CN107148132B - Single live wire on-state power taking circuit - Google Patents
Single live wire on-state power taking circuit Download PDFInfo
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- CN107148132B CN107148132B CN201710399378.7A CN201710399378A CN107148132B CN 107148132 B CN107148132 B CN 107148132B CN 201710399378 A CN201710399378 A CN 201710399378A CN 107148132 B CN107148132 B CN 107148132B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model provides a single-live-wire on-state power taking circuit, and belongs to the technical field of electronics. The circuit solves the problem of low reliability of the prior art. The single live wire on-state electricity taking circuit comprises a comparison chip, and an electricity taking module, a voltage stabilizing module, a signal output module, a switch module, an electricity taking detection module and an electricity taking reference voltage module which are connected with the comparison chip respectively, wherein the switch module is also connected with the electricity taking module, the voltage stabilizing module is also connected with the electricity taking reference voltage module, the electricity taking module is also connected with the input end of the voltage stabilizing module and the electricity taking detection module respectively, the electricity taking module comprises an electrolytic capacitor C1, the electricity taking detection module comprises a voltage stabilizing diode ZD1, the electricity taking module is connected with the negative electrode of the voltage stabilizing diode ZD1 of the electricity taking detection module through the positive electrode of the electrolytic capacitor C1, and the electricity taking module is connected with the input end of the voltage stabilizing module through the positive electrode of the electrolytic capacitor C1. The power taking circuit can reduce working current under the static power taking condition and improve the use performance of a load.
Description
Technical Field
The utility model belongs to the technical field of electronics, and relates to a single-live-wire on-state power taking circuit.
Background
The single live wire switch is an electronic wall switch, is an updated product of the traditional mechanical button type wall switch, can realize more intelligent and more convenient operation functions, and can be used for controlling illumination by touching. However, the single live wire switch is connected in series to the power grid to provide power for the control circuit, that is, no matter in a standby state or when the switch is opened, the current needs to be ensured to flow through the control circuit, however, when the current flowing through the single live wire switch is too large, the electric appliance cannot work normally, common problems such as intermittent flickering of the lamp and the like are caused, and the intelligent switch cannot work normally due to too small current, so the field of power taking of the single live wire is related. Single live wire power extraction includes two aspects: static electricity is taken when the lamp is turned off, and on-state electricity is taken when the lamp is turned on.
A single live wire power supply circuit using electromagnetic relay as disclosed in the existing chinese patent literature [ application number: CN201620056709.8, it relates to a circuit for power taking in the single live wire on state when the lamp is turned on, that is, power taking after the relay is closed. The power taking circuit comprises an electromagnetic relay control circuit, a power taking circuit, a comparison circuit and a switching circuit, wherein one end of the electromagnetic relay control circuit is connected with a live wire, the other end of the electromagnetic relay control circuit is respectively connected with the power taking circuit and the switching circuit, the power taking circuit is connected with the comparison circuit, the switching circuit is connected with the comparison circuit, and the switching circuit is connected with a zero line. In the utility model, the low power consumption electromagnetic relay control circuit is adopted to reduce the power taking requirement, but the power taking circuit adopts the mode that the power supply voltage VCC2 is adopted to provide the signal C for the voltage comparator, and the signal B is provided by the power taking voltage VCC, in such a way, if the triode Q2 is misled, the power taking circuit has the condition of current loss under the static power taking condition, and the power taking circuit cannot intelligently judge whether the power taking circuit successfully takes power, and cannot identify whether loads are good or bad, and if one load LED is damaged, other load LEDs flash, so that the service effect of the lamp is affected.
Disclosure of Invention
The utility model aims at solving the problems in the prior art, and provides a single-live-wire on-state power taking circuit, which aims at solving the technical problems that: how to reduce the working current under the static electricity taking condition and improve the service performance of the load.
The aim of the utility model can be achieved by the following technical scheme: the utility model provides a single live wire open state gets electric circuit, includes switch module, voltage stabilizing module and has comparator one and comparator two's comparison chip, switch module's one end is connected with the live wire through the load, and the other end is connected with the zero line, switch module's the output of comparator one is connected to the control end, is connected with the electricity module of getting that is used for outputting and gets electric voltage VCC between comparator one's homophase input and the load, is connected with the electricity reference voltage module between comparator one's inverting input and voltage stabilizing module's the output, gets electric reference voltage module and still is connected with comparator one's output, and comparator two's homophase input is connected with the output of voltage stabilizing module, and comparator two's inverting input is connected with the electricity detection module still with get electric detection module, and voltage stabilizing module's input and the signal output module who gets electricity and whether succeed for the controller is connected with, and it includes electrolytic capacitor C1 to get electric voltage stabilizing module's signal output module, it includes that electrolytic capacitor C1 gets electric voltage stabilizing module's positive electrode and electrolytic capacitor through the positive electrode voltage stabilizing module and the connection of electric diode 1.
The working principle of the single-live-wire on-state power-taking circuit is as follows: after power-on, the switch module is in a cut-off state at the beginning, so that the voltage on the fire wire firstly charges the electrolytic capacitor C1 in the power-taking module to enable the voltage of the electrolytic capacitor C1 to rise, so that the power-taking voltage VCC can be output, the power-taking voltage VCC provides input voltage for the input end of the voltage stabilizing module, after the electrolytic capacitor C1 is continuously charged, the power-taking module conveys a comparison voltage to the in-phase input end of the comparator I, the voltage stabilizing module conveys a reference voltage to the inverting input end of the comparator I through the power-taking reference voltage module, when the comparison voltage is larger than the reference voltage, the output end of the comparator I outputs high voltage to the control end of the switch module to control the switch module to be conducted, and after the switch module is conducted, the load and the switch module are conducted, so that the power-taking module is successfully powered on; in addition, when the power taking voltage VCC exceeds the voltage stabilizing diode ZD1 in the power taking detection module, the voltage stabilizing diode ZD1 is conducted, then the comparison voltage is transmitted to the inverting input end of the second comparator, meanwhile, the voltage stabilizing module outputs the reference voltage to the non-inverting input end of the second comparator, when the comparison voltage is larger than the reference voltage, the output end of the second comparator outputs low voltage to the signal output module, so that the signal is transmitted to the controller through the signal output module, when the controller receives the signal, the controller judges that the power taking is successful, otherwise, judges that the power taking is unsuccessful, through the circuit structure, intelligent judgment is realized, and in the static power taking situation, the voltage of the input end of the voltage stabilizing module is always zero, the situation that extra current loss exists under the static power taking situation is effectively solved, and the load service performance is better. In the circuit, when the comparison voltage of the first comparator is larger than the reference voltage, the first comparator outputs high voltage to turn on the switch module and simultaneously outputs high voltage to the power taking reference voltage module, so that the power taking reference voltage module is divided, the reference voltage is further reduced, after the switch module is turned on, the electrolytic capacitor C1 is discharged, the comparison voltage transmitted to the first comparator is also reduced, and the circuit is arranged, so that the high voltage output by the output end of the first comparator is maintained within a certain time, the switch module is effectively prevented from being turned on and off frequently, the service life of the switch module is prolonged, and the service performance of a load is also improved. When the comparison voltage of the first comparator is smaller than the reference voltage, low voltage is output to the switch module, the switch module is cut off, the electrolytic capacitor C1 returns to the original charging state, the charging and discharging processes are repeated continuously through the electrolytic capacitor C1, and the power taking voltage VCC has normal voltage output. After judging that the power is successfully taken, the maintenance signal output module outputs a high-voltage signal.
In the single-live-wire on-state power taking circuit, a zener diode ZD2 is further connected between the switch module and the power taking module, a negative electrode of the zener diode ZD2 is connected with the power taking module, and a positive electrode of the zener diode ZD2 is connected with the switch module. After power-on, the voltage on the fire wire charges the electrolytic capacitor C1 in the power taking module, when the voltage of the electrolytic capacitor C1 rises to exceed the voltage stabilizing diode ZD2, the switch module receives a voltage signal, so that the switch module is conducted, the voltage stabilizing diode ZD2 is arranged in the circuit, the charging capacitor C1 can be effectively prevented from continuously charging to exceed the bearable range of each component in the circuit, the effect of protecting the circuit is achieved, and the effect of improving the service performance of the load is further achieved.
In the single-live-wire on-state power taking circuit, the switch module comprises a field effect tube Q1, a capacitor C2 and a resistor R2, wherein the drain electrode of the field effect tube Q1 is connected with a load, the source electrode of the field effect tube Q is connected with a zero line, the grid electrode of the field effect tube Q is connected with the output end of a comparator I in the comparison chip through the capacitor C2, the grid electrode of the field effect tube Q is connected with the positive electrode of a zener diode ZD2, and the resistor R2 is connected at two ends of the capacitor C2 in parallel. The capacitor C2 in the switch module drives pulse current in the switch module, so that the resistor R2 plays a role in maintaining the conducting voltage, and the field effect transistor Q1 works more stably, and the reliability of the circuit is improved.
In the single live wire on-state power taking circuit, the power taking module further comprises a diode D1, a diode D2, a diode D3, a voltage stabilizing diode ZD3, a resistor R3 and a capacitor C3, wherein the anode of the diode D1 is connected with a load, the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the anode of the electrolytic capacitor C1, the cathode of the diode D3 is connected with a power supply pin of the comparison chip, the cathode of the voltage stabilizing diode ZD3 is connected with the anode of the diode D3, the anode of the voltage stabilizing diode ZD3 is grounded after being connected with the capacitor C3, one end of the resistor R3 is grounded, and the other end of the resistor R3 is respectively connected with the anode of the voltage stabilizing diode ZD3 and the same-phase input end of the comparator one of the comparison chip. The voltage on the fire wire is used for unidirectionally charging the electrolytic capacitor C1 through the diode D1, the diode D2 and the diode D3, and the arrangement of the diode D3 can also avoid the leakage phenomenon of the electrolytic capacitor C1, so that the problem of frequent charging and discharging of the electrolytic capacitor C1 is caused, the load works more stably and reliably, and the phenomenon of flicker is avoided; the capacitor C3 is used for storing voltage and filtering, so that a stable voltage signal can be input into the non-inverting input end of the first comparator, the working reliability and stability of the circuit are improved, and the service performance of a load is ensured.
In the single live wire on-state power taking circuit, the power taking module further comprises a capacitor C4, one end of the capacitor C4 is connected with the cathode of the diode D2, and the other end of the capacitor C4 is grounded. The capacitor C4 is used for playing a role of filtering, so that signals input in the circuit are more stable, and the service performance of a load is further guaranteed.
In the above-mentioned single live wire on-state power taking circuit, the power taking detection module further includes a capacitor C5 and a resistor R4, where one end of the capacitor C5 is grounded, the other end of the capacitor C5 is grounded, one end of the resistor R4 is grounded, and the other end of the resistor R4 is connected to the positive electrode of the zener diode ZD1 and the inverting input end of the comparator two in the comparison chip respectively. In the power taking detection module, the negative electrode of the voltage stabilizing diode ZD1 is connected with the positive electrode of an electrolytic capacitor C1 in the power taking module, when the charging voltage of the electrolytic capacitor C1 rises, the power taking voltage VCC is output, when the power taking voltage VCC exceeds the voltage stabilizing diode ZD1, the voltage stabilizing diode ZD1 is conducted, the resistance R4 and the capacitor C5 provide comparison voltage for the inverting input end of the comparator II, the capacitor C5 is used for playing a filtering role, so that the stability of the transmitted comparison voltage is better, the signal output by the signal output module is stable and reliable, and meanwhile, the service performance of a load can be guaranteed.
In the above-mentioned single live wire on-state gets circuit, the signal output module includes triode Q2, resistance R5 and resistance R6, triode Q2's base passes through resistance R5 and is connected with the output of comparator two in the comparison chip, triode Q2's collecting electrode passes through resistance R6 ground connection, triode Q2's collecting electrode still is used for carrying the signal to the controller, triode Q2's projecting pole is connected with voltage stabilizing module's output. When the reference voltage of the non-inverting input end in the second comparator is smaller than the comparison voltage of the inverting input end, the output end outputs low voltage, so that the triode Q2 is conducted, a resistor R6 provides a high voltage signal for the controller, the controller can judge whether the circuit is successful in power taking through the received signal, and when judging that the power taking is successful, the controller can intelligently control the switching-on mode of a switch for controlling whether the load works or not, so that the applicability of the load is ensured.
In the single live wire on-state power taking circuit, the voltage stabilizing module comprises a voltage stabilizing chip U1, a capacitor C6 and a capacitor C7, wherein the input end of the voltage stabilizing chip U1 is connected with the positive electrode of the electrolytic capacitor C1 and used for obtaining power taking voltage VCC, the output end of the voltage stabilizing chip U1 is divided into three paths, one path is connected with the in-phase input end of a comparator II in the comparison chip, the other path is connected with a resistor R1, the other path is connected with the emitting electrode of a triode Q2 in the signal output module, one end of the capacitor C6 and one end of the capacitor C7 are both connected with the output end of the voltage stabilizing chip U1, the other end of the capacitor C6 and the other end of the capacitor C7 are both grounded, and the power supply cathode of the voltage stabilizing chip U1 is grounded. In the circuit, a stable direct current power supply, namely a reference voltage, is provided for the comparison chip through the voltage stabilizing module, so that the stability of circuit control signal output can be further improved, the lamp can be ensured not to flicker, and the service performance of the lamp is improved.
In the above-mentioned single live wire on-state gets circuit, get electric reference voltage module includes triode Q3, resistance R7 and resistance R8, triode Q3's base passes through resistance R7 and is connected with the output of comparator one in the comparison chip, triode Q3's base passes through resistance R7 and is connected with the electric capacity C2 in the switch module, triode Q3's collecting electrode passes through R8 and is connected with the inverting input of comparator one in resistance R1 and the comparison chip respectively, triode Q3's projecting pole ground. When the output end of the first comparator in the comparison chip outputs high voltage, the high voltage signals are respectively transmitted to the switch module and the power-taking reference voltage module, when the base electrode of the field effect transistor Q1 receives the high voltage signals, the field effect transistor Q1 is conducted to provide reference voltage for the inverting input end of the first comparator, the original voltage stabilizing module is converted into the resistor R8 to provide reference voltage for the inverting input end of the first comparator, the reference voltage value is reduced, the fact that the non-inverting input end of the first comparator is still larger than the voltage of the inverting input end within a certain time in the discharging process of the electrolytic capacitor C1 is guaranteed, the switch module is guaranteed to be still in a conducting state, frequent conduction and closing of the switch module are avoided, and the function of protecting the switch module is achieved.
In the single-live-wire on-state power taking circuit, the triode Q2 is a PNP triode, and the triode Q3 is an NPN triode.
In the single live wire on-state power taking circuit, the turn-on voltage of the zener diode ZD1 is smaller than the turn-on voltage of the zener diode ZD 3. The conduction voltage of the zener diode ZD1 is smaller than that of the zener diode ZD3, so that the zener diode ZD1 is in a conduction state in the process of continuously and repeatedly charging and discharging the electrolytic capacitor C1, the load can be ensured to work stably, and the flicker phenomenon is avoided.
Compared with the prior art, the single live wire on-state power-taking circuit has the following advantages:
1. the frequency value of frequent on or off of the field effect transistor in the switch module is within the parameter allowable range under the coordination action of the modules, so that the fluctuation range of the power-taking voltage VCC is ensured to be within the allowable value of the power supply of the system working chip, the stability of the working voltage of the load is ensured, and the lamp does not have a flickering phenomenon.
2. According to the utility model, the voltage stabilizing module is used for providing the reference voltage, so that the condition that the voltage under static power taking is applied to provide the voltage for on-state power taking in the existing power taking circuit is changed, and the current loss of the static power taking is effectively reduced.
3. The application of the zener diode ZD2 in the utility model can also effectively improve the use safety of each module circuit and avoid the damage of each element caused by the overhigh charging voltage of the electrolytic capacitor.
4. The application of the power taking detection module can better solve the problems of judging whether the lamp is good or not and judging whether the power of the lamp is too small.
Drawings
Fig. 1 is a block diagram of the structure of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
In the figure, 1, load; 2. a switch module; 3. comparing the chips; 31. a comparator I; 32. a second comparator; 4. a power taking module; 5. a voltage stabilizing module; 6. a power-on reference voltage module; 7. a power-taking detection module; 8. and a signal output module.
Detailed Description
The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.
As shown in fig. 1, the single live wire on-state power taking circuit comprises a switch module 2, a power taking module 4 for outputting a power taking voltage VCC, a voltage stabilizing module 5, a power taking reference voltage module 6, a power taking detection module 7, a signal output module 8 for transmitting a signal of whether power taking is successful to a controller, and a comparison chip 3 provided with a first comparator 31 and a second comparator 32, wherein one end of the switch module 2 is connected with a live wire through a load 1, the other end of the switch module is connected with a zero line, a control end of the switch module 2 is connected with an output end of the first comparator 31, a power taking module 4 is connected between an in-phase input end of the first comparator 31 and the load 1, a power taking reference voltage module 6 is connected between an inverting input end of the first comparator 31 and an output end of the voltage stabilizing module 5, the non-inverting input end of the second comparator 32 is connected with an output end of the voltage stabilizing module 5, the output end of the voltage stabilizing module 5 is connected with the power taking detection module 7, the power taking detection module 7 is connected with an inverting input end of the second comparator 32, and the input end of the voltage stabilizing module 5 is connected with the output end of the voltage stabilizing module 8 respectively.
As shown in fig. 2, the electricity taking module 4 includes an electrolytic capacitor C1, a diode D2, a diode D3, a voltage stabilizing diode ZD3, a resistor R3 and a capacitor C3, wherein the anode of the diode D1 is connected with the load 1, the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is connected with the anode of the diode D3, the cathode of the diode D3 is connected with the anode of the electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is grounded, the cathode of the diode D3 is connected with a power supply pin of the comparison chip 3, the cathode of the voltage stabilizing diode ZD3 is connected with the anode of the diode D3 and grounded after the anode of the voltage stabilizing diode ZD3 is connected with the capacitor C3, and one end of the resistor R3 is connected with the anode of the voltage stabilizing diode ZD3 and the same phase input end of the comparator one 31 in the comparison chip 3 respectively;
the power taking detection module 7 comprises a voltage stabilizing diode ZD1, a capacitor C5 and a resistor R4, wherein the negative electrode of the voltage stabilizing diode ZD1 is connected with the positive electrode of the electrolytic capacitor C1 and is used for obtaining power taking voltage VCC, the positive electrode of the voltage stabilizing diode ZD1 is connected with one end of the capacitor C5, the other end of the capacitor C5 is grounded, one end of the resistor R4 is grounded, and the other end of the resistor R4 is respectively connected with the positive electrode of the voltage stabilizing diode ZD1 and the inverting input end of a comparator II 32 in the comparison chip 3; the power taking module 4 is connected with the input end of the voltage stabilizing module 5 through the positive electrode of the electrolytic capacitor C1 and is used for providing input voltage, namely power taking voltage VCC.
As a preferred scheme, the power taking module 4 further comprises a capacitor C4, one end of the capacitor C4 is connected with the cathode of the diode D2, and the other end is grounded. The capacitor C4 is used for playing a role of filtering, so that signals input in the circuit are more stable, and the service performance of a load is further guaranteed.
As a preferable scheme, a zener diode ZD2 is further connected between the switch module 2 and the power taking module 4, a cathode of the zener diode ZD2 is connected with the power taking module 4, and an anode of the zener diode ZD2 is connected with the switch module 2. After power-on, the voltage on the fire wire charges the electrolytic capacitor C1 in the power taking module 4 at first, when the voltage of the electrolytic capacitor C1 rises to exceed the voltage stabilizing diode ZD2, the switch module 2 receives a high-voltage signal, so that the switch module 2 is conducted, the voltage stabilizing diode ZD2 is arranged in a circuit, the charging capacitor C1 can be effectively prevented from continuously charging to exceed the bearable range of each component in the circuit, the effect of protecting the circuit is achieved, and the effect of improving the service performance of the load is further achieved.
The switch module 2 includes a field effect transistor Q1, a capacitor C2 and a resistor R2, where a drain electrode of the field effect transistor Q1 is connected with the load 1, a source electrode is connected with a zero line, a gate electrode is connected with an output end of a comparator one 31 in the comparison chip 3 through the capacitor C2, the gate electrode is connected with an anode of the zener diode ZD2, and the resistor R2 is connected in parallel with two ends of the capacitor C2. The capacitor C2 in the switch module 2 drives the pulse current in the switch module 2, so that the resistor R2 plays a role in maintaining the on voltage, and the field effect transistor Q1 works more stably, and the reliability of the circuit is improved.
The signal output module 8 comprises a triode Q2, a resistor R5 and a resistor R6, wherein a base electrode of the triode Q2 is connected with an output end of a second comparator 32 in the comparison chip 3 through the resistor R5, a collector electrode of the triode Q2 is grounded through the resistor R6, the collector electrode of the triode Q2 is further used for transmitting signals to the controller, and an emitter electrode of the triode Q2 is connected with an output end of the voltage stabilizing module 5. Wherein, triode Q2 adopts PNP type triode. When the reference voltage of the non-inverting input end in the second comparator 32 is smaller than the comparison voltage of the inverting input end, the output end outputs a low-level signal, so that the triode Q2 is conducted, a resistor R6 provides a high-voltage signal for the controller, the controller can judge whether the circuit is successful in power taking through the received signal, and when judging that the power taking is successful, the controller can intelligently control the on mode of a switch for controlling the load 1 to work or not, so that the work applicability of the load 1 is ensured.
The voltage stabilizing module 5 comprises a voltage stabilizing chip U1, a capacitor C6 and a capacitor C7, wherein the input end of the voltage stabilizing chip U1 is connected with the positive electrode of the electrolytic capacitor C1 and used for obtaining electricity taking voltage VCC, the output end of the voltage stabilizing chip U1 is divided into three paths, one path is connected with the in-phase input end of a comparator II 32 in the comparison chip 3, the other path is connected with a resistor R1, the other path is connected with the emitting electrode of a triode Q2 in the signal output module 8, one end of the capacitor C6 and one end of the capacitor C7 are both connected with the output end of the voltage stabilizing chip U1, the other end of the capacitor C6 and the other end of the capacitor C7 are both grounded, and the power supply cathode of the voltage stabilizing chip U1 is grounded. In the circuit, a stable direct current power supply, namely a reference voltage, is provided for the comparison chip 3 through the voltage stabilizing module 5, so that the stability of circuit control signal output can be further improved, the lamp can be ensured not to flicker, and the service performance of the lamp is improved.
The power taking reference module 6 comprises a triode Q3, a resistor R7 and a resistor R8, wherein a base electrode of the triode Q3 is connected with an output end of a first comparator 31 in the comparison chip 3 through the resistor R7, a base electrode of the triode Q3 is connected with a capacitor C2 in the switch module 2 through the resistor R7, a collector electrode of the triode Q3 is respectively connected with a resistor R1 and an inverted input end of the first comparator 31 in the comparison chip 3 through the resistor R8, and an emitter electrode of the triode Q3 is grounded. The triode Q3 is an NPN triode. When the output end of the first comparator 31 in the comparison chip 3 outputs high voltage, the high voltage signals are respectively transmitted to the switch module 2 and the electricity taking reference module 6, when the base electrode of the field effect transistor Q1 receives the high voltage signals, the field effect transistor Q1 is conducted, the reference voltage is provided for the inverting input end of the first comparator 31, the original voltage stabilizing module 5 is converted into the reference voltage provided for the inverting input end of the first comparator 31 by the resistor R8, the reference voltage value is reduced, the fact that the non-inverting input end of the first comparator 31 is still larger than the voltage of the inverting input end within a certain time in the discharging process of the electrolytic capacitor C1 is ensured, the switch module 2 is ensured to be still in a conducting state, frequent conduction and closing of the switch module 2 are avoided, and the function of protecting the switch module is achieved.
Preferably, the turn-on voltage of zener diode ZD1 is greater than the turn-on voltage of zener diode ZD 3. The voltage stabilizing diode ZD1 has a conducting voltage greater than that of the voltage stabilizing diode ZD3, and in the initial charging process, the second comparator 32 outputs the overturning voltage before the first comparator 31, so that the voltage stabilizing diode ZD1 is in a conducting state in the process of continuously and repeatedly charging and discharging the electrolytic capacitor C1, the load 1 can be ensured to work stably, and the flicker phenomenon is avoided.
Preferably, the comparison chip 3 employs a dual operational amplifier U1 of LM358 or a dual voltage comparator U1 of LM 393.
As shown in fig. 2, the single live wire on-state power taking circuit mainly comprises a power taking circuit which is composed of a power taking module 4, a switch module 2, a first comparator 31 of a comparison chip 3, a power taking reference voltage module 6 and a voltage stabilizing module 5 and is used for taking voltage, and a power taking detection circuit which is composed of a power taking detection module 7, a signal output module 8, a second comparator 32 of the comparison chip 3 and the voltage stabilizing module 5 and is used for judging whether power taking in a circuit is successful or not. The specific circuit connection mode of the single live wire on-state power supply circuit is as follows:
one end of the load 1 is connected with a fire wire, the other end of the load 1 is respectively connected with the anode of the diode D1 and the drain electrode of the field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected with a zero line, the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is divided into three paths, one path is connected with one end of the capacitor C4, the other end of the capacitor C4 is grounded, the second path is connected with the cathode of the voltage stabilizing diode ZD3, the third path is connected with the anode of the diode D3, the cathode of the diode D3 is respectively connected with the anode of the electrolytic capacitor C1 and the power supply pin of the comparison chip 3, the cathode of the electrolytic capacitor C1 is grounded, the anode of the electrolytic capacitor C1 outputs a power taking voltage VCC, the power taking voltage VCC is respectively connected with the cathode of the voltage stabilizing diode ZD1 and the input end 2 pin of the voltage stabilizing chip U1, the output end 3 pin of the voltage stabilizing chip U1 is connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 and the other end of the capacitor C7 are grounded, and the grounding pin 1 pin of the voltage stabilizing chip U1 is grounded; the output end 3 pin of the voltage stabilizing chip U1 is further divided into three paths, one path is connected with the in-phase input end 3 pin of the second comparator 32 of the comparison chip 3, the second path is connected with the emitter of the triode Q2, the base of the triode Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the output end 1 pin of the second comparator 32, the collector of the triode Q2 is led out of a signal wire and used for conveying detection signals to a controller, the other path is connected with the resistor R6 in series and then grounded, the third path of the output end 3 pin of the voltage stabilizing chip U1 is connected with one end of the resistor R1, the other end of the resistor R1 is respectively connected with the inverting input end 6 pin of the first comparator 31 and one end of the resistor R8, the other end of the resistor R8 is connected with the collector of the triode Q3, the emitter of the triode Q3 is grounded, the base of the triode Q3 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the output end 7 pin of the first comparator 31, the output end 7 pin of the first comparator 31 is also connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the other end of the capacitor C2 in parallel with the other end of the capacitor C3, and the other end of the capacitor C3 is connected with the other end 3 of the capacitor C3 of the resistor is connected with the positive end of the resistor 3; the negative electrode of the zener diode ZD2 is connected with the negative electrode of the diode D2, and the positive electrode of the zener diode ZD2 is connected with the gate of the field effect transistor Q1.
The working principle of the single-live-wire on-state power-taking circuit is as follows:
in the description of the load 1 as an electric lamp, when the electric lamp is started to be powered on, the field effect transistor Q1 is in an off state, and the voltage on the fire wire is charged to the electrolytic capacitor C1 through the diode D1, the diode D2 and the diode D3, so that the voltage of the electrolytic capacitor C1 is gradually increased, and the power taking voltage VCC is output. When the voltage of the electrolytic capacitor C1 continues to rise to exceed the voltage stabilizing diode ZD3, the voltage stabilizing diode ZD3 is conducted, a resistor R3 provides comparison voltage for the in-phase input end of a first comparator 31 in the comparison chip 3, meanwhile, the power taking voltage VCC provides input voltage for the input end of the voltage stabilizing module 5, after the voltage stabilizing chip U1 converts, the output end of the voltage stabilizing module 5 provides reference voltage for the inverting input end of the first comparator 31, when the comparison voltage of the in-phase input end of the first comparator 31 is larger than the reference voltage of the inverting input end, the output end of the first comparator 31 outputs high voltage, the high voltage signal is divided into two paths, one path is transmitted to the field effect transistor Q1 through the capacitor C2 and the resistor R2, the other path is transmitted to the triode Q3 through the resistor R7, and the triode Q3 is conducted. When the field effect transistor Q1 is turned on, the voltage at the positive terminal of the diode D1 becomes zero, the electrolytic capacitor C1 will discharge, the voltage at the electrolytic capacitor C1 will slowly decrease, the comparison voltage at the non-inverting input terminal of the comparator 31 will decrease, meanwhile, after the triode Q3 is turned on, the reference voltage at the inverting input terminal of the comparator 31 is obtained by dividing the voltage through the resistor R1 and the resistor R8, the reference voltage is converted into the voltage provided by the voltage stabilizing module 5, the reference voltage at the inverting input terminal of the comparator 31 will decrease, the output terminal of the comparator 31 will still output a high voltage within a certain period, when the voltage at the non-inverting input terminal of the comparator 31 is smaller than the voltage at the inverting input terminal after the electrolytic capacitor C1 continues to discharge, the output terminal of the comparator 31 outputs a low voltage, the field effect transistor Q1 is turned off, and the voltage on the fire line is charged to the electrolytic capacitor C1 by the diode D1, the diode D2 and the diode D3, and the charging and discharging processes of the electrolytic capacitor C1 will be repeated.
The electrolytic capacitor C1 continuously repeats the charging and discharging processes, the power taking voltage VCC has normal voltage output, when the power taking voltage VCC exceeds the conducting voltage of the voltage stabilizing diode ZD1, the voltage stabilizing diode ZD1 is conducted, the resistor R4 and the capacitor C5 transmit the comparison voltage to the inverting input end of the second comparator 32 in the comparison chip 3, meanwhile, the power taking voltage VCC provides the input voltage to the input end of the voltage stabilizing chip U1 in the voltage stabilizing module 5, the output end of the voltage stabilizing chip U1 transmits the reference voltage to the non-inverting input end of the second comparator 32, when the voltage of the non-inverting input end of the second comparator 32 is smaller than the voltage of the inverting input end, the output end of the first comparator 31 in the comparison chip 3 outputs a low-level signal, the triode Q2 is conducted, the resistor R6 transmits the high-voltage signal to the controller, namely the signal of successful power taking is transmitted to the controller, and the controller can adopt a singlechip.
In the control circuit, the conducting voltage of the zener diode ZD1 is smaller than that of the zener diode ZD3, when the electrolytic capacitor C1 returns to a charging state, the power taking voltage VCC is still larger than that of the zener diode ZD1, and after power taking is successful, the signal transmitted to the controller by the signal output module 8 is stable and unchanged, so that the controller can transmit a stable signal to the single-live wire switch.
The existing single-live wire switch is mainly divided into two types, namely a controllable silicon control lamp is adopted, and a relay is adopted to control the lamp. When the controllable silicon is used for controlling the electric lamp, the current of the electric lamp flows through the controllable silicon, so that the controllable silicon heats. The higher the power of the electric lamp, the larger the heating of the silicon controlled rectifier and the higher the temperature rise, so the silicon controlled rectifier can only control the electric lamp within 100W, and can not control the electric lamp with high power, such as a crystal lamp and a ceiling lamp. If a relay is used, the voltage is more than 1000W, and the problem of the silicon controlled rectifier is easily solved. Both switches can only be selected according to the power level of the lamp.
In the utility model, as a preferred scheme, a single live wire switch is used for controlling an electric lamp by adopting a composite switch, the composite switch comprises a bidirectional silicon controlled rectifier and a relay, the bidirectional silicon controlled rectifier is connected with a load 1 in series in a commercial power, the control end of the bidirectional silicon controlled rectifier is connected with the output end of a singlechip, the normally open contact of the relay is connected with the two ends of the bidirectional silicon controlled rectifier in parallel, one end of a coil of the relay is connected with an electric voltage VCC, and the other end of the coil of the relay is connected with the output end of a controller for controlling the normally open contact of the relay to be switched on or off through the controller. The power taking circuit is matched with the compound switch, the compound switch can be controlled by a silicon controlled rectifier or a relay according to the power of the electric lamp through the power taking circuit, and the working principle of the power taking circuit matched with the compound switch is as follows: when a low-power electric lamp is selected, the charging voltage of the electrolytic capacitor C1 possibly cannot reach the conducting voltage of the zener diode ZD3, that is, the power is not successfully taken, at the moment, the controller controls the silicon controlled rectifier to conduct, the electric lamp is controlled to work, if the controller receives a signal that the power is successfully taken, the controller controls the relay to conduct, and the electric lamp is controlled to work through the relay. The circuit for taking out the electric lamp effectively improves the applicability of the electric lamp.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Claims (10)
1. The utility model provides a single live wire on-state electricity taking circuit, including switch module (2), steady voltage module (5) and have comparator I (31) and comparator II (32) comparison chip (3), switch module (2) one end is connected with the live wire through load (1), the other end is connected with the zero line, switch module (2) control end is connected with comparator I (31) output, be connected with electricity taking module (4) that are used for outputting electricity taking voltage VCC between the homophase input of comparator I (31) and load (1), be connected with electricity taking reference voltage module (6) between the inverting input of comparator I (31) and the output of steady voltage module (5), electricity taking reference voltage module (6) still is connected with the output of comparator I (31), the homophase input of comparator II (32) is connected with the output of steady voltage module (5), the inverting input of comparator II (32) is connected with electricity taking detection module (7), the output of steady voltage module (5) still is connected with electricity taking detection module (7), be connected with electricity taking module (4) output signal C respectively, the electricity taking reference voltage module (3) is connected with the output of electricity taking module (8) respectively, the electricity taking reference voltage module (32) is connected with the output of electricity taking module (8) respectively, the power taking detection module (7) comprises a voltage stabilizing diode ZD1, the power taking module (4) is connected with the negative electrode of the voltage stabilizing diode ZD1 of the power taking detection module (7) through the positive electrode of the electrolytic capacitor C1, and the power taking module (4) is connected with the input end of the voltage stabilizing module (5) through the positive electrode of the electrolytic capacitor C1; the controller is connected with a single live wire switch, the single live wire switch controls a load (1) by adopting a composite switch, the composite switch comprises a bidirectional thyristor and a relay, the bidirectional thyristor is connected with the load (1) in series in the mains supply, the control end of the bidirectional thyristor is connected with the output end of the controller, the normally open contact of the relay is connected with the two ends of the bidirectional thyristor in parallel, one end of a coil of the relay is connected with an electric voltage VCC, and the other end of the coil of the relay is connected with the output end of the controller and is used for controlling the normally open contact of the relay to be switched on or switched off by the controller.
2. The single live wire on-state power taking circuit according to claim 1, wherein a zener diode ZD2 is further connected between the switch module (2) and the power taking module (4), a negative electrode of the zener diode ZD2 is connected with the power taking module (4), and a positive electrode of the zener diode ZD2 is connected with the switch module (2).
3. The single live wire on-state power taking circuit according to claim 2, wherein the switch module (2) comprises a field effect transistor Q1, a capacitor C2 and a resistor R2, the drain electrode of the field effect transistor Q1 is connected with the load (1), the source electrode is connected with a zero line, the grid electrode is connected with the output end of a comparator I (31) in the comparison chip (3) through the capacitor C2, the grid electrode is connected with the positive electrode of a zener diode ZD2, and the resistor R2 is connected at two ends of the capacitor C2 in parallel.
4. A single live wire on-state power taking circuit according to claim 1, 2 or 3, wherein the power taking module (4) further comprises a diode D1, a diode D2, a diode D3, a zener diode ZD3, a resistor R3 and a capacitor C3, the positive electrode of the diode D1 is connected with the load (1), the negative electrode of the diode D1 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with the positive electrode of the diode D3, the negative electrode of the diode D3 is connected with the positive electrode of the electrolytic capacitor C1, the negative electrode of the diode D3 is connected with the power supply pin of the comparison chip (3), the negative electrode of the zener diode ZD3 is connected with the positive electrode of the diode D3, the positive electrode of the zener diode ZD3 is connected with the capacitor C3 and then grounded, and the other end of the resistor R3 is respectively connected with the positive electrode of the zener diode ZD3 and the non-inverting input end of the comparator (31) in the comparison chip (3).
5. The single live wire on-state power taking circuit according to claim 4, wherein the power taking module (4) further comprises a capacitor C4, one end of the capacitor C4 is connected with the cathode of the diode D2, and the other end is grounded.
6. A single live wire on-state power taking circuit according to claim 1, 2 or 3, wherein the power taking detection module (7) further comprises a capacitor C5 and a resistor R4, one end of the capacitor C5 is grounded, the other end of the capacitor C5 is connected with the positive electrode of the zener diode ZD1, one end of the resistor R4 is grounded, and the other end of the resistor R4 is respectively connected with the positive electrode of the zener diode ZD1 and the inverting input end of the comparator two (32) in the comparison chip (3).
7. A single live wire on-state power taking circuit according to claim 1, 2 or 3, wherein the signal output module (8) comprises a triode Q2, a resistor R5 and a resistor R6, a base electrode of the triode Q2 is connected with an output end of a comparator two (32) in the comparison chip (3) through the resistor R5, a collector electrode of the triode Q2 is grounded through the resistor R6, a signal wire for transmitting signals to the controller is led out from the collector electrode of the triode Q2, and an emitter electrode of the triode Q2 is connected with an output end of the voltage stabilizing module (5).
8. The single-live-wire on-state power taking circuit according to claim 7, wherein the voltage stabilizing module (5) comprises a voltage stabilizing chip U1, a capacitor C6 and a capacitor C7, the input end of the voltage stabilizing chip U1 is connected with the positive electrode of the electrolytic capacitor C1 and is used for obtaining power taking voltage VCC, the output end of the voltage stabilizing chip U1 is divided into three paths, one path is connected with the non-inverting input end of a comparator II (32) in the comparison chip (3), the other path is connected with a resistor R1, the other path is connected with the emitter of a triode Q2 in the signal output module (8), one end of the capacitor C6 and one end of the capacitor C7 are both connected with the output end of the voltage stabilizing chip U1, the other end of the capacitor C6 and the other end of the capacitor C7 are both grounded, and the power supply cathode of the voltage stabilizing chip U1 is grounded.
9. A single live wire on-state power taking circuit according to claim 1, 2 or 3, wherein the power taking reference voltage module (6) comprises a triode Q3, a resistor R7 and a resistor R8, a base electrode of the triode Q3 is connected with an output end of a comparator one (31) in the comparison chip (3) through the resistor R7, a base electrode of the triode Q3 is connected with a capacitor C2 in the switch module (2) through the resistor R7, a collector electrode of the triode Q3 is connected with an inverting input end of the resistor R1 and the comparator one (31) in the comparison chip (3) respectively through the resistor R8, and an emitter electrode of the triode Q3 is grounded.
10. The single live wire on-state power taking circuit according to claim 4, wherein the turn-on voltage of the zener diode ZD1 is smaller than the turn-on voltage of the zener diode ZD 3.
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| CN111162683B (en) * | 2020-01-22 | 2021-09-14 | 上海晶丰明源半导体股份有限公司 | Power conversion circuit and method thereof |
| CN111491423B (en) * | 2020-03-27 | 2022-07-05 | 普联技术有限公司 | Single-fire switch circuit and single-fire switch device |
| CN111885788A (en) * | 2020-07-15 | 2020-11-03 | 深圳市欧瑞博科技股份有限公司 | On-state power taking circuit, intelligent single-live-wire switch module and intelligent single-live-wire switch |
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