CN220292220U - Single fire switch circuit - Google Patents
Single fire switch circuit Download PDFInfo
- Publication number
- CN220292220U CN220292220U CN202321375081.4U CN202321375081U CN220292220U CN 220292220 U CN220292220 U CN 220292220U CN 202321375081 U CN202321375081 U CN 202321375081U CN 220292220 U CN220292220 U CN 220292220U
- Authority
- CN
- China
- Prior art keywords
- module
- resistor
- capacitor
- output end
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 92
- 238000002955 isolation Methods 0.000 claims description 39
- 238000005070 sampling Methods 0.000 claims description 31
- 239000003381 stabilizer Substances 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 4
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The embodiment of the utility model provides a single fire switch circuit, which comprises: the first power module and the control module; the first input end of the first power supply module is connected with a live wire of an input power supply, and the second input end of the first power supply module is connected with the input end of the lamp; the output end of the first power supply module is connected with the control module; the first power supply module is used for converting alternating current input by the input power supply into direct current and providing a voltage signal for the control module; the control module is used for controlling the output current of the single fire switch circuit to be a preset threshold value based on the voltage signal provided by the first power supply module. The output current is controlled at a preset threshold value, and the power consumption of the single-fire switch can be controlled, so that the condition that the lamp is lighted is reduced, and finally, the phenomenon of flashing or haust fire of red wires in the state of turning off the lamp is reduced.
Description
Technical Field
The utility model relates to the technical field of switching circuits, in particular to a single-fire switching circuit.
Background
With the development of science and technology and the progress of society, intelligent switches are widely used, and most of intelligent switches are single-fire switches because domestic switch wiring is a fire wire.
When the power consumption of the single-fire switch is overlarge, the lamp is lightened when extremely small current passes through the lamp because the power of the lamp is very low, so that the lamp is flash or red wire in a lamp-off state, namely 'ghost fire' phenomenon is caused.
Disclosure of Invention
The embodiment of the utility model aims to provide a single fire switch circuit so as to solve the problem that a single fire switch is easy to generate 'ghost fire' in the prior art. The specific technical scheme is as follows:
the embodiment of the application provides a single fire switch circuit, which comprises:
the first power module and the control module;
the first input end of the first power supply module is connected with a live wire of an input power supply, and the second input end of the first power supply module is connected with the input end of the lamp;
the output end of the first power supply module is connected with the control module;
the first power supply module is used for converting alternating current input by the input power supply into direct current and providing a voltage signal for the control module; the control module is used for controlling the output current of the single fire switch circuit to be a preset threshold value based on the voltage signal provided by the first power supply module.
In one possible embodiment, the first power module includes: the control module comprises a PWM control module, a reference power supply module, a feedback module, a sampling module and a comparison module;
the first input end of the high-voltage module is connected with a live wire of an input power supply, the second input end of the high-voltage module is connected with the input end of the lamp, and the output end of the high-voltage module is connected with the input end of the isolation module;
the first output end of the isolation module is connected with the first input end of the PWM control module, and the second output end of the isolation module is connected with the second input end of the PWM control module;
the third output end of the isolation module is grounded, and the fourth output end of the isolation module is connected with the input end of the rectification module;
the first output end of the rectifying module is connected with the first input end of the sampling module, the second output end of the rectifying module is respectively connected with the first input end of the feedback module and the second input end of the sampling module, and the second input end of the comparing module and the input end of the reference power supply module;
the third input end of the PWM control module is connected with the output end of the feedback module;
the output end of the PWM control module is connected with the second input end of the feedback module;
the output end of the sampling module is connected with the first input end of the comparison module;
the output end of the comparison module is connected with the third input end of the feedback module;
the output end of the reference power supply module is connected with the third input end of the comparison module.
In one possible embodiment, the high voltage module includes:
a diac or rectifier bridge, a first resistor, a first capacitor;
the first input end of the bidirectional trigger diode or the rectifier bridge is connected with the live wire, and the second input end of the bidirectional trigger diode or the rectifier bridge is connected with the lamp; the first output end of the diac or the rectifier bridge is connected with the first end of the first resistor, and the second output end of the diac or the rectifier bridge is grounded;
the second end of the first resistor is respectively connected with the first end of the first capacitor and the input end of the isolation module;
the second end of the first capacitor is grounded.
In one possible embodiment, the isolation module includes: a transformer;
the input end of the transformer is connected with the high-voltage module;
the first output end of the transformer is connected with the first input end of the PWM control module;
the second output end of the transformer is connected with the second input end of the PWM control module;
the third output end of the transformer is grounded, and the fourth output end of the transformer is connected with the input end of the rectifying module.
In one possible embodiment, the rectifying module includes:
a Schottky diode having a polar capacitance;
the anode of the Schottky diode is connected with the fourth output end of the isolation module, and the cathode of the Schottky diode is respectively connected with the anode of the polar capacitor and the first input end of the feedback module; the cathode of the polar capacitor is connected with the first input end of the sampling module and the ground wire respectively.
In one possible embodiment, the sampling module comprises:
the second resistor, the third resistor, the second capacitor, the seventh resistor, the fourth capacitor, the eighth resistor and the first operational amplifier;
the first end of the second resistor is connected with the first output end of the rectifying module, and the second end of the second resistor is respectively connected with the first end of the third resistor through a ground wire;
the second end of the third resistor is respectively connected with the first end of the second capacitor and the non-inverting input end of the first operational amplifier;
the second end of the second capacitor is grounded;
the inverting input end of the first operational amplifier is respectively connected with the first end of the seventh resistor, the first end of the fourth capacitor and the first end of the eighth resistor;
the first output end of the first operational amplifier is respectively connected with the second end of the seventh resistor and the second end of the fourth capacitor, and the input end of the comparison module is connected with the second end of the fourth resistor;
the second output end of the first operational amplifier is connected with the second output end of the rectifying module;
a third output end of the first operational amplifier is grounded;
the second end of the eighth resistor is grounded.
In one possible implementation, the comparison module includes:
the MOS transistor comprises a fourth resistor, a second operational amplifier, an eleventh resistor, a thirteenth resistor, a fourteenth resistor, a seventeenth resistor and a MOS transistor; twelfth resistor
The first end of the fourth resistor is connected with the output end of the sampling module, and the second end of the fourth resistor is connected with the non-inverting input end of the second operational amplifier;
the inverting input end of the second operational amplifier is respectively connected with the first end of the eleventh resistor, and the first end of the thirteenth resistor is connected with the inverting input end of the second operational amplifier;
a first output end of the second operational amplifier is connected with a first end of the fourteenth resistor;
the second output end of the second operational amplifier is connected with the second output end of the rectifying module;
a third output end of the second operational amplifier is grounded;
the second end of the eleventh resistor is connected with the output end of the reference power supply module;
the second end of the thirteenth resistor is grounded;
the second end of the fourteenth resistor is connected with the first end of the seventeenth resistor respectively, and the first end of the MOS tube is connected with the second end of the seventeenth resistor;
the second end of the seventeenth resistor is grounded;
the second end of the MOS tube is grounded; the third end of the MOS tube is connected with the first end of the twelfth resistor;
the second end of the twelfth resistor is connected with the third input end of the feedback module.
In one possible implementation, the feedback module includes:
an optocoupler, a zener diode, a fifth resistor, and a sixteenth resistor;
the first end of the fifth resistor is connected with the second output end of the rectifying module, the second end of the fifth resistor is respectively connected with the second end of the optocoupler and the output end of the sampling module, and the cathode of the zener diode is connected;
the anode of the zener diode is connected with the first end of the sixteenth resistor;
the second end of the sixteenth resistor is grounded;
the first end of the optocoupler is connected with the second output end of the rectifying module;
the third end of the optocoupler is connected with the third input end of the PWM control module;
and the fourth end of the optocoupler is connected with the output end of the PWM control module.
In one possible implementation, the PWM control module includes:
the power supply control device comprises a diode, a sixth resistor, a power supply management control submodule, a ninth resistor, a third capacitor, a tenth resistor and a fifth capacitor;
the anode of the diode is connected with the second output end of the isolation module, and the cathode of the diode is connected with the first end of the sixth resistor;
the second end of the sixth resistor is respectively connected with the first end of the third capacitor, the second input end of the feedback module and the third end of the power management control sub-module;
the second end of the third capacitor is grounded;
the second end of the power management control sub-module is respectively connected with the first end of the tenth resistor, the first end of the fifth capacitor and the output end of the feedback module;
the first end of the power management control sub-module, the second end of the tenth resistor, the second end of the fifth capacitor and the second end of the ninth resistor are grounded;
the fifth end of the power management control sub-module is connected with the first end of the ninth resistor;
and the fourth end of the power management control sub-module is connected with the first output end of the isolation module.
In one possible embodiment, the reference power module includes:
fifteenth resistor, seventh capacitor, eighth capacitor, voltage stabilizer, sixth capacitor;
the first end of the fifteenth resistor, the input end of the voltage stabilizer and the first end of the seventh capacitor are all connected with the second output end of the rectifying module;
the second end of the fifteenth resistor is connected with the first end of the eighth capacitor and the control end of the voltage stabilizer respectively;
the output end of the voltage stabilizer and the first end of the sixth capacitor are connected with the third input end of the comparison module;
the second end of the seventh capacitor, the second end of the eighth capacitor, the second end of the sixth capacitor and the grounding end of the voltage stabilizer are grounded.
The single fire switch circuit that this application embodiment provided includes: the first power module and the control module; the first input end of the first power supply module is connected with a live wire of an input power supply, and the second input end of the first power supply module is connected with the input end of the lamp; the output end of the first power supply module is connected with the control module; the first power supply module is used for converting alternating current input by the input power supply into direct current and providing a voltage signal for the control module; the control module is used for controlling the output current of the single fire switch circuit to be a preset threshold value based on the voltage signal provided by the first power supply module. The output current is controlled at a preset threshold value, and the power consumption of the single-fire switch can be controlled, so that the condition that the lamp is lighted is reduced, and finally, the phenomenon of flashing or haust fire of red wires in the state of turning off the lamp is reduced. Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a first schematic diagram of a single fire switch circuit according to an embodiment of the present application;
FIG. 2 is a second schematic diagram of a single fire switch circuit according to an embodiment of the present application;
FIG. 3 is a first schematic diagram of a third single fire switch circuit according to an embodiment of the present application;
fig. 4 is a second partial schematic diagram of a third single fire switch circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, those of ordinary skill in the art will be able to devise all other embodiments that are obtained based on this application and are within the scope of the present utility model.
First, terms in the present application are explained:
AC (Alternating Current ) -DC (Direct Current) circuit: the input alternating voltage is converted into a direct-current low-voltage circuit through a transformer, a PWM (Pulse Width Modulation ) integrated circuit (Integrated Circuit, integrated circuit) and other devices.
And (3) operational amplification: the feedback network is combined to form a certain functional module, and the operational amplifier is usually called an operational amplifier for short.
An optical coupler: is a device that transmits electrical signals over an optical medium, and is also known as a photo-isolator or photo-coupler.
LDO (Low Dropout Regulator, low dropout linear regulator): the voltage sampling circuit, the reference voltage, the error amplifying circuit and the transistor adjusting circuit are a low-dropout linear voltage stabilizer.
And a feedback circuit: the output of the system is returned to the input and the input is changed in some way, affecting the course of the system's function.
In order to reduce the phenomenon of a ghost fire, which occurs when a flash or a red wire is turned off, the embodiment of the present application provides a single fire switch circuit, referring to fig. 1, where the circuit includes:
the first power module and the control module;
the first input end of the first power supply module is connected with a live wire of an input power supply, and the second input end of the first power supply module is connected with the input end of the lamp;
the output end of the first power supply module is connected with the control module;
the first power supply module is used for converting alternating current input by the input power supply into direct current and providing a voltage signal for the control module; the control module is used for controlling the output current of the single fire switch circuit to be a preset threshold value based on the voltage signal provided by the first power supply module.
In the embodiment of the application, the control module is used for controlling the output current to be at the preset threshold value, so that the power consumption of the single-fire switch can be controlled, the condition that the lamp is lighted is reduced, and finally, the phenomenon of flashing or ghosting fire of red filaments in the state of turning off the lamp is reduced.
In one possible embodiment, referring to fig. 2, the first power module includes: the control module comprises a PWM control module, a reference power supply module, a feedback module, a sampling module and a comparison module;
the first input end IN-1 of the high voltage module is connected with a live wire of an input power supply, the second input end IN-2 of the high voltage module is connected with the input end IN of the lamp, and the output end OUT of the high voltage module is connected with the input end IN of the isolation module;
the first output end OUT-1 of the isolation module is connected with the first input end IN-1 of the PWM control module, and the second output end OUT-2 of the isolation module is connected with the second input end IN-2 of the PWM control module;
the third output end OUT-3 of the isolation module is grounded, and the fourth output end OUT-4 of the isolation module is connected with the input end IN of the rectification module;
the first output end OUT-1 of the rectifying module is connected with the first input end IN-1 of the sampling module, the second output end OUT-2 of the rectifying module is respectively connected with the first input end IN-1 of the feedback module and the second input end IN-2 of the sampling module, and the second input end IN-2 of the comparing module and the input end IN of the reference power module;
the third input end IN-3 of the PWM control module is connected with the output end OUT of the feedback module;
the output end OUT of the PWM control module is connected with the second input end IN-2 of the feedback module;
the output end OUT of the sampling module is connected with the first input end IN-1 of the comparison module;
the output end OUT of the comparison module is connected with the third input end IN-3 of the feedback module;
the output terminal OUT of the reference power supply module is connected to the third input terminal IN-3 of the comparison module.
IN fig. 2 represents an input terminal, OUT represents an output terminal, and when a module has a plurality of input terminals, distinction is made based on the need, for example, IN-1 IN a high voltage module, represents a first input terminal of the high voltage module, IN-2 IN the high voltage module, represents a second input terminal of the high voltage module, OUT-1 IN an isolation module, represents a first output terminal of the isolation module, OUT-2 IN the isolation module, represents a second output terminal of the isolation module. The rectifying module comprises 2 output ends, one is a first output end OUT-1, and the other is a second output end OUT-2, and the second output end OUT-2 is represented by three parts because of space limitation in the figure.
The high-voltage module can adopt AC commercial power as input and generate DC ripple voltage of about 310V through a rectifying and filtering circuit.
Isolation module: because the mains voltage has electric shock risk on safety regulations on human bodies, safe low-voltage direct current needs to be coupled through an isolation module; in one example, the isolation module may be an isolation transformer.
And a rectification module: for integrating the alternating voltage into a voltage signal having positive and negative polarities through a rectifier, a diode, etc.
PWM module: for controlling the switching on and off of the switching tube by means of the PWM signal, thereby generating an induced voltage on the isolation module.
Reference power supply module: the method is used for generating a stable voltage with higher precision and can be used as a reference standard.
And a feedback module: for adjusting the input signal with the output signal by means of a regulation mechanism such as negative feedback.
And a sampling module: and the voltage detection circuit is used for performing correlation detection after amplifying the voltage small signal on the sampling resistor.
And a comparison module: for comparing the two voltage signals and outputting high and low level signals by digital quantity according to the comparison result.
In the embodiment of the application, the sampling module is used for collecting the output voltage signal, the comparison between the output voltage signal and the preset voltage value is realized through the comparator, and the comparison result is fed back to the PWM module, so that the duty ratio of the output voltage signal is adjusted by the PWM module, the purpose of stabilizing the output voltage signal is achieved, under the condition that the load resistance is unchanged, the output current is controlled at the preset threshold value according to ohm law I=U/R, the single-fire switching power consumption can be controlled, the lighting condition of the lamp is reduced, and finally the phenomenon of flashing or red-wire ghost fire under the condition of turning off the lamp is reduced.
In one possible embodiment, referring to fig. 3, the high-voltage module includes:
a diac or rectifier bridge DB1, a first resistor R1, a first capacitor C1;
the first input end of the bidirectional trigger diode or the rectifier bridge is connected with the live wire, and the second input end of the bidirectional trigger diode or the rectifier bridge is connected with the lamp; the first output end of the diac or rectifier bridge is connected with the first end of the first resistor, and the second output end of the diac or rectifier bridge is grounded;
the second end of the first resistor is respectively connected with the first end of the first capacitor and the input end of the isolation module;
the second end of the first capacitor is grounded.
In fig. 3, the terminal labeled VCC1 is the second output terminal of the rectifier module. The rectification module integrates alternating voltage into voltage signals with positive and negative polarities, and then outputs the voltage signals to the feedback module, the sampling module, the comparison module and the reference power module respectively.
The first input of diac or rectifier bridge DB1 is interface 2 (AC 2), L represents the hot line, the second input of diac or rectifier bridge DB1 is interface 1 (AC 1), and F1 represents the lamp.
The first output of diac or rectifier bridge DB1 is interface 3 and the second output of diac or rectifier bridge DB1 is interface 4.
The diac or rectifier bridge DB1 may be any type diac or rectifier bridge, for example, diac or rectifier bridge of type UM6B is selected.
The parameters of the first resistor R1 and the first capacitor C1 can be set based on actual conditions.
In one possible embodiment, referring to fig. 3, the isolation module includes: a transformer T1;
the input end of the transformer T1 is connected with the high-voltage module;
the first output end of the transformer T1 is connected with the first input end of the PWM control module;
the second output end of the transformer T1 is connected with the second input end of the PWM control module;
the third output end of the transformer T1 is grounded, and the fourth output end of the transformer T1 is connected with the input end of the rectifying module.
As shown in fig. 3, the input of the transformer corresponds to the interface 1 of the transformer, the first output of the transformer corresponds to the interfaces 2, 3 of the transformer, the second output of the transformer corresponds to the interface 3 of the transformer, the third output of the transformer corresponds to the interface 8 of the transformer, and the fourth output of the transformer corresponds to the interface 7 of the transformer. The model of the transformer can be set based on actual conditions.
In one possible embodiment, referring to fig. 3, the rectification module includes:
a Schottky diode D1 having a polar capacitor CV1;
the anode of the schottky diode D1 is connected to the fourth output end of the isolation module, and the cathode of the schottky diode D1 is connected to the anode of the capacitor CV1 with polarity and the first input end of the feedback module, respectively; the cathode of the polar capacitor CV1 is connected with the first input end of the sampling module and the ground wire respectively.
The parameters of the capacitor CV1 with polarity can be set based on the actual situation.
In one possible embodiment, referring to fig. 4, the sampling module includes:
the second resistor R2, the third resistor R3, the second capacitor C2, the seventh resistor R7, the fourth capacitor C4, the eighth resistor R8 and the first operational amplifier U1A;
the first end of the second resistor is connected with the first output end of the rectifying module, and the second end of the second resistor is respectively connected with the first end of the third resistor through a ground wire;
the second end of the third resistor is respectively connected with the first end of the second capacitor and the non-inverting input end of the first operational amplifier;
the second end of the second capacitor is grounded;
the inverting input end of the first operational amplifier is respectively connected with the first end of the seventh resistor, the first end of the fourth capacitor and the first end of the eighth resistor;
the first output end of the first operational amplifier is respectively connected with the second end of the seventh resistor and the second end of the fourth capacitor, and the input end of the comparison module is connected with the first output end of the fourth resistor;
the second output end of the first operational amplifier is connected with the second output end of the rectifying module;
the third output end of the first operational amplifier is grounded;
the second end of the eighth resistor is grounded.
Parameters of the second resistor R2, the third resistor R3, the second capacitor C2, the seventh resistor R7, the fourth capacitor C4, and the eighth resistor R8 may be set based on actual conditions. The comparator can be any type of comparator. And are not limited thereto.
In one possible implementation, referring to fig. 4, the comparing module includes:
the fourth resistor R4, the second operational amplifier U1B, the eleventh resistor R11, the thirteenth resistor R13, the fourteenth resistor R14, the seventeenth resistor R17 and the MOS tube Q1; a twelfth resistor R12;
the first end of the fourth resistor is connected with the output end of the sampling module, and the second end of the fourth resistor is connected with the non-inverting input end of the second operational amplifier;
the inverting input terminal of the second operational amplifier is connected with the first terminal of the eleventh resistor, and the first terminal of the thirteenth resistor;
a first output end of the second operational amplifier is connected with a first end of the fourteenth resistor;
the second output end of the second operational amplifier is connected with the second output end of the rectifying module;
the third output end of the second operational amplifier is grounded;
the second end of the eleventh resistor is connected with the output end of the reference power supply module;
the second end of the thirteenth resistor is grounded;
the second end of the fourteenth resistor is connected with the first end of the seventeenth resistor respectively, and the first end of the MOS tube is connected with the second end of the seventeenth resistor;
the second end of the seventeenth resistor is grounded;
the second end of the MOS tube is grounded; the third end of the MOS tube is connected with the first end of the twelfth resistor;
the second end of the twelfth resistor is connected with the third input end of the feedback module.
The parameters of the fourth resistor R4, the second operational amplifier U1B, the eleventh resistor R11, the thirteenth resistor R13, the fourteenth resistor R14, the seventeenth resistor R17, the MOS transistor Q1, and the twelfth resistor R12 may be set based on the actual situation. The comparator can be any type of comparator. And are not limited thereto.
Fig. 3 is connected to 4a of fig. 4 by 3a and to 4b of fig. 4 by 3 b. In one possible implementation, referring to fig. 3, the feedback module includes:
an optocoupler U2, a zener diode D3, a fifth resistor R5 and a sixteenth resistor R16;
the first end of the fifth resistor is connected with the second output end of the rectifying module, the second end of the fifth resistor is respectively connected with the second end of the optocoupler and the output end of the sampling module, and the cathode of the zener diode is connected;
the anode of the zener diode is connected with the first end of the sixteenth resistor;
the second end of the sixteenth resistor is grounded;
the first end of the optocoupler is connected with the second output end of the rectifying module;
the third end of the optocoupler is connected with the third input end of the PWM control module;
and the fourth end of the optocoupler is connected with the output end of the PWM control module.
The parameters of the fifth resistor R5 and the sixteenth resistor R16 can be set based on actual conditions. The type of the zener diode may be set based on actual conditions, and is not limited herein.
In one possible implementation, referring to fig. 3, the PWM control module includes:
a diode D2, a sixth resistor R6, a power management control submodule U3, a ninth resistor R9, a third capacitor C3, a tenth resistor R10, and a fifth capacitor C5;
the anode of the diode is connected with the second output end of the isolation module, and the cathode of the diode is connected with the first end of the sixth resistor;
the second end of the sixth resistor is respectively connected with the first end of the third capacitor, the second input end of the feedback module and the third end of the power management control sub-module;
the second end of the third capacitor is grounded;
the second end of the power management control sub-module is respectively connected with the first end of the tenth resistor, the first end of the fifth capacitor and the output end of the feedback module;
a first end of the power management control sub-module, a second end of the tenth resistor, a second end of the fifth capacitor, and a second end of the ninth resistor are grounded;
the fifth end of the power management control sub-module is connected with the first end of the ninth resistor;
the fourth end of the power management control sub-module is connected with the first output end of the isolation module.
Parameters of the sixth resistor R6, the ninth resistor R9, the third capacitor C3, the tenth resistor R10, and the fifth capacitor C5 may be set based on actual conditions, and are not limited herein.
GND is the number 1 pin, FB is the number 2 pin, VCC is the number 3 pin, DRAIN is the number 4 pin, CS is the number 5 pin.
In one possible embodiment, referring to fig. 3, the reference power module includes:
a fifteenth resistor R15, a seventh capacitor C7, an eighth capacitor C8, a regulator U4, and a sixth capacitor C6;
the first end of the fifteenth resistor, the input end of the voltage stabilizer and the first end of the seventh capacitor are all connected with the second output end of the rectifying module;
the second end of the fifteenth resistor is connected with the first end of the eighth capacitor and the control end of the voltage stabilizer respectively;
the output end of the voltage stabilizer and the first end of the sixth capacitor are connected with the third input end of the comparison module;
the second end of the seventh capacitor, the second end of the eighth capacitor, the second end of the sixth capacitor and the grounding end of the voltage stabilizer are grounded.
Parameters of the fifteenth resistor R15, the seventh capacitor C7, the eighth capacitor C8, the regulator U4, and the sixth capacitor C6 may be set based on actual conditions, and are not limited herein.
VOUT is number 1 pin, GND is number 2 pin, CE is number 3 pin, VIN is number 4 pin.
For example, as shown in fig. 3, the AC voltage input from the AC terminal of the high voltage module is integrated into a dc high voltage through the filter capacitor C1 of the rectifier bridge DB 1. Under the action of the PWM control module, the output direct-current high voltage continuously controls the on and off of a switching tube in the power management control sub-module U3; by lenz's law, an alternating voltage without polarity is coupled out on the secondary side of the transformer T1. Under the action of the Schottky diode D1 of the rectifying module and the polar capacitor CV1, the direct-current voltage VCC1 (with larger fluctuation, large ripple and noise) is generated. In order to obtain stable and pure VCC1 voltage, the VCC1 output is regulated in real time through continuous on and off of an optocoupler U2 in a feedback module circuit, so that a stable output voltage is obtained.
In addition, in the reference power supply module, a reference power supply of VCC2 is generated by control of LDO (Low Dropout Regulator, low dropout linear regulator) U4. In the output loop of the AC-DC (direct current) circuit, a second resistor R2 is connected in series as a sampling resistor; when the latter stage has a load current, there is a small voltage on R2. In the sampling module, the voltage small signal in the first operational amplifier U1A may be amplified by the operational amplifier circuit and then output to the second operational amplifier U1B of the subsequent stage. In U1B, the sampled and amplified voltage is compared with the reference of VCC2, and if a high level is output, the duty ratio of an output voltage signal is reduced through a power management control submodule U3; if the output is low level, the power management control submodule U3 increases the duty ratio of the output voltage signal; finally, a dynamic balance is achieved, so that a stable voltage is obtained at the second resistor R2; according to ohm's law U/R formula, a stable current is obtained by reasonably setting the resistance value R, which may be 1mA in one example.
By adopting the single-fire switch circuit, compared with a mode of connecting a capacitor or a power module in parallel on a lamp, the potential safety hazard caused by heating can be reduced, the working energy efficiency of a product is improved, the lamp of a user is not limited, the current in the product is limited to a preset value under the condition that the installation and construction of the lamp are not changed, the phenomenon of flashing or a ghost fire of a red wire in a lamp-off state is reduced, and the circuit cost is low.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.
Claims (10)
1. A single fire switch circuit, the circuit comprising:
the first power module and the control module;
the first input end of the first power supply module is connected with a live wire of an input power supply, and the second input end of the first power supply module is connected with the input end of the lamp;
the output end of the first power supply module is connected with the control module;
the first power supply module is used for converting alternating current input by the input power supply into direct current and providing a voltage signal for the control module; the control module is used for controlling the output current of the single fire switch circuit to be a preset threshold value based on the voltage signal provided by the first power supply module.
2. The circuit of claim 1, wherein the circuit comprises a plurality of capacitors,
the first power module includes: the control module comprises a PWM control module, a reference power supply module, a feedback module, a sampling module and a comparison module;
the first input end of the high-voltage module is connected with a live wire of an input power supply, the second input end of the high-voltage module is connected with the input end of the lamp, and the output end of the high-voltage module is connected with the input end of the isolation module;
the first output end of the isolation module is connected with the first input end of the PWM control module, and the second output end of the isolation module is connected with the second input end of the PWM control module;
the third output end of the isolation module is grounded, and the fourth output end of the isolation module is connected with the input end of the rectification module;
the first output end of the rectifying module is connected with the first input end of the sampling module, the second output end of the rectifying module is respectively connected with the first input end of the feedback module and the second input end of the sampling module, and the second input end of the comparing module and the input end of the reference power supply module;
the third input end of the PWM control module is connected with the output end of the feedback module;
the output end of the PWM control module is connected with the second input end of the feedback module;
the output end of the sampling module is connected with the first input end of the comparison module;
the output end of the comparison module is connected with the third input end of the feedback module;
the output end of the reference power supply module is connected with the third input end of the comparison module.
3. The circuit of claim 2, wherein the high voltage module comprises:
a diac or rectifier bridge, a first resistor, a first capacitor;
the first input end of the bidirectional trigger diode or the rectifier bridge is connected with the live wire, and the second input end of the bidirectional trigger diode or the rectifier bridge is connected with the lamp; the first output end of the diac or the rectifier bridge is connected with the first end of the first resistor, and the second output end of the diac or the rectifier bridge is grounded;
the second end of the first resistor is respectively connected with the first end of the first capacitor and the input end of the isolation module;
the second end of the first capacitor is grounded.
4. The circuit of claim 2, wherein the isolation module comprises: a transformer;
the input end of the transformer is connected with the high-voltage module;
the first output end of the transformer is connected with the first input end of the PWM control module;
the second output end of the transformer is connected with the second input end of the PWM control module;
the third output end of the transformer is grounded, and the fourth output end of the transformer is connected with the input end of the rectifying module.
5. The circuit of claim 2, wherein the rectifying module comprises:
a Schottky diode having a polar capacitance;
the anode of the Schottky diode is connected with the fourth output end of the isolation module, and the cathode of the Schottky diode is respectively connected with the anode of the polar capacitor and the first input end of the feedback module; the cathode of the polar capacitor is connected with the first input end of the sampling module and the ground wire respectively.
6. The circuit of claim 2, wherein the sampling module comprises:
the second resistor, the third resistor, the second capacitor, the seventh resistor, the fourth capacitor, the eighth resistor and the first operational amplifier;
the first end of the second resistor is connected with the first output end of the rectifying module, and the second end of the second resistor is respectively connected with the first end of the third resistor through a ground wire;
the second end of the third resistor is respectively connected with the first end of the second capacitor and the non-inverting input end of the first operational amplifier;
the second end of the second capacitor is grounded;
the inverting input end of the first operational amplifier is respectively connected with the first end of the seventh resistor, the first end of the fourth capacitor and the first end of the eighth resistor;
the first output end of the first operational amplifier is respectively connected with the second end of the seventh resistor and the second end of the fourth capacitor, and the input end of the comparison module is connected with the second end of the fourth resistor;
the second output end of the first operational amplifier is connected with the second output end of the rectifying module;
a third output end of the first operational amplifier is grounded;
the second end of the eighth resistor is grounded.
7. The circuit of claim 2, wherein the comparison module comprises:
the MOS transistor comprises a fourth resistor, a second operational amplifier, an eleventh resistor, a thirteenth resistor, a fourteenth resistor, a seventeenth resistor and a MOS transistor; a twelfth resistor;
the first end of the fourth resistor is connected with the output end of the sampling module, and the second end of the fourth resistor is connected with the non-inverting input end of the second operational amplifier;
the inverting input end of the second operational amplifier is respectively connected with the first end of the eleventh resistor, and the first end of the thirteenth resistor is connected with the inverting input end of the second operational amplifier;
a first output end of the second operational amplifier is connected with a first end of the fourteenth resistor;
the second output end of the second operational amplifier is connected with the second output end of the rectifying module;
a third output end of the second operational amplifier is grounded;
the second end of the eleventh resistor is connected with the output end of the reference power supply module;
the second end of the thirteenth resistor is grounded;
the second end of the fourteenth resistor is connected with the first end of the seventeenth resistor respectively, and the first end of the MOS tube is connected with the second end of the seventeenth resistor;
the second end of the seventeenth resistor is grounded;
the second end of the MOS tube is grounded; the third end of the MOS tube is connected with the first end of the twelfth resistor;
the second end of the twelfth resistor is connected with the third input end of the feedback module.
8. The circuit of claim 2, wherein the feedback module comprises:
an optocoupler, a zener diode, a fifth resistor, and a sixteenth resistor;
the first end of the fifth resistor is connected with the second output end of the rectifying module, the second end of the fifth resistor is respectively connected with the second end of the optocoupler and the output end of the sampling module, and the cathode of the zener diode is connected;
the anode of the zener diode is connected with the first end of the sixteenth resistor;
the second end of the sixteenth resistor is grounded;
the first end of the optocoupler is connected with the second output end of the rectifying module;
the third end of the optocoupler is connected with the third input end of the PWM control module;
and the fourth end of the optocoupler is connected with the output end of the PWM control module.
9. The circuit of claim 2, wherein the PWM control module comprises:
the power supply control device comprises a diode, a sixth resistor, a power supply management control submodule, a ninth resistor, a third capacitor, a tenth resistor and a fifth capacitor;
the anode of the diode is connected with the second output end of the isolation module, and the cathode of the diode is connected with the first end of the sixth resistor;
the second end of the sixth resistor is respectively connected with the first end of the third capacitor, the second input end of the feedback module and the third end of the power management control sub-module;
the second end of the third capacitor is grounded;
the second end of the power management control sub-module is respectively connected with the first end of the tenth resistor, the first end of the fifth capacitor and the output end of the feedback module;
the first end of the power management control sub-module, the second end of the tenth resistor, the second end of the fifth capacitor and the second end of the ninth resistor are grounded;
the fifth end of the power management control sub-module is connected with the first end of the ninth resistor;
and the fourth end of the power management control sub-module is connected with the first output end of the isolation module.
10. The circuit of claim 2, wherein the reference power module comprises:
fifteenth resistor, seventh capacitor, eighth capacitor, voltage stabilizer, sixth capacitor;
the first end of the fifteenth resistor, the input end of the voltage stabilizer and the first end of the seventh capacitor are all connected with the second output end of the rectifying module;
the second end of the fifteenth resistor is connected with the first end of the eighth capacitor and the control end of the voltage stabilizer respectively;
the output end of the voltage stabilizer and the first end of the sixth capacitor are connected with the third input end of the comparison module;
the second end of the seventh capacitor, the second end of the eighth capacitor, the second end of the sixth capacitor and the grounding end of the voltage stabilizer are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321375081.4U CN220292220U (en) | 2023-05-31 | 2023-05-31 | Single fire switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321375081.4U CN220292220U (en) | 2023-05-31 | 2023-05-31 | Single fire switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220292220U true CN220292220U (en) | 2024-01-02 |
Family
ID=89331450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321375081.4U Active CN220292220U (en) | 2023-05-31 | 2023-05-31 | Single fire switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220292220U (en) |
-
2023
- 2023-05-31 CN CN202321375081.4U patent/CN220292220U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101552560B (en) | Switch voltage stabilizing circuit and control method thereof | |
| US9263939B2 (en) | Capacitor discharging circuit and converter | |
| CN103219878B (en) | A kind of capacitor discharging circuit and power inverter | |
| CN107257600B (en) | Switching device compatible with single-live wire or zero-live wire access and detection circuit | |
| CN106793293B (en) | Dimming device and LED dimming driving power supply | |
| CN112512163A (en) | Output overvoltage protection control circuit and drive circuit | |
| CN111064369A (en) | Switching power supply circuit | |
| CN108882450B (en) | Limiting circuit for highest output power of constant-current LED power supply and constant-current LED power supply circuit | |
| CN205249038U (en) | Drive and control circuit and switching power supply | |
| CN209844850U (en) | Power supply circuit, chip and intelligent switch | |
| CN110429837A (en) | Wide scope input and output AC-DC converter | |
| CN111505370A (en) | Zero-crossing detection circuit, chip, intelligent switch and zero-crossing detection method | |
| CN211018367U (en) | Power-reducible power supply circuit of PD charging protocol | |
| CN203617902U (en) | Integrated buck-flyback type high power factor constant current circuit and device | |
| CN114340077A (en) | LED dimming circuit, dimming LED lamp and LED dimming method based on LED dimming circuit | |
| CN111510002A (en) | Power circuit, chip, intelligent switch and power supply method | |
| CN220292220U (en) | Single fire switch circuit | |
| CN210201485U (en) | Single-live-wire power taking circuit, control circuit and power supply system | |
| CN217037504U (en) | LED dimming circuit and dimming LED lamp | |
| CN111510003A (en) | Power circuit, chip, intelligent switch and power supply method | |
| CN110198135A (en) | Load detecting circuit and the power supply unit with dual output power supply | |
| CN211266785U (en) | Current transformer power taking circuit | |
| CN113328606A (en) | Alternating current input voltage detection circuit | |
| CN114374323A (en) | Isolated power supply circuit and electronic equipment | |
| CN107425741B (en) | AC-DC conversion circuit with low-voltage protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |