CN210201485U - Single-live-wire power taking circuit, control circuit and power supply system - Google Patents
Single-live-wire power taking circuit, control circuit and power supply system Download PDFInfo
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- CN210201485U CN210201485U CN201921239540.XU CN201921239540U CN210201485U CN 210201485 U CN210201485 U CN 210201485U CN 201921239540 U CN201921239540 U CN 201921239540U CN 210201485 U CN210201485 U CN 210201485U
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Abstract
The utility model discloses a single fire gets electric circuit, it includes the constant current circuit that first constant current circuit and second constant current circuit are constituteed, the input of first constant current circuit is connected to the output of AC-DC circuit, the output of first constant current circuit is connected to energy memory, the second constant current circuit has two at least constant current sub-circuits, single fire gets electric circuit still includes selection circuit and switch circuit, two at least constant current sub-circuit's input all is connected to the output of AC-DC circuit, two at least constant current sub-circuit's output all is connected to selection circuit's input, selection circuit is used for selecting wherein constant current sub-circuit's output current all the way to energy memory through switch circuit output. The utility model also discloses a single fire gets electric control circuit and power supply system. The utility model discloses can guarantee wireless communication module's normal use under the condition that does not have the influence to the load.
Description
Technical Field
The utility model relates to a single fire gets technical field, especially relates to a single fire gets electric circuit, control circuit and power supply system.
Background
Along with the popularization and development of the intelligent home technology, more and more intelligent electric equipment based on wireless control is applied to household life and commercial lighting. The intelligent electric equipment can be in wireless communication with the wireless communication module in the wall switch used in cooperation, and further can receive regulation and control of a wireless control instruction sent by the controller. Because the wiring of traditional wall switch generally is the power supply of single live wire, get the power supply circuit for wireless communication module power supply through increasing single live wire, this kind of condition is limited to wireless communication module power supply ability, consequently need add the energy storage device parallelly connected with wireless communication module, super capacitor for example, under the existing load condition of work on single live wire, when being wireless communication module power supply through single live wire supply circuit, also charge for the energy storage device, under the out-of-operation (load outage) condition of load existing on single live wire, the energy storage device supplies power for wireless communication module, there is following problem in this kind of condition:
the current of wireless communication module during operation can cause certain influence to the load on the single live wire, for example: leading to burning of the load and the appearance of a ghost fire in the lighting;
under the condition that the load is powered off for a long time, the energy storage device cannot continuously supply power to the wireless communication module along with the standby or/and use of the wireless communication module.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a single fire electricity-taking circuit, which can guarantee the normal use of a wireless communication module under the condition of no influence on the load.
The utility model discloses an one of the purpose adopts following technical scheme to realize:
the single live wire electricity taking circuit comprises an AC-DC circuit and a constant current circuit, wherein the input end of the AC-DC circuit is connected to a single live wire, and the output end of the AC-DC circuit outputs a target current through the constant current circuit to charge an external energy storage device; the single fire electricity taking circuit comprises an AC-DC circuit, an energy storage device, a constant current circuit, a single fire electricity taking circuit, a selection circuit and a switch circuit, wherein the constant current circuit comprises a first constant current circuit and a second constant current circuit, the input end of the first constant current circuit is connected to the output end of the AC-DC circuit, the output end of the first constant current circuit is connected to the energy storage device, the second constant current circuit is provided with at least two constant current sub-circuits, the single fire electricity taking circuit further comprises the selection circuit and the switch circuit, the input ends of the at least two constant current sub-circuits are connected to the output end of the AC-DC circuit, the output ends of the at least two constant current sub-circuits are connected to the input end of the selection.
Further, the second constant current circuit comprises a first constant current sub-circuit and a second constant current sub-circuit; the first constant current sub-circuit comprises a first resistor, one end of the first resistor is connected to the AC-DC circuit, and the other end of the first resistor is connected to the input end of the selection circuit; the second constant current sub-circuit comprises a second resistor, one end of the second resistor is connected to the AC-DC circuit, and the other end of the second resistor is connected to the input end of the selection circuit.
Further, the selection circuit comprises an analog switch, the analog switch is provided with two input ends, the two input ends of the analog switch are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and the output end of the analog switch is connected to the input end of the switch circuit.
Furthermore, the analog switch is a single-pole double-throw switch, two static contacts of the single-pole double-throw switch are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and a movable contact of the single-pole double-throw switch is connected to the input end of the switch circuit;
or;
the analog switch is a chip BL1551, two input ends of the chip BL1551 are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and the output end of the chip BL1551 is connected to the input end of the switch circuit; the enable end of the chip BL1551 is connected to an external enable signal.
Furthermore, the switch circuit comprises an electronic switch, a third resistor and a first PNP triode, a power supply end of the electronic switch is connected to a direct current source or an external auxiliary power supply, an output end of the electronic switch is connected to a base electrode of the first PNP triode, and an enable end of the electronic switch is connected to an external control signal through the third resistor; and the emitter of the first PNP triode is connected to the output end of the selection circuit, and the collector of the first PNP triode is connected to the energy storage device.
Further, the electronic switch is a chip MAX 40200.
Further, the switch circuit further comprises a second PNP triode, an emitter of the second PNP triode is connected to the direct current source, a base of the second PNP triode is connected to an emitter of the first PNP triode, and a collector of the second PNP triode is connected to the power supply end of the chip MAX 40200.
Further, the first constant current circuit comprises a fourth resistor, a third PNP triode, a fourth PNP triode and a fifth resistor, an emitter of the third PNP triode is connected to the AC-DC circuit through the fourth resistor, a collector of the third PNP triode is connected to the energy storage device, an emitter of the fourth PNP triode is connected to the AC-DC circuit, a collector of the fourth PNP triode is grounded through the fifth resistor, a base of the fourth PNP triode is connected between the fourth resistor and the emitter of the third PNP triode, and a base of the third PNP triode is connected between the fifth resistor and the collector of the fourth PNP triode.
A second object of the utility model is to provide a single fire gets electric control circuit, it can guarantee wireless communication module's normal use under the condition that does not have the influence to the load.
A single live wire power-taking control circuit comprises a controller and the single live wire power-taking circuit, wherein the controller is provided with a first input end, a second input end, a first control end and a second control end, and the first input end is used for receiving real-time current on a single live wire; the second input end is used for receiving voltage information of the energy storage device; the first control end controls the switch circuit according to the real-time current or/and voltage information; and the second control end controls the constant current sub-circuit selected by the selection circuit according to the voltage information.
The third object of the present invention is to provide a power supply system, which can ensure the normal use of the wireless communication module without affecting the load.
A power supply system, it includes power consumption module, energy storage device and the utility model discloses the second purpose single fire get electric circuit, the energy storage device is the consumer power supply.
Further, the wireless communication module is any one of a WIFI chip, a Bluetooth chip, an infrared chip, a ZigBee chip, a 3G module, a 4G module, a 5G module and a GPS module.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses get the electricity on single live wire, charge for the energy storage device through the cooperation of first constant current circuit and multichannel constant current sub-circuit to the realization can guarantee wireless communication module's normal use under the condition of no influence to the load.
Drawings
FIG. 1 is a schematic block diagram of a single live wire power supply circuit according to an embodiment of the present invention
Fig. 2 is a schematic block diagram of a second constant current sub-circuit and a constant current control circuit according to the first embodiment of the present invention;
fig. 3 is a schematic block diagram of an AC-DC circuit according to a first embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an AC-DC circuit according to a first embodiment of the present invention (without a regulated output circuit);
fig. 5 is a schematic circuit diagram of a regulated output circuit according to a first embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a first constant current sub-circuit and a second constant current sub-circuit according to a first embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a selection circuit according to a first embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a switching circuit according to a first embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a first constant current circuit according to a first embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a comparator circuit according to a second embodiment of the present invention.
Wherein: 10. an AC-DC circuit; 11. a rectifying circuit; 12. a transformer; 13. a follow current rectification circuit; 14. a feedback circuit; 15. a switch controller; 16. a voltage stabilization output circuit; 20. a second constant current circuit; 21. a first constant current sub-circuit; 22. a second constant current sub-circuit; 30. a constant current control circuit; 31. a selection circuit; 32. a switching circuit; 40. a first constant current circuit; 50. an energy storage device; 51. a comparator circuit; 60. a controller; 70. an electricity-consuming device; 80. an alternating current source; 81. a single live wire; 90. a load; 91. a zero-crossing detection circuit; 92. and a silicon controlled control circuit.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying drawings, and it is to be understood that the following description of the present invention is made only by way of illustration and not by way of limitation with reference to the accompanying drawings. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
Example one
Referring to fig. 1, a single live wire electricity-taking circuit includes an AC-DC circuit 10 and a constant current circuit, where the AC-DC circuit is connected in an AC loop, the AC loop mainly includes an AC source 80 and a load 90, the AC source 80 and the load 90 are connected through a single live wire 81 to form a loop, an input end of the AC-DC circuit is connected to the single live wire to achieve single live wire electricity-taking, an output end of the AC-DC circuit outputs a target current through the constant current circuit to charge an external energy storage device 50, and the energy storage device supplies power to an electric device, and the constant current circuit does not directly supply power to the electric device 70.
The utility model discloses in the preferred embodiment, constant current circuit includes first constant current circuit and second constant current circuit, wherein, first constant current circuit lug connection is on the energy storage device, for the energy storage device power supply, first constant current circuit is the normal open constant current circuit, no matter whether the load works and the energy storage device reaches fully, it is the energy storage device power supply, consequently, in order to prevent to the energy storage device charging process to first constant current circuit, cause the influence to the load when out of work, first constant current circuit's output current is less, for example can be 1mA or less even.
Please refer to fig. 1 and fig. 2, the output current of the second constant current circuit is large, in order to cooperate with the second constant current circuit, the present invention further provides a constant current control circuit 30, wherein the second constant current circuit includes at least two constant current sub-circuits, the constant current control circuit 30 includes a selection circuit 31 and a switch circuit 32, the constant current sub-circuits are connected in parallel, that is, the input ends of the constant current sub-circuits are all connected to the AC-DC circuit, the output ends are all connected to the input end of the selection circuit, the selection circuit is used for selecting one of the output currents of the constant current sub-circuits to be connected to the energy storage device via the switch circuit, so as to charge the energy storage device.
The mode of selecting a certain constant current sub-circuit by the selection circuit can be any one of the following modes: one is carried out according to the length of charging time, namely, a plurality of time nodes are set (timing is carried out from the beginning of charging), and corresponding constant current sub-circuits are selected at the corresponding time nodes; and secondly, selecting a corresponding constant current sub-circuit under corresponding electric quantity according to the electric quantity condition of the energy storage device. Of course, the selection can also be done manually. In the preferred embodiment of the present invention, the corresponding constant current sub-circuit is selected according to the electric quantity of the energy storage device.
The second constant current circuit is started on the premise that the load works, so that the current on the single live wire needs to be detected, and the second constant current circuit is controlled to be started or not through the switch circuit. The switching circuit is mainly used for selecting whether the constant current sub-circuits are charged or not, and generally, the connection between the selection circuit and the energy storage device is disconnected only when the energy storage device is charged or/and the load does not work. Of course, in some special occasions, the electric quantity can be preset for the energy storage device, and when the electric quantity of the energy storage device meets the preset electric quantity, the connection between the selection circuit and the energy storage device is disconnected through the switch circuit.
Referring to fig. 3 and 4, the AC-DC circuit includes a rectifying circuit 11, a transformer 12, and a freewheeling circuit 13, wherein an input terminal of the rectifying circuit is connected to an external AC power source, an output terminal of the rectifying circuit outputs a first target voltage (i.e., an output voltage of the AC-DC circuit, which outputs a target current through a constant current circuit to charge an external energy storage device) via the transformer and the freewheeling circuit, and further includes a switch controller 15 and a feedback circuit 14, wherein the switch controller is a chip LNK362 or LNK363 or LNK 364; the source electrode pin of the switch controller is connected to the output end of the rectifying circuit, the drain electrode pin of the switch controller is connected to the control end of the transformer, the input end of the feedback circuit is connected to the output end of the follow current circuit, and the output end of the feedback circuit is connected to the feedback pin of the switch controller.
The switch controller adopts one of micro-power consumption chips LNK362, LNK363 and LNK364 to adjust the first target voltage, so as to ensure the stability of the output of the first target voltage and realize the limitation of the power consumption of the AC-DC circuit. The LNK362, LNK363, and LNK364 are selected according to the requirements of the first target voltage, for example, if the first target voltage is 5V, the LNK363 chip may be selected.
An external alternating current power supply (such as mains supply) is rectified by a rectifying circuit to form a high-voltage direct current signal, the high-voltage direct current signal is converted by a transformer and then is subjected to voltage reduction, and then the high-voltage direct current signal is rectified by a follow current circuit to form a first target voltage, namely the required voltage for charging electric equipment. The feedback circuit samples the first target voltage, and the first target voltage is adjusted through the switching performance of the switch controller, so that the purpose of voltage stabilization is achieved.
Referring to fig. 4, the rectifying circuit is a full-wave rectifying bridge. The input end of the full-wave rectifier bridge is connected to an external alternating current power supply, namely the commercial power, and a plurality of rectifier circuits can be arranged according to the condition of the commercial power of different countries, and are connected in parallel and connected with the corresponding commercial power. Of course, a plurality of rectifying circuits are connected in parallel, and redundant power supply of a plurality of external alternating-current power supplies can also be realized. An EMC circuit can be arranged between the full-wave rectifier bridge and an external alternating current power supply according to requirements so as to improve the electromagnetic compatibility of the AC-DC circuit.
Still can be first filter circuit between rectifier circuit and the transformer, first filter circuit is low pass filter circuit the utility model discloses in the embodiment of preferred, adopt RC low pass filter. Namely, the first filter circuit comprises a resistor R14 and a capacitor C4, and the positive output end of the full-wave rectifier bridge is connected to the source electrode pin of the switch controller after passing through a resistor R14 and a capacitor C4; the negative output end of the full-wave rectifier bridge is connected to a source electrode pin of the switch controller; the positive output end of the full-wave rectifier bridge is connected to the input end of the transformer through a resistor R14.
The transformer comprises a primary winding, a secondary winding and an auxiliary winding, wherein the dotted terminal of the primary winding is connected to a drain electrode pin of the switch controller; the synonym terminal of the primary winding is connected between a resistor R14 and a capacitor C4; the dotted terminal of the secondary winding outputs a first target voltage through a follow current circuit; and the synonym end of the secondary winding is grounded. The auxiliary winding is matched with an auxiliary circuit and is mainly used for filtering and absorbing leakage inductance, the auxiliary circuit comprises a capacitor CP4, a capacitor C112, a diode D8 and a resistor R26, wherein the dotted terminal of the auxiliary winding is connected to the negative output end of the full-wave rectifier bridge, the unlike terminal of the auxiliary winding is connected to a bypass pin of the switch controller through the diode D8 and the resistor R26, one end of the capacitor CP4 and the capacitor C112 after being connected in parallel is connected between the diode D8 and the resistor R26, and the other end of the capacitor CP4 and the capacitor C112 after being connected in parallel is connected to the negative output end of the full-wave.
The free-wheeling circuit mainly comprises a diode D4 and a capacitor CP1, wherein the anode of the diode D4 is connected to the dotted terminal of the secondary winding, the anode of the capacitor CP1 is connected to the cathode of the diode D4, and the cathode of the capacitor CP1 and the dotted terminal of the secondary winding are both grounded.
A second filter circuit and an anti-reverse diode D5 are further arranged at the output end of the freewheeling circuit, wherein the anode of the anti-reverse diode D5 is connected between the cathode of the diode D4 and the anode of the capacitor CP1, and the cathode of the anti-reverse diode D5 outputs a first target voltage through the second filter circuit; in the preferred embodiment of the present invention, three filter capacitors are adopted, namely, capacitor CP2, capacitor C2 and capacitor C3, wherein one end of capacitor CP2, capacitor C2 and capacitor C3 is connected to the negative electrode of anti-reverse diode D5, and the other end is grounded.
The feedback circuit comprises a voltage division circuit, an optocoupler and a voltage stabilizing circuit, wherein the voltage division circuit comprises a resistor R37 and a resistor R38; the voltage stabilizing circuit comprises a resistor R39, a capacitor C6, a voltage stabilizing tube U8 and a resistor R40, wherein one end of the resistor R37 is connected to the output end of the follow current circuit (the cathode of a diode D4); the other end of the resistor R37 is connected to the cathode of a voltage regulator tube U8 through a resistor R38; the input end of the optical coupler is connected between the resistor R37 and the resistor R38, and the output end of the optical coupler is connected to a feedback pin of the switch controller. The cathode of the voltage regulator tube U8 is also connected to the output end of the follow current circuit through a capacitor C6 and a resistor R39; the reference end of the voltage regulator tube U8 is connected between the resistor R39 and the capacitor C6, one end of the resistor R40 is grounded, and the other end of the resistor R40 is connected between the resistor R39 and the capacitor C6.
The switch controller internally comprises a 700V MOSFET and a controller thereof (called as a MOSFET controller), and a high-voltage current source internally connected to a drain electrode of the switch controller provides bias current in a starting stage, so that an external starting circuit is omitted. An oscillator integrated within the switch controller can provide 132KHz output pulses to the output MOSFET.
The switch controller also integrates some functions for system level protection. The auto-restart function may limit power dissipation in the MOSFETs, transformers, and output diodes (diode D8) under overload, output short circuit, or open loop conditions. The auto-recovery hysteresis thermal shutdown function may also disable the MOSFET switch when the temperature exceeds a safety limit.
The working principle is as follows: the switch controller converts the high-voltage direct current signal output by the first rectifier diode (via the first filter circuit) into a pulse signal of 132KHz by controlling the internal MOSFETs to be continuously switched on and off. When the MOSFET is turned on, the current flowing in the primary winding of the transformer increases to reach the peak value Ip. When the MOSFET is turned on and off, the flyback voltage causes the output diode to enter a conducting state, energy stored in the auxiliary winding is transferred to the secondary, providing load current, and charging the freewheeling capacitor (CP 4). The duty ratio of the pulse signal output by the switch controller can be adjusted through the feedback circuit, so that the size of the peak current Ip is adjusted, and the voltage-stabilizing output effect is achieved.
In order to meet the voltage requirements of other devices, in a preferred embodiment of the present invention, a voltage stabilizing output circuit 16 is further provided for converting the first target voltage into a second target voltage (for supplying power to other devices, such as a controller, etc.), for example, the first target voltage is 5V, and the second target voltage is 3.3V. Referring to fig. 5, the voltage stabilizing output circuit includes a voltage stabilizer, an input filter circuit and an output filter circuit, an input end of the voltage stabilizer is connected to an output end of the follow current circuit, an output end of the voltage stabilizer outputs a second target voltage, the input filter circuit is connected between the output end of the follow current circuit and the input end of the voltage stabilizer, and the output filter circuit is connected to the output end of the voltage stabilizer.
The voltage stabilizer can adopt HT7550 and the like, and the input filter circuit and the output filter circuit can be one or more filter capacitors. When a plurality of filter capacitors are adopted, the filter capacitors are connected in parallel and then connected to corresponding positions.
In the preferred embodiment of the present invention, the second constant current circuit 20 is exemplified by two paths of constant current sub-circuits, namely, a first constant current sub-circuit 21 and a second constant current sub-circuit 22. The constant current sub-circuit in other cases is basically the same as the realization process.
Referring to fig. 6, the first constant current sub-circuit 21 includes a first resistor (resistor R112), one end of the first resistor is connected to the AC-DC circuit, and the other end of the first resistor is connected to the input end of the selection circuit; the second constant current sub-circuit comprises a second resistor (resistor R215), one end of the second resistor is connected to the AC-DC circuit, and the other end of the second resistor is connected to the input end of the selection circuit.
The output currents of the first constant current sub-circuit and the second constant current sub-circuit are related to the resistance values of the first resistor and the second resistor, different resistance values can be set according to different requirements, the output currents of the first constant current sub-circuit and the second constant current sub-circuit can be equal, but the situation has no practical significance. Therefore, in a preferred embodiment of the present invention, the resistances of the first resistor and the second resistor are different, for example, the output current of the first constant current sub-circuit is 6mA, and the output current of the second constant current sub-circuit is 30 mA.
The selection circuit mainly comprises an analog switch, the analog switch is provided with two input ends, the two input ends of the analog switch are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and the output end of the analog switch is connected to the input end of the switch circuit.
The analog switch can adopt a single-pole double-throw switch, two static contacts of the single-pole double-throw switch are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, a movable contact of the single-pole double-throw switch is connected to the input end of the switch circuit, and the output selection of the manual control constant current circuit can be realized by adopting the single-pole double-throw switch.
In a preferred embodiment of the present invention, please refer to fig. 7, the analog switch is a chip BL1551 (chip U22), two input terminals of the chip BL1551 are respectively connected to an output terminal of the first constant current sub-circuit and an output terminal of the second constant current sub-circuit, and an output terminal of the chip BL1551 is connected to an input terminal of the switching circuit; the enable end of the chip BL1551 is connected to an external enable signal.
The external enable signal can be realized by a microprocessor, such as a single chip microcomputer, and the like, that is, a corresponding time threshold (when the constant current sub-circuit is selected by charging time) or a corresponding electric quantity threshold (when the constant current sub-circuit is selected by charging electric quantity of the energy storage device) is stored in the microprocessor. When the selection is realized by the charging time, the clock of the microprocessor times when the charging is started, and when the timing time reaches the corresponding time threshold, the corresponding constant current sub-circuit is selected; when the selection is realized by the charging electric quantity, the microprocessor collects the electric quantity condition of the energy storage device, and when the electric quantity condition reaches the corresponding electric quantity threshold value, the corresponding constant current sub-circuit is selected.
The microprocessor only compares the collected information with a stored threshold value, so as to output a corresponding level signal (high level or low level) as an enable signal to control an enable end of the chip BL1551, and the improvement of software is not involved. The output end of the chip BL1551 is the input current of a certain input end of the chip BL1551, and the chip BL1551 can also be called a single-pole double-throw switch capable of realizing automatic control.
Referring to fig. 6 and 8, the switch circuit mainly includes an electronic switch, a third resistor (resistor R90) and a first PNP transistor (transistor Q10). The electronic switch adopts a chip MAX40200 (a chip U18, and certainly, other forms of electronic switches such as a triode, an MOS transistor and the like can be adopted), a power supply end of the chip MAX40200 is connected to a direct current source or an external auxiliary power supply, an output end of the chip MAX40200 is connected to a base electrode of a first PNP triode, and an enabling end of the chip MAX40200 is connected to an external control signal through a third resistor (the enabling end can also be generated by a microprocessor which compares the collected electric quantity of the energy storage device with a preset electric quantity threshold value for controlling the chip MAX40200 to generate a control signal); and the emitter of the first PNP triode is connected to the output end of the selection circuit, and the collector of the first PNP triode is connected to the energy storage device.
When the control signal is at a high level, the first PNP triode is conducted, the current output by the selection circuit flows to the collector electrode through the emitter electrode of the first PNP triode and then charges the energy storage device, and when the control signal is at a low level, the first PNP triode is cut off, and the constant current sub-circuit cannot charge the energy storage device.
In the preferred embodiment of the present invention, the switch circuit further includes a second PNP triode (triode Q11), an emitter of the second PNP triode is connected to the AC-DC circuit, a base of the second PNP triode is connected to an emitter of the first PNP triode, and a collector of the second PNP triode is connected to the power source terminal of the chip MAX 40200.
In the preferred embodiment of the present invention, the power supply further comprises a first constant current circuit 40, an input end of the first constant current circuit is connected to the AC-DC circuit, and an output end of the first constant current circuit is connected to the energy storage device. The first constant current circuit preferably outputs a smaller current than the above-described constant current sub-circuit, which always charges the energy storage device as long as the AC-DC circuit is present.
Referring to fig. 9, the first constant current circuit includes a fourth resistor (resistor R109), a third PNP transistor (transistor Q7), a fourth PNP transistor (transistor Q8), and a fifth resistor (resistor R11), an emitter of the third PNP transistor is connected to the AC-DC circuit through the fourth resistor, a collector of the third PNP transistor is connected to the energy storage device, an emitter of the fourth PNP transistor is connected to the AC-DC circuit, a collector of the fourth PNP transistor is grounded through the fifth resistor, a base of the fourth PNP transistor is connected between the fourth resistor and the emitter of the third PNP transistor, and a base of the third PNP transistor is connected between the fifth resistor and the collector of the fourth PNP transistor.
The multi-path constant current sub-circuit is connected to the AC-DC circuit in a parallel connection mode, and then the multi-path constant current sub-circuit is controlled by the selection circuit and the switch circuit, so that different charging currents are adopted for different stages of charging of the energy storage device, the structure is simple, the cost is low, and meanwhile, the power consumption of the charging circuit is reduced.
Example two
The second embodiment discloses a single live wire power-taking control circuit, which mainly controls the single live wire power-taking circuit of the first embodiment, and the single live wire power-taking control circuit comprises a single live wire power-taking circuit and a controller 60.
The controller is provided with a controller, a first input end, a second input end, a first control end and a second control end, wherein the first input end is used for receiving real-time current on a single live wire; the second input end is used for receiving voltage information of the energy storage device; the first control end controls the switch circuit according to the real-time current or/and voltage information; and the second control end controls the constant current sub-circuit selected by the selection circuit according to the voltage information.
The principle is as follows:
when the real-time current is less than or equal to a first threshold value; or/and when the voltage information is greater than or equal to a second threshold value, the connection between the selection circuit and the energy storage device is disconnected through the first control end control switch circuit, and at the moment, only the first constant current circuit charges the energy storage device;
when the real-time current is greater than or equal to a third threshold and the voltage information is less than a second threshold, the first control end controls the switch circuit to conduct the connection between the selection circuit and the energy storage device, and the second control end controls the selection circuit to select one constant current sub-circuit to charge the energy storage device through the switch circuit; at the moment, the first constant current circuit and the second constant current circuit charge the energy storage device at the same time.
When the second constant current circuit comprises the first constant current sub-circuit and the second constant current sub-circuit, when the real-time current is greater than or equal to a third threshold value and the voltage information is less than a second threshold value, the method further comprises the following steps:
when the voltage information is less than or equal to a fourth threshold value, the second control end controls the selection circuit to select the first constant current sub-circuit to charge the energy storage device through the switch circuit;
when the voltage information is larger than a fourth threshold and smaller than a second threshold, the second control end controls the selection circuit to select the second constant current sub-circuit to charge the energy storage device through the switch circuit;
the output current of the first constant current sub-circuit is larger than that of the second constant current sub-circuit; the first threshold value is larger than or equal to the output current of the first constant current circuit, and the output current of the second constant current sub-circuit is larger than the first threshold value.
The first threshold to the fourth threshold are all set as required, for example, the first threshold is set as required for a load, for example, when the load is an LED lamp, the first threshold may be set to 1.2mA, the second threshold may be set to 4V according to the maximum electric quantity of the super capacitor, the third threshold may be set to 50mA or the like according to the normal operation condition of the load, and preferably, the third threshold is greater than the output current of the first constant current sub-circuit, so that when the load operates, the output of any one constant current sub-circuit does not affect the load. The fourth threshold may be 3V, etc.
In order to collect the voltage information of the energy storage device, a sampling circuit is arranged at the second input ends of the energy storage device and the controller, and the sampling circuit can be a divider resistance sampling circuit or a comparator circuit 51.
Referring to fig. 10, the comparator circuit mainly includes a first comparator circuit and a second comparator circuit, and the second input terminal includes a second first input terminal and a second input terminal, wherein:
the first comparator circuit comprises a resistor R103, a resistor R104, a comparator U20A and a resistor R204, wherein one end of the resistor R103 and the resistor R104 which are connected in series is grounded, and the other end of the resistor R is connected to the output end of the energy storage device; the positive input terminal of the comparator U20A is connected to the external reference voltage source 52, the negative input terminal of the comparator U20A is connected between the resistor R103 and the resistor R104, and the output terminal of the comparator U20A is connected to the second input terminal of the controller via the resistor R204.
The second comparator circuit comprises a resistor R105, a resistor R106, a comparator U20B and a resistor R205, wherein one end of the resistor R105 and the resistor R106 which are connected in series is grounded, and the other end of the resistor R105 and the resistor R106 which are connected in series is connected to the output end of the energy storage device; the positive input terminal of the comparator U20B is connected to the external reference voltage source 52, the negative input terminal of the comparator U20B is connected between the resistor R105 and the resistor R106, and the output terminal of the comparator U20B is connected to the second input terminal of the controller via the resistor R205.
It should be noted that: the two circuits are used for comparing with the second threshold and the fourth threshold, respectively, for example, the signal received by the second first input terminal is used for comparing with the second threshold, and the signal received by the second input terminal is used for comparing with the fourth threshold, and of course, the voltage information of the energy storage device may also be directly sampled and compared with the second threshold and the fourth threshold stored in the controller.
Meanwhile, the reference voltage sources externally connected to the first comparator and the second comparator may be reference voltage sources with different voltages, or the same reference voltage source as described in fig. 10 may be used, and when the same reference voltage source is used, the corresponding voltage dividing resistors (the resistor R105 and the resistor R106, and the resistor R103 and the resistor R104) need to be set.
The first input end receives real-time current of a single live wire, and a current sampling circuit can be added to the single live wire, for example, the current sampling circuit is implemented by a current transformer, and of course, other modes are also possible.
The utility model discloses in the embodiment of preferred, when the load is LED lamps and lanterns, still include controller, zero cross detection circuit 91 and silicon controlled rectifier control circuit 92, this controller, zero cross detection circuit 91 and silicon controlled rectifier control circuit 92 are the conventional circuit of current LED lamps and lanterns, through zero cross detection of zero cross detection circuit to and the control instruction of the user that the controller received, realize the dimming operation to LED lamps and lanterns via silicon controlled rectifier control circuit (the angle of conduction of control silicon controlled rectifier). Namely, the controller of the utility model can borrow the controller of the LED lamp, thereby saving the cost.
EXAMPLE III
The third embodiment discloses a power supply system, which adopts the single live wire power-taking circuit, the controller, the energy storage device and the wireless communication module, wherein the single live wire power-taking circuit charges the energy storage device, and the energy storage device supplies power to the wireless communication module.
The wireless communication module can be any one of a WIFI chip, a Bluetooth chip, an infrared chip, a ZigBee chip, a 3G module, a 4G module, a 5G module and a GPS module.
The single live wire power-taking circuit and the energy storage device are used in the wireless communication module of the intelligent home system, so that normal use of the wireless communication module can be guaranteed under the condition of no influence on loads.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.
Claims (10)
1. The single live wire electricity taking circuit comprises an AC-DC circuit and a constant current circuit, wherein the input end of the AC-DC circuit is connected to a single live wire, and the output end of the AC-DC circuit outputs a target current through the constant current circuit to charge an external energy storage device; the single fire electricity taking circuit is characterized in that the constant current circuit comprises a first constant current circuit and a second constant current circuit, the input end of the first constant current circuit is connected to the output end of the AC-DC circuit, the output end of the first constant current circuit is connected to the energy storage device, the second constant current circuit is provided with at least two constant current sub-circuits, the single fire electricity taking circuit further comprises a selection circuit and a switch circuit, the input ends of the at least two constant current sub-circuits are connected to the output end of the AC-DC circuit, the output ends of the at least two constant current sub-circuits are connected to the input end of the selection circuit, and the selection circuit is used for selecting one constant current sub-circuit to enable the output current of the selected constant current sub-circuit to be output to.
2. The single live wire power taking circuit according to claim 1, wherein the second constant current circuit includes a first constant current sub-circuit and a second constant current sub-circuit; the first constant current sub-circuit comprises a first resistor, one end of the first resistor is connected to the AC-DC circuit, and the other end of the first resistor is connected to the input end of the selection circuit; the second constant current sub-circuit comprises a second resistor, one end of the second resistor is connected to the AC-DC circuit, and the other end of the second resistor is connected to the input end of the selection circuit.
3. The single live wire power taking circuit according to claim 2, wherein the selection circuit comprises an analog switch having two input terminals, the two input terminals of the analog switch are respectively connected to the output terminal of the first constant current sub-circuit and the output terminal of the second constant current sub-circuit, and the output terminal of the analog switch is connected to the input terminal of the switching circuit.
4. The single live wire power-taking circuit as claimed in claim 3, wherein the analog switch is a single-pole double-throw switch, two fixed contacts of the single-pole double-throw switch are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and a moving contact of the single-pole double-throw switch is connected to the input end of the switch circuit;
or;
the analog switch is a chip BL1551, two input ends of the chip BL1551 are respectively connected to the output end of the first constant current sub-circuit and the output end of the second constant current sub-circuit, and the output end of the chip BL1551 is connected to the input end of the switch circuit; the enable end of the chip BL1551 is connected to an external enable signal.
5. A single live wire power-taking circuit as claimed in any one of claims 1 to 4, wherein the switch circuit comprises an electronic switch and a third resistor and a first PNP triode, a power supply end of the electronic switch is connected to a direct current source or an external auxiliary power supply, an output end of the electronic switch is connected to a base electrode of the first PNP triode, and an enabling end of the electronic switch is connected to an external control signal through the third resistor; and the emitter of the first PNP triode is connected to the output end of the selection circuit, and the collector of the first PNP triode is connected to the energy storage device.
6. The single live wire power taking circuit according to claim 5, wherein the electronic switch is a chip MAX 40200.
7. The single live wire power taking circuit according to claim 6, wherein the switching circuit further comprises a second PNP triode, an emitter of the second PNP triode is connected to the direct current source, a base of the second PNP triode is connected to an emitter of the first PNP triode, and a collector of the second PNP triode is connected to a power supply end of the chip MAX 40200.
8. A single fire electricity taking circuit as claimed in any one of claims 1 to 4, wherein the first constant current circuit comprises a fourth resistor, a third PNP triode, a fourth PNP triode and a fifth resistor, wherein an emitter of the third PNP triode is connected to the AC-DC circuit through the fourth resistor, a collector of the third PNP triode is connected to the energy storage device, an emitter of the fourth PNP triode is connected to the AC-DC circuit, a collector of the fourth PNP triode is grounded through the fifth resistor, a base of the fourth PNP triode is connected between the fourth resistor and the emitter of the third PNP triode, and a base of the third PNP triode is connected between the fifth resistor and the collector of the fourth PNP triode.
9. A single live wire electricity taking control circuit is characterized by comprising a controller and the single live wire electricity taking circuit as claimed in any one of claims 1 to 8, wherein the controller is provided with a first input end, a second input end, a first control end and a second control end, and the first input end is used for receiving real-time current on a single live wire; the second input end is used for receiving voltage information of the energy storage device; the first control end controls the switch circuit according to the real-time current or/and voltage information; and the second control end controls the constant current sub-circuit selected by the selection circuit according to the voltage information.
10. A power supply system, comprising a wireless communication module, an energy storage device and the single live wire power supply control circuit of claim 9, wherein the energy storage device supplies power to a power consumer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921239540.XU CN210201485U (en) | 2019-08-01 | 2019-08-01 | Single-live-wire power taking circuit, control circuit and power supply system |
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| CN201921239540.XU CN210201485U (en) | 2019-08-01 | 2019-08-01 | Single-live-wire power taking circuit, control circuit and power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323747A (en) * | 2019-08-01 | 2019-10-11 | 杭州博联智能科技股份有限公司 | Single fire power-supply circuit, power supply system, control circuit and control method |
| CN112859668A (en) * | 2020-12-31 | 2021-05-28 | 深圳市云鼠科技开发有限公司 | Voltage and current switching circuit |
-
2019
- 2019-08-01 CN CN201921239540.XU patent/CN210201485U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323747A (en) * | 2019-08-01 | 2019-10-11 | 杭州博联智能科技股份有限公司 | Single fire power-supply circuit, power supply system, control circuit and control method |
| CN112859668A (en) * | 2020-12-31 | 2021-05-28 | 深圳市云鼠科技开发有限公司 | Voltage and current switching circuit |
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