CN211184340U - L ED power supply circuit and induction device - Google Patents
L ED power supply circuit and induction device Download PDFInfo
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- CN211184340U CN211184340U CN201921260123.3U CN201921260123U CN211184340U CN 211184340 U CN211184340 U CN 211184340U CN 201921260123 U CN201921260123 U CN 201921260123U CN 211184340 U CN211184340 U CN 211184340U
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- 230000006698 induction Effects 0.000 title abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 135
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- 238000005286 illumination Methods 0.000 abstract description 4
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Abstract
The utility model discloses an L ED power supply circuit and induction system, be used for controlling L ED lamp, L ED power supply circuit includes supply circuit, photosensitive detection circuit and opto-coupler isolation circuit, wherein, supply circuit provides working power supply for photosensitive detection circuit and L ED lamp, photosensitive detection circuit detects whether the current value of photosensitive detection circuit reaches the default in the predetermined scope, when photosensitive detection circuit's current value is greater than or equal to the default, export first level signal, when photosensitive detection circuit's current value is less than the default, export second level signal, opto-coupler isolation circuit passes through the mode output of opto-coupler with first level signal or second level signal, supply circuit is when receiving first level signal, export first voltage control L ED lamp and light, when receiving second level signal, export second voltage control L ED lamp and light, with the technical problem that induction plug power supply is not in detection range L ED unable illumination in order to solve prior art.
Description
Technical Field
The utility model relates to a power module technical field, in particular to L ED power supply circuit and induction system.
Background
The sensing plug power supply is a device or a circuit for adjusting the size of an output power supply according to infrared sensing and radar detection, the circuit is mainly used for indoor occasions such as corridors, corresponding L ED is lightened when data detected by the infrared sensing and the radar change, and the power supply is not output when the infrared sensing and the radar do not change.
In the prior art, the detection distance is limited, so that a pedestrian cannot be detected to pass through, at the moment, voltage data detected by the induction plug power supply is not changed, so that the power supply is not output, L ED is in an off state, and illumination cannot be performed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an L ED power supply circuit aims at solving the problem that the unable illumination of sensing end cap power in prior art L ED was not in detection range at the pedestrian.
In order to achieve the above object, the utility model provides an L ED power supply circuit for control L ED lamp, L ED power supply circuit includes supply circuit, photosensitive detection circuit and opto-coupler isolation circuit, supply circuit includes forward input, reverse input, controlled end, forward output, reverse output, photosensitive detection power output and opto-coupler isolation signal output, opto-coupler isolation circuit includes input, first output and second output, supply circuit's forward input is connected with alternating current forward input, supply circuit's reverse input is connected with alternating current reverse input, supply circuit's controlled end is connected with the first output of opto-coupler isolation circuit, supply circuit's forward output with the forward power input of L ED lamp is connected, supply circuit's reverse output with the reverse power input of L ED lamp is connected, supply circuit's photosensitive detection power output is connected with photosensitive detection circuit's input/output, supply circuit's photosensitive detection signal output is connected with the input of opto-coupler isolation circuit's input;
the power supply circuit is used for providing working power supply for the photosensitive detection circuit and the L ED lamp;
the photosensitive detection circuit is used for detecting whether the current value of the photosensitive detection circuit in a preset range reaches a preset value, outputting a first level signal when the current value of the photosensitive detection circuit is larger than or equal to the preset value, and outputting a second level signal when the current value of the photosensitive detection circuit is smaller than the preset value;
the optical coupler isolation circuit is used for outputting the first level signal or the second level signal in an optical coupler mode so as to isolate the photosensitive detection circuit from the power supply circuit;
the power supply circuit is used for outputting a first voltage to control the L ED lamp to be turned on when receiving a first level signal, and outputting a second voltage to control the L ED lamp to be turned on when receiving a second level signal, wherein the voltage of the first voltage signal and the voltage of the second voltage signal are both greater than zero, and the voltage of the second voltage signal is less than the voltage of the first voltage level signal.
Optionally, the photosensitive detection circuit includes a first resistor, a first end of the first resistor is an input/output end of the photosensitive detection circuit, and a second end of the first resistor is an output end of the photosensitive detection circuit.
Optionally, the optical coupler isolation circuit includes an optical coupler device, a first end of the optical coupler device is an input end of the optical coupler isolation circuit, a second end of the optical coupler device is a second output end of the optical coupler isolation circuit, a third end of the optical coupler device is a first output end of the optical coupler isolation circuit, and a fourth end of the optical coupler device is grounded.
Optionally, the power supply circuit comprises a rectifying and filtering circuit, a voltage conversion circuit and a photosensitive detection power supply circuit, the rectification filter circuit comprises a forward current input end, a reverse current input end, a forward current output end and a reverse current output end, the voltage conversion circuit comprises an input end, a control signal input end, a forward current output end, a reverse current output end and a photosensitive detection power supply output end, the photosensitive detection power supply circuit comprises an input end, a photosensitive detection power supply output end and a detection signal output end, the forward current input end of the rectifying and filtering circuit is the forward input end of the power supply circuit, the reverse current input end of the rectifying and filtering circuit is the reverse input end of the power supply circuit, the forward current output end of the rectification filter circuit is connected with the input end of the voltage conversion circuit, the reverse current output end of the rectification filter circuit is the forward output end of the power supply circuit; the control signal input end of the voltage conversion circuit is a controlled end of the power supply circuit, the forward current output end of the voltage conversion circuit is a forward output end of the power supply circuit, the reverse current output end of the voltage conversion circuit is a reverse output end of the power supply circuit, and the photosensitive detection power supply output end of the voltage conversion circuit is connected with the input end of the photosensitive detection power supply circuit; the photosensitive detection power supply output end of the photosensitive detection power supply circuit is the photosensitive detection power supply output end of the power supply circuit, and the detection signal output end of the photosensitive detection power supply circuit is the optical coupling isolation signal output end of the power supply circuit;
the rectification filter circuit is used for carrying out rectification filtering processing on the voltages input by the alternating current positive input end and the alternating current reverse input end;
when receiving a second level signal, the voltage conversion circuit outputs a second voltage through the forward power input end of the L ED lamp and the reverse power input end of the L ED lamp, controls the L ED lamp to be turned on, and outputs a fourth voltage through the photosensitive detection electric output end of the voltage conversion circuit;
and the photosensitive detection power supply circuit is used for rectifying and stabilizing the third voltage or the fourth voltage and providing working voltage for the photosensitive detection circuit.
Optionally, the photosensitive detection power supply circuit includes a first diode, a second diode, a third diode, a second resistor, a third resistor, a fourth resistor, a first capacitor, and a first triode, an anode of the first diode is an input terminal of the photosensitive detection power supply circuit, and a cathode of the first diode is connected to a first terminal of the second resistor; the second end of the second resistor, the first end of the first capacitor, the first end of the third resistor and the collector of the first triode are interconnected; the base electrode of the first triode, the second end of the third resistor and the cathode of the second diode are interconnected, the emitting electrode of the first triode is connected with the first end of the fourth resistor, and the connection node of the first triode and the fourth resistor is the photosensitive detection power output end of the photosensitive detection power circuit; the second end of the first capacitor, the anode of the second diode and the anode of the third diode are interconnected; the cathode of the third diode is connected with the second end of the fourth resistor, and the connection node of the third diode and the fourth resistor is the detection signal output end of the photosensitive detection power supply circuit.
Optionally, the voltage converting circuit includes a BUCK circuit, a voltage stabilizing circuit, a voltage reducing circuit and a switch circuit, the BUCK circuit includes an input terminal, a switching power supply output terminal, a forward output terminal and a reverse output terminal, the switch circuit includes an input terminal, an output terminal and a controlled terminal, the voltage reducing circuit includes an input terminal, a first output terminal and a second output terminal,
the input end of the BUCK circuit is connected with the output end of the voltage stabilizing circuit, the connection node of the BUCK circuit and the voltage stabilizing circuit is the input end of the voltage conversion circuit, the output end of a switching power supply of the BUCK circuit is connected with the input end of the switching circuit, the forward output end of the BUCK circuit is connected with the first output end of the voltage reduction circuit, the connection node of the BUCK circuit and the voltage reduction circuit is the forward current output end of the voltage conversion circuit, and the reverse output end of the BUCK circuit is the reverse current output end of the voltage conversion circuit; the controlled end of the switch circuit is connected with the input end of the voltage stabilizing circuit, and the connection node of the switch circuit and the voltage stabilizing circuit is the control signal input end of the voltage conversion circuit; the input end of the voltage reduction circuit is connected with the output end of the switch circuit, and the second output end of the voltage reduction circuit is the photosensitive detection power supply output end of the voltage conversion circuit;
the BUCK circuit is used for carrying out voltage reduction processing on power signals input to the positive input end and the negative input end of the alternating current;
the voltage stabilizing circuit is used for stabilizing a control signal received by a controlled end of the switch circuit;
the switch circuit is used for outputting the first voltage or the second voltage to conduct a corresponding path according to the control signal so as to light L ED lamps;
the voltage reduction circuit is used for reducing the voltage output by the output end of the switch circuit so as to output the third voltage or the fourth voltage.
Optionally, the switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor, and a first MOS transistor, a first end of the fifth resistor, a first end of the sixth resistor, and a first end of the seventh resistor are interconnected, a connection node of the fifth resistor and the seventh resistor is an input end of the switch circuit, and a second end of the fifth resistor, a second end of the sixth resistor, and a drain of the first MOS transistor are interconnected; the source electrode of the first MOS tube is connected with the second end of the seventh resistor, the connection node of the first MOS tube and the seventh resistor is the output end of the switch circuit, and the grid electrode of the first MOS tube is the controlled end of the switch circuit.
Optionally, the step-down circuit includes a first transformer, a first end of the first transformer is an input end of the step-down circuit, a second end of the first transformer is a first output end of the step-down circuit, a third end of the first transformer is a second output end of the step-down circuit, and a fourth end of the first transformer is grounded.
Optionally, the voltage stabilizing circuit includes a second capacitor, a fourth diode, and an eighth resistor, a first end of the second capacitor, a cathode of the fourth diode, and a first end of the eighth resistor are interconnected, a connection node of the second capacitor and the eighth resistor is an input end of the voltage stabilizing circuit, and a second end of the second capacitor is connected to an anode of the fourth diode; and the first end of the eighth resistor is the output end of the voltage stabilizing circuit.
Optionally, the BUCK circuit includes a first chip, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth diode, and a sixth diode, the first chip includes a control signal input pin, an operating power pin, a feedback pin, a power signal input pin, a power signal output pin, a ground pin, and a compensation pin, the control signal input pin of the first chip and the power signal input pin of the first chip are connected to a first end of the ninth resistor, a connection node between the first chip and the ninth resistor is an input end of the BUCK circuit, the operating power pin of the first chip, the first end of the twelfth resistor, the first end of the fourth capacitor, and a cathode of the fifth diode are interconnected, a feedback pin of the first chip, a first end of the third capacitor, a first end of the tenth resistor and a first end of the eleventh resistor are interconnected, a ground terminal of the first chip, a second end of the fourth capacitor, a second end of the fifth capacitor, a second end of the third capacitor and a second end of the tenth resistor are all grounded, a compensation pin of the first chip is connected with the first end of the fifth capacitor, a power signal output pin of the first chip is connected with a cathode of the sixth diode, and a connection node of the first chip and the sixth diode is a switching power supply output end of the BUCK circuit; the second end of the ninth resistor is connected with the second end of the twelfth resistor; a second end of the eleventh resistor is connected with a first end of the fifteenth resistor; an anode of the fifth diode is connected with a first end of the thirteenth resistor, and a second end of the thirteenth resistor is connected with a first end of the fourteenth resistor; a second end of the fourteenth resistor, a second end of the fifteenth resistor, a first end of the sixth capacitor and a first end of the fifteenth resistor are interconnected, and a connection node of the fourteenth resistor and the fifteenth resistor is a forward output end of the BUCK circuit; and a second end of the sixth capacitor, a second end of the fifteenth resistor and an anode of the sixth diode are interconnected, and a connection node of the sixth capacitor and the sixth diode is an inverted output end of the BUCK circuit.
To achieve the above object, the present invention further provides an induction device, which includes the L ED power circuit as described above.
The utility model discloses a setting up power supply circuit at L ED power supply circuit, photosensitive detection circuit and opto-coupler isolation circuit, power supply circuit includes the forward input end, reverse input end, the controlled end, forward output end, reverse output end, photosensitive detection power output end and opto-coupler isolation signal output end, opto-coupler isolation circuit includes the input, first output and second output, power supply circuit's forward input end is connected with the forward input end of alternating current, power supply circuit's reverse input end is connected with the reverse input end of alternating current, power supply circuit's controlled end is connected with opto-coupler isolation circuit's first output end, power supply circuit's forward output end is connected with L ED lamp's forward power input end, power supply circuit's reverse output end is connected with L ED lamp's reverse power input end, power supply circuit's photosensitive detection power output end is connected with photosensitive detection circuit's input/output end, power output end is connected with opto-coupler isolation circuit's input end, optical-coupler isolation signal output end is connected with photosensitive detection circuit's output end, power supply circuit's second output end is connected with photosensitive detection circuit's output end when photosensitive detection circuit's voltage detects photosensitive detection circuit and photosensitive detection circuit's voltage output voltage and photosensitive detection circuit's normal light level, photosensitive detection circuit detects the light output voltage, photosensitive detection circuit's voltage when the light voltage is greater than the light voltage, photosensitive detection voltage threshold value, photosensitive detection circuit detects the light output voltage threshold value, the light output signal threshold value, the light output voltage threshold value, the light output signal threshold value, the light threshold value is greater than when the light threshold value, the light threshold value of light threshold value, the light threshold value is greater than the light threshold value, the light threshold value of light threshold value, the light threshold value of light detection circuit is greater than the light threshold value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of an L ED power circuit of the present invention;
fig. 2 is a schematic circuit diagram of an L ED power circuit according to the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an L ED power supply circuit for solve the response end cap power and not be in the technical problem that L ED can't throw light on in the detection range at the pedestrian.
In order to solve the problem that an induction plug power supply cannot illuminate L ED when a pedestrian is not in a detection range, in an embodiment, as shown in fig. 1, a L ED power supply circuit comprises a power supply circuit 11, a photosensitive detection circuit 13 and an optical coupling isolation circuit 12, the power supply circuit 11 comprises a forward input end, a reverse input end, a controlled end, a forward output end, a reverse output end, a photosensitive detection power output end and an optical coupling isolation signal output end, the optical coupling isolation circuit 12 comprises an input end, a first output end and a second output end, the forward input end of the power supply circuit 11 is connected with an AC forward input end AC-L, the reverse input end of the power supply circuit 11 is connected with an AC reverse input end AC-N, the controlled end of the power supply circuit 11 is connected with the first output end of the optical coupling isolation circuit 12, the forward output end of the power supply circuit 11 is connected with a forward power input end L ED + of a L ED lamp, the reverse output end of the power supply circuit 11 is connected with a reverse power input end L ED-of a L ED lamp, the photosensitive detection power output end of the photosensitive detection circuit 11 is connected with an input/output end of the photosensitive detection circuit 13, the optical coupling isolation circuit 11 is.
The power supply circuit 11 provides a working power supply for the photosensitive detection circuit 13 and the L ED lamp, the photosensitive detection circuit 13 detects whether the current value of the photosensitive detection circuit 13 in a preset range reaches a preset value, the preset value is determined by parameters of the photosensitive detection circuit 13 in a specific circuit and is not limited, in addition, the current value of the photosensitive detection circuit 13 when no person passes through can be used as the preset value, when the current value of the photosensitive detection circuit 13 is larger than or equal to the preset value, a first level signal is output, when the current value of the photosensitive detection circuit 13 is smaller than the preset value, a second level signal is output, the optical coupling isolation circuit 12 is used for outputting the first level signal or the second level signal in an optical coupling mode, so as to isolate the photosensitive detection circuit 13 from the power supply circuit 11, the influence of overlarge current change of the photosensitive detection circuit 13 on normal operation of the power supply circuit 11 can be avoided, when the power supply circuit 11 receives the first level signal, the first voltage control L ED lamp is output to be turned on, when the second level signal is received, the second voltage control L to turn on the light, when the first level signal and the light voltage is smaller than the light voltage of the light voltage, the light-saving signal, the light-induced by the light-induced lighting circuit 13, the light-induced lighting problem that the light-induced lighting safety problem that the light-induced lighting voltage is not detected in a certain energy-saving condition that the light-induced light.
In order to save cost and simplify the photosensitive detection circuit 13, in an embodiment, the photosensitive detection circuit 13 (not shown in fig. 2, connected to the CON interface) includes a first resistor R1 (not shown), a first end of the first resistor R1 is an input/output end 1 of the photosensitive detection circuit 13, and a second end of the first resistor R1 is an output end 2 of the photosensitive detection circuit 13.
Optionally, the optical coupler isolation circuit 12 includes an optical coupler device U2, the first end of the optical coupler device U2 is the input end of the optical coupler isolation circuit 12, the second end of the optical coupler device U2 is the second output end of the optical coupler isolation circuit 12, the third end of the optical coupler device U2 is the first output end of the optical coupler isolation circuit 12, and the fourth end of the optical coupler device U2 is grounded.
Wherein, the inside emitting diode and the light sense triode that contain of opto-coupler device U2, emitting diode converts the signal of telecommunication into light signal, and the light sense triode converts light signal into the signal of telecommunication, has realized the purpose that will detect photosensitive detection circuitry 13's first level signal or second level signal transmission to power supply circuit 11's controlled end, and in addition, opto-coupler device U2 keeps apart power supply circuit 11 and photosensitive detection circuitry 13, can avoid influencing power supply circuit 11's the condition because the too big electric current that detects.
Alternatively, the power supply circuit 11 includes a rectifying and filtering circuit 111, a voltage converting circuit 112 and a photosensitive detection power supply circuit 113, the rectifying and filtering circuit 111 includes a forward current input terminal, a reverse current input terminal, a forward current output terminal and a reverse current output terminal, the voltage converting circuit 112 includes an input terminal, the photosensitive detection power supply circuit 113 comprises an input end, a photosensitive detection power supply output end and a detection signal output end, the forward current input end of the rectifying and filtering circuit 111 is the forward input end of the power supply circuit 11, the reverse current input end of the rectifying and filtering circuit 111 is the reverse input end of the power supply circuit 11, the forward current output end of the rectifying and filtering circuit 111 is connected with the input end of the voltage transformation circuit 112, and the reverse current output end of the rectifying and filtering circuit 111 is the forward output end of the power supply circuit 11; the control signal input end of the voltage conversion circuit 112 is the controlled end of the power supply circuit 11, the forward current output end of the voltage conversion circuit 112 is the forward output end of the power supply circuit 11, the reverse current output end of the voltage conversion circuit 112 is the reverse output end of the power supply circuit 11, and the photosensitive detection power supply output end of the voltage conversion circuit 112 is connected with the input end of the photosensitive detection power supply circuit 113. The photosensitive detection power output end of the photosensitive detection power circuit 113 is the photosensitive detection power output end of the power supply circuit 11, and the detection signal output end of the photosensitive detection power circuit 113 is the optical coupling isolation signal output end of the power supply circuit 11.
The rectifying and filtering circuit 111 rectifies and filters voltages input by an alternating current forward input end AC-L and an alternating current reverse input end AC-N, the voltage conversion circuit 112 outputs a first voltage through a forward power input end of a L ED lamp and a reverse power input end of a L ED lamp when receiving a first level signal, the L ED lamp is controlled to be turned on, a third voltage is output through a photosensitive detection electric output end of the voltage conversion circuit 112 to supply working power to the photosensitive detection power circuit 113, a second voltage is output through the forward power input end of the L ED lamp and the reverse power input end of the L ED lamp when receiving a second level signal, the L ED lamp is controlled to be turned on, and a fourth voltage is output through a photosensitive detection electric output end of the voltage conversion circuit 112, and the photosensitive detection power circuit 113 rectifies and stabilizes the third voltage or the fourth voltage to provide the working voltage for the photosensitive detection circuit 13.
Optionally, as shown in fig. 2, the light-sensitive detection power circuit 113 includes a first diode D1, a second diode D2, a third diode D3, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, and a first transistor Q1, an anode of the first diode D1 is an input terminal of the light-sensitive detection power circuit 113, and a cathode of the first diode D1 is connected to a first terminal of the second resistor R2. The second terminal of the second resistor R2, the first terminal of the first capacitor C1, the first terminal of the third resistor R3, and the collector of the first transistor Q1 are interconnected. The base of the first triode Q1, the second end of the third resistor R3 and the cathode of the second diode D2 are interconnected, the emitter of the first triode Q1 is connected with the first end of the fourth resistor R4, and the connection node of the first triode Q1 and the fourth resistor R4 is the photosensitive detection power output end of the photosensitive detection power circuit 113. The second end of the first capacitor C1, the anode of the second diode D2, and the anode of the third diode D3 are interconnected, the cathode of the third diode D3 is connected to the second end of the fourth resistor R4, and the connection node between the third diode D3 and the fourth resistor R4 is the detection signal output terminal of the photosensitive detection power supply circuit 113.
After the current is input, the current is rectified and filtered by the second resistor R2 flowing through the first diode D1, and the first capacitor C1 absorbs noise in the current, and then the noise is output to the output end of the photosensitive detection power supply circuit 113 through the first triode Q1. The detected current value is simultaneously output to the detection signal output terminal of the photosensitive detection power supply circuit 113 via the fourth resistor R4. It should be noted that the second diode D2 and the third diode D3 are zener diodes, which can stabilize the output voltage of the power at the output end of the photosensitive detection power supply and the output voltage of the detection signal at the output end of the detection signal.
Alternatively, the voltage conversion circuit 112 includes a BUCK circuit 1122, a voltage stabilizing circuit 1121, a voltage step-down circuit 1124, and a switching circuit 1123, the BUCK circuit 1122 includes an input terminal, a switching power supply output terminal, a forward output end and a reverse output end, the switch circuit 1123 comprises an input end, an output end and a controlled end, the voltage-reducing circuit 1124 comprises an input end, a first output end and a second output end, the input end of the BUCK circuit 1122 is connected with the output end of the voltage stabilizing circuit 1121, the connection node of the BUCK circuit 1122 and the voltage stabilizing circuit 1121 is the input end of the voltage converting circuit 112, the switch power supply output end of the BUCK circuit 1122 is connected with the input end of the switch circuit 1123, the forward output end of the BUCK circuit 1122 is connected with the first output end of the voltage-reducing circuit 1124, the connection node of the BUCK circuit 1122 and the voltage-reducing circuit 1124 is the forward current output end of the voltage converting circuit 112, and the reverse output end of the BUCK circuit 1122 is the reverse current output end of the. The controlled terminal of the switch circuit 1123 is connected to the input terminal of the voltage stabilizing circuit 1121, and the connection node between the switch circuit 1123 and the voltage stabilizing circuit 1121 is the control signal input terminal of the voltage converting circuit 112. The input end of the voltage-reducing circuit 1124 is connected to the output end of the switch circuit 1123, and the second output end of the voltage-reducing circuit 1124 is the photosensitive detection power output end of the voltage converting circuit 112.
The BUCK circuit 1122 steps down power signals input to the AC forward input terminal AC-L and the AC reverse input terminal AC-N, the voltage stabilizing circuit 1121 stabilizes control signals received by the controlled terminal of the switch circuit 1123, the switch circuit 1123 outputs a first level signal or a second level signal according to the control signals to turn on a corresponding path to light the L ED lamp, and the voltage step-down circuit 1124 steps down voltage output by the output terminal of the switch circuit 1123 to output a third level signal or a fourth level signal.
The switch circuit 1123 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a first MOS transistor Q2, a first end of the fifth resistor R5, a first end of the sixth resistor R6, and a first end of the seventh resistor R7 are interconnected, a connection node between the fifth resistor R5 and the seventh resistor R7 is an input terminal of the switch circuit 1123, and a second end of the fifth resistor R5, a second end of the sixth resistor R6, and a drain of the first MOS transistor Q2 are interconnected. The source of the first MOS transistor Q2 is connected to the second end of the seventh resistor R7, the connection node between the first MOS transistor Q2 and the seventh resistor R7 is the output end of the switch circuit 1123, and the gate of the first MOS transistor Q2 is the controlled end of the switch circuit 1123.
When someone passes through the first MOS transistor Q2, the gate voltage is a first level signal, that is, a high level, the first MOS transistor Q2 is turned on, and the current is output to the L ED lamp through the fifth resistor R5 and the sixth resistor R6, and the output voltage is equal to or greater than the rated voltage of L ED at this time, so that the L ED maintains the brightest brightness.
In the above embodiment, in order to achieve a relatively good energy saving effect without affecting the illumination, the voltage is set to a voltage value that can maintain about 30% of the brightness when the L ED lamp is fully on.
Optionally, in order to simplify the voltage dropping circuit 1124 and achieve a better voltage dropping effect, the voltage dropping circuit 1124 includes a first transformer T1, a first end of the first transformer T1 is an input end of the voltage dropping circuit 1124, a second end of the first transformer T1 is a first output end of the voltage dropping circuit 1124, a third end of the first transformer T1 is a second output end of the voltage dropping circuit 1124, and a fourth end of the first transformer T1 is grounded.
In one embodiment, the voltage input to the first terminal of the first transformer T1 is 400V, and the voltage output from the third terminal of the first transformer T1 is 10V, and the voltage is filtered, stabilized and amplified by the photosensitive detection power circuit 113 to provide the operating voltage for the photosensitive detection circuit 13. It should be noted that the reference of 400V before transformation and 10V after transformation in this embodiment is only an illustration data showing the reliability of the implementation of the present application, and is not used to limit the relevant parameters of the transformer and the voltage ranges before and after transformation.
Optionally, in order to ensure that the voltages of the first level signal and the second level signal input to the switch circuit 1123 are stable, the voltage stabilizing circuit 1121 includes a second capacitor C2, a fourth diode D4, and an eighth resistor R8, a first end of the second capacitor C2, a cathode of the fourth diode D4, and a first end of the eighth resistor R8 are interconnected, a connection node of the second capacitor C2 and the eighth resistor R8 is an input end of the voltage stabilizing circuit 1121, and a second end of the second capacitor C2 is connected to an anode of the fourth diode D4. A first terminal of the eighth resistor R8 is an output terminal of the stabilizing circuit 1121.
Optionally, the BUCK circuit 1122 includes a first chip U1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fifth diode D5, and a sixth diode D6, the first chip U1 includes a control signal input pin, an operating power supply pin, a feedback pin, a power supply signal input pin, a power supply signal output pin, a ground pin, and a compensation pin, the control signal input pin of the first chip U1, the power supply signal input pin of the first chip U1 and a first end of the ninth resistor R9 are connected, a connection node of the first chip U1 and the first chip ninth resistor R9 is an input terminal of the BUCK circuit 1122, the operating power supply pin of the first chip U2, a first end of the twelfth resistor R12, a first end of the fourth resistor R8253, a cathode 8653 and a cathode 8653 of the fifth diode D8653 are interconnected, the feedback pin of the first chip U1, the first end of the third capacitor C3, the first end of the tenth resistor R10, and the first end of the eleventh resistor R11 are interconnected, the ground terminal of the first chip U1, the second end of the fourth capacitor C4, the second end of the fifth capacitor C5, the second end of the third capacitor C3, and the second end of the tenth resistor R10 are all grounded, the compensation pin of the first chip U1 is connected to the first end of the fifth capacitor C5, the power signal output pin of the first chip U1 is connected to the cathode of the sixth diode, and the connection node between the first chip U1 and the sixth diode is the switching power supply output terminal of the BUCK circuit 1122. A second terminal of the ninth resistor R9 is connected to a second terminal of the twelfth resistor R12. A second end of the eleventh resistor R11 is connected to a first end of the fifteenth resistor R15. An anode of the fifth diode D5 is connected to a first terminal of the thirteenth resistor R13, and a second terminal of the thirteenth resistor R13 is connected to a first terminal of the fourteenth resistor R14. A second end of the fourteenth resistor R14, a second end of the fifteenth resistor R15, a first end of the sixth capacitor, and a first end of the fifteenth resistor R15 are interconnected, and a connection node of the fourteenth resistor R14 and the fifteenth resistor R15 is a forward output terminal of the BUCK circuit 1122. A second terminal of the sixth capacitor, a second terminal of the fifteenth resistor R15, and an anode of the sixth diode are interconnected, and a connection node of the sixth capacitor and the sixth diode is an inverted output terminal of the BUCK circuit 1122.
The working power supply input through the control signal input pin of the first chip U1 and the power supply signal input pin of the first chip U1 is stepped down under the action of the first chip U1, and then the stepped-down power supply signal is output through the power supply signal output pin of the first chip U1, wherein the feedback pin of the first chip U1 can collect the output voltage of the BUCK circuit 1122, the output signal of the power supply signal output pin of the first chip U1 is fed back and adjusted according to the feedback voltage value at the moment of the first chip U1, and the compensation pin of the first chip U1 is used for stabilizing the output signal of the power supply signal output pin.
Optionally, the rectifying and filtering circuit 111 includes a seventh diode D7, an eighth diode D8, a ninth diode D9, a twelfth diode D10, a seventh capacitor C7, an eighth capacitor C8, and a first inductor L1, which are connected in a specific relationship as shown in the figure, wherein the seventh capacitor C7, the eighth capacitor C8, and the first inductor L1 form a low-pass filter, and achieve a filtering effect.
The principle of the present invention is explained below with reference to fig. 1 and 2:
when the resistance of the first resistor (photo resistor) of the photo sensing circuit 13 is increased, it can be determined that a pedestrian passes through the photo sensing circuit at this moment, the photo sensing circuit 13 outputs a high level to the first MOS transistor Q2 and the first chip U1 through the optical coupler device U2, a path between the fifth resistor R5 and the sixth resistor R6 and the first transformer T1 is turned on, and the first chip U1 outputs a first voltage signal, so that the L ED is in a full bright state.
When the resistance of the first resistor (photo resistor) of the photo sensing circuit 13 is decreased, it can be determined that the person is far away at this moment, the photo sensing circuit 13 outputs a low level to the first MOS transistor Q2 and the first chip U1 through the optical coupler device U2, a path between the fifth resistor R5 and the sixth resistor R6 and the first transformer T1 is disconnected, and the first chip U1 outputs a second voltage signal, so that the L ED is in a bright state.
In the above embodiment, the voltage of the second voltage signal is lower than the level of the first voltage signal, and at this time, the L ED in the slightly bright state has a brightness of L ED in the fully bright state by 30%, so that the problem that a pedestrian cannot be illuminated by L ED when the pedestrian is not in the detection range is solved, and energy is saved compared with the case that the existing street lamp is always in a high brightness.
To achieve the above object, the present invention further provides an induction device, which includes the L ED power circuit.
It should be noted that, because the utility model discloses induction system has contained above-mentioned L ED power supply circuit's whole embodiments, consequently the utility model discloses induction system has all beneficial effects of above-mentioned L ED power supply circuit, and no longer the repeated description here.
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (10)
1. An L ED power supply circuit for controlling a L ED lamp, wherein the L ED power supply circuit comprises a power supply circuit, a photosensitive detection circuit and an optical coupling isolation circuit,
the power supply circuit comprises a forward input end, a reverse input end, a controlled end, a forward output end, a reverse output end, a photosensitive detection power supply output end and an optical coupling isolation signal output end, the optical coupling isolation circuit comprises an input end, a first output end and a second output end, the forward input end of the power supply circuit is connected with the forward input end of alternating current, the reverse input end of the power supply circuit is connected with the reverse input end of the alternating current, the controlled end of the power supply circuit is connected with the first output end of the optical coupling isolation circuit, the forward output end of the power supply circuit is connected with the forward power supply input end of the L ED lamp, the reverse output end of the power supply circuit is connected with the reverse power supply input end of the L ED lamp, the photosensitive detection power supply output end of the power supply circuit is connected with the input/output end of the photosensitive detection circuit, and the optical coupling isolation signal output end of the power supply circuit is connected with the input end of the optical coupling isolation circuit;
the power supply circuit is used for providing working power supply for the photosensitive detection circuit and the L ED lamp;
the photosensitive detection circuit is used for detecting whether the current value of the photosensitive detection circuit in a preset range reaches a preset value, outputting a first level signal when the current value of the photosensitive detection circuit is larger than or equal to the preset value, and outputting a second level signal when the current value of the photosensitive detection circuit is smaller than the preset value;
the optical coupler isolation circuit is used for outputting the first level signal or the second level signal in an optical coupler mode so as to isolate the photosensitive detection circuit from the power supply circuit;
the power supply circuit is used for outputting a first voltage to control the L ED lamp to be turned on when receiving a first level signal, and outputting a second voltage to control the L ED lamp to be turned on when receiving a second level signal, wherein the voltage of the first voltage signal and the voltage of the second voltage signal are both greater than zero, and the voltage of the second voltage signal is less than the voltage of the first voltage level signal.
2. The L ED power supply circuit of claim 1, wherein the light sensitive detection circuit includes a first resistor having a first terminal that is an input/output terminal of the light sensitive detection circuit and a second terminal that is an output terminal of the light sensitive detection circuit.
3. The L ED power supply circuit of claim 1, wherein the optical coupler isolation circuit includes an optical coupler device, a first end of the optical coupler device is an input end of the optical coupler isolation circuit, a second end of the optical coupler device is a second output end of the optical coupler isolation circuit, a third end of the optical coupler device is a first output end of the optical coupler isolation circuit, and a fourth end of the optical coupler device is grounded.
4. The L ED power supply circuit of claim 1, wherein the power supply circuit includes a rectifier filter circuit, a voltage converter circuit and a photosensitive detection power supply circuit, the rectifier filter circuit includes a forward current input, a reverse current input, a forward current output and a reverse current output, the voltage converter circuit includes an input, a control signal input, a forward current output, a reverse current output and a photosensitive detection power supply output, the photosensitive detection power supply circuit includes an input, a photosensitive detection power supply output and a detection signal output, the forward current input of the rectifier filter circuit is the forward input of the power supply circuit, the reverse current input of the rectifier filter circuit is the reverse input of the power supply circuit, the forward current output of the rectifier filter circuit is connected to the input of the voltage converter circuit, the reverse current output of the rectifier filter circuit is the output of the power supply circuit, the control signal input of the voltage converter circuit is the controlled terminal of the power supply circuit, the forward current output of the voltage converter circuit is the forward output of the power supply circuit, the reverse current output of the voltage converter circuit is the reverse current output of the power supply circuit, the control signal input of the voltage converter circuit is the controlled terminal of the photosensitive detection power supply circuit, the photosensitive detection power supply circuit is the photosensitive detection power supply output;
the rectification filter circuit is used for carrying out rectification filtering processing on the voltages input by the alternating current positive input end and the alternating current reverse input end;
when receiving a second level signal, the voltage conversion circuit outputs a second voltage through the forward power input end of the L ED lamp and the reverse power input end of the L ED lamp, controls the L ED lamp to be turned on, and outputs a fourth voltage through the photosensitive detection electric output end of the voltage conversion circuit;
and the photosensitive detection power supply circuit is used for rectifying and stabilizing the third voltage or the fourth voltage and providing working voltage for the photosensitive detection circuit.
5. The L ED power supply circuit of claim 4, wherein the photodetection power supply circuit includes a first diode, a second diode, a third diode, a second resistor, a third resistor, a fourth resistor, a first capacitor and a first triode, an anode of the first diode is an input terminal of the photodetection power supply circuit, a cathode of the first diode is connected to a first terminal of the second resistor, a second terminal of the second resistor, a first terminal of the first capacitor, a first terminal of the third resistor and a collector of the first triode are interconnected, a base of the first triode, a second terminal of the third resistor and a cathode of the second diode are interconnected, an emitter of the first triode is connected to a first terminal of the fourth resistor, a connection node of the first triode and the fourth resistor is a photodetection power supply output terminal of the photodetection power supply circuit, a second terminal of the first capacitor, a cathode of the second diode, an anode of the third diode is interconnected, a cathode of the third diode is connected to a second terminal of the fourth resistor, and a cathode of the third diode is connected to a photodetection power supply output terminal of the photodetection power supply circuit.
6. The L ED power supply circuit of claim 4 wherein the voltage translation circuit includes a BUCK circuit including an input, a switching power supply output, a forward output and a reverse output, a regulation circuit, a BUCK circuit including an input, an output and a controlled terminal, and a switching circuit including an input, a first output and a second output,
the input end of the BUCK circuit is connected with the output end of the voltage stabilizing circuit, the connection node of the BUCK circuit and the voltage stabilizing circuit is the input end of the voltage conversion circuit, the output end of a switching power supply of the BUCK circuit is connected with the input end of the switching circuit, the forward output end of the BUCK circuit is connected with the first output end of the voltage reduction circuit, the connection node of the BUCK circuit and the voltage reduction circuit is the forward current output end of the voltage conversion circuit, and the reverse output end of the BUCK circuit is the reverse current output end of the voltage conversion circuit; the controlled end of the switch circuit is connected with the input end of the voltage stabilizing circuit, and the connection node of the switch circuit and the voltage stabilizing circuit is the control signal input end of the voltage conversion circuit; the input end of the voltage reduction circuit is connected with the output end of the switch circuit, and the second output end of the voltage reduction circuit is the photosensitive detection power supply output end of the voltage conversion circuit;
the BUCK circuit is used for carrying out voltage reduction processing on power signals input to the positive input end and the negative input end of the alternating current;
the voltage stabilizing circuit is used for stabilizing a control signal received by a controlled end of the switch circuit;
the switch circuit is used for outputting the first voltage or the second voltage to conduct a corresponding path according to the control signal so as to light L ED lamps;
the voltage reduction circuit is used for reducing the voltage output by the output end of the switch circuit so as to output the third voltage or the fourth voltage.
7. The L ED power supply circuit of claim 6, wherein the switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor, and a first MOS transistor, a first end of the fifth resistor, a first end of the sixth resistor, and a first end of the seventh resistor are interconnected, a connection node of the fifth resistor and the seventh resistor is an input end of the switch circuit, a second end of the fifth resistor, a second end of the sixth resistor, and a drain of the first MOS transistor are interconnected, a source of the first MOS transistor is connected to a second end of the seventh resistor, a connection node of the first MOS transistor and the seventh resistor is an output end of the switch circuit, and a gate of the first MOS transistor is a controlled end of the switch circuit.
8. The L ED power supply circuit of claim 6 wherein the buck circuit includes a first transformer, a first terminal of the first transformer being an input terminal of the buck circuit, a second terminal of the first transformer being a first output terminal of the buck circuit, a third terminal of the first transformer being a second output terminal of the buck circuit, a fourth terminal of the first transformer being connected to ground.
9. The L ED power supply circuit of claim 6, wherein the BUCK circuit includes a first chip, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fifth diode, and a sixth diode, the first chip includes a control signal input pin, an operating power pin, a feedback pin, a power signal input pin, a power signal output pin, a ground pin, and a compensation pin, the control signal input pin of the first chip, the power signal input pin of the first chip, and the first end of the ninth resistor are connected, a connection node of the first chip and the ninth resistor is an input terminal of the BUCK circuit, the operating power pin of the first chip, the first end of the twelfth resistor, the first end of the fourth capacitor, and a cathode of the fifth diode, the feedback pin of the first chip, the first terminal of the third capacitor, the thirteenth resistor, the fifth terminal of the eleventh resistor, the anode of the sixth terminal of the first chip, the eleventh resistor, the sixth terminal of the feedback pin, the eleventh resistor, the anode of the sixth terminal of the eleventh resistor, the anode of the sixth terminal of the resistor, the anode of the resistor, the anode of the sixth terminal of the resistor, the eleventh resistor, the anode of the resistor, the anode of the fifth terminal of the anode of the resistor, the anode of the resistor, the anode of the cathode of the resistor, the cathode of the anode of the cathode of the resistor, the cathode of the resistor, the anode.
10. An inductive device, comprising the L ED power supply circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921260123.3U CN211184340U (en) | 2019-08-02 | 2019-08-02 | L ED power supply circuit and induction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921260123.3U CN211184340U (en) | 2019-08-02 | 2019-08-02 | L ED power supply circuit and induction device |
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| Publication Number | Publication Date |
|---|---|
| CN211184340U true CN211184340U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921260123.3U Expired - Fee Related CN211184340U (en) | 2019-08-02 | 2019-08-02 | L ED power supply circuit and induction device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883582A (en) * | 2021-09-28 | 2022-01-04 | 广东绿岛风空气系统股份有限公司 | Bathroom heater control circuit and bathroom heater |
-
2019
- 2019-08-02 CN CN201921260123.3U patent/CN211184340U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883582A (en) * | 2021-09-28 | 2022-01-04 | 广东绿岛风空气系统股份有限公司 | Bathroom heater control circuit and bathroom heater |
| CN113883582B (en) * | 2021-09-28 | 2023-05-09 | 广东绿岛风空气系统股份有限公司 | Bathroom heater control circuit and bathroom heater |
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