A driving and controlling device for stage laser lamps

Abstract

The present invention provides a driving and control device for a stage laser lamp. The control device is used in cooperation with a laser module. The control device includes a delay closing unit, a laser module light source driving unit, a laser module power supply auxiliary unit, and a power-off power supply unit. The output end of the delay closing unit is connected to the input end of the laser module light source driving unit. The output end of the laser module light source driving unit is connected to the input end of the laser module. The output end of the laser module is connected to the input end of the delay closing unit. The input end of the delay closing unit is further connected to the input end of the laser module power supply auxiliary unit. The laser module power supply auxiliary unit is connected to the laser module. The output end of the laser module power supply auxiliary unit is further connected to the input end of the laser module through the power-off power supply unit. The function of this device is to protect the phosphor in the laser module from being damaged by micro-flashing during the power-on and power-off moments of the laser lamp.

Description

Technical Field

[0001] The present invention relates to the field of circuit control, and more specifically, to a driving and control device for stage laser lamps. Background Art

[0002] The laser module has strict requirements for the power-on sequence and power-off sequence of the internal circuit. First, the color wheel motor of the laser module must be powered on and run smoothly before the LED in the module can be lit; before stopping the module from working, the LED is turned off first, and then the color wheel motor is turned off. Such special requirements of the laser module inevitably lead to high requirements for control and drive.

[0003] At present, for laser lamps in the stage lighting industry, the LED drive of the laser module adopts the BOOST (boost) topology mode. Although this mode well solves the problem of momentary flashing during the power-on of the laser module, since the LED can only work stably when the voltage is boosted to exceed 15% of the LED voltage starting value in the boost BOOST mode, the starting point of this mode of drive is relatively high, and there are phenomena such as slight flashing, uneven dimming, and low efficiency during the PWM dimming process. For indoor lighting, film and television lighting and other occasions with stricter dimming requirements for stage lamps, it obviously cannot meet the market demand. In order to meet the market demand, the BUCK topology mode of drive must be adopted. The disadvantage of this mode is that there may be a slight flashing of the LED due to poor protection during the power-on moment. This slight flashing is not a problem for ordinary LED lamps, but it is fatal to the laser module.

[0004] Secondly, due to the charge stored in the output capacitor of the switching power supply at the moment of lamp power-off, there will be an afterglow of the laser module LED, which is also fatal to the laser module. Summary of the Invention

[0005] In order to solve the above-mentioned deficiencies of the prior art, the present invention proposes a driving and control device for stage laser lamps, and using this device can well solve the problem of power-on and power-off of the laser module.

[0006] In order to solve the above problems, the technical solution of the present invention is as follows:

[0007] The present invention provides a driving and control device for a stage laser lamp. This control device is used in cooperation with a laser module. The control device includes a delay closing unit, a laser module light source driving unit, a laser module power supply auxiliary unit, and a power-off power supply unit. The output end of the delay closing unit is connected to the input end of the laser module light source driving unit. The output end of the laser module light source driving unit is connected to the input end of the laser module. The output end of the laser module is connected to the input end of the delay closing unit. The input end of the delay closing unit is also connected to the input end of the laser module power supply auxiliary unit. The laser module power supply auxiliary unit is connected to the laser module. The output end of the laser module power supply auxiliary unit is also connected to the input end of the laser module through the power-off power supply unit.

[0008] The entire control process is as follows: When the LED lamp is powered on, first the laser module power supply auxiliary unit is powered on. The laser module power supply auxiliary unit supplies power to the color wheel motor control circuit of the laser module. After the color wheel motor operates stably, it will send a feedback signal to the delay closing unit and the laser module power supply auxiliary unit. The delay closing unit delays for a period of time through a delay circuit and then closes the switch to supply power to the laser module light source driving unit. This function fully solves the problem that the color wheel motor does not operate stably at the moment of lamp power-on, and the LED flickers, causing damage to the phosphor. The laser module power supply auxiliary unit receives the feedback signal and can only send a PWM signal to the laser module light source driving unit after confirming whether it is the correct signal, thereby driving the module LED. When the lamp is powered off instantaneously, the power-off power supply unit immediately turns on the battery to supply power to the color wheel motor control circuit of the laser module to make the color wheel motor continue to work for a period of time, protecting the phosphor from damage caused by the slight flash or afterglow of the laser module LED at the moment of lamp power-off.

[0009] Compared with the prior art, the beneficial effect of the present invention is that the function of this device is to protect the phosphor in the laser module from damage due to slight flashes at the moment of laser lamp power-on and power-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a block diagram of the control device of the present invention;

[0011] Figure 2 It is a circuit structure diagram of the laser module light source driving unit;

[0012] Figure 3 It is a circuit structure diagram of the power-off power supply unit. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0014] Such as Figure 1, a driving control device for stage laser lamps, which is used in cooperation with a laser module. The control device includes a delay closing unit 1, a laser module light source driving unit 2, a laser module power supply auxiliary unit 3, and a power-off power supply unit 4; the output end of the delay closing unit 1 is connected to the input end of the laser module light source driving unit 2, the output end of the laser module light source driving unit 2 is connected to the input end of the laser module, and the output end of the laser module is connected to the input end of the delay closing unit 1; the input end of the delay closing unit 1 is also connected to the input end of the laser module power supply auxiliary unit 3, and the laser module power supply auxiliary unit 3 is connected to the laser module; the output end of the laser module power supply auxiliary unit 3 is also connected to the input end of the laser module through the power-off power supply unit 4.

[0015] The whole control process is as follows: When the LED lamp is powered on, first the laser module power supply auxiliary unit 3 is powered on. The laser module power supply auxiliary unit 3 supplies power to the color wheel motor control circuit of the laser module. After the color wheel motor works stably, it will send a feedback signal to the delay closing unit 1 and the laser module power supply auxiliary unit 3. The delay closing unit 1 delays for a period of time through the RC delay circuit to close the switch K and supply power to the laser module light source driving unit 2.

[0016] This function fully solves the problem that the color wheel motor does not run stably at the moment of lamp power-on, and the LED flashes, causing damage to the phosphor; the laser module power supply auxiliary unit 3 judges and receives the feedback signal through the CPU and sends a PWM signal to the laser module light source driving unit 2, thereby driving the module LED; when the lamp is powered off instantaneously, the power-off power supply unit 4 immediately turns on the battery to supply power to the color wheel motor control circuit of the laser module to make the color wheel motor continue to work for a period of time, protecting the phosphor from being damaged by the micro-flash or afterglow of the laser module LED at the moment of lamp power-off. The function of this device is to protect the phosphor in the laser module from being damaged by micro-flash at the moment of laser lamp power-on and power-off.

[0017] Such as Figure 2 , the working process of the delay closing unit 1 is as follows: When receiving the high-level EN signal of the laser module feedback signal, it charges the capacitor C3 through the resistor R1. When the voltage of C3 reaches the turn-on voltage of the NMOS transistor Q1, Q1 conducts. At this time, the gate voltage of the PMOS transistor Q2 decreases, and Q2 conducts. The VCC voltage flows from the source of the PMOS transistor into the gate interface OUT, and the interface OUT is connected to the LED drive of the laser module;

[0018] The turn-on time T of Q1 can be calculated according to the formula: T = R1C3 * ln[(V1 - V0) / (V1 - Vt)], where V1 represents the voltage that the C3 capacitor finally charges to, V0 is the voltage across the capacitor C1 before charging; Vt is the voltage across the capacitor C1 at time t.

[0019] Such as Figure 3, the working process of the power-off power supply unit 4 is as follows: when the LED lamp is powered on, it provides a 5V voltage for this circuit. The 5V voltage charges the capacitor C2 through the resistor R4 and the diode D1. The 5V voltage divides the voltage through the resistor R6 and the resistor R7 to make the NMOS transistor Q3 in the conducting state, the NMOS transistor Q4 in the cut-off state, the PMOS transistor Q5 in the cut-off state, and the battery BT1 in the cut-off state; when the LED lamp is powered off instantaneously, the 5V disappears to 0, and the MOS transistor Q3 is in the cut-off state;

[0020] At this time, the capacitor C2 limits the current through the resistor R8 to turn on the NMOS transistor Q4, the PMOS transistor Q5 is turned on, and the voltage of the battery BT1 passes through Q5 to the interface OUT. The interface OUT supplies power to the color wheel circuit of the laser module to make the color wheel motor continue to operate for a period of time to ensure the safety of the color wheel fluorescence.

[0021] This time control is calculated according to the formula t = R5C2 * ln[(V21 - V20) / (V21 - V2t)], where V21 represents the final voltage to which the capacitor C2 is discharged, V20 is the voltage across the capacitor C2 before discharging, and V2t is the voltage across the capacitor C2 at time t.

[0022] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A driving and control device for a stage laser lamp, which is used in cooperation with a laser module. Characterized in that, The control device includes a delay closing unit (1), a laser module light source driving unit (2), a laser module power supply auxiliary unit (3) and a power-off power supply unit (4); the output end of the delay closing unit (1) is connected to the input end of the laser module light source driving unit (2), the output end of the laser module light source driving unit (2) is connected to the input end of the laser module, and the output end of the laser module is connected to the input end of the delay closing unit (1); the input end of the delay closing unit (1) is also connected to the input end of the laser module power supply auxiliary unit (3), and the laser module power supply auxiliary unit (3) is connected to the laser module; the output end of the laser module power supply auxiliary unit (3) is also connected to the input end of the laser module through the power-off power supply unit (4); When the LED lamp is powered on, first the laser module power supply auxiliary unit (3) is powered on, and the laser module power supply auxiliary unit (3) supplies power to the laser module color wheel motor control circuit. After the color wheel motor works stably, it will send a feedback signal to the delay closing unit (1) and the laser module power supply auxiliary unit (3). The delay closing unit (1) delays for a period of time through the RC delay circuit to close the switch K and supply power to the laser module light source driving unit (2); The working process of the power-off power supply unit (4) is as follows: when the LED lamp is powered on, a 5V voltage is provided for this circuit, and the 5V voltage charges the capacitor C2 through the resistor R4 and the diode D1. The 5V makes the NMOS transistor Q3 in the conducting state through the voltage division of the resistor R6 and the resistor R7, the NMOS transistor Q4 is in the cut-off state, and the PMOS transistor Q5 is in the cut-off state, and the battery BT1 is in the cut-off state; when the LED lamp is powered off instantaneously, the 5V disappears to 0, and the MOS transistor Q3 is in the cut-off state; At this time, the capacitor C2 opens the NMOS transistor Q4 through the current limiting of the resistor R8, the PMOS transistor Q5 is opened, and the battery BT1 voltage is supplied to the interface OUT through Q5. The interface OUT supplies power to the laser module color wheel circuit to make the color wheel motor continue to operate for a period of time to ensure the safety of the color wheel fluorescence.

2. The driving and control device for a stage laser lamp according to claim 1, Characterized in that, The working process of the delay closing unit (1) is as follows: when receiving the high-level EN signal of the laser module feedback signal, it charges the capacitor C3 through the resistor R1. When the voltage of C3 reaches the turn-on voltage of the NMOS transistor Q1, Q1 conducts. At this time, the gate voltage of the PMOS transistor Q2 decreases, Q2 conducts, and the VCC voltage flows from the source of the PMOS transistor to the gate interface OUT, and the interface OUT is connected to the LED driving board of the laser module.

3. The driving and control device for a stage laser lamp according to claim 2, Characterized in that, Its Q1 turn-on time T follows the formula: T = R1C3 * ln[(V 1 - V 0 ) / (V 1 - V T )], where V 1 represents the voltage that the C3 capacitor finally charges to, V 0 is the voltage across the capacitor C1 before charging; V T is the voltage across the capacitor C1 at time T.

4. The driving and control device for a stage laser lamp according to claim 3, Characterized in that, The Q4 turn-on time control is calculated according to the formula t = R5C2 * ln[(V 12 - V 02 ) / (V 12 - V t2 )], where V 12 represents the final voltage across capacitor C2, V 02 is the voltage across capacitor C2 before discharge, and V t2 is the voltage across capacitor C2 at time t.

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