CN216852438U - Microwave induction constant voltage and constant current LED drive circuit - Google Patents

Microwave induction constant voltage and constant current LED drive circuit Download PDF

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Publication number
CN216852438U
CN216852438U CN202220235725.9U CN202220235725U CN216852438U CN 216852438 U CN216852438 U CN 216852438U CN 202220235725 U CN202220235725 U CN 202220235725U CN 216852438 U CN216852438 U CN 216852438U
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resistor
capacitor
electrically connected
chip
constant
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卢凯
郑榕龙
黄建宏
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XIAMEN YADE ELECTRONIC TECHNOLOGY CO LTD
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XIAMEN YADE ELECTRONIC TECHNOLOGY CO LTD
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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 utility model relates to a microwave response technical field especially relates to a microwave response constant voltage constant current LED drive circuit, including DC/DC step-down constant current control circuit, microwave response module and enlarged filter circuit, the microwave response module is including pulling out the chip U4 of inserting, when the circuit is in operating condition, if chip U4 is extracted or the connection of chip U4 pin appears unusually, in the twinkling of an eye of pin connection disconnection, static will produce huge energy, at this moment, the energy of the corresponding frequency band in the spectrum of enlarged filter circuit filtering electrostatic energy plays the guard action of electrostatic isolation.

Description

Microwave induction constant voltage and constant current LED drive circuit
Technical Field
The utility model relates to a microwave response technical field especially relates to a microwave response constant voltage constant current LED drive 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.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: 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 problem, the utility model discloses a technical scheme be:
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;
the output end VO of the chip U4 is electrically connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is electrically connected with the base electrode of a triode Q3, the collector electrode of the triode Q3 is electrically connected with one end of a resistor R38, the other end of the resistor R38 is respectively electrically connected with one end of a capacitor C15 and a DC/DC step-down constant current circuit, and the other end of the capacitor C15, the emitter electrode of the triode Q2 and the 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 respectively and electrically connected with one end of the resistor R34 and one end of the resistor R35, the other end of the resistor R34 is respectively 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 the resistor R37, one end of the capacitor C14 and one end of the 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, 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 the 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 the 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 with a drain terminal SW of a built-in MOS transistor of the chip U2, the other end of the inductor L4 is electrically connected with 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 respectively, the other end of the resistor R22 is electrically connected with a reverse current detection terminal CSN of the chip U2, one end of a resistor R23 is electrically connected with a forward current detection terminal CSP of the chip U2, the other end of the resistor R23 is electrically connected with 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, a negative electrode of a polarity capacitor CE3 and one end of an LED lamp respectively, a positive electrode of the polarity capacitor CE3 is electrically connected with the other end of the capacitor C11 and the other end of the LED lamp respectively, and a luminance control terminal DIM of the chip U2 is electrically connected with one end of a capacitor C15 and the other end of the resistor R38 respectively.
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 the 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 CE drain end 4, 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 beneficial effects of the utility model reside in that:
the utility model provides a pair of microwave response constant voltage constant current LED drive circuit, including DC/DC step-down constant current control circuit, microwave response module and amplification filter circuit, the microwave response module is including pulling out the chip U4 of inserting, when the circuit is in operating condition, if chip U4 is extracted or the connection of chip U4 pin appears unusually, in the twinkling of an eye of pin hookup disconnection, static will produce huge energy, and at this moment, the energy of the corresponding frequency band in the spectrum of amplification filter circuit filtering electrostatic energy plays electrostatic isolation's guard action.
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 the technical content, the objects and the 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, the present invention provides a microwave-induced constant-voltage and constant-current LED driving circuit, which includes a DC/DC voltage-reduction constant-current control circuit, a microwave-induced module and an amplifying 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 a 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 respectively electrically connected with one end of a capacitor C15 and the DC/DC step-down constant current circuit, 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 utility model provides a pair of microwave response constant voltage constant current LED drive circuit, including DC/DC step-down constant current control circuit, microwave response module and amplification filter circuit, the microwave response module is including pulling out the chip U4 of inserting, when the circuit is in operating condition, if chip U4 is extracted or the connection of chip U4 pin appears unusually, in the twinkling of an eye of pin hookup disconnection, static will produce huge energy, and at this moment, the energy of the corresponding frequency band in the spectrum of amplification filter circuit filtering electrostatic energy plays electrostatic isolation's guard action.
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 respectively and electrically connected with one end of the resistor R34 and one end of the resistor R35, 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 the resistor R37, one end of the capacitor C14 and one end of the 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 the triode Q2 and play a role in limiting current, the resistor R34 is used as a collector resistor of the triode Q2, the current is limited, the static working point of the triode Q2 is stabilized, distortion is avoided, the resistor R35 is used as a collector resistor of the triode Q3, the effect is the same as that of the resistor R34, the resistor R36, the resistor R37, the resistor R38, the capacitor C14 and the capacitor C15 jointly form a passive RC filter circuit, a high-frequency part in an electrostatic energy frequency spectrum is filtered, and the protection effect of electrostatic isolation is played.
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, 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 voltage 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 the 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 the 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, avoid sudden load current change, and make the current change more gradually, so as 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 terminal 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 the 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 amplification filter 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 by the resistor R22, the resistor R23, the resistor R24, the resistor R25, and the resistor R26, the energy conversion between circuits is realized by 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 the 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 CE drain end 4, 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 to provide a high voltage to the enable terminal EN of the chip U3, so that the chip U3 operates, the inductor L5 realizes energy conversion, the resistor R30 and the resistor R31 serve as feedback voltage dividing resistors to provide a feedback voltage to the output voltage feedback terminal FB of the chip U3 for controlling the output voltage, and the capacitor C13 serves as a filter capacitor of the output voltage feedback terminal FB of the chip U3 for filtering out 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 utility model provides a microwave induction constant voltage and constant current LED drive circuit, which comprises an EMC 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 respectively and electrically connected with one end of the resistor R34 and one end of the resistor R35, the other end of the resistor R34 is respectively 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 the resistor R37, one end of the capacitor C14 and one end of the 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 turned off, the amplifying and filtering circuit 6 outputs a high level signal, the lamp is on, after a certain time, the microwave sensing 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 the triode Q2 and play a role in limiting current, the resistor R34 is used as a collector resistor of the triode Q1, the current is limited, the static working point of the triode Q1 is stabilized, distortion is avoided, the resistor R35 is used as a collector resistor of the triode Q3, the effect is the same as that of the resistor R34, the resistor R36, the resistor R37, the resistor R38, the capacitor C14 and the capacitor C15 jointly form a passive RC filter circuit, a high-frequency part in an electrostatic energy frequency spectrum is filtered, and the protection effect of electrostatic isolation is played.
In this 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 a 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 device 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 the 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 the 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 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 the 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 a resistor R24, the other end of a resistor R25, the other end of a resistor R26, one end of a capacitor C11, a negative electrode of a polarity capacitor CE3, and one end of an LED lamp, a positive electrode of the polarity 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 a resistor R38, respectively;
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 energy conversion among circuits is realized through an inductor L4, and a polar capacitor CE3 and a capacitor C11 play a filtering role to reduce the ripple of the output current.
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 the 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 the polar capacitor CE drain end 4, 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 polarity capacitor CE5 is externally connected to a chip U3 for supplying power, the resistor R28 and the resistor R29 are used as voltage dividing resistors to provide a high voltage for an enabling end EN of the chip U3, so that the chip U3 works, the inductor L5 realizes energy conversion, the resistor R30 and the resistor R31 are used as feedback voltage dividing resistors to provide a feedback voltage for an output voltage feedback end FB of the chip U3 to control the output voltage, and the capacitor C13 is used 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 voltage-dividing 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 voltage-dividing resistor network has an overvoltage protection function; 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; a resistor R9, a resistor R10, a resistor R11, a capacitor C6 and a diode D2 form an RCD absorption circuit, and peak voltage generated by leakage inductance of a 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 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 utility model provides a pair of microwave response constant voltage constant current LED drive circuit's principle does:
microwave induction module 5: when a wave with a certain frequency hits an obstacle, a part of the wave is reflected back, 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 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 are used for setting and adjusting the output current of the chip U2, the inductor L4 is used for converting energy among circuits, the polar capacitor CE3 and the capacitor C11 play a role in filtering, and output current ripples are 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 induction module 5 detects that a person passes through, the chip U4 outputs a high level signal, the triode Q2 is switched on, the triode Q3 is switched off, at the moment, the Q3 is equivalent to open circuit, the voltage of the output end is provided by the 12V external power supply and the partial voltage of other resistors, the output of the amplification filter 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 in abnormal contact or is 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 a high-frequency part in an electrostatic energy spectrum, weakens huge energy generated by static electricity, and plays a role in electrostatic isolation protection.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection 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 a 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 the triode Q2 and one end of the resistor R33, the other end of the resistor R33 is respectively and electrically connected with one end of the resistor R34 and one end of the resistor R35, 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 the resistor R37, one end of the capacitor C14 and one end of the 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 control 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, 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 control 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 the 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 the 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 control 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 the 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 a resistor R24, the other end of a resistor R25, the other end of a resistor R26, one end of a capacitor C11, a negative electrode of a polarity capacitor CE3, and one end of an LED lamp, a positive electrode of the polarity 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 a 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 the 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 CE drain end 4, 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 respectively electrically connected with the microwave module supply circuit and the DC/DC voltage-reduction constant-current control circuit.
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.
CN202220235725.9U 2022-01-28 2022-01-28 Microwave induction constant voltage and constant current LED drive circuit Active CN216852438U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220235725.9U CN216852438U (en) 2022-01-28 2022-01-28 Microwave induction constant voltage and constant current LED drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220235725.9U CN216852438U (en) 2022-01-28 2022-01-28 Microwave induction constant voltage and constant current LED drive circuit

Publications (1)

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CN216852438U true CN216852438U (en) 2022-06-28

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