CN114286472A - Microwave induction constant voltage and constant current LED drive circuit - Google Patents
Microwave induction constant voltage and constant current LED drive circuit Download PDFInfo
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- CN114286472A CN114286472A CN202210104601.1A CN202210104601A CN114286472A CN 114286472 A CN114286472 A CN 114286472A CN 202210104601 A CN202210104601 A CN 202210104601A CN 114286472 A CN114286472 A CN 114286472A
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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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
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Abstract
The invention relates to the technical field of microwave induction, in particular to a microwave induction constant-voltage constant-current LED driving circuit which comprises a DC/DC voltage reduction constant-current control circuit, a microwave induction module and an amplification filter circuit, wherein the microwave induction module comprises a pluggable chip U4, when the circuit is in a working state, if a chip U4 is pulled out or the connection of a chip U4 pin is abnormal, the static electricity generates huge energy at the moment of disconnection of the pin, and at the moment, the amplification filter circuit filters the energy of a corresponding frequency band in the frequency spectrum of the static electricity energy to play a role in protecting the static isolation.
Description
Technical Field
The invention relates to the technical field of microwave induction, in particular to a microwave induction constant-voltage constant-current LED driving circuit.
Background
The microwave induction technology detects whether a person exists in an induction area through microwaves, then controls a lamp connected with the induction area to work, is high in microwave induction sensitivity, long in induction distance, high in reliability, free of a lens and free of influence on the appearance of the lamp when used, and is simple and cheap in physical realization and small in size along with the large-scale application of the microwave semiconductor technology;
however, when a conventional microwave circuit is used, a chip of the microwave sensing module is usually directly connected with a lamp control part, and when the circuit is in a working state, if the chip is pulled out or the contact of chip pins is abnormal, the connection between the chip pins and the circuit is instantly disconnected, and at the moment, static electricity generates huge energy to directly impact the chip, so that the chip is damaged.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problems to be solved by the invention are as follows: the microwave induction constant-voltage constant-current LED driving circuit is provided, and an amplification filter circuit is additionally arranged to perform electrostatic protection and protect a chip.
In order to solve the technical problems, the invention adopts the technical scheme that:
a microwave induction constant-voltage constant-current LED drive circuit comprises a DC/DC voltage reduction constant-current control circuit, a microwave induction module and an amplification filter circuit;
the microwave induction module comprises a pluggable chip U4;
the amplifying and filtering circuit comprises a resistor R38, a capacitor C15, a triode Q2 and a triode Q3;
an output end VO of the chip U4 is electrically connected with a base electrode of a triode Q2, a collector electrode of the triode Q2 is electrically connected with a base electrode of the triode Q3, a collector electrode of the triode Q3 is electrically connected with one end of a resistor R38, the other end of the resistor R38 is electrically connected with one end of a capacitor C15 and a DC/DC step-down constant current circuit respectively, and the other end of the capacitor C15, an emitter electrode of the triode Q2 and an emitter electrode of the triode Q3 are all grounded.
Further, the amplifying and filtering circuit further comprises a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a capacitor C14;
an output end VO of the chip U4 is electrically connected with one end of a resistor R32, the other end of the resistor R32 is respectively and electrically connected with a base electrode of a triode Q2 and one end of a resistor R33, the other end of the resistor R33 is electrically connected with one end of the resistor R34 and one end of the resistor R35 respectively, the other end of the resistor R34 is respectively and electrically connected with the collector of the triode Q2 and the base of the triode Q3, the other end of the resistor R35 is respectively and electrically connected with the collector of the triode Q3 and one end of the resistor R36, the other end of the resistor R36 is respectively and electrically connected with one end of a resistor R37, one end of a capacitor C14 and one end of a resistor R38, the other end of the resistor R38 is respectively and electrically connected with one end of the capacitor C15 and the DC/DC voltage-reducing constant-current control circuit, the emitter of the triode Q2, the emitter of the triode Q3, the other end of the resistor R37, the other end of the capacitor C14 and the other end of the capacitor C15 are all grounded.
Further, the DC/DC voltage reduction constant current circuit comprises a chip U2, a resistor R20 and a capacitor C9;
one end of the resistor R20 is electrically connected with a voltage input end VIN of the chip U2, the other end of the resistor R20 is electrically connected with one end of the capacitor C9 and a timing capacitor access end CT of the chip U2 respectively, and the other end of the capacitor C9 is grounded.
Further, the DC/DC step-down constant current circuit further includes a freewheeling diode D5, a capacitor C10, and a resistor R21;
the negative electrode of the freewheeling diode D5 is respectively and electrically connected with one end of a resistor R21 and a voltage input end VIN of a chip U2, the other end of the resistor R21 is electrically connected with one end of a capacitor C10, and the other end of the capacitor C10 is respectively and electrically connected with the positive electrode of the freewheeling diode D5 and a drain terminal SW of a built-in MOS transistor of the chip U2.
Further, the DC/DC voltage-reducing constant-current circuit further includes an inductor L4, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a polar capacitor CE3, and a capacitor C11;
one end of the inductor L4 is electrically connected to a drain SW of a built-in MOS transistor of the chip U2, the other end of the inductor L4 is electrically connected to one end of a resistor R22, one end of a resistor R24, one end of a resistor R25, and one end of a resistor R26, the other end of the resistor R22 is electrically connected to a reverse current detection terminal CSN of the chip U2, one end of a resistor R23 is electrically connected to a forward current detection terminal CSP of the chip U2, the other end of the resistor R23 is electrically connected to the other end of the resistor R24, the other end of the resistor R25, the other end of the resistor R26, one end of a capacitor C11, the negative electrode of a polar capacitor CE3, and one end of an LED lamp, the positive electrode of the polar capacitor CE3 is electrically connected to the other end of a capacitor C11 and the other end of the LED lamp, and a luminance control terminal DIM of the chip U2 is electrically connected to one end of a capacitor C15 and the other end of the resistor R38.
Further, the microwave module supply circuit is also included;
the microwave module supply circuit comprises a chip U3, a resistor R28, a resistor R29, a resistor R30, a resistor R31, an inductor L5, a capacitor C13, a polar capacitor CE4 and a polar capacitor CE 5;
the voltage input end VIN of the chip U3 is electrically connected to one end of a resistor R28 and the positive electrode of a polar capacitor CE5, the other end of the resistor R28 is electrically connected to the enable end EN of the chip U2 and one end of a resistor R29, the output voltage feedback end FB of the chip U3 is electrically connected to one end of a capacitor C13, one end of a resistor R30 and one end of a resistor R31, the other end of the resistor R30 is electrically connected to the 12V voltage input end of the chip U4, one end of an inductor L5 and the positive electrode of a polar capacitor CE4, the other end of the inductor L5 is electrically connected to a built-in MOS transistor SW of the chip U3, and the negative electrode of the polar capacitor CE4, the negative electrode of the polar capacitor CE5, the other end of the resistor R29, the other end of the capacitor C13 and the other end of the resistor R31 are all grounded.
Further, the flyback converter also comprises a flyback circuit;
the flyback circuit is electrically connected with the microwave module supply circuit and the DC/DC voltage reduction constant current circuit respectively.
Further, the device also comprises an EMC rectifying and filtering circuit;
the EMC rectifying and filtering circuit is electrically connected with the flyback circuit.
The invention has the beneficial effects that:
the microwave induction constant-voltage constant-current LED driving circuit comprises a DC/DC voltage reduction constant-current control circuit, a microwave induction module and an amplification filter circuit, wherein the microwave induction module comprises a pluggable chip U4, when the circuit is in a working state, if the chip U4 is pulled out or the connection of a pin of the chip U4 is abnormal, the static electricity generates huge energy at the moment of disconnection of the pin, and at the moment, the amplification filter circuit filters the energy of a corresponding frequency band in the frequency spectrum of the static electricity energy to play a role in protecting the static isolation.
Drawings
Fig. 1 is a flow chart of a microwave-induced constant-voltage constant-current LED driving circuit;
fig. 2 is a schematic structural diagram of an EMC rectifying and filtering circuit of a microwave-induced constant-voltage constant-current LED driving circuit;
fig. 3 is a schematic structural diagram of a flyback circuit of a microwave-induced constant-voltage constant-current LED driving circuit;
fig. 4 is a schematic structural diagram of a DC/DC step-down constant current circuit of a microwave-induced constant-voltage constant-current LED driving circuit;
fig. 5 is a schematic structural diagram of a microwave module supply circuit of a microwave-induced constant-voltage constant-current LED driving circuit;
fig. 6 is a schematic structural diagram of an amplifying and filtering circuit of a microwave-induced constant-voltage constant-current LED driving circuit.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 6, a microwave-induced constant-voltage constant-current LED driving circuit according to the present invention includes a DC/DC voltage-reduction constant-current control circuit, a microwave-induced module, and an amplification filter circuit;
the microwave induction module comprises a pluggable chip U4;
the amplifying and filtering circuit comprises a resistor R38, a capacitor C15, a triode Q2 and a triode Q3;
an output end VO of the chip U4 is electrically connected with a base electrode of a triode Q2, a collector electrode of the triode Q2 is electrically connected with a base electrode of the triode Q3, a collector electrode of the triode Q3 is electrically connected with one end of a resistor R38, the other end of the resistor R38 is electrically connected with one end of a capacitor C15 and a DC/DC step-down constant current circuit respectively, and the other end of the capacitor C15, an emitter electrode of the triode Q2 and an emitter electrode of the triode Q3 are all grounded.
From the above description, the beneficial effects of the present invention are:
the microwave induction constant-voltage constant-current LED driving circuit comprises a DC/DC voltage reduction constant-current control circuit, a microwave induction module and an amplification filter circuit, wherein the microwave induction module comprises a pluggable chip U4, when the circuit is in a working state, if the chip U4 is pulled out or the connection of a pin of the chip U4 is abnormal, the static electricity generates huge energy at the moment of disconnection of the pin, and at the moment, the amplification filter circuit filters the energy of a corresponding frequency band in the frequency spectrum of the static electricity energy to play a role in protecting the static isolation.
Further, the amplifying and filtering circuit further comprises a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a capacitor C14;
an output end VO of the chip U4 is electrically connected with one end of a resistor R32, the other end of the resistor R32 is respectively and electrically connected with a base electrode of a triode Q2 and one end of a resistor R33, the other end of the resistor R33 is electrically connected with one end of the resistor R34 and one end of the resistor R35 respectively, the other end of the resistor R34 is respectively and electrically connected with the collector of the triode Q2 and the base of the triode Q3, the other end of the resistor R35 is respectively and electrically connected with the collector of the triode Q3 and one end of the resistor R36, the other end of the resistor R36 is respectively and electrically connected with one end of a resistor R37, one end of a capacitor C14 and one end of a resistor R38, the other end of the resistor R38 is respectively and electrically connected with one end of the capacitor C15 and the DC/DC voltage-reducing constant-current control circuit, the emitter of the triode Q2, the emitter of the triode Q3, the other end of the resistor R37, the other end of the capacitor C14 and the other end of the capacitor C15 are all grounded.
As can be seen from the above description, when the microwave module detects that a person passes through, the chip U4 outputs a high level signal, the Q2 is turned on, the Q3 is turned off, the amplifying and filtering circuit outputs a high level signal, the lamp is on, after a certain time, the microwave sensing module does not sense the presence of a person, the VO outputs a low level, the Q2 is turned off, the Q3 is turned on, the amplifying and filtering circuit outputs a low level signal, and the lamp is turned off; the resistor R32 and the resistor R33 are base resistors of a triode Q2 and play a role in current limiting, the resistor R34 is used as a collector resistor of the triode Q2 to limit current and stabilize the static working point of the triode Q2 to avoid distortion, the resistor R35 is used as a collector resistor of the triode Q3 and has the same function as the resistor R34, and the resistor R36, the resistor R37, the resistor R38, the capacitor C14 and the capacitor C15 jointly form a passive RC filter circuit to filter a high-frequency part in an electrostatic energy spectrum and play a role in protecting electrostatic isolation.
Further, the DC/DC voltage reduction constant current circuit comprises a chip U2, a resistor R20 and a capacitor C9;
one end of the resistor R20 is electrically connected with a voltage input end VIN of the chip U2, the other end of the resistor R20 is electrically connected with one end of the capacitor C9 and a timing capacitor access end CT of the chip U2 respectively, and the other end of the capacitor C9 is grounded.
As can be seen from the above description, the resistor R20 and the capacitor C9 function to convert the level of the analog dimming signal into a PWM dimming signal, which is input to the voltage input terminal VIN of the chip U2.
Further, the DC/DC step-down constant current circuit further includes a freewheeling diode D5, a capacitor C10, and a resistor R21;
the negative electrode of the freewheeling diode D5 is respectively and electrically connected with one end of a resistor R21 and a voltage input end VIN of a chip U2, the other end of the resistor R21 is electrically connected with one end of a capacitor C10, and the other end of the capacitor C10 is respectively and electrically connected with the positive electrode of the freewheeling diode D5 and a drain terminal SW of a built-in MOS transistor of the chip U2.
As can be seen from the above description, the freewheeling diode D5, the resistor R21 and the capacitor C10 function to provide a path to avoid sudden changes in load current, and the current can change more gradually to smooth the current.
Further, the DC/DC voltage-reducing constant-current circuit further includes an inductor L4, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a polar capacitor CE3, and a capacitor C11;
one end of the inductor L4 is electrically connected to a drain SW of a built-in MOS transistor of the chip U2, the other end of the inductor L4 is electrically connected to one end of a resistor R22, one end of a resistor R24, one end of a resistor R25, and one end of a resistor R26, the other end of the resistor R22 is electrically connected to a reverse current detection terminal CSN of the chip U2, one end of a resistor R23 is electrically connected to a forward current detection terminal CSP of the chip U2, the other end of the resistor R23 is electrically connected to the other end of the resistor R24, the other end of the resistor R25, the other end of the resistor R26, one end of a capacitor C11, the negative electrode of a polar capacitor CE3, and one end of an LED lamp, the positive electrode of the polar capacitor CE3 is electrically connected to the other end of a capacitor C11 and the other end of the LED lamp, and a luminance control terminal DIM of the chip U2 is electrically connected to one end of a capacitor C15 and the other end of the resistor R38.
As can be seen from the above description, the signal output by the amplifying and filtering circuit controls the on/off of the lamp through the luminance control terminal DIM of the chip U2, the setting and adjustment of the output current of the chip U2 are realized through the resistor R22, the resistor R23, the resistor R24, the resistor R25 and the resistor R26, the energy conversion between circuits is realized through the inductor L4, and the polar capacitor CE3 and the capacitor C11 play a role in filtering, so as to reduce the ripple of the output current.
Further, the microwave module supply circuit is also included;
the microwave module supply circuit comprises a chip U3, a resistor R28, a resistor R29, a resistor R30, a resistor R31, an inductor L5, a capacitor C13, a polar capacitor CE4 and a polar capacitor CE 5;
the voltage input end VIN of the chip U3 is electrically connected to one end of a resistor R28 and the positive electrode of a polar capacitor CE5, the other end of the resistor R28 is electrically connected to the enable end EN of the chip U2 and one end of a resistor R29, the output voltage feedback end FB of the chip U3 is electrically connected to one end of a capacitor C13, one end of a resistor R30 and one end of a resistor R31, the other end of the resistor R30 is electrically connected to the 12V voltage input end of the chip U4, one end of an inductor L5 and the positive electrode of a polar capacitor CE4, the other end of the inductor L5 is electrically connected to a built-in MOS transistor SW of the chip U3, and the negative electrode of the polar capacitor CE4, the negative electrode of the polar capacitor CE5, the other end of the resistor R29, the other end of the capacitor C13 and the other end of the resistor R31 are all grounded.
As can be seen from the above description, the polar capacitor CE5 is externally connected to the chip U3 for supplying power, the resistor R28 and the resistor R29 serve as voltage dividing resistors for providing a high voltage to the enable terminal EN of the chip U3 to enable the chip U3 to operate, the inductor L5 realizes energy conversion, the resistor R30 and the resistor R31 serve as feedback voltage dividing resistors for providing a feedback voltage to the output voltage feedback terminal FB of the chip U3 to control the output voltage, and the capacitor C13 serves as a filter capacitor of the output voltage feedback terminal FB of the chip U3 to filter noise interference.
Further, the flyback converter also comprises a flyback circuit;
the flyback circuit is electrically connected with the microwave module supply circuit and the DC/DC voltage reduction constant current circuit respectively.
Further, the device also comprises an EMC rectifying and filtering circuit;
the EMC rectifying and filtering circuit is electrically connected with the flyback circuit.
Referring to fig. 1 to 6, a first embodiment of the present invention is:
the invention provides a microwave induction constant-voltage constant-current LED drive circuit which comprises an EMC (electro magnetic compatibility) rectification filter circuit 1, a flyback circuit 2, a DC/DC voltage reduction constant-current control circuit 3, a microwave module supply circuit 4, a microwave induction module 5 and an amplification filter circuit 6;
in this embodiment, as shown in fig. 1, the EMC rectifying and filtering circuit 1 is electrically connected to a flyback circuit 2, the flyback circuit 2 is electrically connected to the DC/DC step-down constant current circuit 3 and the microwave module supply circuit 4, the microwave module supply circuit 4 is electrically connected to the microwave induction module 5, the microwave induction module 5 is electrically connected to the amplifying and filtering circuit 6, and the amplifying and filtering circuit 6 is electrically connected to the DC/DC step-down constant current circuit 3.
In this embodiment, as shown in fig. 6, the microwave sensing module 5 includes a pluggable chip U4, and the amplifying and filtering circuit 6 includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C14, a capacitor C15, a transistor Q2, and a transistor Q3;
in this embodiment, the resistance of the resistor R32 is 20k, the resistance of the resistor R33 is 510k, the resistance of the resistor R34 is 10k, the resistance of the resistor R35 is 27k, the resistance of the resistor R36 is 20k, the resistance of the resistor R37 is 27k, the resistance of the resistor R38 is 33k, the capacitance of the capacitor C14 is 2.2uf, the capacitance of the capacitor C15 is 2.2uf, the model of the transistor Q2 is 2N7002, and the model of the transistor Q3 is 2N 7002;
the model number of the chip U4 is HD07S in the embodiment;
an output end VO of the chip U4 is electrically connected with one end of a resistor R32, the other end of the resistor R32 is respectively and electrically connected with a base electrode of a triode Q2 and one end of a resistor R33, the other end of the resistor R33 is electrically connected with one end of the resistor R34 and one end of the resistor R35 respectively, the other end of the resistor R34 is respectively and electrically connected with the collector of the triode Q2 and the base of the triode Q3, the other end of the resistor R35 is respectively and electrically connected with the collector of the triode Q3 and one end of the resistor R36, the other end of the resistor R36 is respectively and electrically connected with one end of a resistor R37, one end of a capacitor C14 and one end of a resistor R38, the other end of the resistor R38 is respectively and electrically connected with one end of a capacitor C15 and the DC/DC voltage-reducing constant-current control circuit 3, the emitter of the triode Q2, the emitter of the triode Q3, the other end of the resistor R37, the other end of the capacitor C14 and the other end of the capacitor C15 are all grounded.
When the microwave module 5 detects that someone passes through, the chip U4 outputs a high level signal, the Q2 is turned on, the Q3 is cut off, the amplifying and filtering circuit 6 outputs a high level signal, the lamp is on, after a certain time, the microwave induction module 5 does not sense the existence of the person, the VO outputs a low level, the Q2 is turned off, the Q3 is turned on, the amplifying and filtering circuit 6 outputs a low level signal, and the lamp is turned off; the resistor R32 and the resistor R33 are base resistors of a triode Q2 and play a role in current limiting, the resistor R34 is used as a collector resistor of the triode Q1 to limit current and stabilize the static working point of the triode Q1 to avoid distortion, the resistor R35 is used as a collector resistor of the triode Q3 and has the same function as the resistor R34, and the resistor R36, the resistor R37, the resistor R38, the capacitor C14 and the capacitor C15 jointly form a passive RC filter circuit to filter a high-frequency part in an electrostatic energy spectrum and play a role in protecting electrostatic isolation.
In the present embodiment, as shown in fig. 4, the DC/DC step-down constant current circuit 3 includes a chip U2, a resistor R20, and a capacitor C9;
in the present embodiment, the resistance of the resistor R20 is 100k, and the capacitance of the capacitor C9 is 100 nf;
in the embodiment, the model number of the chip U2 is QW 2032;
one end of the resistor R20 is electrically connected with a voltage input end VIN of the chip U2, the other end of the resistor R20 is electrically connected with one end of the capacitor C9 and a timing capacitor access end CT of the chip U2 respectively, and the other end of the capacitor C9 is grounded;
the resistor R20 and the capacitor C9 are used for converting the level into a PWM dimming signal when low-brightness analog dimming is realized, and the PWM dimming signal is input to the voltage input end VIN of the chip U2.
The circuit also comprises a freewheeling diode D5, a capacitor C10 and a resistor R21;
the negative electrode of the freewheeling diode D5 is respectively and electrically connected with one end of a resistor R21 and a voltage input end VIN of a chip U2, the other end of the resistor R21 is electrically connected with one end of a capacitor C10, and the other end of the capacitor C10 is respectively and electrically connected with the positive electrode of the freewheeling diode D5 and a drain terminal SW of a built-in MOS transistor of the chip U2.
The freewheeling diode D5, the resistor R21 and the capacitor C10 are used for providing a path, so that sudden change of load current is avoided, the current can change more gradually, and the effect of smoothing the current is achieved.
The circuit also comprises an inductor L4, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a polar capacitor CE3 and a capacitor C11;
in this embodiment, the inductance value of the inductor L4 is 0.26mh, the resistance value of the resistor R22 is 100k, the resistance value of the resistor R23 is 100k, the resistance value of the resistor R24 is 3.3k, the resistance value of the resistor R25 is 3.3k, the resistance value of the resistor R26 is 3.3k, the capacitance value of the polar capacitor CE3 is 47uf, and the capacitance value of the capacitor C11 is 100 nf;
one end of the inductor L4 is electrically connected to a drain SW of a built-in MOS transistor of a chip U2, the other end of the inductor L4 is electrically connected to one end of a resistor R22, one end of a resistor R24, one end of a resistor R25 and one end of a resistor R26, the other end of the resistor R22 is electrically connected to a reverse current detection terminal CSN of the chip U2, one end of a resistor R23 is electrically connected to a forward current detection terminal CSP of the chip U2, the other end of the resistor R23 is electrically connected to the other end of the resistor R24, the other end of the resistor R25, the other end of the resistor R26, one end of a capacitor C11, the negative electrode of a polar capacitor CE3 and one end of an LED lamp, the positive electrode of the polar capacitor CE3 is electrically connected to the other end of a capacitor C11 and the other end of the LED lamp, and a luminance control terminal DIM of the chip U2 is electrically connected to one end of a capacitor C15 and the other end of the resistor R38;
the signal output by the amplifying and filtering circuit 6 controls the on and off of the lamp through a luminance control end DIM of a chip U2, the setting and adjustment of the output current of the chip U2 are realized through a resistor R22, a resistor R23, a resistor R24, a resistor R25 and a resistor R26, the conversion of energy among circuits is realized through an inductor L4, and a polar capacitor CE3 and a capacitor C11 play a role in filtering, so that the ripple of the output current is reduced.
In this embodiment, as shown in fig. 5, the microwave module supply circuit 4 includes a chip U3, a resistor R28, a resistor R29, a resistor R30, a resistor R31, an inductor L5, a capacitor C13, a polar capacitor CE4, and a polar capacitor CE 5;
in this embodiment, the resistance value of the resistor R28 is 681k, the resistance value of the resistor R29 is 20k, the resistance value of the resistor R30 is 100k, the resistance value of the resistor R31 is 20k, the inductance value of the inductor L5 is 1mh, the capacitance value of the capacitor C13 is 100pf, the capacitance value of the polar capacitor CE4 is 47uf, and the capacitance value of the polar capacitor CE5 is 47 uf;
in the present embodiment, the model of the chip U3 is OB2106 MP;
a voltage input end VIN of the chip U3 is electrically connected to one end of a resistor R28 and an anode of a polar capacitor CE5, the other end of the resistor R28 is electrically connected to an enable end EN of the chip U2 and one end of a resistor R29, an output voltage feedback end FB of the chip U3 is electrically connected to one end of a capacitor C13, one end of a resistor R30 and one end of a resistor R31, the other end of the resistor R30 is electrically connected to a 12V voltage input end of the chip U4, one end of an inductor L5 and an anode of a polar capacitor CE4, the other end of the inductor L5 is electrically connected to a built-in MOS transistor SW of the chip U3, and a cathode of a drain end of the polar capacitor CE4, a cathode of the polar capacitor CE5, the other end of the resistor R29, the other end of the capacitor C13 and the other end of the resistor R31 are all grounded;
the polar capacitor CE5 supplies power to the chip U3 in an external mode, the resistor R28 and the resistor R29 serve as voltage dividing resistors to provide a high voltage for an enable end EN of the chip U3, the chip U3 works, the inductor L5 achieves energy conversion, the resistor R30 and the resistor R31 serve as feedback voltage dividing resistors to provide a feedback voltage for an output voltage feedback end FB of the chip U3 to control output voltage, and the capacitor C13 serves as a filter capacitor of the output voltage feedback end FB of the chip U3 to filter out clutter interference.
In this embodiment, the flyback circuit 2 is connected as shown in fig. 3, and the resistor R2, the resistor R3, the resistor R4, the resistor R8, the polar capacitor CE1, the diode D1, and the transformer auxiliary winding TR1C form a power supply circuit; a resistor R6, a resistor R7 and a capacitor C4 form a divider resistor network to detect the zero crossing point of the voltage and the inductive current of the auxiliary winding TR1C of the transformer, and the divider resistor network has the function of overvoltage protection; the resistor R5, the capacitor C2 and the capacitor C3 form a loop compensation circuit, the duty ratio of pulse voltage is controlled through loop feedback to adjust output voltage, and meanwhile, the protection effect is achieved; the resistor R15 and the capacitor C7 form an RC filter circuit to filter out interference signals; a driving output pin GATE of the chip U1 controls the switching of the field effect transistor Q1 through a resistor R12, a resistor R13, a resistor R14 and a diode D3; the resistor R9, the resistor R10, the resistor R11, the capacitor C6 and the diode D2 form an RCD absorption circuit, and peak voltage generated by leakage inductance of the transformer TR1 is absorbed; the diode D4 and the polar capacitor CE2 realize rectification and filtering of output, the resistor R18 and the resistor C8 form an RC absorption circuit, and the resistor R19 is a dummy load;
in the present embodiment, the model number of the chip U1 is BP 3609.
In the present embodiment, the EMC rectifying-filtering circuit 1 is connected as shown in fig. 2, and the thermal relay FR1 provides an abnormal protection for the power supply; the common-mode inductor L1 filters the influence of common-mode interference signals on a post-stage circuit, and filters the influence of electromagnetic interference generated by the post-stage circuit on a power grid; the capacitor CX1, the inductor L2, the resistor R1, the voltage dependent resistor RV1, the bridge rectifier circuit BD1 and the capacitor C1 provide EMC filtering and alternating current rectification for the circuit.
The principle of the microwave induction constant-voltage constant-current LED driving circuit provided by the invention is as follows:
microwave induction module 5: when a wave with a certain frequency touches an obstacle, a part of the wave is reflected, if the obstacle is static, the wavelength of the reflected wave is constant, if the obstacle moves towards a wave source, the wavelength of the reflected wave is shorter than that of the wave source, if the obstacle moves towards a direction far away from the wave source, the wavelength of the reflected wave is longer than that of the wave source, the change of the wavelength means the change of the frequency, and the microwave sensing module 5 judges that a moving object approaches or leaves through the change of the reflected wave.
The chip U2 can realize continuous current mode voltage reduction constant current driving with high current precision; the resistor R20 and the capacitor C9 are used for converting the level into a PWM dimming signal when low-brightness analog dimming is realized, and the PWM dimming signal is input to a voltage input end VIN of the chip U2; the freewheeling diode D5, the resistor R21 and the capacitor C10 are used for providing a path, so that sudden change of load current is avoided, the current can change more smoothly, and the effect of smoothing the current is achieved; the resistor R22, the resistor R23, the resistor R24, the resistor R25 and the resistor R26 realize the setting and adjustment of the output current of the chip U2, the inductor L4 realizes the energy conversion among circuits, the polar capacitor CE3 and the capacitor C11 play a role in filtering, and the output current ripple is reduced; the chip U2 controls the operation and stop of the chip through the signal received by the luminance control terminal DIM, and when the level is high, the chip U2 operates, and when the level is low, the chip U2 enters the standby mode.
The current supplies power for the DC/DC voltage reduction constant current control circuit 3 after passing through the EMC rectification filter circuit 1 and the flyback circuit 2, the EMC rectification filter circuit 1 realizes EMC filtration and alternating current rectification, and the flyback circuit 2 only stores energy but does not transfer energy during the conduction period of the main switching tube; transferring energy to the load during the period that the main switching tube is turned off;
when the microwave sensing module 5 detects that a person passes through, the chip U4 outputs a high level signal, the triode Q2 is turned on, the triode Q3 is turned off, at this time, the Q3 is equivalent to an open circuit, the voltage at the output end is provided by a 12V external power supply and the divided voltage of the rest of resistors, the output of the amplifying and filtering circuit 6 is high level, the luminance control end DIM of the chip U2 receives the high level, the chip U2 starts to work, and the lamp is on; after a certain time, the microwave sensing module 5 does not sense the existence of people, the chip U4 outputs a low level signal, the Q2 is cut off, the Q3 is turned on, at this time, the collector voltage of the triode is the collector internal resistance rce × collector current of the triode, because the resistance is extremely small, the collector voltage of the triode is a low level, the triode is connected with the load in parallel, the output of the amplifying and filtering circuit 6 is a low level, the luminance control end DIM of the U2 receives the low level, the chip U2 stops working, enters a standby state, and the lamp is turned off.
When the chip U4 is abnormally contacted or pulled out, the passive RC filter circuit formed by the resistor R36, the resistor R37, the resistor R38, the capacitor C14 and the capacitor C15 in the amplifying filter circuit 6 filters out the high frequency part in the electrostatic energy spectrum, weakens the huge energy generated by the static electricity, and plays a role in protecting the electrostatic isolation.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A microwave induction constant-voltage constant-current LED drive circuit is characterized by comprising a DC/DC voltage reduction constant-current control circuit, a microwave induction module and an amplification filter circuit;
the microwave induction module comprises a pluggable chip U4;
the amplifying and filtering circuit comprises a resistor R38, a capacitor C15, a triode Q2 and a triode Q3;
an output end VO of the chip U4 is electrically connected with a base electrode of a triode Q2, a collector electrode of the triode Q2 is electrically connected with a base electrode of the triode Q3, a collector electrode of the triode Q3 is electrically connected with one end of a resistor R38, the other end of the resistor R38 is electrically connected with one end of a capacitor C15 and the DC/DC step-down constant current control circuit respectively, and the other end of the capacitor C15, an emitter electrode of the triode Q2 and an emitter electrode of the triode Q3 are all grounded.
2. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 1, wherein the amplifying and filtering circuit further comprises a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a capacitor C14;
an output end VO of the chip U4 is electrically connected with one end of a resistor R32, the other end of the resistor R32 is respectively and electrically connected with a base electrode of a triode Q2 and one end of a resistor R33, the other end of the resistor R33 is electrically connected with one end of the resistor R34 and one end of the resistor R35 respectively, the other end of the resistor R34 is respectively and electrically connected with the collector of the triode Q2 and the base of the triode Q3, the other end of the resistor R35 is respectively and electrically connected with the collector of the triode Q3 and one end of the resistor R36, the other end of the resistor R36 is respectively and electrically connected with one end of a resistor R37, one end of a capacitor C14 and one end of a resistor R38, the other end of the resistor R38 is respectively and electrically connected with one end of the capacitor C15 and the DC/DC voltage-reducing constant-current control circuit, the emitter of the triode Q2, the emitter of the triode Q3, the other end of the resistor R37, the other end of the capacitor C14 and the other end of the capacitor C15 are all grounded.
3. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 1, wherein the DC/DC step-down constant-current circuit comprises a chip U2, a resistor R20 and a capacitor C9;
one end of the resistor R20 is electrically connected with a voltage input end VIN of the chip U2, the other end of the resistor R20 is electrically connected with one end of the capacitor C9 and a timing capacitor access end CT of the chip U2 respectively, and the other end of the capacitor C9 is grounded.
4. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 3, wherein the DC/DC step-down constant-current circuit further comprises a freewheeling diode D5, a capacitor C10 and a resistor R21;
the negative electrode of the freewheeling diode D5 is respectively and electrically connected with one end of a resistor R21 and a voltage input end VIN of a chip U2, the other end of the resistor R21 is electrically connected with one end of a capacitor C10, and the other end of the capacitor C10 is respectively and electrically connected with the positive electrode of the freewheeling diode D5 and a drain terminal SW of a built-in MOS transistor of the chip U2.
5. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 3, wherein the DC/DC step-down constant-current circuit further comprises an inductor L4, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a polar capacitor CE3 and a capacitor C11;
one end of the inductor L4 is electrically connected to a drain SW of a built-in MOS transistor of the chip U2, the other end of the inductor L4 is electrically connected to one end of a resistor R22, one end of a resistor R24, one end of a resistor R25, and one end of a resistor R26, the other end of the resistor R22 is electrically connected to a reverse current detection terminal CSN of the chip U2, one end of a resistor R23 is electrically connected to a forward current detection terminal CSP of the chip U2, the other end of the resistor R23 is electrically connected to the other end of the resistor R24, the other end of the resistor R25, the other end of the resistor R26, one end of a capacitor C11, the negative electrode of a polar capacitor CE3, and one end of an LED lamp, the positive electrode of the polar capacitor CE3 is electrically connected to the other end of a capacitor C11 and the other end of the LED lamp, and a luminance control terminal DIM of the chip U2 is electrically connected to one end of a capacitor C15 and the other end of the resistor R38.
6. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 1, further comprising a microwave module supply circuit;
the microwave module supply circuit comprises a chip U3, a resistor R28, a resistor R29, a resistor R30, a resistor R31, an inductor L5, a capacitor C13, a polar capacitor CE4 and a polar capacitor CE 5;
the voltage input end VIN of the chip U3 is electrically connected to one end of a resistor R28 and the positive electrode of a polar capacitor CE5, the other end of the resistor R28 is electrically connected to the enable end EN of the chip U2 and one end of a resistor R29, the output voltage feedback end FB of the chip U3 is electrically connected to one end of a capacitor C13, one end of a resistor R30 and one end of a resistor R31, the other end of the resistor R30 is electrically connected to the 12V voltage input end of the chip U4, one end of an inductor L5 and the positive electrode of a polar capacitor CE4, the other end of the inductor L5 is electrically connected to a built-in MOS transistor SW of the chip U3, and the negative electrode of the polar capacitor CE4, the negative electrode of the polar capacitor CE5, the other end of the resistor R29, the other end of the capacitor C13 and the other end of the resistor R31 are all grounded.
7. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 6, further comprising a flyback circuit;
the flyback circuit is electrically connected with the microwave module supply circuit and the DC/DC voltage reduction constant current circuit respectively.
8. The microwave-induced constant-voltage constant-current LED driving circuit as claimed in claim 7, further comprising an EMC rectifying and filtering circuit;
the EMC rectifying and filtering circuit is electrically connected with the flyback circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104601.1A CN114286472A (en) | 2022-01-28 | 2022-01-28 | Microwave induction constant voltage and constant current LED drive circuit |
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|---|---|---|---|
| CN202210104601.1A CN114286472A (en) | 2022-01-28 | 2022-01-28 | Microwave induction constant voltage and constant current LED drive circuit |
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| CN114286472A true CN114286472A (en) | 2022-04-05 |
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| CN202210104601.1A Pending CN114286472A (en) | 2022-01-28 | 2022-01-28 | Microwave induction constant voltage and constant current LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017066A1 (en) * | 2022-07-19 | 2024-01-25 | 佛山市威得士智能照明科技有限公司 | Led modular intelligent driving circuit |
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2022
- 2022-01-28 CN CN202210104601.1A patent/CN114286472A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017066A1 (en) * | 2022-07-19 | 2024-01-25 | 佛山市威得士智能照明科技有限公司 | Led modular intelligent driving circuit |
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