CN111315101A - Lighting board and lamp with same - Google Patents

Lighting board and lamp with same Download PDF

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Publication number
CN111315101A
CN111315101A CN202010128956.5A CN202010128956A CN111315101A CN 111315101 A CN111315101 A CN 111315101A CN 202010128956 A CN202010128956 A CN 202010128956A CN 111315101 A CN111315101 A CN 111315101A
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lamp
voltage
circuit
fan
pwm
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吴喜荣
李国军
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Individual
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Abstract

The invention discloses a lighting board and a lamp with the lighting board, wherein a fan driving circuit is added in the existing lighting board, so that the control of the rotating speed of a radiating fan in the lamp can be realized; on the other hand, when the voltage of the lamp is too high or too low, the rotating speed of the cooling fan can be automatically adjusted, so that the voltage of the lamp is adjusted, the lamp is kept in reasonable voltage and current and runs at constant power, and the service life of the lamp is prolonged.

Description

Lighting board and lamp with same
Technical Field
The invention belongs to the field of lamp design, and particularly relates to a lighting board and a lamp with the same.
Background
Any dramatic performance, except for outdoor daylight-time performance, requires stage lighting to provide the light, increasing the enjoyment of the performance by the audience. The stage lamp can provide diversified and regular light, the emotion of audiences can fluctuate along with the change of light colors, and the stage lamp can be closer to the emotion of a plot and a role.
The stage lamp can generate a large amount of heat while providing diversified light, so that the general stage lamp is provided with a cooling fan, and the cooling fan can be turned on when the stage lamp is turned on. The stage lamp ignores the relation between the rotating speed of a cooling fan in the lamp and the lamp voltage, the cooling fan runs at the rated rotating speed all the time after the lamp is electrified, is not controlled by a lighting board, is not related to the voltage of the lamp, and has non-adjustable rotating speed, so that the temperature of the lamp cannot be controlled.
Temperature is extremely important for the lamp, which directly affects the magnitude of the wick pressure. Generally, when the voltage is too low, the current increases to maintain the lamp in a constant power state. However, when the voltage is continuously decreased and the current is increased to a certain value, the current is not increased due to the protection of the circuit elements, so that the lamp enters a non-constant power state, if the rotating speed of the cooling fan cannot be adjusted, the voltage of the lamp cannot be kept, and the lamp can be in a fault or even damaged.
Disclosure of Invention
The invention aims to provide a spot lamp panel and a lamp with the spot lamp panel, which can automatically adjust the rotating speed of a radiating fan and increase or reduce the air volume when the voltage of the lamp is too high or too low, so as to adjust the voltage of the lamp, maintain the lamp to operate at a constant power in reasonable voltage and current and prolong the service life of the lamp.
In order to solve the problems, the technical scheme of the invention is as follows:
a lighting board comprises a direct current power supply, an LC filter, a first DC-DC voltage reduction circuit, a full-bridge inverter circuit, a fan driving circuit, a second DC-DC voltage reduction circuit and a control circuit, wherein the direct current power supply outputs direct current voltage which is filtered by the LC filter and then input into the first DC-DC voltage reduction circuit, the direct current voltage is reduced by the first DC-DC voltage reduction circuit and then input into the full-bridge inverter circuit, the full-bridge inverter circuit outputs alternating current to a lamp, and the control circuit is electrically connected with the first DC-DC voltage reduction circuit and the full-bridge inverter circuit;
the control circuit is also electrically connected with the fan driving circuit and the second DC-DC voltage reduction circuit; the output end of the LC filter is electrically connected with the input end of the second DC-DC voltage reduction circuit, the output end of the second DC-DC voltage reduction circuit is electrically connected with the input end of the fan driving circuit, and the output end of the fan driving circuit is electrically connected with a heat dissipation fan in the lamp;
when the lamp is powered on, the control circuit collects the voltage and the current of the lamp in real time, judges whether the lamp enters a constant-power running state or not, and controls the fan driving circuit to start the cooling fan according to a preset initial rotating speed;
and in the operation of the lamp, the control circuit collects the voltage of the lamp in real time, judges whether the voltage is greater than a preset maximum voltage value or less than a minimum voltage value, and controls the fan driving circuit to adjust the rotating speed of the radiating fan if the voltage is greater than the preset maximum voltage value or less than the preset minimum voltage value, so that the lamp is in a constant-power operation state.
According to an embodiment of the present invention, the DC power source is a DC380V power source; the first DC-DC voltage reduction circuit reduces 380V direct current voltage to direct current voltage within the range of 20V-120V; the second DC-DC voltage reduction circuit reduces the 380V direct current voltage to 12V fixed direct current voltage to supply power to the fan driving circuit.
According to an embodiment of the present invention, the control circuit includes a signal acquisition circuit, a first PWM circuit, and a second PWM circuit; the signal acquisition circuit is used for acquiring the voltage and the current of the lamp in real time, the first PWM circuit controls the output power of the lamp, and the second PWM circuit controls the rotating speed of the cooling fan.
According to an embodiment of the invention, the first PWM circuit monitors the output power of the lamp in real time, and when the output power is abnormal, the first PWM circuit adopts a PID control technology to reduce the deviation of the output power and adjust the first PWM duty ratio output by the first PWM circuit, thereby adjusting the output voltage of the lamp panel.
According to an embodiment of the present invention, the second PWM circuit outputs a second PWM duty cycle D2The rated voltage of the cooling fan is 12V, the rated rotation speed is N r/min, and the actual output rotation speed of the cooling fan can be obtained according to the following formula:
Ufan＝12*D2，
P＝Ufann/12, wherein UfanRepresents the supply voltage of the cooling fan, and P represents the actual output rotation speed of the cooling fan.
A lamp comprises the lighting board in one embodiment of the invention.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) the lighting board in the embodiment of the invention aims at the problem that the existing lamp cannot adjust the rotating speed of the cooling fan, and because the cooling fan always runs at the rated rotating speed, when the voltage of the lamp is abnormal (too high or too low), the voltage of the lamp cannot be adjusted through the cooling fan, so that the lamp is damaged due to the fact that the lamp is in a non-constant power running state. According to the characteristic that the voltage of the lamp can be adjusted through heat dissipation, the fan driving circuit electrically connected with the heat dissipation fan is added on the lighting plate, the control circuit of the lighting plate judges whether the rotating speed of the heat dissipation fan is adjusted or not by collecting the voltage of the lamp, and when the voltage is too high, the rotating speed of the heat dissipation fan is accelerated; when the voltage is too low, the rotating speed of the cooling fan is reduced; therefore, the voltage of the lamp is adjusted, the lamp is kept in reasonable voltage and current and runs at constant power, and the service life of the lamp is prolonged.
2) In the lighting board in the embodiment of the invention, the fan driving circuit electrically connected with the radiating fan is added on the existing lighting board, and the control circuit judges whether the lamp enters a constant power operation state or not by acquiring the output power of the lamp and simultaneously turns on the radiating fan at a smaller initial rotating speed, so that the radiating fan which operates at the smaller rotating speed has no influence on the temperature of the lamp wick in the lamp in the process from the power-on of the lamp to the lighting of the lamp, and the lamp can be smoothly lighted.
Drawings
Fig. 1 is a block diagram of a lighting panel according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a lighting board power adjustment circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a cooling fan driving circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the PID algorithm control in one embodiment of the invention;
fig. 5 is a control flowchart of the lighting panel in an embodiment of the present invention.
Description of reference numerals:
1. a direct current 380V power supply; 2: an LC filter; 3: a first DC-DC voltage reduction circuit; 4: a full-bridge inverter circuit; 5: a second DC-DC voltage reduction circuit; 6: a fan drive circuit; 7: a control circuit; 8: a luminaire.
Detailed Description
The following describes a lighting panel and a lamp with the lighting panel in further detail with reference to the drawings and the embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Example one
As shown in fig. 1, the lighting panel provided by the present invention includes a DC power supply, an LC filter 2, a first DC-DC voltage reduction circuit 3, a full-bridge inverter circuit 4, a fan driving circuit 6, a second DC-DC voltage reduction circuit 5, and a control circuit 7, wherein the DC power supply is a DC380V power supply 1, and 380V DC voltage signals are output and enter the LC filter 2 to filter noise, so as to reduce oscillation of the voltage signals; the 380V direct-current voltage signal after filtering is output in two paths, wherein one path of 380V direct-current voltage signal is input into the first DC-DC voltage reduction circuit 3, the 380V direct-current voltage is reduced to a direct-current voltage signal within the range of 20V-120V, and specifically which value within the range of 20V-120V is selected, and the power requirement of the lamp is determined. The stepped-down direct-current voltage signal is input into the full-bridge inverter circuit 4, and the full-bridge inverter circuit 4 converts the direct-current voltage signal into an alternating-current signal and outputs the alternating-current signal to the lamp 8 for power supply. The control circuit 7 is electrically connected with the first DC-DC voltage reduction circuit 3 and the full-bridge inverter circuit 4, and the voltage reduction of the first DC-DC voltage reduction circuit 3 and the conversion of the direct current of the full-bridge inverter circuit 4 into alternating current are controlled by the control circuit 7.
The other path of the 380V direct-current voltage signal after filtering is input into a second DC-DC voltage reduction circuit 5, and the second DC-DC voltage reduction circuit 5 reduces the 380V direct-current voltage to 12V fixed direct-current voltage and outputs the voltage to a fan driving circuit 6 for power supply. The output end of the fan driving circuit 6 is electrically connected with the heat radiation fan in the lamp 8 to drive the heat radiation fan to operate. The control circuit 7 is also electrically connected to the second DC-DC voltage step-down circuit 5 and the fan drive circuit 6, and both the voltage reduction of the second DC-DC voltage step-down circuit 5 and the command and the rotational speed of the fan drive circuit 6 for driving the heat dissipation fan are controlled by the control circuit 7.
The control circuit 7 comprises a signal acquisition circuit, a first PWM circuit and a second PWM circuit; the signal acquisition circuit is used for acquiring the voltage and the current of the lamp 8 in real time, the first PWM circuit controls the output power of the lamp 8, and the second PWM circuit controls the rotating speed of the cooling fan.
The input voltage of the igniter board is DC380v, a desired output voltage VBUS _ FBK can be obtained after passing through the first DC-DC voltage reduction circuit 3, and a control part of the first DC-DC voltage reduction circuit 3 is shown in fig. 2. The first PWM circuit in the control circuit 7 controls the output MCU _ PWM1H signal to pass through the mos driver chip FAN7380 to control the conduction and shutdown of the mos transistor u1, and then filtered by the LC (T1 and C5) to obtain a stable output voltage VBUS _ FBK, which can be obtained according to the following formula: VBUS _ FBK 380D1Calculation of where D1Is the duty cycle of the MCU _ PWM1H signal, e.g. D1At 10%, the output voltage VBUS _ FBK is 38 v.
The output voltage and the output current of the control circuit 7 are acquired by the AD and then fed back to the single chip microcomputer (shown in the figure), so that the output power of the lighting panel can be obtained, and in order to ensure that the lamp 8 is in a constant-power running state, the duty ratio of the MCU _ PWM1H signal can be automatically controlled by a PID regulator. The PID algorithm control principle is shown in FIG. 4: PID is an abbreviation of proportion, integral and differential, and the PID regulator is a linear regulator which linearly combines the deviation proportion P, integral I and differential D of a given value r (t) and an actual output value c (t) to form a control quantity, and the control quantity is used for controlling a controlled object. The differential equation for the PID regulator is:
Figure BDA0002395276610000051
wherein e (t) r (t) -c (t), KPAs a coefficient of deviation ratio P, TITo integrate the time constant, TDIs the differential time constant.
In the present invention, e (t) represents the power error, i.e. the difference between the target power r (t) and the actual output power c (t). When the output power of the lamp 8 is abnormal, the deviation of the output power can be reduced through the control of the PID regulator, so that the first PWM duty ratio D is adjusted1The output power of the lamp 8 is kept constant.
On the other hand, when the lamp is used8, a second PWM circuit can be adopted to adjust the duty ratio D of the second PWM2The actual output rotation speed of the cooling fan can be controlled. As shown in fig. 3, the second PWM duty cycle D2The signal MCU _ FAN is input into a driving circuit of the cooling FAN, the rated voltage of the cooling FAN is 12V, the rated rotating speed is N r/min, and the actual output rotating speed of the cooling FAN can be obtained according to the following formula:
Ufan＝12*D2，
P＝Ufann/12, wherein UfanRepresents the supply voltage of the radiator fan and P represents the actual output speed of the radiator fan.
It can be seen from the above formula that the actual output rotation speed of the cooling fan is in direct proportion to the power supply voltage of the cooling fan, and therefore, the actual output rotation speed of the cooling fan can be controlled by controlling the power supply voltage of the cooling fan; and the supply voltage and the second PWM duty ratio D of the heat radiation fan2In direct proportion, that is, by adjusting the second PWM duty ratio D2The actual output rotation speed of the heat radiation fan is controlled. How to adjust the second PWM duty cycle D2Adjusting the first PWM duty cycle D1The second PWM duty ratio D is calculated by the PID control technology2Thereby adjusting the second PWM duty D2. Increasing the second PWM duty cycle D when the voltage of the lamp is high2Therefore, the rotating speed of the cooling fan is increased, the cooling of the lamp is accelerated, and the voltage of the lamp is reduced; when the voltage of the lamp is low, the second PWM duty ratio D is reduced2Therefore, the rotating speed of the cooling fan is reduced, the heat dissipation of the lamp is slowed down, the voltage of the lamp is further improved, and the lamp is enabled to establish new balance. Since the establishment of the new equilibrium requires a certain time (about 3 minutes), the adjustment frequency of the radiator fan is also about 3 minutes.
The following briefly introduces the control process of the lighting panel, which is as follows:
as shown in fig. 5, when the lamp is powered on, the lamp is initialized first, the control circuit 7 collects the lighting trigger signal of the lamp 8 and the voltage and current of the lamp 8 in real time to determine whether the lamp enters a constant power operation state, and the control circuit 7 controls the fan driving circuit 6 to turn on the cooling fan according to a preset initial fan rotation speed. The initial fan speed is very low, the influence on the temperature of the lamp wick is very little, the rise of the pressure of the lamp wick tube is not influenced, and the lamp can be smoothly lightened. The control circuit 7 detects the voltage of the lamp 8 in real time, the output power of the lamp 8 is controlled by the first PWM circuit, when the voltage meets the requirement of lighting the lamp 8, a lighting trigger signal is generated, then the lamp 8 is lighted, and the lamp 8 enters a constant-power running state under the control of the first PWM circuit.
In the running process of the lamp, the control circuit 7 collects the tube pressure of the lamp wick in the lamp 8 in real time, and judges whether the tube pressure is greater than a maximum voltage value or less than a minimum voltage value (whether the tube pressure is too high or too low), wherein the maximum voltage value can be set as 100V, and the minimum voltage value can be set as 60V. When the pressure of the lamp wick tube is larger than the maximum voltage value, the control circuit 7 controls the fan driving circuit 6 to carry out PID adjustment on the rotating speed of the fan, and the rotating speed of the cooling fan is accelerated through the output of the second PWM circuit; when the pressure of the lamp wick tube is smaller than the minimum voltage value, the control circuit 7 controls the fan driving circuit 6 to perform PID adjustment on the rotating speed of the fan, and the rotating speed of the cooling fan is reduced through the output of the second PWM circuit. The temperature around the lamp wick is adjusted by adjusting the rotating speed of the cooling fan, the voltage of the lamp wick is further adjusted, and then the output power of the lamp is adjusted and controlled through the first PWM circuit, so that the lamp 8 is kept in reasonable voltage and current and runs at constant power, and the service life of the lamp 8 is prolonged. The lighting board is suitable for a stage lamp with a cooling fan.
Example two
The invention also provides a lamp 8 with the lighting panel described in the first embodiment, and the lamp 8 is provided with a cooling fan. After the lamp 8 is powered on, the heat dissipation fan is started at a low initial fan rotation speed, the influence of the heat dissipation fan on the temperature of the lamp wick is very little, the rise of the pressure of the lamp wick tube is not influenced, and the lamp can be smoothly lightened.
The lamp 8 can also judge whether to adjust the rotating speed of the cooling fan by collecting the pressure of the lamp wick tube, and when the pressure of the lamp wick tube is larger than the maximum voltage value, the rotating speed of the cooling fan can be automatically accelerated; when the pressure of the lamp wick tube is smaller than the minimum voltage value, the rotating speed of the heat radiation fan can be automatically reduced. The temperature around the lamp wick is adjusted by adjusting the rotating speed of the cooling fan, and then the voltage of the lamp wick is adjusted, so that the lamp 8 is kept in reasonable voltage and current and runs at constant power, and the service life of the lamp 8 is prolonged.
In summary, according to the spot lamp panel and the lamp with the spot lamp panel provided by the invention, the fan driving circuit 6 is added in the existing spot lamp panel, so that the rotating speed of the cooling fan in the lamp 8 can be controlled, and on one hand, the lamp 8 can avoid the situation that the normal operation of the lamp 8 is influenced because the lamp wick voltage cannot reach the rated voltage due to too low temperature; on the other hand, when the voltage of the lamp 8 is too high or too low, the rotating speed of the cooling fan can be automatically adjusted, so that the voltage of the lamp 8 is adjusted, the lamp 8 is kept in reasonable voltage and current and runs at constant power, and the service life of the lamp 8 is prolonged.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.

Claims (6)

1. A lighting board is characterized by comprising a direct-current power supply, an LC filter, a first DC-DC voltage reduction circuit, a full-bridge inverter circuit, a fan driving circuit, a second DC-DC voltage reduction circuit and a control circuit, wherein the direct-current power supply outputs direct-current voltage which is filtered by the LC filter and then input into the first DC-DC voltage reduction circuit, the direct-current voltage is reduced by the first DC-DC voltage reduction circuit and then input into the full-bridge inverter circuit, the full-bridge inverter circuit outputs alternating current to supply power to a lamp, and the control circuit is electrically connected with the first DC-DC voltage reduction circuit and the full-bridge inverter circuit;
the control circuit is also electrically connected with the fan driving circuit and the second DC-DC voltage reduction circuit; the output end of the LC filter is electrically connected with the input end of the second DC-DC voltage reduction circuit, the output end of the second DC-DC voltage reduction circuit is electrically connected with the input end of the fan driving circuit, and the output end of the fan driving circuit is electrically connected with a heat dissipation fan in the lamp;
when the lamp is powered on, the control circuit collects the voltage and the current of the lamp in real time, judges whether the lamp enters a constant-power running state or not, and controls the fan driving circuit to start the cooling fan according to a preset initial rotating speed;
and in the operation of the lamp, the control circuit collects the voltage of the lamp in real time, judges whether the voltage is greater than a preset maximum voltage value or less than a minimum voltage value, and controls the fan driving circuit to adjust the rotating speed of the radiating fan if the voltage is greater than the preset maximum voltage value or less than the preset minimum voltage value, so that the lamp is in a constant-power operation state.
2. A lighting panel as recited in claim 1, wherein said direct current power supply is a DC380V power supply; the first DC-DC voltage reduction circuit reduces 380V direct current voltage to direct current voltage within the range of 20V-120V; the second DC-DC voltage reduction circuit reduces the 380V direct current voltage to 12V fixed direct current voltage to supply power to the fan driving circuit.
3. The lighting panel as claimed in claim 2, wherein the control circuit includes a signal acquisition circuit, a first PWM circuit, a second PWM circuit; the signal acquisition circuit is used for acquiring the voltage and the current of the lamp in real time, the first PWM circuit controls the output power of the lamp, and the second PWM circuit controls the rotating speed of the cooling fan.
4. The lighting panel of claim 3, wherein the first PWM circuit monitors the output power of the lamp in real time, and when the output power is abnormal, the first PWM circuit adopts a PID control technology to reduce the deviation of the output power and adjust the first PWM duty ratio output by the first PWM circuit, so as to adjust the output voltage of the lamp.
5. The lighter panel of claim 3, wherein the second PWM circuit outputs a second PWM duty cycle D2The rated voltage of the heat radiation fan is 12V,the rated rotating speed is N r/min, and the actual output rotating speed of the cooling fan can be obtained according to the following formula:
Ufan＝12*D2，
P＝Ufann/12, wherein UfanRepresents the supply voltage of the cooling fan, and P represents the actual output rotation speed of the cooling fan.
6. A luminaire comprising the ignitor panel of any one of claims 1-5.
CN202010128956.5A 2020-02-28 2020-02-28 Lighting board and lamp with same Pending CN111315101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010128956.5A CN111315101A (en) 2020-02-28 2020-02-28 Lighting board and lamp with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010128956.5A CN111315101A (en) 2020-02-28 2020-02-28 Lighting board and lamp with same

Publications (1)

Publication Number Publication Date
CN111315101A true CN111315101A (en) 2020-06-19

Family

ID=71162094

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010128956.5A Pending CN111315101A (en) 2020-02-28 2020-02-28 Lighting board and lamp with same

Country Status (1)

Country Link
CN (1) CN111315101A (en)

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