CN212115753U

CN212115753U - Lighting board and lamp with same

Info

Publication number: CN212115753U
Application number: CN202020226013.1U
Authority: CN
Inventors: 吴喜荣; 李国军
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-12-08
Anticipated expiration: 2030-02-28

Abstract

The utility model discloses a lamp lighting board and lamp with the lamp lighting board, because the fan drive circuit is added in the existing lamp lighting board, the control of the rotating speed of the cooling fan in the lamp can be realized, on one hand, when the lamp is electrified, the cooling fan is started at a smaller fan initial rotating speed, so that the cooling fan does not influence the temperature around the lamp wick, and the lamp can avoid the lamp wick pipe pressure from reaching the rated voltage due to too low temperature and influencing the normal operation of the lamp; 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 utility model belongs to the design field of lamps and lanterns especially relates to a board of lighting a lamp and have lamps and lanterns of lighting a lamp board.

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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a point lamp plate and have lamps and lanterns of point lamp plate can be too high or cross when low at lamps and lanterns voltage, and automatically regulated radiator fan's rotational speed increases or reduces the amount of wind to adjust the voltage of lamps and lanterns, make lamps and lanterns maintain the interior constant power operation of reasonable voltage and electric current, prolong the life of lamps and lanterns.

In order to solve the above problem, the technical scheme of the utility model is that:

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;

the control circuit 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 in real time, and the first PWM circuit controls the output power of the lamp to enable the lamp to keep constant-power operation; the second PWM circuit controls the rotating speed of the cooling fan to adjust the voltage of the lamp.

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 the utility model relates to an embodiment, the output of first PWM circuit real-time supervision lamps and lanterns, when output appears unusually, first PWM circuit adopts PID control technique, reduces output's deviation, adjusts first PWM circuit output first PWM duty cycle.

According to the utility model relates to an embodiment, the signal acquisition circuit still is used for comparing the voltage of gathering with predetermined threshold value, when voltage surpassed predetermined threshold value, the signal acquisition circuit sends control signal for second PWM circuit adjusts the second PWM duty cycle of second PWM circuit output, thereby the adjustment radiator fan's supply voltage, and then the adjustment radiator fan's actual output rotational speed realizes the regulation to lamps and lanterns voltage.

The utility model provides a lamp, includes the utility model discloses a lighting board in the embodiment.

The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:

the utility model relates to an in the embodiment, the spot lamp board can not adjust radiator fan's rotational speed to current lamps and lanterns, because radiator fan operates with rated revolution always, when the voltage of lamps and lanterns appears unusually (too high or cross lowly), can't realize leading to lamps and lanterns to be in non-constant power running state and damage through radiator fan to the regulation of lamps and lanterns voltage. The utility model discloses according to the characteristic that the voltage accessible heat dissipation of lamps and lanterns adjusted, increased the fan drive circuit who is connected with radiator fan electricity on the spot light board, the control circuit of spot light board judges whether to adjust radiator fan's rotational speed through the size of gathering lamps and lanterns voltage, when the voltage is too high, accelerates radiator fan's rotational speed; 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.

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 power adjustment of the lighting board according to an embodiment of the present invention;

fig. 3 is a driving circuit diagram of a cooling fan according to an embodiment of the present invention;

fig. 4 is a schematic diagram of PID algorithm control 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 lighting board and the lamp with the lighting board according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.

Example one

As shown in fig. 1, the lighting board provided by the present invention comprises 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 to enter into the LC filter 2 for filtering noise, so as to reduce the 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 voltage 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 (not 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:

wherein e (t) r (t) -c (t), K_PAs a coefficient of deviation ratio P, T_ITo integrate the time constant, T_DIs 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, the signal acquisition circuit acquires the current and the voltage of the lamp 8 in real time, compares the acquired voltage with a preset threshold value, and when the voltage exceeds the preset threshold value, the signal acquisition circuit sends a control signal to the second PWM circuit and adjusts the duty ratio D of the second PWM circuit₂The 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:

U_fan＝12*D₂，

P＝U_fann/12, wherein U_fanRepresents 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 working process of the lighting panel is briefly introduced as follows:

when the lamp is powered on, the lamp is initialized firstly, the control circuit 7 collects the lighting trigger signal of the lamp 8 and the voltage and the current of the lamp 8 in real time to judge whether the lamp enters a constant-power running state, and meanwhile, the control circuit 7 controls the fan driving circuit 6 to start the cooling fan according to the preset initial fan rotating 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. This board of lighting a lamp is applicable to the stage lamp of taking radiator fan, and the above-mentioned PID algorithm that relates to, radiator fan's rotational speed control method is prior art, the utility model discloses do not relate to the improvement to the aspect of computer program or method, this board of lighting a lamp just can realize with hardware to radiator fan's control.

Example two

The utility model also provides a lamps and lanterns 8 with the spot lamp board of description in the above-mentioned embodiment one, this lamps and lanterns 8 have radiator 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.

To sum up, the utility model provides an igniter board and lamp with the igniter board, owing to increased fan drive circuit 6 in current igniter board, can realize controlling the rotational speed of radiator fan in lamps and lanterns 8, on the one hand, can make lamps and lanterns 8 avoid appearing the wick pipe pressure because of the low temperature can't reach rated voltage, and influence the condition of the normal operating of lamps and lanterns 8; 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, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.

Claims

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 a lamp, and the control circuit is electrically connected with the first DC-DC voltage reduction circuit and the full-bridge inverter circuit;

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 1, wherein the first PWM circuit monitors the output power of the lamps in real time, and when the output power is deviated, the first PWM circuit reduces the deviation of the output power through the PID regulator, and adjusts the first PWM duty ratio outputted from the first PWM circuit.

4. The lighting panel as claimed in claim 1, wherein the signal acquisition circuit is further configured to compare the acquired voltage with a preset threshold, and when the voltage exceeds the preset threshold, the signal acquisition circuit sends a control signal to the second PWM circuit to adjust a second PWM duty ratio output by the second PWM circuit, so as to adjust the power supply voltage of the cooling fan, and further adjust the actual output speed of the cooling fan, thereby adjusting the lamp voltage.

5. A luminaire comprising the ignitor panel of any one of claims 1-4.