CN211909255U - Single live wire switch circuit - Google Patents
Single live wire switch circuit Download PDFInfo
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- CN211909255U CN211909255U CN201922211467.1U CN201922211467U CN211909255U CN 211909255 U CN211909255 U CN 211909255U CN 201922211467 U CN201922211467 U CN 201922211467U CN 211909255 U CN211909255 U CN 211909255U
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Abstract
The utility model relates to a single live wire switch circuit mainly includes diode, on-off switch, power conversion circuit, switch tube unit, drive unit 1, detection circuitry, wherein: the on-off switch comprises a common electromagnetic relay or a mechanical switch, a diode realizes the rectification of turning on and off the lamp for power supply, and then realizes the power supply of a single live wire through a power conversion circuit consisting of a low-power-consumption switching power supply, the driving unit 1 adopts a driving module to drive an MOS (metal oxide semiconductor) tube and a relay in a switching tube unit, the detection circuit comprises a load detection circuit 6 and a zero-crossing detection circuit 7, the load detection circuit 6 realizes the judgment of the existence of the load, and the zero-crossing detection circuit 7 is used for realizing the zero-crossing opening of the relay. The single live wire switch circuit is suitable for large and small power loads, low in loss and low in heat generation, and can adopt ZigBee and other high-current wireless communication. Furthermore, a battery management circuit is added to expand a single-live-wire switching circuit for realizing remote wireless communication such as NB-IoT.
Description
Technical Field
The utility model relates to a single live wire switch circuit especially relates to applicable single live wire switch circuit in big or small power load, small power dissipation, low, can adopt radio communication such as zigBee or NB-IoT of generating heat, belongs to IOT thing networking field.
Background
Currently, single line switches on the market have matured and improved much more than a few years ago, but still have some problems and deficiencies:
1. the load range of the applicable lamp is not wide enough, especially the low-power lamp can flicker or slightly brighten, and the high-power load can generate too high heat.
2. The relay zero-crossing point detection device has no reliable zero-crossing detection function, and can not ensure the relay zero-crossing point to be opened, so that the problem of relay contact adhesion during heavy current load is caused.
3. Without a reliable load detection function, it is not possible to correctly and reliably recognize whether a load is mounted or not or a broken condition.
4. The power supply circuit has the problems of complex structure, low efficiency, insufficient power supply for the subsequent control unit and incapability of perfectly and reliably connecting high-current wireless modules such as ZigBee or NB-IoT.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide one kind and be applicable to big power load, can adopt zigBee, or NB-IoT high current wireless communication agreement, support the load detection function can correctly and reliably discern the load and do not have the installation or the condition of damaging, support zero cross detection function to make the relay zero crossing point open relay contact adhesion problem when effectively preventing heavy current load, accord with the single live wire switch circuit that EMI conduction authentication can be crossed to the electromagnetic compatibility requirement.
The utility model provides a technical scheme that its technical problem adopted is: constructing a single live wire switching circuit, essentially comprising: diodes, on-off switches K1-K3, a power conversion circuit 3, a switch tube unit 2, a driving unit 1, a load detection circuit 6 and a zero-crossing detection circuit 7,
the on-off switches K1-K3 adopt common magnetic relays as driving elements to control the on-off of the lamp load, so that the power of the controllable load is greatly improved. The power supply device adopts the double-MOS switching tube unit 2, the high-efficiency driving unit 1 and the low-power-consumption power conversion circuit 3 to supply power, and has the characteristics of low power consumption, high efficiency, small loss, low heat generation and the like.
The load detection circuit and the zero-crossing detection circuit are adopted, so that the functions of load installation detection and relay zero-crossing point starting are realized.
Furthermore, a battery management circuit is added to expand a single-live-wire switching circuit for realizing remote wireless communication such as NB-IoT.
The further technical scheme is as follows: an EMI filter circuit is added for filtering out harmonic waves generated by a single live wire switch, avoiding disturbance on an alternating current power grid and meeting the EMI conduction certification requirement in the aspect of electromagnetic compatibility, and the EMI filter circuit comprises an inductor and a capacitor.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the single-live-wire switch circuit can adapt to the voltage of a global power grid, meet various load powers (a low-power energy-saving lamp, an LED lamp, a high-power electric appliance and the like) and load types (including resistive loads, capacitive loads and inductive loads, such as incandescent lamps, fluorescent lamps, energy-saving lamps, LED lamps, fluorescent lamps and the like), does not need to be additionally provided with any resistance or capacitance and other 'anti-flash modules', can pass through electromagnetic compatibility conduction authentication, is stable and reliable, simplifies the circuit structure to the maximum extent, improves the output current and voltage range and efficiency of a power taking circuit, reduces the circuit power consumption, reduces the load dark current, and adapts to the current advanced intelligent household wireless communication technology (such as ZigBee, Bluetooth, Z-Wave and other wireless control technologies).
2) The load detection function is supported, and the condition that the load is not installed or damaged can be correctly and reliably identified, so that a corresponding driving circuit cannot be started, and the system power consumption is greatly reduced.
3) The relay zero-crossing detection function is supported, the relay zero-crossing point is ensured to be opened, and the problem of relay contact adhesion in the process of large-current load is effectively prevented.
4) The load detection and zero-crossing detection circuit is simple and easy and low in cost, can be used for 1-to-multiple single-live-wire switches, is stable and reliable in function, low in price and high in practicability.
5) Aiming at a single live wire switch such as NB-IoT and the like requiring power supply of a battery or a super capacitor, the charging current of the charging circuit is automatically adjusted through a hardware circuit according to the external lamp load power, and the phenomenon of flickering of a lamp load in the charging process is avoided.
6) Aiming at a single live wire switch such as NB-IoT (network B-IoT) and the like which needs to be powered by a battery or a super capacitor, the switching on or off of a DC/DC circuit in a battery management circuit is automatically switched through a hardware circuit according to the voltage of a main power supply output end VOUT1 of a power supply conversion circuit 3, so that the energy storage element is enabled to supply power to a rear-stage control unit only under the condition that the single live wire switch is powered on, and the waste of stored electric energy in the transportation or storage process of the single live wire switch is avoided;
drawings
Fig. 1 is a schematic block diagram of one of the single live wire switching circuits of the embodiment of the present invention.
Fig. 2 is a schematic block diagram of a second single-live-wire switch circuit according to an embodiment of the present invention.
Fig. 3 is a schematic block diagram of a single live wire switch circuit according to an embodiment of the present invention.
Fig. 4 is a circuit structure diagram of an embodiment of the single live wire switch circuit of the present invention.
Fig. 5 is a circuit diagram of a second embodiment of the single live wire switch circuit of the present invention.
Fig. 6 is a circuit structure diagram of the third embodiment of the single live wire switch circuit of the present invention.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the accompanying drawings, which are not intended to limit the present invention.
One of the single live wire switching circuits:
as shown in fig. 1, the single live wire switch circuit mainly includes: diode, on-off switch K1~ K3, power conversion circuit 3, switch tube unit 2, drive unit 1, the control unit 4, load detection circuit 6, zero cross detection circuit 7, its basic scheme is:
the on-off switches K1-K3 are relays, and the relays are ordinary electromagnetic relays;
preferred models of the relay include, but are not limited to: HRS3FNH-S-DC24V-A, or HF32 FV-G.
The first load connecting terminal L1 of the single live wire switch is connected with the live wire connecting terminal L of the single live wire switch through the contact switch of the first relay K1 and the switch tube unit 2,
the second load connecting terminal L2 of the single live wire switch is connected with the live wire connecting terminal L of the single live wire switch through the contact switch of the second relay K2 and the switch tube unit 2,
and a third load wiring terminal L3 of the single live wire switch passes through a contact switch of a third relay K3, the switch tube unit 2 and a live wire wiring terminal L of the single live wire switch.
A first load connection terminal L1 of the single live wire switch is connected to a lamp-off power-taking power supply network terminal V0 through a twenty-first diode D21, and is connected to a first power supply input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20;
a second load connection terminal L2 of the single live wire switch is connected to a lamp-off power supply network terminal V0 through a twenty-second diode D22, and is connected to a first power supply input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20;
a third load connection terminal L3 of the single live wire switch is connected to the lamp-off power supply network terminal V0 through a thirteenth diode D23, and is connected to the first power input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20.
The live wire terminal L of the single live wire switch is connected with the power supply network end V1 for turning on the lamp through a first diode D1, and is connected with the second power input end VI2 of the power conversion circuit 3.
The switch tube unit 2 comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors;
a main power output terminal VOUT1 of the power conversion circuit 3 is connected to a power terminal VDD of the control unit 4;
the power supply conversion circuit 3 comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module;
the driving unit 1 is connected with the power conversion circuit 3 through an enable terminal EN and an auxiliary power supply terminal VOUT2, and the enable terminal signal is used to control to switch on or off the second power supply terminal VCC1 for supplying the auxiliary power to the driving unit 1;
the first power supply end VCC of the driving unit 1 is connected with a power supply network end V1 for turning on the lamp;
the driving unit 1 comprises a driving chip or module;
the drain MOS _ D and the control gate MOS _ G of the field effect transistor of the driving unit 1 are respectively connected with the control end FET _ G of the FET drain FET _ D, FET of the switching tube unit 2 and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit 2;
the first group of relay contact output ends L1 of the driving unit 1 are connected with a first load wiring terminal L1 of the single live wire switch;
the second group of relay contact output ends L2 of the driving unit 1 are connected with a second load wiring terminal L2 of the single live wire switch;
and the third group of relay contact output ends L3 of the driving unit 1 is connected with a third load wiring terminal L3 of the single live wire switch.
The driving unit 1 is also connected with a coil of the relay and used for driving the relay coil to be electrified and powered off;
relay output control pins K1_ CTRL, K2_ CTRL, and K2_ CTRL of the control unit 4 are connected to relay control input pins K1_ CTRL, K2_ CTRL, and K2_ CTRL, respectively, of the driving unit 1, and are used to control the relay;
the control unit 4 comprises a main control chip and peripheral elements;
the input end of the zero-crossing detection circuit 7 is connected with a middle node V0 of a series diode and a lamp-turning-off power supply network end V0 which are connected between load wiring terminals L1, L2 and L3 of the single live wire switch and the power supply input end of the power supply conversion circuit 3; the output end of the zero-crossing detection circuit 7 is connected with the control unit 4, and is used for the control unit 4 to obtain a zero-crossing detection signal.
The zero-crossing detection circuit 7 is composed of a triode and a resistor, the input end of the zero-crossing detection circuit 7 is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with a system power Ground (GND), the collecting electrode of the triode is connected with the main power output end (VOUT 1) of the power conversion circuit 3 through the resistor, then a zero-crossing detection signal is taken out from the collecting electrode, the simple and easy low-cost zero-crossing detection circuit is provided through the divider resistor and the triode circuit, the function is stable and reliable, the price is low, and the high-practicability is achieved.
The input end of the load detection circuit 6 is connected with a live wire terminal L connected with the single live wire switch and a cathode of a diode between the driving unit 1 and a power supply network end V1 for turning on the lamp.
A LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6 is connected with the control unit 4 and used for the control unit 4 to obtain a LOAD detection signal;
the load detection circuit 6 is composed of a triode and a resistor, the input end of the load detection circuit 6 is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with a system power Ground (GND), the collecting electrode of the triode is connected with the main power output end (VOUT 1) of the power conversion circuit 3 through the resistor, and then a load detection signal is taken out of the collecting electrode; the simple and easy, low-cost load detection circuit is provided through divider resistance and triode circuit, and the function is reliable and stable, and low price has stronger practicality.
The further technical scheme is as follows: and an EMI filter circuit is added for filtering out harmonic waves generated by the single live wire switch, avoiding disturbance on an alternating current power grid and meeting the EMI conduction certification requirement in the aspect of electromagnetic compatibility, wherein the EMI filter circuit is composed of an inductor and a capacitor, the inductor is connected in series between a live wire connecting terminal of the single live wire switch and the switch tube unit 2, and two ends of the capacitor are respectively connected to a live wire connecting terminal L of the single live wire switch and the other end of the switch tube unit 2.
Furthermore, the number of load circuits of the single live wire switch is increased without correspondingly increasing the load detection circuit 6 and the zero-crossing detection circuit 7, so that the circuit cost of the single live wire switch is effectively reduced.
The following describes in detail the implementation of each part of the circuit with reference to the schematic block diagram and the circuit structure diagram of the embodiment.
As shown in figure 4 of the drawings,
the drive unit 1:
the driving unit 1 comprises a driving chip U2, a fourth diode D4, a fifth diode D5, a sixth diode D6 and a third resistor R3, a first power supply terminal VCC of the driving chip U2 is connected with a live wire terminal L of a single live wire switch through a first diode D1, an anode of the first diode D1 is connected with the live wire terminal L of the single live wire switch, a cathode of the first diode D1 is connected with the first power supply terminal VCC of the driving chip U2 and a power supply network terminal V1 for turning on the lamp,
the first relay control input terminal K1_ CTRL of the driving chip U2 is connected with the anode of the fourth diode D4 and the first relay control output terminal K1_ CTRL of the control unit 4, the second relay control input terminal K2_ CTRL of the driving chip U2 is connected with the anode of the fifth diode D5 and the second relay control output terminal K2_ CTRL of the control unit 4,
a third relay control input terminal K3_ CTRL of the driving chip U2 is connected to an anode of a sixth diode D6 and a third relay control output terminal K3_ CTRL of the control unit 4, a cathode of a fourth diode D4, a cathode of a fifth diode D5, a cathode of a sixth diode D6, and one end of a third resistor R3 are connected to an enable terminal EN of the driving unit 1, an auxiliary power control signal input terminal EN of the switching power chip U1 in the power conversion circuit 3, and an enable terminal EN of the power conversion circuit 3, a second power terminal VCC1 of the driving chip U2 in the driving unit 1 is connected to one end of a third capacitor C3 and an auxiliary power output terminal 2 of the switching power chip U1 in the power conversion circuit 3, and the other end of a third resistor VOUT R3 is connected to a ground terminal GND of the driving chip U2 in the driving unit 1, the other end of the third capacitor C3, The system power ground GND is connected.
A first group of relay coil power supply positive end K1+ and a negative end K1-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a first relay K1 and two ends of a cathode and an anode of an eleventh freewheeling diode D11;
a second group of relay coil power supply positive end K2+ and a negative end K2-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a second relay K2 and two ends of a cathode and an anode of a twelfth freewheeling diode D12;
and a third relay coil power supply positive end K3+ and a negative end K3-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a third relay K3 and two ends of a cathode and an anode of a thirteenth fly-wheel diode D13.
Preferred models of the driving chip U2 in the driving unit 1 include, but are not limited to: XD4024, or XD-KC 024.
Switching tube unit 2:
the switch tube unit 2 is composed of a first MOS tube Q1, a second MOS tube Q2, a first resistor R1 and a second resistor R2, the drain D of the first MOS tube Q1 is connected with the drain MOS _ D of the field effect tube of the driving chip U2 in the control unit 4, the gate G of the first MOS tube Q1 and the gate G of the second MOS tube Q2 are connected with the control gate MOS _ G of the field effect tube of the driving chip U2 in the driving unit 1 through the first resistor R1 and the second resistor R2 respectively, the source S of the first MOS tube Q1 and the source S of the second MOS tube Q2 are connected with a system power ground terminal GND, and the drain D of the first MOS tube Q1 is connected with a live wire terminal L of the single live wire switch.
Preferred types of MOS transistors in the switching tube unit 2 include, but are not limited to: CS100N03B4, IRLR8743PbF, IRLR7843PbF, IRLR7833PbF and the like.
Power conversion circuit 3:
the power conversion circuit 3 is composed of a switching power chip U1, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2, an eleventh capacitor C11, a twelfth capacitor C12, a first voltage suppressor TVS1, a second voltage suppressor TVS2, a third voltage suppressor TVS3, a first inductor L1 and a second inductor L2, a first power input terminal VDD1 of the switching power chip U1 is connected with one end of the first capacitor C1, a cathode of the second voltage suppressor TVS2 and one end of the tenth resistor R9, a lamp turn-off power supply network terminal V0 is connected with the other ends of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3 through a twentieth diode D20, an anode of the second voltage suppressor s2 is connected with one end of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3, and an anode of the second voltage suppressor s2 is connected with a cathode of the TVS3 of the third inductor SW 1 and an external connection terminal SW 1 of the third inductor SW 1, the other end of the first inductor L1 is connected to the cathode of the first voltage suppressor TVS1, one end of the second capacitor C2, the second power input terminal VDD2 of the switching power chip U1, the combined power network terminal VDD2 of the light-on, light-off, power-on, power-off, the cathode of the ninth diode D9, one end of the ninth resistor R9, the anode of the ninth diode D9, the other end of the ninth resistor R9, the cathode of D8, one end of the twelfth capacitor C12, the anode of D8, one end of the eleventh capacitor C11, the anode of the power conversion circuit 3, the first power terminal VCC of the driving chip U2 in the driving unit 1, the power network terminal V1 of the light-on, the anode of the first voltage suppressor TVS1, the anode of the third voltage suppressor TVS3, the other end of the first capacitor C5, the other end of the second capacitor C2, and the ground terminal GND of the switching power chip U5857324 of the first voltage suppressor TVS2, and one end of the GND chip of the switching power chip The other end of the eleventh capacitor C11 and the other end of the twelfth capacitor C12 are connected with a system power supply ground GND;
a main power output end VOUT1 of the switching power supply chip U1 is connected with a main power output end VOUT1 of the power supply conversion circuit 3;
a main power output terminal VOUT1 of the power conversion circuit 3 is further filtered by a filter capacitor C5 and then connected to a power supply terminal VDD of the control unit 4;
an auxiliary power output terminal VOUT2 of the switching power chip U1 is connected with a second power supply terminal VCC1 of a driving chip U2 in the driving unit 1;
an auxiliary power supply control signal input end EN of the switching power supply chip U1 is connected with an enable end EN of the driving unit 1;
the system power ground GND is connected to the ground VSS of the control unit 4 through a second inductor L2.
Preferred models of the switching power chip U1 in the power conversion circuit 3 include, but are not limited to: XD 3390A.
The control unit 4:
the control unit 4 is composed of a main control chip and peripheral elements.
The main control chip in the control unit 4 includes but is not limited to SOC, or CPU, or MCU, or ARM, etc., and the preferred models include but are not limited to: CC2530, or CC2630, or JN5168, or JN5169, or HI2110, etc.
Relay output control pins K1_ CTRL, K2_ CTRL, and K3_ CTRL of the control unit 4 are respectively connected to three sets of relay control input pins K1_ CTRL, K2_ CTRL, and K3_ CTRL of the drive chip U2 in the drive unit 1, so as to control the relay.
A LOAD detection signal input end LOAD _ CHECK of the control unit 4 is connected with a LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6, and is used for the control unit 4 to obtain a LOAD detection signal; the zero-crossing detection signal input end AC _ CHECK of the control unit 4 is connected with the zero-crossing detection signal output end AC _ CHECK of the zero-crossing detection circuit 7, and is used for the control unit 4 to obtain a zero-crossing detection signal.
EMI filter circuit 5:
the EMI filter circuit 5 is composed of a third inductor L3 and a sixth capacitor C6, the third inductor L3 is connected in series between the live wire terminal L of the single live wire switch and the drain D of the second MOS transistor Q2 of the switch tube unit 2, one end of the third inductor L3 and one end of the sixth capacitor C6 are connected to the live wire terminal L of the single live wire switch, the other end of the third inductor L3 is connected to the drain of the second MOS transistor Q2 of the switch tube unit 2, the other end of the sixth capacitor C6 is connected to the drain D of the first MOS transistor Q1 of the switch tube unit 2,
further, the sixth capacitor C6 is preferably: the third inductor L3 is preferably selected from the group consisting of X1 or X2 safety capacitors: a sendust magnetic ring inductor;
furthermore, the type selection of the third inductor L3 and the sixth capacitor C6 in the EMI filter circuit is determined according to the practical application requirements, and it follows the principle that the larger the lamp load power that needs EMI certification, the larger the inductance of the third inductor L3 needs to be, when conduction certification is not needed, the third inductor L3 is directly short-circuited, and the sixth capacitor C6 does not need to be installed.
The load detection circuit 6:
the load detection 6 circuit is composed of a third triode Q3, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21, the base of the third triode Q3 is connected with one end of the twentieth resistor R20 and one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected with the input end of the load detection circuit 6, the cathode of a first diode D1 and the power supply network end V1 are connected between the live wire terminal L of the single live wire switch and the driving unit 1, the lamp is turned on to obtain power, the other end of a twentieth resistor R20 and the emitter of a third triode Q3 are connected with the system power ground end GND, the collector of the third triode Q3 is connected with one end of a nineteenth resistor R19 and the LOAD detection signal output end LOAD _ CHECK, and the other end of the nineteenth resistor R19 is connected with the main power supply output end VOUT1 of the power conversion circuit 3;
the third triode Q3 is an NPN triode or an N-channel MOS tube.
Zero-cross detection circuit 7:
the zero-crossing detection circuit 7 consists of a fourth triode Q4, a fourteenth resistor R14, an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13, the base of a fourth triode Q4 is connected with one end of a twelfth resistor R12 and one end of a thirteenth resistor R13, the other end of the twelfth resistor R12 is connected with one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is connected with the input end of the zero-cross detection circuit 7, the middle node V0 of the serial branch of a twenty-first diode D21 and a twentieth diode D20, and the lamp-turning-off and power-taking power supply network end V0, the other end of the thirteenth resistor R13 and the emitter of the fourth triode Q4 are connected with a system power supply ground end GND, the collector of the fourth triode Q4 is connected with one end of a fourteenth resistor R14 and the zero-cross detection signal output end AC _ CHECK, and the other end of the fourteenth resistor R14 is connected with the main power supply output end VOUT1 of the power conversion circuit 3;
the fourth triode Q4 is an NPN triode or an N-channel MOS tube.
The second single live wire switch circuit:
as shown in fig. 2, the single live wire switch circuit mainly includes: diode, on-off switch K1~ K3, power conversion circuit 3, switch tube unit 2, drive unit 1, the control unit 4, load detection circuit 6, zero cross detection circuit 7, battery management circuit 8, its basic scheme is:
the on-off switches K1-K3 are relays, and the relays are ordinary electromagnetic relays;
preferred models of the relay include, but are not limited to: HRS3FNH-S-DC24V-A, or HF32 FV-G.
A first load connecting terminal L1 of the single live wire switch is connected with a live wire connecting terminal L of the single live wire switch through a contact switch of a first relay K1 and the switch tube unit 2;
a second load connecting terminal L2 of the single live wire switch is connected with a live wire connecting terminal L of the single live wire switch through a contact switch of a second relay K2 and the switch tube unit 2;
and a third load wiring terminal L3 of the single live wire switch passes through a contact switch of a third relay K3, the switch tube unit 2 and a live wire wiring terminal L of the single live wire switch.
A first load connection terminal L1 of the single live wire switch is connected to a lamp-off power-taking power supply network terminal V0 through a twenty-first diode D21, and is connected to a first power supply input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20;
a second load connection terminal L2 of the single live wire switch is connected to a lamp-off power supply network terminal V0 through a twenty-second diode D22, and is connected to a first power supply input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20;
a third load connection terminal L3 of the single live wire switch is connected to the lamp-off power supply network terminal V0 through a thirteenth diode D23, and is connected to the first power input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20.
The live wire terminal L of the single live wire switch is connected with the power supply network end V1 for turning on the lamp through a first diode D1, and is connected with the second power input end VI2 of the power conversion circuit 3.
The switch tube unit 2 comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors;
the power supply conversion circuit 3 comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module;
the driving unit 1 is connected with the power conversion circuit 3 through an enable terminal EN and an auxiliary power supply terminal VOUT2, and the enable terminal signal is used to control to switch on or off the second power supply terminal VCC1 for supplying the auxiliary power to the driving unit 1;
the first power supply end VCC of the driving unit 1 is connected with a power supply network end V1 for turning on the lamp;
the driving unit 1 comprises a driving chip or module;
the drain MOS _ D and the control gate MOS _ G of the field effect transistor of the driving unit 1 are respectively connected with the control end FET _ G of the FET drain FET _ D, FET of the switching tube unit 2 and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit 2;
the first group of relay contact output ends L1 of the driving unit 1 are connected with a first load wiring terminal L1 of the single live wire switch;
the second group of relay contact output ends L2 of the driving unit 1 are connected with a second load wiring terminal L2 of the single live wire switch;
and the third group of relay contact output ends L3 of the driving unit 1 is connected with a third load wiring terminal L3 of the single live wire switch.
The driving unit 1 is also connected with a coil of the relay and used for driving the relay coil to be electrified and disconnected.
Relay output control pins K1_ CTRL, K2_ CTRL, and K2_ CTRL of the control unit 4 are connected to relay control input pins K1_ CTRL, K2_ CTRL, and K2_ CTRL, respectively, of the driving unit 1, and are used to control the relay;
the control unit 4 comprises a main control chip and peripheral elements.
The input end of the zero-crossing detection circuit 7 is connected with a middle node V0 of a series diode and a lamp-turning-off power supply network end V0 which are connected between load wiring terminals L1, L2 and L3 of the single live wire switch and the power supply input end of the power supply conversion circuit 3; the output end of the zero-crossing detection circuit 7 is connected with the control unit 4 and is used for the control unit 4 to obtain a zero-crossing detection signal;
the zero-crossing detection circuit 7 is composed of a triode and a resistor, the input end of the zero-crossing detection circuit 7 is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with a system power Ground (GND), the collecting electrode of the triode is connected with the main power output end (VOUT 1) of the power conversion circuit 3 through the resistor, then a zero-crossing detection signal is taken out from the collecting electrode, the simple and easy low-cost zero-crossing detection circuit is provided through the divider resistor and the triode circuit, the function is stable and reliable, the price is low, and the high-practicability is achieved.
The input end of the load detection circuit 6 is connected with the cathode of the diode connected between the live wire terminal L of the single live wire switch and the driving unit 1, and the power supply network end V1 for turning on the lamp and getting power,
and a LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6 is connected with the control unit 4 and used for the control unit 4 to obtain a LOAD detection signal.
A power input end VIN of the battery management circuit 8 is connected with a lamp-on power-taking and lamp-off power-taking synthetic power supply network end VDD2 of the power conversion circuit 3,
the enable terminal CE of the battery management circuit 8 is directly or indirectly connected with the main power output terminal VOUT1 of the power conversion circuit 3;
the current adjusting end ADJ of the battery management circuit 8 is connected with the cathode of the diode connected between the live wire terminal L of the single live wire switch and the driving unit 1, and a power supply network end V1 for turning on the lamp and getting power;
the output end OUT of the battery management circuit 8 is connected with the power supply end VDD of the control unit 4;
the further technical scheme is as follows: and an EMI filter circuit is added for filtering out harmonic waves generated by the single live wire switch, avoiding disturbance on an alternating current power grid and meeting the EMI conduction certification requirement in the aspect of electromagnetic compatibility, wherein the EMI filter circuit is composed of an inductor and a capacitor, the inductor is connected in series between a live wire wiring terminal L of the single live wire switch and the switch tube unit 2, and two ends of the capacitor are respectively connected to the live wire wiring terminal L of the single live wire switch and the other end of the switch tube unit 2.
Furthermore, the number of load circuits of the single live wire switch is increased without correspondingly increasing the load detection circuit 6 and the zero-crossing detection circuit 7, so that the circuit cost of the single live wire switch is effectively reduced.
The following describes in detail the implementation of each part of the circuit with reference to the schematic block diagram and the circuit structure diagram of the embodiment.
As shown in figure 5 of the drawings,
the drive unit 1:
the driving unit 1 comprises a driving chip U2, a fourth diode D4, a fifth diode D5, a sixth diode D6 and a third resistor R3, a first power supply terminal VCC of the driving chip U2 is connected with a live wire terminal L of a single live wire switch through a first diode D1, an anode of the first diode D1 is connected with the live wire terminal L of the single live wire switch, a cathode of the first diode D1 is connected with the first power supply terminal VCC of the driving chip U2 and a power supply network terminal V1 for turning on the lamp,
the first relay control input terminal K1_ CTRL of the driving chip U2 is connected with the anode of the fourth diode D4 and the first relay control output terminal K1_ CTRL of the control unit 4, the second relay control input terminal K2_ CTRL of the driving chip U2 is connected with the anode of the fifth diode D5 and the second relay control output terminal K2_ CTRL of the control unit 4,
a third relay control input terminal K3_ CTRL of the driving chip U2 is connected to an anode of a sixth diode D6 and a third relay control output terminal K3_ CTRL of the control unit 4, a cathode of a fourth diode D4, a cathode of a fifth diode D5, a cathode of a sixth diode D6, and one end of a third resistor R3 are connected to an enable terminal EN of the driving unit 1, an auxiliary power control signal input terminal EN of the switching power chip U1 in the power conversion circuit 3, and an enable terminal EN of the power conversion circuit 3, a second power terminal VCC1 of the driving chip U2 in the driving unit 1 is connected to one end of a third capacitor C3 and an auxiliary power output terminal 2 of the switching power chip U1 in the power conversion circuit 3, and the other end of a third resistor VOUT R3 is connected to a ground terminal GND of the driving chip U2 in the driving unit 1, the other end of the third capacitor C3, The system power ground GND is connected.
A first group of relay coil power supply positive end K1+ and a negative end K1-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a first relay K1 and two ends of a cathode and an anode of an eleventh freewheeling diode D11;
a second group of relay coil power supply positive end K2+ and a negative end K2-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a second relay K2 and two ends of a cathode and an anode of a twelfth freewheeling diode D12;
and a third relay coil power supply positive end K3+ and a negative end K3-of a driving chip U2 in the driving unit 1 are respectively connected with two ends of a coil of a third relay K3 and two ends of a cathode and an anode of a thirteenth fly-wheel diode D13.
Preferred models of the driving chip U2 in the driving unit 1 include, but are not limited to: XD4024, or XD-KC 024.
Switching tube unit 2:
the switch tube unit 2 is composed of a first MOS tube Q1, a second MOS tube Q2, a first resistor R1 and a second resistor R2, the drain D of the first MOS tube Q1 is connected with the drain MOS _ D of the field effect tube of the driving chip U2 in the control unit 4, the gate G of the first MOS tube Q1 and the gate G of the second MOS tube Q2 are connected with the control gate MOS _ G of the field effect tube of the driving chip U2 in the driving unit 1 through the first resistor R1 and the second resistor R2 respectively, the source S of the first MOS tube Q1 and the source S of the second MOS tube Q2 are connected with a system power ground terminal GND, and the drain D of the first MOS tube Q1 is connected with a live wire terminal L of the single live wire switch.
Preferred types of MOS transistors in the switching tube unit 2 include, but are not limited to: CS100N03B4, IRLR8743PbF, IRLR7843PbF, IRLR7833PbF and the like.
Power conversion circuit 3:
the power conversion circuit 3 is composed of a switching power chip U1, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2, an eleventh capacitor C11, a twelfth capacitor C12, a first voltage suppressor TVS1, a second voltage suppressor TVS2, a third voltage suppressor TVS3, a first inductor L1 and a second inductor L2, a first power input terminal VDD1 of the switching power chip U1 is connected with one end of the first capacitor C1, a cathode of the second voltage suppressor TVS2 and one end of the tenth resistor R9, a lamp turn-off power supply network terminal V0 is connected with the other ends of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3 through a twentieth diode D20, an anode of the second voltage suppressor s2 is connected with one end of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3, and an anode of the second voltage suppressor s2 is connected with a cathode of the TVS3 of the third inductor SW 1 and an external connection terminal SW 1 of the third inductor SW 1, the other end of the first inductor L1 is connected to the cathode of the first voltage suppressor TVS1, one end of the second capacitor C2, the second power input terminal VDD2 of the switching power chip U1, the combined power network terminal VDD2 of the light-on, light-off, power-on, power-off, the cathode of the ninth diode D9, one end of the ninth resistor R9, the anode of the ninth diode D9, the other end of the ninth resistor R9, the cathode of D8, one end of the twelfth capacitor C12, the anode of D8, one end of the eleventh capacitor C11, the anode of the power conversion circuit 3, the first power terminal VCC of the driving chip U2 in the driving unit 1, the power network terminal V1 of the light-on, the anode of the first voltage suppressor TVS1, the anode of the third voltage suppressor TVS3, the other end of the first capacitor C5, the other end of the second capacitor C2, and the ground terminal GND of the switching power chip U5857324 of the first voltage suppressor TVS2, and one end of the GND chip of the switching power chip The other end of the eleventh capacitor C11 and the other end of the twelfth capacitor C12 are connected with a system power supply ground GND;
a main power output end VOUT1 of the switching power supply chip U1 is connected with a main power output end VOUT1 of the power supply conversion circuit 3;
an auxiliary power output terminal VOUT2 of the switching power chip U1 is connected with a second power supply terminal VCC1 of a driving chip U2 in the driving unit 1;
an auxiliary power supply control signal input end EN of the switching power supply chip U1 is connected with an enable end EN of the driving unit 1;
the system power ground GND is connected to the ground VSS of the control unit 4 through a second inductor L2.
Preferred models of the switching power chip U1 in the power conversion circuit 3 include, but are not limited to: XD3390A and the like.
The control unit 4:
the control unit 4 is composed of a main control chip and peripheral elements.
The main control chip in the control unit 4 includes but is not limited to SOC, or CPU, or MCU, or ARM, etc., and the preferred models include but are not limited to: CC2530, or CC2630, or JN5168, or JN5169, or HI2110, etc.
Relay output control pins K1_ CTRL, K2_ CTRL, and K3_ CTRL of the control unit 4 are respectively connected to three sets of relay control input pins K1_ CTRL, K2_ CTRL, and K3_ CTRL of the drive chip U2 in the drive unit 1, so as to control the relay.
A LOAD detection signal input end LOAD _ CHECK of the control unit 4 is connected with a LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6, and is used for the control unit 4 to obtain a LOAD detection signal; the zero-crossing detection signal input end AC _ CHECK of the control unit 4 is connected with the zero-crossing detection signal output end AC _ CHECK of the zero-crossing detection circuit 7, and is used for the control unit 4 to obtain a zero-crossing detection signal.
EMI filter circuit 5:
the EMI filter circuit 5 is composed of a third inductor L3 and a sixth capacitor C6, the third inductor L3 is connected in series between the live wire terminal L of the single live wire switch and the drain D of the second MOS transistor Q2 in the switch tube unit 2, one end of the third inductor L3 and one end of the sixth capacitor C6 are connected to the live wire terminal L of the single live wire switch, the other end of the third inductor L3 is connected to the drain of the second MOS transistor Q2 in the switch tube unit 2, the other end of the sixth capacitor C6 is connected to the drain D of the first MOS transistor Q1 in the switch tube unit 2,
further, the sixth capacitor C6 is preferably: the third inductor L3 is preferably selected from the group consisting of X1 or X2 safety capacitors: a sendust magnetic ring inductor;
furthermore, the type selection of the third inductor L3 and the sixth capacitor C6 in the EMI filter circuit is determined according to the practical application requirements, and it follows the principle that the larger the lamp load power that needs EMI certification, the larger the inductance of the third inductor L3 needs to be, when conduction certification is not needed, the third inductor L3 is directly short-circuited, and the sixth capacitor C6 does not need to be installed.
The load detection circuit 6:
the load detection 6 circuit is composed of a third triode Q3, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21, the base of the third triode Q3 is connected with one end of the twentieth resistor R20 and one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected with the input end of the load detection circuit 6, the cathode of a first diode D1 and the power supply network end V1 are connected between the live wire terminal L of the single live wire switch and the driving unit 1, the lamp is turned on to obtain power, the other end of a twentieth resistor R20 and the emitter of a third triode Q3 are connected with the system power ground end GND, the collector of the third triode Q3 is connected with one end of a nineteenth resistor R19 and the LOAD detection signal output end LOAD _ CHECK, and the other end of the nineteenth resistor R19 is connected with the main power supply output end VOUT1 of the power conversion circuit 3;
the third triode Q3 is an NPN triode or an N-channel MOS tube.
Zero-cross detection circuit 7:
the zero-crossing detection circuit 7 consists of a fourth triode Q4, a fourteenth resistor R14, an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13, the base of a fourth triode Q4 is connected with one end of a twelfth resistor R12 and one end of a thirteenth resistor R13, the other end of the twelfth resistor R12 is connected with one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is connected with the input end of the zero-cross detection circuit 7, the middle node V0 of the serial branch of a twenty-first diode D21 and a twentieth diode D20, and the lamp-turning-off and power-taking power supply network end V0, the other end of the thirteenth resistor R13 and the emitter of the fourth triode Q4 are connected with a system power supply ground end GND, the collector of the fourth triode Q4 is connected with one end of a fourteenth resistor R14 and the zero-cross detection signal output end AC _ CHECK, and the other end of the fourteenth resistor R14 is connected with the main power supply output end VOUT1 of the power conversion circuit 3;
the fourth triode Q4 is an NPN triode or an N-channel MOS tube.
The battery management circuit 8:
the battery management circuit 8 includes a front stage DC/DC circuit 81, a charging circuit 82, an energy storage element BAT1, a charging control circuit 83, a rear stage DC/DC circuit 84,
the energy storage element BAT1 comprises a rechargeable battery or a super capacitor;
the lamp-on power-taking and lamp-off power-taking synthetic power supply network terminal VDD2 of the power conversion circuit 3 is connected with the power input terminal VI of the charging circuit 82 through the pre-stage DC/DC circuit 81.
The input end ADJ of the charging control circuit 83 is connected with a live wire terminal L of the single live wire switch and a cathode of a first diode D1 between the driving unit 1 and a power supply network end V1 for turning on the lamp.
The output terminal of the charging control circuit 83 is connected to the current adjustment terminal PROG of the charging circuit 82,
an output terminal of the charging circuit 82 is connected to the energy storage element BAT1 and charges it to store energy.
The charging control circuit 83 realizes automatic adjustment of the charging current of the charging circuit 82 according to the external lamp load power, namely the voltage of the power supply network terminal V1 when the lamp is turned on.
The energy storage element BAT1 passes through the post-stage DC/DC circuit 84 and then is output to the control unit 4, the enable end CE of the power chip U3 in the pre-stage DC/DC circuit 81 and the enable end CE of the power chip U4 in the post-stage DC/DC circuit 84 are directly or indirectly connected with the main power output end VOUT1 of the power conversion circuit 3, so that the power is output to the NB-IoT or LoRa communication module in the control unit 4 only under the condition that the single live wire switch is powered on, and the stored electric energy is prevented from being wasted in the transportation or storage process by the single live wire switch.
The battery management circuit 8 provides a single-live-wire switching circuit power supply solution which can be used for NB-IoT and other long-distance wireless communication, can adapt to various lamp loads, and has the advantages of low power consumption, simple circuit topology, low cost and easy realization.
Preceding stage DC/DC circuit 81:
the pre-stage DC/DC circuit 81 is mainly used for converting a voltage of a power supply network terminal VDD2 obtained by synthesizing power supply by turning on and off the lamp from the power conversion circuit 3 into a voltage matched with a voltage of the energy storage element BAT1, and the pre-stage DC/DC circuit 81 includes a power supply chip and peripheral elements.
Example (b):
the pre-stage DC/DC circuit 81 is composed of a power supply chip U3, a twenty-fourth resistor R24, a twenty-fifth resistor R25 and a fourth capacitor C4, the power input end VIN of the power chip U3 is connected with the lamp-on power-taking and lamp-off power-taking synthetic power supply network end VDD2 of the power conversion circuit 3, the output end OUT of the power chip U3 is connected with one end of a twenty-fourth resistor R24, one end of a fourth capacitor C4 and a power input end VI of the charging circuit 82, the feedback terminal FB of the power chip U3 is connected with the other end of the twenty-fourth resistor R24 and one end of the twenty-fifth resistor R25, the ground terminal VSS of the power supply chip U3, the other end of the twenty-fifth resistor R25 and the other end of the fourth capacitor C4 are connected with the common ground GND of the system DC power supply, the enable terminal CE of the power supply chip U3 is connected to the enable terminal CE of the power supply chip U4 in the subsequent DC/DC circuit 84.
Preferred types of the power chip U3 in the pre-stage DC/DC circuit 81 include, but are not limited to: ME 6221.
The charge control circuit 83:
the charge control circuit 83 is mainly used for controlling the magnitude of the charge current, and includes an adjusting transistor circuit formed by a transistor or a field effect transistor.
Example (b):
the charging control circuit 83 is composed of a first zener diode Z1, a fifth resistor R5, a fourth resistor R4, a sixth resistor R6 and a fifth triode Q5, the cathode of the first zener diode Z1 and the input end of the charging control circuit 83 are connected with a power-on and power-taking network end V1, the anode of the first zener diode Z1 is connected with one end of the fifth resistor R5 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with a base B of the fifth triode Q5, the other end of the fifth resistor R5 and an emitter E of the fifth triode Q5 are connected with a common GND of a system dc power supply, a collector C of the fifth triode Q5 is connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected with the output end of the charging control circuit 83 and a current adjusting end PROG of the charging circuit 82.
The fifth triode Q5 is an NPN triode or an N-channel field effect transistor.
Charging circuit 82:
the charging circuit 82 mainly charges the energy storage element BAT1, and the charging circuit 82 includes a battery charger chip or a charging circuit 82 formed by discrete devices.
Example (b):
the charging circuit 82 is composed of a twelfth resistor R22, a twenty-third resistor R23, a seventh diode D7, a sixth triode Q6 and a seventh triode Q7, a collector C of the sixth triode Q6 and a base B of the seventh triode Q7 are connected with a current adjusting terminal PROG of the charging circuit 82, an emitter E of the sixth triode Q6, one end of the twenty-third resistor R23 and one end of the twenty-second resistor R22, a power input terminal VI of the charging circuit 82 is connected with a power output terminal of the preceding-stage DC/DC circuit 81, the other end of the thirteenth resistor R23 is connected with an emitter E of the seventh triode Q7 and a base B of the sixth triode Q6, the other end of the twelfth resistor R22, a collector C of the seventh triode Q7 is connected with an anode of the seventh diode D7, and the cathode output terminal of the seventh diode D7 is connected with a cathode output terminal of the charging circuit 82, The positive electrode terminal BAT + of the energy storage element BAT1 is connected.
The sixth triode Q6 and the seventh triode Q7 are PNP triodes.
Rear stage DC/DC circuit 84:
the post-stage DC/DC circuit 84 is mainly used for converting the voltage of the energy storage element BAT1 into a voltage matched with the control unit 4, the post-stage DC/DC circuit 84 comprises a power chip and a peripheral element, and the power chip comprises a DC/DC converter chip or a CMOS low dropout linear regulator chip LDO or a combination thereof.
Example (b):
the rear-stage DC/DC circuit 84 is composed of a power supply chip U4, a seventh resistor R7, an eighth resistor R8, a fifth capacitor C5 and a seventh capacitor C7, a power supply input end VIN of the power supply chip U4 is connected with a positive electrode terminal BAT + of an energy storage element BAT1, an enable end CE of the power supply chip U4 is connected with one end of the seventh resistor R7, one end of the eighth resistor R8 and one end of the seventh capacitor C7, the other end of the seventh resistor R7 is connected with a main power supply output end VOUT1 of a switch power supply chip U1 in the power supply conversion circuit 3, an output end of the power supply chip U4 is connected with one end of the fifth capacitor C5 and a power supply end VDD of the control unit 4, the other end of the fifth capacitor C5, the other end of the seventh capacitor C7, the other end of the eighth resistor R8 and a ground end of the power supply chip U4 are connected with a VSS control unit VSS,
the rear-stage DC/DC circuit 84 realizes automatic switching on or off of the rear-stage DC/DC circuit 84 through a hardware circuit according to the voltage of the main power output terminal VOUT1 of the power conversion circuit 3, and ensures that the energy storage element BAT1 supplies power to the control unit 4 only under the condition that the single live wire switch is powered on.
Preferred models of the power chip U4 in the post-stage DC/DC circuit 84 include, but are not limited to: ME6215, or S-8521, or TPS62120, or HT 7533.
The third single live wire switch circuit:
as shown in fig. 3, the single live wire switch circuit mainly includes: diode, on-off switch K1, power switching circuit 3, switch tube unit 2, drive unit 1, the control unit 4, load detection circuit 6, battery management circuit 8, its basic scheme is:
the on-off switch K1 is a common mechanical switch or a double-control mechanical switch;
when the on-off switch K1 is a common mechanical switch:
a load connecting terminal L1 of the single live wire switch is connected with a live wire connecting terminal L of the single live wire switch through the on-off switch K1, the switch tube unit 2 and the single live wire switch;
a load connection terminal L1 of the single live wire switch is connected to the lamp-off and power-taking power supply network terminal V0 through a twenty-first diode D21, and is connected to the first power input terminal VI1 of the power conversion circuit 3 through a diode or directly.
When the on-off switch K1 is a double-control mechanical switch:
load connecting terminals L1 and L12 of the single live wire switch are connected with a live wire connecting terminal L of the single live wire switch through the on-off switch K1 and the switch tube unit 2;
a first load connection terminal L11 of the single live wire switch is connected to a lamp-off and power-taking power supply network terminal V0 through a twenty-first diode D21, and is connected to a first power supply input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20 or directly;
a second load connection terminal L12 of the single live wire switch is connected to the lamp-off power supply network terminal V0 through a twenty-second diode D22, and is connected to the first power input terminal VI1 of the power conversion circuit 3 through a twentieth diode D20 or directly.
A live wire connecting terminal L of the single live wire switch is connected with a power supply network terminal V1 for turning on a lamp and getting power through a diode, and is also connected with a second power supply input terminal VI2 of the power supply conversion circuit 3;
the switch tube unit 2 comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors;
the power supply conversion circuit 3 comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module;
the first power supply end VCC of the driving unit 1 is connected with a power supply network end V1 for turning on the lamp;
the drain MOS _ D and the control gate MOS _ G of the field effect transistor of the driving unit 1 are respectively connected with the control end FET _ G of the FET drain FET _ D, FET of the switching tube unit 2 and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit 2;
and a relay control input pin of the driving unit 1 is connected with a system power supply ground end GND.
The input end of the load detection circuit 6 is connected with the cathode of the diode connected between the live wire terminal L of the single live wire switch and the driving unit 1, and the power supply network end V1 for turning on the lamp and getting power,
and a LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6 is connected with the control unit 4 and used for the control unit 4 to obtain a LOAD detection signal.
A power input end VIN of the battery management circuit 8 is connected with a lamp-on power-taking and lamp-off power-taking synthetic power supply network end VDD2 of the power conversion circuit 3,
the enable terminal CE of the battery management circuit 8 is directly or indirectly connected with the main power output terminal VOUT1 of the power conversion circuit 3;
the current adjusting end ADJ of the battery management circuit 8 is connected with the cathode of the diode connected between the live wire terminal L of the single live wire switch and the driving unit 1, and a power supply network end V1 for turning on the lamp and getting power;
the output end OUT of the battery management circuit 8 is connected with the power supply end VDD of the control unit 4;
the further technical scheme is as follows: and an EMI filter circuit is added for filtering out harmonic waves generated by the single live wire switch, avoiding disturbance on an alternating current power grid and meeting the EMI conduction certification requirement in the aspect of electromagnetic compatibility, wherein the EMI filter circuit is composed of an inductor and a capacitor, the inductor is connected in series between a live wire wiring terminal L of the single live wire switch and the switch tube unit 2, and two ends of the capacitor are respectively connected to the live wire wiring terminal L of the single live wire switch and the other end of the switch tube unit 2.
Furthermore, the number of load circuits of the single live wire switch is increased without correspondingly increasing the load detection circuit 6, so that the circuit cost of the single live wire switch is effectively reduced.
The following describes in detail the implementation of each part of the circuit with reference to the schematic block diagram and the circuit structure diagram of the embodiment.
As shown in figure 6 of the drawings,
the drive unit 1:
the driving unit 1 comprises a driving chip U2, a first power supply terminal VCC of the driving chip U2 is connected with a live wire connecting terminal L of a single live wire switch through a first diode D1, the anode of the first diode D1 is connected with the live wire connecting terminal L of the single live wire switch, the cathode of the first diode D1 is connected with the first power supply terminal VCC of the driving chip U2 and a power supply network terminal V1 for turning on a lamp,
preferred models of the driving chip U2 in the driving unit 1 include, but are not limited to: XD4024, or XD-KC 024.
Switching tube unit 2:
the switch tube unit 2 is composed of a first MOS tube Q1, a second MOS tube Q2, a first resistor R1 and a second resistor R2, the drain D of the first MOS tube Q1 is connected with the drain MOS _ D of the field effect tube of the driving chip U2 in the control unit 4, the gate G of the first MOS tube Q1 and the gate G of the second MOS tube Q2 are connected with the control gate MOS _ G of the field effect tube of the driving chip U2 in the driving unit 1 through the first resistor R1 and the second resistor R2 respectively, the source S of the first MOS tube Q1 and the source S of the second MOS tube Q2 are connected with a system power ground terminal GND, and the drain D of the first MOS tube Q1 is connected with a live wire terminal L of the single live wire switch.
Preferred types of MOS transistors in the switching tube unit 2 include, but are not limited to: CS100N03B4, IRLR8743PbF, IRLR7843PbF, IRLR7833PbF and the like.
Power conversion circuit 3:
the power conversion circuit 3 is composed of a switching power chip U1, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2, an eleventh capacitor C11, a twelfth capacitor C12, a first voltage suppressor TVS1, a second voltage suppressor TVS2, a third voltage suppressor TVS3, a first inductor L1 and a second inductor L2, a first power input terminal VDD1 of the switching power chip U1 is connected with one end of the first capacitor C1, a cathode of the second voltage suppressor TVS2 and one end of the tenth resistor R9, a lamp turn-off power supply network terminal V0 is connected with the other ends of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3 through a twentieth diode D20, an anode of the second voltage suppressor s2 is connected with one end of the first power input terminal VI1 and the tenth resistor R10 of the power conversion circuit 3, and an anode of the second voltage suppressor s2 is connected with a cathode of the TVS3 of the third inductor SW 1 and an external connection terminal SW 1 of the third inductor SW 1, the other end of the first inductor L1 is connected to the cathode of the first voltage suppressor TVS1, one end of the second capacitor C2, the second power input terminal VDD2 of the switching power chip U1, the combined power network terminal VDD2 for turning on and off the lamp to get power, the cathode of the ninth diode D9, and one end of the ninth resistor R9, the anode of the ninth diode D9, the other end of the ninth resistor R9 are connected to the cathode of D8, one end of the twelfth capacitor C12, the anode of D8, one end of the eleventh capacitor C11 are connected to the second power input terminal VI2 of the power conversion circuit 3, the first power terminal VCC of the driving chip U2 in the driving unit 1, and the power network terminal V1 for turning on and getting power, the anode of the first voltage suppressor TVS1, the anode of the third voltage suppressor TVS3, the other end of the first capacitor C1, the other end of the second capacitor C6342, and the ground terminal V599 of the eleventh capacitor C599 of the first capacitor C599, The other end of the twelfth capacitor C12 is connected to the system power ground GND,
the main power output terminal VOUT1 of the switching power supply chip U1 is connected to the main power output terminal VOUT1 of the power conversion circuit 3,
the system power ground GND is connected to the ground VSS of the control unit 4 through a second inductor L2.
Preferred models of the switching power chip U1 in the power conversion circuit 3 include, but are not limited to: XD3390A and the like.
The control unit 4:
the control unit 4 is composed of a main control chip and peripheral elements.
The main control chip in the control unit 4 includes but is not limited to SOC, or CPU, or MCU, or ARM, etc., and the preferred models include but are not limited to: CC2530, or CC2630, or JN5168, or JN5169, or HI2110, etc.
A LOAD detection signal input end LOAD _ CHECK of the control unit 4 is connected with a LOAD detection signal output end LOAD _ CHECK of the LOAD detection circuit 6, and is used for the control unit 4 to obtain a LOAD detection signal;
EMI filter circuit 5:
the EMI filter circuit 5 is composed of a third inductor L3 and a sixth capacitor C6, the third inductor L3 is connected in series between the live wire terminal L of the single live wire switch and the drain D of the second MOS transistor Q2 of the switch tube unit 2, one end of the third inductor L3 and one end of the sixth capacitor C6 are connected to the live wire terminal L of the single live wire switch, the other end of the third inductor L3 is connected to the drain of the second MOS transistor Q2 of the switch tube unit 2, and the other end of the sixth capacitor C6 is connected to the drain D of the first MOS transistor Q1 of the switch tube unit 2.
Further, the sixth capacitor C6 is preferably: the third inductor L3 is preferably selected from the group consisting of X1 or X2 safety capacitors: provided is a ferro-silicon-aluminum magnetic ring inductor.
Furthermore, the type selection of the third inductor L3 and the sixth capacitor C6 in the EMI filter circuit is determined according to the practical application requirements, and it follows the principle that the larger the lamp load power that needs EMI certification, the larger the inductance of the third inductor L3 needs to be, when conduction certification is not needed, the third inductor L3 is directly short-circuited, and the sixth capacitor C6 does not need to be installed.
The load detection circuit 6:
the LOAD detection 6 circuit is composed of a third triode Q3, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21, wherein the base of the third triode Q3 is connected with one end of the twentieth resistor R20 and one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is connected with a first power supply terminal VCC and a lighting-on power supply network terminal V1 of a driving chip U2 in the driving unit 1, the other end of the twentieth resistor R20 and the emitter of the third triode Q3 are connected with a system power supply ground terminal GND, the collector of the third triode Q3 is connected with one end of the nineteenth resistor R19 and a LOAD detection signal output terminal LOAD _ CHECK, and the other end of the nineteenth resistor R19 is connected with a main power supply output terminal 1 of the VOUT conversion circuit 3.
The third triode Q3 is an NPN triode or an N-channel MOS tube.
The battery management circuit 8:
the battery management circuit 8 includes a front stage DC/DC circuit 81, a charging circuit 82, an energy storage element BAT1, a charging control circuit 83, a rear stage DC/DC circuit 84,
the energy storage element BAT1 includes a rechargeable battery, or a super capacitor.
The lamp-on electricity-taking and lamp-off electricity-taking synthetic power supply network terminal VDD2 of the power conversion circuit 3 is connected with the power input terminal VI of the charging circuit 82 through the pre-stage DC/DC circuit 81.
The input end ADJ of the charging control circuit 83 is connected with a live wire terminal L of the single live wire switch and a cathode of a first diode D1 between the driving unit 1 and a power supply network end V1 for turning on the lamp.
The output terminal of the charging control circuit 83 is connected to the current adjustment terminal PROG of the charging circuit 82,
an output of the charging circuit 82 is connected to the energy storage element BAT1 and charges it to store energy.
The charging control circuit 83 realizes automatic adjustment of the charging current of the charging circuit 82 according to the external lamp load power, namely the voltage of the power supply network terminal V1 when the lamp is turned on.
The energy storage element BAT1 passes through the post-stage DC/DC circuit 84 and then is output to the control unit 4, the enable end CE of the power chip U3 in the pre-stage DC/DC circuit 81 and the enable end CE of the power chip U4 in the post-stage DC/DC circuit 84 are directly or indirectly connected with the main power output end VOUT1 of the power conversion circuit 3, so that the power is output to the NB-IoT or LoRa communication module in the control unit 4 only under the condition that the single live wire switch is powered on, and the stored electric energy is prevented from being wasted in the transportation or storage process by the single live wire switch.
The battery management circuit 8 provides a single-live-wire switching circuit power supply solution which can be used for NB-IoT and other long-distance wireless communication, can adapt to various lamp loads, and has the advantages of low power consumption, simple circuit topology, low cost and easy realization.
Preceding stage DC/DC circuit 81:
the pre-stage DC/DC circuit 81 is mainly used for converting a voltage of a power supply network terminal VDD2 obtained by synthesizing power supply by turning on and off the lamp from the power conversion circuit 3 into a voltage matched with a voltage of the energy storage element BAT1, and the pre-stage DC/DC circuit 81 includes a power supply chip and peripheral elements.
Example (b):
the pre-stage DC/DC circuit 81 is composed of a power supply chip U3, a twenty-fourth resistor R24, a twenty-fifth resistor R25 and a fourth capacitor C4, the power input end VIN of the power chip U3 is connected with the lamp-on power-taking and lamp-off power-taking synthetic power supply network end VDD2 of the power conversion circuit 3, the output end OUT of the power chip U3 is connected with one end of a twenty-fourth resistor R24, one end of a fourth capacitor C4 and a power input end VI of the charging circuit 82, the feedback terminal FB of the power chip U3 is connected with the other end of the twenty-fourth resistor R24 and one end of the twenty-fifth resistor R25, the ground terminal VSS of the power supply chip U3, the other end of the twenty-fifth resistor R25 and the other end of the fourth capacitor C4 are connected with the common ground GND of the system DC power supply, the enable terminal CE of the power supply chip U3 is connected to the enable terminal CE of the power supply chip U4 in the subsequent DC/DC circuit 84.
Preferred types of the power chip U3 in the pre-stage DC/DC circuit 81 include, but are not limited to: ME 6221.
The charge control circuit 83:
the charge control circuit 83 is mainly used for controlling the magnitude of the charge current, and includes an adjusting transistor circuit formed by a transistor or a field effect transistor.
Example (b):
the charging control circuit 83 is composed of a first zener diode Z1, a fifth resistor R5, a fourth resistor R4, a sixth resistor R6 and a fifth triode Q5, the cathode of the first zener diode Z1 and the input end of the charging control circuit 83 are connected with a power-on and power-taking network end V1, the anode of the first zener diode Z1 is connected with one end of the fifth resistor R5 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with a base B of the fifth triode Q5, the other end of the fifth resistor R5 and an emitter E of the fifth triode Q5 are connected with a common GND of a system dc power supply, a collector C of the fifth triode Q5 is connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected with the output end of the charging control circuit 83 and a current adjusting end PROG of the charging circuit 82.
The fifth triode Q5 is an NPN triode or an N-channel field effect transistor.
Charging circuit 82:
the charging circuit 82 mainly charges the energy storage element BAT1, and the charging circuit 82 includes a battery charger chip or a charging circuit 82 formed by discrete devices.
Example (b):
the charging circuit 82 is composed of a twelfth resistor R22, a twenty-third resistor R23, a seventh diode D7, a sixth triode Q6 and a seventh triode Q7, a collector C of the sixth triode Q6 and a base B of the seventh triode Q7 are connected with a current adjusting terminal PROG of the charging circuit 82, an emitter E of the sixth triode Q6, one end of the twenty-third resistor R23 and one end of the twenty-second resistor R22, a power input terminal VI of the charging circuit 82 is connected with a power output terminal of the preceding-stage DC/DC circuit 81, the other end of the thirteenth resistor R23 is connected with an emitter E of the seventh triode Q7 and a base B of the sixth triode Q6, the other end of the twelfth resistor R22, a collector C of the seventh triode Q7 is connected with an anode of the seventh diode D7, and the cathode output terminal of the seventh diode D7 is connected with a cathode output terminal of the charging circuit 82, The positive electrode terminal BAT + of the energy storage element BAT1 is connected.
The sixth triode Q6 and the seventh triode Q7 are PNP triodes.
Rear stage DC/DC circuit 84:
the post-stage DC/DC circuit 84 is mainly used for converting the voltage of the energy storage element BAT1 into a voltage matched with the control unit 4, the post-stage DC/DC circuit 84 comprises a power chip and a peripheral element, and the power chip comprises a DC/DC converter chip or a CMOS low dropout linear regulator chip LDO or a combination thereof.
Example (b):
the rear-stage DC/DC circuit 84 is composed of a power chip U4, a seventh resistor R7, an eighth resistor R8, a fifth capacitor C5, and a seventh capacitor C7, a power input end VIN of the power chip U4 is connected to a positive electrode BAT + of the energy storage element BAT1, an enable end CE of the power chip U4 is connected to one end of the seventh resistor R7, one end of the eighth resistor R8, and one end of the seventh capacitor C7, the other end of the seventh resistor R7 is connected to a main power output end VOUT1 of the power switching circuit 3 of the power chip U1, an output end of the power chip U4 is connected to one end of the fifth capacitor C5 and a power supply end VDD of the control unit 4, the other end of the fifth capacitor C5, the other end of the seventh capacitor C7, the other end of the eighth resistor R8, and a ground end of the power chip U4 are connected to a VSS control unit VSS 4 VSS.
The rear-stage DC/DC circuit 84 realizes automatic switching on or off of the rear-stage DC/DC circuit 84 through a hardware circuit according to the voltage of the main power output terminal VOUT1 of the power conversion circuit 3, and ensures that the energy storage element BAT1 supplies power to the control unit 4 only under the condition that the single live wire switch is powered on.
Preferred types of the power chip U4 in the post-stage DC/DC circuit 84 include, but are not limited to: ME6215, or S-8521, or TPS62120, or HT 7533.
Above, only the specific embodiment of the preferred embodiment of the present invention is not to limit the present invention in any form, although the present invention discloses the preferred embodiment as above, but not to limit the present invention, any skilled person familiar with the art, without departing from the technical solution of the present invention, can make some changes or modifications to the equivalent embodiment of the equivalent change when the technical content disclosed above is available, but all do not depart from the technical solution of the present invention, according to the technical essence of the present invention, namely the technical solution and the utility model concept of any simple modification, equivalent change and modification made to the above embodiments, all still belong to the scope of the technical solution of the present invention.
Claims (10)
1. A single live wire switch circuit, its characterized in that: the power supply comprises a diode, on-off switches (K1, K2, K3) and a power supply conversion circuit (3), a switch tube unit (2), a driving unit (1), a control unit (4), a load detection circuit (6) and a zero-crossing detection circuit (7), wherein the on-off switches (K1, K2 and K3) are relays which are ordinary electromagnetic relays; load wiring terminals (L1, L2 and L3) of the single live wire switch are connected with a live wire wiring terminal (L) of the single live wire switch through the on-off switch (K1, K2 and K3) and the switch tube unit (2); load wiring terminals (L1, L2 and L3) of the single live wire switch are connected with a lamp turning-off and electricity-taking power supply network terminal (V0) through a diode and connected with a first power supply input terminal (VI 1) of the power supply conversion circuit (3) through a diode; a live wire connecting terminal (L) of the single live wire switch is connected with a power supply network terminal (V1) for turning on a lamp and getting power through a diode and is simultaneously connected with a second power supply input terminal (VI 2) of the power supply conversion circuit (3); the switch tube unit (2) comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors; a main power supply output end (VOUT 1) of the power supply conversion circuit (3) is connected with a power supply end (VDD) of the control unit (4); the power supply conversion circuit (3) comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module; the driving unit (1) is connected with the power conversion circuit (3) through an enable terminal (EN) and an auxiliary power supply terminal (VOUT 2), and the enable terminal signal is used for controlling the connection or disconnection of an auxiliary power supply to a second power supply terminal (VCC 1) of the driving unit (1); a first power supply end (VCC) of the driving unit (1) is connected with a power supply network end (V1) for turning on the lamp and getting power; the drive unit (1) comprises a drive chip or module; the drain electrode (MOS _ D) and the control grid electrode (MOS _ G) of the field effect transistor of the driving unit (1) are respectively connected with the drain electrode (FET _ D) and the control end (FET _ G) of the FET of the switching tube unit (2) and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit (2); the driving unit (1) is also connected with the relay and used for driving the relay coil to be electrified and powered off; the relay output control pin of the control unit (4) is respectively connected with the relay control input pin of the driving unit (1) and is used for realizing the control of the relay; the control unit (4) comprises a main control chip and peripheral elements, wherein the main control chip in the control unit (4) comprises an SOC (system on chip), or a CPU (central processing unit), or an MCU (micro control unit), or an ARM (advanced RISC machine); the input end of the zero-crossing detection circuit (7) is connected with a middle node of a series diode connected between a load wiring terminal (L1, L2 and L3) of the single live wire switch and the power input end of the power conversion circuit (3) and a lamp-turning-off power-taking power supply network end (V0); the output end of the zero-crossing detection circuit (7) is connected with the control unit (4) and used for the control unit (4) to obtain a zero-crossing detection signal; the zero-crossing detection circuit (7) is composed of a triode and a resistor, the input end of the zero-crossing detection circuit (7) is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with the grounding end (GND) of a system power supply, the collecting electrode of the triode is connected with the main power supply output end (VOUT 1) of the power supply conversion circuit (3) through the resistor, and then a zero-crossing detection signal is taken out from the collecting electrode; the input end of the load detection circuit (6) is connected with a cathode of a diode connected between a live wire connecting terminal (L) of the single live wire switch and the driving unit (1) and a power supply network end (V1) for turning on the lamp and getting power; a LOAD detection signal output end (LOAD _ CHECK) of the LOAD detection circuit (6) is connected with the control unit (4) and used for the control unit (4) to obtain a LOAD detection signal; load detection circuit (6) comprise triode and resistance, the input of load detection circuit (6) is connected with the triode base after series resistance partial pressure, and the projecting pole and the system power grounding terminal (GND) of triode are connected, and the collecting electrode of triode passes through resistance and is connected with main power output end (VOUT 1) of power converting circuit (3), then takes out load detection signal from the collecting electrode.
2. A single live wire switch circuit, its characterized in that: the power supply comprises diodes, on-off switches (K1, K2, K3) and a power supply conversion circuit (3), a switch tube unit (2), a driving unit (1), a control unit (4), a load detection circuit (6), a zero-crossing detection circuit (7) and a battery management circuit (8), wherein the on-off switches (K1, K2 and K3) are relays which are ordinary electromagnetic relays; load wiring terminals (L1, L2 and L3) of the single live wire switch are connected with a live wire wiring terminal (L) of the single live wire switch through the on-off switch (K1, K2 and K3) and the switch tube unit (2); load wiring terminals (L1, L2 and L3) of the single live wire switch are connected with a lamp turning-off and electricity-taking power supply network terminal (V0) through a diode and connected with a first power supply input terminal (VI 1) of the power supply conversion circuit (3) through a diode; a live wire connecting terminal (L) of the single live wire switch is connected with a power supply network terminal (V1) for turning on a lamp and getting power through a diode and is simultaneously connected with a second power supply input terminal (VI 2) of the power supply conversion circuit (3); the switch tube unit (2) comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors; the power supply conversion circuit (3) comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module; the driving unit (1) is connected with the power conversion circuit (3) through an enable terminal (EN) and an auxiliary power supply terminal (VOUT 2), and the enable terminal signal is used for controlling the connection or disconnection of an auxiliary power supply to a second power supply terminal (VCC 1) of the driving unit (1); a first power supply end (VCC) of the driving unit (1) is connected with a power supply network end (V1) for turning on the lamp and getting power; the drive unit (1) comprises a drive chip or module; the drain electrode (MOS _ D) and the control grid electrode (MOS _ G) of the field effect transistor of the driving unit (1) are respectively connected with the drain electrode (FET _ D) and the control end (FET _ G) of the FET of the switching tube unit (2) and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit (2); the driving unit (1) is also connected with the relay and used for driving the relay coil to be electrified and powered off; the relay output control pin of the control unit (4) is respectively connected with the relay control input pin of the driving unit (1) and is used for realizing the control of the relay; the control unit (4) comprises a main control chip and peripheral elements, wherein the main control chip in the control unit (4) comprises an SOC (system on chip), or a CPU (central processing unit), or an MCU (micro control unit), or an ARM (advanced RISC machine); the input end of the zero-crossing detection circuit (7) is connected with a middle node of a series diode connected between a load wiring terminal (L1, L2 and L3) of the single live wire switch and the power input end of the power conversion circuit (3) and a lamp-turning-off power-taking power supply network end (V0); the output end of the zero-crossing detection circuit (7) is connected with the control unit (4) and used for the control unit (4) to obtain a zero-crossing detection signal; the zero-crossing detection circuit (7) is composed of a triode and a resistor, the input end of the zero-crossing detection circuit (7) is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with the grounding end (GND) of a system power supply, the collecting electrode of the triode is connected with the main power supply output end (VOUT 1) of the power supply conversion circuit (3) through the resistor, and then a zero-crossing detection signal is taken out from the collecting electrode; the input end of the load detection circuit (6) is connected with a cathode of a diode connected between a live wire connecting terminal (L) of the single live wire switch and the driving unit (1) and a power supply network end (V1) for turning on the lamp and getting power; a LOAD detection signal output end (LOAD _ CHECK) of the LOAD detection circuit (6) is connected with the control unit (4) and used for the control unit (4) to obtain a LOAD detection signal; the load detection circuit (6) is composed of a triode and a resistor, the input end of the load detection circuit (6) is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with the grounding end (GND) of a system power supply, the collecting electrode of the triode is connected with the main power supply output end (VOUT 1) of the power supply conversion circuit (3) through the resistor, and then a load detection signal is taken out of the collecting electrode; a power supply input end (VIN) of the battery management circuit (8) is connected with a lamp-on electricity-taking and lamp-off electricity-taking synthetic power supply network end (VDD 2) of the power supply conversion circuit (3), and an enabling end (CE) of the battery management circuit (8) is directly or indirectly connected with a main power supply output end (VOUT 1) of the power supply conversion circuit (3); the current adjusting end (ADJ) of the battery management circuit (8) is connected with a live wire connecting terminal (L) connected with the single live wire switch and the cathode of the diode between the driving unit (1) and a power supply network end (V1) for turning on the lamp and getting power; the output end (OUT) of the battery management circuit (8) is connected with the power supply end (VDD) of the control unit (4).
3. A single live wire switch circuit, its characterized in that: the intelligent control circuit comprises a diode, an on-off switch (K1), a power supply conversion circuit (3), a switch tube unit (2), a driving unit (1), a control unit (4), a load detection circuit (6) and a battery management circuit (8), wherein the on-off switch (K1) is a common mechanical switch or a double-control mechanical switch; a load connecting terminal (L1) of the single live wire switch is connected with a live wire connecting terminal (L) of the single live wire switch through the on-off switch (K1), the switch tube unit (2) and the single live wire switch; a load wiring terminal (L1) of the single live wire switch is connected with a lamp-turning-off and electricity-taking power supply network terminal (V0) through a diode, and is connected with a first power supply input terminal (VI 1) of the power supply conversion circuit (3) through the diode or directly; a live wire connecting terminal (L) of the single live wire switch is connected with a power supply network terminal (V1) for turning on a lamp and getting power through a diode and is simultaneously connected with a second power supply input terminal (VI 2) of the power supply conversion circuit (3); the switch tube unit (2) comprises one or two MOS tubes, and the MOS tubes are low-internal-resistance N-channel MOSFET field effect transistors; the power supply conversion circuit (3) comprises a switching power supply chip and peripheral elements, wherein the switching power supply chip comprises a micro-power consumption power supply chip or module; a first power supply end (VCC) of the driving unit (1) is connected with a power supply network end (V1) for turning on the lamp and getting power; the drive unit (1) comprises a drive chip or module; the drain electrode (MOS _ D) and the control grid electrode (MOS _ G) of the field effect transistor of the driving unit (1) are respectively connected with the drain electrode (FET _ D) and the control end (FET _ G) of the FET of the switching tube unit (2) and are used for controlling the conduction and the cut-off of the MOS transistor in the switching tube unit (2); a relay control input pin of the driving unit (1) is connected with a system power supply ground terminal (GND); the control unit (4) comprises a main control chip and peripheral elements, wherein the main control chip in the control unit (4) comprises an SOC (system on chip), or a CPU (central processing unit), or an MCU (micro control unit), or an ARM (advanced RISC machine); the input end of the load detection circuit (6) is connected with a cathode of a diode connected between a live wire connecting terminal (L) of the single live wire switch and the driving unit (1) and a power supply network end (V1) for turning on the lamp and getting power; a LOAD detection signal output end (LOAD _ CHECK) of the LOAD detection circuit (6) is connected with the control unit (4) and used for the control unit (4) to obtain a LOAD detection signal; the load detection circuit (6) is composed of a triode and a resistor, the input end of the load detection circuit (6) is connected with the base electrode of the triode after being subjected to voltage division through a series resistor, the emitting electrode of the triode is connected with the grounding end (GND) of a system power supply, the collecting electrode of the triode is connected with the main power supply output end (VOUT 1) of the power supply conversion circuit (3) through the resistor, and then a load detection signal is taken out of the collecting electrode; a power supply input end (VIN) of the battery management circuit (8) is connected with a lamp-on electricity-taking and lamp-off electricity-taking synthetic power supply network end (VDD 2) of the power supply conversion circuit (3), and an enabling end (CE) of the battery management circuit (8) is directly or indirectly connected with a main power supply output end (VOUT 1) of the power supply conversion circuit (3); the current adjusting end (ADJ) of the battery management circuit (8) is connected with a live wire connecting terminal (L) connected with the single live wire switch and the cathode of the diode between the driving unit (1) and a power supply network end (V1) for turning on the lamp and getting power; the output end (OUT) of the battery management circuit (8) is connected with the power supply end (VDD) of the control unit (4).
4. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: the LOAD detection circuit (6) is composed of a third triode (Q3), a nineteenth resistor (R19), a twentieth resistor (R20) and a twenty-first resistor (R21), the base electrode of the third triode (Q3) is connected with one end of the twentieth resistor (R20) and one end of the twenty-first resistor (R21), the other end of the twenty-first resistor (R21) is connected with the input end of the LOAD detection circuit (6), the cathode of a diode connected between a live wire connecting terminal (L) of the single live wire switch and the driving unit (1) and a power supply network end (V1) for turning on the lamp are connected, the other end of the twentieth resistor (R20) and the emitter electrode of the third triode (Q3) are connected with a system power grounding end (GND), the collector electrode of the third triode (Q3) is connected with one end of the nineteenth resistor (R19) and a LOAD detection signal output end (LOAD _ CHECK), the other end of the nineteenth resistor (R19) is connected with a main power supply output end (VOUT 1) of the power supply conversion circuit (3); the third triode (Q3) is an NPN triode or an N-channel MOS tube.
5. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: the zero-crossing detection circuit (7) is composed of a fourth triode (Q4), a fourteenth resistor (R14), an eleventh resistor (R11), a twelfth resistor (R12) and a thirteenth resistor (R13), the base of the fourth triode (Q4) is connected with one end of the twelfth resistor (R12) and one end of the thirteenth resistor (R13), the other end of the twelfth resistor (R12) is connected with one end of the eleventh resistor (R11), the other end of the eleventh resistor (R11) is connected with the input end of the zero-crossing detection circuit (7), the middle node of a series diode connected between the load connection terminals (L1, L2 and L3) of the single-live wire switch and the power input end of the power conversion circuit (3), and a power supply network end (V0) of the power-taking switch, the other end of the thirteenth resistor (R13) and the emitter of the fourth triode (Q4) are connected with a system Ground (GND), a collector of the fourth triode (Q4) is connected with one end of a fourteenth resistor (R14) and the zero-crossing detection signal output end (AC _ CHECK), and the other end of the fourteenth resistor (R14) is connected with a main power supply output end (VOUT 1) of the power supply conversion circuit (3); the fourth triode (Q4) is an NPN triode or an N-channel MOS tube.
6. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: the power supply conversion circuit (3) is composed of a switching power supply chip (U1), a ninth resistor (R9), a tenth resistor (R10), a first capacitor (C1), a second capacitor (C2), an eleventh capacitor (C11), a twelfth capacitor (C12), a first voltage suppressor (TVS 1), a second voltage suppressor (TVS 2), a third voltage suppressor (TVS 3), a first inductor and a second inductor, a first power supply input end (V1) of the switching power supply chip (U1) is connected with one end of the first capacitor (C1), a cathode of the second voltage suppressor (TVS 2) and one end of the tenth resistor (R10), a power-off lamp power supply network end (V0) is connected with the other end of the tenth resistor (R10) through a twentieth diode D20, and an anode voltage suppressor (TVS 3) of the second voltage suppressor (TVS 2) is connected with a cathode of the TVS 3), an external inductor terminal (SW) of a switch power supply chip (U1) is connected with one end of a first inductor, the other end of the first inductor is connected with a cathode of a first voltage suppressor (TVS 1), one end of a second capacitor (C2), a second power supply input terminal of a switch power supply chip (U1), a synthesized power supply network terminal (VDD 2) for turning on and turning off the light and electricity, a cathode of a ninth diode (D9) and one end of a ninth resistor (R9) are connected, an anode of the ninth diode (D9), the other end of the ninth resistor (R9) are connected with a cathode of D8 and one end of a twelfth capacitor (C12), an anode of D8 and one end of an eleventh capacitor (C11) are connected with a second power supply input terminal (VI 2) of a power supply conversion circuit (3), a first power supply terminal (VCC) of a drive chip (U2) in a drive unit (1) and a power supply network terminal (V1) for turning on the light are connected, the anode of the first voltage suppressor (TVS 1), the anode of the third voltage suppressor (TVS 3), the other end of the first capacitor (C1), the other end of the second capacitor (C2), the ground terminal of the switching power supply chip (U1), the other end of the eleventh capacitor (C11) and the other end of the twelfth capacitor (C12) are connected with the system power supply ground terminal (GND); a main power output end VOUT1 of the switching power supply chip (U1) is connected with a main power output end (VOUT 1) of the power supply conversion circuit (3); and the system power supply ground terminal (GND) is connected with the control unit (4) ground terminal (VSS) through a second inductor.
7. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: the switch tube unit (2) is composed of a first MOS tube (Q1), a second MOS tube (Q2), a first resistor (R1) and a second resistor (R2), the drain electrode (D) of the first MOS tube (Q1) is connected with the drain electrode (MOS _ D) of the field-effect tube of the control unit (4), the grid electrode (G) of the first MOS tube (Q1) and the grid electrode (G) of the second MOS tube (Q2) are respectively connected with the control grid electrode (MOS _ G) of the field-effect tube of the drive unit (1) through the first resistor (R1) and the second resistor (R2), the source electrodes (S) of the first MOS tube (Q1) and the second MOS tube (Q2) are connected with a system power grounding terminal (GND), and the live wire drain electrode (D) of the first MOS tube (Q1) is connected with a single-switch live wire connecting terminal (L).
8. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: the further technical scheme is as follows: an EMI filter circuit is added and used for filtering out harmonic waves generated by a single live wire switch, avoiding disturbance on an alternating current power grid and meeting the EMI conduction certification requirement in the aspect of electromagnetic compatibility, the EMI filter circuit is composed of an inductor and a capacitor, the inductor is connected in series between a live wire connecting terminal (L) of the single live wire switch and a switch tube unit (2), and two ends of the capacitor are connected to the live wire connecting terminal (L) of the single live wire switch and the other end of the switch tube unit (2) respectively.
9. A single fire wire switching circuit according to any one of claims 2 to 3 wherein: the battery management circuit (8) comprises a front-stage DC/DC circuit (81), a charging circuit (82), an energy storage element (BAT 1), a charging control circuit (83) and a rear-stage DC/DC circuit (84), wherein the energy storage element (BAT 1) comprises a rechargeable battery or a super capacitor; the front-stage DC/DC circuit (81) is mainly used for converting the voltage of a power supply network terminal (VDD 2) formed by combining power supply of a power supply conversion circuit (3) with power supply of a lamp-on state and power supply of a lamp-off state into voltage matched with the voltage of an energy storage element (BAT 1), and the front-stage DC/DC circuit (81) comprises a power supply chip and peripheral elements; the power supply chip type in the preceding-stage DC/DC circuit (81): ME 6221; the charging control circuit (83) is mainly used for controlling the magnitude of charging current and comprises an adjusting tube circuit consisting of a transistor or a field effect tube; the charging circuit (82) mainly realizes the charging of an energy storage element (BAT 1), and the charging circuit (82) comprises a battery charger chip or a charging circuit (82) formed by discrete devices; the rear-stage DC/DC circuit (84) is mainly used for converting the voltage of an energy storage element (BAT 1) into the voltage matched with the control unit (4), the rear-stage DC/DC circuit (84) comprises a power chip and peripheral elements, and the power chip comprises a DC/DC converter chip or a CMOS low dropout linear regulator chip LDO or a combination of the power chip and the CMOS low dropout linear regulator chip LDO; the model of the power chip in the post-stage DC/DC circuit (84): ME6215, or S-8521, or TPS62120, or HT 7533; a lamp-on electricity-taking and lamp-off electricity-taking synthetic power supply network terminal (VDD 2) of the power supply conversion circuit (3) is connected with a power supply terminal (VI) of the charging circuit (82) through the preceding-stage DC/DC circuit (81); the input end of the charging control circuit (83) is connected with a live wire connecting terminal (L) of a single live wire switch and a cathode of a diode between the driving unit (1) and a power supply network terminal (V1) for turning on the lamp, the output end of the charging control circuit (83) is connected with a current adjusting terminal (PROG) of the charging circuit (82), and the charging control circuit (83) automatically adjusts the charging current of the charging circuit (82) according to the voltage of the power supply network terminal (V1) for turning on the lamp; an output terminal of the charging circuit (82) is connected to the energy storage element (BAT 1) and charges the same to store energy; the energy storage element (BAT 1) passes through the rear-stage DC/DC circuit (84) and then is output and supplied to the control unit (4); the enabling end (CE) of the power chip (U3) in the front-stage DC/DC circuit (81) and the enabling end (CE) of the power chip (U4) in the rear-stage DC/DC circuit (84) are directly or indirectly connected with the main power output end (VOUT 1) of the power conversion circuit (3), so that the NB-IoT or LoRa communication module in the control unit (4) is output and supplied with power only under the condition that the single-live-wire switch is electrified.
10. A single fire wire switching circuit as claimed in any one of claims 1 to 3 wherein: furthermore, the number of load circuits of the single live wire switch is increased without correspondingly increasing a load detection circuit (6) and a zero-crossing detection circuit (7), so that the circuit cost of the single live wire switch is effectively reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211467.1U CN211909255U (en) | 2019-12-11 | 2019-12-11 | Single live wire switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211467.1U CN211909255U (en) | 2019-12-11 | 2019-12-11 | Single live wire switch circuit |
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| CN211909255U true CN211909255U (en) | 2020-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596426A (en) * | 2020-11-30 | 2021-04-02 | 深圳市欧瑞博科技股份有限公司 | Control and networking method and device of single-live-wire Bluetooth intelligent switch and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596426A (en) * | 2020-11-30 | 2021-04-02 | 深圳市欧瑞博科技股份有限公司 | Control and networking method and device of single-live-wire Bluetooth intelligent switch and electronic equipment |
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