CN210468799U - Single live wire power-taking circuit - Google Patents
Single live wire power-taking circuit Download PDFInfo
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- CN210468799U CN210468799U CN201921692664.3U CN201921692664U CN210468799U CN 210468799 U CN210468799 U CN 210468799U CN 201921692664 U CN201921692664 U CN 201921692664U CN 210468799 U CN210468799 U CN 210468799U
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Abstract
The utility model relates to a single live wire gets electric circuit, include: a triac Q1; the isolation driving circuit is used for switching on or switching off the bidirectional thyristor Q1; the time delay trigger circuit is used for carrying out time delay trigger on the bidirectional thyristor Q1 after the isolation drive is switched on; a current limiting resistor R1; the off-state power taking circuit is used for taking power when the load is disconnected; the on-state power taking circuit is used for taking power within the time specified by the delay trigger circuit after the isolation drive is switched on; and the output voltage stabilizing circuit is respectively connected with the output ends of the off-state power taking circuit and the on-state power taking circuit. The utility model discloses can both obtain the great electric energy of power at the load outage with open the in-process, and have circuit structure simple, the reliability is high, characteristics such as with low costs, for the single live wire intelligent control panel power supply that has long-range wireless control function, realize that traditional machinery single fire switch upgrades to the single fire switch of intelligence.
Description
Technical Field
The utility model relates to an electronic circuit field, concretely relates to single live wire gets electric circuit.
Background
In recent years, with the development of science and technology and the improvement of living standard, especially with the arrival of 5G and internet of things technology, smart homes are moving into our lives. The intelligent home comprises an intelligent switch, an intelligent socket, an intelligent voice sound box, intelligent electric energy monitoring, intelligent security and protection, an intelligent entrance guard, an intelligent air conditioner, an intelligent curtain, an intelligent gas alarm and the like. The intelligent nodes are integrated with wireless communication control chips and systems and connected with the Internet through the gateway, so that a large-scale Internet of things is formed. For a large number of existing homes and offices, intelligent upgrade would be a huge potential market. The traditional switch wiring of wall switch all is a live wire, realizes on-off control through mechanical system. In order to upgrade from a mechanical switch to an intelligent switch on the basis of the existing single fire, the challenge of how to obtain stable and reliable electric energy meeting the power requirement needs to be solved, so that the touch control or remote APP control of a household intelligent panel is realized without changing the existing wiring mode.
The single live wire power supply comprises an off-state power supply circuit and an on-state power supply circuit. When the load is turned off, the off-state electricity taking circuit forms leakage current by connecting a large impedance element in series between the live wire and the load, and takes electricity by utilizing the leakage current. And the on-state electricity taking circuit is responsible for providing electric energy for the whole machine system under the condition that the off-state electricity taking circuit does not work when the load is switched on. The existing on-state power taking scheme is to serially connect a power taking circuit in a load main loop to take power, but the design of power taking circuit parameters is difficult, and the power taking scheme has no adaptability to loads.
SUMMERY OF THE UTILITY MODEL
To the not enough of prior art existence, the utility model aims to provide a circuit is got to single live wire.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a single live wire power-taking circuit comprises:
the bidirectional thyristor Q1 is arranged between the load circuit and the live wire;
the isolation driving circuit is used for switching on or switching off the bidirectional thyristor Q1;
the time delay trigger circuit is connected with a control electrode of the bidirectional thyristor Q1 and is used for carrying out time delay trigger on the Q1 after the isolation driving circuit is switched on;
the current limiting resistor R1 is connected with the delay trigger circuit and is used for limiting current;
the off-state power taking circuit is used for taking power when the load is disconnected;
the input end of the on-state power taking circuit is respectively connected with the current limiting resistor R1 and the isolation driving circuit and is used for taking power within the time specified by the delay trigger circuit after the isolation driving circuit is switched on;
and the output voltage stabilizing circuit is respectively connected with the output ends of the off-state power taking circuit and the on-state power taking circuit.
The isolation driving circuit is an optical coupling isolation circuit or a relay isolation circuit.
The delay trigger circuit is an RC charging circuit or a bidirectional voltage regulator tube circuit.
The off-state electricity taking circuit comprises an AC/DC rectifying circuit and a flyback converter which are connected in sequence.
The on-state power taking circuit comprises a rectifier bridge stack Q3, a capacitor C5 connected in parallel between the output ends of the rectifier bridge stack Q3, a TVS diode TVS2 and a diode D4, wherein the TVS diode TVS2 and the diode D4 are connected in parallel with the capacitor C5.
The resistance value of the current limiting resistor R1 can provide large current on the premise that the current of the on-state power taking circuit is lower than the maximum allowable value.
After the isolation driving circuit is switched on, the voltage at two ends of the bidirectional controllable silicon Q1 is lower than the starting voltage of the off-state power taking circuit.
The utility model has the advantages that:
⑴ the utility model provides a single live wire power-taking circuit which can realize power-taking with larger power in the state of load connection and disconnection and can support the electric energy needed by the wireless communication module and the control system;
⑵ the utility model provides a pair of single live wire gets electric circuit realizes getting the electricity in the on-state through increasing delay trigger circuit, and its size accessible delay circuit parameter of getting electric power is adjusted, and is simple nimble, reliable and stable.
Drawings
FIG. 1 is a schematic diagram of a single live wire power supply circuit.
Fig. 2 is a circuit schematic diagram of the single live wire power circuit embodiment 1.
Fig. 3 is a schematic circuit diagram of the single-live-wire power supply circuit in embodiment 2.
Fig. 4 is a schematic circuit diagram of the single-live-wire power supply circuit in embodiment 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
FIG. 1 is a schematic diagram of an embodiment of a single-live-wire power-taking circuit, which includes a triac Q1, a delay trigger circuit, an off-state power-taking circuit, an isolation driving circuit, and a control signalctlThe power supply circuit comprises an on-state power taking circuit, a current limiting resistor R1, diodes D1 and D2 and a voltage stabilizing circuit.
The utility model discloses a single live wire gets electric circuit, it includes:
the bidirectional thyristor Q1 is arranged between the load circuit and the live wire;
the isolation driving circuit is used for switching on or switching off the bidirectional thyristor Q1;
the time delay trigger circuit is connected with a control electrode of the bidirectional thyristor Q1 and is used for carrying out time delay trigger on the Q1 after the isolation driving circuit is switched on;
the current limiting resistor R1 is connected with the delay trigger circuit and is used for limiting current;
the off-state power taking circuit is used for taking power when the load is disconnected;
the input end of the on-state power taking circuit is respectively connected with the current limiting resistor R1 and the isolation driving circuit and is used for taking power within the time specified by the delay trigger circuit after the isolation driving circuit is switched on;
and the output voltage stabilizing circuit is respectively connected with the output ends of the off-state power taking circuit and the on-state power taking circuit.
The power-taking circuit is divided into off-state power taking and on-state power taking.
Power is obtained in an off state: after the load and the power supply are connected, the control signal is usedctlAt low, the output of the isolation drive circuit Out1 and Out2 are disconnected, and the triac Q1 is turned off. At the moment, the off-state electricity taking circuit is connected to the 220V alternating current power supply through the Load. The input impedance of the off-state power taking circuit is designed to be large, so that the leakage current flowing through the load is ensured to be small, and the misoperation of the load in a standby state is further avoided. The off-state power taking circuit converts input alternating current into low-voltage direct current through the flyback converter and inputs the low-voltage direct current into the voltage stabilizing circuit to supply power to a system. And because the output of the isolation driving circuit is disconnected, the on-state power taking circuit has no electric energy output, and the voltage of the output end is zero. At this time, in order to prevent the current spike impact caused by the direct connection of the off-state power-taking circuit and the on-state power-taking circuit, diodes D1 and D2 are added and are arranged at the positive output ends of the off-state power-taking circuit and the on-state power-taking circuit.
Taking electricity in an on state: when the control signal ctl is high, the output of the isolation drive circuit Out1 and Out2 are on. The on-state power taking circuit is connected to 220V alternating current through the isolation driving output end and the current limiting resistor R1 to start power taking. At the same time, the delay trigger circuit starts to operate. When the delay time is up, the bidirectional thyristor Q1 is triggered to conduct. During the conduction period of Q1, the on-state power-taking circuit has no power input and supplies power to the system through the stored power. Assuming that the current flows from AC220V _ Hot to Com1, the voltage across triac Q1 gradually decreases until it reaches zero as the conduction time progresses. At the moment, the bidirectional thyristor Q1 is cut off again, and as the outputs Out1 and Out2 of the isolation driving circuit are connected, the current flows from Com1 to AC220V _ Hot, the alternating current charges the on-state electricity taking circuit again until the time delay trigger circuit triggers the bidirectional thyristor Q1 to be connected, and the on-state electricity taking circuit stops charging and circulates repeatedly until the time delay trigger circuit triggers the on-state of the bidirectional thyristor Q1 to be connectedctlIs a low off load. The value of the current limiting resistor R1 is lower than the maximum current when the on-state power taking circuit is poweredOn the premise of a large allowable value, a large current is supplied as much as possible. This is mainly based on that the more the charging current is, the more the electric energy that open state gets electric circuit and obtains is just more in the same time, and the system is more reliable and stable more. It should be further noted that, in the charging process of the on-state power-taking circuit, because the value of the current-limiting resistor R1 is small and the input impedance of the on-state power-taking circuit is small, the voltage at the two ends of the triac Q1 is small and lower than the starting voltage value of the operation of the off-state power-taking circuit, so the off-state power-taking circuit does not output electric energy.
In the period from the connection of the isolation driving circuit to the triggering conduction of Q1, the power taking is stopped because the voltage at two ends of the off-state power taking circuit is very small, but the output ends of the on-state power taking circuit, the current limiting resistor R1 and the isolation driving circuit are connected in series in a live wire and a load circuit, and the circuit starts to take power. After a time delay, Q1 is triggered to conduct. After the Q1 is turned on, the on-state power taking circuit has no electric energy input, the system is continuously powered by the stored electric energy until the process is repeated after the next half-wave period, and the like is repeated until the isolation driving circuit is turned off.
The delay trigger circuit can adopt an RC charging circuit or a bidirectional voltage regulator tube circuit and other circuits.
Fig. 2 is a schematic circuit diagram of a single live wire power supply circuit according to embodiment 1 of the present invention. The rectifier bridge stack Q2, the filter capacitor C1, the capacitor C2, the capacitor C3, the diode D1, the diode D2, the diode D3, the resistor R2, the resistor R3, the resistor R4, the power triode T1, the signal triode T2, the transformer and the control circuit form an off-state power-taking circuit. Wherein: the filter capacitor C1 is used for smoothing the rectified high-voltage direct current; the diode D1, the capacitor C2 and the resistor R3 are used for absorbing leakage inductance current generated when the primary side of the transformer is turned off, and the power triode T1 is protected from being broken down and damaged; the resistor R2 is a T1 base current limiting resistor; the resistor R4 and the signal triode T2 form a current-limiting protection circuit; the control circuit adjusts the conducting time of the power triode T1 in real time by sampling the voltage of the transformer control winding, and further stabilizes the voltage of the transformer output winding capacitor C3. The bidirectional optical coupler OP1 and the resistor R5 form an isolation driving circuit which is used for controlling the on-state power taking circuit and the trigger delay circuit. The rectifier bridge Q3, the capacitor C5, the TVS diode TVS2 and the diode D4 form an on-state power taking circuit, wherein the TVS2 plays a role in voltage limiting protection. The output voltage stabilizing circuit consists of a three-terminal voltage stabilizing chip and a noise removing capacitor C4. The delay trigger circuit adopts an RC (resistor-capacitor) charging circuit, one end of the RC charging circuit is connected with the control end of the bidirectional thyristor Q1, and the other end of the RC charging circuit is connected with the node of the on-state power taking circuit and the current-limiting resistor.
The working principle is as follows: in standby, the off-state electricity taking circuit rectifies and filters alternating current voltage generated by leakage current of AC220V _ Hot and Com1 to obtain smooth high-voltage direct current. The flyback converter converts the high-voltage direct current into low-voltage direct current, and the output voltage of the flyback converter is connected to the input end of the regulated voltage through D3 so as to provide stable and sufficient electric energy for the system. When the control signal isctlWhen the voltage is high, the output isolation circuit is connected. The rectifier bridge stack Q3 and the current-limiting resistor R1 are connected between the AC220V _ Hot and the Com1, and the alternating current starts to charge the on-state power-taking circuit. Because the impedances of the rectifier bridge stack Q3 and the current-limiting resistor R1 are small, the voltage between the AC220V _ Hot and the Com1 is lower than the starting voltage of the off-state electricity taking circuit, so that the voltage is in the range ofctlWhen the voltage is high, the off-state power-taking circuit stops working. As the charging progresses, the voltage across the capacitor C gradually increases until the triac Q1 is triggered to conduct. Because the bidirectional triode thyristor Q1 is switched on, the voltage difference between the AC220V _ Hot and the Com1 is rapidly reduced to zero, the rectifier bridge stack Q3 is cut off, the on-state electricity taking circuit stops charging, and the system keeps running through the electric energy stored on the capacitor C5. After triac Q1 triggers on, the current between AC220V _ Hot and Com1 gradually decreases below the holding on current over time until the current reverses and triac Q1 turns off. When the alternating current enters another half-wave state, the alternating current starts to charge the capacitor C5 through the current-limiting resistor R1 and the rectifier bridge stack Q3 due to the cut-off of the bidirectional thyristor Q1 until the voltage at the two ends of the current-limiting resistor R1 continues to charge the capacitor of the delay circuit, the bidirectional thyristor Q1 is triggered to be switched on again, the voltage difference between the AC220V _ Hot and the Com1 is rapidly reduced to zero, the rectifier bridge stack Q3 is cut off, the on-state power taking circuit stops charging, and the system passes through the capacitor C5 to store the voltage differenceThe power maintains operation. Repeatedly circulating untilctlLow, the circuit again enters the standby state.
The parameters of the current limiting resistor R1 and the capacitor C5 are limited by the characteristics of the load on the delay time, the charging power of the on-state power taking circuit and the voltage ripple.
Fig. 3 is a schematic circuit diagram of a single live wire power-taking circuit according to embodiment 2 of the present invention. The design of an isolation transformer is added in the on-state power taking circuit.
Fig. 4 is a schematic circuit diagram of a single live wire power-taking circuit according to embodiment 3 of the present invention. The optical coupling isolation circuit is replaced by a relay isolation circuit.
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.
Claims (7)
1. The utility model provides a circuit is got to single live wire which characterized in that: it includes:
the bidirectional thyristor Q1 is arranged between the load circuit and the live wire;
the isolation driving circuit is used for switching on or switching off the bidirectional thyristor Q1;
the time delay trigger circuit is connected with a control electrode of the bidirectional thyristor Q1 and is used for carrying out time delay trigger on the Q1 after the isolation driving circuit is switched on;
the current limiting resistor R1 is connected with the delay trigger circuit and is used for limiting current;
the off-state power taking circuit is used for taking power when the load is disconnected;
the input end of the on-state power taking circuit is respectively connected with the current limiting resistor R1 and the isolation driving circuit and is used for taking power within the time specified by the delay trigger circuit after the isolation driving circuit is switched on;
and the output voltage stabilizing circuit is respectively connected with the output ends of the off-state power taking circuit and the on-state power taking circuit.
2. The single live wire power-taking circuit according to claim 1, characterized in that: the isolation driving circuit is an optical coupling isolation circuit or a relay isolation circuit.
3. The single live wire power-taking circuit according to claim 1, characterized in that: the delay trigger circuit is an RC charging circuit or a bidirectional voltage regulator tube circuit.
4. The single live wire power-taking circuit according to claim 1, characterized in that: the off-state electricity taking circuit comprises an AC/DC rectifying circuit and a flyback converter which are connected in sequence.
5. The single live wire power-taking circuit according to claim 1, characterized in that: the on-state power taking circuit comprises a rectifier bridge stack Q3, a capacitor C5 connected in parallel between the output ends of the rectifier bridge stack Q3, a TVS diode TVS2 and a diode D4, wherein the TVS diode TVS2 and the diode D4 are connected in parallel with the capacitor C5.
6. The single live wire power-taking circuit according to claim 1, characterized in that: the resistance value of the current limiting resistor R1 can provide large current on the premise that the current of the on-state power taking circuit is lower than the maximum allowable value.
7. The single live wire power-taking circuit according to claim 1, characterized in that: during the charging overcharge of the on-state electricity taking circuit, the voltage at two ends of the bidirectional controllable silicon Q1 is lower than the starting voltage of the off-state electricity taking circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692664.3U CN210468799U (en) | 2019-10-11 | 2019-10-11 | Single live wire power-taking circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921692664.3U CN210468799U (en) | 2019-10-11 | 2019-10-11 | Single live wire power-taking circuit |
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| CN210468799U true CN210468799U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556829A (en) * | 2019-10-11 | 2019-12-10 | 温州贝塔电子科技有限公司 | Single live wire power-taking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556829A (en) * | 2019-10-11 | 2019-12-10 | 温州贝塔电子科技有限公司 | Single live wire power-taking circuit |
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