically, and as non-loaded access, system is exported without forceful electric power; System possesses remote manipulating ability.
Technical background
Current combined socket and switch and socket, be all to belong to passive product, utilizes technical parts that corresponding interface is connected, thereby realize continuing of civil power.Current design as shown in Figure 1.
Annexation is as follows: ground wire is connected with the top interface of 3 mouthfuls of sockets, and zero line is connected with the left side interface of 3 mouthfuls of sockets, and live wire is connected with the right side interface of 3 mouthfuls of sockets; For 2 mouthfuls of sockets, omitted ground wire, zero line is connected with the left side interface of 2 mouthfuls of sockets, and live wire is connected with the right side interface of 2 mouthfuls of sockets.
After load is connected with combined socket and switch, live wire, zero line, ground wire are realized and being electrically connected to, and have the interchange forceful electric power of 220V between live wire and zero line, thereby drive loaded work piece, and ground wire as required, is realized the defencive function of load and electrical connection.
The shortcoming of conventional method is:
Only provide simple electrical connection function, seldom or any other surcharge cannot be provided;
None-identified load, the excessive circuit that causes of load is damaged;
The moment being connected with electrical network is random, causes larger access current impulse, thereby electrical equipment and electrical network are impacted;
, even be charged, there is potential risk in interface, particularly live wire when not accessing load;
Cannot realize remote control function.
Content of the present invention
The present invention realizes by the following method.
Be illustrated in figure 2 the connected mode of intelligent switch socket, annexation is: ground wire is connected with the top interface of 3 mouthfuls of sockets, and zero line is connected with the left side interface of 3 mouthfuls of sockets, and live wire is connected with intelligent switching control module, is then connected with the right side interface of 3 mouthfuls of sockets; For 2 mouthfuls of sockets, omitted ground wire, zero line is connected with the left side interface of 2 mouthfuls of sockets, and live wire intelligent switching control module is connected with the right side interface of 2 mouthfuls of sockets after connecting.
Operation principle is as follows: after load is connected with combined socket and switch, live wire, zero line, ground wire are realized and being electrically connected to, and have the interchange forceful electric power of 220V between live wire and zero line, thereby drive loaded work piece; The connection of live wire, realizes by intelligent switching control module.Moment that live wire realize to be electrically connected to and accordingly to the isolation of load and fault etc., all by intelligent switching control module, provided.
Be illustrated in figure 3 the schematic diagram of intelligent switch socket, connection relation is: the input of chip IC 1 is connected with the input of twisted-pair feeder/antenna, output is connected with the UART port of MCU, the GPIO port of MCU is connected with transistor T 1 base stage, T1 emitter-base bandgap grading is connected with resistance R 14, T1 collector electrode is connected with SCR control port, AC220 and resistance R 1, R2, R16, one end of SCR1 connects, and reference voltage Vref 1 is through the positive input terminal Vref2 of resistance R 12 access operational amplifier ampl, the positive input terminal of ampl and resistance R 12, R17 connects, the negative input end of ampl and resistance R 11, R13, C2 connects, and ampl output is connected with the ADC input supervisor of MCU, resistance R 1 and resistance R 8, R11 connects, resistance R 2 and resistance R 3, R10 connects, resistance R 5 and resistance R 4, R5, R7, R9 connects, the positive input terminal of operational amplifier amp2 and resistance R 3, R6 connects, the negative input end of amp2 and resistance R 4, R15 and capacitor C 1 connect, the output of amp2 and resistance R 15, capacitor C 1, the negative input end of comparator connects, and a positive input port of comparator is connected with Vref1, and another one positive input port is connected with Vref2, reference voltage Vref 1 and resistance R 6, R7, R12 connects, resistance R 8, R9, R10, R14, R17 ground connection.
Operation principle is as follows: resistance R 1, R8 obtain a proportional sine wave dwindling by civil power AC220V dividing potential drop, by resistance R 11, be input to the negative input port of operational amplifier, reference voltage Vref 1 obtains another one reference voltage Vref 2 through resistance R 12, R17 dividing potential drop, Vref2 provides a DC offset voltage for operational amplifier, and resistance R 11, R13, capacitor C 2 form low pass filter with operational amplifier ampl simultaneously.The output voltage of Ampl is:
(Vref2-AC220*(R8／R1))／R11*R13
Vref2=R17／R12*Vref1
Through ADC conversion, MCU can, under algorithm is supported, find sinusoidal wave zero crossing.
Resistance R 2/R10=R5/R9, the pressure drop of resistance R 16 is amplified, is exported after low-pass filtering by operational amplifier amp2, resistance R 6, R7 are applied to the DC offset voltage of Vref1 on the network of operational amplifier amp2, comparator comp is by the output of operational amplifier and reference voltage Vref 1, Vref2 comparison, obtain two outputs, be input in MCU.
When there is no load, the voltage in resistance R 16 is very little, and the negative input end voltage of comparator is less than Vref1, Vref2, and two outputs of comparator are all high; When having load access, the electric current in resistance R 16 increases, and voltage rises, and the negative input end voltage of comparator is less than Vref1, is greater than Vref2, and two one of outputs are high, and one is low; Work as output short-circuit, or when overload, the pressure drop on SCR increases, and the pressure drop in resistance R 16 synchronously increases, and the negative input end voltage of comparator is greater than Vref1, is greater than Vref2, and two outputs are low simultaneously
Because the pressure drop of SCR under normally state is 0.2～0.4V, therefore, when there is no load access, the pressure drop on R16 is less than 0.1V.
Be illustrated in figure 4 the schematic diagram of many group controllable silicons a plurality of independently large-current electric connecting interfaces of realizing in parallel, connection relation is: the GPI01 port of MCU and transistor T 1, T2, the base stage of T3 connects, transistor T 1, T2, the emitter-base bandgap grading of T3 and resistance R 1, R2, R3 connects, collector electrode respectively with SCR1, SCR2, the control end of SCR3 connects, the GPIO2 port of MCU and transistor T 4, T5, the base stage of T6 connects, transistor T 4, T5, the emitter-base bandgap grading of T6 and resistance R 4, R5, R6 connects, collector electrode respectively with SCR4, SCR5, the control end of SCR6 connects, AC220 and SCR1, SCR2, SCR3, SCR4, SCR5, one end of SCR6 connects, SCR1, SCR2, the other end of SCR3 is connected with out2, SCR4, SCR5, the other end of SCR6 is connected with out1.
Operation principle is as follows: when GPIO1 is output as height, transistor T 1, T2, T3 are driven, and pull-down current causes SCR1, SCR2, SCR3 conducting, and the output voltage of OUT2 is AC220, and output current is that 3 controllable silicons allow electric current sums; When GPIO2 is output as height, transistor T 4, T5, T6 are driven, and pull-down current causes SCR4, SCR5, SCR6 conducting, and the output voltage of OUT1 is AC220, and output current is that 3 controllable silicons allow electric current sums.
Use a GPIO port to drive one group of SCR, can be so that output be synchronous.
A plurality of SCR are in parallel, can be so that the current capacity of single output port strengthens, if the output current of out1 and out2 is respectively the electric current sum of 3 SCR.
Advantage of the present invention is:
Automatically whether identification has load to get involved, and when non-loaded, without forceful electric power, exports;
The large current capacity of can a plurality of controllable silicon parallel connections expanding single electrical connection interface;
Can identify short trouble and isolate for corresponding branch road;
Realize ZVS/ZCS, extend the load appliance life-span, reduce electric network noise;
Remote control function, can carry out by network the remote control of switch;
Support distributed installation, centralized control;
Can be according to initialize program independent operating.
Accompanying drawing explanation.
Fig. 1: traditional socket is electrically connected to
Fig. 2: intelligent socket is electrically connected to
Fig. 3: the schematic diagram of intelligent switch socket
Fig. 4: organize controllable silicon a plurality of independently large-current electric connecting interfaces of realizing in parallel more
Fig. 5: the ZVS/ZCS schematic diagram of switching manipulation
Fig. 6: the transformer that meets UL standard drives intelligent switch socket
Fig. 7: the optocoupler that meets UL standard drives intelligent switch socket
Embodiment
Below in conjunction with drawings and Examples, content of the present invention is described in further detail.
The ZVS/ZCS schematic diagram of switching manipulation as shown in Figure 5,220V AC sine wave has two kinds of frequencies, 50Hz or 60Hz, according to sample frequency and the sampling precision of MCU ZhongADC unit, generally, within a 220V AC cycle, have 100 above sampling pulses, the cycle of sampling pulse is T
sH, through repeatedly sampling and average, obtain maximum and minimum value in one-period.
After many algorithms obtains sinusoidal wave zero crossing, just can carry out at dead-center position the switching of switch, now the voltage at SCR two ends is 0, thereby makes to load on access constantly, can not produce large current impulse.
After the judgement of zero crossing position, need to determine the operating time of ZVS/ZCS.Setting as shown in the figure zero crossing is T0, and the sampling of front and back is respectively TP1 and TN1 ..., consider the time delay in circuit structure, obtain the response of SCR controlled 1 and SCR controlled 2.
Optimal state is centered by sinusoidal wave zero crossing, within the shortest time, realizes and switching, and can not realize in actual applications.
More satisfactory state is the response curve of SCR controlled 1, and corresponding interval between the trailing edge of TP1 and the rising edge of TN1, now the voltage at SCR two ends is very low, almost in ZVS/ZCS best can operating space in.
Acceptable state is the response curve of SCR controlled 1, corresponding interval between the rising edge of TP1 and the trailing edge of TN1, now the voltage at SCR two ends is lower, the switch power consumption of SCR itself and on the impact of electrical network, load in claimed range Nei，Shi Optimum Operation district.
In order to guarantee the proper operation of ZVS/ZCS, need to for following circuit response time, make the adjustment of switch motion starting point, guarantee that action occurs in above operating space.
Operational amplifier amp1 changes for processing time delay and the corresponding phase place of input AC220;
The processing time of ADC in MCU;
The time that MCU running software needs;
Circuit response time from the GPIO of MCU port to the control port of controllable silicon SCR.
The transformer that meets as shown in Figure 6 UL standard drives intelligent switch socket, annexation is: transformer TR1Yuan limit one terminal connecting zero line N_AC, one end is connected with civil power AC220 by resistance R 1, secondary one end ground connection, one end is by the negative input end of resistance R 4 access operational amplifier ampl, reference voltage Vref is connected with resistance R 5, the positive input terminal of operational amplifier and resistance R 5, resistance R 7 connects, resistance R 7 other one end ground connection, capacitor C 2 and resistance R 6 one termination operational amplifier ampl negative input ends, the output of one termination operational amplifier, the ADC input port of the output access MCU of operational amplifier ampl, very new chip IC1 one end and twisted-pair feeder/antenna connects, one end is connected with MCU by UART port, in optocoupler input port, one end is connected with AC220 by R8, one end is connected with out, in output port, one end is connected with VCC voltage, one end and resistance R 9, the positive input terminal of operational amplifier amp2 connects, resistance R 9 other one end ground connection, controllable silicon SCR one termination AC220, another one port meets out, SCR control port connects the secondary of transformer TR2, TR2 another one secondary connecting to neutral line N_AC, TR2Yuan limit one termination VCC, the collector electrode of an other termination transistor T 1, T1 base stage is connected with the GPIO port of MCU, T1 emitter-base bandgap grading is by resistance R 10 ground connection, the negative input end of operational amplifier amp2 is by resistance R 2 ground connection, simultaneously with resistance R 3, capacitor C 1 connects, the output port of amp2 with resistance R 3, capacitor C 1 connects, while is the negative input end of device comp as a comparison, a positive input terminal of comparator comp is connected with reference voltage Vref, the positive input terminal of another one positive input port and operational amplifier ampl connects.
Operation principle is: transformer TR1 is transformed into marginal output by civil power AC220, is input to the negative input end of operational amplifier by resistance R 4.
Operational amplifier ampl positive input terminal voltage=Vref*R7/ (R5+R7)
Transformer TR1 primary current=AC220/R1, sets former limit identical with secondary current, obtains operational amplifier output voltage (Vref*R7/ (R5+R7)-AC220/R1*R4)/R4*R6
ADC in MCU can be converted to digital signal by above-mentioned voltage signal, thereby obtain maximum and the minimum value of AC220, and zero crossing data, but the AC220 of now ADC conversion is through anti-phase, be to be half period the time difference, on not impact of the judgement of zero crossing.
The work of optocoupler OC changes according to load is different.When there is no load, the voltage difference of two inputs of optocoupler OC is very little, and optocoupler OC does not work, and resistance R 9 output voltages are almost nil; When load access and controllable silicon SCR while not working, OC input has larger current flowing, thereby makes in resistance R 9, there is output; When controllable silicon works, the voltage difference 0.2～0.4V of two inputs of optocoupler OC, optocoupler OC does not work, and resistance R 9 output voltages are almost nil; When load cut-off, optocoupler OC input has very large voltage difference, and resistance R 9 output voltages are very high.
Voltage in resistance R 9 meets
When VR9* (1+R3/R2) is always very little, there is no load, comparator is output as height;
When VR9* (1+R3/R2) is greater than Vref*R7/ (R5+R7), while being less than Vref, there is load access (now controlling after SCR conducting the loss of voltage in resistance R 9 by MCU); Comparator output is first 1 high 1 low, is finally overall height;
When load short circuits, on controllable silicon, there is very large voltage difference, the voltage in resistance R 9 is very high, and VR9* (1+R3/R2) is greater than Vref, and comparator is output as entirely low.
The GPIO of MCU is output as when high, the transformer TR2 that flows through of the electric current in transistor T 1, thus drive the flowing of secondary current of TR2, make SCR conducting.
The differentiation of load and accordingly driving, need the built-in corresponding program control of MCU.
The optocoupler that meets as shown in Figure 7 UL standard drives intelligent switch socket, annexation is: transformer TR1Yuan limit one terminal connecting zero line N_AC, one end is connected with civil power AC220 by resistance R 1, secondary one end ground connection, one end is by the negative input end of resistance R 4 access operational amplifier ampl, reference voltage Vref is connected with resistance R 5, the positive input terminal of operational amplifier and resistance R 5, resistance R 7 connects, resistance R 7 other one end ground connection, capacitor C 2 and resistance R 6 one termination operational amplifier ampl negative input ends, the output of one termination operational amplifier, the ADC input port of the output access MCU of operational amplifier ampl, very new chip IC1 one end and twisted-pair feeder/antenna connects, one end is connected with MCU by UART port, in optocoupler input port, one end is connected with AC220 by R8, one end is connected with out, in output port, one end is connected with VCC voltage, one end and resistance R 9, the positive input terminal of operational amplifier amp2 connects, resistance R 9 other one end ground connection, controllable silicon SCR one termination AC220, another one port meets out, SCR control port connects the collector electrode of transistor T 2, T2 base stage and diode D1, capacitor C 3 connects, the input of D1 and resistance R 11, R12 connects, the other terminal connecting zero line of R11, the other termination AC220 of R12, the other terminal connecting zero line N_AC of capacitor C 3, T2 emitter-base bandgap grading is connected with an output port of optocoupler OC2, the another one output port of OC2 is by resistance R 13 ground connection, the collector electrode of transistor T 1 is connected with an input port of OC2, the another one input port of OC2 is connected with VCC, T1 base stage is connected with the GPIO port of MCU, T1 emitter-base bandgap grading is by resistance R 10 ground connection, the negative input end of operational amplifier amp2 is by resistance R 2 ground connection, simultaneously with resistance R 3, capacitor C 1 connects, the output port of amp2 with resistance R 3, capacitor C 1 connects, while is the negative input end of device comp as a comparison, a positive input terminal of comparator comp is connected with reference voltage Vref, the positive input terminal of another one positive input port and operational amplifier ampl connects.
Operation principle is: transformer TR1 is transformed into marginal output by civil power AC220, is input to the negative input end of operational amplifier by resistance R 4.
Operational amplifier ampl positive input terminal voltage=Vref*R7/ (R5+R7)
Transformer TR1 primary current=AC220/R1, sets former limit identical with secondary current, obtains operational amplifier output voltage (Vref*R7/ (R5+R7)-AC220/R1*R4)/R4*R6
ADC in MCU can be converted to digital signal by above-mentioned voltage signal, thereby obtain maximum and the minimum value of AC220, and zero crossing data, but the AC220 of now ADC conversion is through anti-phase, be to be half period the time difference, on not impact of the judgement of zero crossing.
The work of optocoupler OC changes according to load is different.When there is no load, the voltage difference of two inputs of optocoupler OC is very little, and optocoupler OC does not work, and resistance R 9 output voltages are almost nil; When load access and controllable silicon SCR while not working, OC input has larger current flowing, thereby makes in resistance R 9, there is output; When controllable silicon works, the voltage difference 0.2～0.4V of two inputs of optocoupler OC, optocoupler OC does not work, and resistance R 9 output voltages are almost nil; When load cut-off, optocoupler OC input has very large voltage difference, and resistance R 9 output voltages are very high.
Voltage in resistance R 9 meets
When VR9* (1+R3/R2) is always very little, there is no load, comparator is output as height;
When VR9* (1+R3/R2) is greater than Vref*R7/ (R5+R7), while being less than Vref, there is load access (now controlling after SCR conducting the loss of voltage in resistance R 9 by MCU); Comparator output is first 1 high 1 low, is finally overall height;
When load short circuits, on controllable silicon, there is very large voltage difference, the voltage in resistance R 9 is very high, and VR9* (1+R3/R2) is greater than Vref, and comparator is output as entirely low.
The GPIO of MCU is output as when high, and the electric current in transistor T 1, through optocoupler OC2 input port, drives corresponding output port to have current flowing; Electric current, through the after-applied control port to SCR of transistor T 2, makes SCR conducting; The application of transistor T 2, prevents that optical coupling part is because higher operating voltage causes damaging.Resistance R 12, R11, by dividing potential drop, obtain the opereating specification accurately of corresponding Light Coupled Device.
The differentiation of load and accordingly driving, need the built-in corresponding program control of MCU.
In practical application, the judgement of zero crossing can realize by many algorithms, according to selections such as the operational capability of MCU, permissible accuracies; MCU output port GPIO enables constantly, according to the variation of the time delay of circuit various piece, phase place and zero crossing in advance or delay configuration etc. and adjust, or calibrates for each combined socket and switch.
Claims (6)
1. intelligent switch socket and an Intelligent switch socket, the intelligent forceful electric power switching system of particularly utilizing advanced circuit design and the communication technology to realize.Phase line in switch is connected with load through controllable silicon, and controllable silicon is controlled by MCU output.MCU receives instruction by communication chip, obtains silicon controlled control signal after decoding, determines whether to export forceful electric power and connects load and thyristor controlled scheduling, guarantees that zero voltage switching or zero current switch.System comprises 5 parts: the controllable silicon connection of forceful electric power switch, communications module, power-frequency voltage detection module, load detecting module, MCU control module.
2. according to the controllable silicon of the forceful electric power switch of structure described in claims 1, connect, it is characterized by: controllable silicon can a plurality of parallel connections be realized the drivings for large current load, and control is now provided by the single output port of MCU; Controllable silicon can be organized branch road output more and realize for a plurality of unequally loadeds drivings, and control is now provided by the single output port of MCU; Control port can be used optocoupler to realize isolation.
3. according to the communications module of structure described in claims 1, it is characterized by: receive the signal from twisted-pair feeder or antenna, thereby realize, single channel or multichannel silicon controlled switch are controlled.
4. according to the power-frequency voltage of structure described in claims 1, detect module, it is characterized by: detect in real time the voltage waveform of civil power, by sampling, obtain zero crossing, and the peak point in the corresponding moment; The reaction speed of combined circuit and the reaction speed of reverse-blocking tetrode thyristor, determine that silicon controlled control realizes ZVS/ZCS (no-voltage/zero current) and switches; Port can be used optocoupler to realize isolation.
5. according to the load detecting module described in claims 1, it is characterized by: whether detection has load to have and whether exist short trouble automatically; As load exists, by controlled silicon conducting, otherwise remain off state, now output port is safe to people; As there is short circuit, this branch road will not affected the work of other branch roads by automatism isolation, until remove short trouble; Port can be used optocoupler to realize isolation.
6. according to the MCU described in claims 1, control module, it is characterized by: MCU utilizes ADC input to sample for civil power, by internal algorithm, determine zero crossing, according to the Startup time of definite each branch road ZVS/ZCS (zero voltage switching/zero current switches) such as the response time of internal algorithm and external devices; By multi-channel output mouth, control many group controllable silicons; The automatic detection that realizes short trouble algorithm and whether exist for load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310416220.8A CN103515802A (en) | 2013-09-09 | 2013-09-09 | Intelligentized switch socket and intelligent switch power strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310416220.8A CN103515802A (en) | 2013-09-09 | 2013-09-09 | Intelligentized switch socket and intelligent switch power strip |
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| CN103515802A true CN103515802A (en) | 2014-01-15 |
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| CN201310416220.8A Pending CN103515802A (en) | 2013-09-09 | 2013-09-09 | Intelligentized switch socket and intelligent switch power strip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201543A (en) * | 2014-08-26 | 2014-12-10 | 程德 | Power socket load insertion identification method |
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Microwave oven power detection method and system |
| TWI672886B (en) * | 2016-01-19 | 2019-09-21 | 旺玖科技股份有限公司 | System for active detecting alternating current load |
| WO2020006696A1 (en) * | 2018-07-04 | 2020-01-09 | 深圳市锐明技术股份有限公司 | Adc-based detection circuit, and microprocessor-based detection circuit |
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| US20120007555A1 (en) * | 2010-07-07 | 2012-01-12 | Hans Bukow | Smart Wall Plate |
| CN102496816A (en) * | 2011-12-02 | 2012-06-13 | 国网信息通信有限公司 | Intelligent socket |
| CN102570199A (en) * | 2012-01-19 | 2012-07-11 | 东北大学 | Intelligent power utilization socket |
| CN202712619U (en) * | 2012-08-01 | 2013-01-30 | 福建侨汇电子科技有限公司 | Power-limited power supply socket |
| CN102937667A (en) * | 2012-10-29 | 2013-02-20 | 上海电器科学研究院 | Wireless, intelligent and controllable metering equipment used for socket |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120007555A1 (en) * | 2010-07-07 | 2012-01-12 | Hans Bukow | Smart Wall Plate |
| CN102496816A (en) * | 2011-12-02 | 2012-06-13 | 国网信息通信有限公司 | Intelligent socket |
| CN102570199A (en) * | 2012-01-19 | 2012-07-11 | 东北大学 | Intelligent power utilization socket |
| CN202712619U (en) * | 2012-08-01 | 2013-01-30 | 福建侨汇电子科技有限公司 | Power-limited power supply socket |
| CN102937667A (en) * | 2012-10-29 | 2013-02-20 | 上海电器科学研究院 | Wireless, intelligent and controllable metering equipment used for socket |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201543A (en) * | 2014-08-26 | 2014-12-10 | 程德 | Power socket load insertion identification method |
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Microwave oven power detection method and system |
| TWI672886B (en) * | 2016-01-19 | 2019-09-21 | 旺玖科技股份有限公司 | System for active detecting alternating current load |
| WO2020006696A1 (en) * | 2018-07-04 | 2020-01-09 | 深圳市锐明技术股份有限公司 | Adc-based detection circuit, and microprocessor-based detection circuit |
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Application publication date: 20140115 |