Power taking circuit of single-live-wire switch

Abstract

The utility model discloses a single live wire switch power taking circuit, which belongs to the technical field of single live wire power taking, and comprises an off-state power taking circuit and an on-state power taking circuit, a first input end of the off-state power taking circuit is connected with a null line through a lamp, and a second input end is connected with a live wire; the off-state electricity taking circuit comprises a rectifier bridge D4, a filter capacitor C3 circuit, a triode Q1, a flyback transformer and a voltage feedback circuit, and when the lamp is turned off, 220V alternating current passes through the lamp and the rectifier filter circuit, and 320V high-voltage direct current is output and passes through the flyback transformer and a sixth diode D6 to output voltage to supply power to the system. The on-state electricity taking circuit comprises a voltage stabilizing circuit, an alternating current voltage sampling circuit, a voltage comparison circuit and an MOS tube driving circuit; the first input end of the on-state power-taking circuit is connected with a null line through the electronic switch and the lamp, and the second input end is connected with a live wire rear end point; and the first input end and the second input end of the on-state power taking circuit are respectively connected with the MOS circuit module. The utility model provides a high-power on-state power taking current single-live-wire switching circuit which is suitable for high-power lamp illumination.

Description

Technical Field

[0001] The utility model belongs to the technical field of single-live-wire power-taking, and in particular relates to a single-live-wire switch power-taking circuit. Background Art

[0002] At present, most wall switches use single-live wiring (no neutral wire) and realize on-off control through mechanical means. As intelligence becomes more and more popular, the switch control of existing home lights has changed from traditional mechanical switches to smart switches. If you want to install smart home products on switches with single-live wiring, you must modify the circuit. Single-live power supply circuits have appeared in the market, which are difficult to design and maintain, reducing the reliability and stability of the product and are not conducive to large-scale production.

[0003] However, some IC power chips that use ordinary ICs have poor performance, high standby power consumption, and low output current, and can only be used to control low-power energy-saving lamps and LED lamps.

[0004] Some special occasions require the control of high-power lamps, such as bathroom heater switches, conference rooms, and villa lighting. Ordinary thyristor single-fire switches can no longer meet the lighting needs of high-power lamps. Utility Model Content

[0005] The purpose of the utility model is to provide a single-fire power supply module suitable for high-power lamp lighting, to realize a single-fire wire switch circuit with a larger open-state power supply current, so that engineering and technical personnel can develop single-fire switch products more simply and quickly.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions: a single live wire switch power supply circuit, including an off-state power supply circuit for providing the required power to the system when the light is off and an on-state power supply circuit for providing the required power to the system when the light is on, the off-state power supply circuit including a rectifier filter circuit, a transistor Q1, a flyback transformer and a voltage feedback circuit;

[0007] The first input end of the off-state power circuit is connected to the rear end of the neutral line through the lamp, and the second input end of the off-state power circuit is connected to the rear end of the live line; the first output end and the second output end of the off-state power circuit are respectively connected to the two input ends of the rectifier and filter circuit; the output of the rectifier and filter circuit is respectively connected to the transistor Q1 through the start-up circuit, the PWM oscillation circuit, and the flyback transformer; the output voltage of the flyback transformer is adjusted by the voltage feedback circuit, and then outputs a stable voltage through the sixth diode D6 to power the system;

[0008] The open-state power supply circuit includes a voltage stabilization circuit, an AC voltage sampling circuit, a voltage comparison circuit and a MOS tube driving circuit;

[0009] The first input end of the open-state power circuit is connected to the rear end of the neutral line through the electronic switch and the lamp, and the second input end of the open-state power circuit is connected to the rear end of the live line; the first output end and the second output end of the open-state power circuit are connected to the positive electrode of the seventh diode D7 through the eighth diode D8 and the ninth diode D9 respectively, and the cathode of the seventh diode D7 is grounded through the sixth filter capacitor C6;

[0010] The cathodes of the eighth diode D8 and the ninth diode D9 are both connected to the input end of the AC voltage sampling circuit;

[0011] The cathode of the seventh diode D7 is connected to the input end of the voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected to the first input end of the comparison circuit, the second input end of the voltage comparison circuit is connected to the output end of the AC voltage sampling circuit, and the output of the voltage comparison circuit is connected to the MOS tube circuit module;

[0012] The first output terminal and the second output terminal of the on-state power extraction circuit are respectively connected to the MOS circuit module.

[0013] Furthermore, the flyback transformer includes a primary coil, a secondary coil I, and a secondary coil II. The primary coil is connected to the collector of the transistor Q1, and the secondary coil I is used to power the voltage feedback circuit; the output voltage of the secondary coil II is regulated by the voltage feedback circuit, and then outputs a stable voltage through the sixth diode D6 to power the system.

[0014] Preferably, it further comprises a peak voltage elimination circuit, and the peak voltage elimination circuit is arranged at both ends of the primary coil of the flyback transformer.

[0015] Furthermore, the MOS circuit module includes a MOS tube driving circuit, a first MOS tube Q6 and a second MOS tube Q7, the signal input terminal of the MOS tube driving circuit is connected to the output of the voltage comparison circuit, the sources of the first MOS tube Q6 and the second MOS tube Q7 are connected, the gates of the first MOS tube Q6 and the second MOS tube Q7 are both connected to the output of the MOS tube driving circuit, and the drains of the first MOS tube Q6 and the second MOS tube Q7 are respectively connected to the first input terminal and the second input terminal of the open-state power-taking circuit.

[0016] Furthermore, the cathode of the sixth diode D6 is connected to the cathode of the seventh diode.

[0017] Preferably, the rectification and filtering circuit is composed of a bridge rectifier D4 and a third filtering capacitor C3.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows: the application adopts wide-voltage high-frequency MOS tube power supply technology, with micro-ampere standby power consumption, low cost, small size and convenient installation in an 86 box, and is suitable for 1-2kW lamp loads. Compared with the prior art, the application can achieve more than twice the on-state power supply current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The circuit schematic diagram of this application;

[0020] Figure 2 This is the basic application circuit diagram of this product.

[0021] Figure numerals: 1 spike voltage elimination circuit, 2 start-up circuit, 3 PWM oscillation circuit, 4 voltage feedback circuit, 5 AC voltage sampling circuit, 6 voltage stabilization circuit, 7 voltage comparison circuit, 8 MOS tube driving circuit. DETAILED DESCRIPTION

[0022] In order to enable technicians in this field to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] A single live wire switch power taking circuit comprises an off-state power taking circuit for providing the required power to the system in a light-off state and an on-state power taking circuit for providing the required power to the system in a light-on state.

[0025] like Figure 1 As shown, the off-state power-taking circuit includes a rectifier and filter circuit, a transistor Q1, a flyback transformer T1 and a voltage feedback circuit 4. The first input terminal of the off-state power-taking circuit is connected to the rear end of the neutral line through the lamp, and the second input terminal of the off-state power-taking circuit is connected to the rear end of the live line; the first output terminal and the second output terminal of the off-state power-taking circuit are respectively connected to the two input terminals of the rectifier and filter circuit. The rectifier and filter circuit is composed of a bridge rectifier D4 and a third filter capacitor C3. The output of the rectifier and filter circuit is respectively connected to the transistor Q1 through a transistor drive circuit and a flyback transformer. The output voltage of the flyback transformer T1 is adjusted by the voltage feedback circuit 4, and a stable voltage is output through the sixth diode D6 to power the system.

[0026] The transistor drive circuit includes a start-up circuit 2 and a PWM oscillation circuit 3. The start-up circuit 2 is used to start the PWM oscillation circuit 3 to turn on the transistor Q1. The voltage feedback circuit 4 is electrically connected to the PWM oscillation circuit 3. After the transistor Q1 is turned on, the transistor Q1 is turned off and controlled by the PWM oscillation circuit. The PWM oscillation circuit 3 is controlled by the voltage feedback circuit 4.

[0027] The transistor Q1 is turned on, and the flyback transformer T1 is in a state of storing electric energy.

[0028] The transistor Q1 is disconnected, and the flyback transformer T1 is in a state of transmitting electric energy, transmitting the electric energy to the secondary coils I and II.

[0029] The flyback transformer T1 includes a primary coil, a secondary coil I, and a secondary coil II. The primary coil is connected to the collector of the transistor Q1, and the base of the transistor Q1 is connected to the PWM oscillation circuit. The secondary coil I is used to power the voltage feedback circuit 4. After the output voltage of the secondary coil II is adjusted by the voltage feedback circuit 4, it outputs a stable voltage through the sixth diode D6 to power the system.

[0030] It also includes a peak voltage elimination circuit 1, which is arranged at both ends of the primary coil of the flyback transformer T1. When the primary coil is turned off, the leakage inductance energy of the primary coil is absorbed to prevent the breakdown of Q1. Supplementary function.

[0031] Working principle of off state: When turning off the light, the electronic switch is disconnected, and the 220V AC passes through the LAMP bulb (the bulb is not lit), rectified by the rectifier D4, and filtered by the third filter capacitor C3 to form a 320V high-voltage DC power. It passes through the starting circuit to start the PWM oscillation circuit to turn on the transistor Q1, and the flyback transformer T1 including the primary coil begins to store energy. After the transistor Q1 is disconnected, the energy stored in the primary coil is transferred to the secondary coil I and secondary coil II. The secondary coil I provides the working voltage for the voltage feedback circuit.

[0032] The voltage feedback circuit 4 adjusts the output voltage of the secondary coil II to ensure that the secondary coil II outputs a stable voltage. The output voltage of the secondary coil II is VCCA=6V, and the output voltage is output through the sixth diode D6 to power the system.

[0033] Due to the particularity of single-fire power supply, in order to prevent the bulb from appearing dim when turning off the light, the power supply must strictly limit the current of 220V passing through the LAMP bulb. Experiments have shown that when the single-fire power supply circuit design of this application is adopted, when the light is turned off, the standby power consumption of the whole machine is about 4mW. After testing, all 3-watt low-power bulbs did not appear dim.

[0034] When drawing power in the off state, it is necessary to ensure that the leakage current flowing through the load is very small to avoid ghost lights appearing on the lamp load.

[0035] In the open state, power is drawn. The open circuit has no power output and the output voltage is 0.

[0036] like Figure 1 As shown, the open-state power supply circuit includes a voltage stabilizing circuit 6, an AC voltage sampling circuit 5, a voltage comparison circuit 7 and a MOS tube driving circuit 8. The first input end of the open-state power supply circuit is connected to the rear end of the neutral line through an electronic switch and a lamp, and the second input end of the open-state power supply circuit is connected to the rear end of the live line.

[0037] The first output terminal and the second output terminal of the open-state power supply circuit are connected to the anode of the seventh diode D7 through the eighth diode D8 and the ninth diode D9 respectively. The cathode of the seventh diode D7 is grounded through the sixth filter capacitor C6. The cathode of the sixth diode D6 is connected to the cathode of the seventh diode.

[0038] The cathodes of the eighth diode D8 and the ninth diode D9 are both connected to the input end of the AC voltage sampling circuit, the output end of the AC voltage sampling circuit 5 is connected to the second input end of the voltage comparison circuit 7, the cathode of the seventh diode D7 is connected to the input end of the voltage stabilizing circuit 6, the output of the voltage stabilizing circuit 6 is connected to the first input end of the comparison circuit 7, and the output of the voltage comparison circuit 7 is connected to the MOS tube circuit module.

[0039] The MOS circuit module includes a MOS transistor driving circuit 8, a first MOS transistor Q6 and a second MOS transistor Q7.

[0040] The signal input terminal of the MOS tube driving circuit 8 is connected to the output of the voltage comparison circuit 7, the gates of the first MOS tube Q6 and the second MOS tube Q7 are connected to the output of the MOS tube driving circuit, the sources of the first MOS tube Q6 and the second MOS tube Q7 are connected, and the drains of the first MOS tube Q6 and the second MOS tube Q7 are respectively connected to the first output terminal and the second output terminal of the open-state power taking circuit.

[0041] The voltage comparison circuit 7 compares the voltages of the two input terminals, and triggers the voltage comparison circuit to work or not according to the voltage difference between the two input terminals.

[0042] The working principle of the power-taking circuit in the open state is that when the light is turned on, the electronic switch is closed, the LAMP bulb is energized, the LAMP bulb is lit, and the positive and negative voltages of the AC 220V pass through the eighth diode D8 and the ninth diode D9 respectively. At this time, the AC sampling circuit samples the AC voltage. When the collected AC voltage does not reach the voltage at which the trigger voltage comparison circuit works (the collected AC voltage is lower than 10V), the voltage is output through the seventh diode D7, and after filtering by the sixth filter capacitor C6, a stable voltage (8V) is output to power the system (the positive and negative poles of the AC voltage pass through the eighth diode D8 and the ninth diode D9 respectively, and after filtering by the seventh diode D7 and the sixth capacitor C6, a stable voltage is output to power the system). When the collected AC voltage reaches the voltage at which the trigger voltage comparison circuit works (the collected AC voltage is higher than 10V), the trigger voltage comparison circuit drives the MOS drive circuit to drive the first MOS tube Q6 and the second MOS tube Q7 to conduct, preventing the voltage at the rear end of the seventh diode D7 from continuing to rise, so that a stable 8V voltage can be output throughout the entire AC working cycle to power the system.

[0043] like Figure 2 As shown, the basic application circuit of the single-fire switch power supply circuit of the present application is formed.

[0044] Single fire electrical function pin description:

[0045]

[0046] Product application areas:

[0047] Smart home products, single fire switch.

[0048] Single-fire NB-IOT temperature measuring switch and single-fire remote control dimming switch.

[0049] Low power consumption ZigBee, NBIOT, LoRa, 433 / 315 wireless single fire switch.

[0050] Micro power consumption and high efficiency AC-DC and DC-DC modules.

[0051] Single-fire bathroom heater switch is used to control high-power lamps.

[0052] When the product is in use, when the electronic switch is turned off, the off-state power circuit works, the rear end of the neutral line is connected to the bulb and the first input end of the rectifier circuit in sequence, the rear end of the live line is connected to the second input end of the rectifier circuit, the first output end of the rectifier circuit is connected to the DC high voltage input end of the single live wire appliance through an inductor, and the second output end of the rectifier circuit is grounded. At this time, the DC voltage output end of the single live wire appliance outputs a stable voltage to power the system.

[0053] When the electronic switch is closed, the open-state power circuit works, and the rear end of the neutral line is connected to the AC voltage input end of the single-live-wire device through the light bulb and the electronic switch in turn, and the MOS tube is connected between the rear end of the live line and the MOS trigger end of the single-live-wire device. At this time, the DC voltage output end of the single-live-wire device outputs a stable voltage to power the system.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A single live wire switch power supply circuit, comprising an off-state power supply circuit for providing the required power to the system when the light is off and an on-state power supply circuit for providing the required power to the system when the light is on, characterized in that: The off-state power supply circuit includes a rectifier filter circuit, a transistor Q1, a flyback transformer and a voltage feedback circuit; The first input end of the off-state power circuit is connected to the rear end of the neutral line through the lamp, and the second input end of the off-state power circuit is connected to the rear end of the live line; the first output end and the second output end of the off-state power circuit are respectively connected to the two input ends of the rectifier and filter circuit; the output of the rectifier and filter circuit is respectively connected to the transistor Q1 through the start-up circuit, the PWM oscillation circuit, and the flyback transformer; the output voltage of the flyback transformer is adjusted by the voltage feedback circuit, and then outputs a stable voltage through the sixth diode D6 to power the system; The open-state power supply circuit includes a voltage stabilization circuit, an AC voltage sampling circuit, a voltage comparison circuit and a MOS tube driving circuit; The first input end of the open-state power circuit is connected to the rear end of the neutral line through the electronic switch and the lamp, and the second input end of the open-state power circuit is connected to the rear end of the live line; the first output end and the second output end of the open-state power circuit are connected to the positive electrode of the seventh diode D7 through the eighth diode D8 and the ninth diode D9 respectively, and the cathode of the seventh diode D7 is grounded through the sixth filter capacitor C6; The cathodes of the eighth diode D8 and the ninth diode D9 are both connected to the input end of the AC voltage sampling circuit; The cathode of the seventh diode D7 is connected to the input end of the voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected to the first input end of the comparison circuit, the second input end of the voltage comparison circuit is connected to the output end of the AC voltage sampling circuit, and the output of the voltage comparison circuit is connected to the MOS tube circuit module; The first output terminal and the second output terminal of the on-state power extraction circuit are respectively connected to the MOS circuit module.

2. The single live wire switch power supply circuit according to claim 1, characterized in that: The flyback transformer includes a primary coil, a secondary coil I and a secondary coil II. The primary coil is connected to the collector of the transistor Q1, and the secondary coil I is used to power the voltage feedback circuit. After the output voltage of the secondary coil II is adjusted by the voltage feedback circuit, a stable voltage is output through the sixth diode D6 to power the system.

3. The single live wire switch power supply circuit according to claim 2, characterized in that: The invention also comprises a peak voltage elimination circuit, which is arranged at two ends of the primary coil of the flyback transformer.

4. The single live wire switch power supply circuit according to claim 1, characterized in that: The MOS circuit module includes a MOS tube driving circuit, a first MOS tube Q6 and a second MOS tube Q7. The signal input terminal of the MOS tube driving circuit is connected to the output of the voltage comparison circuit, the sources of the first MOS tube Q6 and the second MOS tube Q7 are connected, the gates of the first MOS tube Q6 and the second MOS tube Q7 are both connected to the output of the MOS tube driving circuit, and the drains of the first MOS tube Q6 and the second MOS tube Q7 are respectively connected to the first input terminal and the second input terminal of the open-state power-taking circuit.

5. The single live wire switch power supply circuit according to any one of claims 1 to 4, characterized in that: The cathode of the sixth diode D6 is connected to the cathode of the seventh diode D7.

6. The single live wire switch power supply circuit according to claim 1, characterized in that: The rectification and filtering circuit is composed of a bridge rectifier D4 and a third filtering capacitor C3.

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