An emergency detection and multi-input power supply lighting circuit

Abstract

The present invention provides an emergency detection and multi-input power supply lighting circuit, including a step-down module and a control output voltage module; the step-down module is connected to the power supply input and the control output voltage module, the control output voltage module is connected to the control unit, and the control unit is connected to the lighting load; the step-down module converts the high AC or high DC input of the power supply into low AC or low DC, and transmits it to the control output voltage module; when DC is input, the control output voltage module is turned on and outputs a certain voltage to the control unit; when AC is input, the control output voltage module is turned on according to the frequency of the AC and outputs a certain voltage to the control unit; the control unit outputs different duty cycles according to the received AC signal or DC signal to control the lighting load; when the power input is powered off, the control output voltage module outputs a low level to the control unit. The application of this technical solution can realize the rapid detection of the input voltage characteristics of the power supply.

Description

Technical Field

[0001] The present invention relates to the field of lighting, and in particular to an emergency detection and multi-input power supply lighting circuit. Background Art

[0002] In order to be compatible with AC, pulsating direct voltage, and DC voltage, existing current source products usually design the power supply as a full-voltage input power supply. When the input is AC, pulsating direct voltage, or DC voltage, the power supply output brightness is fixed, and there is no detection and judgment for different input voltages. In markets such as Europe and Australia, when the mains power is cut off, they usually start the emergency power supply cabinet, and the output of their emergency power supply cabinet is usually DC voltage or 100Hz pulsating direct voltage. In emergencies, low-brightness output is generally required to achieve energy saving, which early power supplies cannot achieve. In addition, when the wall switch controls the mains input to power on and off quickly, traditional Bluetooth or Wifi products cannot quickly power off due to the large power supply electrolyte, so they cannot quickly reset or dim and adjust the color. Summary of the invention

[0003] The object of the present invention is to provide an emergency detection and multi-input power supply lighting circuit, which can realize rapid detection of the input voltage characteristics of the power supply.

[0004] In order to solve the above technical problems, the present invention provides an emergency detection and multi-input power supply lighting circuit, including a step-down module and a control output voltage module; the step-down module is connected to the power input and the control output voltage module, the control output voltage module is connected to the control unit, and the control unit is connected to the lighting load; the step-down module converts the high AC or high DC input of the power supply into low AC or low DC, and transmits it to the control output voltage module; when DC is input, the control output voltage module is turned on and outputs a certain voltage to the control unit; when AC is input, the control output voltage module is turned on according to the frequency of the AC and outputs a certain voltage to the control unit; the control unit outputs different duty cycles according to the received AC signal or DC signal to control the lighting load; when the power input is powered off, the control output voltage module outputs a low level to the control unit.

[0005] In a preferred embodiment, the step-down module further includes a rectifier unit; when AC power is input, the rectifier unit of the step-down module rectifies the AC power and then inputs the rectifier unit into the control output voltage module.

[0006] In a preferred embodiment, the output voltage control module specifically includes an optical coupler; the input end of the optical coupler is connected to the voltage reduction module, and the output end of the optical coupler is connected to the control unit.

[0007] In a preferred embodiment, the cathode of the light-emitting diode of the optocoupler is connected to a switch tube, and the anode of the light-emitting diode is connected to a power supply; one end output of the phototransistor of the optocoupler is connected to a control unit, and the other end output of the phototransistor is connected to a transformer.

[0008] In a preferred embodiment, the power input reaches the switch tube through a step-down module to control the on and off of the switch tube. When the switch tube is turned on, the optocoupler is turned on; when the switch tube is not turned on, the optocoupler is not turned on, and one end of the photosensitive transistor connected to the control unit outputs a low level.

[0009] In a preferred embodiment, the step-down module specifically includes a first voltage-dividing resistor, and the rectifier unit is specifically a first diode; the positive electrode of the first diode is connected to the input power supply, the negative electrode of the first diode is connected to one end of the first voltage-dividing resistor, the other end of the first voltage-dividing resistor is connected to one end of a current-limiting resistor, the other end of the current-limiting resistor is connected to the negative electrode of a first voltage-limiting diode, the positive electrode of the first voltage-limiting diode is connected to the base of a switching tube, the emitter of the switching tube is grounded, and the collector of the switching tube is connected to the negative electrode of the light-emitting diode of the optocoupler.

[0010] In a preferred embodiment, one end of the second voltage-dividing resistor is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the other end of the second voltage-dividing resistor is grounded; the cathode of the second voltage-stabilizing diode is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the anode of the second voltage-stabilizing diode is grounded; one end of the first capacitor is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the other end of the first capacitor is grounded;

[0011] One end of the third voltage-dividing resistor is connected to one end of the phototransistor connection transformer of the optocoupler, the other end of the third voltage-dividing resistor is connected to one end of the second capacitor and the cathode of the third diode, the other end of the second capacitor is grounded, and the anode of the third diode is connected to the same end of the transformer.

[0012] In a preferred embodiment, the positive electrode of the light-emitting diode of the optocoupler is connected to the first resistor and one end of the second resistor, the other end of the first resistor is grounded, the other end of the second resistor is connected to one end of the third capacitor and the negative electrode of the second diode, the other end of the third capacitor is grounded; the positive electrode of the second diode is connected to the power supply.

[0013] In a preferred embodiment, the DC voltage is input to the step-down module and stepped down by the first voltage-dividing resistor, and then the switch tube is controlled to be turned on. The switch tube is turned on to turn on the light-emitting diode, thereby turning on the phototransistor and outputting a constant output voltage, which is then divided by the second voltage-dividing resistor and the third voltage-dividing resistor to output a high-level signal to the control unit.

[0014] In a preferred embodiment, the AC voltage is input to the step-down module, firstly half-wave rectified by the first diode, then stepped down by the first voltage-dividing resistor, and then the switch tube is controlled to be turned on or off, so that the light-emitting diode is turned on or off, thereby controlling the phototransistor to be turned on or off, so that the conduction frequency of the optical coupler is consistent with the frequency of the AC voltage, so that the phototransistor outputs a square wave signal of the same frequency to the control unit.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0016] The present invention provides an emergency detection and multi-input power supply lighting circuit, which can quickly detect different input voltage characteristics, thereby outputting waveform signals with different characteristics to a control unit. The control unit outputs different duty cycles to control different brightness of the lighting load, thereby achieving energy saving. The circuit can also quickly detect power failure of the mains, meeting the requirement for rapid reset of smart products. When the control unit receives different signals, it can make different responses according to design requirements, meeting energy saving and multiple sample requirements of customers and the market. Because the circuit has low cost, fast response speed, and high reliability, it can be promoted as a basic circuit for smart products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an emergency detection and multi-input power supply lighting circuit in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] An emergency detection and multi-input power supply lighting circuit, reference Figure 1, including a step-down module and a control output voltage module; the step-down module is connected to the power input and the control output voltage module, the control output voltage module is connected to the control unit, and the control unit is connected to the lighting load; the step-down module converts the high AC or high DC input of the power supply into low AC or low DC, and transmits it to the control output voltage module; when DC is input, the control output voltage module is turned on and outputs a certain voltage to the control unit; when AC is input, the control output voltage module is turned on and outputs a certain voltage to the control unit according to the frequency of the AC; the control unit outputs different duty ratios according to the received AC signal or DC signal to control the brightness of the lighting load, so that the control unit can output different duty ratios to the power supply after judging the waveform signals with different characteristics to achieve different brightness outputs, meeting the energy saving requirements. When the power input is powered off, the control output voltage module outputs a low level to the control unit, so that the control unit responds in time, thereby achieving rapid detection of power on and power off of the mains.

[0020] Specifically, the step-down module further includes a rectifier unit; when AC power is input, the rectifier unit of the step-down module rectifies the AC power and then inputs it into the control output voltage module. The control output voltage module specifically includes an optical coupler U2; the input end of the optical coupler U2 is connected to the step-down module, and the output end of the optical coupler U2 is connected to the control unit.

[0021] Specifically, the cathode of the light-emitting diode of the optical coupler U2 is connected to a switch tube Q2, and the anode of the light-emitting diode is connected to the power supply; one end of the phototransistor of the optical coupler U2 is output and connected to the control unit, and the other end of the phototransistor is output and connected to a transformer. Specifically, the anode of the light-emitting diode of the optical coupler U2 is the first pin 1, the cathode of the light-emitting diode of the optical coupler U2 is the second pin 2, one end of the phototransistor of the optical coupler U2 connected to the control unit is the third pin 3, and one end of the phototransistor of the optical coupler U2 connected to the transformer is specifically the fourth pin 4. In this embodiment, the switch tube Q2 is specifically an NPN transistor. The power input reaches the switch tube Q2 through the step-down module to control the on and off of the switch tube Q2. When the switch tube Q2 is turned on, the optical coupler U2 is turned on, the switch tube Q2 is not turned on, and the optical coupler U2 is not turned on. One end of the phototransistor connected to the control unit outputs a low level.

[0022] The step-down module specifically includes a first voltage-dividing resistor, and the rectifier unit is specifically a first diode D8; the positive electrode of the first diode D8 is connected to the input power supply, the negative electrode of the first diode D8 is connected to one end of the first voltage-dividing resistor, and the other end of the first voltage-dividing resistor is connected to one end of a current-limiting resistor R7; specifically, the first voltage-dividing resistor is specifically formed by a fourth resistor R4 and a fifth resistor R5 connected in series, the fifth resistor R5 is also connected to a sixth resistor R6, the other end of the sixth resistor R6 is grounded, and one end of the current-limiting resistor R7 is connected between the fifth resistor R5 and the sixth resistor R6. The other end of the current-limiting resistor R7 is connected to the negative electrode of the first voltage-limiting diode ZD1, the positive electrode of the first voltage-limiting diode ZD1 is connected to the base of the switch tube Q2, the emitter of the switch tube Q2 is grounded, the collector of the switch tube Q2 is connected to the second pin 2 of the optical coupler U2, and the two ends of the third resistor R7A are connected between the emitter of the switch tube Q2 and the base of the switch tube Q2.

[0023] One end of the second voltage-dividing resistor R11 is connected between the third pin 3 of the optical coupler U2 and the control unit, and the other end of the second voltage-dividing resistor R11 is grounded; the cathode of the second voltage-stabilizing diode ZD2 is connected between the third pin 3 of the optical coupler U2 and the control unit, and the anode of the second voltage-stabilizing diode ZD2 is grounded; one end of the first capacitor C9 is connected between the third pin 3 of the optical coupler U2 and the control unit, and the other end of the first capacitor C9 is grounded;

[0024] One end of the third voltage-dividing resistor R10 is connected to the fourth pin 4 of the optical coupler U2, the other end of the third voltage-dividing resistor R10 is connected to one end of the second capacitor C12 and the negative electrode of the third diode D10, the other end of the second capacitor C12 is grounded, and the positive electrode of the third diode D10 is connected to the same-name end of the transformer. Specifically, the third pin 3 is specifically a P_DOWM port, and the second capacitor C12 is a 1uF ceramic capacitor with a small capacity. Therefore, when the input voltage is powered off, the output P_DOWM port level will immediately flip to a low level. Similarly, when the input is powered on, the output P_DOWM port level will immediately flip from a low level to a high level or a square wave signal. The control unit can respond quickly using this change, and can perform operations such as resetting or adjusting the brightness and color temperature. When the output of the optocoupler U2 is turned on, the second voltage-dividing resistor R11 and the third voltage-dividing resistor R10 can divide the higher output voltage into a voltage acceptable to the control unit, such as 5V. The second voltage-stabilizing diode ZD2 can be a 5.1V voltage-stabilizing diode to absorb voltage spikes and protect the control unit. The first capacitor C9 can be a smaller capacity to eliminate noise and interference and prevent the control unit from misdetecting. When the first pin 1 and the second pin 2 of the optocoupler U2 are turned on, the third pin 3 and the fourth pin 4 are turned on, and the third pin 3, namely P_DOWM, can obtain a high level of 5V. When the first pin 1 and the second pin 2 of the optocoupler U2 are turned off, the third pin 3 and the fourth pin 4 are not turned on, and the third pin 3, namely P_DOWM, can obtain a low level of 0V.

[0025] The first pin 1 of the optical coupler U2 is connected to one end of the first resistor R9 and the second resistor R8, the other end of the first resistor R9 is grounded, the other end of the second resistor R8 is connected to one end of the third capacitor C8 and the cathode of the second diode D9, the other end of the third capacitor C8 is grounded; the anode of the second diode D9 is connected to the power supply. The first pin 1 of the optical coupler U2 is powered by the auxiliary winding of the main power supply through the second diode D9, the third capacitor C8, and the second resistor R8.

[0026] After the DC voltage is input to the step-down module and stepped down by the first voltage-dividing resistor, the switch tube Q2 is controlled to be turned on. The switch tube Q2 is turned on to turn on the light-emitting diode, so that the phototransistor is turned on and outputs a constant output voltage, and then divided by the second voltage-dividing resistor R11 and the third voltage-dividing resistor R10 to output a high-level signal to the control unit. By setting the parameters of the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the current-limiting resistor R7, and the first voltage-stabilizing diode ZD1, the optical coupler U2 can be ensured to be turned on throughout the process. The AC voltage is input to the step-down module, firstly half-wave rectified by the first diode D8, then stepped down by the first voltage-dividing resistor, and then the switch tube Q2 is controlled to be turned on or off, so that the light-emitting diode is turned on or off, thereby controlling the phototransistor to be turned on or off, so that the frequency of the conduction of the optical coupler U2 is consistent with the frequency of the AC voltage, so that the phototransistor outputs a square wave signal of the same frequency to the control unit. Through the processing of the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the current limiting resistor R7, and the first voltage zener diode ZD1, it can be ensured that the optical coupler U2 is turned on at a certain set voltage at the peak of the AC voltage, and the optical coupler U2 is not turned on when the voltage is lower than the set voltage, and the frequency of the optical coupler U2 turning on is consistent with the frequency of the input AC voltage.

[0027] In this embodiment, when the input is 50Hz AC, the AC voltage is processed by the first diode D8, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the current limiting resistor R7, and the first voltage stabilizing diode ZD1 at the front end of the optocoupler to become a lower and current-limited voltage to the switch tube Q2 to control its conduction and shutdown, then the output P_DOWM will obtain a square wave voltage with a frequency of 50Hz and an amplitude of 5V. Similarly, when the input is an AC voltage of 100HZ, the output will obtain a square wave voltage with a frequency of 100Hz and an amplitude of 5V. When the input is a DC high-level voltage, the output will obtain a DC high-level voltage with an amplitude of 5V. When the MCU receives different signals, it can make different responses according to the design requirements, which has met the energy saving and customer and market multi-sample requirements.

[0028] The present invention provides an emergency detection and multi-input power supply lighting circuit, which can quickly detect different input voltage characteristics, thereby outputting waveform signals with different characteristics to a control unit. The control unit outputs different duty cycles to control different brightness of the lighting load, thereby achieving energy saving. The circuit can also quickly detect power failure of the mains, meeting the requirement for rapid reset of smart products. When the control unit receives different signals, it can make different responses according to design requirements, meeting energy saving and multiple sample requirements of customers and the market. Because the circuit has low cost, fast response speed, and high reliability, it can be promoted as a basic circuit for smart products.

[0029] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. An emergency detection and multi-input power supply lighting circuit, characterized in that It includes a step-down module and a control output voltage module; the step-down module is connected to the power input and the control output voltage module, the control output voltage module is connected to the control unit, and the control unit is connected to the lighting load; the step-down module converts the high AC or high DC input of the power supply into low AC or low DC, and transmits it to the control output voltage module; when DC is input, the control output voltage module is turned on and outputs a certain voltage to the control unit; when AC is input, the control output voltage module is turned on according to the frequency of the AC and outputs a certain voltage to the control unit; the control unit outputs different duty cycles according to the received AC signal or DC signal to control the lighting load; when the power input is powered off, the control output voltage module outputs a low level to the control unit.

2. The emergency detection and multi-input power supply lighting circuit according to claim 1, characterized in that: The step-down module further includes a rectifying unit; when AC power is input, the rectifying unit of the step-down module rectifies the AC power and then inputs the rectified power into the control output voltage module.

3. The emergency detection and multi-input power supply lighting circuit according to claim 2, characterized in that: The output voltage control module specifically includes an optical coupler; the input end of the optical coupler is connected to the voltage reduction module, and the output end of the optical coupler is connected to the control unit.

4. The emergency detection and multi-input power supply lighting circuit according to claim 3, characterized in that: The cathode of the light-emitting diode of the optical coupler is connected to a switch tube, and the anode of the light-emitting diode is connected to a power supply; one end output of the phototransistor of the optical coupler is connected to a control unit, and the other end output of the phototransistor is connected to a transformer.

5. The emergency detection and multi-input power supply lighting circuit according to claim 4, characterized in that: The power input reaches the switch tube through the step-down module to control the on and off of the switch tube. When the switch tube is turned on, the optocoupler is turned on. When the switch tube is not turned on, the optocoupler is not turned on, and one end of the phototransistor connected to the control unit outputs a low level.

6. The emergency detection and multi-input power supply lighting circuit according to claim 5, characterized in that: The step-down module specifically includes a first voltage-dividing resistor, and the rectifying unit is specifically a first diode; the positive electrode of the first diode is connected to the input power supply, the negative electrode of the first diode is connected to one end of the first voltage-dividing resistor, the other end of the first voltage-dividing resistor is connected to one end of a current-limiting resistor, the other end of the current-limiting resistor is connected to the negative electrode of a first voltage-limiting diode, the positive electrode of the first voltage-limiting diode is connected to the base of a switching tube, the emitter of the switching tube is grounded, and the collector of the switching tube is connected to the negative electrode of the light-emitting diode of the optocoupler.

7. The emergency detection and multi-input power supply lighting circuit according to claim 6, characterized in that: One end of the second voltage-dividing resistor is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the other end of the second voltage-dividing resistor is grounded; the cathode of the second voltage-stabilizing diode is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the anode of the second voltage-stabilizing diode is grounded; one end of the first capacitor is connected between one end of the phototransistor of the optical coupler connected to the control unit and the control unit, and the other end of the first capacitor is grounded; One end of the third voltage-dividing resistor is connected to one end of the phototransistor connection transformer of the optocoupler, the other end of the third voltage-dividing resistor is connected to one end of the second capacitor and the cathode of the third diode, the other end of the second capacitor is grounded, and the anode of the third diode is connected to the same end of the transformer.

8. The emergency detection and multi-input power supply lighting circuit according to claim 7, characterized in that: The positive electrode of the light-emitting diode of the optocoupler is connected to one end of the first resistor and the second resistor, the other end of the first resistor is grounded, the other end of the second resistor is connected to one end of the third capacitor and the negative electrode of the second diode, the other end of the third capacitor is grounded; the positive electrode of the second diode is connected to the power supply.

9. The emergency detection and multi-input power supply lighting circuit according to claim 8, characterized in that: The DC voltage is input to the step-down module and then stepped down by the first voltage-dividing resistor, and then the switch tube is controlled to be turned on. The switch tube is turned on so that the light-emitting diode is turned on, thereby turning on the phototransistor and outputting a constant output voltage, which is then divided by the second and third voltage-dividing resistors to output a high-level signal to the control unit.

10. The emergency detection and multi-input power supply lighting circuit according to claim 8, characterized in that: The AC voltage is input to the step-down module, firstly half-wave rectified by the first diode, then stepped down by the first voltage-dividing resistor, and then the switch tube is controlled to be turned on or off, so that the light-emitting diode is turned on or off, thereby controlling the phototransistor to be turned on or off, so that the conduction frequency of the optical coupler is consistent with the frequency of the AC voltage, so that the phototransistor outputs a square wave signal of the same frequency to the control unit.

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