CN214507425U - Constant voltage and constant current induction circuit and LED lamp - Google Patents
Constant voltage and constant current induction circuit and LED lamp Download PDFInfo
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- CN214507425U CN214507425U CN202022749793.0U CN202022749793U CN214507425U CN 214507425 U CN214507425 U CN 214507425U CN 202022749793 U CN202022749793 U CN 202022749793U CN 214507425 U CN214507425 U CN 214507425U
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Abstract
The utility model discloses a constant voltage and constant current induction circuit, which comprises a main drive circuit, a constant current circuit, a control module and a LED circuit; the main driving circuit is connected with the constant current circuit and used for outputting a constant voltage power supply to the constant current circuit; the constant current circuit is connected with the LED circuit and is used for outputting constant current to the LED circuit; the LED circuit comprises a main control module and/or an auxiliary control module, wherein the main control module is connected with a constant current circuit and used for adjusting a constant current output by the constant current circuit to the LED circuit so as to control the working state of the LED circuit, the main control module is used for controlling the on-off state of the LED circuit, and the auxiliary control module is used for controlling the brightness state of the LED circuit. The utility model also discloses a LED lamp. Adopt the utility model discloses, can control the operating condition of LED circuit in a flexible way, both can satisfy normal illumination, can realize again energy-conservingly.
Description
Technical Field
The utility model relates to a LED technical field especially relates to a constant voltage constant current induction circuit and a LED lamp.
Background
In the lighting industry, LED lamps are replacing traditional incandescent lamps and energy saving lamps in large quantities due to their characteristics of high light efficiency and long life.
With the continuous development of the LED lamp, the requirements of users on the LED lamp are higher and higher, and the requirements of energy saving, intelligent brightness adjustment, and illumination in various situations are both satisfied.
Therefore, the research and development of a constant-voltage constant-current sensing circuit and an LED lamp with simple structure and low cost have become problems to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a simple structure's constant voltage constant current induction circuit and LED lamp are provided, the operating condition of LED circuit can be controlled in a flexible way.
In order to solve the technical problem, the utility model provides a constant voltage and constant current induction circuit, which comprises a main drive circuit, a constant current circuit, a control module and an LED circuit; the main driving circuit is connected with the constant current circuit and used for outputting a constant voltage power supply to the constant current circuit; the constant current circuit is connected with the LED circuit and is used for outputting constant current to the LED circuit; the control module is connected with the constant current circuit and used for adjusting the constant current output by the constant current circuit to the LED circuit so as to control the working state of the LED circuit, the control module comprises a main control module and/or an auxiliary control module, the main control module is used for controlling the on-off state of the LED circuit, and the auxiliary control module is used for controlling the brightness state of the LED circuit.
As an improvement of the above scheme, the constant current circuit includes a constant current chip, a voltage dividing resistor and an adjusting resistor, the constant current chip is provided with a power input port, a current setting port, a constant current output port, a ground port and a PWM input port, the power input port is connected to a constant voltage power supply output by the main driving circuit through the voltage dividing resistor, the current setting port is grounded through the adjusting resistor, the constant current output port is connected to the LED circuit, the ground port is grounded, and the power input port and/or the PWM input port is connected to the control module.
As an improvement of the above scheme, the control module comprises a main control module; the constant current circuit further comprises a switch tube, and a power supply input port of the constant current chip is connected with the main control module through the switch tube.
As an improvement of the above scheme, the switching tube is an NPN type triode, a base of the NPN type triode is connected to the main control module through a first resistor and is grounded through a second resistor, a collector is connected to a power input port of the constant current chip, and an emitter is grounded.
As an improvement of the above scheme, the control module comprises a secondary control module; and the PWM input port of the constant current chip is connected with the auxiliary control module.
As an improvement of the above scheme, a power port of the main control module and/or the sub control module is connected to a constant voltage power supply output by the main drive circuit through a third resistor.
As an improvement of the above scheme, the main driving circuit comprises a driving chip, a rectifying module, a voltage transformation module, a compensation module, an adjusting module and a field effect transistor; the driving chip is provided with a power supply port, a driving port, a compensation port, a current limiting port and a voltage control port, the power supply port is connected with an external power supply through the rectification module, the driving port and the current limiting port are connected with the input end of the voltage transformation module through the field effect tube, the output end of the voltage transformation module is connected with the input end of the constant current circuit, the compensation port is grounded through the compensation module, and the voltage control port is grounded through the regulation module.
As an improvement of the scheme, the driving chip is a SY5018 chip.
Correspondingly, the utility model also provides a LED lamp, reach including the lamp body constant voltage constant current induction circuit, constant voltage constant current induction circuit locates in the lamp body.
As an improvement of the scheme, the constant voltage and constant current induction circuit is fixed on the lamp body through an aluminum substrate.
Implement the utility model has the advantages that:
the utility model discloses combine together main drive circuit, constant current circuit, control module and LED circuit and form constant voltage constant current induction circuit, the constant current that constant current circuit exported is adjusted in real time to accessible control module to realize the regulation of LED circuit, the flexibility is strong. Specifically, the method comprises the following steps: the utility model monitors the induction signal in the target area in real time through the auxiliary control module, converts the induction signal into a level signal, and controls the constant current circuit in a high-low level mode, thereby adjusting the brightness of the LED circuit; and simultaneously, the utility model discloses a main control module real-time supervision external environment's sensing signal converts sensing signal into level signal again to control constant current circuit with the mode of height level, thereby adjust the on-off state of LED circuit.
Additionally, the utility model discloses a main drive circuit adopts the isolation scheme, is in constant current circuit, control module and LED circuit in main drive circuit's secondary circuit, has reduced the impact of high voltage electric network surge, noise to constant current circuit, control module and LED circuit widely, and the electron device stress requirement of convection current constant current circuit, control module and LED circuit is lower, makes system's work more stable more reliable.
Drawings
Fig. 1 is a schematic structural diagram of the constant voltage and constant current sensing circuit of the present invention;
fig. 2 is a circuit diagram of a constant current circuit in the constant voltage and constant current sensing circuit according to the first embodiment of the present invention;
fig. 3 is a circuit diagram of a constant current circuit in the constant voltage and constant current sensing circuit according to a second embodiment of the present invention;
fig. 4 is a circuit diagram of an embodiment of the main driving circuit in the constant voltage and constant current sensing circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of the constant voltage and constant current sensing circuit of the present invention, which includes a main driving circuit 1, a constant current circuit 3, a control module 2 and an LED circuit 4. Specifically, the main driving circuit 1 is connected to a constant current circuit 3, and is configured to output a constant voltage power supply to the constant current circuit 3; the constant current circuit 3 is connected with the LED circuit 4 and is used for outputting a constant current to the LED circuit 4; the control module 2 is connected with the constant current circuit 3 and is used for adjusting the constant current output by the constant current circuit 3 to the LED circuit 4 so as to control the working state of the LED circuit 4.
When the LED driving circuit works, the main driving circuit 1 outputs a constant voltage power supply to the constant current circuit 3, and then the constant current circuit 3 outputs a constant current to the LED circuit 4. In the working process, a user can adjust the constant current output by the constant current circuit 3 in real time through the control module 2, so that the LED circuit 4 is adjusted, and the flexibility is strong.
It should be noted that the control module 2 includes a main control module and/or a sub-control module. The main control module is used for controlling the on-off state of the LED circuit 4; the secondary control module is used for controlling the brightness state of the LED circuit 4. When the constant-voltage constant-current sensing circuit is only provided with the main control module, the constant-voltage constant-current sensing circuit only has a switch control function; when the constant voltage and constant current sensing circuit is only provided with the auxiliary control module, the constant voltage and constant current sensing circuit only has the brightness control function; when the constant-voltage constant-current sensing circuit is simultaneously provided with the main control module and the auxiliary control module, the constant-voltage constant-current sensing circuit has the functions of switching and brightness control.
The present invention will be described in further detail with reference to specific examples.
Referring to fig. 2, fig. 2 shows a circuit diagram of a constant current circuit 3 in the constant voltage and constant current sensing circuit according to the present invention, and this embodiment can be applied to a constant voltage and constant current sensing circuit with a secondary control module.
As shown in fig. 2, the constant current circuit 3 includes a constant current chip U2, a voltage dividing resistor R10 and an adjusting resistor R11, the constant current chip U2 is provided with a power input port VIN, a current setting port REXT, a constant current output port OUT, a ground port GND and a PWM input port DIM, the power input port VIN is connected to a constant voltage power supply (36VDC) output by the main driving circuit 1 through the voltage dividing resistor R10, the current setting port REXT is grounded through an adjusting resistor R11, the constant current output port is connected to the LED circuit, the ground port is grounded, and the PWM input port DIM is connected to the sub-control module. The constant current chip is preferably an SM15106 chip, but not limited thereto.
When the circuit works, the main driving circuit 1 is started, and the main driving circuit 1 outputs a constant voltage power supply to the constant current circuit 3; the auxiliary control module monitors signals of moving objects in real time, so that the auxiliary control module outputs high/low level signals to a PWM input port DIM of the constant current chip U2; meanwhile, the constant current chip U2 controls the output current of the constant current output port OUT according to the high/low level signal of the PWM input port DIM, so as to adjust the brightness of the LED circuit 4, for example, 100% to 10% brightness switching.
Further, the secondary control module is a microwave sensing module, preferably ED 108. It should be noted that microwave induction is also called radar induction, and it is known from doppler effect that a radar emits a fixed frequency microwave, and the frequency of a reflected wave generated when the radar encounters a stationary object is not changed, which is reflected to the change of the frequency of the reflected wave generated by a moving object, so as to monitor whether there is an object moving. The output end of the microwave induction module is connected to a PWM input port DIM of the constant current chip, PWM dimming can be achieved when the voltage of the PWM input port DIM is 1.5-3.7V, the microwave induction module monitors that a person outputs high/low level signals through an induction area, and the brightness of the LED circuit 4 can be controlled by controlling the constant current chip U2, so that the LED circuit 4 outputs 100% of brightness when the person comes, and the LED circuit 4 maintains 10% of brightness output when the person leaves.
Referring to fig. 3, fig. 3 shows a circuit diagram of a constant current circuit 3 in the constant voltage and constant current sensing circuit of the present invention, which is different from the first embodiment shown in fig. 2, and the present embodiment can be applied to a constant voltage and constant current sensing circuit with a main control module and an auxiliary control module.
As shown in fig. 3, the constant current circuit 3 further includes a switch Q2, and the power input port VIN of the constant current chip U2 is connected to the main control module through the switch Q2.
In this embodiment, the switching tube Q2 is an NPN type triode, a base of the NPN type triode is connected to the main control module through a first resistor R15 and is grounded through a second resistor R14, a collector of the NPN type triode is connected to the power input port VIN of the constant current chip U2, and an emitter of the NPN type triode is grounded.
During operation, the main driving circuit 1 is started, the main control module monitors the ambient brightness in real time, and outputs high/low level signals through the output end to control the switching tube Q2 to be switched on or switched off, so that the voltage of the power supply tube of the power input port VIN of the constant current chip U2 is controlled, the constant current chip U2 is controlled to be started or not started, and finally the on and off of the LED lamp beads in the LED circuit 4 are controlled. Meanwhile, the auxiliary control module monitors whether a person passes through the monitoring area in real time, an output port of the auxiliary control module outputs a high/low level signal, dimming is performed through a PWM input port DIM of the constant current chip U2, and brightness adjustment (such as 100% -10% brightness switching) of LED lamp beads in the LED circuit 4 can be achieved.
Accordingly, the main control module may be a photo sensing module. It should be noted that the light sensing device in the light sensing module is sensitive to a specific wavelength (850nm infrared ray) in the sunlight, and can effectively identify the day and night and output a high/low level signal. The output end of the light sensing module is connected to the base of the switch tube Q2 through a resistor R15, the collector of the switch tube Q2 is connected to the power input port VIN of the constant current chip U2, and the on-off state of the LED circuit 4 is controlled by controlling the power supply voltage of the power input port VIN in the constant current chip U2. When the light sensing module outputs a high level in the daytime, the switching tube Q2 is switched on, the voltage of the power input port VIN of the constant current chip U2 is pulled down, the constant current chip U2 is not started, the constant current chip U2 does not output, and the LED lamp beads in the LED circuit 4 are not on. When monitoring that the night is night, the light sensing module outputs low level, the switching tube Q2 is cut off, the constant current chip U2 is started, and the LED lamp beads in the LED circuit 4 are lightened.
Meanwhile, the secondary control module may be an infrared human body sensing module, preferably FMFZXDP 76. It should be noted that the output end of the infrared human body sensing module is connected to a PWM input port DIM of the constant current chip U2, wherein the voltage of the PWM input port DIM is 1.5-3.7V to implement PWM dimming, the infrared human body sensing module monitors whether a person passes through the sensing region and outputs a high/low level signal, and controls the brightness of the LED lamp bead in the LED circuit 4 by controlling the constant current chip U2. The lamp bead can output 100% brightness when people come, and people walk to keep 10% bright beads.
Furthermore, a power supply port VCC of the main control module and/or the auxiliary control module is connected with the constant voltage power supply output by the main drive circuit through a third resistor R8, so that power supply to the main control module and/or the auxiliary control module is realized.
In addition, the auxiliary control module can also be provided with a time delay function, so that normal illumination can be met, and energy conservation can be realized.
Referring to fig. 4, fig. 4 shows a circuit diagram of an embodiment of a main driving circuit 1 in the constant-voltage and constant-current sensing circuit of the present invention, where the main driving circuit 1 includes a driving chip U1, a rectifying module M, a voltage transformation module N, a compensation module Q, an adjusting module P, and a field-effect transistor Q1; the driving chip U1 is provided with a power supply port VIN, a driving port DRV, a compensation port COMP, a current limiting port ISEN and a voltage control port VSEN. The driving chip U1 is a SY5018 chip, but not limited thereto. Specifically, the method comprises the following steps:
the power supply port VIN is connected with an external power supply through the rectification module M; the rectifying module M comprises a rectifying bridge DB1, a first capacitor C1 and a resistor R2, the output end of the rectifying bridge DB1 is connected with the first capacitor C1 in parallel, and the forward direct-current output end of the rectifying bridge DB1 is connected with a power supply port VIN through the resistor R2.
The driving port DRV and the current limiting port ISEN are connected with the input end of the voltage transformation module N through the field effect transistor Q1, and the output end of the voltage transformation module N is connected with the input end of the constant current circuit 3; the transformer module N comprises an RC parallel circuit, a second diode D2, a transformer T1, a first diode D1 and a third capacitor C3, the RC parallel circuit is connected with the second diode D2 in series and then is connected to the primary coil of the transformer T1, the secondary coil of the transformer T1 is connected with the third capacitor C3 in parallel, and the first diode D1 is arranged between the secondary coil of the transformer T1 and the third capacitor C3; the drain electrode of the field effect transistor Q1 is connected with the primary coil of the transformer T1, the grid electrode of the field effect transistor Q1 is connected with the driving port DRV through a resistor R3, and the source electrode of the field effect transistor Q1 is connected with the current limiting port ISEN and is grounded through a resistor R4;
the compensation port COMP is grounded through the compensation module Q, wherein the value can be effectively adjusted through the compensation module Q; specifically, the compensation module Q includes an RC series circuit and a sixth capacitor C6 connected in parallel with the RC series circuit.
The voltage control port VSEN is grounded through the regulating module P; wherein the adjusting module P comprises a fourth capacitor C4, a third diode D3, a resistor R5, a resistor R6 and an inductor NAUXThe power supply port VIN is grounded through a fourth capacitor C4, and is grounded through a third diode D3, a resistor R5 and a resistor R6 in sequence, the voltage control port VSEN is grounded through a resistor R6, and the inductor N is connected to the groundAUXOne end of which is connected to the anode of the third diode D3 and the other end of which is grounded.
Therefore, the main driving circuit 1 of the present invention adopts an isolation scheme to provide a 36V dc output for the constant current circuit 3. The constant current circuit 3, the control module 2 and the LED circuit 4 are all arranged in a secondary circuit of the main driving circuit 1, so that the impact of high-voltage power grid surge and noise on the constant current circuit 3, the control module 2 and the LED circuit 4 is greatly reduced, the stress requirement on electronic devices of the constant current circuit 3, the control module 2 and the LED circuit 4 is lower, and the system works more stably and reliably.
Additionally, the utility model also discloses a LED lamp, it includes lamp body and constant voltage constant current induction circuit, constant voltage constant current induction circuit locates in the lamp body.
Further, the constant voltage and constant current sensing circuit is fixed on the lamp body through an aluminum substrate.
Preferably, the lamp body is a metal lamp body. It should be noted that the constant-voltage and constant-current sensing circuit uses an aluminum substrate as a heat sink, and since the aluminum substrate has a thin insulating layer, it is easily broken at high temperature and high pressure. In the prior art, a main driving circuit adopts a non-isolation scheme, and in the state, people touch a metal lamp body to cause electric shock risk; and the main drive circuit in the application adopts an isolation scheme, so that the electric shock risk can be effectively avoided.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and decorations can be made without departing from the principle of the invention, and these modifications and decorations are also regarded as the protection scope of the present invention.
Claims (10)
1. A constant voltage and constant current induction circuit is characterized by comprising a main driving circuit, a constant current circuit, a control module and an LED circuit;
the main driving circuit is connected with the constant current circuit and used for outputting a constant voltage power supply to the constant current circuit;
the constant current circuit is connected with the LED circuit and is used for outputting constant current to the LED circuit;
the control module is connected with the constant current circuit and used for adjusting the constant current output by the constant current circuit to the LED circuit so as to control the working state of the LED circuit, the control module comprises a main control module and/or an auxiliary control module, the main control module is used for controlling the on-off state of the LED circuit, and the auxiliary control module is used for controlling the brightness state of the LED circuit.
2. The constant-voltage constant-current sensing circuit as claimed in claim 1, wherein the constant-current circuit comprises a constant-current chip, a voltage dividing resistor and a regulating resistor, the constant-current chip is provided with a power input port, a current setting port, a constant-current output port, a ground port and a PWM input port, the power input port is connected with a constant-voltage power supply output by the main driving circuit through the voltage dividing resistor, the current setting port is grounded through the regulating resistor, the constant-current output port is connected with the LED circuit, the ground port is grounded, and the power input port and/or the PWM input port is connected with the control module.
3. The constant voltage and constant current sensing circuit according to claim 2, wherein the control module comprises a main control module;
the constant current circuit further comprises a switch tube, and a power supply input port of the constant current chip is connected with the main control module through the switch tube.
4. The constant-voltage constant-current sensing circuit as claimed in claim 3, wherein the switching tube is an NPN type triode, a base of the NPN type triode is connected with the main control module through a first resistor and is grounded through a second resistor, a collector of the NPN type triode is connected with a power input port of the constant-current chip, and an emitter of the NPN type triode is grounded.
5. The constant-voltage constant-current sensing circuit as claimed in claim 2, wherein the control module comprises a sub-control module, and the PWM input port of the constant-current chip is connected to the sub-control module.
6. The constant-voltage constant-current sensing circuit as claimed in claim 1, wherein a power port of the main control module and/or the sub-control module is connected to a constant-voltage power supply outputted from the main driving circuit through a third resistor.
7. The constant-voltage constant-current sensing circuit as claimed in claim 1, wherein the main driving circuit comprises a driving chip, a rectifying module, a transforming module, a compensating module, a regulating module and a field effect transistor;
the driving chip is provided with a power supply port, a driving port, a compensation port, a current limiting port and a voltage control port, the power supply port is connected with an external power supply through the rectification module, the driving port and the current limiting port are connected with the input end of the voltage transformation module through the field effect tube, the output end of the voltage transformation module is connected with the input end of the constant current circuit, the compensation port is grounded through the compensation module, and the voltage control port is grounded through the regulation module.
8. The constant-voltage constant-current sensing circuit as claimed in claim 7, wherein the driving chip is a SY5018 chip.
9. An LED lamp, comprising a lamp body and the constant voltage and constant current sensing circuit according to any one of claims 1 to 8, wherein the constant voltage and constant current sensing circuit is disposed in the lamp body.
10. The LED lamp of claim 9, wherein the constant voltage and constant current sensing circuit is fixed to the lamp body through an aluminum substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022749793.0U CN214507425U (en) | 2020-11-24 | 2020-11-24 | Constant voltage and constant current induction circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022749793.0U CN214507425U (en) | 2020-11-24 | 2020-11-24 | Constant voltage and constant current induction circuit and LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214507425U true CN214507425U (en) | 2021-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022749793.0U Active CN214507425U (en) | 2020-11-24 | 2020-11-24 | Constant voltage and constant current induction circuit and LED lamp |
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| CN (1) | CN214507425U (en) |
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- 2020-11-24 CN CN202022749793.0U patent/CN214507425U/en active Active
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