CN104049559A - Load control circuit and device - Google Patents
Load control circuit and device Download PDFInfo
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- CN104049559A CN104049559A CN201410251812.3A CN201410251812A CN104049559A CN 104049559 A CN104049559 A CN 104049559A CN 201410251812 A CN201410251812 A CN 201410251812A CN 104049559 A CN104049559 A CN 104049559A
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Abstract
The invention belongs to the field of circuit control and discloses a load control circuit and device. According to the load control circuit and device, after commercial power is purified through a rectification filtering module, the commercial power is converted into a direct current needed by a load; then, the direct current output by the rectification filtering module is boosted through a boosting module, so that the loss of electricity in the circuit is reduced and a voltage obtained after boosting is converted into a voltage needed by the load through the DC-DC transfer circuit; finally, the DC-DC transfer circuit is controlled though a feedback adjusting module to adjust the output voltage according to the input voltage of the load, so that the input voltage of the load is kept stable. The load control circuit is simple in design, enables the load to work stably and efficiently and to be long in service life and enables cost to be saved.
Description
Technical field
The invention belongs to circuit control field, relate in particular to a kind of load control circuit and device.
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Background technology
Along with the fast development of electricity field, the load equipment of various dependence electricity arises at the historic moment, and has met greatly people's production and life requirement.For example, the electric light of family and office space, the motor in manufacturing industry etc. is all the product of electricity field development, brings great convenience to people's life.
But present most load control circuit design is complicated, components and parts are too many, cause larger power attenuation, and the electric current and voltage of control circuit is unstable, easily cause load to damage, and increase cost.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of load control circuit, is intended to solve existing load control circuit complex circuit designs, and components and parts are more, the problem that cost is high.
In order to solve the problems of the technologies described above, the embodiment of the present invention is achieved in that a kind of load control circuit, is connected with load with city's alternating current, and described power circuit comprises:
Rectification filtering module, input end be that alternating current is connected, for the undesired signal of filtering city alternating current and by described city alternating current, be converted to direct current output;
Boost module, first input end is connected with the output terminal of described rectification filtering module, for processing that the direct current of described rectification filtering module output is boosted;
DC-DC translation circuit, input end is connected with the output terminal of described boost module, and output terminal is connected with the input end of described load, for the voltage transitions that described boost module is exported, is the required voltage of described load; And
Feedback regulation module, input end is connected with the input end of described load, and output terminal is connected with the control end of described DC-DC translation circuit, for control described DC-DC translation circuit according to the input voltage of described load, the voltage of output is regulated.
Further; described load control circuit also comprises overvoltage protective module; the input end of described overvoltage protective module is connected with the output terminal of described load; the output terminal of described overvoltage protective module is connected with the second input end of described boost module, controls described boost module interrupt output while being greater than predetermined voltage threshold for the voltage when described load output.
Further, the LED lamp pearl that described load is serial or parallel connection.
Further, the power factor correction circuit that described boost module is booster type.
Further, described current rectifying and wave filtering circuit comprises the first resistance, the first electric capacity and the first bridge rectifier circuit;
The live wire of the first end Gong Jiehouyu city alternating current of the first end of described the first resistance and described the first electric capacity is connected, the second end of described the first resistance is connected with the first input end of described bridge rectifier circuit, the second input end of the zero line of the second Duan Yu city alternating current of described the first electric capacity and described bridge rectifier circuit connects, the low-voltage output end ground connection of described the first bridge rectifier circuit, the output terminal that the high-voltage output terminal of described the first bridge rectifier circuit is described current rectifying and wave filtering circuit.
Further, described current rectifying and wave filtering circuit comprises:
The second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first inductance and the second bridge rectifier circuit;
The first end of described the second electric capacity is connected with zero line with the live wire of city's alternating current respectively with the second end, the first end of described the second electric capacity and the second end connect respectively the first end of the first coil of described the first inductance and the first end of the second coil of described the first inductance, described the 3rd electric capacity is connected between second end and ground of the first coil of described the first inductance, described the 4th electric capacity is connected between second end and ground of the second coil of described the first inductance, the first input end of described the second bridge rectifier circuit and the second input end connect respectively second end of the first coil of described the first inductance and the second end of the second coil of described the first inductance, described the 5th electric capacity is connected between the high-voltage output terminal and low-voltage output end of described the second bridge rectifier circuit, the low-voltage output end ground connection of described the second bridge rectifier circuit, the high-voltage output terminal of described the second bridge rectifier circuit is the output terminal of described current rectifying and wave filtering circuit.
Further, described boost module comprises:
Micro-processor MCV, the first N-type metal-oxide-semiconductor, the first diode, the second diode, the 6th electric capacity, the 7th electric capacity;
The first end of described the 7th electric capacity is the input end of described boost module, the drain electrode of described the first N-type metal-oxide-semiconductor, grid and source electrode connect respectively the second end, Micro-processor MCV and the ground of described the 7th electric capacity, the anode of described the second diode and negative electrode connect respectively the second end of described the 7th electric capacity and the positive pole of described the 6th electric capacity, the minus earth of described the 6th electric capacity, the anode of described the first diode and negative electrode connect respectively the first end of described the 7th electric capacity and the negative electrode of described the second diode, the output terminal that the negative electrode of described the second diode is described boost module.
Further, Micro-processor MCV is pfc controller.
Further, described DC-DC translation circuit comprises:
PWM controller, the second N-type metal-oxide-semiconductor, the 3rd diode, the second inductance and the 8th electric capacity;
The negative electrode of described the 3rd diode is the input end of described DC-DC translation circuit, the drain electrode of described the second N-type metal-oxide-semiconductor, grid and source electrode connect respectively the anode of described the 3rd diode, described PWM controller and ground, the control end of described PWM controller is connected with the output terminal of described feedback regulation module, the second end of described the second inductance and first end connect respectively the drain electrode of described the second N-type metal-oxide-semiconductor and the second end of described the 8th electric capacity, the negative electrode of the 3rd diode described in the first termination of described the 8th electric capacity, the first end of described the 8th electric capacity is the output terminal of described DC-DC translation circuit.
The present invention also aims to provide a kind of load control device, the load control circuit that described device is described above.
In the present invention, by rectification filtering module, the required direct current of load will be converted to after civil power impurity elimination, then by boost module, the direct current of rectification filtering module output is boosted, reduce the loss of electric energy in circuit, by DC-DC translation circuit, by the voltage transitions after boosting, be the required voltage of load, finally by feedback regulation module, according to the input voltage of load, control DC-DC translation circuit the voltage of output is regulated and makes the input voltage of load remain stable.Load control circuit simplicity of design provided by the invention, can make the work of load stability and high efficiency, and load long service life is cost-saving.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the load control circuit that provides of the embodiment of the present invention;
Fig. 2 is the modular structure figure of the load control circuit that provides of another embodiment of the present invention;
Fig. 3 is the circuit structure diagram of the load control circuit that provides of first embodiment of the invention;
Fig. 4 is the circuit structure diagram of the load control circuit that provides of second embodiment of the invention;
Fig. 5 is the circuit structure diagram of the load control circuit that provides of third embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
For technical solutions according to the invention are described, below by specific embodiment, describe.
Fig. 1 shows the modular structure of the load control circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
As shown in Figure 1, the load control circuit that the embodiment of the present invention provides is connected with load 200 with city alternating current AC, comprising:
Rectification filtering module 101, input end be that alternating current is connected, for the undesired signal Bing Jianggai city alternating current of filtering city alternating current, be converted to direct current output;
Boost module 102, first input end is connected with the output terminal of rectification filtering module 101, for processing that the direct current of rectification filtering module 101 outputs is boosted;
DC-DC translation circuit 103, input end is connected with the output terminal of boost module 102, and output terminal is connected with the input end of load 200, for the voltage transitions that boost module 102 is exported, is the required voltage of load 200; And
Feedback regulation module 104, input end is connected with the input end of load 200, and output terminal is connected with the control end of DC-DC translation circuit 103, for control the voltage of 103 pairs of outputs of DC-DC translation circuit according to the input voltage of load 200, regulates.
It should be noted that: in order to improve the driving force that drives load, adopt the direct current of 102 pairs of rectification filtering modules of boost module, 101 outputs to boost, the direct current of output voltage stabilization; Thereby, reduce the power attenuation that large current delivery causes.
Fig. 2 shows the modular structure of the load control circuit that another embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
As shown in Figure 2; the load control circuit that the embodiment of the present invention provides also comprises overvoltage protective module 105; the input end of overvoltage protective module 105 is connected with the output terminal of load 200; the output terminal of overvoltage protective module 105 is connected with the second input end of boost module 102, controls boost module interrupt output while being greater than predetermined voltage threshold for the voltage when load 200 outputs.
In the embodiment of the present invention; overvoltage protective module 105 can real-time guard load 200 be avoided the damage that overvoltage causes; in the embodiment of the present invention; because dividing to fail to be convened for lack of a quorum, branch road loses part electric energy; cause electric energy loss, thus in the embodiment of the present invention overvoltage protection trigger value according to the output voltage values of load.
As one embodiment of the invention, the LED lamp pearl that load 200 is serial or parallel connection, can also be other electronic equipments, includes but not limited to it is LED-backlit, motor etc.
As one embodiment of the invention, the power factor correction circuit that boost module 102 is booster type.
In embodiments of the present invention, for the direct current that the reduces current rectifying and wave filtering circuit 101 output power attenuation in transmitting procedure, the power factor correction circuit that boost module 102 is booster type, the power factor correction circuit of booster type by the direct current of current rectifying and wave filtering circuit 101 output boost, after filtering, the high voltage of stable output, little current DC electricity.
embodiment mono-:
Fig. 3 shows the circuit structure of the load control circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to first embodiment of the invention, and details are as follows:
As one embodiment of the invention, current rectifying and wave filtering circuit 101 comprises the first resistance R 1, the first capacitor C 1 and the first bridge rectifier circuit BD1;
The live wire L of the first end Gong Jiehouyu city alternating current of the first end of the first resistance R 1 and the first capacitor C 1 is connected, the second end of the first resistance R 1 is connected with the first input end of bridge rectifier circuit BD1, the second input end of the zero line N of the second Duan Yu city alternating current of the first capacitor C 1 and bridge rectifier circuit BD1 connects, the low-voltage output end ground connection of the first bridge rectifier circuit BD1, the high-voltage output terminal of the first bridge rectifier circuit BD1 is the output terminal of current rectifying and wave filtering circuit 101.
embodiment bis-:
Fig. 4 shows the circuit structure of the load control circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to second embodiment of the invention, and details are as follows:
As one embodiment of the invention, current rectifying and wave filtering circuit 101 comprises:
The second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the first inductance L 1 and the second bridge rectifier circuit BD2;
The first end of the second capacitor C 2 is connected with zero line N with the live wire L of city's alternating current respectively with the second end, the first end of the second capacitor C 2 and the second end connect respectively the first end of the first coil of the first inductance L 1 and the first end of the second coil of the first inductance L 1, the 3rd capacitor C 3 is connected between second end and ground of the first coil of the first inductance L 1, the 4th capacitor C 4 is connected between second end and ground of the second coil of the first inductance L 1, the first input end of the second bridge rectifier circuit BD2 and the second input end connect respectively second end of the first coil of the first inductance L 1 and the second end of the second coil of the first inductance L 1, the 5th capacitor C 5 is connected between the high-voltage output terminal and low-voltage output end of the second bridge rectifier circuit BD2, the low-voltage output end ground connection of the second bridge rectifier circuit BD2, the high-voltage output terminal of the second bridge rectifier circuit BD2 is the output terminal of current rectifying and wave filtering circuit 101.
In first embodiment of the invention, neutralize in the second embodiment, rectification filtering module 101 is for being converted to direct current after the undesired signal filtering of city's alternating current, for load provides purer galvanic current.
embodiment tri-:
Fig. 5 shows the circuit structure of the load control circuit that third embodiment of the invention provides, third embodiment of the invention is to realize on the basis of second embodiment of the invention, for convenience of explanation, only show the part relevant to third embodiment of the invention, details are as follows:
As one embodiment of the invention, boost module 102 comprises:
Micro-processor MCV, the first N-type metal-oxide-semiconductor Q1, the first diode D1, the second diode D2, the 6th capacitor C 6, the 7th capacitor C 7;
The first end of the 7th capacitor C 7 is the input end of boost module 102, drain electrode, grid and the source electrode of the first N-type metal-oxide-semiconductor Q1 connects respectively the second end, Micro-processor MCV and the ground of the 7th capacitor C 7, the anode of the second diode D2 and negative electrode connect respectively the second end of the 7th capacitor C 7 and the positive pole of the 6th capacitor C 6, the minus earth of the 6th capacitor C 6, the anode of the first diode D1 and negative electrode connect respectively the first end of the 7th capacitor C 7 and the negative electrode of the second diode D2, and the negative electrode of the second diode D2 is the output terminal of boost module 102.
Preferably, the Micro-processor MCV in the embodiment of the present invention is pfc controller.
As one embodiment of the invention, DC-DC translation circuit 103 comprises:
PWM controller, the second N-type metal-oxide-semiconductor Q2, the 3rd diode D3, the second inductance L 2 and the 8th capacitor C 8;
The negative electrode of the 3rd diode D3 is the input end of DC-DC translation circuit 103, drain electrode, grid and the source electrode of the second N-type metal-oxide-semiconductor Q2 connects respectively anode, PWM controller and the ground of the 3rd diode D3, the control end of this PWM controller is connected with the output terminal of feedback regulation module 104, the second end of the second inductance L 2 and first end connect respectively the drain electrode of the second N-type metal-oxide-semiconductor Q2 and the second end of the 8th capacitor C 8, the negative electrode of the first termination the 3rd diode D3 of the 8th capacitor C 8, the first end of the 8th capacitor C 8 is the output terminal of DC-DC translation circuit 103.
The circuit working principle of the load control circuit below third embodiment of the invention being provided describes, and details are as follows:
In embodiments of the present invention, Micro-processor MCV (pfc controller) produces pulse width modulation (PWM) signal, it should be noted that, the dutycycle of pwm signal needs the voltage of output to set after boosting according to booster circuit 102; By this pwm signal, control the conduction and cut-off of the first N-type metal-oxide-semiconductor.
When the first N-type metal-oxide-semiconductor conducting, the direct current of current rectifying and wave filtering circuit 11 outputs arrives ground through the first N-type metal-oxide-semiconductor Q1, when the first N-type metal-oxide-semiconductor Q1 ends suddenly, the 7th capacitor C 7 produces back electromotive force and through the first diode D1, the 6th capacitor C 6 is charged, when the first N-type metal-oxide-semiconductor Q1 is again during conducting, the voltage of booster circuit 102 outputs is: the galvanic voltage of current rectifying and wave filtering circuit 101 outputs adds the voltage of the 7th capacitor C 7; Thereby booster circuit 102 reaches the object of boosting, falling stream, effectively reduced the power attenuation that heavy DC electricity causes in control circuit.
The direct current of exporting due to DC-DC translation circuit 103 is used for directly driving load 200, so the driving voltage that need to need according to load and electric current are adjusted the dutycycle of the pwm signal of PWM controller output, thereby, driving voltage and the electric current of 103 outputs of DC-DC translation circuit and load matched.
In embodiments of the present invention, the pwm signal of exporting by PWM controller is controlled the second N-type metal-oxide-semiconductor Q2 conduction and cut-off; When the second N-type metal-oxide-semiconductor Q2 conducting, the direct current of boost module 102 outputs is through the 8th capacitor C 8, the second inductance L 2 dividing potential drops, and output voltage changes along with the change in voltage of load, and output current is determined according to the electric current of load 200.When the second N-type metal-oxide-semiconductor Q2 ends suddenly, the back electromotive force that the second inductance L 2 produces continues to load 200 outputting drive voltages through the 3rd diode D3; Thereby the pwm signal of PWM controller output is controlled the second N-type metal-oxide-semiconductor conduction and cut-off repeatedly, controls ON time and the closing time of the second N-type metal-oxide-semiconductor Q2 by pwm signal, to meet load group, continue output driving current object, effectively improved efficiency.
The embodiment of the present invention also provides a kind of load control device, comprises above-mentioned load control circuit.
In embodiments of the present invention, by rectification filtering module, the required direct current of load will be converted to after civil power impurity elimination, then by boost module, the direct current of rectification filtering module output is boosted, reduce the loss of electric energy in circuit, by DC-DC translation circuit, by the voltage transitions after boosting, be the required voltage of load, finally by feedback regulation module, according to the input voltage of load, control DC-DC translation circuit the voltage of output is regulated and makes the input voltage of load remain stable.Load control circuit simplicity of design provided by the invention, can make the work of load stability and high efficiency, and load long service life is cost-saving.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make without departing from the inventive concept of the premise some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the present invention by the definite scope of patent protection of submitted to claims.
Claims (10)
1. a load control circuit, is connected with load with city's alternating current, it is characterized in that, described power circuit comprises:
Rectification filtering module, input end be that alternating current is connected, for the undesired signal of filtering city alternating current and by described city alternating current, be converted to direct current output;
Boost module, first input end is connected with the output terminal of described rectification filtering module, for processing that the direct current of described rectification filtering module output is boosted;
DC-DC translation circuit, input end is connected with the output terminal of described boost module, and output terminal is connected with the input end of described load, for the voltage transitions that described boost module is exported, is the required voltage of described load; And
Feedback regulation module, input end is connected with the input end of described load, and output terminal is connected with the control end of described DC-DC translation circuit, for control described DC-DC translation circuit according to the input voltage of described load, the voltage of output is regulated.
2. control circuit as claimed in claim 1; it is characterized in that; described load control circuit also comprises overvoltage protective module; the input end of described overvoltage protective module is connected with the output terminal of described load; the output terminal of described overvoltage protective module is connected with the second input end of described boost module, controls described boost module interrupt output while being greater than predetermined voltage threshold for the voltage when described load output.
3. control circuit as claimed in claim 1, is characterized in that, the LED lamp pearl that described load is serial or parallel connection.
4. control circuit as claimed in claim 1, is characterized in that, the power factor correction circuit that described boost module is booster type.
5. control circuit as claimed in claim 1, is characterized in that, described current rectifying and wave filtering circuit comprises the first resistance, the first electric capacity and the first bridge rectifier circuit;
The live wire of the first end Gong Jiehouyu city alternating current of the first end of described the first resistance and described the first electric capacity is connected, the second end of described the first resistance is connected with the first input end of described bridge rectifier circuit, the second input end of the zero line of the second Duan Yu city alternating current of described the first electric capacity and described bridge rectifier circuit connects, the low-voltage output end ground connection of described the first bridge rectifier circuit, the output terminal that the high-voltage output terminal of described the first bridge rectifier circuit is described current rectifying and wave filtering circuit.
6. control circuit as claimed in claim 1, is characterized in that, described current rectifying and wave filtering circuit comprises:
The second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first inductance and the second bridge rectifier circuit;
The first end of described the second electric capacity is connected with zero line with the live wire of city's alternating current respectively with the second end, the first end of described the second electric capacity and the second end connect respectively the first end of the first coil of described the first inductance and the first end of the second coil of described the first inductance, described the 3rd electric capacity is connected between second end and ground of the first coil of described the first inductance, described the 4th electric capacity is connected between second end and ground of the second coil of described the first inductance, the first input end of described the second bridge rectifier circuit and the second input end connect respectively second end of the first coil of described the first inductance and the second end of the second coil of described the first inductance, described the 5th electric capacity is connected between the high-voltage output terminal and low-voltage output end of described the second bridge rectifier circuit, the low-voltage output end ground connection of described the second bridge rectifier circuit, the high-voltage output terminal of described the second bridge rectifier circuit is the output terminal of described current rectifying and wave filtering circuit.
7. control circuit as claimed in claim 1, is characterized in that, described boost module comprises:
Micro-processor MCV, the first N-type metal-oxide-semiconductor, the first diode, the second diode, the 6th electric capacity, the 7th electric capacity;
The first end of described the 7th electric capacity is the input end of described boost module, the drain electrode of described the first N-type metal-oxide-semiconductor, grid and source electrode connect respectively the second end, Micro-processor MCV and the ground of described the 7th electric capacity, the anode of described the second diode and negative electrode connect respectively the second end of described the 7th electric capacity and the positive pole of described the 6th electric capacity, the minus earth of described the 6th electric capacity, the anode of described the first diode and negative electrode connect respectively the first end of described the 7th electric capacity and the negative electrode of described the second diode, the output terminal that the negative electrode of described the second diode is described boost module.
8. control circuit as claimed in claim 7, is characterized in that, Micro-processor MCV is pfc controller.
9. control circuit as claimed in claim 1, is characterized in that, described DC-DC translation circuit comprises:
PWM controller, the second N-type metal-oxide-semiconductor, the 3rd diode, the second inductance and the 8th electric capacity;
The negative electrode of described the 3rd diode is the input end of described DC-DC translation circuit, the drain electrode of described the second N-type metal-oxide-semiconductor, grid and source electrode connect respectively the anode of described the 3rd diode, described PWM controller and ground, the control end of described PWM controller is connected with the output terminal of described feedback regulation module, the second end of described the second inductance and first end connect respectively the drain electrode of described the second N-type metal-oxide-semiconductor and the second end of described the 8th electric capacity, the negative electrode of the 3rd diode described in the first termination of described the 8th electric capacity, the first end of described the 8th electric capacity is the output terminal of described DC-DC translation circuit.
10. a load control device, is characterized in that, described device comprises the load control circuit as described in claim 1-9 any one.
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| CN201410251812.3A CN104049559A (en) | 2014-06-09 | 2014-06-09 | Load control circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410251812.3A CN104049559A (en) | 2014-06-09 | 2014-06-09 | Load control circuit and device |
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| CN104049559A true CN104049559A (en) | 2014-09-17 |
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| CN201410251812.3A Pending CN104049559A (en) | 2014-06-09 | 2014-06-09 | Load control circuit and device |
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| US9841627B2 (en) | 2015-09-22 | 2017-12-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight module |
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Application publication date: 20140917 |